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   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54
  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         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 191                 nfsi->change_attr = cinfo->after;
 192 }
 193
 194 /* Helper for asynchronous RPC calls */
 195 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
 196                 rpc_action tk_exit, void *calldata)
 197 {
 198         struct rpc_task *task;
 199
 200         if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
 201                 return -ENOMEM;
 202
 203         task->tk_calldata = calldata;
 204         task->tk_action = tk_begin;
 205         rpc_execute(task);
 206         return 0;
 207 }
 208
 209 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 210 {
 211         struct inode *inode = state->inode;
 212
 213         open_flags &= (FMODE_READ|FMODE_WRITE);
 214         /* Protect against nfs4_find_state() */
 215         spin_lock(&state->owner->so_lock);
 216         spin_lock(&inode->i_lock);
 217         state->state |= open_flags;
 218         /* NB! List reordering - see the reclaim code for why.  */
 219         if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
 220                 list_move(&state->open_states, &state->owner->so_states);
 221         if (open_flags & FMODE_READ)
 222                 state->nreaders++;
 223         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 224         spin_unlock(&inode->i_lock);
 225         spin_unlock(&state->owner->so_lock);
 226 }
 227
 228 /*
 229  * OPEN_RECLAIM:
 230  *      reclaim state on the server after a reboot.
 231  */
 232 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 233 {
 234         struct inode *inode = state->inode;
 235         struct nfs_server *server = NFS_SERVER(inode);
 236         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 237         struct nfs_openargs o_arg = {
 238                 .fh = NFS_FH(inode),
 239                 .id = sp->so_id,
 240                 .open_flags = state->state,
 241                 .clientid = server->nfs4_state->cl_clientid,
 242                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 243                 .bitmask = server->attr_bitmask,
 244         };
 245         struct nfs_openres o_res = {
 246                 .server = server,       /* Grrr */
 247         };
 248         struct rpc_message msg = {
 249                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 250                 .rpc_argp       = &o_arg,
 251                 .rpc_resp       = &o_res,
 252                 .rpc_cred       = sp->so_cred,
 253         };
 254         int status;
 255
 256         if (delegation != NULL) {
 257                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 258                         memcpy(&state->stateid, &delegation->stateid,
 259                                         sizeof(state->stateid));
 260                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 261                         return 0;
 262                 }
 263                 o_arg.u.delegation_type = delegation->type;
 264         }
 265         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 266         if (o_arg.seqid == NULL)
 267                 return -ENOMEM;
 268         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 269         /* Confirm the sequence as being established */
 270         nfs_confirm_seqid(&sp->so_seqid, status);
 271         nfs_increment_open_seqid(status, o_arg.seqid);
 272         if (status == 0) {
 273                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 274                 if (o_res.delegation_type != 0) {
 275                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 276                         /* Did the server issue an immediate delegation recall? */
 277                         if (o_res.do_recall)
 278                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 279                 }
 280         }
 281         nfs_free_seqid(o_arg.seqid);
 282         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 283         /* Ensure we update the inode attributes */
 284         NFS_CACHEINV(inode);
 285         return status;
 286 }
 287
 288 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 289 {
 290         struct nfs_server *server = NFS_SERVER(state->inode);
 291         struct nfs4_exception exception = { };
 292         int err;
 293         do {
 294                 err = _nfs4_open_reclaim(sp, state);
 295                 if (err != -NFS4ERR_DELAY)
 296                         break;
 297                 nfs4_handle_exception(server, err, &exception);
 298         } while (exception.retry);
 299         return err;
 300 }
 301
 302 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 303 {
 304         struct nfs4_state_owner  *sp  = state->owner;
 305         struct inode *inode = dentry->d_inode;
 306         struct nfs_server *server = NFS_SERVER(inode);
 307         struct dentry *parent = dget_parent(dentry);
 308         struct nfs_openargs arg = {
 309                 .fh = NFS_FH(parent->d_inode),
 310                 .clientid = server->nfs4_state->cl_clientid,
 311                 .name = &dentry->d_name,
 312                 .id = sp->so_id,
 313                 .server = server,
 314                 .bitmask = server->attr_bitmask,
 315                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 316         };
 317         struct nfs_openres res = {
 318                 .server = server,
 319         };
 320         struct  rpc_message msg = {
 321                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 322                 .rpc_argp       = &arg,
 323                 .rpc_resp       = &res,
 324                 .rpc_cred       = sp->so_cred,
 325         };
 326         int status = 0;
 327
 328         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 329                 goto out;
 330         if (state->state == 0)
 331                 goto out;
 332         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 333         status = -ENOMEM;
 334         if (arg.seqid == NULL)
 335                 goto out;
 336         arg.open_flags = state->state;
 337         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 338         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 339         nfs_increment_open_seqid(status, arg.seqid);
 340         if (status != 0)
 341                 goto out_free;
 342         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 343                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 344                                 sp, &res.stateid, arg.seqid);
 345                 if (status != 0)
 346                         goto out_free;
 347         }
 348         nfs_confirm_seqid(&sp->so_seqid, 0);
 349         if (status >= 0) {
 350                 memcpy(state->stateid.data, res.stateid.data,
 351                                 sizeof(state->stateid.data));
 352                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 353         }
 354 out_free:
 355         nfs_free_seqid(arg.seqid);
 356 out:
 357         dput(parent);
 358         return status;
 359 }
 360
 361 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 362 {
 363         struct nfs4_exception exception = { };
 364         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 365         int err;
 366         do {
 367                 err = _nfs4_open_delegation_recall(dentry, state);
 368                 switch (err) {
 369                         case 0:
 370                                 return err;
 371                         case -NFS4ERR_STALE_CLIENTID:
 372                         case -NFS4ERR_STALE_STATEID:
 373                         case -NFS4ERR_EXPIRED:
 374                                 /* Don't recall a delegation if it was lost */
