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 "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         u32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 197 {
 198         struct nfs_client *clp = server->nfs_client;
 199         spin_lock(&clp->cl_lock);
 200         if (time_before(clp->cl_last_renewal,timestamp))
 201                 clp->cl_last_renewal = timestamp;
 202         spin_unlock(&clp->cl_lock);
 203 }
 204
 205 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 206 {
 207         struct nfs_inode *nfsi = NFS_I(dir);
 208
 209         spin_lock(&dir->i_lock);
 210         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 211         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 212                 nfsi->change_attr = cinfo->after;
 213         spin_unlock(&dir->i_lock);
 214 }
 215
 216 struct nfs4_opendata {
 217         atomic_t count;
 218         struct nfs_openargs o_arg;
 219         struct nfs_openres o_res;
 220         struct nfs_open_confirmargs c_arg;
 221         struct nfs_open_confirmres c_res;
 222         struct nfs_fattr f_attr;
 223         struct nfs_fattr dir_attr;
 224         struct dentry *dentry;
 225         struct dentry *dir;
 226         struct nfs4_state_owner *owner;
 227         struct iattr attrs;
 228         unsigned long timestamp;
 229         int rpc_status;
 230         int cancelled;
 231 };
 232
 233 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 234                 struct nfs4_state_owner *sp, int flags,
 235                 const struct iattr *attrs)
 236 {
 237         struct dentry *parent = dget_parent(dentry);
 238         struct inode *dir = parent->d_inode;
 239         struct nfs_server *server = NFS_SERVER(dir);
 240         struct nfs4_opendata *p;
 241
 242         p = kzalloc(sizeof(*p), GFP_KERNEL);
 243         if (p == NULL)
 244                 goto err;
 245         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 246         if (p->o_arg.seqid == NULL)
 247                 goto err_free;
 248         atomic_set(&p->count, 1);
 249         p->dentry = dget(dentry);
 250         p->dir = parent;
 251         p->owner = sp;
 252         atomic_inc(&sp->so_count);
 253         p->o_arg.fh = NFS_FH(dir);
 254         p->o_arg.open_flags = flags,
 255         p->o_arg.clientid = server->nfs_client->cl_clientid;
 256         p->o_arg.id = sp->so_id;
 257         p->o_arg.name = &dentry->d_name;
 258         p->o_arg.server = server;
 259         p->o_arg.bitmask = server->attr_bitmask;
 260         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 261         p->o_res.f_attr = &p->f_attr;
 262         p->o_res.dir_attr = &p->dir_attr;
 263         p->o_res.server = server;
 264         nfs_fattr_init(&p->f_attr);
 265         nfs_fattr_init(&p->dir_attr);
 266         if (flags & O_EXCL) {
 267                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 268                 s[0] = jiffies;
 269                 s[1] = current->pid;
 270         } else if (flags & O_CREAT) {
 271                 p->o_arg.u.attrs = &p->attrs;
 272                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 273         }
 274         p->c_arg.fh = &p->o_res.fh;
 275         p->c_arg.stateid = &p->o_res.stateid;
 276         p->c_arg.seqid = p->o_arg.seqid;
 277         return p;
 278 err_free:
 279         kfree(p);
 280 err:
 281         dput(parent);
 282         return NULL;
 283 }
 284
 285 static void nfs4_opendata_free(struct nfs4_opendata *p)
 286 {
 287         if (p != NULL && atomic_dec_and_test(&p->count)) {
 288                 nfs_free_seqid(p->o_arg.seqid);
 289                 nfs4_put_state_owner(p->owner);
 290                 dput(p->dir);
 291                 dput(p->dentry);
 292                 kfree(p);
 293         }
 294 }
 295
 296 /* Helper for asynchronous RPC calls */
 297 static int nfs4_call_async(struct rpc_clnt *clnt,
 298                 const struct rpc_call_ops *tk_ops, void *calldata)
 299 {
 300         struct rpc_task *task;
 301
 302         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 303                 return -ENOMEM;
 304         rpc_execute(task);
 305         return 0;
 306 }
 307
 308 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 309 {
 310         sigset_t oldset;
 311         int ret;
 312
 313         rpc_clnt_sigmask(task->tk_client, &oldset);
 314         ret = rpc_wait_for_completion_task(task);
 315         rpc_clnt_sigunmask(task->tk_client, &oldset);
 316         return ret;
 317 }
 318
 319 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 320 {
 321         switch (open_flags) {
 322                 case FMODE_WRITE:
 323                         state->n_wronly++;
 324                         break;
 325                 case FMODE_READ:
 326                         state->n_rdonly++;
 327                         break;
 328                 case FMODE_READ|FMODE_WRITE:
 329                         state->n_rdwr++;
 330         }
 331 }
 332
 333 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 334 {
 335         struct inode *inode = state->inode;
 336
 337         open_flags &= (FMODE_READ|FMODE_WRITE);
 338         /* Protect against nfs4_find_state_byowner() */
 339         spin_lock(&state->owner->so_lock);
 340         spin_lock(&inode->i_lock);
 341         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 342         update_open_stateflags(state, open_flags);
 343         nfs4_state_set_mode_locked(state, state->state | open_flags);
 344         spin_unlock(&inode->i_lock);
 345         spin_unlock(&state->owner->so_lock);
 346 }
 347
 348 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 349 {
 350         struct inode *inode;
 351         struct nfs4_state *state = NULL;
 352
 353         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 354                 goto out;
 355         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 356         if (IS_ERR(inode))
 357                 goto out;
 358         state = nfs4_get_open_state(inode, data->owner);
 359         if (state == NULL)
 360                 goto put_inode;
 361         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 362 put_inode:
 363         iput(inode);
 364 out:
 365         return state;
 366 }
 367
 368 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 369 {
 370         struct nfs_inode *nfsi = NFS_I(state->inode);
 371         struct nfs_open_context *ctx;
 372
 373         spin_lock(&state->inode->i_lock);
 374         list_for_each_entry(ctx, &nfsi->open_files, list) {
 375                 if (ctx->state != state)
 376                         continue;
 377                 get_nfs_open_context(ctx);
 378                 spin_unlock(&state->inode->i_lock);
 379                 return ctx;
 380         }
 381         spin_unlock(&state->inode->i_lock);
 382         return ERR_PTR(-ENOENT);
 383 }
 384
 385 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 386 {
 387         int ret;
 388
 389         opendata->o_arg.open_flags = openflags;
 390         ret = _nfs4_proc_open(opendata);
 391         if (ret != 0)
 392                 return ret;
 393         memcpy(stateid->data, opendata->o_res.stateid.data,
 394                         sizeof(stateid->data));
 395         return 0;
 396 }
 397
 398 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 399 {
 400         nfs4_stateid stateid;
 401         struct nfs4_state *newstate;
 402         int mode = 0;
 403         int delegation = 0;
 404         int ret;
 405
 406         /* memory barrier prior to reading state->n_* */
 407         smp_rmb();
 408         if (state->n_rdwr != 0) {
 409                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 410                 if (ret != 0)
 411                         return ret;
 412                 mode |= FMODE_READ|FMODE_WRITE;
 413                 if (opendata->o_res.delegation_type != 0)
 414                         delegation = opendata->o_res.delegation_type;
 415                 smp_rmb();
 416         }
 417         if (state->n_wronly != 0) {
 418                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 419                 if (ret != 0)
 420                         return ret;
 421                 mode |= FMODE_WRITE;
 422                 if (opendata->o_res.delegation_type != 0)
 423                         delegation = opendata->o_res.delegation_type;
 424                 smp_rmb();
 425         }
 426         if (state->n_rdonly != 0) {
 427                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 428                 if (ret != 0)
 429                         return ret;
 430                 mode |= FMODE_READ;
 431         }
 432         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 433         if (mode == 0)
 434                 return 0;
 435         if (opendata->o_res.delegation_type == 0)
 436                 opendata->o_res.delegation_type = delegation;
 437         opendata->o_arg.open_flags |= mode;
 438         newstate = nfs4_opendata_to_nfs4_state(opendata);
 439         if (newstate != NULL) {
 440                 if (opendata->o_res.delegation_type != 0) {
 441                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 442                         int delegation_flags = 0;
 443                         if (nfsi->delegation)
 444                                 delegation_flags = nfsi->delegation->flags;
 445                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 446                                 nfs_inode_set_delegation(newstate->inode,
 447                                                 opendata->owner->so_cred,
 448                                                 &opendata->o_res);
 449                         else
 450                                 nfs_inode_reclaim_delegation(newstate->inode,
 451                                                 opendata->owner->so_cred,
 452                                                 &opendata->o_res);
 453                 }
 454                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 455         }
 456         if (newstate != state)
 457                 return -ESTALE;
 458         return 0;
 459 }
 460
 461 /*
 462  * OPEN_RECLAIM:
 463  *      reclaim state on the server after a reboot.
 464  */
 465 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 466 {
 467         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 468         struct nfs4_opendata *opendata;
 469         int delegation_type = 0;
 470         int status;
 471
 472         if (delegation != NULL) {
 473                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 474                         memcpy(&state->stateid, &delegation->stateid,
 475                                         sizeof(state->stateid));
 476                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 477                         return 0;
 478                 }
 479                 delegation_type = delegation->type;
 480         }
 481         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 482         if (opendata == NULL)
 483                 return -ENOMEM;
 484         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 485         opendata->o_arg.fh = NFS_FH(state->inode);
 486         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 487         opendata->o_arg.u.delegation_type = delegation_type;
 488         status = nfs4_open_recover(opendata, state);
 489         nfs4_opendata_free(opendata);
 490         return status;
 491 }
 492
 493 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 494 {
 495         struct nfs_server *server = NFS_SERVER(state->inode);
 496         struct nfs4_exception exception = { };
 497         int err;
 498         do {
 499                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 500                 if (err != -NFS4ERR_DELAY)
 501                         break;
 502                 nfs4_handle_exception(server, err, &exception);
 503         } while (exception.retry);
 504         return err;
 505 }
 506
 507 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 508 {
 509         struct nfs_open_context *ctx;
 510         int ret;
 511
 512         ctx = nfs4_state_find_open_context(state);
 513         if (IS_ERR(ctx))
 514                 return PTR_ERR(ctx);
 515         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 516         put_nfs_open_context(ctx);
 517         return ret;
 518 }
 519
 520 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 521 {
 522         struct nfs4_state_owner  *sp  = state->owner;
 523         struct nfs4_opendata *opendata;
 524         int ret;
 525
 526         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 527                 return 0;
 528         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 529         if (opendata == NULL)
 530                 return -ENOMEM;
 531         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 532         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 533                         sizeof(opendata->o_arg.u.delegation.data));
 534         ret = nfs4_open_recover(opendata, state);
 535         nfs4_opendata_free(opendata);
 536         return ret;
 537 }
 538
 539 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 540 {
 541         struct nfs4_exception exception = { };
 542         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 543         int err;
 544         do {
 545                 err = _nfs4_open_delegation_recall(dentry, state);
 546                 switch (err) {
 547                         case 0:
 548                                 return err;
 549                         case -NFS4ERR_STALE_CLIENTID:
 550                         case -NFS4ERR_STALE_STATEID:
 551                         case -NFS4ERR_EXPIRED:
 552                                 /* Don't recall a delegation if it was lost */
 553                                 nfs4_schedule_state_recovery(server->nfs_client);
 554                                 return err;
 555                 }
 556                 err = nfs4_handle_exception(server, err, &exception);
 557         } while (exception.retry);
 558         return err;
 559 }
 560
 561 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 562 {
 563         struct nfs4_opendata *data = calldata;
 564         struct  rpc_message msg = {
 565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 566                 .rpc_argp = &data->c_arg,
 567                 .rpc_resp = &data->c_res,
 568                 .rpc_cred = data->owner->so_cred,
 569         };
 570         data->timestamp = jiffies;
 571         rpc_call_setup(task, &msg, 0);
 572 }
 573
 574 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 575 {
 576         struct nfs4_opendata *data = calldata;
 577
 578         data->rpc_status = task->tk_status;
 579         if (RPC_ASSASSINATED(task))
 580                 return;
 581         if (data->rpc_status == 0) {
 582                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 583                                 sizeof(data->o_res.stateid.data));
 584                 renew_lease(data->o_res.server, data->timestamp);
 585         }
 586         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 587         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 588 }
 589
 590 static void nfs4_open_confirm_release(void *calldata)
 591 {
 592         struct nfs4_opendata *data = calldata;
 593         struct nfs4_state *state = NULL;
 594
 595         /* If this request hasn't been cancelled, do nothing */
 596         if (data->cancelled == 0)
 597                 goto out_free;
 598         /* In case of error, no cleanup! */
 599         if (data->rpc_status != 0)
 600                 goto out_free;
 601         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 602         state = nfs4_opendata_to_nfs4_state(data);
 603         if (state != NULL)
 604                 nfs4_close_state(state, data->o_arg.open_flags);
 605 out_free:
 606         nfs4_opendata_free(data);
 607 }
 608
 609 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 610         .rpc_call_prepare = nfs4_open_confirm_prepare,
 611         .rpc_call_done = nfs4_open_confirm_done,
 612         .rpc_release = nfs4_open_confirm_release,
 613 };
 614
 615 /*
 616  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 617  */
 618 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 619 {
 620         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 621         struct rpc_task *task;
 622         int status;
 623
 624         atomic_inc(&data->count);
 625         /*
 626          * If rpc_run_task() ends up calling ->rpc_release(), we
 627          * want to ensure that it takes the 'error' code path.
