fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  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_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70
  71 /* Prevent leaks of NFSv4 errors into userland */
  72 int nfs4_map_errors(int err)
  73 {
  74         if (err < -1000) {
  75                 dprintk("%s could not handle NFSv4 error %d\n",
  76                                 __FUNCTION__, -err);
  77                 return -EIO;
  78         }
  79         return err;
  80 }
  81
  82 /*
  83  * This is our standard bitmap for GETATTR requests.
  84  */
  85 const u32 nfs4_fattr_bitmap[2] = {
  86         FATTR4_WORD0_TYPE
  87         | FATTR4_WORD0_CHANGE
  88         | FATTR4_WORD0_SIZE
  89         | FATTR4_WORD0_FSID
  90         | FATTR4_WORD0_FILEID,
  91         FATTR4_WORD1_MODE
  92         | FATTR4_WORD1_NUMLINKS
  93         | FATTR4_WORD1_OWNER
  94         | FATTR4_WORD1_OWNER_GROUP
  95         | FATTR4_WORD1_RAWDEV
  96         | FATTR4_WORD1_SPACE_USED
  97         | FATTR4_WORD1_TIME_ACCESS
  98         | FATTR4_WORD1_TIME_METADATA
  99         | FATTR4_WORD1_TIME_MODIFY
 100 };
 101
 102 const u32 nfs4_statfs_bitmap[2] = {
 103         FATTR4_WORD0_FILES_AVAIL
 104         | FATTR4_WORD0_FILES_FREE
 105         | FATTR4_WORD0_FILES_TOTAL,
 106         FATTR4_WORD1_SPACE_AVAIL
 107         | FATTR4_WORD1_SPACE_FREE
 108         | FATTR4_WORD1_SPACE_TOTAL
 109 };
 110
 111 const u32 nfs4_pathconf_bitmap[2] = {
 112         FATTR4_WORD0_MAXLINK
 113         | FATTR4_WORD0_MAXNAME,
 114         0
 115 };
 116
 117 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 118                         | FATTR4_WORD0_MAXREAD
 119                         | FATTR4_WORD0_MAXWRITE
 120                         | FATTR4_WORD0_LEASE_TIME,
 121                         0
 122 };
 123
 124 const u32 nfs4_fs_locations_bitmap[2] = {
 125         FATTR4_WORD0_TYPE
 126         | FATTR4_WORD0_CHANGE
 127         | FATTR4_WORD0_SIZE
 128         | FATTR4_WORD0_FSID
 129         | FATTR4_WORD0_FILEID
 130         | FATTR4_WORD0_FS_LOCATIONS,
 131         FATTR4_WORD1_MODE
 132         | FATTR4_WORD1_NUMLINKS
 133         | FATTR4_WORD1_OWNER
 134         | FATTR4_WORD1_OWNER_GROUP
 135         | FATTR4_WORD1_RAWDEV
 136         | FATTR4_WORD1_SPACE_USED
 137         | FATTR4_WORD1_TIME_ACCESS
 138         | FATTR4_WORD1_TIME_METADATA
 139         | FATTR4_WORD1_TIME_MODIFY
 140         | FATTR4_WORD1_MOUNTED_ON_FILEID
 141 };
 142
 143 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 144                 struct nfs4_readdir_arg *readdir)
 145 {
 146         __be32 *start, *p;
 147
 148         BUG_ON(readdir->count < 80);
 149         if (cookie > 2) {
 150                 readdir->cookie = cookie;
 151                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 152                 return;
 153         }
 154
 155         readdir->cookie = 0;
 156         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 157         if (cookie == 2)
 158                 return;
 159
 160         /*
 161          * NFSv4 servers do not return entries for '.' and '..'
 162          * Therefore, we fake these entries here.  We let '.'
 163          * have cookie 0 and '..' have cookie 1.  Note that
 164          * when talking to the server, we always send cookie 0
 165          * instead of 1 or 2.
 166          */
 167         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 168
 169         if (cookie == 0) {
 170                 *p++ = xdr_one;                                  /* next */
 171                 *p++ = xdr_zero;                   /* cookie, first word */
 172                 *p++ = xdr_one;                   /* cookie, second word */
 173                 *p++ = xdr_one;                             /* entry len */
 174                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 175                 p++;
 176                 *p++ = xdr_one;                         /* bitmap length */
 177                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 178                 *p++ = htonl(8);              /* attribute buffer length */
 179                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 180         }
 181
 182         *p++ = xdr_one;                                  /* next */
 183         *p++ = xdr_zero;                   /* cookie, first word */
 184         *p++ = xdr_two;                   /* cookie, second word */
 185         *p++ = xdr_two;                             /* entry len */
 186         memcpy(p, "..\0\0", 4);                         /* entry */
 187         p++;
 188         *p++ = xdr_one;                         /* bitmap length */
 189         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 190         *p++ = htonl(8);              /* attribute buffer length */
 191         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 192
 193         readdir->pgbase = (char *)p - (char *)start;
 194         readdir->count -= readdir->pgbase;
 195         kunmap_atomic(start, KM_USER0);
 196 }
 197
 198 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 199 {
 200         struct nfs_client *clp = server->nfs_client;
 201         spin_lock(&clp->cl_lock);
 202         if (time_before(clp->cl_last_renewal,timestamp))
 203                 clp->cl_last_renewal = timestamp;
 204         spin_unlock(&clp->cl_lock);
 205 }
 206
 207 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 208 {
 209         struct nfs_inode *nfsi = NFS_I(dir);
 210
 211         spin_lock(&dir->i_lock);
 212         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 213         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 214                 nfs_force_lookup_revalidate(dir);
 215         nfsi->change_attr = cinfo->after;
 216         spin_unlock(&dir->i_lock);
 217 }
 218
 219 struct nfs4_opendata {
 220         struct kref kref;
 221         struct nfs_openargs o_arg;
 222         struct nfs_openres o_res;
 223         struct nfs_open_confirmargs c_arg;
 224         struct nfs_open_confirmres c_res;
 225         struct nfs_fattr f_attr;
 226         struct nfs_fattr dir_attr;
 227         struct path path;
 228         struct dentry *dir;
 229         struct nfs4_state_owner *owner;
 230         struct nfs4_state *state;
 231         struct iattr attrs;
 232         unsigned long timestamp;
 233         unsigned int rpc_done : 1;
 234         int rpc_status;
 235         int cancelled;
 236 };
 237
 238
 239 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 240 {
 241         p->o_res.f_attr = &p->f_attr;
 242         p->o_res.dir_attr = &p->dir_attr;
 243         p->o_res.seqid = p->o_arg.seqid;
 244         p->c_res.seqid = p->c_arg.seqid;
 245         p->o_res.server = p->o_arg.server;
 246         nfs_fattr_init(&p->f_attr);
 247         nfs_fattr_init(&p->dir_attr);
 248 }
 249
 250 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 251                 struct nfs4_state_owner *sp, int flags,
 252                 const struct iattr *attrs)
 253 {
 254         struct dentry *parent = dget_parent(path->dentry);
 255         struct inode *dir = parent->d_inode;
 256         struct nfs_server *server = NFS_SERVER(dir);
 257         struct nfs4_opendata *p;
 258
 259         p = kzalloc(sizeof(*p), GFP_KERNEL);
 260         if (p == NULL)
 261                 goto err;
 262         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 263         if (p->o_arg.seqid == NULL)
 264                 goto err_free;
 265         p->path.mnt = mntget(path->mnt);
 266         p->path.dentry = dget(path->dentry);
 267         p->dir = parent;
 268         p->owner = sp;
 269         atomic_inc(&sp->so_count);
 270         p->o_arg.fh = NFS_FH(dir);
 271         p->o_arg.open_flags = flags,
 272         p->o_arg.clientid = server->nfs_client->cl_clientid;
 273         p->o_arg.id = sp->so_owner_id.id;
 274         p->o_arg.name = &p->path.dentry->d_name;
 275         p->o_arg.server = server;
 276         p->o_arg.bitmask = server->attr_bitmask;
 277         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 278         if (flags & O_EXCL) {
 279                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 280                 s[0] = jiffies;
 281                 s[1] = current->pid;
 282         } else if (flags & O_CREAT) {
 283                 p->o_arg.u.attrs = &p->attrs;
 284                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 285         }
 286         p->c_arg.fh = &p->o_res.fh;
 287         p->c_arg.stateid = &p->o_res.stateid;
 288         p->c_arg.seqid = p->o_arg.seqid;
 289         nfs4_init_opendata_res(p);
 290         kref_init(&p->kref);
 291         return p;
 292 err_free:
 293         kfree(p);
 294 err:
 295         dput(parent);
 296         return NULL;
 297 }
 298
 299 static void nfs4_opendata_free(struct kref *kref)
 300 {
 301         struct nfs4_opendata *p = container_of(kref,
 302                         struct nfs4_opendata, kref);
 303
 304         nfs_free_seqid(p->o_arg.seqid);
 305         if (p->state != NULL)
 306                 nfs4_put_open_state(p->state);
 307         nfs4_put_state_owner(p->owner);
 308         dput(p->dir);
 309         dput(p->path.dentry);
 310         mntput(p->path.mnt);
 311         kfree(p);
 312 }
 313
 314 static void nfs4_opendata_put(struct nfs4_opendata *p)
 315 {
 316         if (p != NULL)
 317                 kref_put(&p->kref, nfs4_opendata_free);
 318 }
 319
 320 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 321 {
 322         int ret;
 323
 324         ret = rpc_wait_for_completion_task(task);
 325         return ret;
 326 }
 327
 328 static int can_open_cached(struct nfs4_state *state, int mode)
 329 {
 330         int ret = 0;
 331         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 332                 case FMODE_READ:
 333                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         break;
 338                 case FMODE_READ|FMODE_WRITE:
 339                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 340         }
 341         return ret;
 342 }
 343
 344 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 345 {
 346         if ((delegation->type & open_flags) != open_flags)
 347                 return 0;
 348         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 349                 return 0;
 350         return 1;
 351 }
 352
 353 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 354 {
 355         switch (open_flags) {
 356                 case FMODE_WRITE:
 357                         state->n_wronly++;
 358                         break;
 359                 case FMODE_READ:
 360                         state->n_rdonly++;
 361                         break;
 362                 case FMODE_READ|FMODE_WRITE:
 363                         state->n_rdwr++;
 364         }
 365         nfs4_state_set_mode_locked(state, state->state | open_flags);
 366 }
 367
 368 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 369 {
 370         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 371                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 372         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 373         switch (open_flags) {
 374                 case FMODE_READ:
 375                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 376                         break;
 377                 case FMODE_WRITE:
 378                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 379                         break;
 380                 case FMODE_READ|FMODE_WRITE:
 381                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 382         }
 383 }
 384
 385 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 386 {
 387         write_seqlock(&state->seqlock);
 388         nfs_set_open_stateid_locked(state, stateid, open_flags);
 389         write_sequnlock(&state->seqlock);
 390 }
 391
 392 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 393 {
 394         open_flags &= (FMODE_READ|FMODE_WRITE);
 395         /*
 396          * Protect the call to nfs4_state_set_mode_locked and
 397          * serialise the stateid update
 398          */
 399         write_seqlock(&state->seqlock);
 400         if (deleg_stateid != NULL) {
 401                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 402                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 403         }
 404         if (open_stateid != NULL)
 405                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 406         write_sequnlock(&state->seqlock);
 407         spin_lock(&state->owner->so_lock);
 408         update_open_stateflags(state, open_flags);
 409         spin_unlock(&state->owner->so_lock);
 410 }
 411
 412 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 413 {
 414         struct nfs_delegation *delegation;
 415
 416         rcu_read_lock();
 417         delegation = rcu_dereference(NFS_I(inode)->delegation);
 418         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 419                 rcu_read_unlock();
 420                 return;
 421         }
 422         rcu_read_unlock();
 423         nfs_inode_return_delegation(inode);
 424 }
 425
 426 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 427 {
 428         struct nfs4_state *state = opendata->state;
 429         struct nfs_inode *nfsi = NFS_I(state->inode);
 430         struct nfs_delegation *delegation;
 431         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 432         nfs4_stateid stateid;
 433         int ret = -EAGAIN;
 434
 435         rcu_read_lock();
 436         delegation = rcu_dereference(nfsi->delegation);
 437         for (;;) {
 438                 if (can_open_cached(state, open_mode)) {
 439                         spin_lock(&state->owner->so_lock);
 440                         if (can_open_cached(state, open_mode)) {
 441                                 update_open_stateflags(state, open_mode);
 442                                 spin_unlock(&state->owner->so_lock);
 443                                 rcu_read_unlock();
 444                                 goto out_return_state;
 445                         }
 446                         spin_unlock(&state->owner->so_lock);
 447                 }
 448                 if (delegation == NULL)
 449                         break;
 450                 if (!can_open_delegated(delegation, open_mode))
 451                         break;
 452                 /* Save the delegation */
 453                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 454                 rcu_read_unlock();
 455                 lock_kernel();
 456                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 457                 unlock_kernel();
 458                 if (ret != 0)
 459                         goto out;
 460                 ret = -EAGAIN;
 461                 rcu_read_lock();
 462                 delegation = rcu_dereference(nfsi->delegation);
 463                 /* If no delegation, try a cached open */
 464                 if (delegation == NULL)
 465                         continue;
 466                 /* Is the delegation still valid? */
 467                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 468                         continue;
 469                 rcu_read_unlock();
 470                 update_open_stateid(state, NULL, &stateid, open_mode);
 471                 goto out_return_state;
 472         }
 473         rcu_read_unlock();
 474 out:
 475         return ERR_PTR(ret);
 476 out_return_state:
 477         atomic_inc(&state->count);
 478         return state;
 479 }
 480
 481 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 482 {
 483         struct inode *inode;
 484         struct nfs4_state *state = NULL;
 485         struct nfs_delegation *delegation;
 486         nfs4_stateid *deleg_stateid = NULL;
 487         int ret;
 488
 489         if (!data->rpc_done) {
 490                 state = nfs4_try_open_cached(data);
 491                 goto out;
 492         }
 493
 494         ret = -EAGAIN;
 495         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 496                 goto err;
 497         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 498         ret = PTR_ERR(inode);
 499         if (IS_ERR(inode))
 500                 goto err;
 501         ret = -ENOMEM;
 502         state = nfs4_get_open_state(inode, data->owner);
 503         if (state == NULL)
 504                 goto err_put_inode;
 505         if (data->o_res.delegation_type != 0) {
 506                 int delegation_flags = 0;
 507
 508                 rcu_read_lock();
 509                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 510                 if (delegation)
 511                         delegation_flags = delegation->flags;
 512                 rcu_read_unlock();
 513                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 514                         nfs_inode_set_delegation(state->inode,
 515                                         data->owner->so_cred,
 516                                         &data->o_res);
 517                 else
 518                         nfs_inode_reclaim_delegation(state->inode,
 519                                         data->owner->so_cred,
 520                                         &data->o_res);
 521         }
 522         rcu_read_lock();
 523         delegation = rcu_dereference(NFS_I(inode)->delegation);
 524         if (delegation != NULL)
 525                 deleg_stateid = &delegation->stateid;
 526         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 527         rcu_read_unlock();
 528         iput(inode);
 529 out:
 530         return state;
 531 err_put_inode:
 532         iput(inode);
 533 err:
 534         return ERR_PTR(ret);
 535 }
 536
 537 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 538 {
 539         struct nfs_inode *nfsi = NFS_I(state->inode);
 540         struct nfs_open_context *ctx;
 541
 542         spin_lock(&state->inode->i_lock);
 543         list_for_each_entry(ctx, &nfsi->open_files, list) {
 544                 if (ctx->state != state)
 545                         continue;
 546                 get_nfs_open_context(ctx);
 547                 spin_unlock(&state->inode->i_lock);
 548                 return ctx;
 549         }
 550         spin_unlock(&state->inode->i_lock);
 551         return ERR_PTR(-ENOENT);
 552 }
 553
 554 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 555 {
 556         struct nfs4_opendata *opendata;
 557
 558         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 559         if (opendata == NULL)
 560                 return ERR_PTR(-ENOMEM);
 561         opendata->state = state;
 562         atomic_inc(&state->count);
 563         return opendata;
 564 }
 565
 566 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 567 {
 568         struct nfs4_state *newstate;
 569         int ret;
 570
 571         opendata->o_arg.open_flags = openflags;
 572         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 573         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 574         nfs4_init_opendata_res(opendata);
 575         ret = _nfs4_proc_open(opendata);
 576         if (ret != 0)
 577                 return ret;
 578         newstate = nfs4_opendata_to_nfs4_state(opendata);
 579         if (IS_ERR(newstate))
 580                 return PTR_ERR(newstate);
 581         nfs4_close_state(&opendata->path, newstate, openflags);
 582         *res = newstate;
 583         return 0;
 584 }
 585
 586 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 587 {
 588         struct nfs4_state *newstate;
 589         int ret;
 590
 591         /* memory barrier prior to reading state->n_* */
 592         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 593         smp_rmb();
 594         if (state->n_rdwr != 0) {
 595                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 596                 if (ret != 0)
 597                         return ret;
 598                 if (newstate != state)
 599                         return -ESTALE;
 600         }
 601         if (state->n_wronly != 0) {
 602                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 603                 if (ret != 0)
 604                         return ret;
 605                 if (newstate != state)
 606                         return -ESTALE;
 607         }
 608         if (state->n_rdonly != 0) {
 609                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 610                 if (ret != 0)
 611                         return ret;
 612                 if (newstate != state)
 613                         return -ESTALE;
 614         }
 615         /*
 616          * We may have performed cached opens for all three recoveries.
