git.oblomov.eu Git - linux-2.6/blob - fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68
  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, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, 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_put_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_put_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         int ret;
 797
 798         for (;;) {
 799                 ret = nfs4_wait_clnt_recover(server->client, clp);
 800                 if (ret != 0)
 801                         return ret;
 802                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 803                         break;
 804                 nfs4_schedule_state_recovery(clp);
 805         }
 806         return 0;
 807 }
 808
 809 /*
 810  * OPEN_EXPIRED:
 811  *      reclaim state on the server after a network partition.
 812  *      Assumes caller holds the appropriate lock
 813  */
 814 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 815 {
 816         struct inode *inode = state->inode;
 817         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 818         struct nfs4_opendata *opendata;
 819         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 820         int ret;
 821
 822         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 823                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 824                 if (ret < 0)
 825                         return ret;
 826                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 827                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 828                 return 0;
 829         }
 830         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 831         if (opendata == NULL)
 832                 return -ENOMEM;
 833         ret = nfs4_open_recover(opendata, state);
 834         if (ret == -ESTALE) {
 835                 /* Invalidate the state owner so we don't ever use it again */
 836                 nfs4_drop_state_owner(sp);
 837                 d_drop(dentry);
 838         }
 839         nfs4_opendata_free(opendata);
 840         return ret;
 841 }
 842
 843 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 844 {
 845         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 846         struct nfs4_exception exception = { };
 847         int err;
 848
 849         do {
 850                 err = _nfs4_open_expired(sp, state, dentry);
 851                 if (err == -NFS4ERR_DELAY)
 852                         nfs4_handle_exception(server, err, &exception);
 853         } while (exception.retry);
 854         return err;
 855 }
 856
 857 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 858 {
 859         struct nfs_open_context *ctx;
 860         int ret;
 861
 862         ctx = nfs4_state_find_open_context(state);
 863         if (IS_ERR(ctx))
 864                 return PTR_ERR(ctx);
 865         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 866         put_nfs_open_context(ctx);
 867         return ret;
 868 }
 869
 870 /*
 871  * Returns a referenced nfs4_state if there is an open delegation on the file
 872  */
 873 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 874 {
 875         struct nfs_delegation *delegation;
 876         struct nfs_server *server = NFS_SERVER(inode);
 877         struct nfs_client *clp = server->nfs_client;
 878         struct nfs_inode *nfsi = NFS_I(inode);
 879         struct nfs4_state_owner *sp = NULL;
 880         struct nfs4_state *state = NULL;
 881         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 882         int err;
 883
 884         err = -ENOMEM;
 885         if (!(sp = nfs4_get_state_owner(server, cred))) {
 886                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 887                 return err;
 888         }
 889         err = nfs4_recover_expired_lease(server);
 890         if (err != 0)
 891                 goto out_put_state_owner;
 892         /* Protect against reboot recovery - NOTE ORDER! */
 893         down_read(&clp->cl_sem);
 894         /* Protect against delegation recall */
 895         down_read(&nfsi->rwsem);
 896         delegation = NFS_I(inode)->delegation;
 897         err = -ENOENT;
 898         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 899                 goto out_err;
 900         err = -ENOMEM;
 901         state = nfs4_get_open_state(inode, sp);
 902         if (state == NULL)
 903                 goto out_err;
 904
 905         err = -ENOENT;
 906         if ((state->state & open_flags) == open_flags) {
 907                 spin_lock(&inode->i_lock);
 908                 update_open_stateflags(state, open_flags);
 909                 spin_unlock(&inode->i_lock);
 910                 goto out_ok;
 911         } else if (state->state != 0)
 912                 goto out_put_open_state;
 913
 914         lock_kernel();
 915         err = _nfs4_do_access(inode, cred, open_flags);
 916         unlock_kernel();
 917         if (err != 0)
 918                 goto out_put_open_state;
 919         set_bit(NFS_DELEGATED_STATE, &state->flags);
 920         update_open_stateid(state, &delegation->stateid, open_flags);
 921 out_ok:
 922         nfs4_put_state_owner(sp);
 923         up_read(&nfsi->rwsem);
 924         up_read(&clp->cl_sem);
 925         *res = state;
 926         return 0;
 927 out_put_open_state:
 928         nfs4_put_open_state(state);
 929 out_err:
 930         up_read(&nfsi->rwsem);
 931         up_read(&clp->cl_sem);
 932         if (err != -EACCES)
 933                 nfs_inode_return_delegation(inode);
 934 out_put_state_owner:
 935         nfs4_put_state_owner(sp);
 936         return err;
 937 }
 938
 939 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 940 {
 941         struct nfs4_exception exception = { };
 942         struct nfs4_state *res = ERR_PTR(-EIO);
 943         int err;
 944
 945         do {
 946                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 947                 if (err == 0)
 948                         break;
 949                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 950                                         err, &exception));
 951         } while (exception.retry);
 952         return res;
 953 }
 954
 955 /*
 956  * Returns a referenced nfs4_state
 957  */
 958 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 959 {
 960         struct nfs4_state_owner  *sp;
 961         struct nfs4_state     *state = NULL;
 962         struct nfs_server       *server = NFS_SERVER(dir);
 963         struct nfs_client *clp = server->nfs_client;
 964         struct nfs4_opendata *opendata;
 965         int                     status;
 966
 967         /* Protect against reboot recovery conflicts */
 968         status = -ENOMEM;
 969         if (!(sp = nfs4_get_state_owner(server, cred))) {
 970                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 971                 goto out_err;
 972         }
 973         status = nfs4_recover_expired_lease(server);
 974         if (status != 0)
 975                 goto err_put_state_owner;
 976         down_read(&clp->cl_sem);
 977         status = -ENOMEM;
 978         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 979         if (opendata == NULL)
 980                 goto err_release_rwsem;
 981
 982         status = _nfs4_proc_open(opendata);
 983         if (status != 0)
 984                 goto err_opendata_free;
 985
 986         status = -ENOMEM;
 987         state = nfs4_opendata_to_nfs4_state(opendata);
 988         if (state == NULL)
 989                 goto err_opendata_free;
 990         if (opendata->o_res.delegation_type != 0)
 991                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 992         nfs4_opendata_free(opendata);
 993         nfs4_put_state_owner(sp);
 994         up_read(&clp->cl_sem);
 995         *res = state;
 996         return 0;
 997 err_opendata_free:
 998         nfs4_opendata_free(opendata);
 999 err_release_rwsem:
1000         up_read(&clp->cl_sem);
1001 err_put_state_owner:
1002         nfs4_put_state_owner(sp);
1003 out_err:
1004         *res = NULL;
1005         return status;
1006 }
1007
1008
1009 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1010 {
1011         struct nfs4_exception exception = { };
1012         struct nfs4_state *res;
1013         int status;
1014
1015         do {
1016                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1017                 if (status == 0)
1018                         break;
1019                 /* NOTE: BAD_SEQID means the server and client disagree about the
1020                  * book-keeping w.r.t. state-changing operations
1021                  * (OPEN/CLOSE/LOCK/LOCKU...)
1022                  * It is actually a sign of a bug on the client or on the server.
1023                  *
1024                  * If we receive a BAD_SEQID error in the particular case of
1025                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1026                  * have unhashed the old state_owner for us, and that we can
1027                  * therefore safely retry using a new one. We should still warn
1028                  * the user though...
1029                  */
1030                 if (status == -NFS4ERR_BAD_SEQID) {
1031                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1032                         exception.retry = 1;
1033                         continue;
1034                 }
1035                 /*
1036                  * BAD_STATEID on OPEN means that the server cancelled our
1037                  * state before it received the OPEN_CONFIRM.
1038                  * Recover by retrying the request as per the discussion
1039                  * on Page 181 of RFC3530.
1040                  */
1041                 if (status == -NFS4ERR_BAD_STATEID) {
1042                         exception.retry = 1;
1043                         continue;
1044                 }
1045                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1046                                         status, &exception));
1047         } while (exception.retry);
1048         return res;
1049 }
1050
1051 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1052                 struct iattr *sattr, struct nfs4_state *state)
1053 {
1054         struct nfs_server *server = NFS_SERVER(inode);
1055         struct nfs_setattrargs  arg = {
1056                 .fh             = NFS_FH(inode),
1057                 .iap            = sattr,
1058                 .server         = server,
1059                 .bitmask = server->attr_bitmask,
1060         };
1061         struct nfs_setattrres  res = {
1062                 .fattr          = fattr,
1063                 .server         = server,
1064         };
1065         struct rpc_message msg = {
1066                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1067                 .rpc_argp       = &arg,
1068                 .rpc_resp       = &res,
1069         };
1070         unsigned long timestamp = jiffies;
1071         int status;
1072
1073         nfs_fattr_init(fattr);
1074
1075         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1076                 /* Use that stateid */
1077         } else if (state != NULL) {
1078                 msg.rpc_cred = state->owner->so_cred;
1079                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1080         } else
1081                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1082
1083         status = rpc_call_sync(server->client, &msg, 0);
1084         if (status == 0 && state != NULL)
1085                 renew_lease(server, timestamp);
1086         return status;
1087 }
1088
1089 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1090                 struct iattr *sattr, struct nfs4_state *state)
1091 {
1092         struct nfs_server *server = NFS_SERVER(inode);
1093         struct nfs4_exception exception = { };
1094         int err;
1095         do {
1096                 err = nfs4_handle_exception(server,
1097                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1098                                 &exception);
1099         } while (exception.retry);
1100         return err;
1101 }
1102
1103 struct nfs4_closedata {
1104         struct inode *inode;
1105         struct nfs4_state *state;
1106         struct nfs_closeargs arg;
1107         struct nfs_closeres res;
1108         struct nfs_fattr fattr;
1109         unsigned long timestamp;
1110 };
1111
1112 static void nfs4_free_closedata(void *data)
1113 {
1114         struct nfs4_closedata *calldata = data;
1115         struct nfs4_state_owner *sp = calldata->state->owner;
1116
1117         nfs4_put_open_state(calldata->state);
1118         nfs_free_seqid(calldata->arg.seqid);
1119         nfs4_put_state_owner(sp);
1120         kfree(calldata);
1121 }
1122
1123 static void nfs4_close_done(struct rpc_task *task, void *data)
1124 {
1125         struct nfs4_closedata *calldata = data;
1126         struct nfs4_state *state = calldata->state;
1127         struct nfs_server *server = NFS_SERVER(calldata->inode);
1128
1129         if (RPC_ASSASSINATED(task))
1130                 return;
1131         /* hmm. we are done with the inode, and in the process of freeing
1132          * the state_owner. we keep this around to process errors
1133          */
1134         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1135         switch (task->tk_status) {
1136                 case 0:
1137                         memcpy(&state->stateid, &calldata->res.stateid,
1138                                         sizeof(state->stateid));
1139                         renew_lease(server, calldata->timestamp);
1140                         break;
1141                 case -NFS4ERR_STALE_STATEID:
1142                 case -NFS4ERR_EXPIRED:
1143                         nfs4_schedule_state_recovery(server->nfs_client);
1144                         break;
1145                 default:
1146                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1147                                 rpc_restart_call(task);
1148                                 return;
1149                         }
1150         }
1151         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1152 }
1153
1154 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1155 {
1156         struct nfs4_closedata *calldata = data;
1157         struct nfs4_state *state = calldata->state;
1158         struct rpc_message msg = {
1159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1160                 .rpc_argp = &calldata->arg,
1161                 .rpc_resp = &calldata->res,
1162                 .rpc_cred = state->owner->so_cred,
1163         };
1164         int mode = 0, old_mode;
1165
1166         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1167                 return;
1168         /* Recalculate the new open mode in case someone reopened the file
1169          * while we were waiting in line to be scheduled.