 628          */
 629         data->rpc_status = -ENOMEM;
 630         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 631         if (IS_ERR(task))
 632                 return PTR_ERR(task);
 633         status = nfs4_wait_for_completion_rpc_task(task);
 634         if (status != 0) {
 635                 data->cancelled = 1;
 636                 smp_wmb();
 637         } else
 638                 status = data->rpc_status;
 639         rpc_release_task(task);
 640         return status;
 641 }
 642
 643 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 644 {
 645         struct nfs4_opendata *data = calldata;
 646         struct nfs4_state_owner *sp = data->owner;
 647         struct rpc_message msg = {
 648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 649                 .rpc_argp = &data->o_arg,
 650                 .rpc_resp = &data->o_res,
 651                 .rpc_cred = sp->so_cred,
 652         };
 653
 654         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 655                 return;
 656         /* Update sequence id. */
 657         data->o_arg.id = sp->so_id;
 658         data->o_arg.clientid = sp->so_client->cl_clientid;
 659         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 660                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 661         data->timestamp = jiffies;
 662         rpc_call_setup(task, &msg, 0);
 663 }
 664
 665 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 666 {
 667         struct nfs4_opendata *data = calldata;
 668
 669         data->rpc_status = task->tk_status;
 670         if (RPC_ASSASSINATED(task))
 671                 return;
 672         if (task->tk_status == 0) {
 673                 switch (data->o_res.f_attr->mode & S_IFMT) {
 674                         case S_IFREG:
 675                                 break;
 676                         case S_IFLNK:
 677                                 data->rpc_status = -ELOOP;
 678                                 break;
 679                         case S_IFDIR:
 680                                 data->rpc_status = -EISDIR;
 681                                 break;
 682                         default:
 683                                 data->rpc_status = -ENOTDIR;
 684                 }
 685                 renew_lease(data->o_res.server, data->timestamp);
 686         }
 687         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 688 }
 689
 690 static void nfs4_open_release(void *calldata)
 691 {
 692         struct nfs4_opendata *data = calldata;
 693         struct nfs4_state *state = NULL;
 694
 695         /* If this request hasn't been cancelled, do nothing */
 696         if (data->cancelled == 0)
 697                 goto out_free;
 698         /* In case of error, no cleanup! */
 699         if (data->rpc_status != 0)
 700                 goto out_free;
 701         /* In case we need an open_confirm, no cleanup! */
 702         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 703                 goto out_free;
 704         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 705         state = nfs4_opendata_to_nfs4_state(data);
 706         if (state != NULL)
 707                 nfs4_close_state(state, data->o_arg.open_flags);
 708 out_free:
 709         nfs4_opendata_free(data);
 710 }
 711
 712 static const struct rpc_call_ops nfs4_open_ops = {
 713         .rpc_call_prepare = nfs4_open_prepare,
 714         .rpc_call_done = nfs4_open_done,
 715         .rpc_release = nfs4_open_release,
 716 };
 717
 718 /*
 719  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 720  */
 721 static int _nfs4_proc_open(struct nfs4_opendata *data)
 722 {
 723         struct inode *dir = data->dir->d_inode;
 724         struct nfs_server *server = NFS_SERVER(dir);
 725         struct nfs_openargs *o_arg = &data->o_arg;
 726         struct nfs_openres *o_res = &data->o_res;
 727         struct rpc_task *task;
 728         int status;
 729
 730         atomic_inc(&data->count);
 731         /*
 732          * If rpc_run_task() ends up calling ->rpc_release(), we
 733          * want to ensure that it takes the 'error' code path.
 734          */
 735         data->rpc_status = -ENOMEM;
 736         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 737         if (IS_ERR(task))
 738                 return PTR_ERR(task);
 739         status = nfs4_wait_for_completion_rpc_task(task);
 740         if (status != 0) {
 741                 data->cancelled = 1;
 742                 smp_wmb();
 743         } else
 744                 status = data->rpc_status;
 745         rpc_release_task(task);
 746         if (status != 0)
 747                 return status;
 748
 749         if (o_arg->open_flags & O_CREAT) {
 750                 update_changeattr(dir, &o_res->cinfo);
 751                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 752         } else
 753                 nfs_refresh_inode(dir, o_res->dir_attr);
 754         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 755                 status = _nfs4_proc_open_confirm(data);
 756                 if (status != 0)
 757                         return status;
 758         }
 759         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 760         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 761                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 762         return 0;
 763 }
 764
 765 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 766 {
 767         struct nfs_access_entry cache;
 768         int mask = 0;
 769         int status;
 770
 771         if (openflags & FMODE_READ)
 772                 mask |= MAY_READ;
 773         if (openflags & FMODE_WRITE)
 774                 mask |= MAY_WRITE;
 775         status = nfs_access_get_cached(inode, cred, &cache);
 776         if (status == 0)
 777                 goto out;
 778
 779         /* Be clever: ask server to check for all possible rights */
 780         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 781         cache.cred = cred;
 782         cache.jiffies = jiffies;
 783         status = _nfs4_proc_access(inode, &cache);
 784         if (status != 0)
 785                 return status;
 786         nfs_access_add_cache(inode, &cache);
 787 out:
 788         if ((cache.mask & mask) == mask)
 789                 return 0;
 790         return -EACCES;
 791 }
 792
 793 int nfs4_recover_expired_lease(struct nfs_server *server)
 794 {
 795         struct nfs_client *clp = server->nfs_client;
 796
 797         if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 798                 nfs4_schedule_state_recovery(clp);
 799         return nfs4_wait_clnt_recover(server->client, clp);
 800 }
 801
 802 /*
 803  * OPEN_EXPIRED:
 804  *      reclaim state on the server after a network partition.
 805  *      Assumes caller holds the appropriate lock
 806  */
 807 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 808 {
 809         struct inode *inode = state->inode;
 810         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 811         struct nfs4_opendata *opendata;
 812         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 813         int ret;
 814
 815         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 816                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 817                 if (ret < 0)
 818                         return ret;
 819                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 820                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 821                 return 0;
 822         }
 823         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 824         if (opendata == NULL)
 825                 return -ENOMEM;
 826         ret = nfs4_open_recover(opendata, state);
 827         if (ret == -ESTALE) {
 828                 /* Invalidate the state owner so we don't ever use it again */
 829                 nfs4_drop_state_owner(sp);
 830                 d_drop(dentry);
 831         }
 832         nfs4_opendata_free(opendata);
 833         return ret;
 834 }
 835
 836 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 837 {
 838         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 839         struct nfs4_exception exception = { };
 840         int err;
 841
 842         do {
 843                 err = _nfs4_open_expired(sp, state, dentry);
 844                 if (err == -NFS4ERR_DELAY)
 845                         nfs4_handle_exception(server, err, &exception);
 846         } while (exception.retry);
 847         return err;
 848 }
 849
 850 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 851 {
 852         struct nfs_open_context *ctx;
 853         int ret;
 854
 855         ctx = nfs4_state_find_open_context(state);
 856         if (IS_ERR(ctx))
 857                 return PTR_ERR(ctx);
 858         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 859         put_nfs_open_context(ctx);
 860         return ret;
 861 }
 862
 863 /*
 864  * Returns a referenced nfs4_state if there is an open delegation on the file
 865  */
 866 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 867 {
 868         struct nfs_delegation *delegation;
 869         struct nfs_server *server = NFS_SERVER(inode);
 870         struct nfs_client *clp = server->nfs_client;
 871         struct nfs_inode *nfsi = NFS_I(inode);
 872         struct nfs4_state_owner *sp = NULL;
 873         struct nfs4_state *state = NULL;
 874         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 875         int err;
 876
 877         err = -ENOMEM;
 878         if (!(sp = nfs4_get_state_owner(server, cred))) {
 879                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 880                 return err;
 881         }
 882         err = nfs4_recover_expired_lease(server);
 883         if (err != 0)
 884                 goto out_put_state_owner;
 885         /* Protect against reboot recovery - NOTE ORDER! */
 886         down_read(&clp->cl_sem);
 887         /* Protect against delegation recall */
 888         down_read(&nfsi->rwsem);
 889         delegation = NFS_I(inode)->delegation;
 890         err = -ENOENT;
 891         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 892                 goto out_err;
 893         err = -ENOMEM;
 894         state = nfs4_get_open_state(inode, sp);
 895         if (state == NULL)
 896                 goto out_err;
 897
 898         err = -ENOENT;
 899         if ((state->state & open_flags) == open_flags) {
 900                 spin_lock(&inode->i_lock);
 901                 update_open_stateflags(state, open_flags);
 902                 spin_unlock(&inode->i_lock);
 903                 goto out_ok;
 904         } else if (state->state != 0)
 905                 goto out_put_open_state;
 906
 907         lock_kernel();
 908         err = _nfs4_do_access(inode, cred, open_flags);
 909         unlock_kernel();
 910         if (err != 0)
 911                 goto out_put_open_state;
 912         set_bit(NFS_DELEGATED_STATE, &state->flags);
 913         update_open_stateid(state, &delegation->stateid, open_flags);
 914 out_ok:
 915         nfs4_put_state_owner(sp);
 916         up_read(&nfsi->rwsem);
 917         up_read(&clp->cl_sem);
 918         *res = state;
 919         return 0;
 920 out_put_open_state:
 921         nfs4_put_open_state(state);
 922 out_err:
 923         up_read(&nfsi->rwsem);
 924         up_read(&clp->cl_sem);
 925         if (err != -EACCES)
 926                 nfs_inode_return_delegation(inode);
 927 out_put_state_owner:
 928         nfs4_put_state_owner(sp);
 929         return err;
 930 }
 931
 932 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 933 {
 934         struct nfs4_exception exception = { };
 935         struct nfs4_state *res = ERR_PTR(-EIO);
 936         int err;
 937
 938         do {
 939                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 940                 if (err == 0)
 941                         break;
 942                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 943                                         err, &exception));
 944         } while (exception.retry);
 945         return res;
 946 }
 947
 948 /*
 949  * Returns a referenced nfs4_state
 950  */
 951 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 952 {
 953         struct nfs4_state_owner  *sp;
 954         struct nfs4_state     *state = NULL;
 955         struct nfs_server       *server = NFS_SERVER(dir);
 956         struct nfs_client *clp = server->nfs_client;
 957         struct nfs4_opendata *opendata;
 958         int                     status;
 959
 960         /* Protect against reboot recovery conflicts */
 961         status = -ENOMEM;
 962         if (!(sp = nfs4_get_state_owner(server, cred))) {
 963                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 964                 goto out_err;
 965         }
 966         status = nfs4_recover_expired_lease(server);
 967         if (status != 0)
 968                 goto err_put_state_owner;
 969         down_read(&clp->cl_sem);
 970         status = -ENOMEM;
 971         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 972         if (opendata == NULL)
 973                 goto err_release_rwsem;
 974
 975         status = _nfs4_proc_open(opendata);
 976         if (status != 0)
 977                 goto err_opendata_free;
 978
 979         status = -ENOMEM;
 980         state = nfs4_opendata_to_nfs4_state(opendata);
 981         if (state == NULL)
 982                 goto err_opendata_free;
 983         if (opendata->o_res.delegation_type != 0)
 984                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 985         nfs4_opendata_free(opendata);
 986         nfs4_put_state_owner(sp);
 987         up_read(&clp->cl_sem);
 988         *res = state;
 989         return 0;
 990 err_opendata_free:
 991         nfs4_opendata_free(opendata);
 992 err_release_rwsem:
 993         up_read(&clp->cl_sem);
 994 err_put_state_owner:
 995         nfs4_put_state_owner(sp);
 996 out_err:
 997         *res = NULL;
 998         return status;
 999 }
1000
1001
1002 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1003 {
1004         struct nfs4_exception exception = { };
1005         struct nfs4_state *res;
1006         int status;
1007
1008         do {
1009                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1010                 if (status == 0)
1011                         break;
1012                 /* NOTE: BAD_SEQID means the server and client disagree about the
1013                  * book-keeping w.r.t. state-changing operations
1014                  * (OPEN/CLOSE/LOCK/LOCKU...)
1015                  * It is actually a sign of a bug on the client or on the server.
1016                  *
1017                  * If we receive a BAD_SEQID error in the particular case of
1018                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1019                  * have unhashed the old state_owner for us, and that we can
1020                  * therefore safely retry using a new one. We should still warn
1021                  * the user though...
1022                  */
1023                 if (status == -NFS4ERR_BAD_SEQID) {
1024                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1025                         exception.retry = 1;
1026                         continue;
1027                 }
1028                 /*
1029                  * BAD_STATEID on OPEN means that the server cancelled our
1030                  * state before it received the OPEN_CONFIRM.
1031                  * Recover by retrying the request as per the discussion
1032                  * on Page 181 of RFC3530.