 617          * Check if we need to update the current stateid.
 618          */
 619         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 620             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 621                 write_seqlock(&state->seqlock);
 622                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 623                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 624                 write_sequnlock(&state->seqlock);
 625         }
 626         return 0;
 627 }
 628
 629 /*
 630  * OPEN_RECLAIM:
 631  *      reclaim state on the server after a reboot.
 632  */
 633 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 634 {
 635         struct nfs_delegation *delegation;
 636         struct nfs4_opendata *opendata;
 637         int delegation_type = 0;
 638         int status;
 639
 640         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 641         if (IS_ERR(opendata))
 642                 return PTR_ERR(opendata);
 643         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 644         opendata->o_arg.fh = NFS_FH(state->inode);
 645         rcu_read_lock();
 646         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 647         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 648                 delegation_type = delegation->type;
 649         rcu_read_unlock();
 650         opendata->o_arg.u.delegation_type = delegation_type;
 651         status = nfs4_open_recover(opendata, state);
 652         nfs4_opendata_put(opendata);
 653         return status;
 654 }
 655
 656 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 657 {
 658         struct nfs_server *server = NFS_SERVER(state->inode);
 659         struct nfs4_exception exception = { };
 660         int err;
 661         do {
 662                 err = _nfs4_do_open_reclaim(ctx, state);
 663                 if (err != -NFS4ERR_DELAY)
 664                         break;
 665                 nfs4_handle_exception(server, err, &exception);
 666         } while (exception.retry);
 667         return err;
 668 }
 669
 670 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 671 {
 672         struct nfs_open_context *ctx;
 673         int ret;
 674
 675         ctx = nfs4_state_find_open_context(state);
 676         if (IS_ERR(ctx))
 677                 return PTR_ERR(ctx);
 678         ret = nfs4_do_open_reclaim(ctx, state);
 679         put_nfs_open_context(ctx);
 680         return ret;
 681 }
 682
 683 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 684 {
 685         struct nfs4_opendata *opendata;
 686         int ret;
 687
 688         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 689         if (IS_ERR(opendata))
 690                 return PTR_ERR(opendata);
 691         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 692         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 693                         sizeof(opendata->o_arg.u.delegation.data));
 694         ret = nfs4_open_recover(opendata, state);
 695         nfs4_opendata_put(opendata);
 696         return ret;
 697 }
 698
 699 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 700 {
 701         struct nfs4_exception exception = { };
 702         struct nfs_server *server = NFS_SERVER(state->inode);
 703         int err;
 704         do {
 705                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 706                 switch (err) {
 707                         case 0:
 708                                 return err;
 709                         case -NFS4ERR_STALE_CLIENTID:
 710                         case -NFS4ERR_STALE_STATEID:
 711                         case -NFS4ERR_EXPIRED:
 712                                 /* Don't recall a delegation if it was lost */
 713                                 nfs4_schedule_state_recovery(server->nfs_client);
 714                                 return err;
 715                 }
 716                 err = nfs4_handle_exception(server, err, &exception);
 717         } while (exception.retry);
 718         return err;
 719 }
 720
 721 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 722 {
 723         struct nfs4_opendata *data = calldata;
 724
 725         data->rpc_status = task->tk_status;
 726         if (RPC_ASSASSINATED(task))
 727                 return;
 728         if (data->rpc_status == 0) {
 729                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 730                                 sizeof(data->o_res.stateid.data));
 731                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 732                 renew_lease(data->o_res.server, data->timestamp);
 733                 data->rpc_done = 1;
 734         }
 735 }
 736
 737 static void nfs4_open_confirm_release(void *calldata)
 738 {
 739         struct nfs4_opendata *data = calldata;
 740         struct nfs4_state *state = NULL;
 741
 742         /* If this request hasn't been cancelled, do nothing */
 743         if (data->cancelled == 0)
 744                 goto out_free;
 745         /* In case of error, no cleanup! */
 746         if (!data->rpc_done)
 747                 goto out_free;
 748         state = nfs4_opendata_to_nfs4_state(data);
 749         if (!IS_ERR(state))
 750                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 751 out_free:
 752         nfs4_opendata_put(data);
 753 }
 754
 755 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 756         .rpc_call_done = nfs4_open_confirm_done,
 757         .rpc_release = nfs4_open_confirm_release,
 758 };
 759
 760 /*
 761  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 762  */
 763 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 764 {
 765         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 766         struct rpc_task *task;
 767         struct  rpc_message msg = {
 768                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 769                 .rpc_argp = &data->c_arg,
 770                 .rpc_resp = &data->c_res,
 771                 .rpc_cred = data->owner->so_cred,
 772         };
 773         struct rpc_task_setup task_setup_data = {
 774                 .rpc_client = server->client,
 775                 .rpc_message = &msg,
 776                 .callback_ops = &nfs4_open_confirm_ops,
 777                 .callback_data = data,
 778                 .workqueue = nfsiod_workqueue,
 779                 .flags = RPC_TASK_ASYNC,
 780         };
 781         int status;
 782
 783         kref_get(&data->kref);
 784         data->rpc_done = 0;
 785         data->rpc_status = 0;
 786         data->timestamp = jiffies;
 787         task = rpc_run_task(&task_setup_data);
 788         if (IS_ERR(task))
 789                 return PTR_ERR(task);
 790         status = nfs4_wait_for_completion_rpc_task(task);
 791         if (status != 0) {
 792                 data->cancelled = 1;
 793                 smp_wmb();
 794         } else
 795                 status = data->rpc_status;
 796         rpc_put_task(task);
 797         return status;
 798 }
 799
 800 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 801 {
 802         struct nfs4_opendata *data = calldata;
 803         struct nfs4_state_owner *sp = data->owner;
 804
 805         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 806                 return;
 807         /*
 808          * Check if we still need to send an OPEN call, or if we can use
 809          * a delegation instead.
 810          */
 811         if (data->state != NULL) {
 812                 struct nfs_delegation *delegation;
 813
 814                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 815                         goto out_no_action;
 816                 rcu_read_lock();
 817                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 818                 if (delegation != NULL &&
 819                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 820                         rcu_read_unlock();
 821                         goto out_no_action;
 822                 }
 823                 rcu_read_unlock();
 824         }
 825         /* Update sequence id. */
 826         data->o_arg.id = sp->so_owner_id.id;
 827         data->o_arg.clientid = sp->so_client->cl_clientid;
 828         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 829                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 830                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 831         }
 832         data->timestamp = jiffies;
 833         rpc_call_start(task);
 834         return;
 835 out_no_action:
 836         task->tk_action = NULL;
 837
 838 }
 839
 840 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 841 {
 842         struct nfs4_opendata *data = calldata;
 843
 844         data->rpc_status = task->tk_status;
 845         if (RPC_ASSASSINATED(task))
 846                 return;
 847         if (task->tk_status == 0) {
 848                 switch (data->o_res.f_attr->mode & S_IFMT) {
 849                         case S_IFREG:
 850                                 break;
 851                         case S_IFLNK:
 852                                 data->rpc_status = -ELOOP;
 853                                 break;
 854                         case S_IFDIR:
 855                                 data->rpc_status = -EISDIR;
 856                                 break;
 857                         default:
 858                                 data->rpc_status = -ENOTDIR;
 859                 }
 860                 renew_lease(data->o_res.server, data->timestamp);
 861                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 862                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 863         }
 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         state = nfs4_opendata_to_nfs4_state(data);
 882         if (!IS_ERR(state))
 883                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 884 out_free:
 885         nfs4_opendata_put(data);
 886 }
 887
 888 static const struct rpc_call_ops nfs4_open_ops = {
 889         .rpc_call_prepare = nfs4_open_prepare,
 890         .rpc_call_done = nfs4_open_done,
 891         .rpc_release = nfs4_open_release,
 892 };
 893
 894 /*
 895  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 896  */
 897 static int _nfs4_proc_open(struct nfs4_opendata *data)
 898 {
 899         struct inode *dir = data->dir->d_inode;
 900         struct nfs_server *server = NFS_SERVER(dir);
 901         struct nfs_openargs *o_arg = &data->o_arg;
 902         struct nfs_openres *o_res = &data->o_res;
 903         struct rpc_task *task;
 904         struct rpc_message msg = {
 905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 906                 .rpc_argp = o_arg,
 907                 .rpc_resp = o_res,
 908                 .rpc_cred = data->owner->so_cred,
 909         };
 910         struct rpc_task_setup task_setup_data = {
 911                 .rpc_client = server->client,
 912                 .rpc_message = &msg,
 913                 .callback_ops = &nfs4_open_ops,
 914                 .callback_data = data,
 915                 .workqueue = nfsiod_workqueue,
 916                 .flags = RPC_TASK_ASYNC,
 917         };
 918         int status;
 919
 920         kref_get(&data->kref);
 921         data->rpc_done = 0;
 922         data->rpc_status = 0;
 923         data->cancelled = 0;
 924         task = rpc_run_task(&task_setup_data);
 925         if (IS_ERR(task))
 926                 return PTR_ERR(task);
 927         status = nfs4_wait_for_completion_rpc_task(task);
 928         if (status != 0) {
 929                 data->cancelled = 1;
 930                 smp_wmb();
 931         } else
 932                 status = data->rpc_status;
 933         rpc_put_task(task);
 934         if (status != 0 || !data->rpc_done)
 935                 return status;
 936
 937         if (o_res->fh.size == 0)
 938                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 939
 940         if (o_arg->open_flags & O_CREAT) {
 941                 update_changeattr(dir, &o_res->cinfo);
 942                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 943         } else
 944                 nfs_refresh_inode(dir, o_res->dir_attr);
 945         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 946                 status = _nfs4_proc_open_confirm(data);
 947                 if (status != 0)
 948                         return status;
 949         }
 950         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 951                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 952         return 0;
 953 }
 954
 955 static int nfs4_recover_expired_lease(struct nfs_server *server)
 956 {
 957         struct nfs_client *clp = server->nfs_client;
 958         int ret;
 959
 960         for (;;) {
 961                 ret = nfs4_wait_clnt_recover(server->client, clp);
 962                 if (ret != 0)
 963                         return ret;
 964                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 965                         break;
 966                 nfs4_schedule_state_recovery(clp);
 967         }
 968         return 0;
 969 }
 970
 971 /*
 972  * OPEN_EXPIRED:
 973  *      reclaim state on the server after a network partition.
