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
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
  61 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  62 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  63 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  64 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  65 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  66 extern struct rpc_procinfo nfs4_procedures[];
  67
  68 /* Prevent leaks of NFSv4 errors into userland */
  69 int nfs4_map_errors(int err)
  70 {
  71         if (err < -1000) {
  72                 dprintk("%s could not handle NFSv4 error %d\n",
  73                                 __FUNCTION__, -err);
  74                 return -EIO;
  75         }
  76         return err;
  77 }
  78
  79 /*
  80  * This is our standard bitmap for GETATTR requests.
  81  */
  82 const u32 nfs4_fattr_bitmap[2] = {
  83         FATTR4_WORD0_TYPE
  84         | FATTR4_WORD0_CHANGE
  85         | FATTR4_WORD0_SIZE
  86         | FATTR4_WORD0_FSID
  87         | FATTR4_WORD0_FILEID,
  88         FATTR4_WORD1_MODE
  89         | FATTR4_WORD1_NUMLINKS
  90         | FATTR4_WORD1_OWNER
  91         | FATTR4_WORD1_OWNER_GROUP
  92         | FATTR4_WORD1_RAWDEV
  93         | FATTR4_WORD1_SPACE_USED
  94         | FATTR4_WORD1_TIME_ACCESS
  95         | FATTR4_WORD1_TIME_METADATA
  96         | FATTR4_WORD1_TIME_MODIFY
  97 };
  98
  99 const u32 nfs4_statfs_bitmap[2] = {
 100         FATTR4_WORD0_FILES_AVAIL
 101         | FATTR4_WORD0_FILES_FREE
 102         | FATTR4_WORD0_FILES_TOTAL,
 103         FATTR4_WORD1_SPACE_AVAIL
 104         | FATTR4_WORD1_SPACE_FREE
 105         | FATTR4_WORD1_SPACE_TOTAL
 106 };
 107
 108 const u32 nfs4_pathconf_bitmap[2] = {
 109         FATTR4_WORD0_MAXLINK
 110         | FATTR4_WORD0_MAXNAME,
 111         0
 112 };
 113
 114 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 115                         | FATTR4_WORD0_MAXREAD
 116                         | FATTR4_WORD0_MAXWRITE
 117                         | FATTR4_WORD0_LEASE_TIME,
 118                         0
 119 };
 120
 121 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 122                 struct nfs4_readdir_arg *readdir)
 123 {
 124         u32 *start, *p;
 125
 126         BUG_ON(readdir->count < 80);
 127         if (cookie > 2) {
 128                 readdir->cookie = cookie;
 129                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 130                 return;
 131         }
 132
 133         readdir->cookie = 0;
 134         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 135         if (cookie == 2)
 136                 return;
 137
 138         /*
 139          * NFSv4 servers do not return entries for '.' and '..'
 140          * Therefore, we fake these entries here.  We let '.'
 141          * have cookie 0 and '..' have cookie 1.  Note that
 142          * when talking to the server, we always send cookie 0
 143          * instead of 1 or 2.
 144          */
 145         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 146
 147         if (cookie == 0) {
 148                 *p++ = xdr_one;                                  /* next */
 149                 *p++ = xdr_zero;                   /* cookie, first word */
 150                 *p++ = xdr_one;                   /* cookie, second word */
 151                 *p++ = xdr_one;                             /* entry len */
 152                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 153                 p++;
 154                 *p++ = xdr_one;                         /* bitmap length */
 155                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 156                 *p++ = htonl(8);              /* attribute buffer length */
 157                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 158         }
 159
 160         *p++ = xdr_one;                                  /* next */
 161         *p++ = xdr_zero;                   /* cookie, first word */
 162         *p++ = xdr_two;                   /* cookie, second word */
 163         *p++ = xdr_two;                             /* entry len */
 164         memcpy(p, "..\0\0", 4);                         /* entry */
 165         p++;
 166         *p++ = xdr_one;                         /* bitmap length */
 167         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 168         *p++ = htonl(8);              /* attribute buffer length */
 169         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 170
 171         readdir->pgbase = (char *)p - (char *)start;
 172         readdir->count -= readdir->pgbase;
 173         kunmap_atomic(start, KM_USER0);
 174 }
 175
 176 static void
 177 renew_lease(struct nfs_server *server, unsigned long timestamp)
 178 {
 179         struct nfs4_client *clp = server->nfs4_state;
 180         spin_lock(&clp->cl_lock);
 181         if (time_before(clp->cl_last_renewal,timestamp))
 182                 clp->cl_last_renewal = timestamp;
 183         spin_unlock(&clp->cl_lock);
 184 }
 185
 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 187 {
 188         struct nfs_inode *nfsi = NFS_I(inode);
 189
 190         spin_lock(&inode->i_lock);
 191         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 192         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 193                 nfsi->change_attr = cinfo->after;
 194         spin_unlock(&inode->i_lock);
 195 }
 196
 197 /* Helper for asynchronous RPC calls */
 198 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
 199                 rpc_action tk_exit, void *calldata)
 200 {
 201         struct rpc_task *task;
 202
 203         if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
 204                 return -ENOMEM;
 205
 206         task->tk_calldata = calldata;
 207         task->tk_action = tk_begin;
 208         rpc_execute(task);
 209         return 0;
 210 }
 211
 212 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 213 {
 214         struct inode *inode = state->inode;
 215
 216         open_flags &= (FMODE_READ|FMODE_WRITE);
 217         /* Protect against nfs4_find_state() */
 218         spin_lock(&state->owner->so_lock);
 219         spin_lock(&inode->i_lock);
 220         state->state |= open_flags;
 221         /* NB! List reordering - see the reclaim code for why.  */
 222         if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
 223                 list_move(&state->open_states, &state->owner->so_states);
 224         if (open_flags & FMODE_READ)
 225                 state->nreaders++;
 226         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 227         spin_unlock(&inode->i_lock);
 228         spin_unlock(&state->owner->so_lock);
 229 }
 230
 231 /*
 232  * OPEN_RECLAIM:
 233  *      reclaim state on the server after a reboot.
 234  */
 235 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 236 {
 237         struct inode *inode = state->inode;
 238         struct nfs_server *server = NFS_SERVER(inode);
 239         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 240         struct nfs_openargs o_arg = {
 241                 .fh = NFS_FH(inode),
 242                 .id = sp->so_id,
 243                 .open_flags = state->state,
 244                 .clientid = server->nfs4_state->cl_clientid,
 245                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 246                 .bitmask = server->attr_bitmask,
 247         };
 248         struct nfs_openres o_res = {
 249                 .server = server,       /* Grrr */
 250         };
 251         struct rpc_message msg = {
 252                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 253                 .rpc_argp       = &o_arg,
 254                 .rpc_resp       = &o_res,
 255                 .rpc_cred       = sp->so_cred,
 256         };
 257         int status;
 258
 259         if (delegation != NULL) {
 260                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 261                         memcpy(&state->stateid, &delegation->stateid,
 262                                         sizeof(state->stateid));
 263                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 264                         return 0;
 265                 }
 266                 o_arg.u.delegation_type = delegation->type;
 267         }
 268         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 269         if (o_arg.seqid == NULL)
 270                 return -ENOMEM;
 271         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 272         /* Confirm the sequence as being established */
 273         nfs_confirm_seqid(&sp->so_seqid, status);
 274         nfs_increment_open_seqid(status, o_arg.seqid);
 275         if (status == 0) {
 276                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 277                 if (o_res.delegation_type != 0) {
 278                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 279                         /* Did the server issue an immediate delegation recall? */
 280                         if (o_res.do_recall)
 281                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 282                 }
 283         }
 284         nfs_free_seqid(o_arg.seqid);
 285         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 286         /* Ensure we update the inode attributes */
 287         NFS_CACHEINV(inode);
 288         return status;
 289 }
 290
 291 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 292 {
 293         struct nfs_server *server = NFS_SERVER(state->inode);
 294         struct nfs4_exception exception = { };
 295         int err;
 296         do {
 297                 err = _nfs4_open_reclaim(sp, state);
 298                 if (err != -NFS4ERR_DELAY)
 299                         break;
 300                 nfs4_handle_exception(server, err, &exception);
 301         } while (exception.retry);
 302         return err;
 303 }
 304
 305 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 306 {
 307         struct nfs4_state_owner  *sp  = state->owner;
 308         struct inode *inode = dentry->d_inode;
 309         struct nfs_server *server = NFS_SERVER(inode);
 310         struct dentry *parent = dget_parent(dentry);
 311         struct nfs_openargs arg = {
 312                 .fh = NFS_FH(parent->d_inode),
 313                 .clientid = server->nfs4_state->cl_clientid,
 314                 .name = &dentry->d_name,
 315                 .id = sp->so_id,
 316                 .server = server,
 317                 .bitmask = server->attr_bitmask,
 318                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 319         };
 320         struct nfs_openres res = {
 321                 .server = server,
 322         };
 323         struct  rpc_message msg = {
 324                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 325                 .rpc_argp       = &arg,
 326                 .rpc_resp       = &res,
 327                 .rpc_cred       = sp->so_cred,
 328         };
 329         int status = 0;
 330
 331         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 332                 goto out;
 333         if (state->state == 0)
 334                 goto out;
 335         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 336         status = -ENOMEM;
 337         if (arg.seqid == NULL)
 338                 goto out;
 339         arg.open_flags = state->state;
 340         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 341         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 342         nfs_increment_open_seqid(status, arg.seqid);
 343         if (status != 0)
 344                 goto out_free;
 345         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 346                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 347                                 sp, &res.stateid, arg.seqid);
 348                 if (status != 0)
 349                         goto out_free;
 350         }
 351         nfs_confirm_seqid(&sp->so_seqid, 0);
 352         if (status >= 0) {
 353                 memcpy(state->stateid.data, res.stateid.data,
 354                                 sizeof(state->stateid.data));
 355                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 356         }
 357 out_free:
 358         nfs_free_seqid(arg.seqid);
 359 out:
 360         dput(parent);
 361         return status;
 362 }
 363
 364 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 365 {
 366         struct nfs4_exception exception = { };
 367         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 368         int err;
 369         do {
 370                 err = _nfs4_open_delegation_recall(dentry, state);
 371                 switch (err) {
 372                         case 0:
 373                                 return err;
 374                         case -NFS4ERR_STALE_CLIENTID:
 375                         case -NFS4ERR_STALE_STATEID:
 376                         case -NFS4ERR_EXPIRED:
 377                                 /* Don't recall a delegation if it was lost */
 378                                 nfs4_schedule_state_recovery(server->nfs4_state);
 379                                 return err;
 380                 }
 381                 err = nfs4_handle_exception(server, err, &exception);
 382         } while (exception.retry);
 383         return err;
 384 }
 385
 386 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
 387 {
 388         struct nfs_open_confirmargs arg = {
 389                 .fh             = fh,
 390                 .seqid          = seqid,
 391                 .stateid        = *stateid,
 392         };
 393         struct nfs_open_confirmres res;
 394         struct  rpc_message msg = {
 395                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 396                 .rpc_argp       = &arg,
 397                 .rpc_resp       = &res,
 398                 .rpc_cred       = sp->so_cred,
 399         };
 400         int status;
 401
 402         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 403         /* Confirm the sequence as being established */
 404         nfs_confirm_seqid(&sp->so_seqid, status);
 405         nfs_increment_open_seqid(status, seqid);
 406         if (status >= 0)
 407                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 408         return status;
 409 }
 410
 411 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 412 {
 413         struct nfs_server *server = NFS_SERVER(dir);
 414         struct rpc_message msg = {
 415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 416                 .rpc_argp = o_arg,
 417                 .rpc_resp = o_res,
 418                 .rpc_cred = sp->so_cred,
 419         };
 420         int status;
 421
 422         /* Update sequence id. The caller must serialize! */
 423         o_arg->id = sp->so_id;
 424         o_arg->clientid = sp->so_client->cl_clientid;
 425
 426         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 427         if (status == 0) {
 428                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 429                 switch (o_res->f_attr->mode & S_IFMT) {
 430                         case S_IFREG:
 431                                 break;
 432                         case S_IFLNK:
 433                                 status = -ELOOP;
 434                                 break;
 435                         case S_IFDIR:
 436                                 status = -EISDIR;
 437                                 break;
 438                         default:
 439                                 status = -ENOTDIR;
 440                 }
 441         }
 442
 443         nfs_increment_open_seqid(status, o_arg->seqid);
 444         if (status != 0)
 445                 goto out;
 446         if (o_arg->open_flags & O_CREAT) {
 447                 update_changeattr(dir, &o_res->cinfo);
 448                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 449         } else
 450                 nfs_refresh_inode(dir, o_res->dir_attr);
 451         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 452                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 453                                 sp, &o_res->stateid, o_arg->seqid);
 454                 if (status != 0)
 455                         goto out;
 456         }
 457         nfs_confirm_seqid(&sp->so_seqid, 0);
 458         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 459                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 460 out:
 461         return status;
 462 }
 463
 464 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 465 {
 466         struct nfs_access_entry cache;
 467         int mask = 0;
 468         int status;
 469
 470         if (openflags & FMODE_READ)
 471                 mask |= MAY_READ;
 472         if (openflags & FMODE_WRITE)
 473                 mask |= MAY_WRITE;
 474         status = nfs_access_get_cached(inode, cred, &cache);
 475         if (status == 0)
 476                 goto out;
 477
 478         /* Be clever: ask server to check for all possible rights */
 479         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 480         cache.cred = cred;
 481         cache.jiffies = jiffies;
 482         status = _nfs4_proc_access(inode, &cache);
 483         if (status != 0)
 484                 return status;
 485         nfs_access_add_cache(inode, &cache);
 486 out:
 487         if ((cache.mask & mask) == mask)
 488                 return 0;
 489         return -EACCES;
 490 }
 491
 492 /*
 493  * OPEN_EXPIRED:
 494  *      reclaim state on the server after a network partition.