 375                                 nfs4_schedule_state_recovery(server->nfs4_state);
 376                                 return err;
 377                 }
 378                 err = nfs4_handle_exception(server, err, &exception);
 379         } while (exception.retry);
 380         return err;
 381 }
 382
 383 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)
 384 {
 385         struct nfs_open_confirmargs arg = {
 386                 .fh             = fh,
 387                 .seqid          = seqid,
 388                 .stateid        = *stateid,
 389         };
 390         struct nfs_open_confirmres res;
 391         struct  rpc_message msg = {
 392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 393                 .rpc_argp       = &arg,
 394                 .rpc_resp       = &res,
 395                 .rpc_cred       = sp->so_cred,
 396         };
 397         int status;
 398
 399         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 400         /* Confirm the sequence as being established */
 401         nfs_confirm_seqid(&sp->so_seqid, status);
 402         nfs_increment_open_seqid(status, seqid);
 403         if (status >= 0)
 404                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 405         return status;
 406 }
 407
 408 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 409 {
 410         struct nfs_server *server = NFS_SERVER(dir);
 411         struct rpc_message msg = {
 412                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 413                 .rpc_argp = o_arg,
 414                 .rpc_resp = o_res,
 415                 .rpc_cred = sp->so_cred,
 416         };
 417         int status;
 418
 419         /* Update sequence id. The caller must serialize! */
 420         o_arg->id = sp->so_id;
 421         o_arg->clientid = sp->so_client->cl_clientid;
 422
 423         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 424         if (status == 0) {
 425                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 426                 switch (o_res->f_attr->mode & S_IFMT) {
 427                         case S_IFREG:
 428                                 break;
 429                         case S_IFLNK:
 430                                 status = -ELOOP;
 431                                 break;
 432                         case S_IFDIR:
 433                                 status = -EISDIR;
 434                                 break;
 435                         default:
 436                                 status = -ENOTDIR;
 437                 }
 438         }
 439
 440         nfs_increment_open_seqid(status, o_arg->seqid);
 441         if (status != 0)
 442                 goto out;
 443         update_changeattr(dir, &o_res->cinfo);
 444         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 445                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 446                                 sp, &o_res->stateid, o_arg->seqid);
 447                 if (status != 0)
 448                         goto out;
 449         }
 450         nfs_confirm_seqid(&sp->so_seqid, 0);
 451         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 452                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 453 out:
 454         return status;
 455 }
 456
 457 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 458 {
 459         struct nfs_access_entry cache;
 460         int mask = 0;
 461         int status;
 462
 463         if (openflags & FMODE_READ)
 464                 mask |= MAY_READ;
 465         if (openflags & FMODE_WRITE)
 466                 mask |= MAY_WRITE;
 467         status = nfs_access_get_cached(inode, cred, &cache);
 468         if (status == 0)
 469                 goto out;
 470
 471         /* Be clever: ask server to check for all possible rights */
 472         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 473         cache.cred = cred;
 474         cache.jiffies = jiffies;
 475         status = _nfs4_proc_access(inode, &cache);
 476         if (status != 0)
 477                 return status;
 478         nfs_access_add_cache(inode, &cache);
 479 out:
 480         if ((cache.mask & mask) == mask)
 481                 return 0;
 482         return -EACCES;
 483 }
 484
 485 /*
 486  * OPEN_EXPIRED:
 487  *      reclaim state on the server after a network partition.
 488  *      Assumes caller holds the appropriate lock
 489  */
 490 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 491 {
 492         struct dentry *parent = dget_parent(dentry);
 493         struct inode *dir = parent->d_inode;
 494         struct inode *inode = state->inode;
 495         struct nfs_server *server = NFS_SERVER(dir);
 496         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 497         struct nfs_fattr        f_attr = {
 498                 .valid = 0,
 499         };
 500         struct nfs_openargs o_arg = {
 501                 .fh = NFS_FH(dir),
 502                 .open_flags = state->state,
 503                 .name = &dentry->d_name,
 504                 .bitmask = server->attr_bitmask,
 505                 .claim = NFS4_OPEN_CLAIM_NULL,
 506         };
 507         struct nfs_openres o_res = {
 508                 .f_attr = &f_attr,
 509                 .server = server,
 510         };
 511         int status = 0;
 512
 513         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 514                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 515                 if (status < 0)
 516                         goto out;
 517                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 518                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 519                 goto out;
 520         }
 521         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 522         status = -ENOMEM;
 523         if (o_arg.seqid == NULL)
 524                 goto out;
 525         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 526         if (status != 0)
 527                 goto out_nodeleg;
 528         /* Check if files differ */
 529         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 530                 goto out_stale;
 531         /* Has the file handle changed? */
 532         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 533                 /* Verify if the change attributes are the same */
 534                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 535                         goto out_stale;
 536                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 537                         goto out_stale;
 538                 /* Lets just pretend that this is the same file */
 539                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 540                 NFS_I(inode)->fileid = f_attr.fileid;
 541         }
 542         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 543         if (o_res.delegation_type != 0) {
 544                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 545                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 546                 else
 547                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 548         }
 549 out_nodeleg:
 550         nfs_free_seqid(o_arg.seqid);
 551         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 552 out:
 553         dput(parent);
 554         return status;
 555 out_stale:
 556         status = -ESTALE;
 557         /* Invalidate the state owner so we don't ever use it again */
 558         nfs4_drop_state_owner(sp);
 559         d_drop(dentry);
 560         /* Should we be trying to close that stateid? */
 561         goto out_nodeleg;
 562 }
 563
 564 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 565 {
 566         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 567         struct nfs4_exception exception = { };