 974  *      Assumes caller holds the appropriate lock
 975  */
 976 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 977 {
 978         struct nfs4_opendata *opendata;
 979         int ret;
 980
 981         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 982         if (IS_ERR(opendata))
 983                 return PTR_ERR(opendata);
 984         ret = nfs4_open_recover(opendata, state);
 985         if (ret == -ESTALE)
 986                 d_drop(ctx->path.dentry);
 987         nfs4_opendata_put(opendata);
 988         return ret;
 989 }
 990
 991 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 992 {
 993         struct nfs_server *server = NFS_SERVER(state->inode);
 994         struct nfs4_exception exception = { };
 995         int err;
 996
 997         do {
 998                 err = _nfs4_open_expired(ctx, state);
 999                 if (err == -NFS4ERR_DELAY)
1000                         nfs4_handle_exception(server, err, &exception);
1001         } while (exception.retry);
1002         return err;
1003 }
1004
1005 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1006 {
1007         struct nfs_open_context *ctx;
1008         int ret;
1009
1010         ctx = nfs4_state_find_open_context(state);
1011         if (IS_ERR(ctx))
1012                 return PTR_ERR(ctx);
1013         ret = nfs4_do_open_expired(ctx, state);
1014         put_nfs_open_context(ctx);
1015         return ret;
1016 }
1017
1018 /*
1019  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1020  * fields corresponding to attributes that were used to store the verifier.
1021  * Make sure we clobber those fields in the later setattr call
1022  */
1023 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1024 {
1025         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1026             !(sattr->ia_valid & ATTR_ATIME_SET))
1027                 sattr->ia_valid |= ATTR_ATIME;
1028
1029         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1030             !(sattr->ia_valid & ATTR_MTIME_SET))
1031                 sattr->ia_valid |= ATTR_MTIME;
1032 }
1033
1034 /*
1035  * Returns a referenced nfs4_state
1036  */
1037 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1038 {
1039         struct nfs4_state_owner  *sp;
1040         struct nfs4_state     *state = NULL;
1041         struct nfs_server       *server = NFS_SERVER(dir);
1042         struct nfs_client *clp = server->nfs_client;
1043         struct nfs4_opendata *opendata;
1044         int status;
1045
1046         /* Protect against reboot recovery conflicts */
1047         status = -ENOMEM;
1048         if (!(sp = nfs4_get_state_owner(server, cred))) {
1049                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1050                 goto out_err;
1051         }
1052         status = nfs4_recover_expired_lease(server);
1053         if (status != 0)
1054                 goto err_put_state_owner;
1055         if (path->dentry->d_inode != NULL)
1056                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1057         down_read(&clp->cl_sem);
1058         status = -ENOMEM;
1059         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1060         if (opendata == NULL)
1061                 goto err_release_rwsem;
1062
1063         if (path->dentry->d_inode != NULL)
1064                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1065
1066         status = _nfs4_proc_open(opendata);
1067         if (status != 0)
1068                 goto err_opendata_put;
1069
1070         if (opendata->o_arg.open_flags & O_EXCL)
1071                 nfs4_exclusive_attrset(opendata, sattr);
1072
1073         state = nfs4_opendata_to_nfs4_state(opendata);
1074         status = PTR_ERR(state);
1075         if (IS_ERR(state))
1076                 goto err_opendata_put;
1077         nfs4_opendata_put(opendata);
1078         nfs4_put_state_owner(sp);
1079         up_read(&clp->cl_sem);
1080         *res = state;
1081         return 0;
1082 err_opendata_put:
1083         nfs4_opendata_put(opendata);
1084 err_release_rwsem:
1085         up_read(&clp->cl_sem);
1086 err_put_state_owner:
1087         nfs4_put_state_owner(sp);
1088 out_err:
1089         *res = NULL;
1090         return status;
1091 }
1092
1093
1094 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1095 {
1096         struct nfs4_exception exception = { };
1097         struct nfs4_state *res;
1098         int status;
1099
1100         do {
1101                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1102                 if (status == 0)
1103                         break;
1104                 /* NOTE: BAD_SEQID means the server and client disagree about the
1105                  * book-keeping w.r.t. state-changing operations
1106                  * (OPEN/CLOSE/LOCK/LOCKU...)
1107                  * It is actually a sign of a bug on the client or on the server.
1108                  *
1109                  * If we receive a BAD_SEQID error in the particular case of
1110                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1111                  * have unhashed the old state_owner for us, and that we can
1112                  * therefore safely retry using a new one. We should still warn
1113                  * the user though...
1114                  */
1115                 if (status == -NFS4ERR_BAD_SEQID) {
1116                         printk(KERN_WARNING "NFS: v4 server %s "
1117                                         " returned a bad sequence-id error!\n",
1118                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1119                         exception.retry = 1;
1120                         continue;
1121                 }
1122                 /*
1123                  * BAD_STATEID on OPEN means that the server cancelled our
1124                  * state before it received the OPEN_CONFIRM.
1125                  * Recover by retrying the request as per the discussion
1126                  * on Page 181 of RFC3530.
1127                  */
1128                 if (status == -NFS4ERR_BAD_STATEID) {
1129                         exception.retry = 1;
1130                         continue;
1131                 }
1132                 if (status == -EAGAIN) {
1133                         /* We must have found a delegation */
1134                         exception.retry = 1;
1135                         continue;
1136                 }
1137                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1138                                         status, &exception));
1139         } while (exception.retry);
1140         return res;
1141 }
1142
1143 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1144                 struct iattr *sattr, struct nfs4_state *state)
1145 {
1146         struct nfs_server *server = NFS_SERVER(inode);
1147         struct nfs_setattrargs  arg = {
1148                 .fh             = NFS_FH(inode),
1149                 .iap            = sattr,
1150                 .server         = server,
1151                 .bitmask = server->attr_bitmask,
1152         };
1153         struct nfs_setattrres  res = {
1154                 .fattr          = fattr,
1155                 .server         = server,
1156         };
1157         struct rpc_message msg = {
1158                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1159                 .rpc_argp       = &arg,
1160                 .rpc_resp       = &res,
1161         };
1162         unsigned long timestamp = jiffies;
1163         int status;
1164
1165         nfs_fattr_init(fattr);
1166
1167         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1168                 /* Use that stateid */
1169         } else if (state != NULL) {
1170                 msg.rpc_cred = state->owner->so_cred;
1171                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1172         } else
1173                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1174
1175         status = rpc_call_sync(server->client, &msg, 0);
1176         if (status == 0 && state != NULL)
1177                 renew_lease(server, timestamp);
1178         return status;
1179 }
1180
1181 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1182                 struct iattr *sattr, struct nfs4_state *state)
1183 {
1184         struct nfs_server *server = NFS_SERVER(inode);
1185         struct nfs4_exception exception = { };
1186         int err;
1187         do {
1188                 err = nfs4_handle_exception(server,
1189                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1190                                 &exception);
1191         } while (exception.retry);
1192         return err;
1193 }
1194
1195 struct nfs4_closedata {
1196         struct path path;
1197         struct inode *inode;
1198         struct nfs4_state *state;
1199         struct nfs_closeargs arg;
1200         struct nfs_closeres res;
1201         struct nfs_fattr fattr;
1202         unsigned long timestamp;
1203 };
1204
1205 static void nfs4_free_closedata(void *data)
1206 {
1207         struct nfs4_closedata *calldata = data;
1208         struct nfs4_state_owner *sp = calldata->state->owner;
1209
1210         nfs4_put_open_state(calldata->state);
1211         nfs_free_seqid(calldata->arg.seqid);
1212         nfs4_put_state_owner(sp);
1213         dput(calldata->path.dentry);
1214         mntput(calldata->path.mnt);
1215         kfree(calldata);
1216 }
1217
1218 static void nfs4_close_done(struct rpc_task *task, void *data)
1219 {
1220         struct nfs4_closedata *calldata = data;
1221         struct nfs4_state *state = calldata->state;
1222         struct nfs_server *server = NFS_SERVER(calldata->inode);
1223
1224         if (RPC_ASSASSINATED(task))
1225                 return;
1226         /* hmm. we are done with the inode, and in the process of freeing
1227          * the state_owner. we keep this around to process errors
1228          */
1229         switch (task->tk_status) {
1230                 case 0:
1231                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1232                         renew_lease(server, calldata->timestamp);
1233                         break;
1234                 case -NFS4ERR_STALE_STATEID:
1235                 case -NFS4ERR_EXPIRED:
1236                         break;
1237                 default:
1238                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1239                                 rpc_restart_call(task);
1240                                 return;
1241                         }
1242         }
1243         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1244 }
1245
1246 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1247 {
1248         struct nfs4_closedata *calldata = data;
1249         struct nfs4_state *state = calldata->state;
1250         int clear_rd, clear_wr, clear_rdwr;
1251
1252         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1253                 return;
1254
1255         clear_rd = clear_wr = clear_rdwr = 0;
1256         spin_lock(&state->owner->so_lock);
1257         /* Calculate the change in open mode */
1258         if (state->n_rdwr == 0) {
1259                 if (state->n_rdonly == 0) {
1260                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1261                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1262                 }
1263                 if (state->n_wronly == 0) {
1264                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1265                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1266                 }
1267         }
1268         spin_unlock(&state->owner->so_lock);
1269         if (!clear_rd && !clear_wr && !clear_rdwr) {
1270                 /* Note: exit _without_ calling nfs4_close_done */
1271                 task->tk_action = NULL;
1272                 return;
1273         }
1274         nfs_fattr_init(calldata->res.fattr);
1275         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1276                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1277                 calldata->arg.open_flags = FMODE_READ;
1278         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1279                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1280                 calldata->arg.open_flags = FMODE_WRITE;
1281         }
1282         calldata->timestamp = jiffies;
1283         rpc_call_start(task);
1284 }
1285
1286 static const struct rpc_call_ops nfs4_close_ops = {
1287         .rpc_call_prepare = nfs4_close_prepare,
1288         .rpc_call_done = nfs4_close_done,
1289         .rpc_release = nfs4_free_closedata,
1290 };
1291
1292 /*
1293  * It is possible for data to be read/written from a mem-mapped file
1294  * after the sys_close call (which hits the vfs layer as a flush).
1295  * This means that we can't safely call nfsv4 close on a file until
1296  * the inode is cleared. This in turn means that we are not good
1297  * NFSv4 citizens - we do not indicate to the server to update the file's
1298  * share state even when we are done with one of the three share
1299  * stateid's in the inode.
1300  *
1301  * NOTE: Caller must be holding the sp->so_owner semaphore!