 495  *      Assumes caller holds the appropriate lock
 496  */
 497 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 498 {
 499         struct dentry *parent = dget_parent(dentry);
 500         struct inode *dir = parent->d_inode;
 501         struct inode *inode = state->inode;
 502         struct nfs_server *server = NFS_SERVER(dir);
 503         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 504         struct nfs_fattr f_attr, dir_attr;
 505         struct nfs_openargs o_arg = {
 506                 .fh = NFS_FH(dir),
 507                 .open_flags = state->state,
 508                 .name = &dentry->d_name,
 509                 .bitmask = server->attr_bitmask,
 510                 .claim = NFS4_OPEN_CLAIM_NULL,
 511         };
 512         struct nfs_openres o_res = {
 513                 .f_attr = &f_attr,
 514                 .dir_attr = &dir_attr,
 515                 .server = server,
 516         };
 517         int status = 0;
 518
 519         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 520                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 521                 if (status < 0)
 522                         goto out;
 523                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 524                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 525                 goto out;
 526         }
 527         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 528         status = -ENOMEM;
 529         if (o_arg.seqid == NULL)
 530                 goto out;
 531         nfs_fattr_init(&f_attr);
 532         nfs_fattr_init(&dir_attr);
 533         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 534         if (status != 0)
 535                 goto out_nodeleg;
 536         /* Check if files differ */
 537         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 538                 goto out_stale;
 539         /* Has the file handle changed? */
 540         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 541                 /* Verify if the change attributes are the same */
 542                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 543                         goto out_stale;
 544                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 545                         goto out_stale;
 546                 /* Lets just pretend that this is the same file */
 547                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 548                 NFS_I(inode)->fileid = f_attr.fileid;
 549         }
 550         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 551         if (o_res.delegation_type != 0) {
 552                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 553                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 554                 else
 555                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 556         }
 557 out_nodeleg:
 558         nfs_free_seqid(o_arg.seqid);
 559         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 560 out:
 561         dput(parent);
 562         return status;
 563 out_stale:
 564         status = -ESTALE;
 565         /* Invalidate the state owner so we don't ever use it again */
 566         nfs4_drop_state_owner(sp);
 567         d_drop(dentry);
 568         /* Should we be trying to close that stateid? */
 569         goto out_nodeleg;
 570 }
 571
 572 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 573 {
 574         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 575         struct nfs4_exception exception = { };
 576         int err;
 577
 578         do {
 579                 err = _nfs4_open_expired(sp, state, dentry);
 580                 if (err == -NFS4ERR_DELAY)
 581                         nfs4_handle_exception(server, err, &exception);
 582         } while (exception.retry);
 583         return err;
 584 }
 585
 586 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 587 {
 588         struct nfs_inode *nfsi = NFS_I(state->inode);
 589         struct nfs_open_context *ctx;
 590         int status;
 591
 592         spin_lock(&state->inode->i_lock);
 593         list_for_each_entry(ctx, &nfsi->open_files, list) {
 594                 if (ctx->state != state)
 595                         continue;
 596                 get_nfs_open_context(ctx);
 597                 spin_unlock(&state->inode->i_lock);
 598                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 599                 put_nfs_open_context(ctx);
 600                 return status;
 601         }
 602         spin_unlock(&state->inode->i_lock);
 603         return -ENOENT;
 604 }
 605
 606 /*
 607  * Returns an nfs4_state + an extra reference to the inode
 608  */
 609 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 610 {
 611         struct nfs_delegation *delegation;
 612         struct nfs_server *server = NFS_SERVER(inode);
 613         struct nfs4_client *clp = server->nfs4_state;
 614         struct nfs_inode *nfsi = NFS_I(inode);
 615         struct nfs4_state_owner *sp = NULL;
 616         struct nfs4_state *state = NULL;
 617         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 618         int err;
 619
 620         /* Protect against reboot recovery - NOTE ORDER! */
 621         down_read(&clp->cl_sem);
 622         /* Protect against delegation recall */
 623         down_read(&nfsi->rwsem);
 624         delegation = NFS_I(inode)->delegation;
 625         err = -ENOENT;
 626         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 627                 goto out_err;
 628         err = -ENOMEM;
 629         if (!(sp = nfs4_get_state_owner(server, cred))) {
 630                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 631                 goto out_err;
 632         }
 633         state = nfs4_get_open_state(inode, sp);
 634         if (state == NULL)
 635                 goto out_err;
 636
 637         err = -ENOENT;
 638         if ((state->state & open_flags) == open_flags) {
 639                 spin_lock(&inode->i_lock);
 640                 if (open_flags & FMODE_READ)
 641                         state->nreaders++;
 642                 if (open_flags & FMODE_WRITE)
 643                         state->nwriters++;
 644                 spin_unlock(&inode->i_lock);
 645                 goto out_ok;
 646         } else if (state->state != 0)
 647                 goto out_err;
 648
 649         lock_kernel();
 650         err = _nfs4_do_access(inode, cred, open_flags);
 651         unlock_kernel();
 652         if (err != 0)
 653                 goto out_err;
 654         set_bit(NFS_DELEGATED_STATE, &state->flags);
 655         update_open_stateid(state, &delegation->stateid, open_flags);
 656 out_ok:
 657         nfs4_put_state_owner(sp);
 658         up_read(&nfsi->rwsem);
 659         up_read(&clp->cl_sem);
 660         igrab(inode);
 661         *res = state;
 662         return 0;
 663 out_err:
 664         if (sp != NULL) {
 665                 if (state != NULL)
 666                         nfs4_put_open_state(state);
 667                 nfs4_put_state_owner(sp);
 668         }
 669         up_read(&nfsi->rwsem);
 670         up_read(&clp->cl_sem);
 671         if (err != -EACCES)
 672                 nfs_inode_return_delegation(inode);
 673         return err;
 674 }
 675
 676 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 677 {
 678         struct nfs4_exception exception = { };
 679         struct nfs4_state *res;
 680         int err;
 681
 682         do {
 683                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 684                 if (err == 0)
 685                         break;
 686                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 687                                         err, &exception));
 688         } while (exception.retry);
 689         return res;
 690 }
 691
 692 /*
 693  * Returns an nfs4_state + an referenced inode
 694  */
 695 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 696 {
 697         struct nfs4_state_owner  *sp;
 698         struct nfs4_state     *state = NULL;
 699         struct nfs_server       *server = NFS_SERVER(dir);
 700         struct nfs4_client *clp = server->nfs4_state;
 701         struct inode *inode = NULL;
 702         int                     status;
 703         struct nfs_fattr f_attr, dir_attr;
 704         struct nfs_openargs o_arg = {
 705                 .fh             = NFS_FH(dir),
 706                 .open_flags     = flags,
 707                 .name           = &dentry->d_name,
 708                 .server         = server,
 709                 .bitmask = server->attr_bitmask,
 710                 .claim = NFS4_OPEN_CLAIM_NULL,
 711         };
 712         struct nfs_openres o_res = {
 713                 .f_attr         = &f_attr,
 714                 .dir_attr       = &dir_attr,
 715                 .server         = server,
 716         };
 717
 718         /* Protect against reboot recovery conflicts */
 719         down_read(&clp->cl_sem);
 720         status = -ENOMEM;
 721         if (!(sp = nfs4_get_state_owner(server, cred))) {
 722                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 723                 goto out_err;
 724         }
 725         if (flags & O_EXCL) {
 726                 u32 *p = (u32 *) o_arg.u.verifier.data;
 727                 p[0] = jiffies;
 728                 p[1] = current->pid;
 729         } else
 730                 o_arg.u.attrs = sattr;
 731         /* Serialization for the sequence id */
 732
 733         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 734         if (o_arg.seqid == NULL)
 735                 return -ENOMEM;
 736         nfs_fattr_init(&f_attr);
 737         nfs_fattr_init(&dir_attr);
 738         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 739         if (status != 0)
 740                 goto out_err;
 741
 742         status = -ENOMEM;
 743         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 744         if (!inode)
 745                 goto out_err;
 746         state = nfs4_get_open_state(inode, sp);
 747         if (!state)
 748                 goto out_err;
 749         update_open_stateid(state, &o_res.stateid, flags);
 750         if (o_res.delegation_type != 0)
 751                 nfs_inode_set_delegation(inode, cred, &o_res);
 752         nfs_free_seqid(o_arg.seqid);
 753         nfs4_put_state_owner(sp);
 754         up_read(&clp->cl_sem);
 755         *res = state;
 756         return 0;
 757 out_err:
 758         if (sp != NULL) {
 759                 if (state != NULL)
 760                         nfs4_put_open_state(state);
 761                 nfs_free_seqid(o_arg.seqid);
 762                 nfs4_put_state_owner(sp);
 763         }
 764         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 765         up_read(&clp->cl_sem);
 766         if (inode != NULL)
 767                 iput(inode);
 768         *res = NULL;
 769         return status;
 770 }
 771
 772
 773 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 774 {
 775         struct nfs4_exception exception = { };
 776         struct nfs4_state *res;
 777         int status;
 778
 779         do {
 780                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 781                 if (status == 0)
 782                         break;
 783                 /* NOTE: BAD_SEQID means the server and client disagree about the
 784                  * book-keeping w.r.t. state-changing operations
 785                  * (OPEN/CLOSE/LOCK/LOCKU...)
 786                  * It is actually a sign of a bug on the client or on the server.
 787                  *
 788                  * If we receive a BAD_SEQID error in the particular case of
 789                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 790                  * have unhashed the old state_owner for us, and that we can
 791                  * therefore safely retry using a new one. We should still warn
 792                  * the user though...
 793                  */
 794                 if (status == -NFS4ERR_BAD_SEQID) {
 795                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 796                         exception.retry = 1;
 797                         continue;
 798                 }
 799                 /*
 800                  * BAD_STATEID on OPEN means that the server cancelled our
 801                  * state before it received the OPEN_CONFIRM.
 802                  * Recover by retrying the request as per the discussion
 803                  * on Page 181 of RFC3530.