 568         int err;
 569
 570         do {
 571                 err = _nfs4_open_expired(sp, state, dentry);
 572                 if (err == -NFS4ERR_DELAY)
 573                         nfs4_handle_exception(server, err, &exception);
 574         } while (exception.retry);
 575         return err;
 576 }
 577
 578 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 579 {
 580         struct nfs_inode *nfsi = NFS_I(state->inode);
 581         struct nfs_open_context *ctx;
 582         int status;
 583
 584         spin_lock(&state->inode->i_lock);
 585         list_for_each_entry(ctx, &nfsi->open_files, list) {
 586                 if (ctx->state != state)
 587                         continue;
 588                 get_nfs_open_context(ctx);
 589                 spin_unlock(&state->inode->i_lock);
 590                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 591                 put_nfs_open_context(ctx);
 592                 return status;
 593         }
 594         spin_unlock(&state->inode->i_lock);
 595         return -ENOENT;
 596 }
 597
 598 /*
 599  * Returns an nfs4_state + an extra reference to the inode
 600  */
 601 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 602 {
 603         struct nfs_delegation *delegation;
 604         struct nfs_server *server = NFS_SERVER(inode);
 605         struct nfs4_client *clp = server->nfs4_state;
 606         struct nfs_inode *nfsi = NFS_I(inode);
 607         struct nfs4_state_owner *sp = NULL;
 608         struct nfs4_state *state = NULL;
 609         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 610         int err;
 611
 612         /* Protect against reboot recovery - NOTE ORDER! */
 613         down_read(&clp->cl_sem);
 614         /* Protect against delegation recall */
 615         down_read(&nfsi->rwsem);
 616         delegation = NFS_I(inode)->delegation;
 617         err = -ENOENT;
 618         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 619                 goto out_err;
 620         err = -ENOMEM;
 621         if (!(sp = nfs4_get_state_owner(server, cred))) {
 622                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 623                 goto out_err;
 624         }
 625         state = nfs4_get_open_state(inode, sp);
 626         if (state == NULL)
 627                 goto out_err;
 628
 629         err = -ENOENT;
 630         if ((state->state & open_flags) == open_flags) {
 631                 spin_lock(&inode->i_lock);
 632                 if (open_flags & FMODE_READ)
 633                         state->nreaders++;
 634                 if (open_flags & FMODE_WRITE)
 635                         state->nwriters++;
 636                 spin_unlock(&inode->i_lock);
 637                 goto out_ok;
 638         } else if (state->state != 0)
 639                 goto out_err;
 640
 641         lock_kernel();
 642         err = _nfs4_do_access(inode, cred, open_flags);
 643         unlock_kernel();
 644         if (err != 0)
 645                 goto out_err;
 646         set_bit(NFS_DELEGATED_STATE, &state->flags);
 647         update_open_stateid(state, &delegation->stateid, open_flags);
 648 out_ok:
 649         nfs4_put_state_owner(sp);
 650         up_read(&nfsi->rwsem);
 651         up_read(&clp->cl_sem);
 652         igrab(inode);
 653         *res = state;
 654         return 0;
 655 out_err:
 656         if (sp != NULL) {
 657                 if (state != NULL)
 658                         nfs4_put_open_state(state);
 659                 nfs4_put_state_owner(sp);
 660         }
 661         up_read(&nfsi->rwsem);
 662         up_read(&clp->cl_sem);
 663         if (err != -EACCES)
 664                 nfs_inode_return_delegation(inode);
 665         return err;
 666 }
 667
 668 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 669 {
 670         struct nfs4_exception exception = { };
 671         struct nfs4_state *res;
 672         int err;
 673
 674         do {
 675                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 676                 if (err == 0)
 677                         break;
 678                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 679                                         err, &exception));
 680         } while (exception.retry);
 681         return res;
 682 }
 683
 684 /*
 685  * Returns an nfs4_state + an referenced inode
 686  */
 687 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 688 {
 689         struct nfs4_state_owner  *sp;
 690         struct nfs4_state     *state = NULL;
 691         struct nfs_server       *server = NFS_SERVER(dir);
 692         struct nfs4_client *clp = server->nfs4_state;
 693         struct inode *inode = NULL;
 694         int                     status;
 695         struct nfs_fattr        f_attr = {
 696                 .valid          = 0,
 697         };
 698         struct nfs_openargs o_arg = {
 699                 .fh             = NFS_FH(dir),
 700                 .open_flags     = flags,
 701                 .name           = &dentry->d_name,
 702                 .server         = server,
 703                 .bitmask = server->attr_bitmask,
 704                 .claim = NFS4_OPEN_CLAIM_NULL,
 705         };
 706         struct nfs_openres o_res = {
 707                 .f_attr         = &f_attr,
 708                 .server         = server,
 709         };
 710
 711         /* Protect against reboot recovery conflicts */
 712         down_read(&clp->cl_sem);
 713         status = -ENOMEM;
 714         if (!(sp = nfs4_get_state_owner(server, cred))) {
 715                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 716                 goto out_err;
 717         }
 718         if (flags & O_EXCL) {
 719                 u32 *p = (u32 *) o_arg.u.verifier.data;
 720                 p[0] = jiffies;
 721                 p[1] = current->pid;
 722         } else
 723                 o_arg.u.attrs = sattr;
 724         /* Serialization for the sequence id */
 725
 726         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 727         if (o_arg.seqid == NULL)
 728                 return -ENOMEM;
 729         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 730         if (status != 0)
 731                 goto out_err;
 732
 733         status = -ENOMEM;
 734         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 735         if (!inode)
 736                 goto out_err;
 737         state = nfs4_get_open_state(inode, sp);
 738         if (!state)
 739                 goto out_err;
 740         update_open_stateid(state, &o_res.stateid, flags);
 741         if (o_res.delegation_type != 0)
 742                 nfs_inode_set_delegation(inode, cred, &o_res);
 743         nfs_free_seqid(o_arg.seqid);
 744         nfs4_put_state_owner(sp);
 745         up_read(&clp->cl_sem);
 746         *res = state;
 747         return 0;
 748 out_err:
 749         if (sp != NULL) {
 750                 if (state != NULL)
 751                         nfs4_put_open_state(state);
 752                 nfs_free_seqid(o_arg.seqid);
 753                 nfs4_put_state_owner(sp);
 754         }
 755         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 756         up_read(&clp->cl_sem);
 757         if (inode != NULL)
 758                 iput(inode);
 759         *res = NULL;
 760         return status;
 761 }
 762
 763
 764 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 765 {
 766         struct nfs4_exception exception = { };
 767         struct nfs4_state *res;
 768         int status;
 769
 770         do {
 771                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 772                 if (status == 0)
 773                         break;
 774                 /* NOTE: BAD_SEQID means the server and client disagree about the
 775                  * book-keeping w.r.t. state-changing operations
 776                  * (OPEN/CLOSE/LOCK/LOCKU...)