1033                  */
1034                 if (status == -NFS4ERR_BAD_STATEID) {
1035                         exception.retry = 1;
1036                         continue;
1037                 }
1038                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1039                                         status, &exception));
1040         } while (exception.retry);
1041         return res;
1042 }
1043
1044 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1045                 struct iattr *sattr, struct nfs4_state *state)
1046 {
1047         struct nfs_server *server = NFS_SERVER(inode);
1048         struct nfs_setattrargs  arg = {
1049                 .fh             = NFS_FH(inode),
1050                 .iap            = sattr,
1051                 .server         = server,
1052                 .bitmask = server->attr_bitmask,
1053         };
1054         struct nfs_setattrres  res = {
1055                 .fattr          = fattr,
1056                 .server         = server,
1057         };
1058         struct rpc_message msg = {
1059                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1060                 .rpc_argp       = &arg,
1061                 .rpc_resp       = &res,
1062         };
1063         unsigned long timestamp = jiffies;
1064         int status;
1065
1066         nfs_fattr_init(fattr);
1067
1068         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1069                 /* Use that stateid */
1070         } else if (state != NULL) {
1071                 msg.rpc_cred = state->owner->so_cred;
1072                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1073         } else
1074                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1075
1076         status = rpc_call_sync(server->client, &msg, 0);
1077         if (status == 0 && state != NULL)
1078                 renew_lease(server, timestamp);
1079         return status;
1080 }
1081
1082 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1083                 struct iattr *sattr, struct nfs4_state *state)
1084 {
1085         struct nfs_server *server = NFS_SERVER(inode);
1086         struct nfs4_exception exception = { };
1087         int err;
1088         do {
1089                 err = nfs4_handle_exception(server,
1090                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1091                                 &exception);
1092         } while (exception.retry);
1093         return err;
1094 }
1095
1096 struct nfs4_closedata {
1097         struct inode *inode;
1098         struct nfs4_state *state;
1099         struct nfs_closeargs arg;
1100         struct nfs_closeres res;
1101         struct nfs_fattr fattr;
1102         unsigned long timestamp;
1103 };
1104
1105 static void nfs4_free_closedata(void *data)
1106 {
1107         struct nfs4_closedata *calldata = data;
1108         struct nfs4_state_owner *sp = calldata->state->owner;
1109
1110         nfs4_put_open_state(calldata->state);
1111         nfs_free_seqid(calldata->arg.seqid);
1112         nfs4_put_state_owner(sp);
1113         kfree(calldata);
1114 }
1115
1116 static void nfs4_close_done(struct rpc_task *task, void *data)
1117 {
1118         struct nfs4_closedata *calldata = data;
1119         struct nfs4_state *state = calldata->state;
1120         struct nfs_server *server = NFS_SERVER(calldata->inode);
1121
1122         if (RPC_ASSASSINATED(task))
1123                 return;
1124         /* hmm. we are done with the inode, and in the process of freeing
1125          * the state_owner. we keep this around to process errors
1126          */
1127         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1128         switch (task->tk_status) {
1129                 case 0:
1130                         memcpy(&state->stateid, &calldata->res.stateid,
1131                                         sizeof(state->stateid));
1132                         renew_lease(server, calldata->timestamp);
1133                         break;
1134                 case -NFS4ERR_STALE_STATEID:
1135                 case -NFS4ERR_EXPIRED:
1136                         nfs4_schedule_state_recovery(server->nfs_client);
1137                         break;
1138                 default:
1139                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1140                                 rpc_restart_call(task);
1141                                 return;
1142                         }
1143         }
1144         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1145 }
1146
1147 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1148 {
1149         struct nfs4_closedata *calldata = data;
1150         struct nfs4_state *state = calldata->state;
1151         struct rpc_message msg = {
1152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1153                 .rpc_argp = &calldata->arg,
1154                 .rpc_resp = &calldata->res,
1155                 .rpc_cred = state->owner->so_cred,
1156         };
1157         int mode = 0, old_mode;
1158
1159         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1160                 return;
1161         /* Recalculate the new open mode in case someone reopened the file
1162          * while we were waiting in line to be scheduled.
1163          */
1164         spin_lock(&state->owner->so_lock);
1165         spin_lock(&calldata->inode->i_lock);
1166         mode = old_mode = state->state;
1167         if (state->n_rdwr == 0) {
1168                 if (state->n_rdonly == 0)
1169                         mode &= ~FMODE_READ;
1170                 if (state->n_wronly == 0)
1171                         mode &= ~FMODE_WRITE;
1172         }
1173         nfs4_state_set_mode_locked(state, mode);
1174         spin_unlock(&calldata->inode->i_lock);
1175         spin_unlock(&state->owner->so_lock);
1176         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1177                 /* Note: exit _without_ calling nfs4_close_done */
1178                 task->tk_action = NULL;
1179                 return;
1180         }
1181         nfs_fattr_init(calldata->res.fattr);
1182         if (mode != 0)
1183                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1184         calldata->arg.open_flags = mode;
1185         calldata->timestamp = jiffies;
1186         rpc_call_setup(task, &msg, 0);
1187 }
1188
1189 static const struct rpc_call_ops nfs4_close_ops = {
1190         .rpc_call_prepare = nfs4_close_prepare,
1191         .rpc_call_done = nfs4_close_done,
1192         .rpc_release = nfs4_free_closedata,
1193 };
1194
1195 /*
1196  * It is possible for data to be read/written from a mem-mapped file
1197  * after the sys_close call (which hits the vfs layer as a flush).
1198  * This means that we can't safely call nfsv4 close on a file until
1199  * the inode is cleared. This in turn means that we are not good
1200  * NFSv4 citizens - we do not indicate to the server to update the file's
1201  * share state even when we are done with one of the three share
1202  * stateid's in the inode.
1203  *
1204  * NOTE: Caller must be holding the sp->so_owner semaphore!
1205  */
1206 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1207 {
1208         struct nfs_server *server = NFS_SERVER(inode);
1209         struct nfs4_closedata *calldata;
1210         int status = -ENOMEM;
1211
1212         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1213         if (calldata == NULL)
1214                 goto out;
1215         calldata->inode = inode;
1216         calldata->state = state;
1217         calldata->arg.fh = NFS_FH(inode);
1218         calldata->arg.stateid = &state->stateid;
1219         /* Serialization for the sequence id */
1220         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1221         if (calldata->arg.seqid == NULL)
1222                 goto out_free_calldata;
1223         calldata->arg.bitmask = server->attr_bitmask;
1224         calldata->res.fattr = &calldata->fattr;
1225         calldata->res.server = server;
1226
1227         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1228         if (status == 0)
1229                 goto out;
1230
1231         nfs_free_seqid(calldata->arg.seqid);
1232 out_free_calldata:
1233         kfree(calldata);
1234 out:
1235         return status;
1236 }
1237
1238 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1239 {
1240         struct file *filp;
1241
1242         filp = lookup_instantiate_filp(nd, dentry, NULL);
1243         if (!IS_ERR(filp)) {
1244                 struct nfs_open_context *ctx;
1245                 ctx = (struct nfs_open_context *)filp->private_data;
1246                 ctx->state = state;
1247                 return 0;
1248         }
1249         nfs4_close_state(state, nd->intent.open.flags);
1250         return PTR_ERR(filp);
1251 }
1252
1253 struct dentry *
1254 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1255 {
1256         struct iattr attr;
1257         struct rpc_cred *cred;
1258         struct nfs4_state *state;
1259         struct dentry *res;
1260
1261         if (nd->flags & LOOKUP_CREATE) {
1262                 attr.ia_mode = nd->intent.open.create_mode;
1263                 attr.ia_valid = ATTR_MODE;
1264                 if (!IS_POSIXACL(dir))
1265                         attr.ia_mode &= ~current->fs->umask;
1266         } else {
1267                 attr.ia_valid = 0;
1268                 BUG_ON(nd->intent.open.flags & O_CREAT);
1269         }
1270
1271         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1272         if (IS_ERR(cred))
1273                 return (struct dentry *)cred;
1274         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1275         put_rpccred(cred);
1276         if (IS_ERR(state)) {
1277                 if (PTR_ERR(state) == -ENOENT)
1278                         d_add(dentry, NULL);
1279                 return (struct dentry *)state;
1280         }
1281         res = d_add_unique(dentry, igrab(state->inode));
1282         if (res != NULL)
1283                 dentry = res;
1284         nfs4_intent_set_file(nd, dentry, state);
1285         return res;
1286 }
1287
1288 int
1289 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1290 {
1291         struct rpc_cred *cred;
1292         struct nfs4_state *state;
1293
1294         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1295         if (IS_ERR(cred))
1296                 return PTR_ERR(cred);
1297         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1298         if (IS_ERR(state))
1299                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1300         put_rpccred(cred);
1301         if (IS_ERR(state)) {
1302                 switch (PTR_ERR(state)) {
1303                         case -EPERM:
1304                         case -EACCES:
1305                         case -EDQUOT:
1306                         case -ENOSPC:
1307                         case -EROFS:
1308                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1309                                 return 1;
1310                         case -ENOENT:
1311                                 if (dentry->d_inode == NULL)
1312                                         return 1;
1313                 }
1314                 goto out_drop;
1315         }
1316         if (state->inode == dentry->d_inode) {
1317                 nfs4_intent_set_file(nd, dentry, state);
1318                 return 1;
1319         }
1320         nfs4_close_state(state, openflags);
1321 out_drop:
1322         d_drop(dentry);
1323         return 0;
1324 }
1325
1326
1327 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1328 {
1329         struct nfs4_server_caps_res res = {};
1330         struct rpc_message msg = {
1331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1332                 .rpc_argp = fhandle,
1333                 .rpc_resp = &res,
1334         };
1335         int status;
1336
1337         status = rpc_call_sync(server->client, &msg, 0);
1338         if (status == 0) {
1339                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1340                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1341                         server->caps |= NFS_CAP_ACLS;
1342                 if (res.has_links != 0)
1343                         server->caps |= NFS_CAP_HARDLINKS;
1344                 if (res.has_symlinks != 0)
1345                         server->caps |= NFS_CAP_SYMLINKS;
1346                 server->acl_bitmask = res.acl_bitmask;
1347         }
1348         return status;
1349 }
1350
1351 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1352 {
1353         struct nfs4_exception exception = { };
1354         int err;
1355         do {
1356                 err = nfs4_handle_exception(server,
1357                                 _nfs4_server_capabilities(server, fhandle),
1358                                 &exception);
1359         } while (exception.retry);
1360         return err;
1361 }
1362
1363 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1364                 struct nfs_fsinfo *info)
1365 {
1366         struct nfs4_lookup_root_arg args = {
1367                 .bitmask = nfs4_fattr_bitmap,
1368         };
1369         struct nfs4_lookup_res res = {
1370                 .server = server,
1371                 .fattr = info->fattr,
1372                 .fh = fhandle,
1373         };
1374         struct rpc_message msg = {
1375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1376                 .rpc_argp = &args,
1377                 .rpc_resp = &res,
1378         };
1379         nfs_fattr_init(info->fattr);
1380         return rpc_call_sync(server->client, &msg, 0);
1381 }
1382
1383 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1384                 struct nfs_fsinfo *info)
1385 {
1386         struct nfs4_exception exception = { };
1387         int err;
1388         do {
1389                 err = nfs4_handle_exception(server,
1390                                 _nfs4_lookup_root(server, fhandle, info),
1391                                 &exception);
1392         } while (exception.retry);
1393         return err;
1394 }
1395
1396 /*
1397  * get the file handle for the "/" directory on the server
1398  */
1399 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1400                               struct nfs_fsinfo *info)
1401 {
1402         int status;
1403
1404         status = nfs4_lookup_root(server, fhandle, info);
1405         if (status == 0)
1406                 status = nfs4_server_capabilities(server, fhandle);
1407         if (status == 0)
1408                 status = nfs4_do_fsinfo(server, fhandle, info);
1409         return nfs4_map_errors(status);
1410 }
1411
1412 /*
1413  * Get locations and (maybe) other attributes of a referral.
1414  * Note that we'll actually follow the referral later when
1415  * we detect fsid mismatch in inode revalidation
1416  */
1417 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1418 {
1419         int status = -ENOMEM;
1420         struct page *page = NULL;
1421         struct nfs4_fs_locations *locations = NULL;
1422         struct dentry dentry = {};
1423
1424         page = alloc_page(GFP_KERNEL);
1425         if (page == NULL)
1426                 goto out;
1427         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1428         if (locations == NULL)
1429                 goto out;
1430
1431         dentry.d_name.name = name->name;
1432         dentry.d_name.len = name->len;
1433         status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1434         if (status != 0)
1435                 goto out;
1436         /* Make sure server returned a different fsid for the referral */
1437         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1438                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1439                 status = -EIO;
1440                 goto out;
1441         }
1442
1443         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1444         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1445         if (!fattr->mode)
1446                 fattr->mode = S_IFDIR;
1447         memset(fhandle, 0, sizeof(struct nfs_fh));
1448 out:
1449         if (page)
1450                 __free_page(page);
1451         if (locations)
1452                 kfree(locations);
1453         return status;
1454 }
1455
1456 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1457 {
1458         struct nfs4_getattr_arg args = {
1459                 .fh = fhandle,
1460                 .bitmask = server->attr_bitmask,
1461         };
1462         struct nfs4_getattr_res res = {
1463                 .fattr = fattr,
1464                 .server = server,
1465         };
1466         struct rpc_message msg = {
1467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1468                 .rpc_argp = &args,
1469                 .rpc_resp = &res,
1470         };
1471
1472         nfs_fattr_init(fattr);
1473         return rpc_call_sync(server->client, &msg, 0);
1474 }
1475
1476 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1477 {
1478         struct nfs4_exception exception = { };
1479         int err;
1480         do {
1481                 err = nfs4_handle_exception(server,
1482                                 _nfs4_proc_getattr(server, fhandle, fattr),
1483                                 &exception);
1484         } while (exception.retry);
1485         return err;
1486 }
1487
1488 /*
1489  * The file is not closed if it is opened due to the a request to change
1490  * the size of the file. The open call will not be needed once the
1491  * VFS layer lookup-intents are implemented.