1170          */
1171         spin_lock(&state->owner->so_lock);
1172         spin_lock(&calldata->inode->i_lock);
1173         mode = old_mode = state->state;
1174         if (state->n_rdwr == 0) {
1175                 if (state->n_rdonly == 0)
1176                         mode &= ~FMODE_READ;
1177                 if (state->n_wronly == 0)
1178                         mode &= ~FMODE_WRITE;
1179         }
1180         nfs4_state_set_mode_locked(state, mode);
1181         spin_unlock(&calldata->inode->i_lock);
1182         spin_unlock(&state->owner->so_lock);
1183         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1184                 /* Note: exit _without_ calling nfs4_close_done */
1185                 task->tk_action = NULL;
1186                 return;
1187         }
1188         nfs_fattr_init(calldata->res.fattr);
1189         if (mode != 0)
1190                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1191         calldata->arg.open_flags = mode;
1192         calldata->timestamp = jiffies;
1193         rpc_call_setup(task, &msg, 0);
1194 }
1195
1196 static const struct rpc_call_ops nfs4_close_ops = {
1197         .rpc_call_prepare = nfs4_close_prepare,
1198         .rpc_call_done = nfs4_close_done,
1199         .rpc_release = nfs4_free_closedata,
1200 };
1201
1202 /*
1203  * It is possible for data to be read/written from a mem-mapped file
1204  * after the sys_close call (which hits the vfs layer as a flush).
1205  * This means that we can't safely call nfsv4 close on a file until
1206  * the inode is cleared. This in turn means that we are not good
1207  * NFSv4 citizens - we do not indicate to the server to update the file's
1208  * share state even when we are done with one of the three share
1209  * stateid's in the inode.
1210  *
1211  * NOTE: Caller must be holding the sp->so_owner semaphore!
1212  */
1213 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1214 {
1215         struct nfs_server *server = NFS_SERVER(inode);
1216         struct nfs4_closedata *calldata;
1217         int status = -ENOMEM;
1218
1219         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1220         if (calldata == NULL)
1221                 goto out;
1222         calldata->inode = inode;
1223         calldata->state = state;
1224         calldata->arg.fh = NFS_FH(inode);
1225         calldata->arg.stateid = &state->stateid;
1226         /* Serialization for the sequence id */
1227         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1228         if (calldata->arg.seqid == NULL)
1229                 goto out_free_calldata;
1230         calldata->arg.bitmask = server->attr_bitmask;
1231         calldata->res.fattr = &calldata->fattr;
1232         calldata->res.server = server;
1233
1234         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1235         if (status == 0)
1236                 goto out;
1237
1238         nfs_free_seqid(calldata->arg.seqid);
1239 out_free_calldata:
1240         kfree(calldata);
1241 out:
1242         return status;
1243 }
1244
1245 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1246 {
1247         struct file *filp;
1248
1249         filp = lookup_instantiate_filp(nd, dentry, NULL);
1250         if (!IS_ERR(filp)) {
1251                 struct nfs_open_context *ctx;
1252                 ctx = (struct nfs_open_context *)filp->private_data;
1253                 ctx->state = state;
1254                 return 0;
1255         }
1256         nfs4_close_state(state, nd->intent.open.flags);
1257         return PTR_ERR(filp);
1258 }
1259
1260 struct dentry *
1261 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1262 {
1263         struct iattr attr;
1264         struct rpc_cred *cred;
1265         struct nfs4_state *state;
1266         struct dentry *res;
1267
1268         if (nd->flags & LOOKUP_CREATE) {
1269                 attr.ia_mode = nd->intent.open.create_mode;
1270                 attr.ia_valid = ATTR_MODE;
1271                 if (!IS_POSIXACL(dir))
1272                         attr.ia_mode &= ~current->fs->umask;
1273         } else {
1274                 attr.ia_valid = 0;
1275                 BUG_ON(nd->intent.open.flags & O_CREAT);
1276         }
1277
1278         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1279         if (IS_ERR(cred))
1280                 return (struct dentry *)cred;
1281         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1282         put_rpccred(cred);
1283         if (IS_ERR(state)) {
1284                 if (PTR_ERR(state) == -ENOENT)
1285                         d_add(dentry, NULL);
1286                 return (struct dentry *)state;
1287         }
1288         res = d_add_unique(dentry, igrab(state->inode));
1289         if (res != NULL)
1290                 dentry = res;
1291         nfs4_intent_set_file(nd, dentry, state);
1292         return res;
1293 }
1294
1295 int
1296 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1297 {
1298         struct rpc_cred *cred;
1299         struct nfs4_state *state;
1300
1301         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1302         if (IS_ERR(cred))
1303                 return PTR_ERR(cred);
1304         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1305         if (IS_ERR(state))
1306                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1307         put_rpccred(cred);
1308         if (IS_ERR(state)) {
1309                 switch (PTR_ERR(state)) {
1310                         case -EPERM:
1311                         case -EACCES:
1312                         case -EDQUOT:
1313                         case -ENOSPC:
1314                         case -EROFS:
1315                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1316                                 return 1;
1317                         default:
1318                                 goto out_drop;
1319                 }
1320         }
1321         if (state->inode == dentry->d_inode) {
1322                 nfs4_intent_set_file(nd, dentry, state);
1323                 return 1;
1324         }
1325         nfs4_close_state(state, openflags);
1326 out_drop:
1327         d_drop(dentry);
1328         return 0;
1329 }
1330
1331
1332 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1333 {
1334         struct nfs4_server_caps_res res = {};
1335         struct rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1337                 .rpc_argp = fhandle,
1338                 .rpc_resp = &res,
1339         };
1340         int status;
1341
1342         status = rpc_call_sync(server->client, &msg, 0);
1343         if (status == 0) {
1344                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1345                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1346                         server->caps |= NFS_CAP_ACLS;
1347                 if (res.has_links != 0)
1348                         server->caps |= NFS_CAP_HARDLINKS;
1349                 if (res.has_symlinks != 0)
1350                         server->caps |= NFS_CAP_SYMLINKS;
1351                 server->acl_bitmask = res.acl_bitmask;
1352         }
1353         return status;
1354 }
1355
1356 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1357 {
1358         struct nfs4_exception exception = { };
1359         int err;
1360         do {
1361                 err = nfs4_handle_exception(server,
1362                                 _nfs4_server_capabilities(server, fhandle),
1363                                 &exception);
1364         } while (exception.retry);
1365         return err;
1366 }
1367
1368 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1369                 struct nfs_fsinfo *info)
1370 {
1371         struct nfs4_lookup_root_arg args = {
1372                 .bitmask = nfs4_fattr_bitmap,
1373         };
1374         struct nfs4_lookup_res res = {
1375                 .server = server,
1376                 .fattr = info->fattr,
1377                 .fh = fhandle,
1378         };
1379         struct rpc_message msg = {
1380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1381                 .rpc_argp = &args,
1382                 .rpc_resp = &res,
1383         };
1384         nfs_fattr_init(info->fattr);
1385         return rpc_call_sync(server->client, &msg, 0);
1386 }
1387
1388 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1389                 struct nfs_fsinfo *info)
1390 {
1391         struct nfs4_exception exception = { };
1392         int err;
1393         do {
1394                 err = nfs4_handle_exception(server,
1395                                 _nfs4_lookup_root(server, fhandle, info),
1396                                 &exception);
1397         } while (exception.retry);
1398         return err;
1399 }
1400
1401 /*
1402  * get the file handle for the "/" directory on the server
1403  */
1404 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1405                               struct nfs_fsinfo *info)
1406 {
1407         int status;
1408
1409         status = nfs4_lookup_root(server, fhandle, info);
1410         if (status == 0)
1411                 status = nfs4_server_capabilities(server, fhandle);
1412         if (status == 0)
1413                 status = nfs4_do_fsinfo(server, fhandle, info);
1414         return nfs4_map_errors(status);
1415 }
1416
1417 /*
1418  * Get locations and (maybe) other attributes of a referral.
1419  * Note that we'll actually follow the referral later when
1420  * we detect fsid mismatch in inode revalidation
1421  */
1422 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1423 {
1424         int status = -ENOMEM;
1425         struct page *page = NULL;
1426         struct nfs4_fs_locations *locations = NULL;
1427         struct dentry dentry = {};
1428
1429         page = alloc_page(GFP_KERNEL);
1430         if (page == NULL)
1431                 goto out;
1432         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1433         if (locations == NULL)
1434                 goto out;
1435
1436         dentry.d_name.name = name->name;
1437         dentry.d_name.len = name->len;
1438         status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1439         if (status != 0)
1440                 goto out;
1441         /* Make sure server returned a different fsid for the referral */
1442         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1443                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1444                 status = -EIO;
1445                 goto out;
1446         }
1447
1448         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1449         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1450         if (!fattr->mode)
1451                 fattr->mode = S_IFDIR;
1452         memset(fhandle, 0, sizeof(struct nfs_fh));
1453 out:
1454         if (page)
1455                 __free_page(page);
1456         if (locations)
1457                 kfree(locations);
1458         return status;
1459 }
1460
1461 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1462 {
1463         struct nfs4_getattr_arg args = {
1464                 .fh = fhandle,
1465                 .bitmask = server->attr_bitmask,
1466         };
1467         struct nfs4_getattr_res res = {
1468                 .fattr = fattr,
1469                 .server = server,
1470         };
1471         struct rpc_message msg = {
1472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1473                 .rpc_argp = &args,
1474                 .rpc_resp = &res,
1475         };
1476
1477         nfs_fattr_init(fattr);
1478         return rpc_call_sync(server->client, &msg, 0);
1479 }
1480
1481 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1482 {
1483         struct nfs4_exception exception = { };
1484         int err;
1485         do {
1486                 err = nfs4_handle_exception(server,
1487                                 _nfs4_proc_getattr(server, fhandle, fattr),
1488                                 &exception);
1489         } while (exception.retry);
1490         return err;
1491 }
1492
1493 /*
1494  * The file is not closed if it is opened due to the a request to change
1495  * the size of the file. The open call will not be needed once the
1496  * VFS layer lookup-intents are implemented.
1497  *
1498  * Close is called when the inode is destroyed.
1499  * If we haven't opened the file for O_WRONLY, we
1500  * need to in the size_change case to obtain a stateid.
1501  *
1502  * Got race?
1503  * Because OPEN is always done by name in nfsv4, it is
1504  * possible that we opened a different file by the same
1505  * name.  We can recognize this race condition, but we
1506  * can't do anything about it besides returning an error.
1507  *
1508  * This will be fixed with VFS changes (lookup-intent).