1302  */
1303 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1304 {
1305         struct nfs_server *server = NFS_SERVER(state->inode);
1306         struct nfs4_closedata *calldata;
1307         struct nfs4_state_owner *sp = state->owner;
1308         struct rpc_task *task;
1309         struct rpc_message msg = {
1310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1311                 .rpc_cred = state->owner->so_cred,
1312         };
1313         struct rpc_task_setup task_setup_data = {
1314                 .rpc_client = server->client,
1315                 .rpc_message = &msg,
1316                 .callback_ops = &nfs4_close_ops,
1317                 .workqueue = nfsiod_workqueue,
1318                 .flags = RPC_TASK_ASYNC,
1319         };
1320         int status = -ENOMEM;
1321
1322         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1323         if (calldata == NULL)
1324                 goto out;
1325         calldata->inode = state->inode;
1326         calldata->state = state;
1327         calldata->arg.fh = NFS_FH(state->inode);
1328         calldata->arg.stateid = &state->open_stateid;
1329         /* Serialization for the sequence id */
1330         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1331         if (calldata->arg.seqid == NULL)
1332                 goto out_free_calldata;
1333         calldata->arg.bitmask = server->attr_bitmask;
1334         calldata->res.fattr = &calldata->fattr;
1335         calldata->res.seqid = calldata->arg.seqid;
1336         calldata->res.server = server;
1337         calldata->path.mnt = mntget(path->mnt);
1338         calldata->path.dentry = dget(path->dentry);
1339
1340         msg.rpc_argp = &calldata->arg,
1341         msg.rpc_resp = &calldata->res,
1342         task_setup_data.callback_data = calldata;
1343         task = rpc_run_task(&task_setup_data);
1344         if (IS_ERR(task))
1345                 return PTR_ERR(task);
1346         status = 0;
1347         if (wait)
1348                 status = rpc_wait_for_completion_task(task);
1349         rpc_put_task(task);
1350         return status;
1351 out_free_calldata:
1352         kfree(calldata);
1353 out:
1354         nfs4_put_open_state(state);
1355         nfs4_put_state_owner(sp);
1356         return status;
1357 }
1358
1359 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1360 {
1361         struct file *filp;
1362         int ret;
1363
1364         /* If the open_intent is for execute, we have an extra check to make */
1365         if (nd->intent.open.flags & FMODE_EXEC) {
1366                 ret = nfs_may_open(state->inode,
1367                                 state->owner->so_cred,
1368                                 nd->intent.open.flags);
1369                 if (ret < 0)
1370                         goto out_close;
1371         }
1372         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1373         if (!IS_ERR(filp)) {
1374                 struct nfs_open_context *ctx;
1375                 ctx = nfs_file_open_context(filp);
1376                 ctx->state = state;
1377                 return 0;
1378         }
1379         ret = PTR_ERR(filp);
1380 out_close:
1381         nfs4_close_sync(path, state, nd->intent.open.flags);
1382         return ret;
1383 }
1384
1385 struct dentry *
1386 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1387 {
1388         struct path path = {
1389                 .mnt = nd->path.mnt,
1390                 .dentry = dentry,
1391         };
1392         struct dentry *parent;
1393         struct iattr attr;
1394         struct rpc_cred *cred;
1395         struct nfs4_state *state;
1396         struct dentry *res;
1397
1398         if (nd->flags & LOOKUP_CREATE) {
1399                 attr.ia_mode = nd->intent.open.create_mode;
1400                 attr.ia_valid = ATTR_MODE;
1401                 if (!IS_POSIXACL(dir))
1402                         attr.ia_mode &= ~current->fs->umask;
1403         } else {
1404                 attr.ia_valid = 0;
1405                 BUG_ON(nd->intent.open.flags & O_CREAT);
1406         }
1407
1408         cred = rpc_lookup_cred();
1409         if (IS_ERR(cred))
1410                 return (struct dentry *)cred;
1411         parent = dentry->d_parent;
1412         /* Protect against concurrent sillydeletes */
1413         nfs_block_sillyrename(parent);
1414         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1415         put_rpccred(cred);
1416         if (IS_ERR(state)) {
1417                 if (PTR_ERR(state) == -ENOENT) {
1418                         d_add(dentry, NULL);
1419                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1420                 }
1421                 nfs_unblock_sillyrename(parent);
1422                 return (struct dentry *)state;
1423         }
1424         res = d_add_unique(dentry, igrab(state->inode));
1425         if (res != NULL)
1426                 path.dentry = res;
1427         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1428         nfs_unblock_sillyrename(parent);
1429         nfs4_intent_set_file(nd, &path, state);
1430         return res;
1431 }
1432
1433 int
1434 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1435 {
1436         struct path path = {
1437                 .mnt = nd->path.mnt,
1438                 .dentry = dentry,
1439         };
1440         struct rpc_cred *cred;
1441         struct nfs4_state *state;
1442
1443         cred = rpc_lookup_cred();
1444         if (IS_ERR(cred))
1445                 return PTR_ERR(cred);
1446         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1447         put_rpccred(cred);
1448         if (IS_ERR(state)) {
1449                 switch (PTR_ERR(state)) {
1450                         case -EPERM:
1451                         case -EACCES:
1452                         case -EDQUOT:
1453                         case -ENOSPC:
1454                         case -EROFS:
1455                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1456                                 return 1;
1457                         default:
1458                                 goto out_drop;
1459                 }
1460         }
1461         if (state->inode == dentry->d_inode) {
1462                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1463                 nfs4_intent_set_file(nd, &path, state);
1464                 return 1;
1465         }
1466         nfs4_close_sync(&path, state, openflags);
1467 out_drop:
1468         d_drop(dentry);
1469         return 0;
1470 }
1471
1472
1473 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1474 {
1475         struct nfs4_server_caps_res res = {};
1476         struct rpc_message msg = {
1477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1478                 .rpc_argp = fhandle,
1479                 .rpc_resp = &res,
1480         };
1481         int status;
1482
1483         status = rpc_call_sync(server->client, &msg, 0);
1484         if (status == 0) {
1485                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1486                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1487                         server->caps |= NFS_CAP_ACLS;
1488                 if (res.has_links != 0)
1489                         server->caps |= NFS_CAP_HARDLINKS;
1490                 if (res.has_symlinks != 0)
1491                         server->caps |= NFS_CAP_SYMLINKS;
1492                 server->acl_bitmask = res.acl_bitmask;
1493         }
1494         return status;
1495 }
1496
1497 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1498 {
1499         struct nfs4_exception exception = { };
1500         int err;
1501         do {
1502                 err = nfs4_handle_exception(server,
1503                                 _nfs4_server_capabilities(server, fhandle),
1504                                 &exception);
1505         } while (exception.retry);
1506         return err;
1507 }
1508
1509 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1510                 struct nfs_fsinfo *info)
1511 {
1512         struct nfs4_lookup_root_arg args = {
1513                 .bitmask = nfs4_fattr_bitmap,
1514         };
1515         struct nfs4_lookup_res res = {
1516                 .server = server,
1517                 .fattr = info->fattr,
1518                 .fh = fhandle,
1519         };
1520         struct rpc_message msg = {
1521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1522                 .rpc_argp = &args,
1523                 .rpc_resp = &res,
1524         };
1525         nfs_fattr_init(info->fattr);
1526         return rpc_call_sync(server->client, &msg, 0);
1527 }
1528
1529 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1530                 struct nfs_fsinfo *info)
1531 {
1532         struct nfs4_exception exception = { };
1533         int err;
1534         do {
1535                 err = nfs4_handle_exception(server,
1536                                 _nfs4_lookup_root(server, fhandle, info),
1537                                 &exception);
1538         } while (exception.retry);
1539         return err;
1540 }
1541
1542 /*
1543  * get the file handle for the "/" directory on the server
1544  */
1545 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1546                               struct nfs_fsinfo *info)
1547 {
1548         int status;
1549
1550         status = nfs4_lookup_root(server, fhandle, info);
1551         if (status == 0)
1552                 status = nfs4_server_capabilities(server, fhandle);
1553         if (status == 0)
1554                 status = nfs4_do_fsinfo(server, fhandle, info);
1555         return nfs4_map_errors(status);
1556 }
1557
1558 /*
1559  * Get locations and (maybe) other attributes of a referral.
1560  * Note that we'll actually follow the referral later when
1561  * we detect fsid mismatch in inode revalidation
1562  */
1563 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1564 {
1565         int status = -ENOMEM;
1566         struct page *page = NULL;
1567         struct nfs4_fs_locations *locations = NULL;
1568
1569         page = alloc_page(GFP_KERNEL);
1570         if (page == NULL)
1571                 goto out;
1572         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1573         if (locations == NULL)
1574                 goto out;
1575
1576         status = nfs4_proc_fs_locations(dir, name, locations, page);
1577         if (status != 0)
1578                 goto out;
1579         /* Make sure server returned a different fsid for the referral */
1580         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1581                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1582                 status = -EIO;
1583                 goto out;
1584         }
1585
1586         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1587         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1588         if (!fattr->mode)
1589                 fattr->mode = S_IFDIR;
1590         memset(fhandle, 0, sizeof(struct nfs_fh));
1591 out:
1592         if (page)
1593                 __free_page(page);
1594         if (locations)
1595                 kfree(locations);
1596         return status;
1597 }
1598
1599 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1600 {
1601         struct nfs4_getattr_arg args = {
1602                 .fh = fhandle,
1603                 .bitmask = server->attr_bitmask,
1604         };
1605         struct nfs4_getattr_res res = {
1606                 .fattr = fattr,
1607                 .server = server,
1608         };
1609         struct rpc_message msg = {
1610                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1611                 .rpc_argp = &args,
1612                 .rpc_resp = &res,
1613         };
1614
1615         nfs_fattr_init(fattr);
1616         return rpc_call_sync(server->client, &msg, 0);
1617 }
1618
1619 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1620 {
1621         struct nfs4_exception exception = { };
1622         int err;
1623         do {
1624                 err = nfs4_handle_exception(server,
1625                                 _nfs4_proc_getattr(server, fhandle, fattr),
1626                                 &exception);
1627         } while (exception.retry);
1628         return err;
1629 }
1630
1631 /*
1632  * The file is not closed if it is opened due to the a request to change
1633  * the size of the file. The open call will not be needed once the
1634  * VFS layer lookup-intents are implemented.
1635  *
1636  * Close is called when the inode is destroyed.
1637  * If we haven't opened the file for O_WRONLY, we
1638  * need to in the size_change case to obtain a stateid.
1639  *
1640  * Got race?
1641  * Because OPEN is always done by name in nfsv4, it is
1642  * possible that we opened a different file by the same
1643  * name.  We can recognize this race condition, but we
1644  * can't do anything about it besides returning an error.
1645  *
1646  * This will be fixed with VFS changes (lookup-intent).
1647  */
1648 static int
1649 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1650                   struct iattr *sattr)
1651 {
1652         struct rpc_cred *cred;
1653         struct inode *inode = dentry->d_inode;
1654         struct nfs_open_context *ctx;
1655         struct nfs4_state *state = NULL;
1656         int status;
1657
1658         nfs_fattr_init(fattr);
1659
1660         cred = rpc_lookup_cred();
1661         if (IS_ERR(cred))
1662                 return PTR_ERR(cred);
1663
1664         /* Search for an existing open(O_WRITE) file */
1665         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1666         if (ctx != NULL)
1667                 state = ctx->state;
1668
1669         status = nfs4_do_setattr(inode, fattr, sattr, state);
1670         if (status == 0)
1671                 nfs_setattr_update_inode(inode, sattr);
1672         if (ctx != NULL)
1673                 put_nfs_open_context(ctx);
1674         put_rpccred(cred);
1675         return status;
1676 }
1677
1678 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1679                 const struct qstr *name, struct nfs_fh *fhandle,
1680                 struct nfs_fattr *fattr)
1681 {
1682         int                    status;
1683         struct nfs4_lookup_arg args = {
1684                 .bitmask = server->attr_bitmask,
1685                 .dir_fh = dirfh,
1686                 .name = name,
1687         };
1688         struct nfs4_lookup_res res = {
1689                 .server = server,
1690                 .fattr = fattr,
1691                 .fh = fhandle,
1692         };
1693         struct rpc_message msg = {
1694                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1695                 .rpc_argp = &args,
1696                 .rpc_resp = &res,
1697         };
1698
1699         nfs_fattr_init(fattr);
1700
1701         dprintk("NFS call  lookupfh %s\n", name->name);
1702         status = rpc_call_sync(server->client, &msg, 0);
1703         dprintk("NFS reply lookupfh: %d\n", status);
1704         return status;
1705 }
1706
1707 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1708                               struct qstr *name, struct nfs_fh *fhandle,
1709                               struct nfs_fattr *fattr)
1710 {
1711         struct nfs4_exception exception = { };
1712         int err;
1713         do {
1714                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1715                 /* FIXME: !!!! */
1716                 if (err == -NFS4ERR_MOVED) {
1717                         err = -EREMOTE;
1718                         break;
1719                 }
1720                 err = nfs4_handle_exception(server, err, &exception);
1721         } while (exception.retry);
1722         return err;
1723 }
1724
1725 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1726                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1727 {
1728         int status;
1729
1730         dprintk("NFS call  lookup %s\n", name->name);
1731         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1732         if (status == -NFS4ERR_MOVED)
1733                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1734         dprintk("NFS reply lookup: %d\n", status);
1735         return status;
1736 }
1737
1738 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1739 {
1740         struct nfs4_exception exception = { };
1741         int err;
1742         do {
1743                 err = nfs4_handle_exception(NFS_SERVER(dir),
1744                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1745                                 &exception);
1746         } while (exception.retry);
1747         return err;
1748 }
1749
1750 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1751 {
1752         struct nfs_server *server = NFS_SERVER(inode);
1753         struct nfs_fattr fattr;
1754         struct nfs4_accessargs args = {
1755                 .fh = NFS_FH(inode),
1756                 .bitmask = server->attr_bitmask,
1757         };
1758         struct nfs4_accessres res = {
1759                 .server = server,
1760                 .fattr = &fattr,
1761         };
1762         struct rpc_message msg = {
1763                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1764                 .rpc_argp = &args,
1765                 .rpc_resp = &res,
1766                 .rpc_cred = entry->cred,
1767         };
1768         int mode = entry->mask;
1769         int status;
1770
1771         /*
1772          * Determine which access bits we want to ask for...
1773          */
1774         if (mode & MAY_READ)
1775                 args.access |= NFS4_ACCESS_READ;
1776         if (S_ISDIR(inode->i_mode)) {
1777                 if (mode & MAY_WRITE)
1778                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1779                 if (mode & MAY_EXEC)
1780                         args.access |= NFS4_ACCESS_LOOKUP;
1781         } else {
1782                 if (mode & MAY_WRITE)
1783                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1784                 if (mode & MAY_EXEC)
1785                         args.access |= NFS4_ACCESS_EXECUTE;
1786         }
1787         nfs_fattr_init(&fattr);
1788         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1789         if (!status) {
1790                 entry->mask = 0;
1791                 if (res.access & NFS4_ACCESS_READ)
1792                         entry->mask |= MAY_READ;
1793                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1794                         entry->mask |= MAY_WRITE;
1795                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1796                         entry->mask |= MAY_EXEC;
1797                 nfs_refresh_inode(inode, &fattr);
1798         }
1799         return status;
1800 }
1801
1802 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1803 {
1804         struct nfs4_exception exception = { };
1805         int err;
1806         do {
1807                 err = nfs4_handle_exception(NFS_SERVER(inode),
1808                                 _nfs4_proc_access(inode, entry),
1809                                 &exception);
1810         } while (exception.retry);
1811         return err;
1812 }
1813
1814 /*
1815  * TODO: For the time being, we don't try to get any attributes
1816  * along with any of the zero-copy operations READ, READDIR,
1817  * READLINK, WRITE.
1818  *
1819  * In the case of the first three, we want to put the GETATTR
1820  * after the read-type operation -- this is because it is hard
1821  * to predict the length of a GETATTR response in v4, and thus
1822  * align the READ data correctly.  This means that the GETATTR
1823  * may end up partially falling into the page cache, and we should
1824  * shift it into the 'tail' of the xdr_buf before processing.
1825  * To do this efficiently, we need to know the total length
1826  * of data received, which doesn't seem to be available outside
1827  * of the RPC layer.
1828  *
1829  * In the case of WRITE, we also want to put the GETATTR after
1830  * the operation -- in this case because we want to make sure
1831  * we get the post-operation mtime and size.  This means that
1832  * we can't use xdr_encode_pages() as written: we need a variant
1833  * of it which would leave room in the 'tail' iovec.
1834  *
1835  * Both of these changes to the XDR layer would in fact be quite
1836  * minor, but I decided to leave them for a subsequent patch.
1837  */
1838 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1839                 unsigned int pgbase, unsigned int pglen)
1840 {
1841         struct nfs4_readlink args = {
1842                 .fh       = NFS_FH(inode),
1843                 .pgbase   = pgbase,
1844                 .pglen    = pglen,
1845                 .pages    = &page,
1846         };
1847         struct rpc_message msg = {
1848                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1849                 .rpc_argp = &args,
1850                 .rpc_resp = NULL,
1851         };
1852
1853         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1854 }
1855
1856 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1857                 unsigned int pgbase, unsigned int pglen)
1858 {
1859         struct nfs4_exception exception = { };
1860         int err;
1861         do {
1862                 err = nfs4_handle_exception(NFS_SERVER(inode),
1863                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1864                                 &exception);
1865         } while (exception.retry);
1866         return err;
1867 }
1868
1869 /*
1870  * Got race?
1871  * We will need to arrange for the VFS layer to provide an atomic open.
1872  * Until then, this create/open method is prone to inefficiency and race
1873  * conditions due to the lookup, create, and open VFS calls from sys_open()
1874  * placed on the wire.
1875  *
1876  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1877  * The file will be opened again in the subsequent VFS open call
1878  * (nfs4_proc_file_open).