 804                  */
 805                 if (status == -NFS4ERR_BAD_STATEID) {
 806                         exception.retry = 1;
 807                         continue;
 808                 }
 809                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 810                                         status, &exception));
 811         } while (exception.retry);
 812         return res;
 813 }
 814
 815 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 816                 struct nfs_fh *fhandle, struct iattr *sattr,
 817                 struct nfs4_state *state)
 818 {
 819         struct nfs_setattrargs  arg = {
 820                 .fh             = fhandle,
 821                 .iap            = sattr,
 822                 .server         = server,
 823                 .bitmask = server->attr_bitmask,
 824         };
 825         struct nfs_setattrres  res = {
 826                 .fattr          = fattr,
 827                 .server         = server,
 828         };
 829         struct rpc_message msg = {
 830                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 831                 .rpc_argp       = &arg,
 832                 .rpc_resp       = &res,
 833         };
 834         int status;
 835
 836         nfs_fattr_init(fattr);
 837
 838         if (state != NULL) {
 839                 msg.rpc_cred = state->owner->so_cred;
 840                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 841         } else
 842                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 843
 844         status = rpc_call_sync(server->client, &msg, 0);
 845         return status;
 846 }
 847
 848 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 849                 struct nfs_fh *fhandle, struct iattr *sattr,
 850                 struct nfs4_state *state)
 851 {
 852         struct nfs4_exception exception = { };
 853         int err;
 854         do {
 855                 err = nfs4_handle_exception(server,
 856                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 857                                         state),
 858                                 &exception);
 859         } while (exception.retry);
 860         return err;
 861 }
 862
 863 struct nfs4_closedata {
 864         struct inode *inode;
 865         struct nfs4_state *state;
 866         struct nfs_closeargs arg;
 867         struct nfs_closeres res;
 868         struct nfs_fattr fattr;
 869 };
 870
 871 static void nfs4_free_closedata(struct nfs4_closedata *calldata)
 872 {
 873         struct nfs4_state *state = calldata->state;
 874         struct nfs4_state_owner *sp = state->owner;
 875
 876         nfs4_put_open_state(calldata->state);
 877         nfs_free_seqid(calldata->arg.seqid);
 878         nfs4_put_state_owner(sp);
 879         kfree(calldata);
 880 }
 881
 882 static void nfs4_close_done(struct rpc_task *task)
 883 {
 884         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 885         struct nfs4_state *state = calldata->state;
 886         struct nfs_server *server = NFS_SERVER(calldata->inode);
 887
 888         /* hmm. we are done with the inode, and in the process of freeing
 889          * the state_owner. we keep this around to process errors
 890          */
 891         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 892         switch (task->tk_status) {
 893                 case 0:
 894                         memcpy(&state->stateid, &calldata->res.stateid,
 895                                         sizeof(state->stateid));
 896                         break;
 897                 case -NFS4ERR_STALE_STATEID:
 898                 case -NFS4ERR_EXPIRED:
 899                         state->state = calldata->arg.open_flags;
 900                         nfs4_schedule_state_recovery(server->nfs4_state);
 901                         break;
 902                 default:
 903                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 904                                 rpc_restart_call(task);
 905                                 return;
 906                         }
 907         }
 908         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
 909         state->state = calldata->arg.open_flags;
 910         nfs4_free_closedata(calldata);
 911 }
 912
 913 static void nfs4_close_begin(struct rpc_task *task)
 914 {
 915         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 916         struct nfs4_state *state = calldata->state;
 917         struct rpc_message msg = {
 918                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 919                 .rpc_argp = &calldata->arg,
 920                 .rpc_resp = &calldata->res,
 921                 .rpc_cred = state->owner->so_cred,
 922         };
 923         int mode = 0;
 924         int status;
 925
 926         status = nfs_wait_on_sequence(calldata->arg.seqid, task);
 927         if (status != 0)
 928                 return;
 929         /* Don't reorder reads */
 930         smp_rmb();
 931         /* Recalculate the new open mode in case someone reopened the file
 932          * while we were waiting in line to be scheduled.
 933          */
 934         if (state->nreaders != 0)
 935                 mode |= FMODE_READ;
 936         if (state->nwriters != 0)
 937                 mode |= FMODE_WRITE;
 938         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
 939                 state->state = mode;
 940         if (mode == state->state) {
 941                 nfs4_free_closedata(calldata);
 942                 task->tk_exit = NULL;
 943                 rpc_exit(task, 0);
 944                 return;
 945         }
 946         nfs_fattr_init(calldata->res.fattr);
 947         if (mode != 0)
 948                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 949         calldata->arg.open_flags = mode;
 950         rpc_call_setup(task, &msg, 0);
 951 }
 952
 953 /*
 954  * It is possible for data to be read/written from a mem-mapped file
 955  * after the sys_close call (which hits the vfs layer as a flush).
 956  * This means that we can't safely call nfsv4 close on a file until
 957  * the inode is cleared. This in turn means that we are not good
 958  * NFSv4 citizens - we do not indicate to the server to update the file's
 959  * share state even when we are done with one of the three share
 960  * stateid's in the inode.
 961  *
 962  * NOTE: Caller must be holding the sp->so_owner semaphore!
 963  */
 964 int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
 965 {
 966         struct nfs_server *server = NFS_SERVER(inode);
 967         struct nfs4_closedata *calldata;
 968         int status = -ENOMEM;
 969
 970         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 971         if (calldata == NULL)
 972                 goto out;
 973         calldata->inode = inode;
 974         calldata->state = state;
 975         calldata->arg.fh = NFS_FH(inode);
 976         calldata->arg.stateid = &state->stateid;
 977         /* Serialization for the sequence id */
 978         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 979         if (calldata->arg.seqid == NULL)
 980                 goto out_free_calldata;
 981         calldata->arg.bitmask = server->attr_bitmask;
 982         calldata->res.fattr = &calldata->fattr;
 983         calldata->res.server = server;
 984
 985         status = nfs4_call_async(server->client, nfs4_close_begin,
 986                         nfs4_close_done, calldata);
 987         if (status == 0)
 988                 goto out;
 989
 990         nfs_free_seqid(calldata->arg.seqid);
 991 out_free_calldata:
 992         kfree(calldata);
 993 out:
 994         return status;
 995 }
 996
 997 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
 998 {
 999         struct file *filp;
1000
1001         filp = lookup_instantiate_filp(nd, dentry, NULL);
1002         if (!IS_ERR(filp)) {
1003                 struct nfs_open_context *ctx;
1004                 ctx = (struct nfs_open_context *)filp->private_data;
1005                 ctx->state = state;
1006         } else
1007                 nfs4_close_state(state, nd->intent.open.flags);
1008 }
1009
1010 struct dentry *
1011 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1012 {
1013         struct iattr attr;
1014         struct rpc_cred *cred;
1015         struct nfs4_state *state;
1016         struct dentry *res;
1017
1018         if (nd->flags & LOOKUP_CREATE) {
1019                 attr.ia_mode = nd->intent.open.create_mode;
1020                 attr.ia_valid = ATTR_MODE;
1021                 if (!IS_POSIXACL(dir))
1022                         attr.ia_mode &= ~current->fs->umask;
1023         } else {
1024                 attr.ia_valid = 0;
1025                 BUG_ON(nd->intent.open.flags & O_CREAT);
1026         }
1027
1028         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1029         if (IS_ERR(cred))
1030                 return (struct dentry *)cred;
1031         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1032         put_rpccred(cred);
1033         if (IS_ERR(state)) {
1034                 if (PTR_ERR(state) == -ENOENT)
1035                         d_add(dentry, NULL);
1036                 return (struct dentry *)state;
1037         }
1038         res = d_add_unique(dentry, state->inode);
1039         if (res != NULL)
1040                 dentry = res;
1041         nfs4_intent_set_file(nd, dentry, state);
1042         return res;
1043 }
1044
1045 int
1046 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1047 {
1048         struct rpc_cred *cred;
1049         struct nfs4_state *state;
1050         struct inode *inode;
1051
1052         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1053         if (IS_ERR(cred))
1054                 return PTR_ERR(cred);
1055         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1056         if (IS_ERR(state))
1057                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1058         put_rpccred(cred);
1059         if (IS_ERR(state)) {
1060                 switch (PTR_ERR(state)) {
1061                         case -EPERM:
1062                         case -EACCES:
1063                         case -EDQUOT:
1064                         case -ENOSPC:
1065                         case -EROFS:
1066                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1067                                 return 1;
1068                         case -ENOENT:
1069                                 if (dentry->d_inode == NULL)
1070                                         return 1;
1071                 }
1072                 goto out_drop;
1073         }
1074         inode = state->inode;
1075         iput(inode);
1076         if (inode == dentry->d_inode) {
1077                 nfs4_intent_set_file(nd, dentry, state);
1078                 return 1;
1079         }
1080         nfs4_close_state(state, openflags);
1081 out_drop:
1082         d_drop(dentry);
1083         return 0;
1084 }
1085
1086
1087 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1088 {
1089         struct nfs4_server_caps_res res = {};
1090         struct rpc_message msg = {
1091                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1092                 .rpc_argp = fhandle,
1093                 .rpc_resp = &res,
1094         };
1095         int status;
1096
1097         status = rpc_call_sync(server->client, &msg, 0);
1098         if (status == 0) {
1099                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1100                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1101                         server->caps |= NFS_CAP_ACLS;
1102                 if (res.has_links != 0)
1103                         server->caps |= NFS_CAP_HARDLINKS;
1104                 if (res.has_symlinks != 0)
1105                         server->caps |= NFS_CAP_SYMLINKS;
1106                 server->acl_bitmask = res.acl_bitmask;
1107         }
1108         return status;
1109 }
1110
1111 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1112 {
1113         struct nfs4_exception exception = { };
1114         int err;
1115         do {
1116                 err = nfs4_handle_exception(server,
1117                                 _nfs4_server_capabilities(server, fhandle),
1118                                 &exception);
1119         } while (exception.retry);
1120         return err;
1121 }
1122
1123 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1124                 struct nfs_fsinfo *info)
1125 {
1126         struct nfs4_lookup_root_arg args = {
1127                 .bitmask = nfs4_fattr_bitmap,
1128         };
1129         struct nfs4_lookup_res res = {
1130                 .server = server,
1131                 .fattr = info->fattr,
1132                 .fh = fhandle,
1133         };
1134         struct rpc_message msg = {
1135                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1136                 .rpc_argp = &args,
1137                 .rpc_resp = &res,
1138         };
1139         nfs_fattr_init(info->fattr);
1140         return rpc_call_sync(server->client, &msg, 0);
1141 }
1142
1143 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1144                 struct nfs_fsinfo *info)
1145 {
1146         struct nfs4_exception exception = { };
1147         int err;
1148         do {
1149                 err = nfs4_handle_exception(server,
1150                                 _nfs4_lookup_root(server, fhandle, info),
1151                                 &exception);
1152         } while (exception.retry);
1153         return err;
1154 }
1155
1156 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1157                 struct nfs_fsinfo *info)
1158 {
1159         struct nfs_fattr *      fattr = info->fattr;
1160         unsigned char *         p;
1161         struct qstr             q;
1162         struct nfs4_lookup_arg args = {
1163                 .dir_fh = fhandle,
1164                 .name = &q,
1165                 .bitmask = nfs4_fattr_bitmap,
1166         };
1167         struct nfs4_lookup_res res = {
1168                 .server = server,
1169                 .fattr = fattr,
1170                 .fh = fhandle,
1171         };
1172         struct rpc_message msg = {
1173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1174                 .rpc_argp = &args,
1175                 .rpc_resp = &res,
1176         };
1177         int status;
1178
1179         /*
1180          * Now we do a separate LOOKUP for each component of the mount path.
1181          * The LOOKUPs are done separately so that we can conveniently
1182          * catch an ERR_WRONGSEC if it occurs along the way...