 777                  * It is actually a sign of a bug on the client or on the server.
 778                  *
 779                  * If we receive a BAD_SEQID error in the particular case of
 780                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 781                  * have unhashed the old state_owner for us, and that we can
 782                  * therefore safely retry using a new one. We should still warn
 783                  * the user though...
 784                  */
 785                 if (status == -NFS4ERR_BAD_SEQID) {
 786                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 787                         exception.retry = 1;
 788                         continue;
 789                 }
 790                 /*
 791                  * BAD_STATEID on OPEN means that the server cancelled our
 792                  * state before it received the OPEN_CONFIRM.
 793                  * Recover by retrying the request as per the discussion
 794                  * on Page 181 of RFC3530.
 795                  */
 796                 if (status == -NFS4ERR_BAD_STATEID) {
 797                         exception.retry = 1;
 798                         continue;
 799                 }
 800                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 801                                         status, &exception));
 802         } while (exception.retry);
 803         return res;
 804 }
 805
 806 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 807                 struct nfs_fh *fhandle, struct iattr *sattr,
 808                 struct nfs4_state *state)
 809 {
 810         struct nfs_setattrargs  arg = {
 811                 .fh             = fhandle,
 812                 .iap            = sattr,
 813                 .server         = server,
 814                 .bitmask = server->attr_bitmask,
 815         };
 816         struct nfs_setattrres  res = {
 817                 .fattr          = fattr,
 818                 .server         = server,
 819         };
 820         struct rpc_message msg = {
 821                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 822                 .rpc_argp       = &arg,
 823                 .rpc_resp       = &res,
 824         };
 825         int status;
 826
 827         fattr->valid = 0;
 828
 829         if (state != NULL) {
 830                 msg.rpc_cred = state->owner->so_cred;
 831                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 832         } else
 833                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 834
 835         status = rpc_call_sync(server->client, &msg, 0);
 836         return status;
 837 }
 838
 839 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 840                 struct nfs_fh *fhandle, struct iattr *sattr,
 841                 struct nfs4_state *state)
 842 {
 843         struct nfs4_exception exception = { };
 844         int err;
 845         do {
 846                 err = nfs4_handle_exception(server,
 847                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 848                                         state),
 849                                 &exception);
 850         } while (exception.retry);
 851         return err;
 852 }
 853
 854 struct nfs4_closedata {
 855         struct inode *inode;
 856         struct nfs4_state *state;
 857         struct nfs_closeargs arg;
 858         struct nfs_closeres res;
 859 };
 860
 861 static void nfs4_free_closedata(struct nfs4_closedata *calldata)
 862 {
 863         struct nfs4_state *state = calldata->state;
 864         struct nfs4_state_owner *sp = state->owner;
 865
 866         nfs4_put_open_state(calldata->state);
 867         nfs_free_seqid(calldata->arg.seqid);
 868         nfs4_put_state_owner(sp);
 869         kfree(calldata);
 870 }
 871
 872 static void nfs4_close_done(struct rpc_task *task)
 873 {
 874         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 875         struct nfs4_state *state = calldata->state;
 876         struct nfs_server *server = NFS_SERVER(calldata->inode);
 877
 878         /* hmm. we are done with the inode, and in the process of freeing
 879          * the state_owner. we keep this around to process errors
 880          */
 881         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 882         switch (task->tk_status) {
 883                 case 0:
 884                         memcpy(&state->stateid, &calldata->res.stateid,
 885                                         sizeof(state->stateid));
 886                         break;
 887                 case -NFS4ERR_STALE_STATEID:
 888                 case -NFS4ERR_EXPIRED:
 889                         state->state = calldata->arg.open_flags;
 890                         nfs4_schedule_state_recovery(server->nfs4_state);
 891                         break;
 892                 default:
 893                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 894                                 rpc_restart_call(task);
 895                                 return;
 896                         }
 897         }
 898         state->state = calldata->arg.open_flags;
 899         nfs4_free_closedata(calldata);
 900 }
 901
 902 static void nfs4_close_begin(struct rpc_task *task)
 903 {
 904         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 905         struct nfs4_state *state = calldata->state;
 906         struct rpc_message msg = {
 907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 908                 .rpc_argp = &calldata->arg,
 909                 .rpc_resp = &calldata->res,
 910                 .rpc_cred = state->owner->so_cred,
 911         };
 912         int mode = 0;
 913         int status;
 914
 915         status = nfs_wait_on_sequence(calldata->arg.seqid, task);
 916         if (status != 0)
 917                 return;
 918         /* Don't reorder reads */
 919         smp_rmb();
 920         /* Recalculate the new open mode in case someone reopened the file
 921          * while we were waiting in line to be scheduled.
 922          */
 923         if (state->nreaders != 0)
 924                 mode |= FMODE_READ;
 925         if (state->nwriters != 0)
 926                 mode |= FMODE_WRITE;
 927         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
 928                 state->state = mode;
 929         if (mode == state->state) {
 930                 nfs4_free_closedata(calldata);
 931                 task->tk_exit = NULL;
 932                 rpc_exit(task, 0);
 933                 return;
 934         }
 935         if (mode != 0)
 936                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 937         calldata->arg.open_flags = mode;
 938         rpc_call_setup(task, &msg, 0);
 939 }
 940
 941 /*
 942  * It is possible for data to be read/written from a mem-mapped file
 943  * after the sys_close call (which hits the vfs layer as a flush).
 944  * This means that we can't safely call nfsv4 close on a file until
 945  * the inode is cleared. This in turn means that we are not good
 946  * NFSv4 citizens - we do not indicate to the server to update the file's
 947  * share state even when we are done with one of the three share
 948  * stateid's in the inode.
 949  *
 950  * NOTE: Caller must be holding the sp->so_owner semaphore!