1879  *
1880  * The open for read will just hang around to be used by any process that
1881  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1882  */
1883
1884 static int
1885 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1886                  int flags, struct nameidata *nd)
1887 {
1888         struct path path = {
1889                 .mnt = nd->path.mnt,
1890                 .dentry = dentry,
1891         };
1892         struct nfs4_state *state;
1893         struct rpc_cred *cred;
1894         int status = 0;
1895
1896         cred = rpc_lookup_cred();
1897         if (IS_ERR(cred)) {
1898                 status = PTR_ERR(cred);
1899                 goto out;
1900         }
1901         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1902         put_rpccred(cred);
1903         d_drop(dentry);
1904         if (IS_ERR(state)) {
1905                 status = PTR_ERR(state);
1906                 goto out;
1907         }
1908         d_add(dentry, igrab(state->inode));
1909         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1910         if (flags & O_EXCL) {
1911                 struct nfs_fattr fattr;
1912                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1913                 if (status == 0)
1914                         nfs_setattr_update_inode(state->inode, sattr);
1915                 nfs_post_op_update_inode(state->inode, &fattr);
1916         }
1917         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1918                 status = nfs4_intent_set_file(nd, &path, state);
1919         else
1920                 nfs4_close_sync(&path, state, flags);
1921 out:
1922         return status;
1923 }
1924
1925 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1926 {
1927         struct nfs_server *server = NFS_SERVER(dir);
1928         struct nfs_removeargs args = {
1929                 .fh = NFS_FH(dir),
1930                 .name.len = name->len,
1931                 .name.name = name->name,
1932                 .bitmask = server->attr_bitmask,
1933         };
1934         struct nfs_removeres res = {
1935                 .server = server,
1936         };
1937         struct rpc_message msg = {
1938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1939                 .rpc_argp = &args,
1940                 .rpc_resp = &res,
1941         };
1942         int                     status;
1943
1944         nfs_fattr_init(&res.dir_attr);
1945         status = rpc_call_sync(server->client, &msg, 0);
1946         if (status == 0) {
1947                 update_changeattr(dir, &res.cinfo);
1948                 nfs_post_op_update_inode(dir, &res.dir_attr);
1949         }
1950         return status;
1951 }
1952
1953 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1954 {
1955         struct nfs4_exception exception = { };
1956         int err;
1957         do {
1958                 err = nfs4_handle_exception(NFS_SERVER(dir),
1959                                 _nfs4_proc_remove(dir, name),
1960                                 &exception);
1961         } while (exception.retry);
1962         return err;
1963 }
1964
1965 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1966 {
1967         struct nfs_server *server = NFS_SERVER(dir);
1968         struct nfs_removeargs *args = msg->rpc_argp;
1969         struct nfs_removeres *res = msg->rpc_resp;
1970
1971         args->bitmask = server->attr_bitmask;
1972         res->server = server;
1973         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1974 }
1975
1976 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1977 {
1978         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1979
1980         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1981                 return 0;
1982         update_changeattr(dir, &res->cinfo);
1983         nfs_post_op_update_inode(dir, &res->dir_attr);
1984         return 1;
1985 }
1986
1987 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1988                 struct inode *new_dir, struct qstr *new_name)
1989 {
1990         struct nfs_server *server = NFS_SERVER(old_dir);
1991         struct nfs4_rename_arg arg = {
1992                 .old_dir = NFS_FH(old_dir),
1993                 .new_dir = NFS_FH(new_dir),
1994                 .old_name = old_name,
1995                 .new_name = new_name,
1996                 .bitmask = server->attr_bitmask,
1997         };
1998         struct nfs_fattr old_fattr, new_fattr;
1999         struct nfs4_rename_res res = {
2000                 .server = server,
2001                 .old_fattr = &old_fattr,
2002                 .new_fattr = &new_fattr,
2003         };
2004         struct rpc_message msg = {
2005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2006                 .rpc_argp = &arg,
2007                 .rpc_resp = &res,
2008         };
2009         int                     status;
2010
2011         nfs_fattr_init(res.old_fattr);
2012         nfs_fattr_init(res.new_fattr);
2013         status = rpc_call_sync(server->client, &msg, 0);
2014
2015         if (!status) {
2016                 update_changeattr(old_dir, &res.old_cinfo);
2017                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2018                 update_changeattr(new_dir, &res.new_cinfo);
2019                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2020         }
2021         return status;
2022 }
2023
2024 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2025                 struct inode *new_dir, struct qstr *new_name)
2026 {
2027         struct nfs4_exception exception = { };
2028         int err;
2029         do {
2030                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2031                                 _nfs4_proc_rename(old_dir, old_name,
2032                                         new_dir, new_name),
2033                                 &exception);
2034         } while (exception.retry);
2035         return err;
2036 }
2037
2038 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2039 {
2040         struct nfs_server *server = NFS_SERVER(inode);
2041         struct nfs4_link_arg arg = {
2042                 .fh     = NFS_FH(inode),
2043                 .dir_fh = NFS_FH(dir),
2044                 .name   = name,
2045                 .bitmask = server->attr_bitmask,
2046         };
2047         struct nfs_fattr fattr, dir_attr;
2048         struct nfs4_link_res res = {
2049                 .server = server,
2050                 .fattr = &fattr,
2051                 .dir_attr = &dir_attr,
2052         };
2053         struct rpc_message msg = {
2054                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2055                 .rpc_argp = &arg,
2056                 .rpc_resp = &res,
2057         };
2058         int                     status;
2059
2060         nfs_fattr_init(res.fattr);
2061         nfs_fattr_init(res.dir_attr);
2062         status = rpc_call_sync(server->client, &msg, 0);
2063         if (!status) {
2064                 update_changeattr(dir, &res.cinfo);
2065                 nfs_post_op_update_inode(dir, res.dir_attr);
2066                 nfs_post_op_update_inode(inode, res.fattr);
2067         }
2068
2069         return status;
2070 }
2071
2072 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2073 {
2074         struct nfs4_exception exception = { };
2075         int err;
2076         do {
2077                 err = nfs4_handle_exception(NFS_SERVER(inode),
2078                                 _nfs4_proc_link(inode, dir, name),
2079                                 &exception);
2080         } while (exception.retry);
2081         return err;
2082 }
2083
2084 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2085                 struct page *page, unsigned int len, struct iattr *sattr)
2086 {
2087         struct nfs_server *server = NFS_SERVER(dir);
2088         struct nfs_fh fhandle;
2089         struct nfs_fattr fattr, dir_fattr;
2090         struct nfs4_create_arg arg = {
2091                 .dir_fh = NFS_FH(dir),
2092                 .server = server,
2093                 .name = &dentry->d_name,
2094                 .attrs = sattr,
2095                 .ftype = NF4LNK,
2096                 .bitmask = server->attr_bitmask,
2097         };
2098         struct nfs4_create_res res = {
2099                 .server = server,
2100                 .fh = &fhandle,
2101                 .fattr = &fattr,
2102                 .dir_fattr = &dir_fattr,
2103         };
2104         struct rpc_message msg = {
2105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2106                 .rpc_argp = &arg,
2107                 .rpc_resp = &res,
2108         };
2109         int                     status;
2110
2111         if (len > NFS4_MAXPATHLEN)
2112                 return -ENAMETOOLONG;
2113
2114         arg.u.symlink.pages = &page;
2115         arg.u.symlink.len = len;
2116         nfs_fattr_init(&fattr);
2117         nfs_fattr_init(&dir_fattr);
2118
2119         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2120         if (!status) {
2121                 update_changeattr(dir, &res.dir_cinfo);
2122                 nfs_post_op_update_inode(dir, res.dir_fattr);
2123                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2124         }
2125         return status;
2126 }
2127
2128 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2129                 struct page *page, unsigned int len, struct iattr *sattr)
2130 {
2131         struct nfs4_exception exception = { };
2132         int err;
2133         do {
2134                 err = nfs4_handle_exception(NFS_SERVER(dir),
2135                                 _nfs4_proc_symlink(dir, dentry, page,
2136                                                         len, sattr),
2137                                 &exception);
2138         } while (exception.retry);
2139         return err;
2140 }
2141
2142 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2143                 struct iattr *sattr)
2144 {
2145         struct nfs_server *server = NFS_SERVER(dir);
2146         struct nfs_fh fhandle;
2147         struct nfs_fattr fattr, dir_fattr;
2148         struct nfs4_create_arg arg = {
2149                 .dir_fh = NFS_FH(dir),
2150                 .server = server,
2151                 .name = &dentry->d_name,
2152                 .attrs = sattr,
2153                 .ftype = NF4DIR,
2154                 .bitmask = server->attr_bitmask,
2155         };
2156         struct nfs4_create_res res = {
2157                 .server = server,
2158                 .fh = &fhandle,
2159                 .fattr = &fattr,
2160                 .dir_fattr = &dir_fattr,
2161         };
2162         struct rpc_message msg = {
2163                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2164                 .rpc_argp = &arg,
2165                 .rpc_resp = &res,
2166         };
2167         int                     status;
2168
2169         nfs_fattr_init(&fattr);
2170         nfs_fattr_init(&dir_fattr);
2171
2172         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2173         if (!status) {
2174                 update_changeattr(dir, &res.dir_cinfo);
2175                 nfs_post_op_update_inode(dir, res.dir_fattr);
2176                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2177         }
2178         return status;
2179 }
2180
2181 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2182                 struct iattr *sattr)
2183 {
2184         struct nfs4_exception exception = { };
2185         int err;
2186         do {
2187                 err = nfs4_handle_exception(NFS_SERVER(dir),
2188                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2189                                 &exception);
2190         } while (exception.retry);
2191         return err;
2192 }
2193
2194 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2195                   u64 cookie, struct page *page, unsigned int count, int plus)
2196 {
2197         struct inode            *dir = dentry->d_inode;
2198         struct nfs4_readdir_arg args = {
2199                 .fh = NFS_FH(dir),
2200                 .pages = &page,
2201                 .pgbase = 0,
2202                 .count = count,
2203                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2204         };
2205         struct nfs4_readdir_res res;
2206         struct rpc_message msg = {
2207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2208                 .rpc_argp = &args,
2209                 .rpc_resp = &res,
2210                 .rpc_cred = cred,
2211         };
2212         int                     status;
2213
2214         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2215                         dentry->d_parent->d_name.name,
2216                         dentry->d_name.name,
2217                         (unsigned long long)cookie);
2218         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2219         res.pgbase = args.pgbase;
2220         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2221         if (status == 0)
2222                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2223
2224         nfs_invalidate_atime(dir);
2225
2226         dprintk("%s: returns %d\n", __FUNCTION__, status);
2227         return status;
2228 }
2229
2230 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2231                   u64 cookie, struct page *page, unsigned int count, int plus)
2232 {
2233         struct nfs4_exception exception = { };
2234         int err;
2235         do {
2236                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2237                                 _nfs4_proc_readdir(dentry, cred, cookie,
2238                                         page, count, plus),
2239                                 &exception);
2240         } while (exception.retry);
2241         return err;
2242 }
2243
2244 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2245                 struct iattr *sattr, dev_t rdev)
2246 {
2247         struct nfs_server *server = NFS_SERVER(dir);
2248         struct nfs_fh fh;
2249         struct nfs_fattr fattr, dir_fattr;
2250         struct nfs4_create_arg arg = {
2251                 .dir_fh = NFS_FH(dir),
2252                 .server = server,
2253                 .name = &dentry->d_name,
2254                 .attrs = sattr,
2255                 .bitmask = server->attr_bitmask,
2256         };
2257         struct nfs4_create_res res = {
2258                 .server = server,
2259                 .fh = &fh,
2260                 .fattr = &fattr,
2261                 .dir_fattr = &dir_fattr,
2262         };
2263         struct rpc_message msg = {
2264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2265                 .rpc_argp = &arg,
2266                 .rpc_resp = &res,
2267         };
2268         int                     status;
2269         int                     mode = sattr->ia_mode;
2270
2271         nfs_fattr_init(&fattr);
2272         nfs_fattr_init(&dir_fattr);
2273
2274         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2275         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2276         if (S_ISFIFO(mode))
2277                 arg.ftype = NF4FIFO;
2278         else if (S_ISBLK(mode)) {
2279                 arg.ftype = NF4BLK;
2280                 arg.u.device.specdata1 = MAJOR(rdev);
2281                 arg.u.device.specdata2 = MINOR(rdev);
2282         }
2283         else if (S_ISCHR(mode)) {
2284                 arg.ftype = NF4CHR;
2285                 arg.u.device.specdata1 = MAJOR(rdev);
2286                 arg.u.device.specdata2 = MINOR(rdev);
2287         }
2288         else
2289                 arg.ftype = NF4SOCK;
2290
2291         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2292         if (status == 0) {
2293                 update_changeattr(dir, &res.dir_cinfo);
2294                 nfs_post_op_update_inode(dir, res.dir_fattr);
2295                 status = nfs_instantiate(dentry, &fh, &fattr);
2296         }
2297         return status;
2298 }
2299
2300 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2301                 struct iattr *sattr, dev_t rdev)
2302 {
2303         struct nfs4_exception exception = { };
2304         int err;
2305         do {
2306                 err = nfs4_handle_exception(NFS_SERVER(dir),
2307                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2308                                 &exception);
2309         } while (exception.retry);
2310         return err;
2311 }
2312
2313 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2314                  struct nfs_fsstat *fsstat)
2315 {
2316         struct nfs4_statfs_arg args = {
2317                 .fh = fhandle,
2318                 .bitmask = server->attr_bitmask,
2319         };
2320         struct rpc_message msg = {
2321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2322                 .rpc_argp = &args,
2323                 .rpc_resp = fsstat,
2324         };
2325
2326         nfs_fattr_init(fsstat->fattr);
2327         return rpc_call_sync(server->client, &msg, 0);
2328 }
2329
2330 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2331 {
2332         struct nfs4_exception exception = { };
2333         int err;
2334         do {
2335                 err = nfs4_handle_exception(server,
2336                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2337                                 &exception);
2338         } while (exception.retry);
2339         return err;
2340 }
2341
2342 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2343                 struct nfs_fsinfo *fsinfo)
2344 {
2345         struct nfs4_fsinfo_arg args = {
2346                 .fh = fhandle,
2347                 .bitmask = server->attr_bitmask,
2348         };
2349         struct rpc_message msg = {
2350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2351                 .rpc_argp = &args,
2352                 .rpc_resp = fsinfo,
2353         };
2354
2355         return rpc_call_sync(server->client, &msg, 0);
2356 }
2357
2358 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2359 {
2360         struct nfs4_exception exception = { };
2361         int err;
2362
2363         do {
2364                 err = nfs4_handle_exception(server,
2365                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2366                                 &exception);
2367         } while (exception.retry);
2368         return err;
2369 }
2370
2371 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2372 {
2373         nfs_fattr_init(fsinfo->fattr);
2374         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2375 }
2376
2377 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2378                 struct nfs_pathconf *pathconf)
2379 {
2380         struct nfs4_pathconf_arg args = {
2381                 .fh = fhandle,
2382                 .bitmask = server->attr_bitmask,
2383         };
2384         struct rpc_message msg = {
2385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2386                 .rpc_argp = &args,
2387                 .rpc_resp = pathconf,
2388         };
2389
2390         /* None of the pathconf attributes are mandatory to implement */
2391         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2392                 memset(pathconf, 0, sizeof(*pathconf));
2393                 return 0;
2394         }
2395
2396         nfs_fattr_init(pathconf->fattr);
2397         return rpc_call_sync(server->client, &msg, 0);
2398 }
2399
2400 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2401                 struct nfs_pathconf *pathconf)
2402 {
2403         struct nfs4_exception exception = { };
2404         int err;
2405
2406         do {
2407                 err = nfs4_handle_exception(server,
2408                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2409                                 &exception);
2410         } while (exception.retry);
2411         return err;
2412 }
2413
2414 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2415 {
2416         struct nfs_server *server = NFS_SERVER(data->inode);
2417
2418         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2419                 rpc_restart_call(task);
2420                 return -EAGAIN;
2421         }
2422
2423         nfs_invalidate_atime(data->inode);
2424         if (task->tk_status > 0)
2425                 renew_lease(server, data->timestamp);
2426         return 0;
2427 }
2428
2429 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2430 {
2431         data->timestamp   = jiffies;
2432         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2433 }
2434
2435 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2436 {
2437         struct inode *inode = data->inode;
2438
2439         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2440                 rpc_restart_call(task);
2441                 return -EAGAIN;
2442         }
2443         if (task->tk_status >= 0) {
2444                 renew_lease(NFS_SERVER(inode), data->timestamp);
2445                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2446         }
2447         return 0;
2448 }
2449
2450 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2451 {
2452         struct nfs_server *server = NFS_SERVER(data->inode);
2453
2454         data->args.bitmask = server->attr_bitmask;
2455         data->res.server = server;
2456         data->timestamp   = jiffies;
2457
2458         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2459 }
2460
2461 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2462 {
2463         struct inode *inode = data->inode;
2464
2465         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2466                 rpc_restart_call(task);
2467                 return -EAGAIN;
2468         }
2469         nfs_refresh_inode(inode, data->res.fattr);
2470         return 0;
2471 }
2472
2473 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2474 {
2475         struct nfs_server *server = NFS_SERVER(data->inode);
2476
2477         data->args.bitmask = server->attr_bitmask;
2478         data->res.server = server;
2479         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2480 }
2481
2482 /*
2483  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2484  * standalone procedure for queueing an asynchronous RENEW.