1492  *
1493  * Close is called when the inode is destroyed.
1494  * If we haven't opened the file for O_WRONLY, we
1495  * need to in the size_change case to obtain a stateid.
1496  *
1497  * Got race?
1498  * Because OPEN is always done by name in nfsv4, it is
1499  * possible that we opened a different file by the same
1500  * name.  We can recognize this race condition, but we
1501  * can't do anything about it besides returning an error.
1502  *
1503  * This will be fixed with VFS changes (lookup-intent).
1504  */
1505 static int
1506 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1507                   struct iattr *sattr)
1508 {
1509         struct rpc_cred *cred;
1510         struct inode *inode = dentry->d_inode;
1511         struct nfs_open_context *ctx;
1512         struct nfs4_state *state = NULL;
1513         int status;
1514
1515         nfs_fattr_init(fattr);
1516
1517         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1518         if (IS_ERR(cred))
1519                 return PTR_ERR(cred);
1520
1521         /* Search for an existing open(O_WRITE) file */
1522         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1523         if (ctx != NULL)
1524                 state = ctx->state;
1525
1526         status = nfs4_do_setattr(inode, fattr, sattr, state);
1527         if (status == 0)
1528                 nfs_setattr_update_inode(inode, sattr);
1529         if (ctx != NULL)
1530                 put_nfs_open_context(ctx);
1531         put_rpccred(cred);
1532         return status;
1533 }
1534
1535 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1536                 struct qstr *name, struct nfs_fh *fhandle,
1537                 struct nfs_fattr *fattr)
1538 {
1539         int                    status;
1540         struct nfs4_lookup_arg args = {
1541                 .bitmask = server->attr_bitmask,
1542                 .dir_fh = dirfh,
1543                 .name = name,
1544         };
1545         struct nfs4_lookup_res res = {
1546                 .server = server,
1547                 .fattr = fattr,
1548                 .fh = fhandle,
1549         };
1550         struct rpc_message msg = {
1551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1552                 .rpc_argp = &args,
1553                 .rpc_resp = &res,
1554         };
1555
1556         nfs_fattr_init(fattr);
1557
1558         dprintk("NFS call  lookupfh %s\n", name->name);
1559         status = rpc_call_sync(server->client, &msg, 0);
1560         dprintk("NFS reply lookupfh: %d\n", status);
1561         if (status == -NFS4ERR_MOVED)
1562                 status = -EREMOTE;
1563         return status;
1564 }
1565
1566 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1567                               struct qstr *name, struct nfs_fh *fhandle,
1568                               struct nfs_fattr *fattr)
1569 {
1570         struct nfs4_exception exception = { };
1571         int err;
1572         do {
1573                 err = nfs4_handle_exception(server,
1574                                 _nfs4_proc_lookupfh(server, dirfh, name,
1575                                                     fhandle, fattr),
1576                                 &exception);
1577         } while (exception.retry);
1578         return err;
1579 }
1580
1581 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1582                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1583 {
1584         int                    status;
1585         struct nfs_server *server = NFS_SERVER(dir);
1586         struct nfs4_lookup_arg args = {
1587                 .bitmask = server->attr_bitmask,
1588                 .dir_fh = NFS_FH(dir),
1589                 .name = name,
1590         };
1591         struct nfs4_lookup_res res = {
1592                 .server = server,
1593                 .fattr = fattr,
1594                 .fh = fhandle,
1595         };
1596         struct rpc_message msg = {
1597                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1598                 .rpc_argp = &args,
1599                 .rpc_resp = &res,
1600         };
1601
1602         nfs_fattr_init(fattr);
1603
1604         dprintk("NFS call  lookup %s\n", name->name);
1605         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1606         if (status == -NFS4ERR_MOVED)
1607                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1608         dprintk("NFS reply lookup: %d\n", status);
1609         return status;
1610 }
1611
1612 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1613 {
1614         struct nfs4_exception exception = { };
1615         int err;
1616         do {
1617                 err = nfs4_handle_exception(NFS_SERVER(dir),
1618                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1619                                 &exception);
1620         } while (exception.retry);
1621         return err;
1622 }
1623
1624 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1625 {
1626         struct nfs4_accessargs args = {
1627                 .fh = NFS_FH(inode),
1628         };
1629         struct nfs4_accessres res = { 0 };
1630         struct rpc_message msg = {
1631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1632                 .rpc_argp = &args,
1633                 .rpc_resp = &res,
1634                 .rpc_cred = entry->cred,
1635         };
1636         int mode = entry->mask;
1637         int status;
1638
1639         /*
1640          * Determine which access bits we want to ask for...
1641          */
1642         if (mode & MAY_READ)
1643                 args.access |= NFS4_ACCESS_READ;
1644         if (S_ISDIR(inode->i_mode)) {
1645                 if (mode & MAY_WRITE)
1646                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1647                 if (mode & MAY_EXEC)
1648                         args.access |= NFS4_ACCESS_LOOKUP;
1649         } else {
1650                 if (mode & MAY_WRITE)
1651                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1652                 if (mode & MAY_EXEC)
1653                         args.access |= NFS4_ACCESS_EXECUTE;
1654         }
1655         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1656         if (!status) {
1657                 entry->mask = 0;
1658                 if (res.access & NFS4_ACCESS_READ)
1659                         entry->mask |= MAY_READ;
1660                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1661                         entry->mask |= MAY_WRITE;
1662                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1663                         entry->mask |= MAY_EXEC;
1664         }
1665         return status;
1666 }
1667
1668 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1669 {
1670         struct nfs4_exception exception = { };
1671         int err;
1672         do {
1673                 err = nfs4_handle_exception(NFS_SERVER(inode),
1674                                 _nfs4_proc_access(inode, entry),
1675                                 &exception);
1676         } while (exception.retry);
1677         return err;
1678 }
1679
1680 /*
1681  * TODO: For the time being, we don't try to get any attributes
1682  * along with any of the zero-copy operations READ, READDIR,
1683  * READLINK, WRITE.
1684  *
1685  * In the case of the first three, we want to put the GETATTR
1686  * after the read-type operation -- this is because it is hard
1687  * to predict the length of a GETATTR response in v4, and thus
1688  * align the READ data correctly.  This means that the GETATTR
1689  * may end up partially falling into the page cache, and we should
1690  * shift it into the 'tail' of the xdr_buf before processing.
1691  * To do this efficiently, we need to know the total length
1692  * of data received, which doesn't seem to be available outside
1693  * of the RPC layer.
1694  *
1695  * In the case of WRITE, we also want to put the GETATTR after
1696  * the operation -- in this case because we want to make sure
1697  * we get the post-operation mtime and size.  This means that
1698  * we can't use xdr_encode_pages() as written: we need a variant
1699  * of it which would leave room in the 'tail' iovec.
1700  *
1701  * Both of these changes to the XDR layer would in fact be quite
1702  * minor, but I decided to leave them for a subsequent patch.
1703  */
1704 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1705                 unsigned int pgbase, unsigned int pglen)
1706 {
1707         struct nfs4_readlink args = {
1708                 .fh       = NFS_FH(inode),
1709                 .pgbase   = pgbase,
1710                 .pglen    = pglen,
1711                 .pages    = &page,
1712         };
1713         struct rpc_message msg = {
1714                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1715                 .rpc_argp = &args,
1716                 .rpc_resp = NULL,
1717         };
1718
1719         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1720 }
1721
1722 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1723                 unsigned int pgbase, unsigned int pglen)
1724 {
1725         struct nfs4_exception exception = { };
1726         int err;
1727         do {
1728                 err = nfs4_handle_exception(NFS_SERVER(inode),
1729                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1730                                 &exception);
1731         } while (exception.retry);
1732         return err;
1733 }
1734
1735 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1736 {
1737         int flags = rdata->flags;
1738         struct inode *inode = rdata->inode;
1739         struct nfs_fattr *fattr = rdata->res.fattr;
1740         struct nfs_server *server = NFS_SERVER(inode);
1741         struct rpc_message msg = {
1742                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1743                 .rpc_argp       = &rdata->args,
1744                 .rpc_resp       = &rdata->res,
1745                 .rpc_cred       = rdata->cred,
1746         };
1747         unsigned long timestamp = jiffies;
1748         int status;
1749
1750         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1751                         (long long) rdata->args.offset);
1752
1753         nfs_fattr_init(fattr);
1754         status = rpc_call_sync(server->client, &msg, flags);
1755         if (!status)
1756                 renew_lease(server, timestamp);
1757         dprintk("NFS reply read: %d\n", status);
1758         return status;
1759 }
1760
1761 static int nfs4_proc_read(struct nfs_read_data *rdata)
1762 {
1763         struct nfs4_exception exception = { };
1764         int err;
1765         do {
1766                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1767                                 _nfs4_proc_read(rdata),
1768                                 &exception);
1769         } while (exception.retry);
1770         return err;
1771 }
1772
1773 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1774 {
1775         int rpcflags = wdata->flags;
1776         struct inode *inode = wdata->inode;
1777         struct nfs_fattr *fattr = wdata->res.fattr;
1778         struct nfs_server *server = NFS_SERVER(inode);
1779         struct rpc_message msg = {
1780                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1781                 .rpc_argp       = &wdata->args,
1782                 .rpc_resp       = &wdata->res,
1783                 .rpc_cred       = wdata->cred,
1784         };
1785         int status;
1786
1787         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1788                         (long long) wdata->args.offset);
1789
1790         wdata->args.bitmask = server->attr_bitmask;
1791         wdata->res.server = server;
1792         wdata->timestamp = jiffies;
1793         nfs_fattr_init(fattr);
1794         status = rpc_call_sync(server->client, &msg, rpcflags);
1795         dprintk("NFS reply write: %d\n", status);
1796         if (status < 0)
1797                 return status;
1798         renew_lease(server, wdata->timestamp);
1799         nfs_post_op_update_inode(inode, fattr);
1800         return wdata->res.count;
1801 }
1802
1803 static int nfs4_proc_write(struct nfs_write_data *wdata)
1804 {
1805         struct nfs4_exception exception = { };
1806         int err;
1807         do {
1808                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1809                                 _nfs4_proc_write(wdata),
1810                                 &exception);
1811         } while (exception.retry);
1812         return err;
1813 }
1814
1815 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1816 {
1817         struct inode *inode = cdata->inode;
1818         struct nfs_fattr *fattr = cdata->res.fattr;
1819         struct nfs_server *server = NFS_SERVER(inode);
1820         struct rpc_message msg = {
1821                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1822                 .rpc_argp       = &cdata->args,
1823                 .rpc_resp       = &cdata->res,
1824                 .rpc_cred       = cdata->cred,
1825         };
1826         int status;
1827
1828         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1829                         (long long) cdata->args.offset);
1830
1831         cdata->args.bitmask = server->attr_bitmask;
1832         cdata->res.server = server;
1833         cdata->timestamp = jiffies;
1834         nfs_fattr_init(fattr);
1835         status = rpc_call_sync(server->client, &msg, 0);
1836         if (status >= 0)
1837                 renew_lease(server, cdata->timestamp);
1838         dprintk("NFS reply commit: %d\n", status);
1839         if (status >= 0)
1840                 nfs_post_op_update_inode(inode, fattr);
1841         return status;
1842 }
1843
1844 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1845 {
1846         struct nfs4_exception exception = { };
1847         int err;
1848         do {
1849                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1850                                 _nfs4_proc_commit(cdata),
1851                                 &exception);
1852         } while (exception.retry);
1853         return err;
1854 }
1855
1856 /*
1857  * Got race?
1858  * We will need to arrange for the VFS layer to provide an atomic open.
1859  * Until then, this create/open method is prone to inefficiency and race
1860  * conditions due to the lookup, create, and open VFS calls from sys_open()
1861  * placed on the wire.
1862  *
1863  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1864  * The file will be opened again in the subsequent VFS open call
1865  * (nfs4_proc_file_open).