 951  */
 952 int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
 953 {
 954         struct nfs4_closedata *calldata;
 955         int status = -ENOMEM;
 956
 957         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 958         if (calldata == NULL)
 959                 goto out;
 960         calldata->inode = inode;
 961         calldata->state = state;
 962         calldata->arg.fh = NFS_FH(inode);
 963         calldata->arg.stateid = &state->stateid;
 964         /* Serialization for the sequence id */
 965         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 966         if (calldata->arg.seqid == NULL)
 967                 goto out_free_calldata;
 968
 969         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_close_begin,
 970                         nfs4_close_done, calldata);
 971         if (status == 0)
 972                 goto out;
 973
 974         nfs_free_seqid(calldata->arg.seqid);
 975 out_free_calldata:
 976         kfree(calldata);
 977 out:
 978         return status;
 979 }
 980
 981 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
 982 {
 983         struct file *filp;
 984
 985         filp = lookup_instantiate_filp(nd, dentry, NULL);
 986         if (!IS_ERR(filp)) {
 987                 struct nfs_open_context *ctx;
 988                 ctx = (struct nfs_open_context *)filp->private_data;
 989                 ctx->state = state;
 990         } else
 991                 nfs4_close_state(state, nd->intent.open.flags);
 992 }
 993
 994 struct dentry *
 995 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 996 {
 997         struct iattr attr;
 998         struct rpc_cred *cred;
 999         struct nfs4_state *state;
1000         struct dentry *res;
1001
1002         if (nd->flags & LOOKUP_CREATE) {
1003                 attr.ia_mode = nd->intent.open.create_mode;
1004                 attr.ia_valid = ATTR_MODE;
1005                 if (!IS_POSIXACL(dir))
1006                         attr.ia_mode &= ~current->fs->umask;
1007         } else {
1008                 attr.ia_valid = 0;
1009                 BUG_ON(nd->intent.open.flags & O_CREAT);
1010         }
1011
1012         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1013         if (IS_ERR(cred))
1014                 return (struct dentry *)cred;
1015         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1016         put_rpccred(cred);
1017         if (IS_ERR(state)) {
1018                 if (PTR_ERR(state) == -ENOENT)
1019                         d_add(dentry, NULL);
1020                 return (struct dentry *)state;
1021         }
1022         res = d_add_unique(dentry, state->inode);
1023         if (res != NULL)
1024                 dentry = res;
1025         nfs4_intent_set_file(nd, dentry, state);
1026         return res;
1027 }
1028
1029 int
1030 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1031 {
1032         struct rpc_cred *cred;
1033         struct nfs4_state *state;
1034         struct inode *inode;
1035
1036         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1037         if (IS_ERR(cred))
1038                 return PTR_ERR(cred);
1039         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1040         if (IS_ERR(state))
1041                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1042         put_rpccred(cred);
1043         if (IS_ERR(state)) {
1044                 switch (PTR_ERR(state)) {
1045                         case -EPERM:
1046                         case -EACCES:
1047                         case -EDQUOT:
1048                         case -ENOSPC:
1049                         case -EROFS:
1050                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1051                                 return 1;
1052                         case -ENOENT:
1053                                 if (dentry->d_inode == NULL)
1054                                         return 1;
1055                 }
1056                 goto out_drop;
1057         }
1058         inode = state->inode;
1059         iput(inode);
1060         if (inode == dentry->d_inode) {
1061                 nfs4_intent_set_file(nd, dentry, state);
1062                 return 1;
1063         }
1064         nfs4_close_state(state, openflags);
1065 out_drop:
1066         d_drop(dentry);
1067         return 0;
1068 }
1069
1070
1071 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1072 {
1073         struct nfs4_server_caps_res res = {};
1074         struct rpc_message msg = {
1075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1076                 .rpc_argp = fhandle,
1077                 .rpc_resp = &res,
1078         };
1079         int status;
1080
1081         status = rpc_call_sync(server->client, &msg, 0);
1082         if (status == 0) {
1083                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1084                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1085                         server->caps |= NFS_CAP_ACLS;
1086                 if (res.has_links != 0)
1087                         server->caps |= NFS_CAP_HARDLINKS;
1088                 if (res.has_symlinks != 0)
1089                         server->caps |= NFS_CAP_SYMLINKS;
1090                 server->acl_bitmask = res.acl_bitmask;
1091         }
1092         return status;
1093 }
1094
1095 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1096 {
1097         struct nfs4_exception exception = { };
1098         int err;
1099         do {
1100                 err = nfs4_handle_exception(server,
1101                                 _nfs4_server_capabilities(server, fhandle),
1102                                 &exception);
1103         } while (exception.retry);
1104         return err;
1105 }
1106
1107 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1108                 struct nfs_fsinfo *info)
1109 {
1110         struct nfs_fattr *      fattr = info->fattr;
1111         struct nfs4_lookup_root_arg args = {
1112                 .bitmask = nfs4_fattr_bitmap,
1113         };
1114         struct nfs4_lookup_res res = {
1115                 .server = server,
1116                 .fattr = fattr,
1117                 .fh = fhandle,
1118         };
1119         struct rpc_message msg = {
1120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1121                 .rpc_argp = &args,
1122                 .rpc_resp = &res,
1123         };
1124         fattr->valid = 0;
1125         return rpc_call_sync(server->client, &msg, 0);
1126 }
1127
1128 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1129                 struct nfs_fsinfo *info)
1130 {
1131         struct nfs4_exception exception = { };
1132         int err;
1133         do {
1134                 err = nfs4_handle_exception(server,
1135                                 _nfs4_lookup_root(server, fhandle, info),
1136                                 &exception);
1137         } while (exception.retry);
1138         return err;
1139 }
1140
1141 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1142                 struct nfs_fsinfo *info)
1143 {
1144         struct nfs_fattr *      fattr = info->fattr;
1145         unsigned char *         p;
1146         struct qstr             q;
1147         struct nfs4_lookup_arg args = {
1148                 .dir_fh = fhandle,
1149                 .name = &q,
1150                 .bitmask = nfs4_fattr_bitmap,
1151         };
1152         struct nfs4_lookup_res res = {
1153                 .server = server,
1154                 .fattr = fattr,
1155                 .fh = fhandle,
1156         };
1157         struct rpc_message msg = {
1158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1159                 .rpc_argp = &args,
1160                 .rpc_resp = &res,
1161         };
1162         int status;
1163
1164         /*
1165          * Now we do a separate LOOKUP for each component of the mount path.