2485  */
2486 static void nfs4_renew_done(struct rpc_task *task, void *data)
2487 {
2488         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2489         unsigned long timestamp = (unsigned long)data;
2490
2491         if (task->tk_status < 0) {
2492                 switch (task->tk_status) {
2493                         case -NFS4ERR_STALE_CLIENTID:
2494                         case -NFS4ERR_EXPIRED:
2495                         case -NFS4ERR_CB_PATH_DOWN:
2496                                 nfs4_schedule_state_recovery(clp);
2497                 }
2498                 return;
2499         }
2500         spin_lock(&clp->cl_lock);
2501         if (time_before(clp->cl_last_renewal,timestamp))
2502                 clp->cl_last_renewal = timestamp;
2503         spin_unlock(&clp->cl_lock);
2504 }
2505
2506 static const struct rpc_call_ops nfs4_renew_ops = {
2507         .rpc_call_done = nfs4_renew_done,
2508 };
2509
2510 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2511 {
2512         struct rpc_message msg = {
2513                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2514                 .rpc_argp       = clp,
2515                 .rpc_cred       = cred,
2516         };
2517
2518         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2519                         &nfs4_renew_ops, (void *)jiffies);
2520 }
2521
2522 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2523 {
2524         struct rpc_message msg = {
2525                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2526                 .rpc_argp       = clp,
2527                 .rpc_cred       = cred,
2528         };
2529         unsigned long now = jiffies;
2530         int status;
2531
2532         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2533         if (status < 0)
2534                 return status;
2535         spin_lock(&clp->cl_lock);
2536         if (time_before(clp->cl_last_renewal,now))
2537                 clp->cl_last_renewal = now;
2538         spin_unlock(&clp->cl_lock);
2539         return 0;
2540 }
2541
2542 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2543 {
2544         return (server->caps & NFS_CAP_ACLS)
2545                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2546                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2547 }
2548
2549 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2550  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2551  * the stack.
2552  */
2553 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2554
2555 static void buf_to_pages(const void *buf, size_t buflen,
2556                 struct page **pages, unsigned int *pgbase)
2557 {
2558         const void *p = buf;
2559
2560         *pgbase = offset_in_page(buf);
2561         p -= *pgbase;
2562         while (p < buf + buflen) {
2563                 *(pages++) = virt_to_page(p);
2564                 p += PAGE_CACHE_SIZE;
2565         }
2566 }
2567
2568 struct nfs4_cached_acl {
2569         int cached;
2570         size_t len;
2571         char data[0];
2572 };
2573
2574 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2575 {
2576         struct nfs_inode *nfsi = NFS_I(inode);
2577
2578         spin_lock(&inode->i_lock);
2579         kfree(nfsi->nfs4_acl);
2580         nfsi->nfs4_acl = acl;
2581         spin_unlock(&inode->i_lock);
2582 }
2583
2584 static void nfs4_zap_acl_attr(struct inode *inode)
2585 {
2586         nfs4_set_cached_acl(inode, NULL);
2587 }
2588
2589 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2590 {
2591         struct nfs_inode *nfsi = NFS_I(inode);
2592         struct nfs4_cached_acl *acl;
2593         int ret = -ENOENT;
2594
2595         spin_lock(&inode->i_lock);
2596         acl = nfsi->nfs4_acl;
2597         if (acl == NULL)
2598                 goto out;
2599         if (buf == NULL) /* user is just asking for length */
2600                 goto out_len;
2601         if (acl->cached == 0)
2602                 goto out;
2603         ret = -ERANGE; /* see getxattr(2) man page */
2604         if (acl->len > buflen)
2605                 goto out;
2606         memcpy(buf, acl->data, acl->len);
2607 out_len:
2608         ret = acl->len;
2609 out:
2610         spin_unlock(&inode->i_lock);
2611         return ret;
2612 }
2613
2614 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2615 {
2616         struct nfs4_cached_acl *acl;
2617
2618         if (buf && acl_len <= PAGE_SIZE) {
2619                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2620                 if (acl == NULL)
2621                         goto out;
2622                 acl->cached = 1;
2623                 memcpy(acl->data, buf, acl_len);
2624         } else {
2625                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2626                 if (acl == NULL)
2627                         goto out;
2628                 acl->cached = 0;
2629         }
2630         acl->len = acl_len;
2631 out:
2632         nfs4_set_cached_acl(inode, acl);
2633 }
2634
2635 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2636 {
2637         struct page *pages[NFS4ACL_MAXPAGES];
2638         struct nfs_getaclargs args = {
2639                 .fh = NFS_FH(inode),
2640                 .acl_pages = pages,
2641                 .acl_len = buflen,
2642         };
2643         size_t resp_len = buflen;
2644         void *resp_buf;
2645         struct rpc_message msg = {
2646                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2647                 .rpc_argp = &args,
2648                 .rpc_resp = &resp_len,
2649         };
2650         struct page *localpage = NULL;
2651         int ret;
2652
2653         if (buflen < PAGE_SIZE) {
2654                 /* As long as we're doing a round trip to the server anyway,
2655                  * let's be prepared for a page of acl data. */
2656                 localpage = alloc_page(GFP_KERNEL);
2657                 resp_buf = page_address(localpage);
2658                 if (localpage == NULL)
2659                         return -ENOMEM;
2660                 args.acl_pages[0] = localpage;
2661                 args.acl_pgbase = 0;
2662                 resp_len = args.acl_len = PAGE_SIZE;
2663         } else {
2664                 resp_buf = buf;
2665                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2666         }
2667         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2668         if (ret)
2669                 goto out_free;
2670         if (resp_len > args.acl_len)
2671                 nfs4_write_cached_acl(inode, NULL, resp_len);
2672         else
2673                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2674         if (buf) {
2675                 ret = -ERANGE;
2676                 if (resp_len > buflen)
2677                         goto out_free;
2678                 if (localpage)
2679                         memcpy(buf, resp_buf, resp_len);
2680         }
2681         ret = resp_len;
2682 out_free:
2683         if (localpage)
2684                 __free_page(localpage);
2685         return ret;
2686 }
2687
2688 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2689 {
2690         struct nfs4_exception exception = { };
2691         ssize_t ret;
2692         do {
2693                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2694                 if (ret >= 0)
2695                         break;
2696                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2697         } while (exception.retry);
2698         return ret;
2699 }
2700
2701 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2702 {
2703         struct nfs_server *server = NFS_SERVER(inode);
2704         int ret;
2705
2706         if (!nfs4_server_supports_acls(server))
2707                 return -EOPNOTSUPP;
2708         ret = nfs_revalidate_inode(server, inode);
2709         if (ret < 0)
2710                 return ret;
2711         ret = nfs4_read_cached_acl(inode, buf, buflen);
2712         if (ret != -ENOENT)
2713                 return ret;
2714         return nfs4_get_acl_uncached(inode, buf, buflen);
2715 }
2716
2717 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2718 {
2719         struct nfs_server *server = NFS_SERVER(inode);
2720         struct page *pages[NFS4ACL_MAXPAGES];
2721         struct nfs_setaclargs arg = {
2722                 .fh             = NFS_FH(inode),
2723                 .acl_pages      = pages,
2724                 .acl_len        = buflen,
2725         };
2726         struct rpc_message msg = {
2727                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2728                 .rpc_argp       = &arg,
2729                 .rpc_resp       = NULL,
2730         };
2731         int ret;
2732
2733         if (!nfs4_server_supports_acls(server))
2734                 return -EOPNOTSUPP;
2735         nfs_inode_return_delegation(inode);
2736         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2737         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2738         nfs_zap_caches(inode);
2739         return ret;
2740 }
2741
2742 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2743 {
2744         struct nfs4_exception exception = { };
2745         int err;
2746         do {
2747                 err = nfs4_handle_exception(NFS_SERVER(inode),
2748                                 __nfs4_proc_set_acl(inode, buf, buflen),
2749                                 &exception);
2750         } while (exception.retry);
2751         return err;
2752 }
2753
2754 static int
2755 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2756 {
2757         struct nfs_client *clp = server->nfs_client;
2758
2759         if (!clp || task->tk_status >= 0)
2760                 return 0;
2761         switch(task->tk_status) {
2762                 case -NFS4ERR_STALE_CLIENTID:
2763                 case -NFS4ERR_STALE_STATEID:
2764                 case -NFS4ERR_EXPIRED:
2765                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2766                         nfs4_schedule_state_recovery(clp);
2767                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2768                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2769                         task->tk_status = 0;
2770                         return -EAGAIN;
2771                 case -NFS4ERR_DELAY:
2772                         nfs_inc_server_stats((struct nfs_server *) server,
2773                                                 NFSIOS_DELAY);
2774                 case -NFS4ERR_GRACE:
2775                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2776                         task->tk_status = 0;
2777                         return -EAGAIN;
2778                 case -NFS4ERR_OLD_STATEID:
2779                         task->tk_status = 0;
2780                         return -EAGAIN;
2781         }
2782         task->tk_status = nfs4_map_errors(task->tk_status);
2783         return 0;
2784 }
2785
2786 static int nfs4_wait_bit_killable(void *word)
2787 {
2788         if (fatal_signal_pending(current))
2789                 return -ERESTARTSYS;
2790         schedule();
2791         return 0;
2792 }
2793
2794 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2795 {
2796         int res;
2797
2798         might_sleep();
2799
2800         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2801
2802         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2803                         nfs4_wait_bit_killable, TASK_KILLABLE);
2804
2805         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2806         return res;
2807 }
2808
2809 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2810 {
2811         int res = 0;
2812
2813         might_sleep();
2814
2815         if (*timeout <= 0)
2816                 *timeout = NFS4_POLL_RETRY_MIN;
2817         if (*timeout > NFS4_POLL_RETRY_MAX)
2818                 *timeout = NFS4_POLL_RETRY_MAX;
2819         schedule_timeout_killable(*timeout);
2820         if (fatal_signal_pending(current))
2821                 res = -ERESTARTSYS;
2822         *timeout <<= 1;
2823         return res;
2824 }
2825
2826 /* This is the error handling routine for processes that are allowed
2827  * to sleep.