1509  */
1510 static int
1511 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1512                   struct iattr *sattr)
1513 {
1514         struct rpc_cred *cred;
1515         struct inode *inode = dentry->d_inode;
1516         struct nfs_open_context *ctx;
1517         struct nfs4_state *state = NULL;
1518         int status;
1519
1520         nfs_fattr_init(fattr);
1521
1522         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1523         if (IS_ERR(cred))
1524                 return PTR_ERR(cred);
1525
1526         /* Search for an existing open(O_WRITE) file */
1527         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1528         if (ctx != NULL)
1529                 state = ctx->state;
1530
1531         status = nfs4_do_setattr(inode, fattr, sattr, state);
1532         if (status == 0)
1533                 nfs_setattr_update_inode(inode, sattr);
1534         if (ctx != NULL)
1535                 put_nfs_open_context(ctx);
1536         put_rpccred(cred);
1537         return status;
1538 }
1539
1540 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1541                 struct qstr *name, struct nfs_fh *fhandle,
1542                 struct nfs_fattr *fattr)
1543 {
1544         int                    status;
1545         struct nfs4_lookup_arg args = {
1546                 .bitmask = server->attr_bitmask,
1547                 .dir_fh = dirfh,
1548                 .name = name,
1549         };
1550         struct nfs4_lookup_res res = {
1551                 .server = server,
1552                 .fattr = fattr,
1553                 .fh = fhandle,
1554         };
1555         struct rpc_message msg = {
1556                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1557                 .rpc_argp = &args,
1558                 .rpc_resp = &res,
1559         };
1560
1561         nfs_fattr_init(fattr);
1562
1563         dprintk("NFS call  lookupfh %s\n", name->name);
1564         status = rpc_call_sync(server->client, &msg, 0);
1565         dprintk("NFS reply lookupfh: %d\n", status);
1566         if (status == -NFS4ERR_MOVED)
1567                 status = -EREMOTE;
1568         return status;
1569 }
1570
1571 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1572                               struct qstr *name, struct nfs_fh *fhandle,
1573                               struct nfs_fattr *fattr)
1574 {
1575         struct nfs4_exception exception = { };
1576         int err;
1577         do {
1578                 err = nfs4_handle_exception(server,
1579                                 _nfs4_proc_lookupfh(server, dirfh, name,
1580                                                     fhandle, fattr),
1581                                 &exception);
1582         } while (exception.retry);
1583         return err;
1584 }
1585
1586 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1587                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1588 {
1589         int                    status;
1590         struct nfs_server *server = NFS_SERVER(dir);
1591         struct nfs4_lookup_arg args = {
1592                 .bitmask = server->attr_bitmask,
1593                 .dir_fh = NFS_FH(dir),
1594                 .name = name,
1595         };
1596         struct nfs4_lookup_res res = {
1597                 .server = server,
1598                 .fattr = fattr,
1599                 .fh = fhandle,
1600         };
1601         struct rpc_message msg = {
1602                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1603                 .rpc_argp = &args,
1604                 .rpc_resp = &res,
1605         };
1606
1607         nfs_fattr_init(fattr);
1608
1609         dprintk("NFS call  lookup %s\n", name->name);
1610         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1611         if (status == -NFS4ERR_MOVED)
1612                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1613         dprintk("NFS reply lookup: %d\n", status);
1614         return status;
1615 }
1616
1617 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1618 {
1619         struct nfs4_exception exception = { };
1620         int err;
1621         do {
1622                 err = nfs4_handle_exception(NFS_SERVER(dir),
1623                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1624                                 &exception);
1625         } while (exception.retry);
1626         return err;
1627 }
1628
1629 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1630 {
1631         struct nfs4_accessargs args = {
1632                 .fh = NFS_FH(inode),
1633         };
1634         struct nfs4_accessres res = { 0 };
1635         struct rpc_message msg = {
1636                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1637                 .rpc_argp = &args,
1638                 .rpc_resp = &res,
1639                 .rpc_cred = entry->cred,
1640         };
1641         int mode = entry->mask;
1642         int status;
1643
1644         /*
1645          * Determine which access bits we want to ask for...
1646          */
1647         if (mode & MAY_READ)
1648                 args.access |= NFS4_ACCESS_READ;
1649         if (S_ISDIR(inode->i_mode)) {
1650                 if (mode & MAY_WRITE)
1651                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1652                 if (mode & MAY_EXEC)
1653                         args.access |= NFS4_ACCESS_LOOKUP;
1654         } else {
1655                 if (mode & MAY_WRITE)
1656                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1657                 if (mode & MAY_EXEC)
1658                         args.access |= NFS4_ACCESS_EXECUTE;
1659         }
1660         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1661         if (!status) {
1662                 entry->mask = 0;
1663                 if (res.access & NFS4_ACCESS_READ)
1664                         entry->mask |= MAY_READ;
1665                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1666                         entry->mask |= MAY_WRITE;
1667                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1668                         entry->mask |= MAY_EXEC;
1669         }
1670         return status;
1671 }
1672
1673 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1674 {
1675         struct nfs4_exception exception = { };
1676         int err;
1677         do {
1678                 err = nfs4_handle_exception(NFS_SERVER(inode),
1679                                 _nfs4_proc_access(inode, entry),
1680                                 &exception);
1681         } while (exception.retry);
1682         return err;
1683 }
1684
1685 /*
1686  * TODO: For the time being, we don't try to get any attributes
1687  * along with any of the zero-copy operations READ, READDIR,
1688  * READLINK, WRITE.
1689  *
1690  * In the case of the first three, we want to put the GETATTR
1691  * after the read-type operation -- this is because it is hard
1692  * to predict the length of a GETATTR response in v4, and thus
1693  * align the READ data correctly.  This means that the GETATTR
1694  * may end up partially falling into the page cache, and we should
1695  * shift it into the 'tail' of the xdr_buf before processing.
1696  * To do this efficiently, we need to know the total length
1697  * of data received, which doesn't seem to be available outside
1698  * of the RPC layer.
1699  *
1700  * In the case of WRITE, we also want to put the GETATTR after
1701  * the operation -- in this case because we want to make sure
1702  * we get the post-operation mtime and size.  This means that
1703  * we can't use xdr_encode_pages() as written: we need a variant
1704  * of it which would leave room in the 'tail' iovec.
1705  *
1706  * Both of these changes to the XDR layer would in fact be quite
1707  * minor, but I decided to leave them for a subsequent patch.
1708  */
1709 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1710                 unsigned int pgbase, unsigned int pglen)
1711 {
1712         struct nfs4_readlink args = {
1713                 .fh       = NFS_FH(inode),
1714                 .pgbase   = pgbase,
1715                 .pglen    = pglen,
1716                 .pages    = &page,
1717         };
1718         struct rpc_message msg = {
1719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1720                 .rpc_argp = &args,
1721                 .rpc_resp = NULL,
1722         };
1723
1724         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1725 }
1726
1727 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1728                 unsigned int pgbase, unsigned int pglen)
1729 {
1730         struct nfs4_exception exception = { };
1731         int err;
1732         do {
1733                 err = nfs4_handle_exception(NFS_SERVER(inode),
1734                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1735                                 &exception);
1736         } while (exception.retry);
1737         return err;
1738 }
1739
1740 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1741 {
1742         int flags = rdata->flags;
1743         struct inode *inode = rdata->inode;
1744         struct nfs_fattr *fattr = rdata->res.fattr;
1745         struct nfs_server *server = NFS_SERVER(inode);
1746         struct rpc_message msg = {
1747                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1748                 .rpc_argp       = &rdata->args,
1749                 .rpc_resp       = &rdata->res,
1750                 .rpc_cred       = rdata->cred,
1751         };
1752         unsigned long timestamp = jiffies;
1753         int status;
1754
1755         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1756                         (long long) rdata->args.offset);
1757
1758         nfs_fattr_init(fattr);
1759         status = rpc_call_sync(server->client, &msg, flags);
1760         if (!status)
1761                 renew_lease(server, timestamp);
1762         dprintk("NFS reply read: %d\n", status);
1763         return status;
1764 }
1765
1766 static int nfs4_proc_read(struct nfs_read_data *rdata)
1767 {
1768         struct nfs4_exception exception = { };
1769         int err;
1770         do {
1771                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1772                                 _nfs4_proc_read(rdata),
1773                                 &exception);
1774         } while (exception.retry);
1775         return err;
1776 }
1777
1778 /*
1779  * Got race?
1780  * We will need to arrange for the VFS layer to provide an atomic open.
1781  * Until then, this create/open method is prone to inefficiency and race
1782  * conditions due to the lookup, create, and open VFS calls from sys_open()
1783  * placed on the wire.
1784  *
1785  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1786  * The file will be opened again in the subsequent VFS open call
1787  * (nfs4_proc_file_open).