1183          */
1184         status = nfs4_lookup_root(server, fhandle, info);
1185         if (status)
1186                 goto out;
1187
1188         p = server->mnt_path;
1189         for (;;) {
1190                 struct nfs4_exception exception = { };
1191
1192                 while (*p == '/')
1193                         p++;
1194                 if (!*p)
1195                         break;
1196                 q.name = p;
1197                 while (*p && (*p != '/'))
1198                         p++;
1199                 q.len = p - q.name;
1200
1201                 do {
1202                         nfs_fattr_init(fattr);
1203                         status = nfs4_handle_exception(server,
1204                                         rpc_call_sync(server->client, &msg, 0),
1205                                         &exception);
1206                 } while (exception.retry);
1207                 if (status == 0)
1208                         continue;
1209                 if (status == -ENOENT) {
1210                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1211                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1212                 }
1213                 break;
1214         }
1215         if (status == 0)
1216                 status = nfs4_server_capabilities(server, fhandle);
1217         if (status == 0)
1218                 status = nfs4_do_fsinfo(server, fhandle, info);
1219 out:
1220         return status;
1221 }
1222
1223 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1224 {
1225         struct nfs4_getattr_arg args = {
1226                 .fh = fhandle,
1227                 .bitmask = server->attr_bitmask,
1228         };
1229         struct nfs4_getattr_res res = {
1230                 .fattr = fattr,
1231                 .server = server,
1232         };
1233         struct rpc_message msg = {
1234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1235                 .rpc_argp = &args,
1236                 .rpc_resp = &res,
1237         };
1238
1239         nfs_fattr_init(fattr);
1240         return rpc_call_sync(server->client, &msg, 0);
1241 }
1242
1243 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1244 {
1245         struct nfs4_exception exception = { };
1246         int err;
1247         do {
1248                 err = nfs4_handle_exception(server,
1249                                 _nfs4_proc_getattr(server, fhandle, fattr),
1250                                 &exception);
1251         } while (exception.retry);
1252         return err;
1253 }
1254
1255 /*
1256  * The file is not closed if it is opened due to the a request to change
1257  * the size of the file. The open call will not be needed once the
1258  * VFS layer lookup-intents are implemented.
1259  *
1260  * Close is called when the inode is destroyed.
1261  * If we haven't opened the file for O_WRONLY, we
1262  * need to in the size_change case to obtain a stateid.
1263  *
1264  * Got race?
1265  * Because OPEN is always done by name in nfsv4, it is
1266  * possible that we opened a different file by the same
1267  * name.  We can recognize this race condition, but we
1268  * can't do anything about it besides returning an error.
1269  *
1270  * This will be fixed with VFS changes (lookup-intent).
1271  */
1272 static int
1273 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1274                   struct iattr *sattr)
1275 {
1276         struct rpc_cred *cred;
1277         struct inode *inode = dentry->d_inode;
1278         struct nfs4_state *state;
1279         int status;
1280
1281         nfs_fattr_init(fattr);
1282
1283         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1284         if (IS_ERR(cred))
1285                 return PTR_ERR(cred);
1286         /* Search for an existing WRITE delegation first */
1287         state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1288         if (!IS_ERR(state)) {
1289                 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1290                 iput(inode);
1291         } else {
1292                 /* Search for an existing open(O_WRITE) stateid */
1293                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1294         }
1295
1296         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1297                         NFS_FH(inode), sattr, state);
1298         if (status == 0)
1299                 nfs_setattr_update_inode(inode, sattr);
1300         if (state != NULL)
1301                 nfs4_close_state(state, FMODE_WRITE);
1302         put_rpccred(cred);
1303         return status;
1304 }
1305
1306 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1307                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1308 {
1309         int                    status;
1310         struct nfs_server *server = NFS_SERVER(dir);
1311         struct nfs4_lookup_arg args = {
1312                 .bitmask = server->attr_bitmask,
1313                 .dir_fh = NFS_FH(dir),
1314                 .name = name,
1315         };
1316         struct nfs4_lookup_res res = {
1317                 .server = server,
1318                 .fattr = fattr,
1319                 .fh = fhandle,
1320         };
1321         struct rpc_message msg = {
1322                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1323                 .rpc_argp = &args,
1324                 .rpc_resp = &res,
1325         };
1326
1327         nfs_fattr_init(fattr);
1328
1329         dprintk("NFS call  lookup %s\n", name->name);
1330         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1331         dprintk("NFS reply lookup: %d\n", status);
1332         return status;
1333 }
1334
1335 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1336 {
1337         struct nfs4_exception exception = { };
1338         int err;
1339         do {
1340                 err = nfs4_handle_exception(NFS_SERVER(dir),
1341                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1342                                 &exception);
1343         } while (exception.retry);
1344         return err;
1345 }
1346
1347 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1348 {
1349         struct nfs4_accessargs args = {
1350                 .fh = NFS_FH(inode),
1351         };
1352         struct nfs4_accessres res = { 0 };
1353         struct rpc_message msg = {
1354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1355                 .rpc_argp = &args,
1356                 .rpc_resp = &res,
1357                 .rpc_cred = entry->cred,
1358         };
1359         int mode = entry->mask;
1360         int status;
1361
1362         /*
1363          * Determine which access bits we want to ask for...
1364          */
1365         if (mode & MAY_READ)
1366                 args.access |= NFS4_ACCESS_READ;
1367         if (S_ISDIR(inode->i_mode)) {
1368                 if (mode & MAY_WRITE)
1369                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1370                 if (mode & MAY_EXEC)
1371                         args.access |= NFS4_ACCESS_LOOKUP;
1372         } else {
1373                 if (mode & MAY_WRITE)
1374                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1375                 if (mode & MAY_EXEC)
1376                         args.access |= NFS4_ACCESS_EXECUTE;
1377         }
1378         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1379         if (!status) {
1380                 entry->mask = 0;
1381                 if (res.access & NFS4_ACCESS_READ)
1382                         entry->mask |= MAY_READ;
1383                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1384                         entry->mask |= MAY_WRITE;
1385                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1386                         entry->mask |= MAY_EXEC;
1387         }
1388         return status;
1389 }
1390
1391 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1392 {
1393         struct nfs4_exception exception = { };
1394         int err;
1395         do {
1396                 err = nfs4_handle_exception(NFS_SERVER(inode),
1397                                 _nfs4_proc_access(inode, entry),
1398                                 &exception);
1399         } while (exception.retry);
1400         return err;
1401 }
1402
1403 /*
1404  * TODO: For the time being, we don't try to get any attributes
1405  * along with any of the zero-copy operations READ, READDIR,
1406  * READLINK, WRITE.
1407  *
1408  * In the case of the first three, we want to put the GETATTR
1409  * after the read-type operation -- this is because it is hard
1410  * to predict the length of a GETATTR response in v4, and thus
1411  * align the READ data correctly.  This means that the GETATTR
1412  * may end up partially falling into the page cache, and we should
1413  * shift it into the 'tail' of the xdr_buf before processing.
1414  * To do this efficiently, we need to know the total length
1415  * of data received, which doesn't seem to be available outside
1416  * of the RPC layer.
1417  *
1418  * In the case of WRITE, we also want to put the GETATTR after
1419  * the operation -- in this case because we want to make sure
1420  * we get the post-operation mtime and size.  This means that
1421  * we can't use xdr_encode_pages() as written: we need a variant
1422  * of it which would leave room in the 'tail' iovec.
1423  *
1424  * Both of these changes to the XDR layer would in fact be quite
1425  * minor, but I decided to leave them for a subsequent patch.
1426  */
1427 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1428                 unsigned int pgbase, unsigned int pglen)
1429 {
1430         struct nfs4_readlink args = {
1431                 .fh       = NFS_FH(inode),
1432                 .pgbase   = pgbase,
1433                 .pglen    = pglen,
1434                 .pages    = &page,
1435         };
1436         struct rpc_message msg = {
1437                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1438                 .rpc_argp = &args,
1439                 .rpc_resp = NULL,
1440         };
1441
1442         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1443 }
1444
1445 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1446                 unsigned int pgbase, unsigned int pglen)
1447 {
1448         struct nfs4_exception exception = { };
1449         int err;
1450         do {
1451                 err = nfs4_handle_exception(NFS_SERVER(inode),
1452                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1453                                 &exception);
1454         } while (exception.retry);
1455         return err;
1456 }
1457
1458 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1459 {
1460         int flags = rdata->flags;
1461         struct inode *inode = rdata->inode;
1462         struct nfs_fattr *fattr = rdata->res.fattr;
1463         struct nfs_server *server = NFS_SERVER(inode);
1464         struct rpc_message msg = {
1465                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1466                 .rpc_argp       = &rdata->args,
1467                 .rpc_resp       = &rdata->res,
1468                 .rpc_cred       = rdata->cred,
1469         };
1470         unsigned long timestamp = jiffies;
1471         int status;
1472
1473         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1474                         (long long) rdata->args.offset);
1475
1476         nfs_fattr_init(fattr);
1477         status = rpc_call_sync(server->client, &msg, flags);
1478         if (!status)
1479                 renew_lease(server, timestamp);
1480         dprintk("NFS reply read: %d\n", status);
1481         return status;
1482 }
1483
1484 static int nfs4_proc_read(struct nfs_read_data *rdata)
1485 {
1486         struct nfs4_exception exception = { };
1487         int err;
1488         do {
1489                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1490                                 _nfs4_proc_read(rdata),
1491                                 &exception);
1492         } while (exception.retry);
1493         return err;
1494 }
1495
1496 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1497 {
1498         int rpcflags = wdata->flags;
1499         struct inode *inode = wdata->inode;
1500         struct nfs_fattr *fattr = wdata->res.fattr;
1501         struct nfs_server *server = NFS_SERVER(inode);
1502         struct rpc_message msg = {
1503                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1504                 .rpc_argp       = &wdata->args,
1505                 .rpc_resp       = &wdata->res,
1506                 .rpc_cred       = wdata->cred,
1507         };
1508         int status;
1509
1510         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1511                         (long long) wdata->args.offset);
1512
1513         nfs_fattr_init(fattr);
1514         status = rpc_call_sync(server->client, &msg, rpcflags);
1515         dprintk("NFS reply write: %d\n", status);
1516         return status;
1517 }
1518
1519 static int nfs4_proc_write(struct nfs_write_data *wdata)
1520 {
1521         struct nfs4_exception exception = { };
1522         int err;
1523         do {
1524                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1525                                 _nfs4_proc_write(wdata),
1526                                 &exception);
1527         } while (exception.retry);
1528         return err;
1529 }
1530
1531 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1532 {
1533         struct inode *inode = cdata->inode;
1534         struct nfs_fattr *fattr = cdata->res.fattr;
1535         struct nfs_server *server = NFS_SERVER(inode);
1536         struct rpc_message msg = {
1537                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1538                 .rpc_argp       = &cdata->args,
1539                 .rpc_resp       = &cdata->res,
1540                 .rpc_cred       = cdata->cred,
1541         };
1542         int status;
1543
1544         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1545                         (long long) cdata->args.offset);
1546
1547         nfs_fattr_init(fattr);
1548         status = rpc_call_sync(server->client, &msg, 0);
1549         dprintk("NFS reply commit: %d\n", status);
1550         return status;
1551 }
1552
1553 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1554 {
1555         struct nfs4_exception exception = { };
1556         int err;
1557         do {
1558                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1559                                 _nfs4_proc_commit(cdata),
1560                                 &exception);
1561         } while (exception.retry);
1562         return err;
1563 }
1564
1565 /*
1566  * Got race?
1567  * We will need to arrange for the VFS layer to provide an atomic open.
1568  * Until then, this create/open method is prone to inefficiency and race
1569  * conditions due to the lookup, create, and open VFS calls from sys_open()
1570  * placed on the wire.
1571  *
1572  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1573  * The file will be opened again in the subsequent VFS open call
1574  * (nfs4_proc_file_open).