2828  */
2829 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2830 {
2831         struct nfs_client *clp = server->nfs_client;
2832         int ret = errorcode;
2833
2834         exception->retry = 0;
2835         switch(errorcode) {
2836                 case 0:
2837                         return 0;
2838                 case -NFS4ERR_STALE_CLIENTID:
2839                 case -NFS4ERR_STALE_STATEID:
2840                 case -NFS4ERR_EXPIRED:
2841                         nfs4_schedule_state_recovery(clp);
2842                         ret = nfs4_wait_clnt_recover(server->client, clp);
2843                         if (ret == 0)
2844                                 exception->retry = 1;
2845                         break;
2846                 case -NFS4ERR_FILE_OPEN:
2847                 case -NFS4ERR_GRACE:
2848                 case -NFS4ERR_DELAY:
2849                         ret = nfs4_delay(server->client, &exception->timeout);
2850                         if (ret != 0)
2851                                 break;
2852                 case -NFS4ERR_OLD_STATEID:
2853                         exception->retry = 1;
2854         }
2855         /* We failed to handle the error */
2856         return nfs4_map_errors(ret);
2857 }
2858
2859 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2860 {
2861         nfs4_verifier sc_verifier;
2862         struct nfs4_setclientid setclientid = {
2863                 .sc_verifier = &sc_verifier,
2864                 .sc_prog = program,
2865         };
2866         struct rpc_message msg = {
2867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2868                 .rpc_argp = &setclientid,
2869                 .rpc_resp = clp,
2870                 .rpc_cred = cred,
2871         };
2872         __be32 *p;
2873         int loop = 0;
2874         int status;
2875
2876         p = (__be32*)sc_verifier.data;
2877         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2878         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2879
2880         for(;;) {
2881                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2882                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2883                                 clp->cl_ipaddr,
2884                                 rpc_peeraddr2str(clp->cl_rpcclient,
2885                                                         RPC_DISPLAY_ADDR),
2886                                 rpc_peeraddr2str(clp->cl_rpcclient,
2887                                                         RPC_DISPLAY_PROTO),
2888                                 cred->cr_ops->cr_name,
2889                                 clp->cl_id_uniquifier);
2890                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2891                                 sizeof(setclientid.sc_netid),
2892                                 rpc_peeraddr2str(clp->cl_rpcclient,
2893                                                         RPC_DISPLAY_NETID));
2894                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2895                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2896                                 clp->cl_ipaddr, port >> 8, port & 255);
2897
2898                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2899                 if (status != -NFS4ERR_CLID_INUSE)
2900                         break;
2901                 if (signalled())
2902                         break;
2903                 if (loop++ & 1)
2904                         ssleep(clp->cl_lease_time + 1);
2905                 else
2906                         if (++clp->cl_id_uniquifier == 0)
2907                                 break;
2908         }
2909         return status;
2910 }
2911
2912 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2913 {
2914         struct nfs_fsinfo fsinfo;
2915         struct rpc_message msg = {
2916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2917                 .rpc_argp = clp,
2918                 .rpc_resp = &fsinfo,
2919                 .rpc_cred = cred,
2920         };
2921         unsigned long now;
2922         int status;
2923
2924         now = jiffies;
2925         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2926         if (status == 0) {
2927                 spin_lock(&clp->cl_lock);
2928                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2929                 clp->cl_last_renewal = now;
2930                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2931                 spin_unlock(&clp->cl_lock);
2932         }
2933         return status;
2934 }
2935
2936 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2937 {
2938         long timeout;
2939         int err;
2940         do {
2941                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2942                 switch (err) {
2943                         case 0:
2944                                 return err;
2945                         case -NFS4ERR_RESOURCE:
2946                                 /* The IBM lawyers misread another document! */
2947                         case -NFS4ERR_DELAY:
2948                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2949                 }
2950         } while (err == 0);
2951         return err;
2952 }
2953
2954 struct nfs4_delegreturndata {
2955         struct nfs4_delegreturnargs args;
2956         struct nfs4_delegreturnres res;
2957         struct nfs_fh fh;
2958         nfs4_stateid stateid;
2959         unsigned long timestamp;
2960         struct nfs_fattr fattr;
2961         int rpc_status;
2962 };
2963
2964 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2965 {
2966         struct nfs4_delegreturndata *data = calldata;
2967         data->rpc_status = task->tk_status;
2968         if (data->rpc_status == 0)
2969                 renew_lease(data->res.server, data->timestamp);
2970 }
2971
2972 static void nfs4_delegreturn_release(void *calldata)
2973 {
2974         kfree(calldata);
2975 }
2976
2977 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2978         .rpc_call_done = nfs4_delegreturn_done,
2979         .rpc_release = nfs4_delegreturn_release,
2980 };
2981
2982 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
2983 {
2984         struct nfs4_delegreturndata *data;
2985         struct nfs_server *server = NFS_SERVER(inode);
2986         struct rpc_task *task;
2987         struct rpc_message msg = {
2988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2989                 .rpc_cred = cred,
2990         };
2991         struct rpc_task_setup task_setup_data = {
2992                 .rpc_client = server->client,
2993                 .rpc_message = &msg,
2994                 .callback_ops = &nfs4_delegreturn_ops,
2995                 .flags = RPC_TASK_ASYNC,
2996         };
2997         int status = 0;
2998
2999         data = kmalloc(sizeof(*data), GFP_KERNEL);
3000         if (data == NULL)
3001                 return -ENOMEM;
3002         data->args.fhandle = &data->fh;
3003         data->args.stateid = &data->stateid;
3004         data->args.bitmask = server->attr_bitmask;
3005         nfs_copy_fh(&data->fh, NFS_FH(inode));
3006         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3007         data->res.fattr = &data->fattr;
3008         data->res.server = server;
3009         nfs_fattr_init(data->res.fattr);
3010         data->timestamp = jiffies;
3011         data->rpc_status = 0;
3012
3013         task_setup_data.callback_data = data;
3014         msg.rpc_argp = &data->args,
3015         msg.rpc_resp = &data->res,
3016         task = rpc_run_task(&task_setup_data);
3017         if (IS_ERR(task))
3018                 return PTR_ERR(task);
3019         if (!issync)
3020                 goto out;
3021         status = nfs4_wait_for_completion_rpc_task(task);
3022         if (status != 0)
3023                 goto out;
3024         status = data->rpc_status;
3025         if (status != 0)
3026                 goto out;
3027         nfs_refresh_inode(inode, &data->fattr);
3028 out:
3029         rpc_put_task(task);
3030         return status;
3031 }
3032
3033 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3034 {
3035         struct nfs_server *server = NFS_SERVER(inode);
3036         struct nfs4_exception exception = { };
3037         int err;
3038         do {
3039                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3040                 switch (err) {
3041                         case -NFS4ERR_STALE_STATEID:
3042                         case -NFS4ERR_EXPIRED:
3043                         case 0:
3044                                 return 0;
3045                 }
3046                 err = nfs4_handle_exception(server, err, &exception);
3047         } while (exception.retry);
3048         return err;
3049 }
3050
3051 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3052 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3053
3054 /*
3055  * sleep, with exponential backoff, and retry the LOCK operation.
3056  */
3057 static unsigned long
3058 nfs4_set_lock_task_retry(unsigned long timeout)
3059 {
3060         schedule_timeout_killable(timeout);
3061         timeout <<= 1;
3062         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3063                 return NFS4_LOCK_MAXTIMEOUT;
3064         return timeout;
3065 }
3066
3067 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3068 {
3069         struct inode *inode = state->inode;
3070         struct nfs_server *server = NFS_SERVER(inode);
3071         struct nfs_client *clp = server->nfs_client;
3072         struct nfs_lockt_args arg = {
3073                 .fh = NFS_FH(inode),
3074                 .fl = request,
3075         };
3076         struct nfs_lockt_res res = {
3077                 .denied = request,
3078         };
3079         struct rpc_message msg = {
3080                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3081                 .rpc_argp       = &arg,
3082                 .rpc_resp       = &res,
3083                 .rpc_cred       = state->owner->so_cred,
3084         };
3085         struct nfs4_lock_state *lsp;
3086         int status;
3087
3088         down_read(&clp->cl_sem);
3089         arg.lock_owner.clientid = clp->cl_clientid;
3090         status = nfs4_set_lock_state(state, request);
3091         if (status != 0)
3092                 goto out;
3093         lsp = request->fl_u.nfs4_fl.owner;
3094         arg.lock_owner.id = lsp->ls_id.id;
3095         status = rpc_call_sync(server->client, &msg, 0);
3096         switch (status) {
3097                 case 0:
3098                         request->fl_type = F_UNLCK;
3099                         break;
3100                 case -NFS4ERR_DENIED:
3101                         status = 0;
3102         }
3103         request->fl_ops->fl_release_private(request);
3104 out:
3105         up_read(&clp->cl_sem);
3106         return status;
3107 }
3108
3109 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3110 {
3111         struct nfs4_exception exception = { };
3112         int err;
3113
3114         do {
3115                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3116                                 _nfs4_proc_getlk(state, cmd, request),
3117                                 &exception);
3118         } while (exception.retry);
3119         return err;
3120 }
3121
3122 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3123 {
3124         int res = 0;
3125         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3126                 case FL_POSIX:
3127                         res = posix_lock_file_wait(file, fl);
3128                         break;
3129                 case FL_FLOCK:
3130                         res = flock_lock_file_wait(file, fl);
3131                         break;
3132                 default:
3133                         BUG();
3134         }
3135         return res;
3136 }
3137
3138 struct nfs4_unlockdata {
3139         struct nfs_locku_args arg;
3140         struct nfs_locku_res res;
3141         struct nfs4_lock_state *lsp;
3142         struct nfs_open_context *ctx;
3143         struct file_lock fl;
3144         const struct nfs_server *server;
3145         unsigned long timestamp;
3146 };
3147
3148 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3149                 struct nfs_open_context *ctx,
3150                 struct nfs4_lock_state *lsp,
3151                 struct nfs_seqid *seqid)
3152 {
3153         struct nfs4_unlockdata *p;
3154         struct inode *inode = lsp->ls_state->inode;
3155
3156         p = kmalloc(sizeof(*p), GFP_KERNEL);
3157         if (p == NULL)
3158                 return NULL;
3159         p->arg.fh = NFS_FH(inode);
3160         p->arg.fl = &p->fl;
3161         p->arg.seqid = seqid;
3162         p->res.seqid = seqid;
3163         p->arg.stateid = &lsp->ls_stateid;
3164         p->lsp = lsp;
3165         atomic_inc(&lsp->ls_count);
3166         /* Ensure we don't close file until we're done freeing locks! */
3167         p->ctx = get_nfs_open_context(ctx);
3168         memcpy(&p->fl, fl, sizeof(p->fl));
3169         p->server = NFS_SERVER(inode);
3170         return p;
3171 }
3172
3173 static void nfs4_locku_release_calldata(void *data)
3174 {
3175         struct nfs4_unlockdata *calldata = data;
3176         nfs_free_seqid(calldata->arg.seqid);
3177         nfs4_put_lock_state(calldata->lsp);
3178         put_nfs_open_context(calldata->ctx);
3179         kfree(calldata);
3180 }
3181
3182 static void nfs4_locku_done(struct rpc_task *task, void *data)
3183 {
3184         struct nfs4_unlockdata *calldata = data;
3185
3186         if (RPC_ASSASSINATED(task))
3187                 return;
3188         switch (task->tk_status) {
3189                 case 0:
3190                         memcpy(calldata->lsp->ls_stateid.data,
3191                                         calldata->res.stateid.data,
3192                                         sizeof(calldata->lsp->ls_stateid.data));
3193                         renew_lease(calldata->server, calldata->timestamp);
3194                         break;
3195                 case -NFS4ERR_STALE_STATEID:
3196                 case -NFS4ERR_EXPIRED:
3197                         break;
3198                 default:
3199                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3200                                 rpc_restart_call(task);
3201         }
3202 }
3203
3204 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3205 {
3206         struct nfs4_unlockdata *calldata = data;
3207
3208         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3209                 return;
3210         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3211                 /* Note: exit _without_ running nfs4_locku_done */
3212                 task->tk_action = NULL;
3213                 return;
3214         }
3215         calldata->timestamp = jiffies;
3216         rpc_call_start(task);
3217 }
3218
3219 static const struct rpc_call_ops nfs4_locku_ops = {
3220         .rpc_call_prepare = nfs4_locku_prepare,
3221         .rpc_call_done = nfs4_locku_done,
3222         .rpc_release = nfs4_locku_release_calldata,
3223 };
3224
3225 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3226                 struct nfs_open_context *ctx,
3227                 struct nfs4_lock_state *lsp,
3228                 struct nfs_seqid *seqid)
3229 {
3230         struct nfs4_unlockdata *data;
3231         struct rpc_message msg = {
3232                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3233                 .rpc_cred = ctx->cred,
3234         };
3235         struct rpc_task_setup task_setup_data = {
3236                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3237                 .rpc_message = &msg,
3238                 .callback_ops = &nfs4_locku_ops,
3239                 .workqueue = nfsiod_workqueue,
3240                 .flags = RPC_TASK_ASYNC,
3241         };
3242
3243         /* Ensure this is an unlock - when canceling a lock, the
3244          * canceled lock is passed in, and it won't be an unlock.