1866  *
1867  * The open for read will just hang around to be used by any process that
1868  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1869  */
1870
1871 static int
1872 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1873                  int flags, struct nameidata *nd)
1874 {
1875         struct nfs4_state *state;
1876         struct rpc_cred *cred;
1877         int status = 0;
1878
1879         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1880         if (IS_ERR(cred)) {
1881                 status = PTR_ERR(cred);
1882                 goto out;
1883         }
1884         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1885         put_rpccred(cred);
1886         if (IS_ERR(state)) {
1887                 status = PTR_ERR(state);
1888                 goto out;
1889         }
1890         d_instantiate(dentry, igrab(state->inode));
1891         if (flags & O_EXCL) {
1892                 struct nfs_fattr fattr;
1893                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1894                 if (status == 0)
1895                         nfs_setattr_update_inode(state->inode, sattr);
1896         }
1897         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1898                 status = nfs4_intent_set_file(nd, dentry, state);
1899         else
1900                 nfs4_close_state(state, flags);
1901 out:
1902         return status;
1903 }
1904
1905 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1906 {
1907         struct nfs_server *server = NFS_SERVER(dir);
1908         struct nfs4_remove_arg args = {
1909                 .fh = NFS_FH(dir),
1910                 .name = name,
1911                 .bitmask = server->attr_bitmask,
1912         };
1913         struct nfs_fattr dir_attr;
1914         struct nfs4_remove_res  res = {
1915                 .server = server,
1916                 .dir_attr = &dir_attr,
1917         };
1918         struct rpc_message msg = {
1919                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1920                 .rpc_argp       = &args,
1921                 .rpc_resp       = &res,
1922         };
1923         int                     status;
1924
1925         nfs_fattr_init(res.dir_attr);
1926         status = rpc_call_sync(server->client, &msg, 0);
1927         if (status == 0) {
1928                 update_changeattr(dir, &res.cinfo);
1929                 nfs_post_op_update_inode(dir, res.dir_attr);
1930         }
1931         return status;
1932 }
1933
1934 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1935 {
1936         struct nfs4_exception exception = { };
1937         int err;
1938         do {
1939                 err = nfs4_handle_exception(NFS_SERVER(dir),
1940                                 _nfs4_proc_remove(dir, name),
1941                                 &exception);
1942         } while (exception.retry);
1943         return err;
1944 }
1945
1946 struct unlink_desc {
1947         struct nfs4_remove_arg  args;
1948         struct nfs4_remove_res  res;
1949         struct nfs_fattr dir_attr;
1950 };
1951
1952 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1953                 struct qstr *name)
1954 {
1955         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1956         struct unlink_desc *up;
1957
1958         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1959         if (!up)
1960                 return -ENOMEM;
1961
1962         up->args.fh = NFS_FH(dir->d_inode);
1963         up->args.name = name;
1964         up->args.bitmask = server->attr_bitmask;
1965         up->res.server = server;
1966         up->res.dir_attr = &up->dir_attr;
1967
1968         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1969         msg->rpc_argp = &up->args;
1970         msg->rpc_resp = &up->res;
1971         return 0;
1972 }
1973
1974 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1975 {
1976         struct rpc_message *msg = &task->tk_msg;
1977         struct unlink_desc *up;
1978
1979         if (msg->rpc_resp != NULL) {
1980                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1981                 update_changeattr(dir->d_inode, &up->res.cinfo);
1982                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1983                 kfree(up);
1984                 msg->rpc_resp = NULL;
1985                 msg->rpc_argp = NULL;
1986         }
1987         return 0;
1988 }
1989
1990 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1991                 struct inode *new_dir, struct qstr *new_name)
1992 {
1993         struct nfs_server *server = NFS_SERVER(old_dir);
1994         struct nfs4_rename_arg arg = {
1995                 .old_dir = NFS_FH(old_dir),
1996                 .new_dir = NFS_FH(new_dir),
1997                 .old_name = old_name,
1998                 .new_name = new_name,
1999                 .bitmask = server->attr_bitmask,
2000         };
2001         struct nfs_fattr old_fattr, new_fattr;
2002         struct nfs4_rename_res res = {
2003                 .server = server,
2004                 .old_fattr = &old_fattr,
2005                 .new_fattr = &new_fattr,
2006         };
2007         struct rpc_message msg = {
2008                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2009                 .rpc_argp = &arg,
2010                 .rpc_resp = &res,
2011         };
2012         int                     status;
2013
2014         nfs_fattr_init(res.old_fattr);
2015         nfs_fattr_init(res.new_fattr);
2016         status = rpc_call_sync(server->client, &msg, 0);
2017
2018         if (!status) {
2019                 update_changeattr(old_dir, &res.old_cinfo);
2020                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2021                 update_changeattr(new_dir, &res.new_cinfo);
2022                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2023         }
2024         return status;
2025 }
2026
2027 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2028                 struct inode *new_dir, struct qstr *new_name)
2029 {
2030         struct nfs4_exception exception = { };
2031         int err;
2032         do {
2033                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2034                                 _nfs4_proc_rename(old_dir, old_name,
2035                                         new_dir, new_name),
2036                                 &exception);
2037         } while (exception.retry);
2038         return err;
2039 }
2040
2041 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2042 {
2043         struct nfs_server *server = NFS_SERVER(inode);
2044         struct nfs4_link_arg arg = {
2045                 .fh     = NFS_FH(inode),
2046                 .dir_fh = NFS_FH(dir),
2047                 .name   = name,
2048                 .bitmask = server->attr_bitmask,
2049         };
2050         struct nfs_fattr fattr, dir_attr;
2051         struct nfs4_link_res res = {
2052                 .server = server,
2053                 .fattr = &fattr,
2054                 .dir_attr = &dir_attr,
2055         };
2056         struct rpc_message msg = {
2057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2058                 .rpc_argp = &arg,
2059                 .rpc_resp = &res,
2060         };
2061         int                     status;
2062
2063         nfs_fattr_init(res.fattr);
2064         nfs_fattr_init(res.dir_attr);
2065         status = rpc_call_sync(server->client, &msg, 0);
2066         if (!status) {
2067                 update_changeattr(dir, &res.cinfo);
2068                 nfs_post_op_update_inode(dir, res.dir_attr);
2069                 nfs_post_op_update_inode(inode, res.fattr);
2070         }
2071
2072         return status;
2073 }
2074
2075 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2076 {
2077         struct nfs4_exception exception = { };
2078         int err;
2079         do {
2080                 err = nfs4_handle_exception(NFS_SERVER(inode),
2081                                 _nfs4_proc_link(inode, dir, name),
2082                                 &exception);
2083         } while (exception.retry);
2084         return err;
2085 }
2086
2087 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2088                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2089                 struct nfs_fattr *fattr)
2090 {
2091         struct nfs_server *server = NFS_SERVER(dir);
2092         struct nfs_fattr dir_fattr;
2093         struct nfs4_create_arg arg = {
2094                 .dir_fh = NFS_FH(dir),
2095                 .server = server,
2096                 .name = name,
2097                 .attrs = sattr,
2098                 .ftype = NF4LNK,
2099                 .bitmask = server->attr_bitmask,
2100         };
2101         struct nfs4_create_res res = {
2102                 .server = server,
2103                 .fh = fhandle,
2104                 .fattr = fattr,
2105                 .dir_fattr = &dir_fattr,
2106         };
2107         struct rpc_message msg = {
2108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2109                 .rpc_argp = &arg,
2110                 .rpc_resp = &res,
2111         };
2112         int                     status;
2113
2114         if (path->len > NFS4_MAXPATHLEN)
2115                 return -ENAMETOOLONG;
2116         arg.u.symlink = path;
2117         nfs_fattr_init(fattr);
2118         nfs_fattr_init(&dir_fattr);
2119
2120         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2121         if (!status)
2122                 update_changeattr(dir, &res.dir_cinfo);
2123         nfs_post_op_update_inode(dir, res.dir_fattr);
2124         return status;
2125 }
2126
2127 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2128                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2129                 struct nfs_fattr *fattr)
2130 {
2131         struct nfs4_exception exception = { };
2132         int err;
2133         do {
2134                 err = nfs4_handle_exception(NFS_SERVER(dir),
2135                                 _nfs4_proc_symlink(dir, name, path, sattr,
2136                                         fhandle, fattr),
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         lock_kernel();
2219         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2220         res.pgbase = args.pgbase;
2221         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2222         if (status == 0)
2223                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2224         unlock_kernel();
2225         dprintk("%s: returns %d\n", __FUNCTION__, status);
2226         return status;
2227 }
2228
2229 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2230                   u64 cookie, struct page *page, unsigned int count, int plus)
2231 {
2232         struct nfs4_exception exception = { };
2233         int err;
2234         do {
2235                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2236                                 _nfs4_proc_readdir(dentry, cred, cookie,
2237                                         page, count, plus),
2238                                 &exception);
2239         } while (exception.retry);
2240         return err;
2241 }
2242
2243 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2244                 struct iattr *sattr, dev_t rdev)
2245 {
2246         struct nfs_server *server = NFS_SERVER(dir);
2247         struct nfs_fh fh;
2248         struct nfs_fattr fattr, dir_fattr;
2249         struct nfs4_create_arg arg = {
2250                 .dir_fh = NFS_FH(dir),
2251                 .server = server,
2252                 .name = &dentry->d_name,
2253                 .attrs = sattr,
2254                 .bitmask = server->attr_bitmask,
2255         };
2256         struct nfs4_create_res res = {
2257                 .server = server,
2258                 .fh = &fh,
2259                 .fattr = &fattr,
2260                 .dir_fattr = &dir_fattr,
2261         };
2262         struct rpc_message msg = {
2263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2264                 .rpc_argp = &arg,
2265                 .rpc_resp = &res,
2266         };
2267         int                     status;
2268         int                     mode = sattr->ia_mode;
2269
2270         nfs_fattr_init(&fattr);
2271         nfs_fattr_init(&dir_fattr);
2272
2273         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2274         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2275         if (S_ISFIFO(mode))
2276                 arg.ftype = NF4FIFO;
2277         else if (S_ISBLK(mode)) {
2278                 arg.ftype = NF4BLK;
2279                 arg.u.device.specdata1 = MAJOR(rdev);
2280                 arg.u.device.specdata2 = MINOR(rdev);
2281         }
2282         else if (S_ISCHR(mode)) {
2283                 arg.ftype = NF4CHR;
2284                 arg.u.device.specdata1 = MAJOR(rdev);
2285                 arg.u.device.specdata2 = MINOR(rdev);
2286         }
2287         else
2288                 arg.ftype = NF4SOCK;
2289
2290         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2291         if (status == 0) {
2292                 update_changeattr(dir, &res.dir_cinfo);
2293                 nfs_post_op_update_inode(dir, res.dir_fattr);
2294                 status = nfs_instantiate(dentry, &fh, &fattr);
2295         }
2296         return status;
2297 }
2298
2299 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2300                 struct iattr *sattr, dev_t rdev)
2301 {
2302         struct nfs4_exception exception = { };
2303         int err;
2304         do {
2305                 err = nfs4_handle_exception(NFS_SERVER(dir),
2306                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2307                                 &exception);
2308         } while (exception.retry);
2309         return err;
2310 }
2311
2312 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2313                  struct nfs_fsstat *fsstat)
2314 {
2315         struct nfs4_statfs_arg args = {
2316                 .fh = fhandle,
2317                 .bitmask = server->attr_bitmask,
2318         };
2319         struct rpc_message msg = {
2320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2321                 .rpc_argp = &args,
2322                 .rpc_resp = fsstat,
2323         };
2324
2325         nfs_fattr_init(fsstat->fattr);
2326         return rpc_call_sync(server->client, &msg, 0);
2327 }
2328
2329 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2330 {
2331         struct nfs4_exception exception = { };
2332         int err;
2333         do {
2334                 err = nfs4_handle_exception(server,
2335                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2336                                 &exception);
2337         } while (exception.retry);
2338         return err;
2339 }
2340
2341 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2342                 struct nfs_fsinfo *fsinfo)
2343 {
2344         struct nfs4_fsinfo_arg args = {
2345                 .fh = fhandle,
2346                 .bitmask = server->attr_bitmask,
2347         };
2348         struct rpc_message msg = {
2349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2350                 .rpc_argp = &args,
2351                 .rpc_resp = fsinfo,
2352         };
2353
2354         return rpc_call_sync(server->client, &msg, 0);
2355 }
2356
2357 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2358 {
2359         struct nfs4_exception exception = { };
2360         int err;
2361
2362         do {
2363                 err = nfs4_handle_exception(server,
2364                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2365                                 &exception);
2366         } while (exception.retry);
2367         return err;
2368 }
2369
2370 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2371 {
2372         nfs_fattr_init(fsinfo->fattr);
2373         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2374 }
2375
2376 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2377                 struct nfs_pathconf *pathconf)
2378 {
2379         struct nfs4_pathconf_arg args = {
2380                 .fh = fhandle,
2381                 .bitmask = server->attr_bitmask,
2382         };
2383         struct rpc_message msg = {
2384                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2385                 .rpc_argp = &args,
2386                 .rpc_resp = pathconf,
2387         };
2388
2389         /* None of the pathconf attributes are mandatory to implement */
2390         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2391                 memset(pathconf, 0, sizeof(*pathconf));
2392                 return 0;
2393         }
2394
2395         nfs_fattr_init(pathconf->fattr);
2396         return rpc_call_sync(server->client, &msg, 0);
2397 }
2398
2399 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2400                 struct nfs_pathconf *pathconf)
2401 {
2402         struct nfs4_exception exception = { };
2403         int err;
2404
2405         do {
2406                 err = nfs4_handle_exception(server,
2407                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2408                                 &exception);
2409         } while (exception.retry);
2410         return err;
2411 }
2412
2413 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2414 {
2415         struct nfs_server *server = NFS_SERVER(data->inode);
2416
2417         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2418                 rpc_restart_call(task);
2419                 return -EAGAIN;
2420         }
2421         if (task->tk_status > 0)
2422                 renew_lease(server, data->timestamp);
2423         return 0;
2424 }
2425
2426 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2427 {
2428         struct rpc_message msg = {
2429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2430                 .rpc_argp = &data->args,
2431                 .rpc_resp = &data->res,
2432                 .rpc_cred = data->cred,
2433         };
2434
2435         data->timestamp   = jiffies;
2436
2437         rpc_call_setup(&data->task, &msg, 0);
2438 }
2439
2440 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2441 {
2442         struct inode *inode = data->inode;
2443
2444         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2445                 rpc_restart_call(task);
2446                 return -EAGAIN;
2447         }
2448         if (task->tk_status >= 0) {
2449                 renew_lease(NFS_SERVER(inode), data->timestamp);
2450                 nfs_post_op_update_inode(inode, data->res.fattr);
2451         }
2452         return 0;
2453 }
2454
2455 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2456 {
2457         struct rpc_message msg = {
2458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2459                 .rpc_argp = &data->args,
2460                 .rpc_resp = &data->res,
2461                 .rpc_cred = data->cred,
2462         };
2463         struct inode *inode = data->inode;
2464         struct nfs_server *server = NFS_SERVER(inode);
2465         int stable;
2466
2467         if (how & FLUSH_STABLE) {
2468                 if (!NFS_I(inode)->ncommit)
2469                         stable = NFS_FILE_SYNC;
2470                 else
2471                         stable = NFS_DATA_SYNC;
2472         } else
2473                 stable = NFS_UNSTABLE;
2474         data->args.stable = stable;
2475         data->args.bitmask = server->attr_bitmask;
2476         data->res.server = server;
2477
2478         data->timestamp   = jiffies;
2479
2480         /* Finalize the task. */
2481         rpc_call_setup(&data->task, &msg, 0);
2482 }
2483
2484 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2485 {
2486         struct inode *inode = data->inode;
2487
2488         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2489                 rpc_restart_call(task);
2490                 return -EAGAIN;
2491         }
2492         if (task->tk_status >= 0)
2493                 nfs_post_op_update_inode(inode, data->res.fattr);
2494         return 0;
2495 }
2496
2497 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2498 {
2499         struct rpc_message msg = {
2500                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2501                 .rpc_argp = &data->args,
2502                 .rpc_resp = &data->res,
2503                 .rpc_cred = data->cred,
2504         };
2505         struct nfs_server *server = NFS_SERVER(data->inode);
2506
2507         data->args.bitmask = server->attr_bitmask;
2508         data->res.server = server;
2509
2510         rpc_call_setup(&data->task, &msg, 0);
2511 }
2512
2513 /*
2514  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2515  * standalone procedure for queueing an asynchronous RENEW.