1788  *
1789  * The open for read will just hang around to be used by any process that
1790  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1791  */
1792
1793 static int
1794 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1795                  int flags, struct nameidata *nd)
1796 {
1797         struct nfs4_state *state;
1798         struct rpc_cred *cred;
1799         int status = 0;
1800
1801         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1802         if (IS_ERR(cred)) {
1803                 status = PTR_ERR(cred);
1804                 goto out;
1805         }
1806         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1807         put_rpccred(cred);
1808         if (IS_ERR(state)) {
1809                 status = PTR_ERR(state);
1810                 goto out;
1811         }
1812         d_instantiate(dentry, igrab(state->inode));
1813         if (flags & O_EXCL) {
1814                 struct nfs_fattr fattr;
1815                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1816                 if (status == 0)
1817                         nfs_setattr_update_inode(state->inode, sattr);
1818         }
1819         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1820                 status = nfs4_intent_set_file(nd, dentry, state);
1821         else
1822                 nfs4_close_state(state, flags);
1823 out:
1824         return status;
1825 }
1826
1827 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1828 {
1829         struct nfs_server *server = NFS_SERVER(dir);
1830         struct nfs4_remove_arg args = {
1831                 .fh = NFS_FH(dir),
1832                 .name = name,
1833                 .bitmask = server->attr_bitmask,
1834         };
1835         struct nfs_fattr dir_attr;
1836         struct nfs4_remove_res  res = {
1837                 .server = server,
1838                 .dir_attr = &dir_attr,
1839         };
1840         struct rpc_message msg = {
1841                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1842                 .rpc_argp       = &args,
1843                 .rpc_resp       = &res,
1844         };
1845         int                     status;
1846
1847         nfs_fattr_init(res.dir_attr);
1848         status = rpc_call_sync(server->client, &msg, 0);
1849         if (status == 0) {
1850                 update_changeattr(dir, &res.cinfo);
1851                 nfs_post_op_update_inode(dir, res.dir_attr);
1852         }
1853         return status;
1854 }
1855
1856 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1857 {
1858         struct nfs4_exception exception = { };
1859         int err;
1860         do {
1861                 err = nfs4_handle_exception(NFS_SERVER(dir),
1862                                 _nfs4_proc_remove(dir, name),
1863                                 &exception);
1864         } while (exception.retry);
1865         return err;
1866 }
1867
1868 struct unlink_desc {
1869         struct nfs4_remove_arg  args;
1870         struct nfs4_remove_res  res;
1871         struct nfs_fattr dir_attr;
1872 };
1873
1874 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1875                 struct qstr *name)
1876 {
1877         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1878         struct unlink_desc *up;
1879
1880         up = kmalloc(sizeof(*up), GFP_KERNEL);
1881         if (!up)
1882                 return -ENOMEM;
1883
1884         up->args.fh = NFS_FH(dir->d_inode);
1885         up->args.name = name;
1886         up->args.bitmask = server->attr_bitmask;
1887         up->res.server = server;
1888         up->res.dir_attr = &up->dir_attr;
1889
1890         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1891         msg->rpc_argp = &up->args;
1892         msg->rpc_resp = &up->res;
1893         return 0;
1894 }
1895
1896 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1897 {
1898         struct rpc_message *msg = &task->tk_msg;
1899         struct unlink_desc *up;
1900
1901         if (msg->rpc_resp != NULL) {
1902                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1903                 update_changeattr(dir->d_inode, &up->res.cinfo);
1904                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1905                 kfree(up);
1906                 msg->rpc_resp = NULL;
1907                 msg->rpc_argp = NULL;
1908         }
1909         return 0;
1910 }
1911
1912 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1913                 struct inode *new_dir, struct qstr *new_name)
1914 {
1915         struct nfs_server *server = NFS_SERVER(old_dir);
1916         struct nfs4_rename_arg arg = {
1917                 .old_dir = NFS_FH(old_dir),
1918                 .new_dir = NFS_FH(new_dir),
1919                 .old_name = old_name,
1920                 .new_name = new_name,
1921                 .bitmask = server->attr_bitmask,
1922         };
1923         struct nfs_fattr old_fattr, new_fattr;
1924         struct nfs4_rename_res res = {
1925                 .server = server,
1926                 .old_fattr = &old_fattr,
1927                 .new_fattr = &new_fattr,
1928         };
1929         struct rpc_message msg = {
1930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1931                 .rpc_argp = &arg,
1932                 .rpc_resp = &res,
1933         };
1934         int                     status;
1935
1936         nfs_fattr_init(res.old_fattr);
1937         nfs_fattr_init(res.new_fattr);
1938         status = rpc_call_sync(server->client, &msg, 0);
1939
1940         if (!status) {
1941                 update_changeattr(old_dir, &res.old_cinfo);
1942                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1943                 update_changeattr(new_dir, &res.new_cinfo);
1944                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1945         }
1946         return status;
1947 }
1948
1949 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1950                 struct inode *new_dir, struct qstr *new_name)
1951 {
1952         struct nfs4_exception exception = { };
1953         int err;
1954         do {
1955                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1956                                 _nfs4_proc_rename(old_dir, old_name,
1957                                         new_dir, new_name),
1958                                 &exception);
1959         } while (exception.retry);
1960         return err;
1961 }
1962
1963 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1964 {
1965         struct nfs_server *server = NFS_SERVER(inode);
1966         struct nfs4_link_arg arg = {
1967                 .fh     = NFS_FH(inode),
1968                 .dir_fh = NFS_FH(dir),
1969                 .name   = name,
1970                 .bitmask = server->attr_bitmask,
1971         };
1972         struct nfs_fattr fattr, dir_attr;
1973         struct nfs4_link_res res = {
1974                 .server = server,
1975                 .fattr = &fattr,
1976                 .dir_attr = &dir_attr,
1977         };
1978         struct rpc_message msg = {
1979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1980                 .rpc_argp = &arg,
1981                 .rpc_resp = &res,
1982         };
1983         int                     status;
1984
1985         nfs_fattr_init(res.fattr);
1986         nfs_fattr_init(res.dir_attr);
1987         status = rpc_call_sync(server->client, &msg, 0);
1988         if (!status) {
1989                 update_changeattr(dir, &res.cinfo);
1990                 nfs_post_op_update_inode(dir, res.dir_attr);
1991                 nfs_post_op_update_inode(inode, res.fattr);
1992         }
1993
1994         return status;
1995 }
1996
1997 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1998 {
1999         struct nfs4_exception exception = { };
2000         int err;
2001         do {
2002                 err = nfs4_handle_exception(NFS_SERVER(inode),
2003                                 _nfs4_proc_link(inode, dir, name),
2004                                 &exception);
2005         } while (exception.retry);
2006         return err;
2007 }
2008
2009 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2010                 struct page *page, unsigned int len, struct iattr *sattr)
2011 {
2012         struct nfs_server *server = NFS_SERVER(dir);
2013         struct nfs_fh fhandle;
2014         struct nfs_fattr fattr, dir_fattr;
2015         struct nfs4_create_arg arg = {
2016                 .dir_fh = NFS_FH(dir),
2017                 .server = server,
2018                 .name = &dentry->d_name,
2019                 .attrs = sattr,
2020                 .ftype = NF4LNK,
2021                 .bitmask = server->attr_bitmask,
2022         };
2023         struct nfs4_create_res res = {
2024                 .server = server,
2025                 .fh = &fhandle,
2026                 .fattr = &fattr,
2027                 .dir_fattr = &dir_fattr,
2028         };
2029         struct rpc_message msg = {
2030                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2031                 .rpc_argp = &arg,
2032                 .rpc_resp = &res,
2033         };
2034         int                     status;
2035
2036         if (len > NFS4_MAXPATHLEN)
2037                 return -ENAMETOOLONG;
2038
2039         arg.u.symlink.pages = &page;
2040         arg.u.symlink.len = len;
2041         nfs_fattr_init(&fattr);
2042         nfs_fattr_init(&dir_fattr);
2043
2044         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2045         if (!status) {
2046                 update_changeattr(dir, &res.dir_cinfo);
2047                 nfs_post_op_update_inode(dir, res.dir_fattr);
2048                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2049         }
2050         return status;
2051 }
2052
2053 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2054                 struct page *page, unsigned int len, struct iattr *sattr)
2055 {
2056         struct nfs4_exception exception = { };
2057         int err;
2058         do {
2059                 err = nfs4_handle_exception(NFS_SERVER(dir),
2060                                 _nfs4_proc_symlink(dir, dentry, page,
2061                                                         len, sattr),
2062                                 &exception);
2063         } while (exception.retry);
2064         return err;
2065 }
2066
2067 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2068                 struct iattr *sattr)
2069 {
2070         struct nfs_server *server = NFS_SERVER(dir);
2071         struct nfs_fh fhandle;
2072         struct nfs_fattr fattr, dir_fattr;
2073         struct nfs4_create_arg arg = {
2074                 .dir_fh = NFS_FH(dir),
2075                 .server = server,
2076                 .name = &dentry->d_name,
2077                 .attrs = sattr,
2078                 .ftype = NF4DIR,
2079                 .bitmask = server->attr_bitmask,
2080         };
2081         struct nfs4_create_res res = {
2082                 .server = server,
2083                 .fh = &fhandle,
2084                 .fattr = &fattr,
2085                 .dir_fattr = &dir_fattr,
2086         };
2087         struct rpc_message msg = {
2088                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2089                 .rpc_argp = &arg,
2090                 .rpc_resp = &res,
2091         };
2092         int                     status;
2093
2094         nfs_fattr_init(&fattr);
2095         nfs_fattr_init(&dir_fattr);
2096
2097         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2098         if (!status) {
2099                 update_changeattr(dir, &res.dir_cinfo);
2100                 nfs_post_op_update_inode(dir, res.dir_fattr);
2101                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2102         }
2103         return status;
2104 }
2105
2106 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2107                 struct iattr *sattr)
2108 {
2109         struct nfs4_exception exception = { };
2110         int err;
2111         do {
2112                 err = nfs4_handle_exception(NFS_SERVER(dir),
2113                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2114                                 &exception);
2115         } while (exception.retry);
2116         return err;
2117 }
2118
2119 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2120                   u64 cookie, struct page *page, unsigned int count, int plus)
2121 {
2122         struct inode            *dir = dentry->d_inode;
2123         struct nfs4_readdir_arg args = {
2124                 .fh = NFS_FH(dir),
2125                 .pages = &page,
2126                 .pgbase = 0,
2127                 .count = count,
2128                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2129         };
2130         struct nfs4_readdir_res res;
2131         struct rpc_message msg = {
2132                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2133                 .rpc_argp = &args,
2134                 .rpc_resp = &res,
2135                 .rpc_cred = cred,
2136         };
2137         int                     status;
2138
2139         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2140                         dentry->d_parent->d_name.name,
2141                         dentry->d_name.name,
2142                         (unsigned long long)cookie);
2143         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2144         res.pgbase = args.pgbase;
2145         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2146         if (status == 0)
2147                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2148         dprintk("%s: returns %d\n", __FUNCTION__, status);
2149         return status;
2150 }
2151
2152 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2153                   u64 cookie, struct page *page, unsigned int count, int plus)
2154 {
2155         struct nfs4_exception exception = { };
2156         int err;
2157         do {
2158                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2159                                 _nfs4_proc_readdir(dentry, cred, cookie,
2160                                         page, count, plus),
2161                                 &exception);
2162         } while (exception.retry);
2163         return err;
2164 }
2165
2166 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2167                 struct iattr *sattr, dev_t rdev)
2168 {
2169         struct nfs_server *server = NFS_SERVER(dir);
2170         struct nfs_fh fh;
2171         struct nfs_fattr fattr, dir_fattr;
2172         struct nfs4_create_arg arg = {
2173                 .dir_fh = NFS_FH(dir),
2174                 .server = server,
2175                 .name = &dentry->d_name,
2176                 .attrs = sattr,
2177                 .bitmask = server->attr_bitmask,
2178         };
2179         struct nfs4_create_res res = {
2180                 .server = server,
2181                 .fh = &fh,
2182                 .fattr = &fattr,
2183                 .dir_fattr = &dir_fattr,
2184         };