1575  *
1576  * The open for read will just hang around to be used by any process that
1577  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1578  */
1579
1580 static int
1581 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1582                  int flags, struct nameidata *nd)
1583 {
1584         struct nfs4_state *state;
1585         struct rpc_cred *cred;
1586         int status = 0;
1587
1588         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1589         if (IS_ERR(cred)) {
1590                 status = PTR_ERR(cred);
1591                 goto out;
1592         }
1593         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1594         put_rpccred(cred);
1595         if (IS_ERR(state)) {
1596                 status = PTR_ERR(state);
1597                 goto out;
1598         }
1599         d_instantiate(dentry, state->inode);
1600         if (flags & O_EXCL) {
1601                 struct nfs_fattr fattr;
1602                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1603                                      NFS_FH(state->inode), sattr, state);
1604                 if (status == 0)
1605                         nfs_setattr_update_inode(state->inode, sattr);
1606         }
1607         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1608                 nfs4_intent_set_file(nd, dentry, state);
1609         else
1610                 nfs4_close_state(state, flags);
1611 out:
1612         return status;
1613 }
1614
1615 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1616 {
1617         struct nfs4_remove_arg args = {
1618                 .fh = NFS_FH(dir),
1619                 .name = name,
1620         };
1621         struct nfs4_change_info res;
1622         struct rpc_message msg = {
1623                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1624                 .rpc_argp       = &args,
1625                 .rpc_resp       = &res,
1626         };
1627         int                     status;
1628
1629         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1630         if (status == 0)
1631                 update_changeattr(dir, &res);
1632         return status;
1633 }
1634
1635 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1636 {
1637         struct nfs4_exception exception = { };
1638         int err;
1639         do {
1640                 err = nfs4_handle_exception(NFS_SERVER(dir),
1641                                 _nfs4_proc_remove(dir, name),
1642                                 &exception);
1643         } while (exception.retry);
1644         return err;
1645 }
1646
1647 struct unlink_desc {
1648         struct nfs4_remove_arg  args;
1649         struct nfs4_change_info res;
1650 };
1651
1652 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1653                 struct qstr *name)
1654 {
1655         struct unlink_desc *up;
1656
1657         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1658         if (!up)
1659                 return -ENOMEM;
1660
1661         up->args.fh = NFS_FH(dir->d_inode);
1662         up->args.name = name;
1663
1664         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1665         msg->rpc_argp = &up->args;
1666         msg->rpc_resp = &up->res;
1667         return 0;
1668 }
1669
1670 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1671 {
1672         struct rpc_message *msg = &task->tk_msg;
1673         struct unlink_desc *up;
1674
1675         if (msg->rpc_resp != NULL) {
1676                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1677                 update_changeattr(dir->d_inode, &up->res);
1678                 kfree(up);
1679                 msg->rpc_resp = NULL;
1680                 msg->rpc_argp = NULL;
1681         }
1682         return 0;
1683 }
1684
1685 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1686                 struct inode *new_dir, struct qstr *new_name)
1687 {
1688         struct nfs4_rename_arg arg = {
1689                 .old_dir = NFS_FH(old_dir),
1690                 .new_dir = NFS_FH(new_dir),
1691                 .old_name = old_name,
1692                 .new_name = new_name,
1693         };
1694         struct nfs4_rename_res res = { };
1695         struct rpc_message msg = {
1696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1697                 .rpc_argp = &arg,
1698                 .rpc_resp = &res,
1699         };
1700         int                     status;
1701
1702         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1703
1704         if (!status) {
1705                 update_changeattr(old_dir, &res.old_cinfo);
1706                 update_changeattr(new_dir, &res.new_cinfo);
1707         }
1708         return status;
1709 }
1710
1711 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1712                 struct inode *new_dir, struct qstr *new_name)
1713 {
1714         struct nfs4_exception exception = { };
1715         int err;
1716         do {
1717                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1718                                 _nfs4_proc_rename(old_dir, old_name,
1719                                         new_dir, new_name),
1720                                 &exception);
1721         } while (exception.retry);
1722         return err;
1723 }
1724
1725 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1726 {
1727         struct nfs4_link_arg arg = {
1728                 .fh     = NFS_FH(inode),
1729                 .dir_fh = NFS_FH(dir),
1730                 .name   = name,
1731         };
1732         struct nfs4_change_info cinfo = { };
1733         struct rpc_message msg = {
1734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1735                 .rpc_argp = &arg,
1736                 .rpc_resp = &cinfo,
1737         };
1738         int                     status;
1739
1740         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1741         if (!status)
1742                 update_changeattr(dir, &cinfo);
1743
1744         return status;
1745 }
1746
1747 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1748 {
1749         struct nfs4_exception exception = { };
1750         int err;
1751         do {
1752                 err = nfs4_handle_exception(NFS_SERVER(inode),
1753                                 _nfs4_proc_link(inode, dir, name),
1754                                 &exception);
1755         } while (exception.retry);
1756         return err;
1757 }
1758
1759 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1760                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1761                 struct nfs_fattr *fattr)
1762 {
1763         struct nfs_server *server = NFS_SERVER(dir);
1764         struct nfs_fattr dir_fattr;
1765         struct nfs4_create_arg arg = {
1766                 .dir_fh = NFS_FH(dir),
1767                 .server = server,
1768                 .name = name,
1769                 .attrs = sattr,
1770                 .ftype = NF4LNK,
1771                 .bitmask = server->attr_bitmask,
1772         };
1773         struct nfs4_create_res res = {
1774                 .server = server,
1775                 .fh = fhandle,
1776                 .fattr = fattr,
1777                 .dir_fattr = &dir_fattr,
1778         };
1779         struct rpc_message msg = {
1780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1781                 .rpc_argp = &arg,
1782                 .rpc_resp = &res,
1783         };
1784         int                     status;
1785
1786         if (path->len > NFS4_MAXPATHLEN)
1787                 return -ENAMETOOLONG;
1788         arg.u.symlink = path;
1789         nfs_fattr_init(fattr);
1790         nfs_fattr_init(&dir_fattr);
1791
1792         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1793         if (!status)
1794                 update_changeattr(dir, &res.dir_cinfo);
1795         nfs_post_op_update_inode(dir, res.dir_fattr);
1796         return status;
1797 }
1798
1799 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1800                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1801                 struct nfs_fattr *fattr)
1802 {
1803         struct nfs4_exception exception = { };
1804         int err;
1805         do {
1806                 err = nfs4_handle_exception(NFS_SERVER(dir),
1807                                 _nfs4_proc_symlink(dir, name, path, sattr,
1808                                         fhandle, fattr),
1809                                 &exception);
1810         } while (exception.retry);
1811         return err;
1812 }
1813
1814 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1815                 struct iattr *sattr)
1816 {
1817         struct nfs_server *server = NFS_SERVER(dir);
1818         struct nfs_fh fhandle;
1819         struct nfs_fattr fattr, dir_fattr;
1820         struct nfs4_create_arg arg = {
1821                 .dir_fh = NFS_FH(dir),
1822                 .server = server,
1823                 .name = &dentry->d_name,
1824                 .attrs = sattr,
1825                 .ftype = NF4DIR,
1826                 .bitmask = server->attr_bitmask,
1827         };
1828         struct nfs4_create_res res = {
1829                 .server = server,
1830                 .fh = &fhandle,
1831                 .fattr = &fattr,
1832                 .dir_fattr = &dir_fattr,
1833         };
1834         struct rpc_message msg = {
1835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1836                 .rpc_argp = &arg,
1837                 .rpc_resp = &res,
1838         };
1839         int                     status;
1840
1841         nfs_fattr_init(&fattr);
1842         nfs_fattr_init(&dir_fattr);
1843
1844         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1845         if (!status) {
1846                 update_changeattr(dir, &res.dir_cinfo);
1847                 nfs_post_op_update_inode(dir, res.dir_fattr);
1848                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1849         }
1850         return status;
1851 }
1852
1853 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1854                 struct iattr *sattr)
1855 {
1856         struct nfs4_exception exception = { };
1857         int err;
1858         do {
1859                 err = nfs4_handle_exception(NFS_SERVER(dir),
1860                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1861                                 &exception);
1862         } while (exception.retry);
1863         return err;
1864 }
1865
1866 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1867                   u64 cookie, struct page *page, unsigned int count, int plus)
1868 {
1869         struct inode            *dir = dentry->d_inode;
1870         struct nfs4_readdir_arg args = {
1871                 .fh = NFS_FH(dir),
1872                 .pages = &page,
1873                 .pgbase = 0,
1874                 .count = count,
1875                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1876         };
1877         struct nfs4_readdir_res res;
1878         struct rpc_message msg = {
1879                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1880                 .rpc_argp = &args,
1881                 .rpc_resp = &res,
1882                 .rpc_cred = cred,
1883         };
1884         int                     status;
1885
1886         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1887                         dentry->d_parent->d_name.name,
1888                         dentry->d_name.name,
1889                         (unsigned long long)cookie);
1890         lock_kernel();
1891         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1892         res.pgbase = args.pgbase;
1893         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1894         if (status == 0)
1895                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1896         unlock_kernel();
1897         dprintk("%s: returns %d\n", __FUNCTION__, status);
1898         return status;
1899 }
1900
1901 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1902                   u64 cookie, struct page *page, unsigned int count, int plus)
1903 {
1904         struct nfs4_exception exception = { };
1905         int err;
1906         do {
1907                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1908                                 _nfs4_proc_readdir(dentry, cred, cookie,
1909                                         page, count, plus),
1910                                 &exception);
1911         } while (exception.retry);
1912         return err;
1913 }
1914
1915 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1916                 struct iattr *sattr, dev_t rdev)
1917 {
1918         struct nfs_server *server = NFS_SERVER(dir);
1919         struct nfs_fh fh;
1920         struct nfs_fattr fattr, dir_fattr;
1921         struct nfs4_create_arg arg = {
1922                 .dir_fh = NFS_FH(dir),
1923                 .server = server,
1924                 .name = &dentry->d_name,
1925                 .attrs = sattr,
1926                 .bitmask = server->attr_bitmask,
1927         };
1928         struct nfs4_create_res res = {
1929                 .server = server,
1930                 .fh = &fh,
1931                 .fattr = &fattr,
1932                 .dir_fattr = &dir_fattr,
1933         };
1934         struct rpc_message msg = {
1935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1936                 .rpc_argp = &arg,
1937                 .rpc_resp = &res,
1938         };
1939         int                     status;
1940         int                     mode = sattr->ia_mode;
1941
1942         nfs_fattr_init(&fattr);
1943         nfs_fattr_init(&dir_fattr);
1944
1945         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1946         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1947         if (S_ISFIFO(mode))
1948                 arg.ftype = NF4FIFO;
1949         else if (S_ISBLK(mode)) {
1950                 arg.ftype = NF4BLK;
1951                 arg.u.device.specdata1 = MAJOR(rdev);
1952                 arg.u.device.specdata2 = MINOR(rdev);
1953         }
1954         else if (S_ISCHR(mode)) {
1955                 arg.ftype = NF4CHR;
1956                 arg.u.device.specdata1 = MAJOR(rdev);
1957                 arg.u.device.specdata2 = MINOR(rdev);
1958         }
1959         else
1960                 arg.ftype = NF4SOCK;
1961
1962         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1963         if (status == 0) {
1964                 update_changeattr(dir, &res.dir_cinfo);
1965                 nfs_post_op_update_inode(dir, res.dir_fattr);
1966                 status = nfs_instantiate(dentry, &fh, &fattr);
1967         }
1968         return status;
1969 }
1970
1971 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1972                 struct iattr *sattr, dev_t rdev)
1973 {
1974         struct nfs4_exception exception = { };
1975         int err;
1976         do {
1977                 err = nfs4_handle_exception(NFS_SERVER(dir),
1978                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1979                                 &exception);