1166          * The LOOKUPs are done separately so that we can conveniently
1167          * catch an ERR_WRONGSEC if it occurs along the way...
1168          */
1169         status = nfs4_lookup_root(server, fhandle, info);
1170         if (status)
1171                 goto out;
1172
1173         p = server->mnt_path;
1174         for (;;) {
1175                 struct nfs4_exception exception = { };
1176
1177                 while (*p == '/')
1178                         p++;
1179                 if (!*p)
1180                         break;
1181                 q.name = p;
1182                 while (*p && (*p != '/'))
1183                         p++;
1184                 q.len = p - q.name;
1185
1186                 do {
1187                         fattr->valid = 0;
1188                         status = nfs4_handle_exception(server,
1189                                         rpc_call_sync(server->client, &msg, 0),
1190                                         &exception);
1191                 } while (exception.retry);
1192                 if (status == 0)
1193                         continue;
1194                 if (status == -ENOENT) {
1195                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1196                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1197                 }
1198                 break;
1199         }
1200         if (status == 0)
1201                 status = nfs4_server_capabilities(server, fhandle);
1202         if (status == 0)
1203                 status = nfs4_do_fsinfo(server, fhandle, info);
1204 out:
1205         return status;
1206 }
1207
1208 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1209 {
1210         struct nfs4_getattr_arg args = {
1211                 .fh = fhandle,
1212                 .bitmask = server->attr_bitmask,
1213         };
1214         struct nfs4_getattr_res res = {
1215                 .fattr = fattr,
1216                 .server = server,
1217         };
1218         struct rpc_message msg = {
1219                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1220                 .rpc_argp = &args,
1221                 .rpc_resp = &res,
1222         };
1223
1224         fattr->valid = 0;
1225         return rpc_call_sync(server->client, &msg, 0);
1226 }
1227
1228 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1229 {
1230         struct nfs4_exception exception = { };
1231         int err;
1232         do {
1233                 err = nfs4_handle_exception(server,
1234                                 _nfs4_proc_getattr(server, fhandle, fattr),
1235                                 &exception);
1236         } while (exception.retry);
1237         return err;
1238 }
1239
1240 /*
1241  * The file is not closed if it is opened due to the a request to change
1242  * the size of the file. The open call will not be needed once the
1243  * VFS layer lookup-intents are implemented.
1244  *
1245  * Close is called when the inode is destroyed.
1246  * If we haven't opened the file for O_WRONLY, we
1247  * need to in the size_change case to obtain a stateid.
1248  *
1249  * Got race?
1250  * Because OPEN is always done by name in nfsv4, it is
1251  * possible that we opened a different file by the same
1252  * name.  We can recognize this race condition, but we
1253  * can't do anything about it besides returning an error.
1254  *
1255  * This will be fixed with VFS changes (lookup-intent).
1256  */
1257 static int
1258 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1259                   struct iattr *sattr)
1260 {
1261         struct rpc_cred *cred;
1262         struct inode *inode = dentry->d_inode;
1263         struct nfs4_state *state;
1264         int status;
1265
1266         fattr->valid = 0;
1267
1268         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1269         if (IS_ERR(cred))
1270                 return PTR_ERR(cred);
1271         /* Search for an existing WRITE delegation first */
1272         state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1273         if (!IS_ERR(state)) {
1274                 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1275                 iput(inode);
1276         } else {
1277                 /* Search for an existing open(O_WRITE) stateid */
1278                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1279         }
1280
1281         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1282                         NFS_FH(inode), sattr, state);
1283         if (status == 0)
1284                 nfs_setattr_update_inode(inode, sattr);
1285         if (state != NULL)
1286                 nfs4_close_state(state, FMODE_WRITE);
1287         put_rpccred(cred);
1288         return status;
1289 }
1290
1291 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1292                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1293 {
1294         int                    status;
1295         struct nfs_server *server = NFS_SERVER(dir);
1296         struct nfs4_lookup_arg args = {
1297                 .bitmask = server->attr_bitmask,
1298                 .dir_fh = NFS_FH(dir),
1299                 .name = name,
1300         };
1301         struct nfs4_lookup_res res = {
1302                 .server = server,
1303                 .fattr = fattr,
1304                 .fh = fhandle,
1305         };
1306         struct rpc_message msg = {
1307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1308                 .rpc_argp = &args,
1309                 .rpc_resp = &res,
1310         };
1311
1312         fattr->valid = 0;
1313
1314         dprintk("NFS call  lookup %s\n", name->name);
1315         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1316         dprintk("NFS reply lookup: %d\n", status);
1317         return status;
1318 }
1319
1320 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1321 {
1322         struct nfs4_exception exception = { };
1323         int err;
1324         do {
1325                 err = nfs4_handle_exception(NFS_SERVER(dir),
1326                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1327                                 &exception);
1328         } while (exception.retry);
1329         return err;
1330 }
1331
1332 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1333 {
1334         struct nfs4_accessargs args = {
1335                 .fh = NFS_FH(inode),
1336         };
1337         struct nfs4_accessres res = { 0 };
1338         struct rpc_message msg = {
1339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1340                 .rpc_argp = &args,
1341                 .rpc_resp = &res,
1342                 .rpc_cred = entry->cred,
1343         };
1344         int mode = entry->mask;
1345         int status;
1346
1347         /*
1348          * Determine which access bits we want to ask for...