2185         struct rpc_message msg = {
2186                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2187                 .rpc_argp = &arg,
2188                 .rpc_resp = &res,
2189         };
2190         int                     status;
2191         int                     mode = sattr->ia_mode;
2192
2193         nfs_fattr_init(&fattr);
2194         nfs_fattr_init(&dir_fattr);
2195
2196         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2197         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2198         if (S_ISFIFO(mode))
2199                 arg.ftype = NF4FIFO;
2200         else if (S_ISBLK(mode)) {
2201                 arg.ftype = NF4BLK;
2202                 arg.u.device.specdata1 = MAJOR(rdev);
2203                 arg.u.device.specdata2 = MINOR(rdev);
2204         }
2205         else if (S_ISCHR(mode)) {
2206                 arg.ftype = NF4CHR;
2207                 arg.u.device.specdata1 = MAJOR(rdev);
2208                 arg.u.device.specdata2 = MINOR(rdev);
2209         }
2210         else
2211                 arg.ftype = NF4SOCK;
2212
2213         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2214         if (status == 0) {
2215                 update_changeattr(dir, &res.dir_cinfo);
2216                 nfs_post_op_update_inode(dir, res.dir_fattr);
2217                 status = nfs_instantiate(dentry, &fh, &fattr);
2218         }
2219         return status;
2220 }
2221
2222 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2223                 struct iattr *sattr, dev_t rdev)
2224 {
2225         struct nfs4_exception exception = { };
2226         int err;
2227         do {
2228                 err = nfs4_handle_exception(NFS_SERVER(dir),
2229                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2230                                 &exception);
2231         } while (exception.retry);
2232         return err;
2233 }
2234
2235 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2236                  struct nfs_fsstat *fsstat)
2237 {
2238         struct nfs4_statfs_arg args = {
2239                 .fh = fhandle,
2240                 .bitmask = server->attr_bitmask,
2241         };
2242         struct rpc_message msg = {
2243                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2244                 .rpc_argp = &args,
2245                 .rpc_resp = fsstat,
2246         };
2247
2248         nfs_fattr_init(fsstat->fattr);
2249         return rpc_call_sync(server->client, &msg, 0);
2250 }
2251
2252 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2253 {
2254         struct nfs4_exception exception = { };
2255         int err;
2256         do {
2257                 err = nfs4_handle_exception(server,
2258                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2259                                 &exception);
2260         } while (exception.retry);
2261         return err;
2262 }
2263
2264 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2265                 struct nfs_fsinfo *fsinfo)
2266 {
2267         struct nfs4_fsinfo_arg args = {
2268                 .fh = fhandle,
2269                 .bitmask = server->attr_bitmask,
2270         };
2271         struct rpc_message msg = {
2272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2273                 .rpc_argp = &args,
2274                 .rpc_resp = fsinfo,
2275         };
2276
2277         return rpc_call_sync(server->client, &msg, 0);
2278 }
2279
2280 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2281 {
2282         struct nfs4_exception exception = { };
2283         int err;
2284
2285         do {
2286                 err = nfs4_handle_exception(server,
2287                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2288                                 &exception);
2289         } while (exception.retry);
2290         return err;
2291 }
2292
2293 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2294 {
2295         nfs_fattr_init(fsinfo->fattr);
2296         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2297 }
2298
2299 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2300                 struct nfs_pathconf *pathconf)
2301 {
2302         struct nfs4_pathconf_arg args = {
2303                 .fh = fhandle,
2304                 .bitmask = server->attr_bitmask,
2305         };
2306         struct rpc_message msg = {
2307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2308                 .rpc_argp = &args,
2309                 .rpc_resp = pathconf,
2310         };
2311
2312         /* None of the pathconf attributes are mandatory to implement */
2313         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2314                 memset(pathconf, 0, sizeof(*pathconf));
2315                 return 0;
2316         }
2317
2318         nfs_fattr_init(pathconf->fattr);
2319         return rpc_call_sync(server->client, &msg, 0);
2320 }
2321
2322 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2323                 struct nfs_pathconf *pathconf)
2324 {
2325         struct nfs4_exception exception = { };
2326         int err;
2327
2328         do {
2329                 err = nfs4_handle_exception(server,
2330                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2331                                 &exception);
2332         } while (exception.retry);
2333         return err;
2334 }
2335
2336 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2337 {
2338         struct nfs_server *server = NFS_SERVER(data->inode);
2339
2340         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2341                 rpc_restart_call(task);
2342                 return -EAGAIN;
2343         }
2344         if (task->tk_status > 0)
2345                 renew_lease(server, data->timestamp);
2346         return 0;
2347 }
2348
2349 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2350 {
2351         struct rpc_message msg = {
2352                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2353                 .rpc_argp = &data->args,
2354                 .rpc_resp = &data->res,
2355                 .rpc_cred = data->cred,
2356         };
2357
2358         data->timestamp   = jiffies;
2359
2360         rpc_call_setup(&data->task, &msg, 0);
2361 }
2362
2363 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2364 {
2365         struct inode *inode = data->inode;
2366
2367         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2368                 rpc_restart_call(task);
2369                 return -EAGAIN;
2370         }
2371         if (task->tk_status >= 0) {
2372                 renew_lease(NFS_SERVER(inode), data->timestamp);
2373                 nfs_post_op_update_inode(inode, data->res.fattr);
2374         }
2375         return 0;
2376 }
2377
2378 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2379 {
2380         struct rpc_message msg = {
2381                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2382                 .rpc_argp = &data->args,
2383                 .rpc_resp = &data->res,
2384                 .rpc_cred = data->cred,
2385         };
2386         struct inode *inode = data->inode;
2387         struct nfs_server *server = NFS_SERVER(inode);
2388         int stable;
2389
2390         if (how & FLUSH_STABLE) {
2391                 if (!NFS_I(inode)->ncommit)
2392                         stable = NFS_FILE_SYNC;
2393                 else
2394                         stable = NFS_DATA_SYNC;
2395         } else
2396                 stable = NFS_UNSTABLE;
2397         data->args.stable = stable;
2398         data->args.bitmask = server->attr_bitmask;
2399         data->res.server = server;
2400
2401         data->timestamp   = jiffies;
2402
2403         /* Finalize the task. */
2404         rpc_call_setup(&data->task, &msg, 0);
2405 }
2406
2407 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2408 {
2409         struct inode *inode = data->inode;
2410
2411         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2412                 rpc_restart_call(task);
2413                 return -EAGAIN;
2414         }
2415         if (task->tk_status >= 0)
2416                 nfs_post_op_update_inode(inode, data->res.fattr);
2417         return 0;
2418 }
2419
2420 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2421 {
2422         struct rpc_message msg = {
2423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2424                 .rpc_argp = &data->args,
2425                 .rpc_resp = &data->res,
2426                 .rpc_cred = data->cred,
2427         };
2428         struct nfs_server *server = NFS_SERVER(data->inode);
2429
2430         data->args.bitmask = server->attr_bitmask;
2431         data->res.server = server;
2432
2433         rpc_call_setup(&data->task, &msg, 0);
2434 }
2435
2436 /*
2437  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2438  * standalone procedure for queueing an asynchronous RENEW.
2439  */
2440 static void nfs4_renew_done(struct rpc_task *task, void *data)
2441 {
2442         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2443         unsigned long timestamp = (unsigned long)data;
2444
2445         if (task->tk_status < 0) {
2446                 switch (task->tk_status) {
2447                         case -NFS4ERR_STALE_CLIENTID:
2448                         case -NFS4ERR_EXPIRED:
2449                         case -NFS4ERR_CB_PATH_DOWN:
2450                                 nfs4_schedule_state_recovery(clp);
2451                 }
2452                 return;
2453         }
2454         spin_lock(&clp->cl_lock);
2455         if (time_before(clp->cl_last_renewal,timestamp))
2456                 clp->cl_last_renewal = timestamp;
2457         spin_unlock(&clp->cl_lock);
2458 }
2459
2460 static const struct rpc_call_ops nfs4_renew_ops = {
2461         .rpc_call_done = nfs4_renew_done,
2462 };
2463
2464 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2465 {
2466         struct rpc_message msg = {
2467                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2468                 .rpc_argp       = clp,
2469                 .rpc_cred       = cred,
2470         };
2471
2472         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2473                         &nfs4_renew_ops, (void *)jiffies);
2474 }
2475
2476 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2477 {
2478         struct rpc_message msg = {
2479                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2480                 .rpc_argp       = clp,
2481                 .rpc_cred       = cred,
2482         };
2483         unsigned long now = jiffies;
2484         int status;
2485
2486         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2487         if (status < 0)
2488                 return status;
2489         spin_lock(&clp->cl_lock);
2490         if (time_before(clp->cl_last_renewal,now))
2491                 clp->cl_last_renewal = now;
2492         spin_unlock(&clp->cl_lock);
2493         return 0;
2494 }
2495
2496 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2497 {
2498         return (server->caps & NFS_CAP_ACLS)
2499                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2500                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2501 }
2502
2503 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2504  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2505  * the stack.
2506  */
2507 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2508
2509 static void buf_to_pages(const void *buf, size_t buflen,
2510                 struct page **pages, unsigned int *pgbase)
2511 {
2512         const void *p = buf;
2513
2514         *pgbase = offset_in_page(buf);
2515         p -= *pgbase;
2516         while (p < buf + buflen) {
2517                 *(pages++) = virt_to_page(p);
2518                 p += PAGE_CACHE_SIZE;
2519         }
2520 }
2521
2522 struct nfs4_cached_acl {
2523         int cached;
2524         size_t len;
2525         char data[0];
2526 };
2527
2528 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2529 {
2530         struct nfs_inode *nfsi = NFS_I(inode);
2531
2532         spin_lock(&inode->i_lock);
2533         kfree(nfsi->nfs4_acl);
2534         nfsi->nfs4_acl = acl;
2535         spin_unlock(&inode->i_lock);
2536 }
2537
2538 static void nfs4_zap_acl_attr(struct inode *inode)
2539 {
2540         nfs4_set_cached_acl(inode, NULL);
2541 }
2542
2543 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2544 {
2545         struct nfs_inode *nfsi = NFS_I(inode);
2546         struct nfs4_cached_acl *acl;
2547         int ret = -ENOENT;
2548
2549         spin_lock(&inode->i_lock);
2550         acl = nfsi->nfs4_acl;
2551         if (acl == NULL)
2552                 goto out;
2553         if (buf == NULL) /* user is just asking for length */
2554                 goto out_len;
2555         if (acl->cached == 0)
2556                 goto out;
2557         ret = -ERANGE; /* see getxattr(2) man page */
2558         if (acl->len > buflen)
2559                 goto out;
2560         memcpy(buf, acl->data, acl->len);
2561 out_len:
2562         ret = acl->len;
2563 out:
2564         spin_unlock(&inode->i_lock);
2565         return ret;
2566 }
2567
2568 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2569 {
2570         struct nfs4_cached_acl *acl;
2571
2572         if (buf && acl_len <= PAGE_SIZE) {
2573                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2574                 if (acl == NULL)
2575                         goto out;
2576                 acl->cached = 1;
2577                 memcpy(acl->data, buf, acl_len);
2578         } else {
2579                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2580                 if (acl == NULL)
2581                         goto out;
2582                 acl->cached = 0;
2583         }
2584         acl->len = acl_len;
2585 out:
2586         nfs4_set_cached_acl(inode, acl);
2587 }
2588
2589 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2590 {
2591         struct page *pages[NFS4ACL_MAXPAGES];
2592         struct nfs_getaclargs args = {
2593                 .fh = NFS_FH(inode),
2594                 .acl_pages = pages,
2595                 .acl_len = buflen,
2596         };
2597         size_t resp_len = buflen;
2598         void *resp_buf;
2599         struct rpc_message msg = {
2600                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2601                 .rpc_argp = &args,
2602                 .rpc_resp = &resp_len,
2603         };
2604         struct page *localpage = NULL;
2605         int ret;
2606
2607         if (buflen < PAGE_SIZE) {
2608                 /* As long as we're doing a round trip to the server anyway,
2609                  * let's be prepared for a page of acl data. */
2610                 localpage = alloc_page(GFP_KERNEL);
2611                 resp_buf = page_address(localpage);
2612                 if (localpage == NULL)
2613                         return -ENOMEM;
2614                 args.acl_pages[0] = localpage;
2615                 args.acl_pgbase = 0;