1980         } while (exception.retry);
1981         return err;
1982 }
1983
1984 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1985                  struct nfs_fsstat *fsstat)
1986 {
1987         struct nfs4_statfs_arg args = {
1988                 .fh = fhandle,
1989                 .bitmask = server->attr_bitmask,
1990         };
1991         struct rpc_message msg = {
1992                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1993                 .rpc_argp = &args,
1994                 .rpc_resp = fsstat,
1995         };
1996
1997         nfs_fattr_init(fsstat->fattr);
1998         return rpc_call_sync(server->client, &msg, 0);
1999 }
2000
2001 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2002 {
2003         struct nfs4_exception exception = { };
2004         int err;
2005         do {
2006                 err = nfs4_handle_exception(server,
2007                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2008                                 &exception);
2009         } while (exception.retry);
2010         return err;
2011 }
2012
2013 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2014                 struct nfs_fsinfo *fsinfo)
2015 {
2016         struct nfs4_fsinfo_arg args = {
2017                 .fh = fhandle,
2018                 .bitmask = server->attr_bitmask,
2019         };
2020         struct rpc_message msg = {
2021                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2022                 .rpc_argp = &args,
2023                 .rpc_resp = fsinfo,
2024         };
2025
2026         return rpc_call_sync(server->client, &msg, 0);
2027 }
2028
2029 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2030 {
2031         struct nfs4_exception exception = { };
2032         int err;
2033
2034         do {
2035                 err = nfs4_handle_exception(server,
2036                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2037                                 &exception);
2038         } while (exception.retry);
2039         return err;
2040 }
2041
2042 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2043 {
2044         nfs_fattr_init(fsinfo->fattr);
2045         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2046 }
2047
2048 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2049                 struct nfs_pathconf *pathconf)
2050 {
2051         struct nfs4_pathconf_arg args = {
2052                 .fh = fhandle,
2053                 .bitmask = server->attr_bitmask,
2054         };
2055         struct rpc_message msg = {
2056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2057                 .rpc_argp = &args,
2058                 .rpc_resp = pathconf,
2059         };
2060
2061         /* None of the pathconf attributes are mandatory to implement */
2062         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2063                 memset(pathconf, 0, sizeof(*pathconf));
2064                 return 0;
2065         }
2066
2067         nfs_fattr_init(pathconf->fattr);
2068         return rpc_call_sync(server->client, &msg, 0);
2069 }
2070
2071 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2072                 struct nfs_pathconf *pathconf)
2073 {
2074         struct nfs4_exception exception = { };
2075         int err;
2076
2077         do {
2078                 err = nfs4_handle_exception(server,
2079                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2080                                 &exception);
2081         } while (exception.retry);
2082         return err;
2083 }
2084
2085 static void
2086 nfs4_read_done(struct rpc_task *task)
2087 {
2088         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2089         struct inode *inode = data->inode;
2090
2091         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2092                 rpc_restart_call(task);
2093                 return;
2094         }
2095         if (task->tk_status > 0)
2096                 renew_lease(NFS_SERVER(inode), data->timestamp);
2097         /* Call back common NFS readpage processing */
2098         nfs_readpage_result(task);
2099 }
2100
2101 static void
2102 nfs4_proc_read_setup(struct nfs_read_data *data)
2103 {
2104         struct rpc_task *task = &data->task;
2105         struct rpc_message msg = {
2106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2107                 .rpc_argp = &data->args,
2108                 .rpc_resp = &data->res,
2109                 .rpc_cred = data->cred,
2110         };
2111         struct inode *inode = data->inode;
2112         int flags;
2113
2114         data->timestamp   = jiffies;
2115
2116         /* N.B. Do we need to test? Never called for swapfile inode */
2117         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2118
2119         /* Finalize the task. */
2120         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2121         rpc_call_setup(task, &msg, 0);
2122 }
2123
2124 static void
2125 nfs4_write_done(struct rpc_task *task)
2126 {
2127         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2128         struct inode *inode = data->inode;
2129
2130         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2131                 rpc_restart_call(task);
2132                 return;
2133         }
2134         if (task->tk_status >= 0)
2135                 renew_lease(NFS_SERVER(inode), data->timestamp);
2136         /* Call back common NFS writeback processing */
2137         nfs_writeback_done(task);
2138 }
2139
2140 static void
2141 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2142 {
2143         struct rpc_task *task = &data->task;
2144         struct rpc_message msg = {
2145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2146                 .rpc_argp = &data->args,
2147                 .rpc_resp = &data->res,
2148                 .rpc_cred = data->cred,
2149         };
2150         struct inode *inode = data->inode;
2151         int stable;
2152         int flags;
2153
2154         if (how & FLUSH_STABLE) {
2155                 if (!NFS_I(inode)->ncommit)
2156                         stable = NFS_FILE_SYNC;
2157                 else
2158                         stable = NFS_DATA_SYNC;
2159         } else
2160                 stable = NFS_UNSTABLE;
2161         data->args.stable = stable;
2162
2163         data->timestamp   = jiffies;
2164
2165         /* Set the initial flags for the task.  */
2166         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2167
2168         /* Finalize the task. */
2169         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2170         rpc_call_setup(task, &msg, 0);
2171 }
2172
2173 static void
2174 nfs4_commit_done(struct rpc_task *task)
2175 {
2176         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2177         struct inode *inode = data->inode;
2178
2179         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2180                 rpc_restart_call(task);
2181                 return;
2182         }
2183         /* Call back common NFS writeback processing */
2184         nfs_commit_done(task);
2185 }
2186
2187 static void
2188 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2189 {
2190         struct rpc_task *task = &data->task;
2191         struct rpc_message msg = {
2192                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2193                 .rpc_argp = &data->args,
2194                 .rpc_resp = &data->res,
2195                 .rpc_cred = data->cred,
2196         };
2197         struct inode *inode = data->inode;
2198         int flags;
2199
2200         /* Set the initial flags for the task.  */
2201         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2202
2203         /* Finalize the task. */
2204         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2205         rpc_call_setup(task, &msg, 0);
2206 }
2207
2208 /*
2209  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2210  * standalone procedure for queueing an asynchronous RENEW.
2211  */
2212 static void
2213 renew_done(struct rpc_task *task)
2214 {
2215         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2216         unsigned long timestamp = (unsigned long)task->tk_calldata;
2217
2218         if (task->tk_status < 0) {
2219                 switch (task->tk_status) {
2220                         case -NFS4ERR_STALE_CLIENTID:
2221                         case -NFS4ERR_EXPIRED:
2222                         case -NFS4ERR_CB_PATH_DOWN:
2223                                 nfs4_schedule_state_recovery(clp);
2224                 }
2225                 return;
2226         }
2227         spin_lock(&clp->cl_lock);
2228         if (time_before(clp->cl_last_renewal,timestamp))
2229                 clp->cl_last_renewal = timestamp;
2230         spin_unlock(&clp->cl_lock);
2231 }
2232
2233 int
2234 nfs4_proc_async_renew(struct nfs4_client *clp)
2235 {
2236         struct rpc_message msg = {
2237                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2238                 .rpc_argp       = clp,
2239                 .rpc_cred       = clp->cl_cred,
2240         };
2241
2242         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2243                         renew_done, (void *)jiffies);
2244 }
2245
2246 int
2247 nfs4_proc_renew(struct nfs4_client *clp)
2248 {
2249         struct rpc_message msg = {
2250                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2251                 .rpc_argp       = clp,
2252                 .rpc_cred       = clp->cl_cred,
2253         };
2254         unsigned long now = jiffies;
2255         int status;
2256
2257         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2258         if (status < 0)
2259                 return status;
2260         spin_lock(&clp->cl_lock);
2261         if (time_before(clp->cl_last_renewal,now))
2262                 clp->cl_last_renewal = now;
2263         spin_unlock(&clp->cl_lock);
2264         return 0;
2265 }
2266
2267 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2268 {
2269         return (server->caps & NFS_CAP_ACLS)
2270                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2271                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2272 }
2273
2274 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2275  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2276  * the stack.
2277  */
2278 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2279
2280 static void buf_to_pages(const void *buf, size_t buflen,
2281                 struct page **pages, unsigned int *pgbase)
2282 {
2283         const void *p = buf;
2284
2285         *pgbase = offset_in_page(buf);
2286         p -= *pgbase;
2287         while (p < buf + buflen) {
2288                 *(pages++) = virt_to_page(p);
2289                 p += PAGE_CACHE_SIZE;
2290         }
2291 }
2292
2293 struct nfs4_cached_acl {
2294         int cached;
2295         size_t len;
2296         char data[0];
2297 };
2298
2299 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2300 {
2301         struct nfs_inode *nfsi = NFS_I(inode);
2302
2303         spin_lock(&inode->i_lock);
2304         kfree(nfsi->nfs4_acl);
2305         nfsi->nfs4_acl = acl;
2306         spin_unlock(&inode->i_lock);
2307 }
2308
2309 static void nfs4_zap_acl_attr(struct inode *inode)
2310 {
2311         nfs4_set_cached_acl(inode, NULL);
2312 }
2313
2314 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2315 {
2316         struct nfs_inode *nfsi = NFS_I(inode);
2317         struct nfs4_cached_acl *acl;
2318         int ret = -ENOENT;
2319
2320         spin_lock(&inode->i_lock);
2321         acl = nfsi->nfs4_acl;
2322         if (acl == NULL)
2323                 goto out;
2324         if (buf == NULL) /* user is just asking for length */
2325                 goto out_len;
2326         if (acl->cached == 0)
2327                 goto out;
2328         ret = -ERANGE; /* see getxattr(2) man page */
2329         if (acl->len > buflen)
2330                 goto out;
2331         memcpy(buf, acl->data, acl->len);
2332 out_len:
2333         ret = acl->len;
2334 out:
2335         spin_unlock(&inode->i_lock);
2336         return ret;
2337 }
2338
2339 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2340 {
2341         struct nfs4_cached_acl *acl;
2342
2343         if (buf && acl_len <= PAGE_SIZE) {
2344                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2345                 if (acl == NULL)
2346                         goto out;
2347                 acl->cached = 1;
2348                 memcpy(acl->data, buf, acl_len);
2349         } else {
2350                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2351                 if (acl == NULL)
2352                         goto out;
2353                 acl->cached = 0;
2354         }
2355         acl->len = acl_len;
2356 out:
2357         nfs4_set_cached_acl(inode, acl);
2358 }
2359
2360 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2361 {
2362         struct page *pages[NFS4ACL_MAXPAGES];
2363         struct nfs_getaclargs args = {
2364                 .fh = NFS_FH(inode),
2365                 .acl_pages = pages,
2366                 .acl_len = buflen,
2367         };
2368         size_t resp_len = buflen;
2369         void *resp_buf;
2370         struct rpc_message msg = {
2371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2372                 .rpc_argp = &args,
2373                 .rpc_resp = &resp_len,
2374         };
2375         struct page *localpage = NULL;
2376         int ret;
2377
2378         if (buflen < PAGE_SIZE) {
2379                 /* As long as we're doing a round trip to the server anyway,
2380                  * let's be prepared for a page of acl data. */
2381                 localpage = alloc_page(GFP_KERNEL);
2382                 resp_buf = page_address(localpage);
2383                 if (localpage == NULL)
2384                         return -ENOMEM;
2385                 args.acl_pages[0] = localpage;
2386                 args.acl_pgbase = 0;
2387                 resp_len = args.acl_len = PAGE_SIZE;
2388         } else {
2389                 resp_buf = buf;
2390                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2391         }
2392         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2393         if (ret)
2394                 goto out_free;
2395         if (resp_len > args.acl_len)
2396                 nfs4_write_cached_acl(inode, NULL, resp_len);
2397         else
2398                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2399         if (buf) {
2400                 ret = -ERANGE;
2401                 if (resp_len > buflen)
2402                         goto out_free;
2403                 if (localpage)
2404                         memcpy(buf, resp_buf, resp_len);
2405         }
2406         ret = resp_len;
2407 out_free:
2408         if (localpage)
2409                 __free_page(localpage);
2410         return ret;
2411 }
2412
2413 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2414 {
2415         struct nfs_server *server = NFS_SERVER(inode);