1349          */
1350         if (mode & MAY_READ)
1351                 args.access |= NFS4_ACCESS_READ;
1352         if (S_ISDIR(inode->i_mode)) {
1353                 if (mode & MAY_WRITE)
1354                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1355                 if (mode & MAY_EXEC)
1356                         args.access |= NFS4_ACCESS_LOOKUP;
1357         } else {
1358                 if (mode & MAY_WRITE)
1359                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1360                 if (mode & MAY_EXEC)
1361                         args.access |= NFS4_ACCESS_EXECUTE;
1362         }
1363         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1364         if (!status) {
1365                 entry->mask = 0;
1366                 if (res.access & NFS4_ACCESS_READ)
1367                         entry->mask |= MAY_READ;
1368                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1369                         entry->mask |= MAY_WRITE;
1370                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1371                         entry->mask |= MAY_EXEC;
1372         }
1373         return status;
1374 }
1375
1376 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1377 {
1378         struct nfs4_exception exception = { };
1379         int err;
1380         do {
1381                 err = nfs4_handle_exception(NFS_SERVER(inode),
1382                                 _nfs4_proc_access(inode, entry),
1383                                 &exception);
1384         } while (exception.retry);
1385         return err;
1386 }
1387
1388 /*
1389  * TODO: For the time being, we don't try to get any attributes
1390  * along with any of the zero-copy operations READ, READDIR,
1391  * READLINK, WRITE.
1392  *
1393  * In the case of the first three, we want to put the GETATTR
1394  * after the read-type operation -- this is because it is hard
1395  * to predict the length of a GETATTR response in v4, and thus
1396  * align the READ data correctly.  This means that the GETATTR
1397  * may end up partially falling into the page cache, and we should
1398  * shift it into the 'tail' of the xdr_buf before processing.
1399  * To do this efficiently, we need to know the total length
1400  * of data received, which doesn't seem to be available outside
1401  * of the RPC layer.
1402  *
1403  * In the case of WRITE, we also want to put the GETATTR after
1404  * the operation -- in this case because we want to make sure
1405  * we get the post-operation mtime and size.  This means that
1406  * we can't use xdr_encode_pages() as written: we need a variant
1407  * of it which would leave room in the 'tail' iovec.
1408  *
1409  * Both of these changes to the XDR layer would in fact be quite
1410  * minor, but I decided to leave them for a subsequent patch.
1411  */
1412 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1413                 unsigned int pgbase, unsigned int pglen)
1414 {
1415         struct nfs4_readlink args = {
1416                 .fh       = NFS_FH(inode),
1417                 .pgbase   = pgbase,
1418                 .pglen    = pglen,
1419                 .pages    = &page,
1420         };
1421         struct rpc_message msg = {
1422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1423                 .rpc_argp = &args,
1424                 .rpc_resp = NULL,
1425         };
1426
1427         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1428 }
1429
1430 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1431                 unsigned int pgbase, unsigned int pglen)
1432 {
1433         struct nfs4_exception exception = { };
1434         int err;
1435         do {
1436                 err = nfs4_handle_exception(NFS_SERVER(inode),
1437                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1438                                 &exception);
1439         } while (exception.retry);
1440         return err;
1441 }
1442
1443 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1444 {
1445         int flags = rdata->flags;
1446         struct inode *inode = rdata->inode;
1447         struct nfs_fattr *fattr = rdata->res.fattr;
1448         struct nfs_server *server = NFS_SERVER(inode);
1449         struct rpc_message msg = {
1450                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1451                 .rpc_argp       = &rdata->args,
1452                 .rpc_resp       = &rdata->res,
1453                 .rpc_cred       = rdata->cred,
1454         };
1455         unsigned long timestamp = jiffies;
1456         int status;
1457
1458         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1459                         (long long) rdata->args.offset);
1460
1461         fattr->valid = 0;
1462         status = rpc_call_sync(server->client, &msg, flags);
1463         if (!status)
1464                 renew_lease(server, timestamp);
1465         dprintk("NFS reply read: %d\n", status);
1466         return status;
1467 }
1468
1469 static int nfs4_proc_read(struct nfs_read_data *rdata)
1470 {
1471         struct nfs4_exception exception = { };
1472         int err;
1473         do {
1474                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1475                                 _nfs4_proc_read(rdata),
1476                                 &exception);
1477         } while (exception.retry);
1478         return err;
1479 }
1480
1481 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1482 {
1483         int rpcflags = wdata->flags;
1484         struct inode *inode = wdata->inode;
1485         struct nfs_fattr *fattr = wdata->res.fattr;
1486         struct nfs_server *server = NFS_SERVER(inode);
1487         struct rpc_message msg = {
1488                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1489                 .rpc_argp       = &wdata->args,
1490                 .rpc_resp       = &wdata->res,
1491                 .rpc_cred       = wdata->cred,
1492         };
1493         int status;
1494
1495         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1496                         (long long) wdata->args.offset);
1497
1498         fattr->valid = 0;
1499         status = rpc_call_sync(server->client, &msg, rpcflags);
1500         dprintk("NFS reply write: %d\n", status);
1501         return status;
1502 }
1503
1504 static int nfs4_proc_write(struct nfs_write_data *wdata)
1505 {
1506         struct nfs4_exception exception = { };
1507         int err;
1508         do {
1509                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1510                                 _nfs4_proc_write(wdata),
1511                                 &exception);
1512         } while (exception.retry);
1513         return err;
1514 }
1515
1516 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1517 {
1518         struct inode *inode = cdata->inode;
1519         struct nfs_fattr *fattr = cdata->res.fattr;
1520         struct nfs_server *server = NFS_SERVER(inode);
1521         struct rpc_message msg = {
1522                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1523                 .rpc_argp       = &cdata->args,
1524                 .rpc_resp       = &cdata->res,
1525                 .rpc_cred       = cdata->cred,
1526         };
1527         int status;
1528
1529         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1530                         (long long) cdata->args.offset);
1531
1532         fattr->valid = 0;
1533         status = rpc_call_sync(server->client, &msg, 0);
1534         dprintk("NFS reply commit: %d\n", status);
1535         return status;
1536 }
1537
1538 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1539 {
1540         struct nfs4_exception exception = { };
1541         int err;
1542         do {
1543                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1544                                 _nfs4_proc_commit(cdata),
1545                                 &exception);
1546         } while (exception.retry);
1547         return err;
1548 }
1549
1550 /*
1551  * Got race?