2516  */
2517 static void nfs4_renew_done(struct rpc_task *task, void *data)
2518 {
2519         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2520         unsigned long timestamp = (unsigned long)data;
2521
2522         if (task->tk_status < 0) {
2523                 switch (task->tk_status) {
2524                         case -NFS4ERR_STALE_CLIENTID:
2525                         case -NFS4ERR_EXPIRED:
2526                         case -NFS4ERR_CB_PATH_DOWN:
2527                                 nfs4_schedule_state_recovery(clp);
2528                 }
2529                 return;
2530         }
2531         spin_lock(&clp->cl_lock);
2532         if (time_before(clp->cl_last_renewal,timestamp))
2533                 clp->cl_last_renewal = timestamp;
2534         spin_unlock(&clp->cl_lock);
2535 }
2536
2537 static const struct rpc_call_ops nfs4_renew_ops = {
2538         .rpc_call_done = nfs4_renew_done,
2539 };
2540
2541 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2542 {
2543         struct rpc_message msg = {
2544                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2545                 .rpc_argp       = clp,
2546                 .rpc_cred       = cred,
2547         };
2548
2549         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2550                         &nfs4_renew_ops, (void *)jiffies);
2551 }
2552
2553 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2554 {
2555         struct rpc_message msg = {
2556                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2557                 .rpc_argp       = clp,
2558                 .rpc_cred       = cred,
2559         };
2560         unsigned long now = jiffies;
2561         int status;
2562
2563         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2564         if (status < 0)
2565                 return status;
2566         spin_lock(&clp->cl_lock);
2567         if (time_before(clp->cl_last_renewal,now))
2568                 clp->cl_last_renewal = now;
2569         spin_unlock(&clp->cl_lock);
2570         return 0;
2571 }
2572
2573 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2574 {
2575         return (server->caps & NFS_CAP_ACLS)
2576                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2577                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2578 }
2579
2580 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2581  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2582  * the stack.
2583  */
2584 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2585
2586 static void buf_to_pages(const void *buf, size_t buflen,
2587                 struct page **pages, unsigned int *pgbase)
2588 {
2589         const void *p = buf;
2590
2591         *pgbase = offset_in_page(buf);
2592         p -= *pgbase;
2593         while (p < buf + buflen) {
2594                 *(pages++) = virt_to_page(p);
2595                 p += PAGE_CACHE_SIZE;
2596         }
2597 }
2598
2599 struct nfs4_cached_acl {
2600         int cached;
2601         size_t len;
2602         char data[0];
2603 };
2604
2605 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2606 {
2607         struct nfs_inode *nfsi = NFS_I(inode);
2608
2609         spin_lock(&inode->i_lock);
2610         kfree(nfsi->nfs4_acl);
2611         nfsi->nfs4_acl = acl;
2612         spin_unlock(&inode->i_lock);
2613 }
2614
2615 static void nfs4_zap_acl_attr(struct inode *inode)
2616 {
2617         nfs4_set_cached_acl(inode, NULL);
2618 }
2619
2620 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2621 {
2622         struct nfs_inode *nfsi = NFS_I(inode);
2623         struct nfs4_cached_acl *acl;
2624         int ret = -ENOENT;
2625
2626         spin_lock(&inode->i_lock);
2627         acl = nfsi->nfs4_acl;
2628         if (acl == NULL)
2629                 goto out;
2630         if (buf == NULL) /* user is just asking for length */
2631                 goto out_len;
2632         if (acl->cached == 0)
2633                 goto out;
2634         ret = -ERANGE; /* see getxattr(2) man page */
2635         if (acl->len > buflen)
2636                 goto out;
2637         memcpy(buf, acl->data, acl->len);
2638 out_len:
2639         ret = acl->len;
2640 out:
2641         spin_unlock(&inode->i_lock);
2642         return ret;
2643 }
2644
2645 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2646 {
2647         struct nfs4_cached_acl *acl;
2648
2649         if (buf && acl_len <= PAGE_SIZE) {
2650                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2651                 if (acl == NULL)
2652                         goto out;
2653                 acl->cached = 1;
2654                 memcpy(acl->data, buf, acl_len);
2655         } else {
2656                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2657                 if (acl == NULL)
2658                         goto out;
2659                 acl->cached = 0;
2660         }
2661         acl->len = acl_len;
2662 out:
2663         nfs4_set_cached_acl(inode, acl);
2664 }
2665
2666 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2667 {
2668         struct page *pages[NFS4ACL_MAXPAGES];
2669         struct nfs_getaclargs args = {
2670                 .fh = NFS_FH(inode),
2671                 .acl_pages = pages,
2672                 .acl_len = buflen,
2673         };
2674         size_t resp_len = buflen;
2675         void *resp_buf;
2676         struct rpc_message msg = {
2677                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2678                 .rpc_argp = &args,
2679                 .rpc_resp = &resp_len,
2680         };
2681         struct page *localpage = NULL;
2682         int ret;
2683
2684         if (buflen < PAGE_SIZE) {
2685                 /* As long as we're doing a round trip to the server anyway,
2686                  * let's be prepared for a page of acl data. */
2687                 localpage = alloc_page(GFP_KERNEL);
2688                 resp_buf = page_address(localpage);
2689                 if (localpage == NULL)
2690                         return -ENOMEM;
2691                 args.acl_pages[0] = localpage;
2692                 args.acl_pgbase = 0;
2693                 resp_len = args.acl_len = PAGE_SIZE;
2694         } else {
2695                 resp_buf = buf;
2696                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2697         }
2698         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2699         if (ret)
2700                 goto out_free;
2701         if (resp_len > args.acl_len)
2702                 nfs4_write_cached_acl(inode, NULL, resp_len);
2703         else
2704                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2705         if (buf) {
2706                 ret = -ERANGE;
2707                 if (resp_len > buflen)
2708                         goto out_free;
2709                 if (localpage)
2710                         memcpy(buf, resp_buf, resp_len);
2711         }
2712         ret = resp_len;
2713 out_free:
2714         if (localpage)
2715                 __free_page(localpage);
2716         return ret;
2717 }
2718
2719 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2720 {
2721         struct nfs4_exception exception = { };
2722         ssize_t ret;
2723         do {
2724                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2725                 if (ret >= 0)
2726                         break;
2727                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2728         } while (exception.retry);
2729         return ret;
2730 }
2731
2732 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2733 {
2734         struct nfs_server *server = NFS_SERVER(inode);
2735         int ret;
2736
2737         if (!nfs4_server_supports_acls(server))
2738                 return -EOPNOTSUPP;
2739         ret = nfs_revalidate_inode(server, inode);
2740         if (ret < 0)
2741                 return ret;
2742         ret = nfs4_read_cached_acl(inode, buf, buflen);
2743         if (ret != -ENOENT)
2744                 return ret;
2745         return nfs4_get_acl_uncached(inode, buf, buflen);
2746 }
2747
2748 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2749 {
2750         struct nfs_server *server = NFS_SERVER(inode);
2751         struct page *pages[NFS4ACL_MAXPAGES];
2752         struct nfs_setaclargs arg = {
2753                 .fh             = NFS_FH(inode),
2754                 .acl_pages      = pages,
2755                 .acl_len        = buflen,
2756         };
2757         struct rpc_message msg = {
2758                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2759                 .rpc_argp       = &arg,
2760                 .rpc_resp       = NULL,
2761         };
2762         int ret;
2763
2764         if (!nfs4_server_supports_acls(server))
2765                 return -EOPNOTSUPP;
2766         nfs_inode_return_delegation(inode);
2767         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2768         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2769         if (ret == 0)
2770                 nfs4_write_cached_acl(inode, buf, buflen);
2771         return ret;
2772 }
2773
2774 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2775 {
2776         struct nfs4_exception exception = { };
2777         int err;
2778         do {
2779                 err = nfs4_handle_exception(NFS_SERVER(inode),
2780                                 __nfs4_proc_set_acl(inode, buf, buflen),
2781                                 &exception);
2782         } while (exception.retry);
2783         return err;
2784 }
2785
2786 static int
2787 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2788 {
2789         struct nfs_client *clp = server->nfs_client;
2790
2791         if (!clp || task->tk_status >= 0)
2792                 return 0;
2793         switch(task->tk_status) {
2794                 case -NFS4ERR_STALE_CLIENTID:
2795                 case -NFS4ERR_STALE_STATEID:
2796                 case -NFS4ERR_EXPIRED:
2797                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2798                         nfs4_schedule_state_recovery(clp);
2799                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2800                                 rpc_wake_up_task(task);
2801                         task->tk_status = 0;
2802                         return -EAGAIN;
2803                 case -NFS4ERR_DELAY:
2804                         nfs_inc_server_stats((struct nfs_server *) server,
2805                                                 NFSIOS_DELAY);
2806                 case -NFS4ERR_GRACE:
2807                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2808                         task->tk_status = 0;
2809                         return -EAGAIN;
2810                 case -NFS4ERR_OLD_STATEID:
2811                         task->tk_status = 0;
2812                         return -EAGAIN;
2813         }
2814         task->tk_status = nfs4_map_errors(task->tk_status);
2815         return 0;
2816 }
2817
2818 static int nfs4_wait_bit_interruptible(void *word)
2819 {
2820         if (signal_pending(current))
2821                 return -ERESTARTSYS;
2822         schedule();
2823         return 0;
2824 }
2825
2826 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2827 {
2828         sigset_t oldset;
2829         int res;
2830
2831         might_sleep();
2832
2833         rpc_clnt_sigmask(clnt, &oldset);
2834         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2835                         nfs4_wait_bit_interruptible,
2836                         TASK_INTERRUPTIBLE);
2837         rpc_clnt_sigunmask(clnt, &oldset);
2838         return res;
2839 }
2840
2841 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2842 {
2843         sigset_t oldset;
2844         int res = 0;
2845
2846         might_sleep();
2847
2848         if (*timeout <= 0)
2849                 *timeout = NFS4_POLL_RETRY_MIN;
2850         if (*timeout > NFS4_POLL_RETRY_MAX)
2851                 *timeout = NFS4_POLL_RETRY_MAX;
2852         rpc_clnt_sigmask(clnt, &oldset);
2853         if (clnt->cl_intr) {
2854                 schedule_timeout_interruptible(*timeout);
2855                 if (signalled())
2856                         res = -ERESTARTSYS;
2857         } else
2858                 schedule_timeout_uninterruptible(*timeout);
2859         rpc_clnt_sigunmask(clnt, &oldset);
2860         *timeout <<= 1;
2861         return res;
2862 }
2863
2864 /* This is the error handling routine for processes that are allowed
2865  * to sleep.