2616                 resp_len = args.acl_len = PAGE_SIZE;
2617         } else {
2618                 resp_buf = buf;
2619                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2620         }
2621         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2622         if (ret)
2623                 goto out_free;
2624         if (resp_len > args.acl_len)
2625                 nfs4_write_cached_acl(inode, NULL, resp_len);
2626         else
2627                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2628         if (buf) {
2629                 ret = -ERANGE;
2630                 if (resp_len > buflen)
2631                         goto out_free;
2632                 if (localpage)
2633                         memcpy(buf, resp_buf, resp_len);
2634         }
2635         ret = resp_len;
2636 out_free:
2637         if (localpage)
2638                 __free_page(localpage);
2639         return ret;
2640 }
2641
2642 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2643 {
2644         struct nfs4_exception exception = { };
2645         ssize_t ret;
2646         do {
2647                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2648                 if (ret >= 0)
2649                         break;
2650                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2651         } while (exception.retry);
2652         return ret;
2653 }
2654
2655 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2656 {
2657         struct nfs_server *server = NFS_SERVER(inode);
2658         int ret;
2659
2660         if (!nfs4_server_supports_acls(server))
2661                 return -EOPNOTSUPP;
2662         ret = nfs_revalidate_inode(server, inode);
2663         if (ret < 0)
2664                 return ret;
2665         ret = nfs4_read_cached_acl(inode, buf, buflen);
2666         if (ret != -ENOENT)
2667                 return ret;
2668         return nfs4_get_acl_uncached(inode, buf, buflen);
2669 }
2670
2671 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2672 {
2673         struct nfs_server *server = NFS_SERVER(inode);
2674         struct page *pages[NFS4ACL_MAXPAGES];
2675         struct nfs_setaclargs arg = {
2676                 .fh             = NFS_FH(inode),
2677                 .acl_pages      = pages,
2678                 .acl_len        = buflen,
2679         };
2680         struct rpc_message msg = {
2681                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2682                 .rpc_argp       = &arg,
2683                 .rpc_resp       = NULL,
2684         };
2685         int ret;
2686
2687         if (!nfs4_server_supports_acls(server))
2688                 return -EOPNOTSUPP;
2689         nfs_inode_return_delegation(inode);
2690         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2691         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2692         if (ret == 0)
2693                 nfs4_write_cached_acl(inode, buf, buflen);
2694         return ret;
2695 }
2696
2697 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2698 {
2699         struct nfs4_exception exception = { };
2700         int err;
2701         do {
2702                 err = nfs4_handle_exception(NFS_SERVER(inode),
2703                                 __nfs4_proc_set_acl(inode, buf, buflen),
2704                                 &exception);
2705         } while (exception.retry);
2706         return err;
2707 }
2708
2709 static int
2710 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2711 {
2712         struct nfs_client *clp = server->nfs_client;
2713
2714         if (!clp || task->tk_status >= 0)
2715                 return 0;
2716         switch(task->tk_status) {
2717                 case -NFS4ERR_STALE_CLIENTID:
2718                 case -NFS4ERR_STALE_STATEID:
2719                 case -NFS4ERR_EXPIRED:
2720                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2721                         nfs4_schedule_state_recovery(clp);
2722                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2723                                 rpc_wake_up_task(task);
2724                         task->tk_status = 0;
2725                         return -EAGAIN;
2726                 case -NFS4ERR_DELAY:
2727                         nfs_inc_server_stats((struct nfs_server *) server,
2728                                                 NFSIOS_DELAY);
2729                 case -NFS4ERR_GRACE:
2730                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2731                         task->tk_status = 0;
2732                         return -EAGAIN;
2733                 case -NFS4ERR_OLD_STATEID:
2734                         task->tk_status = 0;
2735                         return -EAGAIN;
2736         }
2737         task->tk_status = nfs4_map_errors(task->tk_status);
2738         return 0;
2739 }
2740
2741 static int nfs4_wait_bit_interruptible(void *word)
2742 {
2743         if (signal_pending(current))
2744                 return -ERESTARTSYS;
2745         schedule();
2746         return 0;
2747 }
2748
2749 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2750 {
2751         sigset_t oldset;
2752         int res;
2753
2754         might_sleep();
2755
2756         rpc_clnt_sigmask(clnt, &oldset);
2757         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2758                         nfs4_wait_bit_interruptible,
2759                         TASK_INTERRUPTIBLE);
2760         rpc_clnt_sigunmask(clnt, &oldset);
2761         return res;
2762 }
2763
2764 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2765 {
2766         sigset_t oldset;
2767         int res = 0;
2768
2769         might_sleep();
2770
2771         if (*timeout <= 0)
2772                 *timeout = NFS4_POLL_RETRY_MIN;
2773         if (*timeout > NFS4_POLL_RETRY_MAX)
2774                 *timeout = NFS4_POLL_RETRY_MAX;
2775         rpc_clnt_sigmask(clnt, &oldset);
2776         if (clnt->cl_intr) {
2777                 schedule_timeout_interruptible(*timeout);
2778                 if (signalled())
2779                         res = -ERESTARTSYS;
2780         } else
2781                 schedule_timeout_uninterruptible(*timeout);
2782         rpc_clnt_sigunmask(clnt, &oldset);
2783         *timeout <<= 1;
2784         return res;
2785 }
2786
2787 /* This is the error handling routine for processes that are allowed
2788  * to sleep.
2789  */
2790 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2791 {
2792         struct nfs_client *clp = server->nfs_client;
2793         int ret = errorcode;
2794
2795         exception->retry = 0;
2796         switch(errorcode) {
2797                 case 0:
2798                         return 0;
2799                 case -NFS4ERR_STALE_CLIENTID:
2800                 case -NFS4ERR_STALE_STATEID:
2801                 case -NFS4ERR_EXPIRED:
2802                         nfs4_schedule_state_recovery(clp);
2803                         ret = nfs4_wait_clnt_recover(server->client, clp);
2804                         if (ret == 0)
2805                                 exception->retry = 1;
2806                         break;
2807                 case -NFS4ERR_FILE_OPEN:
2808                 case -NFS4ERR_GRACE:
2809                 case -NFS4ERR_DELAY:
2810                         ret = nfs4_delay(server->client, &exception->timeout);
2811                         if (ret != 0)
2812                                 break;
2813                 case -NFS4ERR_OLD_STATEID:
2814                         exception->retry = 1;
2815         }
2816         /* We failed to handle the error */
2817         return nfs4_map_errors(ret);
2818 }
2819
2820 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2821 {
2822         nfs4_verifier sc_verifier;
2823         struct nfs4_setclientid setclientid = {
2824                 .sc_verifier = &sc_verifier,
2825                 .sc_prog = program,
2826         };
2827         struct rpc_message msg = {
2828                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2829                 .rpc_argp = &setclientid,
2830                 .rpc_resp = clp,
2831                 .rpc_cred = cred,
2832         };
2833         __be32 *p;
2834         int loop = 0;
2835         int status;
2836
2837         p = (__be32*)sc_verifier.data;
2838         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2839         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2840
2841         for(;;) {
2842                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2843                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2844                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2845                                 cred->cr_ops->cr_name,
2846                                 clp->cl_id_uniquifier);
2847                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2848                                 sizeof(setclientid.sc_netid), "tcp");
2849                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2850                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2851                                 clp->cl_ipaddr, port >> 8, port & 255);
2852
2853                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2854                 if (status != -NFS4ERR_CLID_INUSE)
2855                         break;
2856                 if (signalled())
2857                         break;
2858                 if (loop++ & 1)
2859                         ssleep(clp->cl_lease_time + 1);
2860                 else
2861                         if (++clp->cl_id_uniquifier == 0)
2862                                 break;
2863         }
2864         return status;
2865 }
2866
2867 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2868 {
2869         struct nfs_fsinfo fsinfo;
2870         struct rpc_message msg = {
2871                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2872                 .rpc_argp = clp,
2873                 .rpc_resp = &fsinfo,
2874                 .rpc_cred = cred,
2875         };
2876         unsigned long now;
2877         int status;
2878
2879         now = jiffies;
2880         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2881         if (status == 0) {
2882                 spin_lock(&clp->cl_lock);
2883                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2884                 clp->cl_last_renewal = now;
2885                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2886                 spin_unlock(&clp->cl_lock);
2887         }
2888         return status;
2889 }
2890
2891 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2892 {
2893         long timeout;
2894         int err;
2895         do {
2896                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2897                 switch (err) {
2898                         case 0:
2899                                 return err;
2900                         case -NFS4ERR_RESOURCE:
2901                                 /* The IBM lawyers misread another document! */
2902                         case -NFS4ERR_DELAY:
2903                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2904                 }
2905         } while (err == 0);
2906         return err;
2907 }
2908
2909 struct nfs4_delegreturndata {
2910         struct nfs4_delegreturnargs args;
2911         struct nfs4_delegreturnres res;
2912         struct nfs_fh fh;
2913         nfs4_stateid stateid;
2914         struct rpc_cred *cred;
2915         unsigned long timestamp;
2916         struct nfs_fattr fattr;
2917         int rpc_status;
2918 };
2919
2920 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2921 {
2922         struct nfs4_delegreturndata *data = calldata;
2923         struct rpc_message msg = {
2924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2925                 .rpc_argp = &data->args,
2926                 .rpc_resp = &data->res,
2927                 .rpc_cred = data->cred,
2928         };
2929         nfs_fattr_init(data->res.fattr);
2930         rpc_call_setup(task, &msg, 0);
2931 }
2932
2933 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2934 {
2935         struct nfs4_delegreturndata *data = calldata;
2936         data->rpc_status = task->tk_status;
2937         if (data->rpc_status == 0)
2938                 renew_lease(data->res.server, data->timestamp);
2939 }
2940
2941 static void nfs4_delegreturn_release(void *calldata)
2942 {
2943         struct nfs4_delegreturndata *data = calldata;
2944
2945         put_rpccred(data->cred);
2946         kfree(calldata);
2947 }
2948
2949 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2950         .rpc_call_prepare = nfs4_delegreturn_prepare,
2951         .rpc_call_done = nfs4_delegreturn_done,
2952         .rpc_release = nfs4_delegreturn_release,
2953 };
2954
2955 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2956 {
2957         struct nfs4_delegreturndata *data;
2958         struct nfs_server *server = NFS_SERVER(inode);
2959         struct rpc_task *task;
2960         int status;
2961
2962         data = kmalloc(sizeof(*data), GFP_KERNEL);
2963         if (data == NULL)
2964                 return -ENOMEM;
2965         data->args.fhandle = &data->fh;
2966         data->args.stateid = &data->stateid;
2967         data->args.bitmask = server->attr_bitmask;
2968         nfs_copy_fh(&data->fh, NFS_FH(inode));
2969         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2970         data->res.fattr = &data->fattr;
2971         data->res.server = server;
2972         data->cred = get_rpccred(cred);
2973         data->timestamp = jiffies;
2974         data->rpc_status = 0;
2975
2976         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2977         if (IS_ERR(task))
2978                 return PTR_ERR(task);
2979         status = nfs4_wait_for_completion_rpc_task(task);
2980         if (status == 0) {
2981                 status = data->rpc_status;
2982                 if (status == 0)
2983                         nfs_post_op_update_inode(inode, &data->fattr);
2984         }
2985         rpc_put_task(task);
2986         return status;
2987 }
2988
2989 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2990 {
2991         struct nfs_server *server = NFS_SERVER(inode);
2992         struct nfs4_exception exception = { };
2993         int err;
2994         do {
2995                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2996                 switch (err) {
2997                         case -NFS4ERR_STALE_STATEID:
2998                         case -NFS4ERR_EXPIRED:
2999                                 nfs4_schedule_state_recovery(server->nfs_client);
3000                         case 0:
3001                                 return 0;
3002                 }
3003                 err = nfs4_handle_exception(server, err, &exception);
3004         } while (exception.retry);
3005         return err;
3006 }
3007
3008 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3009 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3010
3011 /*
3012  * sleep, with exponential backoff, and retry the LOCK operation.