3245          */
3246         fl->fl_type = F_UNLCK;
3247
3248         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3249         if (data == NULL) {
3250                 nfs_free_seqid(seqid);
3251                 return ERR_PTR(-ENOMEM);
3252         }
3253
3254         msg.rpc_argp = &data->arg,
3255         msg.rpc_resp = &data->res,
3256         task_setup_data.callback_data = data;
3257         return rpc_run_task(&task_setup_data);
3258 }
3259
3260 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3261 {
3262         struct nfs_seqid *seqid;
3263         struct nfs4_lock_state *lsp;
3264         struct rpc_task *task;
3265         int status = 0;
3266
3267         status = nfs4_set_lock_state(state, request);
3268         /* Unlock _before_ we do the RPC call */
3269         request->fl_flags |= FL_EXISTS;
3270         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3271                 goto out;
3272         if (status != 0)
3273                 goto out;
3274         /* Is this a delegated lock? */
3275         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3276                 goto out;
3277         lsp = request->fl_u.nfs4_fl.owner;
3278         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3279         status = -ENOMEM;
3280         if (seqid == NULL)
3281                 goto out;
3282         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3283         status = PTR_ERR(task);
3284         if (IS_ERR(task))
3285                 goto out;
3286         status = nfs4_wait_for_completion_rpc_task(task);
3287         rpc_put_task(task);
3288 out:
3289         return status;
3290 }
3291
3292 struct nfs4_lockdata {
3293         struct nfs_lock_args arg;
3294         struct nfs_lock_res res;
3295         struct nfs4_lock_state *lsp;
3296         struct nfs_open_context *ctx;
3297         struct file_lock fl;
3298         unsigned long timestamp;
3299         int rpc_status;
3300         int cancelled;
3301 };
3302
3303 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3304                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3305 {
3306         struct nfs4_lockdata *p;
3307         struct inode *inode = lsp->ls_state->inode;
3308         struct nfs_server *server = NFS_SERVER(inode);
3309
3310         p = kzalloc(sizeof(*p), GFP_KERNEL);
3311         if (p == NULL)
3312                 return NULL;
3313
3314         p->arg.fh = NFS_FH(inode);
3315         p->arg.fl = &p->fl;
3316         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3317         if (p->arg.open_seqid == NULL)
3318                 goto out_free;
3319         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3320         if (p->arg.lock_seqid == NULL)
3321                 goto out_free_seqid;
3322         p->arg.lock_stateid = &lsp->ls_stateid;
3323         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3324         p->arg.lock_owner.id = lsp->ls_id.id;
3325         p->res.lock_seqid = p->arg.lock_seqid;
3326         p->lsp = lsp;
3327         atomic_inc(&lsp->ls_count);
3328         p->ctx = get_nfs_open_context(ctx);
3329         memcpy(&p->fl, fl, sizeof(p->fl));
3330         return p;
3331 out_free_seqid:
3332         nfs_free_seqid(p->arg.open_seqid);
3333 out_free:
3334         kfree(p);
3335         return NULL;
3336 }
3337
3338 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3339 {
3340         struct nfs4_lockdata *data = calldata;
3341         struct nfs4_state *state = data->lsp->ls_state;
3342
3343         dprintk("%s: begin!\n", __FUNCTION__);
3344         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3345                 return;
3346         /* Do we need to do an open_to_lock_owner? */
3347         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3348                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3349                         return;
3350                 data->arg.open_stateid = &state->stateid;
3351                 data->arg.new_lock_owner = 1;
3352                 data->res.open_seqid = data->arg.open_seqid;
3353         } else
3354                 data->arg.new_lock_owner = 0;
3355         data->timestamp = jiffies;
3356         rpc_call_start(task);
3357         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3358 }
3359
3360 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3361 {
3362         struct nfs4_lockdata *data = calldata;
3363
3364         dprintk("%s: begin!\n", __FUNCTION__);
3365
3366         data->rpc_status = task->tk_status;
3367         if (RPC_ASSASSINATED(task))
3368                 goto out;
3369         if (data->arg.new_lock_owner != 0) {
3370                 if (data->rpc_status == 0)
3371                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3372                 else
3373                         goto out;
3374         }
3375         if (data->rpc_status == 0) {
3376                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3377                                         sizeof(data->lsp->ls_stateid.data));
3378                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3379                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3380         }
3381 out:
3382         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3383 }
3384
3385 static void nfs4_lock_release(void *calldata)
3386 {
3387         struct nfs4_lockdata *data = calldata;
3388
3389         dprintk("%s: begin!\n", __FUNCTION__);
3390         nfs_free_seqid(data->arg.open_seqid);
3391         if (data->cancelled != 0) {
3392                 struct rpc_task *task;
3393                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3394                                 data->arg.lock_seqid);
3395                 if (!IS_ERR(task))
3396                         rpc_put_task(task);
3397                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3398         } else
3399                 nfs_free_seqid(data->arg.lock_seqid);
3400         nfs4_put_lock_state(data->lsp);
3401         put_nfs_open_context(data->ctx);
3402         kfree(data);
3403         dprintk("%s: done!\n", __FUNCTION__);
3404 }
3405
3406 static const struct rpc_call_ops nfs4_lock_ops = {
3407         .rpc_call_prepare = nfs4_lock_prepare,
3408         .rpc_call_done = nfs4_lock_done,
3409         .rpc_release = nfs4_lock_release,
3410 };
3411
3412 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3413 {
3414         struct nfs4_lockdata *data;
3415         struct rpc_task *task;
3416         struct rpc_message msg = {
3417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3418                 .rpc_cred = state->owner->so_cred,
3419         };
3420         struct rpc_task_setup task_setup_data = {
3421                 .rpc_client = NFS_CLIENT(state->inode),
3422                 .rpc_message = &msg,
3423                 .callback_ops = &nfs4_lock_ops,
3424                 .workqueue = nfsiod_workqueue,
3425                 .flags = RPC_TASK_ASYNC,
3426         };
3427         int ret;
3428
3429         dprintk("%s: begin!\n", __FUNCTION__);
3430         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3431                         fl->fl_u.nfs4_fl.owner);
3432         if (data == NULL)
3433                 return -ENOMEM;
3434         if (IS_SETLKW(cmd))
3435                 data->arg.block = 1;
3436         if (reclaim != 0)
3437                 data->arg.reclaim = 1;
3438         msg.rpc_argp = &data->arg,
3439         msg.rpc_resp = &data->res,
3440         task_setup_data.callback_data = data;
3441         task = rpc_run_task(&task_setup_data);
3442         if (IS_ERR(task))
3443                 return PTR_ERR(task);
3444         ret = nfs4_wait_for_completion_rpc_task(task);
3445         if (ret == 0) {
3446                 ret = data->rpc_status;
3447                 if (ret == -NFS4ERR_DENIED)
3448                         ret = -EAGAIN;
3449         } else
3450                 data->cancelled = 1;
3451         rpc_put_task(task);
3452         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3453         return ret;
3454 }
3455
3456 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3457 {
3458         struct nfs_server *server = NFS_SERVER(state->inode);
3459         struct nfs4_exception exception = { };
3460         int err;
3461
3462         do {
3463                 /* Cache the lock if possible... */
3464                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3465                         return 0;
3466                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3467                 if (err != -NFS4ERR_DELAY)
3468                         break;
3469                 nfs4_handle_exception(server, err, &exception);
3470         } while (exception.retry);
3471         return err;
3472 }
3473
3474 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3475 {
3476         struct nfs_server *server = NFS_SERVER(state->inode);
3477         struct nfs4_exception exception = { };
3478         int err;
3479
3480         err = nfs4_set_lock_state(state, request);
3481         if (err != 0)
3482                 return err;
3483         do {
3484                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3485                         return 0;
3486                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3487                 if (err != -NFS4ERR_DELAY)
3488                         break;
3489                 nfs4_handle_exception(server, err, &exception);
3490         } while (exception.retry);
3491         return err;
3492 }
3493
3494 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3495 {
3496         struct nfs_client *clp = state->owner->so_client;
3497         unsigned char fl_flags = request->fl_flags;
3498         int status;
3499
3500         /* Is this a delegated open? */
3501         status = nfs4_set_lock_state(state, request);
3502         if (status != 0)
3503                 goto out;
3504         request->fl_flags |= FL_ACCESS;
3505         status = do_vfs_lock(request->fl_file, request);
3506         if (status < 0)
3507                 goto out;
3508         down_read(&clp->cl_sem);
3509         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3510                 struct nfs_inode *nfsi = NFS_I(state->inode);
3511                 /* Yes: cache locks! */
3512                 down_read(&nfsi->rwsem);
3513                 /* ...but avoid races with delegation recall... */
3514                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3515                         request->fl_flags = fl_flags & ~FL_SLEEP;
3516                         status = do_vfs_lock(request->fl_file, request);
3517                         up_read(&nfsi->rwsem);
3518                         goto out_unlock;
3519                 }
3520                 up_read(&nfsi->rwsem);
3521         }
3522         status = _nfs4_do_setlk(state, cmd, request, 0);
3523         if (status != 0)
3524                 goto out_unlock;
3525         /* Note: we always want to sleep here! */
3526         request->fl_flags = fl_flags | FL_SLEEP;
3527         if (do_vfs_lock(request->fl_file, request) < 0)
3528                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3529 out_unlock:
3530         up_read(&clp->cl_sem);
3531 out:
3532         request->fl_flags = fl_flags;
3533         return status;
3534 }
3535
3536 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3537 {
3538         struct nfs4_exception exception = { };
3539         int err;
3540
3541         do {
3542                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3543                                 _nfs4_proc_setlk(state, cmd, request),
3544                                 &exception);
3545         } while (exception.retry);
3546         return err;
3547 }
3548
3549 static int
3550 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3551 {
3552         struct nfs_open_context *ctx;
3553         struct nfs4_state *state;
3554         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3555         int status;
3556
3557         /* verify open state */
3558         ctx = nfs_file_open_context(filp);
3559         state = ctx->state;
3560
3561         if (request->fl_start < 0 || request->fl_end < 0)
3562                 return -EINVAL;
3563
3564         if (IS_GETLK(cmd))
3565                 return nfs4_proc_getlk(state, F_GETLK, request);
3566
3567         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3568                 return -EINVAL;
3569
3570         if (request->fl_type == F_UNLCK)
3571                 return nfs4_proc_unlck(state, cmd, request);
3572
3573         do {
3574                 status = nfs4_proc_setlk(state, cmd, request);
3575                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3576                         break;
3577                 timeout = nfs4_set_lock_task_retry(timeout);
3578                 status = -ERESTARTSYS;
3579                 if (signalled())
3580                         break;
3581         } while(status < 0);
3582         return status;
3583 }
3584
3585 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3586 {
3587         struct nfs_server *server = NFS_SERVER(state->inode);
3588         struct nfs4_exception exception = { };
3589         int err;
3590
3591         err = nfs4_set_lock_state(state, fl);
3592         if (err != 0)
3593                 goto out;
3594         do {
3595                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3596                 if (err != -NFS4ERR_DELAY)
3597                         break;
3598                 err = nfs4_handle_exception(server, err, &exception);
3599         } while (exception.retry);
3600 out:
3601         return err;
3602 }
3603
3604 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3605
3606 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3607                 size_t buflen, int flags)
3608 {
3609         struct inode *inode = dentry->d_inode;
3610
3611         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3612                 return -EOPNOTSUPP;
3613
3614         return nfs4_proc_set_acl(inode, buf, buflen);
3615 }
3616
3617 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3618  * and that's what we'll do for e.g. user attributes that haven't been set.
3619  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3620  * attributes in kernel-managed attribute namespaces. */
3621 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3622                 size_t buflen)
3623 {
3624         struct inode *inode = dentry->d_inode;
3625
3626         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3627                 return -EOPNOTSUPP;
3628
3629         return nfs4_proc_get_acl(inode, buf, buflen);
3630 }
3631
3632 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3633 {
3634         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3635
3636         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3637                 return 0;
3638         if (buf && buflen < len)
3639                 return -ERANGE;
3640         if (buf)
3641                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3642         return len;
3643 }
3644
3645 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3646                 struct nfs4_fs_locations *fs_locations, struct page *page)
3647 {
3648         struct nfs_server *server = NFS_SERVER(dir);
3649         u32 bitmask[2] = {
3650                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3651                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3652         };
3653         struct nfs4_fs_locations_arg args = {
3654                 .dir_fh = NFS_FH(dir),
3655                 .name = name,
3656                 .page = page,
3657                 .bitmask = bitmask,
3658         };
3659         struct rpc_message msg = {
3660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3661                 .rpc_argp = &args,
3662                 .rpc_resp = fs_locations,
3663         };
3664         int status;
3665
3666         dprintk("%s: start\n", __FUNCTION__);
3667         nfs_fattr_init(&fs_locations->fattr);
3668         fs_locations->server = server;
3669         fs_locations->nlocations = 0;
3670         status = rpc_call_sync(server->client, &msg, 0);
3671         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3672         return status;
3673 }
3674
3675 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3676         .recover_open   = nfs4_open_reclaim,
3677         .recover_lock   = nfs4_lock_reclaim,
3678 };
3679
3680 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3681         .recover_open   = nfs4_open_expired,
3682         .recover_lock   = nfs4_lock_expired,
3683 };
3684
3685 static const struct inode_operations nfs4_file_inode_operations = {
3686         .permission     = nfs_permission,
3687         .getattr        = nfs_getattr,
3688         .setattr        = nfs_setattr,
3689         .getxattr       = nfs4_getxattr,
3690         .setxattr       = nfs4_setxattr,
3691         .listxattr      = nfs4_listxattr,
3692 };
3693
3694 const struct nfs_rpc_ops nfs_v4_clientops = {
3695         .version        = 4,                    /* protocol version */
3696         .dentry_ops     = &nfs4_dentry_operations,
3697         .dir_inode_ops  = &nfs4_dir_inode_operations,
3698         .file_inode_ops = &nfs4_file_inode_operations,
3699         .getroot        = nfs4_proc_get_root,
3700         .getattr        = nfs4_proc_getattr,
3701         .setattr        = nfs4_proc_setattr,
3702         .lookupfh       = nfs4_proc_lookupfh,
3703         .lookup         = nfs4_proc_lookup,
3704         .access         = nfs4_proc_access,
3705         .readlink       = nfs4_proc_readlink,
3706         .create         = nfs4_proc_create,
3707         .remove         = nfs4_proc_remove,
3708         .unlink_setup   = nfs4_proc_unlink_setup,
3709         .unlink_done    = nfs4_proc_unlink_done,
3710         .rename         = nfs4_proc_rename,
3711         .link           = nfs4_proc_link,
3712         .symlink        = nfs4_proc_symlink,
3713         .mkdir          = nfs4_proc_mkdir,
3714         .rmdir          = nfs4_proc_remove,
3715         .readdir        = nfs4_proc_readdir,
3716         .mknod          = nfs4_proc_mknod,
3717         .statfs         = nfs4_proc_statfs,
3718         .fsinfo         = nfs4_proc_fsinfo,
3719         .pathconf       = nfs4_proc_pathconf,
3720         .set_capabilities = nfs4_server_capabilities,
3721         .decode_dirent  = nfs4_decode_dirent,
3722         .read_setup     = nfs4_proc_read_setup,
3723         .read_done      = nfs4_read_done,
3724         .write_setup    = nfs4_proc_write_setup,
3725         .write_done     = nfs4_write_done,
3726         .commit_setup   = nfs4_proc_commit_setup,
3727         .commit_done    = nfs4_commit_done,
3728         .file_open      = nfs_open,
3729         .file_release   = nfs_release,
3730         .lock           = nfs4_proc_lock,
3731         .clear_acl_cache = nfs4_zap_acl_attr,
3732 };
3733
3734 /*
3735  * Local variables:
3736  *  c-basic-offset: 8
3737  * End:
3738  */