2866  */
2867 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2868 {
2869         struct nfs_client *clp = server->nfs_client;
2870         int ret = errorcode;
2871
2872         exception->retry = 0;
2873         switch(errorcode) {
2874                 case 0:
2875                         return 0;
2876                 case -NFS4ERR_STALE_CLIENTID:
2877                 case -NFS4ERR_STALE_STATEID:
2878                 case -NFS4ERR_EXPIRED:
2879                         nfs4_schedule_state_recovery(clp);
2880                         ret = nfs4_wait_clnt_recover(server->client, clp);
2881                         if (ret == 0)
2882                                 exception->retry = 1;
2883                         break;
2884                 case -NFS4ERR_GRACE:
2885                 case -NFS4ERR_DELAY:
2886                         ret = nfs4_delay(server->client, &exception->timeout);
2887                         if (ret != 0)
2888                                 break;
2889                 case -NFS4ERR_OLD_STATEID:
2890                         exception->retry = 1;
2891         }
2892         /* We failed to handle the error */
2893         return nfs4_map_errors(ret);
2894 }
2895
2896 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2897 {
2898         nfs4_verifier sc_verifier;
2899         struct nfs4_setclientid setclientid = {
2900                 .sc_verifier = &sc_verifier,
2901                 .sc_prog = program,
2902         };
2903         struct rpc_message msg = {
2904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2905                 .rpc_argp = &setclientid,
2906                 .rpc_resp = clp,
2907                 .rpc_cred = cred,
2908         };
2909         u32 *p;
2910         int loop = 0;
2911         int status;
2912
2913         p = (u32*)sc_verifier.data;
2914         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2915         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2916
2917         for(;;) {
2918                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2919                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2920                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2921                                 cred->cr_ops->cr_name,
2922                                 clp->cl_id_uniquifier);
2923                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2924                                 sizeof(setclientid.sc_netid), "tcp");
2925                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2926                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2927                                 clp->cl_ipaddr, port >> 8, port & 255);
2928
2929                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2930                 if (status != -NFS4ERR_CLID_INUSE)
2931                         break;
2932                 if (signalled())
2933                         break;
2934                 if (loop++ & 1)
2935                         ssleep(clp->cl_lease_time + 1);
2936                 else
2937                         if (++clp->cl_id_uniquifier == 0)
2938                                 break;
2939         }
2940         return status;
2941 }
2942
2943 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2944 {
2945         struct nfs_fsinfo fsinfo;
2946         struct rpc_message msg = {
2947                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2948                 .rpc_argp = clp,
2949                 .rpc_resp = &fsinfo,
2950                 .rpc_cred = cred,
2951         };
2952         unsigned long now;
2953         int status;
2954
2955         now = jiffies;
2956         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2957         if (status == 0) {
2958                 spin_lock(&clp->cl_lock);
2959                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2960                 clp->cl_last_renewal = now;
2961                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2962                 spin_unlock(&clp->cl_lock);
2963         }
2964         return status;
2965 }
2966
2967 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2968 {
2969         long timeout;
2970         int err;
2971         do {
2972                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2973                 switch (err) {
2974                         case 0:
2975                                 return err;
2976                         case -NFS4ERR_RESOURCE:
2977                                 /* The IBM lawyers misread another document! */
2978                         case -NFS4ERR_DELAY:
2979                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2980                 }
2981         } while (err == 0);
2982         return err;
2983 }
2984
2985 struct nfs4_delegreturndata {
2986         struct nfs4_delegreturnargs args;
2987         struct nfs4_delegreturnres res;
2988         struct nfs_fh fh;
2989         nfs4_stateid stateid;
2990         struct rpc_cred *cred;
2991         unsigned long timestamp;
2992         struct nfs_fattr fattr;
2993         int rpc_status;
2994 };
2995
2996 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2997 {
2998         struct nfs4_delegreturndata *data = calldata;
2999         struct rpc_message msg = {
3000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3001                 .rpc_argp = &data->args,
3002                 .rpc_resp = &data->res,
3003                 .rpc_cred = data->cred,
3004         };
3005         nfs_fattr_init(data->res.fattr);
3006         rpc_call_setup(task, &msg, 0);
3007 }
3008
3009 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3010 {
3011         struct nfs4_delegreturndata *data = calldata;
3012         data->rpc_status = task->tk_status;
3013         if (data->rpc_status == 0)
3014                 renew_lease(data->res.server, data->timestamp);
3015 }
3016
3017 static void nfs4_delegreturn_release(void *calldata)
3018 {
3019         struct nfs4_delegreturndata *data = calldata;
3020
3021         put_rpccred(data->cred);
3022         kfree(calldata);
3023 }
3024
3025 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3026         .rpc_call_prepare = nfs4_delegreturn_prepare,
3027         .rpc_call_done = nfs4_delegreturn_done,
3028         .rpc_release = nfs4_delegreturn_release,
3029 };
3030
3031 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3032 {
3033         struct nfs4_delegreturndata *data;
3034         struct nfs_server *server = NFS_SERVER(inode);
3035         struct rpc_task *task;
3036         int status;
3037
3038         data = kmalloc(sizeof(*data), GFP_KERNEL);
3039         if (data == NULL)
3040                 return -ENOMEM;
3041         data->args.fhandle = &data->fh;
3042         data->args.stateid = &data->stateid;
3043         data->args.bitmask = server->attr_bitmask;
3044         nfs_copy_fh(&data->fh, NFS_FH(inode));
3045         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3046         data->res.fattr = &data->fattr;
3047         data->res.server = server;
3048         data->cred = get_rpccred(cred);
3049         data->timestamp = jiffies;
3050         data->rpc_status = 0;
3051
3052         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3053         if (IS_ERR(task))
3054                 return PTR_ERR(task);
3055         status = nfs4_wait_for_completion_rpc_task(task);
3056         if (status == 0) {
3057                 status = data->rpc_status;
3058                 if (status == 0)
3059                         nfs_post_op_update_inode(inode, &data->fattr);
3060         }
3061         rpc_release_task(task);
3062         return status;
3063 }
3064
3065 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3066 {
3067         struct nfs_server *server = NFS_SERVER(inode);
3068         struct nfs4_exception exception = { };
3069         int err;
3070         do {
3071                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3072                 switch (err) {
3073                         case -NFS4ERR_STALE_STATEID:
3074                         case -NFS4ERR_EXPIRED:
3075                                 nfs4_schedule_state_recovery(server->nfs_client);
3076                         case 0:
3077                                 return 0;
3078                 }
3079                 err = nfs4_handle_exception(server, err, &exception);
3080         } while (exception.retry);
3081         return err;
3082 }
3083
3084 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3085 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3086
3087 /*
3088  * sleep, with exponential backoff, and retry the LOCK operation.
3089  */
3090 static unsigned long
3091 nfs4_set_lock_task_retry(unsigned long timeout)
3092 {
3093         schedule_timeout_interruptible(timeout);
3094         timeout <<= 1;
3095         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3096                 return NFS4_LOCK_MAXTIMEOUT;
3097         return timeout;
3098 }
3099
3100 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3101 {
3102         struct inode *inode = state->inode;
3103         struct nfs_server *server = NFS_SERVER(inode);
3104         struct nfs_client *clp = server->nfs_client;
3105         struct nfs_lockt_args arg = {
3106                 .fh = NFS_FH(inode),
3107                 .fl = request,
3108         };
3109         struct nfs_lockt_res res = {
3110                 .denied = request,
3111         };
3112         struct rpc_message msg = {
3113                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3114                 .rpc_argp       = &arg,
3115                 .rpc_resp       = &res,
3116                 .rpc_cred       = state->owner->so_cred,
3117         };
3118         struct nfs4_lock_state *lsp;
3119         int status;
3120
3121         down_read(&clp->cl_sem);
3122         arg.lock_owner.clientid = clp->cl_clientid;
3123         status = nfs4_set_lock_state(state, request);
3124         if (status != 0)
3125                 goto out;
3126         lsp = request->fl_u.nfs4_fl.owner;
3127         arg.lock_owner.id = lsp->ls_id;
3128         status = rpc_call_sync(server->client, &msg, 0);
3129         switch (status) {
3130                 case 0:
3131                         request->fl_type = F_UNLCK;
3132                         break;
3133                 case -NFS4ERR_DENIED:
3134                         status = 0;
3135         }
3136 out:
3137         up_read(&clp->cl_sem);
3138         return status;
3139 }
3140
3141 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3142 {
3143         struct nfs4_exception exception = { };
3144         int err;
3145
3146         do {
3147                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3148                                 _nfs4_proc_getlk(state, cmd, request),
3149                                 &exception);
3150         } while (exception.retry);
3151         return err;
3152 }
3153
3154 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3155 {
3156         int res = 0;
3157         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3158                 case FL_POSIX:
3159                         res = posix_lock_file_wait(file, fl);
3160                         break;
3161                 case FL_FLOCK:
3162                         res = flock_lock_file_wait(file, fl);
3163                         break;
3164                 default:
3165                         BUG();
3166         }
3167         return res;
3168 }
3169
3170 struct nfs4_unlockdata {
3171         struct nfs_locku_args arg;
3172         struct nfs_locku_res res;
3173         struct nfs4_lock_state *lsp;
3174         struct nfs_open_context *ctx;
3175         struct file_lock fl;
3176         const struct nfs_server *server;
3177         unsigned long timestamp;
3178 };
3179
3180 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3181                 struct nfs_open_context *ctx,
3182                 struct nfs4_lock_state *lsp,
3183                 struct nfs_seqid *seqid)
3184 {
3185         struct nfs4_unlockdata *p;
3186         struct inode *inode = lsp->ls_state->inode;
3187
3188         p = kmalloc(sizeof(*p), GFP_KERNEL);
3189         if (p == NULL)
3190                 return NULL;
3191         p->arg.fh = NFS_FH(inode);
3192         p->arg.fl = &p->fl;
3193         p->arg.seqid = seqid;
3194         p->arg.stateid = &lsp->ls_stateid;
3195         p->lsp = lsp;
3196         atomic_inc(&lsp->ls_count);
3197         /* Ensure we don't close file until we're done freeing locks! */
3198         p->ctx = get_nfs_open_context(ctx);
3199         memcpy(&p->fl, fl, sizeof(p->fl));
3200         p->server = NFS_SERVER(inode);
3201         return p;
3202 }
3203
3204 static void nfs4_locku_release_calldata(void *data)
3205 {
3206         struct nfs4_unlockdata *calldata = data;
3207         nfs_free_seqid(calldata->arg.seqid);
3208         nfs4_put_lock_state(calldata->lsp);
3209         put_nfs_open_context(calldata->ctx);
3210         kfree(calldata);
3211 }
3212
3213 static void nfs4_locku_done(struct rpc_task *task, void *data)
3214 {
3215         struct nfs4_unlockdata *calldata = data;
3216
3217         if (RPC_ASSASSINATED(task))
3218                 return;
3219         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3220         switch (task->tk_status) {
3221                 case 0:
3222                         memcpy(calldata->lsp->ls_stateid.data,
3223                                         calldata->res.stateid.data,
3224                                         sizeof(calldata->lsp->ls_stateid.data));
3225                         renew_lease(calldata->server, calldata->timestamp);
3226                         break;
3227                 case -NFS4ERR_STALE_STATEID:
3228                 case -NFS4ERR_EXPIRED:
3229                         nfs4_schedule_state_recovery(calldata->server->nfs_client);
3230                         break;
3231                 default:
3232                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3233                                 rpc_restart_call(task);
3234                         }
3235         }
3236 }
3237
3238 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3239 {
3240         struct nfs4_unlockdata *calldata = data;
3241         struct rpc_message msg = {
3242                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3243                 .rpc_argp       = &calldata->arg,
3244                 .rpc_resp       = &calldata->res,
3245                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3246         };
3247
3248         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3249                 return;
3250         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3251                 /* Note: exit _without_ running nfs4_locku_done */
3252                 task->tk_action = NULL;
3253                 return;
3254         }
3255         calldata->timestamp = jiffies;
3256         rpc_call_setup(task, &msg, 0);
3257 }
3258
3259 static const struct rpc_call_ops nfs4_locku_ops = {
3260         .rpc_call_prepare = nfs4_locku_prepare,
3261         .rpc_call_done = nfs4_locku_done,
3262         .rpc_release = nfs4_locku_release_calldata,
3263 };
3264
3265 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3266                 struct nfs_open_context *ctx,
3267                 struct nfs4_lock_state *lsp,
3268                 struct nfs_seqid *seqid)
3269 {
3270         struct nfs4_unlockdata *data;
3271
3272         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3273         if (data == NULL) {
3274                 nfs_free_seqid(seqid);
3275                 return ERR_PTR(-ENOMEM);
3276         }
3277
3278         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3279 }
3280
3281 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3282 {
3283         struct nfs_seqid *seqid;
3284         struct nfs4_lock_state *lsp;
3285         struct rpc_task *task;
3286         int status = 0;
3287
3288         status = nfs4_set_lock_state(state, request);
3289         /* Unlock _before_ we do the RPC call */
3290         request->fl_flags |= FL_EXISTS;
3291         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3292                 goto out;
3293         if (status != 0)
3294                 goto out;
3295         /* Is this a delegated lock? */
3296         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3297                 goto out;
3298         lsp = request->fl_u.nfs4_fl.owner;
3299         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3300         status = -ENOMEM;
3301         if (seqid == NULL)
3302                 goto out;
3303         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3304         status = PTR_ERR(task);
3305         if (IS_ERR(task))
3306                 goto out;
3307         status = nfs4_wait_for_completion_rpc_task(task);
3308         rpc_release_task(task);
3309 out:
3310         return status;
3311 }
3312
3313 struct nfs4_lockdata {
3314         struct nfs_lock_args arg;
3315         struct nfs_lock_res res;
3316         struct nfs4_lock_state *lsp;
3317         struct nfs_open_context *ctx;
3318         struct file_lock fl;
3319         unsigned long timestamp;