2416         int ret;
2417
2418         if (!nfs4_server_supports_acls(server))
2419                 return -EOPNOTSUPP;
2420         ret = nfs_revalidate_inode(server, inode);
2421         if (ret < 0)
2422                 return ret;
2423         ret = nfs4_read_cached_acl(inode, buf, buflen);
2424         if (ret != -ENOENT)
2425                 return ret;
2426         return nfs4_get_acl_uncached(inode, buf, buflen);
2427 }
2428
2429 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2430 {
2431         struct nfs_server *server = NFS_SERVER(inode);
2432         struct page *pages[NFS4ACL_MAXPAGES];
2433         struct nfs_setaclargs arg = {
2434                 .fh             = NFS_FH(inode),
2435                 .acl_pages      = pages,
2436                 .acl_len        = buflen,
2437         };
2438         struct rpc_message msg = {
2439                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2440                 .rpc_argp       = &arg,
2441                 .rpc_resp       = NULL,
2442         };
2443         int ret;
2444
2445         if (!nfs4_server_supports_acls(server))
2446                 return -EOPNOTSUPP;
2447         nfs_inode_return_delegation(inode);
2448         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2449         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2450         if (ret == 0)
2451                 nfs4_write_cached_acl(inode, buf, buflen);
2452         return ret;
2453 }
2454
2455 static int
2456 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2457 {
2458         struct nfs4_client *clp = server->nfs4_state;
2459
2460         if (!clp || task->tk_status >= 0)
2461                 return 0;
2462         switch(task->tk_status) {
2463                 case -NFS4ERR_STALE_CLIENTID:
2464                 case -NFS4ERR_STALE_STATEID:
2465                 case -NFS4ERR_EXPIRED:
2466                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2467                         nfs4_schedule_state_recovery(clp);
2468                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2469                                 rpc_wake_up_task(task);
2470                         task->tk_status = 0;
2471                         return -EAGAIN;
2472                 case -NFS4ERR_GRACE:
2473                 case -NFS4ERR_DELAY:
2474                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2475                         task->tk_status = 0;
2476                         return -EAGAIN;
2477                 case -NFS4ERR_OLD_STATEID:
2478                         task->tk_status = 0;
2479                         return -EAGAIN;
2480         }
2481         task->tk_status = nfs4_map_errors(task->tk_status);
2482         return 0;
2483 }
2484
2485 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2486 {
2487         DEFINE_WAIT(wait);
2488         sigset_t oldset;
2489         int interruptible, res = 0;
2490
2491         might_sleep();
2492
2493         rpc_clnt_sigmask(clnt, &oldset);
2494         interruptible = TASK_UNINTERRUPTIBLE;
2495         if (clnt->cl_intr)
2496                 interruptible = TASK_INTERRUPTIBLE;
2497         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2498         nfs4_schedule_state_recovery(clp);
2499         if (clnt->cl_intr && signalled())
2500                 res = -ERESTARTSYS;
2501         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2502                 schedule();
2503         finish_wait(&clp->cl_waitq, &wait);
2504         rpc_clnt_sigunmask(clnt, &oldset);
2505         return res;
2506 }
2507
2508 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2509 {
2510         sigset_t oldset;
2511         int res = 0;
2512
2513         might_sleep();
2514
2515         if (*timeout <= 0)
2516                 *timeout = NFS4_POLL_RETRY_MIN;
2517         if (*timeout > NFS4_POLL_RETRY_MAX)
2518                 *timeout = NFS4_POLL_RETRY_MAX;
2519         rpc_clnt_sigmask(clnt, &oldset);
2520         if (clnt->cl_intr) {
2521                 schedule_timeout_interruptible(*timeout);
2522                 if (signalled())
2523                         res = -ERESTARTSYS;
2524         } else
2525                 schedule_timeout_uninterruptible(*timeout);
2526         rpc_clnt_sigunmask(clnt, &oldset);
2527         *timeout <<= 1;
2528         return res;
2529 }
2530
2531 /* This is the error handling routine for processes that are allowed
2532  * to sleep.
2533  */
2534 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2535 {
2536         struct nfs4_client *clp = server->nfs4_state;
2537         int ret = errorcode;
2538
2539         exception->retry = 0;
2540         switch(errorcode) {
2541                 case 0:
2542                         return 0;
2543                 case -NFS4ERR_STALE_CLIENTID:
2544                 case -NFS4ERR_STALE_STATEID:
2545                 case -NFS4ERR_EXPIRED:
2546                         ret = nfs4_wait_clnt_recover(server->client, clp);
2547                         if (ret == 0)
2548                                 exception->retry = 1;
2549                         break;
2550                 case -NFS4ERR_GRACE:
2551                 case -NFS4ERR_DELAY:
2552                         ret = nfs4_delay(server->client, &exception->timeout);
2553                         if (ret == 0)
2554                                 exception->retry = 1;
2555                         break;
2556                 case -NFS4ERR_OLD_STATEID:
2557                         if (ret == 0)
2558                                 exception->retry = 1;
2559         }
2560         /* We failed to handle the error */
2561         return nfs4_map_errors(ret);
2562 }
2563
2564 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2565 {
2566         nfs4_verifier sc_verifier;
2567         struct nfs4_setclientid setclientid = {
2568                 .sc_verifier = &sc_verifier,
2569                 .sc_prog = program,
2570         };
2571         struct rpc_message msg = {
2572                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2573                 .rpc_argp = &setclientid,
2574                 .rpc_resp = clp,
2575                 .rpc_cred = clp->cl_cred,
2576         };
2577         u32 *p;
2578         int loop = 0;
2579         int status;
2580
2581         p = (u32*)sc_verifier.data;
2582         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2583         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2584
2585         for(;;) {
2586                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2587                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2588                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2589                                 clp->cl_cred->cr_ops->cr_name,
2590                                 clp->cl_id_uniquifier);
2591                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2592                                 sizeof(setclientid.sc_netid), "tcp");
2593                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2594                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2595                                 clp->cl_ipaddr, port >> 8, port & 255);
2596
2597                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2598                 if (status != -NFS4ERR_CLID_INUSE)
2599                         break;
2600                 if (signalled())
2601                         break;
2602                 if (loop++ & 1)
2603                         ssleep(clp->cl_lease_time + 1);
2604                 else
2605                         if (++clp->cl_id_uniquifier == 0)
2606                                 break;
2607         }
2608         return status;
2609 }
2610
2611 int
2612 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2613 {
2614         struct nfs_fsinfo fsinfo;
2615         struct rpc_message msg = {
2616                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2617                 .rpc_argp = clp,
2618                 .rpc_resp = &fsinfo,
2619                 .rpc_cred = clp->cl_cred,
2620         };
2621         unsigned long now;
2622         int status;
2623
2624         now = jiffies;
2625         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2626         if (status == 0) {
2627                 spin_lock(&clp->cl_lock);
2628                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2629                 clp->cl_last_renewal = now;
2630                 spin_unlock(&clp->cl_lock);
2631         }
2632         return status;
2633 }
2634
2635 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2636 {
2637         struct nfs4_delegreturnargs args = {
2638                 .fhandle = NFS_FH(inode),
2639                 .stateid = stateid,
2640         };
2641         struct rpc_message msg = {
2642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2643                 .rpc_argp = &args,
2644                 .rpc_cred = cred,
2645         };
2646
2647         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2648 }
2649
2650 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2651 {
2652         struct nfs_server *server = NFS_SERVER(inode);
2653         struct nfs4_exception exception = { };
2654         int err;
2655         do {
2656                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2657                 switch (err) {
2658                         case -NFS4ERR_STALE_STATEID:
2659                         case -NFS4ERR_EXPIRED:
2660                                 nfs4_schedule_state_recovery(server->nfs4_state);
2661                         case 0:
2662                                 return 0;
2663                 }
2664                 err = nfs4_handle_exception(server, err, &exception);
2665         } while (exception.retry);
2666         return err;
2667 }
2668
2669 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2670 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2671
2672 /*
2673  * sleep, with exponential backoff, and retry the LOCK operation.
2674  */
2675 static unsigned long
2676 nfs4_set_lock_task_retry(unsigned long timeout)
2677 {
2678         schedule_timeout_interruptible(timeout);
2679         timeout <<= 1;
2680         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2681                 return NFS4_LOCK_MAXTIMEOUT;
2682         return timeout;
2683 }
2684
2685 static inline int
2686 nfs4_lck_type(int cmd, struct file_lock *request)
2687 {
2688         /* set lock type */
2689         switch (request->fl_type) {
2690                 case F_RDLCK:
2691                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2692                 case F_WRLCK:
2693                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2694                 case F_UNLCK:
2695                         return NFS4_WRITE_LT;
2696         }
2697         BUG();
2698         return 0;
2699 }
2700
2701 static inline uint64_t
2702 nfs4_lck_length(struct file_lock *request)
2703 {
2704         if (request->fl_end == OFFSET_MAX)
2705                 return ~(uint64_t)0;
2706         return request->fl_end - request->fl_start + 1;
2707 }
2708
2709 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2710 {
2711         struct inode *inode = state->inode;
2712         struct nfs_server *server = NFS_SERVER(inode);
2713         struct nfs4_client *clp = server->nfs4_state;
2714         struct nfs_lockargs arg = {
2715                 .fh = NFS_FH(inode),
2716                 .type = nfs4_lck_type(cmd, request),
2717                 .offset = request->fl_start,
2718                 .length = nfs4_lck_length(request),
2719         };
2720         struct nfs_lockres res = {
2721                 .server = server,
2722         };
2723         struct rpc_message msg = {
2724                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2725                 .rpc_argp       = &arg,
2726                 .rpc_resp       = &res,
2727                 .rpc_cred       = state->owner->so_cred,
2728         };
2729         struct nfs_lowner nlo;
2730         struct nfs4_lock_state *lsp;
2731         int status;
2732
2733         down_read(&clp->cl_sem);
2734         nlo.clientid = clp->cl_clientid;
2735         status = nfs4_set_lock_state(state, request);
2736         if (status != 0)
2737                 goto out;
2738         lsp = request->fl_u.nfs4_fl.owner;
2739         nlo.id = lsp->ls_id;
2740         arg.u.lockt = &nlo;
2741         status = rpc_call_sync(server->client, &msg, 0);
2742         if (!status) {
2743                 request->fl_type = F_UNLCK;
2744         } else if (status == -NFS4ERR_DENIED) {
2745                 int64_t len, start, end;
2746                 start = res.u.denied.offset;
2747                 len = res.u.denied.length;
2748                 end = start + len - 1;
2749                 if (end < 0 || len == 0)
2750                         request->fl_end = OFFSET_MAX;
2751                 else
2752                         request->fl_end = (loff_t)end;
2753                 request->fl_start = (loff_t)start;
2754                 request->fl_type = F_WRLCK;
2755                 if (res.u.denied.type & 1)
2756                         request->fl_type = F_RDLCK;
2757                 request->fl_pid = 0;
2758                 status = 0;
2759         }
2760 out:
2761         up_read(&clp->cl_sem);
2762         return status;
2763 }
2764
2765 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2766 {
2767         struct nfs4_exception exception = { };
2768         int err;
2769
2770         do {
2771                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2772                                 _nfs4_proc_getlk(state, cmd, request),
2773                                 &exception);
2774         } while (exception.retry);
2775         return err;
2776 }
2777
2778 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2779 {
2780         int res = 0;
2781         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2782                 case FL_POSIX:
2783                         res = posix_lock_file_wait(file, fl);
2784                         break;
2785                 case FL_FLOCK:
2786                         res = flock_lock_file_wait(file, fl);
2787                         break;
2788                 default:
2789                         BUG();
2790         }
2791         if (res < 0)
2792                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2793                                 __FUNCTION__);
2794         return res;
2795 }
2796
2797 struct nfs4_unlockdata {
2798         struct nfs_lockargs arg;
2799         struct nfs_locku_opargs luargs;
2800         struct nfs_lockres res;
2801         struct nfs4_lock_state *lsp;
2802         struct nfs_open_context *ctx;
2803         atomic_t refcount;
2804         struct completion completion;
2805 };
2806
2807 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2808 {
2809         if (atomic_dec_and_test(&calldata->refcount)) {
2810                 nfs_free_seqid(calldata->luargs.seqid);
2811                 nfs4_put_lock_state(calldata->lsp);