3013  */
3014 static unsigned long
3015 nfs4_set_lock_task_retry(unsigned long timeout)
3016 {
3017         schedule_timeout_interruptible(timeout);
3018         timeout <<= 1;
3019         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3020                 return NFS4_LOCK_MAXTIMEOUT;
3021         return timeout;
3022 }
3023
3024 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3025 {
3026         struct inode *inode = state->inode;
3027         struct nfs_server *server = NFS_SERVER(inode);
3028         struct nfs_client *clp = server->nfs_client;
3029         struct nfs_lockt_args arg = {
3030                 .fh = NFS_FH(inode),
3031                 .fl = request,
3032         };
3033         struct nfs_lockt_res res = {
3034                 .denied = request,
3035         };
3036         struct rpc_message msg = {
3037                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3038                 .rpc_argp       = &arg,
3039                 .rpc_resp       = &res,
3040                 .rpc_cred       = state->owner->so_cred,
3041         };
3042         struct nfs4_lock_state *lsp;
3043         int status;
3044
3045         down_read(&clp->cl_sem);
3046         arg.lock_owner.clientid = clp->cl_clientid;
3047         status = nfs4_set_lock_state(state, request);
3048         if (status != 0)
3049                 goto out;
3050         lsp = request->fl_u.nfs4_fl.owner;
3051         arg.lock_owner.id = lsp->ls_id;
3052         status = rpc_call_sync(server->client, &msg, 0);
3053         switch (status) {
3054                 case 0:
3055                         request->fl_type = F_UNLCK;
3056                         break;
3057                 case -NFS4ERR_DENIED:
3058                         status = 0;
3059         }
3060 out:
3061         up_read(&clp->cl_sem);
3062         return status;
3063 }
3064
3065 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3066 {
3067         struct nfs4_exception exception = { };
3068         int err;
3069
3070         do {
3071                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3072                                 _nfs4_proc_getlk(state, cmd, request),
3073                                 &exception);
3074         } while (exception.retry);
3075         return err;
3076 }
3077
3078 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3079 {
3080         int res = 0;
3081         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3082                 case FL_POSIX:
3083                         res = posix_lock_file_wait(file, fl);
3084                         break;
3085                 case FL_FLOCK:
3086                         res = flock_lock_file_wait(file, fl);
3087                         break;
3088                 default:
3089                         BUG();
3090         }
3091         return res;
3092 }
3093
3094 struct nfs4_unlockdata {
3095         struct nfs_locku_args arg;
3096         struct nfs_locku_res res;
3097         struct nfs4_lock_state *lsp;
3098         struct nfs_open_context *ctx;
3099         struct file_lock fl;
3100         const struct nfs_server *server;
3101         unsigned long timestamp;
3102 };
3103
3104 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3105                 struct nfs_open_context *ctx,
3106                 struct nfs4_lock_state *lsp,
3107                 struct nfs_seqid *seqid)
3108 {
3109         struct nfs4_unlockdata *p;
3110         struct inode *inode = lsp->ls_state->inode;
3111
3112         p = kmalloc(sizeof(*p), GFP_KERNEL);
3113         if (p == NULL)
3114                 return NULL;
3115         p->arg.fh = NFS_FH(inode);
3116         p->arg.fl = &p->fl;
3117         p->arg.seqid = seqid;
3118         p->arg.stateid = &lsp->ls_stateid;
3119         p->lsp = lsp;
3120         atomic_inc(&lsp->ls_count);
3121         /* Ensure we don't close file until we're done freeing locks! */
3122         p->ctx = get_nfs_open_context(ctx);
3123         memcpy(&p->fl, fl, sizeof(p->fl));
3124         p->server = NFS_SERVER(inode);
3125         return p;
3126 }
3127
3128 static void nfs4_locku_release_calldata(void *data)
3129 {
3130         struct nfs4_unlockdata *calldata = data;
3131         nfs_free_seqid(calldata->arg.seqid);
3132         nfs4_put_lock_state(calldata->lsp);
3133         put_nfs_open_context(calldata->ctx);
3134         kfree(calldata);
3135 }
3136
3137 static void nfs4_locku_done(struct rpc_task *task, void *data)
3138 {
3139         struct nfs4_unlockdata *calldata = data;
3140
3141         if (RPC_ASSASSINATED(task))
3142                 return;
3143         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3144         switch (task->tk_status) {
3145                 case 0:
3146                         memcpy(calldata->lsp->ls_stateid.data,
3147                                         calldata->res.stateid.data,
3148                                         sizeof(calldata->lsp->ls_stateid.data));
3149                         renew_lease(calldata->server, calldata->timestamp);
3150                         break;
3151                 case -NFS4ERR_STALE_STATEID:
3152                 case -NFS4ERR_EXPIRED:
3153                         nfs4_schedule_state_recovery(calldata->server->nfs_client);
3154                         break;
3155                 default:
3156                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3157                                 rpc_restart_call(task);
3158                         }
3159         }
3160 }
3161
3162 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3163 {
3164         struct nfs4_unlockdata *calldata = data;
3165         struct rpc_message msg = {
3166                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3167                 .rpc_argp       = &calldata->arg,
3168                 .rpc_resp       = &calldata->res,
3169                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3170         };
3171
3172         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3173                 return;
3174         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3175                 /* Note: exit _without_ running nfs4_locku_done */
3176                 task->tk_action = NULL;
3177                 return;
3178         }
3179         calldata->timestamp = jiffies;
3180         rpc_call_setup(task, &msg, 0);
3181 }
3182
3183 static const struct rpc_call_ops nfs4_locku_ops = {
3184         .rpc_call_prepare = nfs4_locku_prepare,
3185         .rpc_call_done = nfs4_locku_done,
3186         .rpc_release = nfs4_locku_release_calldata,
3187 };
3188
3189 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3190                 struct nfs_open_context *ctx,
3191                 struct nfs4_lock_state *lsp,
3192                 struct nfs_seqid *seqid)
3193 {
3194         struct nfs4_unlockdata *data;
3195
3196         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3197         if (data == NULL) {
3198                 nfs_free_seqid(seqid);
3199                 return ERR_PTR(-ENOMEM);
3200         }
3201
3202         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3203 }
3204
3205 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3206 {
3207         struct nfs_seqid *seqid;
3208         struct nfs4_lock_state *lsp;
3209         struct rpc_task *task;
3210         int status = 0;
3211
3212         status = nfs4_set_lock_state(state, request);
3213         /* Unlock _before_ we do the RPC call */
3214         request->fl_flags |= FL_EXISTS;
3215         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3216                 goto out;
3217         if (status != 0)
3218                 goto out;
3219         /* Is this a delegated lock? */
3220         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3221                 goto out;
3222         lsp = request->fl_u.nfs4_fl.owner;
3223         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3224         status = -ENOMEM;
3225         if (seqid == NULL)
3226                 goto out;
3227         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3228         status = PTR_ERR(task);
3229         if (IS_ERR(task))
3230                 goto out;
3231         status = nfs4_wait_for_completion_rpc_task(task);
3232         rpc_put_task(task);
3233 out:
3234         return status;
3235 }
3236
3237 struct nfs4_lockdata {
3238         struct nfs_lock_args arg;
3239         struct nfs_lock_res res;
3240         struct nfs4_lock_state *lsp;
3241         struct nfs_open_context *ctx;
3242         struct file_lock fl;
3243         unsigned long timestamp;
3244         int rpc_status;
3245         int cancelled;
3246 };
3247
3248 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3249                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3250 {
3251         struct nfs4_lockdata *p;
3252         struct inode *inode = lsp->ls_state->inode;
3253         struct nfs_server *server = NFS_SERVER(inode);
3254
3255         p = kzalloc(sizeof(*p), GFP_KERNEL);
3256         if (p == NULL)
3257                 return NULL;
3258
3259         p->arg.fh = NFS_FH(inode);
3260         p->arg.fl = &p->fl;
3261         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3262         if (p->arg.lock_seqid == NULL)
3263                 goto out_free;
3264         p->arg.lock_stateid = &lsp->ls_stateid;
3265         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3266         p->arg.lock_owner.id = lsp->ls_id;
3267         p->lsp = lsp;
3268         atomic_inc(&lsp->ls_count);
3269         p->ctx = get_nfs_open_context(ctx);
3270         memcpy(&p->fl, fl, sizeof(p->fl));
3271         return p;
3272 out_free:
3273         kfree(p);
3274         return NULL;
3275 }
3276
3277 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3278 {
3279         struct nfs4_lockdata *data = calldata;
3280         struct nfs4_state *state = data->lsp->ls_state;
3281         struct nfs4_state_owner *sp = state->owner;
3282         struct rpc_message msg = {
3283                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3284                 .rpc_argp = &data->arg,
3285                 .rpc_resp = &data->res,
3286                 .rpc_cred = sp->so_cred,
3287         };
3288
3289         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3290                 return;
3291         dprintk("%s: begin!\n", __FUNCTION__);
3292         /* Do we need to do an open_to_lock_owner? */
3293         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3294                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3295                 if (data->arg.open_seqid == NULL) {
3296                         data->rpc_status = -ENOMEM;
3297                         task->tk_action = NULL;
3298                         goto out;
3299                 }
3300                 data->arg.open_stateid = &state->stateid;
3301                 data->arg.new_lock_owner = 1;
3302         }
3303         data->timestamp = jiffies;
3304         rpc_call_setup(task, &msg, 0);
3305 out:
3306         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3307 }
3308
3309 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3310 {
3311         struct nfs4_lockdata *data = calldata;
3312
3313         dprintk("%s: begin!\n", __FUNCTION__);
3314
3315         data->rpc_status = task->tk_status;
3316         if (RPC_ASSASSINATED(task))
3317                 goto out;
3318         if (data->arg.new_lock_owner != 0) {
3319                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3320                 if (data->rpc_status == 0)
3321                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3322                 else
3323                         goto out;
3324         }
3325         if (data->rpc_status == 0) {
3326                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3327                                         sizeof(data->lsp->ls_stateid.data));
3328                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3329                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3330         }
3331         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3332 out:
3333         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3334 }
3335
3336 static void nfs4_lock_release(void *calldata)
3337 {
3338         struct nfs4_lockdata *data = calldata;
3339
3340         dprintk("%s: begin!\n", __FUNCTION__);
3341         if (data->arg.open_seqid != NULL)
3342                 nfs_free_seqid(data->arg.open_seqid);
3343         if (data->cancelled != 0) {
3344                 struct rpc_task *task;
3345                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3346                                 data->arg.lock_seqid);
3347                 if (!IS_ERR(task))
3348                         rpc_put_task(task);
3349                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3350         } else