3320         int rpc_status;
3321         int cancelled;
3322 };
3323
3324 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3325                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3326 {
3327         struct nfs4_lockdata *p;
3328         struct inode *inode = lsp->ls_state->inode;
3329         struct nfs_server *server = NFS_SERVER(inode);
3330
3331         p = kzalloc(sizeof(*p), GFP_KERNEL);
3332         if (p == NULL)
3333                 return NULL;
3334
3335         p->arg.fh = NFS_FH(inode);
3336         p->arg.fl = &p->fl;
3337         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3338         if (p->arg.lock_seqid == NULL)
3339                 goto out_free;
3340         p->arg.lock_stateid = &lsp->ls_stateid;
3341         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3342         p->arg.lock_owner.id = lsp->ls_id;
3343         p->lsp = lsp;
3344         atomic_inc(&lsp->ls_count);
3345         p->ctx = get_nfs_open_context(ctx);
3346         memcpy(&p->fl, fl, sizeof(p->fl));
3347         return p;
3348 out_free:
3349         kfree(p);
3350         return NULL;
3351 }
3352
3353 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3354 {
3355         struct nfs4_lockdata *data = calldata;
3356         struct nfs4_state *state = data->lsp->ls_state;
3357         struct nfs4_state_owner *sp = state->owner;
3358         struct rpc_message msg = {
3359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3360                 .rpc_argp = &data->arg,
3361                 .rpc_resp = &data->res,
3362                 .rpc_cred = sp->so_cred,
3363         };
3364
3365         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3366                 return;
3367         dprintk("%s: begin!\n", __FUNCTION__);
3368         /* Do we need to do an open_to_lock_owner? */
3369         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3370                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3371                 if (data->arg.open_seqid == NULL) {
3372                         data->rpc_status = -ENOMEM;
3373                         task->tk_action = NULL;
3374                         goto out;
3375                 }
3376                 data->arg.open_stateid = &state->stateid;
3377                 data->arg.new_lock_owner = 1;
3378         }
3379         data->timestamp = jiffies;
3380         rpc_call_setup(task, &msg, 0);
3381 out:
3382         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3383 }
3384
3385 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3386 {
3387         struct nfs4_lockdata *data = calldata;
3388
3389         dprintk("%s: begin!\n", __FUNCTION__);
3390
3391         data->rpc_status = task->tk_status;
3392         if (RPC_ASSASSINATED(task))
3393                 goto out;
3394         if (data->arg.new_lock_owner != 0) {
3395                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3396                 if (data->rpc_status == 0)
3397                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3398                 else
3399                         goto out;
3400         }
3401         if (data->rpc_status == 0) {
3402                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3403                                         sizeof(data->lsp->ls_stateid.data));
3404                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3405                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3406         }
3407         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3408 out:
3409         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3410 }
3411
3412 static void nfs4_lock_release(void *calldata)
3413 {
3414         struct nfs4_lockdata *data = calldata;
3415
3416         dprintk("%s: begin!\n", __FUNCTION__);
3417         if (data->arg.open_seqid != NULL)
3418                 nfs_free_seqid(data->arg.open_seqid);
3419         if (data->cancelled != 0) {
3420                 struct rpc_task *task;
3421                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3422                                 data->arg.lock_seqid);
3423                 if (!IS_ERR(task))
3424                         rpc_release_task(task);
3425                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3426         } else
3427                 nfs_free_seqid(data->arg.lock_seqid);
3428         nfs4_put_lock_state(data->lsp);
3429         put_nfs_open_context(data->ctx);
3430         kfree(data);
3431         dprintk("%s: done!\n", __FUNCTION__);
3432 }
3433
3434 static const struct rpc_call_ops nfs4_lock_ops = {
3435         .rpc_call_prepare = nfs4_lock_prepare,
3436         .rpc_call_done = nfs4_lock_done,
3437         .rpc_release = nfs4_lock_release,
3438 };
3439
3440 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3441 {
3442         struct nfs4_lockdata *data;
3443         struct rpc_task *task;
3444         int ret;
3445
3446         dprintk("%s: begin!\n", __FUNCTION__);
3447         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3448                         fl->fl_u.nfs4_fl.owner);
3449         if (data == NULL)
3450                 return -ENOMEM;
3451         if (IS_SETLKW(cmd))
3452                 data->arg.block = 1;
3453         if (reclaim != 0)
3454                 data->arg.reclaim = 1;
3455         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3456                         &nfs4_lock_ops, data);
3457         if (IS_ERR(task))
3458                 return PTR_ERR(task);
3459         ret = nfs4_wait_for_completion_rpc_task(task);
3460         if (ret == 0) {
3461                 ret = data->rpc_status;
3462                 if (ret == -NFS4ERR_DENIED)
3463                         ret = -EAGAIN;
3464         } else
3465                 data->cancelled = 1;
3466         rpc_release_task(task);
3467         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3468         return ret;
3469 }
3470
3471 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3472 {
3473         struct nfs_server *server = NFS_SERVER(state->inode);
3474         struct nfs4_exception exception = { };
3475         int err;
3476
3477         do {
3478                 /* Cache the lock if possible... */
3479                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3480                         return 0;
3481                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3482                 if (err != -NFS4ERR_DELAY)
3483                         break;
3484                 nfs4_handle_exception(server, err, &exception);
3485         } while (exception.retry);
3486         return err;
3487 }
3488
3489 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3490 {
3491         struct nfs_server *server = NFS_SERVER(state->inode);
3492         struct nfs4_exception exception = { };
3493         int err;
3494
3495         err = nfs4_set_lock_state(state, request);
3496         if (err != 0)
3497                 return err;
3498         do {
3499                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3500                         return 0;
3501                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3502                 if (err != -NFS4ERR_DELAY)
3503                         break;
3504                 nfs4_handle_exception(server, err, &exception);
3505         } while (exception.retry);
3506         return err;
3507 }
3508
3509 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3510 {
3511         struct nfs_client *clp = state->owner->so_client;
3512         unsigned char fl_flags = request->fl_flags;
3513         int status;
3514
3515         /* Is this a delegated open? */
3516         status = nfs4_set_lock_state(state, request);
3517         if (status != 0)
3518                 goto out;
3519         request->fl_flags |= FL_ACCESS;
3520         status = do_vfs_lock(request->fl_file, request);
3521         if (status < 0)
3522                 goto out;
3523         down_read(&clp->cl_sem);
3524         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3525                 struct nfs_inode *nfsi = NFS_I(state->inode);
3526                 /* Yes: cache locks! */
3527                 down_read(&nfsi->rwsem);
3528                 /* ...but avoid races with delegation recall... */
3529                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3530                         request->fl_flags = fl_flags & ~FL_SLEEP;
3531                         status = do_vfs_lock(request->fl_file, request);
3532                         up_read(&nfsi->rwsem);
3533                         goto out_unlock;
3534                 }
3535                 up_read(&nfsi->rwsem);
3536         }
3537         status = _nfs4_do_setlk(state, cmd, request, 0);
3538         if (status != 0)
3539                 goto out_unlock;
3540         /* Note: we always want to sleep here! */
3541         request->fl_flags = fl_flags | FL_SLEEP;
3542         if (do_vfs_lock(request->fl_file, request) < 0)
3543                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3544 out_unlock:
3545         up_read(&clp->cl_sem);
3546 out:
3547         request->fl_flags = fl_flags;
3548         return status;
3549 }
3550
3551 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3552 {
3553         struct nfs4_exception exception = { };
3554         int err;
3555
3556         do {
3557                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3558                                 _nfs4_proc_setlk(state, cmd, request),
3559                                 &exception);
3560         } while (exception.retry);
3561         return err;
3562 }
3563
3564 static int
3565 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3566 {
3567         struct nfs_open_context *ctx;
3568         struct nfs4_state *state;
3569         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3570         int status;
3571
3572         /* verify open state */
3573         ctx = (struct nfs_open_context *)filp->private_data;
3574         state = ctx->state;
3575
3576         if (request->fl_start < 0 || request->fl_end < 0)
3577                 return -EINVAL;
3578
3579         if (IS_GETLK(cmd))
3580                 return nfs4_proc_getlk(state, F_GETLK, request);
3581
3582         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3583                 return -EINVAL;
3584
3585         if (request->fl_type == F_UNLCK)
3586                 return nfs4_proc_unlck(state, cmd, request);
3587
3588         do {
3589                 status = nfs4_proc_setlk(state, cmd, request);
3590                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3591                         break;
3592                 timeout = nfs4_set_lock_task_retry(timeout);
3593                 status = -ERESTARTSYS;
3594                 if (signalled())
3595                         break;
3596         } while(status < 0);
3597         return status;
3598 }
3599
3600 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3601 {
3602         struct nfs_server *server = NFS_SERVER(state->inode);
3603         struct nfs4_exception exception = { };
3604         int err;
3605
3606         err = nfs4_set_lock_state(state, fl);
3607         if (err != 0)
3608                 goto out;
3609         do {
3610                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3611                 if (err != -NFS4ERR_DELAY)
3612                         break;
3613                 err = nfs4_handle_exception(server, err, &exception);
3614         } while (exception.retry);
3615 out:
3616         return err;
3617 }
3618
3619 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3620
3621 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3622                 size_t buflen, int flags)
3623 {
3624         struct inode *inode = dentry->d_inode;
3625
3626         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3627                 return -EOPNOTSUPP;
3628
3629         if (!S_ISREG(inode->i_mode) &&
3630             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3631                 return -EPERM;
3632
3633         return nfs4_proc_set_acl(inode, buf, buflen);
3634 }
3635
3636 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3637  * and that's what we'll do for e.g. user attributes that haven't been set.
3638  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3639  * attributes in kernel-managed attribute namespaces. */
3640 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3641                 size_t buflen)
3642 {
3643         struct inode *inode = dentry->d_inode;
3644
3645         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3646                 return -EOPNOTSUPP;
3647
3648         return nfs4_proc_get_acl(inode, buf, buflen);
3649 }
3650
3651 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3652 {
3653         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3654
3655         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3656                 return 0;
3657         if (buf && buflen < len)
3658                 return -ERANGE;
3659         if (buf)
3660                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3661         return len;
3662 }
3663
3664 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3665                 struct nfs4_fs_locations *fs_locations, struct page *page)
3666 {
3667         struct nfs_server *server = NFS_SERVER(dir);
3668         u32 bitmask[2] = {
3669                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3670                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3671         };
3672         struct nfs4_fs_locations_arg args = {
3673                 .dir_fh = NFS_FH(dir),
3674                 .name = &dentry->d_name,
3675                 .page = page,
3676                 .bitmask = bitmask,
3677         };
3678         struct rpc_message msg = {
3679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3680                 .rpc_argp = &args,
3681                 .rpc_resp = fs_locations,
3682         };
3683         int status;
3684
3685         dprintk("%s: start\n", __FUNCTION__);
3686         fs_locations->fattr.valid = 0;
3687         fs_locations->server = server;
3688         fs_locations->nlocations = 0;
3689         status = rpc_call_sync(server->client, &msg, 0);
3690         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3691         return status;
3692 }
3693
3694 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3695         .recover_open   = nfs4_open_reclaim,
3696         .recover_lock   = nfs4_lock_reclaim,
3697 };
3698
3699 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3700         .recover_open   = nfs4_open_expired,
3701         .recover_lock   = nfs4_lock_expired,
3702 };
3703
3704 static struct inode_operations nfs4_file_inode_operations = {
3705         .permission     = nfs_permission,
3706         .getattr        = nfs_getattr,
3707         .setattr        = nfs_setattr,
3708         .getxattr       = nfs4_getxattr,
3709         .setxattr       = nfs4_setxattr,
3710         .listxattr      = nfs4_listxattr,
3711 };
3712
3713 const struct nfs_rpc_ops nfs_v4_clientops = {
3714         .version        = 4,                    /* protocol version */
3715         .dentry_ops     = &nfs4_dentry_operations,
3716         .dir_inode_ops  = &nfs4_dir_inode_operations,
3717         .file_inode_ops = &nfs4_file_inode_operations,
3718         .getroot        = nfs4_proc_get_root,
3719         .getattr        = nfs4_proc_getattr,
3720         .setattr        = nfs4_proc_setattr,
3721         .lookupfh       = nfs4_proc_lookupfh,
3722         .lookup         = nfs4_proc_lookup,
3723         .access         = nfs4_proc_access,
3724         .readlink       = nfs4_proc_readlink,
3725         .read           = nfs4_proc_read,
3726         .write          = nfs4_proc_write,
3727         .commit         = nfs4_proc_commit,
3728         .create         = nfs4_proc_create,
3729         .remove         = nfs4_proc_remove,
3730         .unlink_setup   = nfs4_proc_unlink_setup,
3731         .unlink_done    = nfs4_proc_unlink_done,
3732         .rename         = nfs4_proc_rename,
3733         .link           = nfs4_proc_link,
3734         .symlink        = nfs4_proc_symlink,
3735         .mkdir          = nfs4_proc_mkdir,
3736         .rmdir          = nfs4_proc_remove,
3737         .readdir        = nfs4_proc_readdir,
3738         .mknod          = nfs4_proc_mknod,
3739         .statfs         = nfs4_proc_statfs,
3740         .fsinfo         = nfs4_proc_fsinfo,
3741         .pathconf       = nfs4_proc_pathconf,
3742         .set_capabilities = nfs4_server_capabilities,
3743         .decode_dirent  = nfs4_decode_dirent,
3744         .read_setup     = nfs4_proc_read_setup,
3745         .read_done      = nfs4_read_done,
3746         .write_setup    = nfs4_proc_write_setup,
3747         .write_done     = nfs4_write_done,
3748         .commit_setup   = nfs4_proc_commit_setup,
3749         .commit_done    = nfs4_commit_done,
3750         .file_open      = nfs_open,
3751         .file_release   = nfs_release,
3752         .lock           = nfs4_proc_lock,
3753         .clear_acl_cache = nfs4_zap_acl_attr,
3754 };
3755
3756 /*
3757  * Local variables:
3758  *  c-basic-offset: 8
3759  * End:
3760  */