2812                 put_nfs_open_context(calldata->ctx);
2813                 kfree(calldata);
2814         }
2815 }
2816
2817 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2818 {
2819         complete(&calldata->completion);
2820         nfs4_locku_release_calldata(calldata);
2821 }
2822
2823 static void nfs4_locku_done(struct rpc_task *task)
2824 {
2825         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2826
2827         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2828         switch (task->tk_status) {
2829                 case 0:
2830                         memcpy(calldata->lsp->ls_stateid.data,
2831                                         calldata->res.u.stateid.data,
2832                                         sizeof(calldata->lsp->ls_stateid.data));
2833                         break;
2834                 case -NFS4ERR_STALE_STATEID:
2835                 case -NFS4ERR_EXPIRED:
2836                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2837                         break;
2838                 default:
2839                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2840                                 rpc_restart_call(task);
2841                                 return;
2842                         }
2843         }
2844         nfs4_locku_complete(calldata);
2845 }
2846
2847 static void nfs4_locku_begin(struct rpc_task *task)
2848 {
2849         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2850         struct rpc_message msg = {
2851                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2852                 .rpc_argp       = &calldata->arg,
2853                 .rpc_resp       = &calldata->res,
2854                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2855         };
2856         int status;
2857
2858         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2859         if (status != 0)
2860                 return;
2861         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2862                 nfs4_locku_complete(calldata);
2863                 task->tk_exit = NULL;
2864                 rpc_exit(task, 0);
2865                 return;
2866         }
2867         rpc_call_setup(task, &msg, 0);
2868 }
2869
2870 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2871 {
2872         struct nfs4_unlockdata *calldata;
2873         struct inode *inode = state->inode;
2874         struct nfs_server *server = NFS_SERVER(inode);
2875         struct nfs4_lock_state *lsp;
2876         int status;
2877
2878         status = nfs4_set_lock_state(state, request);
2879         if (status != 0)
2880                 return status;
2881         lsp = request->fl_u.nfs4_fl.owner;
2882         /* We might have lost the locks! */
2883         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2884                 return 0;
2885         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2886         if (calldata == NULL)
2887                 return -ENOMEM;
2888         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2889         if (calldata->luargs.seqid == NULL) {
2890                 kfree(calldata);
2891                 return -ENOMEM;
2892         }
2893         calldata->luargs.stateid = &lsp->ls_stateid;
2894         calldata->arg.fh = NFS_FH(inode);
2895         calldata->arg.type = nfs4_lck_type(cmd, request);
2896         calldata->arg.offset = request->fl_start;
2897         calldata->arg.length = nfs4_lck_length(request);
2898         calldata->arg.u.locku = &calldata->luargs;
2899         calldata->res.server = server;
2900         calldata->lsp = lsp;
2901         atomic_inc(&lsp->ls_count);
2902
2903         /* Ensure we don't close file until we're done freeing locks! */
2904         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2905
2906         atomic_set(&calldata->refcount, 2);
2907         init_completion(&calldata->completion);
2908
2909         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2910                         nfs4_locku_done, calldata);
2911         if (status == 0)
2912                 wait_for_completion_interruptible(&calldata->completion);
2913         do_vfs_lock(request->fl_file, request);
2914         nfs4_locku_release_calldata(calldata);
2915         return status;
2916 }
2917
2918 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2919 {
2920         struct inode *inode = state->inode;
2921         struct nfs_server *server = NFS_SERVER(inode);
2922         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2923         struct nfs_lock_opargs largs = {
2924                 .lock_stateid = &lsp->ls_stateid,
2925                 .open_stateid = &state->stateid,
2926                 .lock_owner = {
2927                         .clientid = server->nfs4_state->cl_clientid,
2928                         .id = lsp->ls_id,
2929                 },
2930                 .reclaim = reclaim,
2931         };
2932         struct nfs_lockargs arg = {
2933                 .fh = NFS_FH(inode),
2934                 .type = nfs4_lck_type(cmd, request),
2935                 .offset = request->fl_start,
2936                 .length = nfs4_lck_length(request),
2937                 .u = {
2938                         .lock = &largs,
2939                 },
2940         };
2941         struct nfs_lockres res = {
2942                 .server = server,
2943         };
2944         struct rpc_message msg = {
2945                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2946                 .rpc_argp       = &arg,
2947                 .rpc_resp       = &res,
2948                 .rpc_cred       = state->owner->so_cred,
2949         };
2950         int status = -ENOMEM;
2951
2952         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2953         if (largs.lock_seqid == NULL)
2954                 return -ENOMEM;
2955         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
2956                 struct nfs4_state_owner *owner = state->owner;
2957
2958                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
2959                 if (largs.open_seqid == NULL)
2960                         goto out;
2961                 largs.new_lock_owner = 1;
2962                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2963                 /* increment open seqid on success, and seqid mutating errors */
2964                 if (largs.new_lock_owner != 0) {
2965                         nfs_increment_open_seqid(status, largs.open_seqid);
2966                         if (status == 0)
2967                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
2968                 }
2969                 nfs_free_seqid(largs.open_seqid);
2970         } else
2971                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2972         /* increment lock seqid on success, and seqid mutating errors*/
2973         nfs_increment_lock_seqid(status, largs.lock_seqid);
2974         /* save the returned stateid. */
2975         if (status == 0) {
2976                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
2977                                 sizeof(lsp->ls_stateid.data));
2978                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2979         } else if (status == -NFS4ERR_DENIED)
2980                 status = -EAGAIN;
2981 out:
2982         nfs_free_seqid(largs.lock_seqid);
2983         return status;
2984 }
2985
2986 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2987 {
2988         struct nfs_server *server = NFS_SERVER(state->inode);
2989         struct nfs4_exception exception = { };
2990         int err;
2991
2992         do {
2993                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
2994                 if (err != -NFS4ERR_DELAY)
2995                         break;
2996                 nfs4_handle_exception(server, err, &exception);
2997         } while (exception.retry);
2998         return err;
2999 }
3000
3001 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3002 {
3003         struct nfs_server *server = NFS_SERVER(state->inode);
3004         struct nfs4_exception exception = { };
3005         int err;
3006
3007         do {
3008                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3009                 if (err != -NFS4ERR_DELAY)
3010                         break;
3011                 nfs4_handle_exception(server, err, &exception);
3012         } while (exception.retry);
3013         return err;
3014 }
3015
3016 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3017 {
3018         struct nfs4_client *clp = state->owner->so_client;
3019         int status;
3020
3021         down_read(&clp->cl_sem);
3022         status = nfs4_set_lock_state(state, request);
3023         if (status == 0)
3024                 status = _nfs4_do_setlk(state, cmd, request, 0);
3025         if (status == 0) {
3026                 /* Note: we always want to sleep here! */
3027                 request->fl_flags |= FL_SLEEP;
3028                 if (do_vfs_lock(request->fl_file, request) < 0)
3029                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3030         }
3031         up_read(&clp->cl_sem);
3032         return status;
3033 }
3034
3035 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3036 {
3037         struct nfs4_exception exception = { };
3038         int err;
3039
3040         do {
3041                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3042                                 _nfs4_proc_setlk(state, cmd, request),
3043                                 &exception);
3044         } while (exception.retry);
3045         return err;
3046 }
3047
3048 static int
3049 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3050 {
3051         struct nfs_open_context *ctx;
3052         struct nfs4_state *state;
3053         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3054         int status;
3055
3056         /* verify open state */
3057         ctx = (struct nfs_open_context *)filp->private_data;
3058         state = ctx->state;
3059
3060         if (request->fl_start < 0 || request->fl_end < 0)
3061                 return -EINVAL;
3062
3063         if (IS_GETLK(cmd))
3064                 return nfs4_proc_getlk(state, F_GETLK, request);
3065
3066         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3067                 return -EINVAL;
3068
3069         if (request->fl_type == F_UNLCK)
3070                 return nfs4_proc_unlck(state, cmd, request);
3071
3072         do {
3073                 status = nfs4_proc_setlk(state, cmd, request);
3074                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3075                         break;
3076                 timeout = nfs4_set_lock_task_retry(timeout);
3077                 status = -ERESTARTSYS;
3078                 if (signalled())
3079                         break;
3080         } while(status < 0);
3081         return status;
3082 }
3083
3084
3085 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3086
3087 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3088                 size_t buflen, int flags)
3089 {
3090         struct inode *inode = dentry->d_inode;
3091
3092         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3093                 return -EOPNOTSUPP;
3094
3095         if (!S_ISREG(inode->i_mode) &&
3096             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3097                 return -EPERM;
3098
3099         return nfs4_proc_set_acl(inode, buf, buflen);
3100 }
3101
3102 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3103  * and that's what we'll do for e.g. user attributes that haven't been set.
3104  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3105  * attributes in kernel-managed attribute namespaces. */
3106 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3107                 size_t buflen)
3108 {
3109         struct inode *inode = dentry->d_inode;
3110
3111         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3112                 return -EOPNOTSUPP;
3113
3114         return nfs4_proc_get_acl(inode, buf, buflen);
3115 }
3116
3117 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3118 {
3119         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3120
3121         if (buf && buflen < len)
3122                 return -ERANGE;
3123         if (buf)
3124                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3125         return len;
3126 }
3127
3128 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3129         .recover_open   = nfs4_open_reclaim,
3130         .recover_lock   = nfs4_lock_reclaim,
3131 };
3132
3133 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3134         .recover_open   = nfs4_open_expired,
3135         .recover_lock   = nfs4_lock_expired,
3136 };
3137
3138 static struct inode_operations nfs4_file_inode_operations = {
3139         .permission     = nfs_permission,
3140         .getattr        = nfs_getattr,
3141         .setattr        = nfs_setattr,
3142         .getxattr       = nfs4_getxattr,
3143         .setxattr       = nfs4_setxattr,
3144         .listxattr      = nfs4_listxattr,
3145 };
3146
3147 struct nfs_rpc_ops      nfs_v4_clientops = {
3148         .version        = 4,                    /* protocol version */
3149         .dentry_ops     = &nfs4_dentry_operations,
3150         .dir_inode_ops  = &nfs4_dir_inode_operations,
3151         .file_inode_ops = &nfs4_file_inode_operations,
3152         .getroot        = nfs4_proc_get_root,
3153         .getattr        = nfs4_proc_getattr,
3154         .setattr        = nfs4_proc_setattr,
3155         .lookup         = nfs4_proc_lookup,
3156         .access         = nfs4_proc_access,
3157         .readlink       = nfs4_proc_readlink,
3158         .read           = nfs4_proc_read,
3159         .write          = nfs4_proc_write,
3160         .commit         = nfs4_proc_commit,
3161         .create         = nfs4_proc_create,
3162         .remove         = nfs4_proc_remove,
3163         .unlink_setup   = nfs4_proc_unlink_setup,
3164         .unlink_done    = nfs4_proc_unlink_done,
3165         .rename         = nfs4_proc_rename,
3166         .link           = nfs4_proc_link,
3167         .symlink        = nfs4_proc_symlink,
3168         .mkdir          = nfs4_proc_mkdir,
3169         .rmdir          = nfs4_proc_remove,
3170         .readdir        = nfs4_proc_readdir,
3171         .mknod          = nfs4_proc_mknod,
3172         .statfs         = nfs4_proc_statfs,
3173         .fsinfo         = nfs4_proc_fsinfo,
3174         .pathconf       = nfs4_proc_pathconf,
3175         .decode_dirent  = nfs4_decode_dirent,
3176         .read_setup     = nfs4_proc_read_setup,
3177         .write_setup    = nfs4_proc_write_setup,
3178         .commit_setup   = nfs4_proc_commit_setup,
3179         .file_open      = nfs_open,
3180         .file_release   = nfs_release,
3181         .lock           = nfs4_proc_lock,
3182         .clear_acl_cache = nfs4_zap_acl_attr,
3183 };
3184
3185 /*
3186  * Local variables:
3187  *  c-basic-offset: 8
3188  * End:
3189  */