3351                 nfs_free_seqid(data->arg.lock_seqid);
3352         nfs4_put_lock_state(data->lsp);
3353         put_nfs_open_context(data->ctx);
3354         kfree(data);
3355         dprintk("%s: done!\n", __FUNCTION__);
3356 }
3357
3358 static const struct rpc_call_ops nfs4_lock_ops = {
3359         .rpc_call_prepare = nfs4_lock_prepare,
3360         .rpc_call_done = nfs4_lock_done,
3361         .rpc_release = nfs4_lock_release,
3362 };
3363
3364 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3365 {
3366         struct nfs4_lockdata *data;
3367         struct rpc_task *task;
3368         int ret;
3369
3370         dprintk("%s: begin!\n", __FUNCTION__);
3371         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3372                         fl->fl_u.nfs4_fl.owner);
3373         if (data == NULL)
3374                 return -ENOMEM;
3375         if (IS_SETLKW(cmd))
3376                 data->arg.block = 1;
3377         if (reclaim != 0)
3378                 data->arg.reclaim = 1;
3379         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3380                         &nfs4_lock_ops, data);
3381         if (IS_ERR(task))
3382                 return PTR_ERR(task);
3383         ret = nfs4_wait_for_completion_rpc_task(task);
3384         if (ret == 0) {
3385                 ret = data->rpc_status;
3386                 if (ret == -NFS4ERR_DENIED)
3387                         ret = -EAGAIN;
3388         } else
3389                 data->cancelled = 1;
3390         rpc_put_task(task);
3391         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3392         return ret;
3393 }
3394
3395 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3396 {
3397         struct nfs_server *server = NFS_SERVER(state->inode);
3398         struct nfs4_exception exception = { };
3399         int err;
3400
3401         do {
3402                 /* Cache the lock if possible... */
3403                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3404                         return 0;
3405                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3406                 if (err != -NFS4ERR_DELAY)
3407                         break;
3408                 nfs4_handle_exception(server, err, &exception);
3409         } while (exception.retry);
3410         return err;
3411 }
3412
3413 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3414 {
3415         struct nfs_server *server = NFS_SERVER(state->inode);
3416         struct nfs4_exception exception = { };
3417         int err;
3418
3419         err = nfs4_set_lock_state(state, request);
3420         if (err != 0)
3421                 return err;
3422         do {
3423                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3424                         return 0;
3425                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3426                 if (err != -NFS4ERR_DELAY)
3427                         break;
3428                 nfs4_handle_exception(server, err, &exception);
3429         } while (exception.retry);
3430         return err;
3431 }
3432
3433 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3434 {
3435         struct nfs_client *clp = state->owner->so_client;
3436         unsigned char fl_flags = request->fl_flags;
3437         int status;
3438
3439         /* Is this a delegated open? */
3440         status = nfs4_set_lock_state(state, request);
3441         if (status != 0)
3442                 goto out;
3443         request->fl_flags |= FL_ACCESS;
3444         status = do_vfs_lock(request->fl_file, request);
3445         if (status < 0)
3446                 goto out;
3447         down_read(&clp->cl_sem);
3448         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3449                 struct nfs_inode *nfsi = NFS_I(state->inode);
3450                 /* Yes: cache locks! */
3451                 down_read(&nfsi->rwsem);
3452                 /* ...but avoid races with delegation recall... */
3453                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3454                         request->fl_flags = fl_flags & ~FL_SLEEP;
3455                         status = do_vfs_lock(request->fl_file, request);
3456                         up_read(&nfsi->rwsem);
3457                         goto out_unlock;
3458                 }
3459                 up_read(&nfsi->rwsem);
3460         }
3461         status = _nfs4_do_setlk(state, cmd, request, 0);
3462         if (status != 0)
3463                 goto out_unlock;
3464         /* Note: we always want to sleep here! */
3465         request->fl_flags = fl_flags | FL_SLEEP;
3466         if (do_vfs_lock(request->fl_file, request) < 0)
3467                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3468 out_unlock:
3469         up_read(&clp->cl_sem);
3470 out:
3471         request->fl_flags = fl_flags;
3472         return status;
3473 }
3474
3475 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3476 {
3477         struct nfs4_exception exception = { };
3478         int err;
3479
3480         do {
3481                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3482                                 _nfs4_proc_setlk(state, cmd, request),
3483                                 &exception);
3484         } while (exception.retry);
3485         return err;
3486 }
3487
3488 static int
3489 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3490 {
3491         struct nfs_open_context *ctx;
3492         struct nfs4_state *state;
3493         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3494         int status;
3495
3496         /* verify open state */
3497         ctx = (struct nfs_open_context *)filp->private_data;
3498         state = ctx->state;
3499
3500         if (request->fl_start < 0 || request->fl_end < 0)
3501                 return -EINVAL;
3502
3503         if (IS_GETLK(cmd))
3504                 return nfs4_proc_getlk(state, F_GETLK, request);
3505
3506         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3507                 return -EINVAL;
3508
3509         if (request->fl_type == F_UNLCK)
3510                 return nfs4_proc_unlck(state, cmd, request);
3511
3512         do {
3513                 status = nfs4_proc_setlk(state, cmd, request);
3514                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3515                         break;
3516                 timeout = nfs4_set_lock_task_retry(timeout);
3517                 status = -ERESTARTSYS;
3518                 if (signalled())
3519                         break;
3520         } while(status < 0);
3521         return status;
3522 }
3523
3524 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3525 {
3526         struct nfs_server *server = NFS_SERVER(state->inode);
3527         struct nfs4_exception exception = { };
3528         int err;
3529
3530         err = nfs4_set_lock_state(state, fl);
3531         if (err != 0)
3532                 goto out;
3533         do {
3534                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3535                 if (err != -NFS4ERR_DELAY)
3536                         break;
3537                 err = nfs4_handle_exception(server, err, &exception);
3538         } while (exception.retry);
3539 out:
3540         return err;
3541 }
3542
3543 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3544
3545 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3546                 size_t buflen, int flags)
3547 {
3548         struct inode *inode = dentry->d_inode;
3549
3550         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3551                 return -EOPNOTSUPP;
3552
3553         if (!S_ISREG(inode->i_mode) &&
3554             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3555                 return -EPERM;
3556
3557         return nfs4_proc_set_acl(inode, buf, buflen);
3558 }
3559
3560 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3561  * and that's what we'll do for e.g. user attributes that haven't been set.
3562  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3563  * attributes in kernel-managed attribute namespaces. */
3564 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3565                 size_t buflen)
3566 {
3567         struct inode *inode = dentry->d_inode;
3568
3569         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3570                 return -EOPNOTSUPP;
3571
3572         return nfs4_proc_get_acl(inode, buf, buflen);
3573 }
3574
3575 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3576 {
3577         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3578
3579         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3580                 return 0;
3581         if (buf && buflen < len)
3582                 return -ERANGE;
3583         if (buf)
3584                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3585         return len;
3586 }
3587
3588 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3589                 struct nfs4_fs_locations *fs_locations, struct page *page)
3590 {
3591         struct nfs_server *server = NFS_SERVER(dir);
3592         u32 bitmask[2] = {
3593                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3594                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3595         };
3596         struct nfs4_fs_locations_arg args = {
3597                 .dir_fh = NFS_FH(dir),
3598                 .name = &dentry->d_name,
3599                 .page = page,
3600                 .bitmask = bitmask,
3601         };
3602         struct rpc_message msg = {
3603                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3604                 .rpc_argp = &args,
3605                 .rpc_resp = fs_locations,
3606         };
3607         int status;
3608
3609         dprintk("%s: start\n", __FUNCTION__);
3610         fs_locations->fattr.valid = 0;
3611         fs_locations->server = server;
3612         fs_locations->nlocations = 0;
3613         status = rpc_call_sync(server->client, &msg, 0);
3614         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3615         return status;
3616 }
3617
3618 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3619         .recover_open   = nfs4_open_reclaim,
3620         .recover_lock   = nfs4_lock_reclaim,
3621 };
3622
3623 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3624         .recover_open   = nfs4_open_expired,
3625         .recover_lock   = nfs4_lock_expired,
3626 };
3627
3628 static struct inode_operations nfs4_file_inode_operations = {
3629         .permission     = nfs_permission,
3630         .getattr        = nfs_getattr,
3631         .setattr        = nfs_setattr,
3632         .getxattr       = nfs4_getxattr,
3633         .setxattr       = nfs4_setxattr,
3634         .listxattr      = nfs4_listxattr,
3635 };
3636
3637 const struct nfs_rpc_ops nfs_v4_clientops = {
3638         .version        = 4,                    /* protocol version */
3639         .dentry_ops     = &nfs4_dentry_operations,
3640         .dir_inode_ops  = &nfs4_dir_inode_operations,
3641         .file_inode_ops = &nfs4_file_inode_operations,
3642         .getroot        = nfs4_proc_get_root,
3643         .getattr        = nfs4_proc_getattr,
3644         .setattr        = nfs4_proc_setattr,
3645         .lookupfh       = nfs4_proc_lookupfh,
3646         .lookup         = nfs4_proc_lookup,
3647         .access         = nfs4_proc_access,
3648         .readlink       = nfs4_proc_readlink,
3649         .read           = nfs4_proc_read,
3650         .create         = nfs4_proc_create,
3651         .remove         = nfs4_proc_remove,
3652         .unlink_setup   = nfs4_proc_unlink_setup,
3653         .unlink_done    = nfs4_proc_unlink_done,
3654         .rename         = nfs4_proc_rename,
3655         .link           = nfs4_proc_link,
3656         .symlink        = nfs4_proc_symlink,
3657         .mkdir          = nfs4_proc_mkdir,
3658         .rmdir          = nfs4_proc_remove,
3659         .readdir        = nfs4_proc_readdir,
3660         .mknod          = nfs4_proc_mknod,
3661         .statfs         = nfs4_proc_statfs,
3662         .fsinfo         = nfs4_proc_fsinfo,
3663         .pathconf       = nfs4_proc_pathconf,
3664         .set_capabilities = nfs4_server_capabilities,
3665         .decode_dirent  = nfs4_decode_dirent,
3666         .read_setup     = nfs4_proc_read_setup,
3667         .read_done      = nfs4_read_done,
3668         .write_setup    = nfs4_proc_write_setup,
3669         .write_done     = nfs4_write_done,
3670         .commit_setup   = nfs4_proc_commit_setup,
3671         .commit_done    = nfs4_commit_done,
3672         .file_open      = nfs_open,
3673         .file_release   = nfs_release,
3674         .lock           = nfs4_proc_lock,
3675         .clear_acl_cache = nfs4_zap_acl_attr,
3676 };
3677
3678 /*
3679  * Local variables:
3680  *  c-basic-offset: 8
3681  * End:
3682  */