1552  * We will need to arrange for the VFS layer to provide an atomic open.
1553  * Until then, this create/open method is prone to inefficiency and race
1554  * conditions due to the lookup, create, and open VFS calls from sys_open()
1555  * placed on the wire.
1556  *
1557  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1558  * The file will be opened again in the subsequent VFS open call
1559  * (nfs4_proc_file_open).
1560  *
1561  * The open for read will just hang around to be used by any process that
1562  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1563  */
1564
1565 static int
1566 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1567                  int flags, struct nameidata *nd)
1568 {
1569         struct nfs4_state *state;
1570         struct rpc_cred *cred;
1571         int status = 0;
1572
1573         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1574         if (IS_ERR(cred)) {
1575                 status = PTR_ERR(cred);
1576                 goto out;
1577         }
1578         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1579         put_rpccred(cred);
1580         if (IS_ERR(state)) {
1581                 status = PTR_ERR(state);
1582                 goto out;
1583         }
1584         d_instantiate(dentry, state->inode);
1585         if (flags & O_EXCL) {
1586                 struct nfs_fattr fattr;
1587                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1588                                      NFS_FH(state->inode), sattr, state);
1589                 if (status == 0)
1590                         nfs_setattr_update_inode(state->inode, sattr);
1591         }
1592         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1593                 nfs4_intent_set_file(nd, dentry, state);
1594         else
1595                 nfs4_close_state(state, flags);
1596 out:
1597         return status;
1598 }
1599
1600 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1601 {
1602         struct nfs4_remove_arg args = {
1603                 .fh = NFS_FH(dir),
1604                 .name = name,
1605         };
1606         struct nfs4_change_info res;
1607         struct rpc_message msg = {
1608                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1609                 .rpc_argp       = &args,
1610                 .rpc_resp       = &res,
1611         };
1612         int                     status;
1613
1614         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1615         if (status == 0)
1616                 update_changeattr(dir, &res);
1617         return status;
1618 }
1619
1620 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1621 {
1622         struct nfs4_exception exception = { };
1623         int err;
1624         do {
1625                 err = nfs4_handle_exception(NFS_SERVER(dir),
1626                                 _nfs4_proc_remove(dir, name),
1627                                 &exception);
1628         } while (exception.retry);
1629         return err;
1630 }
1631
1632 struct unlink_desc {
1633         struct nfs4_remove_arg  args;
1634         struct nfs4_change_info res;
1635 };
1636
1637 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1638                 struct qstr *name)
1639 {
1640         struct unlink_desc *up;
1641
1642         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1643         if (!up)
1644                 return -ENOMEM;
1645
1646         up->args.fh = NFS_FH(dir->d_inode);
1647         up->args.name = name;
1648
1649         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1650         msg->rpc_argp = &up->args;
1651         msg->rpc_resp = &up->res;
1652         return 0;
1653 }
1654
1655 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1656 {
1657         struct rpc_message *msg = &task->tk_msg;
1658         struct unlink_desc *up;
1659
1660         if (msg->rpc_resp != NULL) {
1661                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1662                 update_changeattr(dir->d_inode, &up->res);
1663                 kfree(up);
1664                 msg->rpc_resp = NULL;
1665                 msg->rpc_argp = NULL;
1666         }
1667         return 0;
1668 }
1669
1670 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1671                 struct inode *new_dir, struct qstr *new_name)
1672 {
1673         struct nfs4_rename_arg arg = {
1674                 .old_dir = NFS_FH(old_dir),
1675                 .new_dir = NFS_FH(new_dir),
1676                 .old_name = old_name,
1677                 .new_name = new_name,
1678         };
1679         struct nfs4_rename_res res = { };
1680         struct rpc_message msg = {
1681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1682                 .rpc_argp = &arg,
1683                 .rpc_resp = &res,
1684         };
1685         int                     status;
1686
1687         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1688
1689         if (!status) {
1690                 update_changeattr(old_dir, &res.old_cinfo);
1691                 update_changeattr(new_dir, &res.new_cinfo);
1692         }
1693         return status;
1694 }
1695
1696 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1697                 struct inode *new_dir, struct qstr *new_name)
1698 {
1699         struct nfs4_exception exception = { };
1700         int err;
1701         do {
1702                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1703                                 _nfs4_proc_rename(old_dir, old_name,
1704                                         new_dir, new_name),
1705                                 &exception);
1706         } while (exception.retry);
1707         return err;
1708 }
1709
1710 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1711 {
1712         struct nfs4_link_arg arg = {
1713                 .fh     = NFS_FH(inode),
1714                 .dir_fh = NFS_FH(dir),
1715                 .name   = name,
1716         };
1717         struct nfs4_change_info cinfo = { };
1718         struct rpc_message msg = {
1719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1720                 .rpc_argp = &arg,
1721                 .rpc_resp = &cinfo,
1722         };
1723         int                     status;
1724
1725         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1726         if (!status)
1727                 update_changeattr(dir, &cinfo);
1728
1729         return status;
1730 }
1731
1732 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1733 {
1734         struct nfs4_exception exception = { };
1735         int err;
1736         do {
1737                 err = nfs4_handle_exception(NFS_SERVER(inode),
1738                                 _nfs4_proc_link(inode, dir, name),
1739                                 &exception);
1740         } while (exception.retry);
1741         return err;
1742 }
1743
1744 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1745                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1746                 struct nfs_fattr *fattr)
1747 {
1748         struct nfs_server *server = NFS_SERVER(dir);
1749         struct nfs4_create_arg arg = {
1750                 .dir_fh = NFS_FH(dir),
1751                 .server = server,
1752                 .name = name,
1753                 .attrs = sattr,
1754                 .ftype = NF4LNK,
1755                 .bitmask = server->attr_bitmask,
1756         };
1757         struct nfs4_create_res res = {
1758                 .server = server,
1759                 .fh = fhandle,
1760                 .fattr = fattr,
1761         };
1762         struct rpc_message msg = {
1763                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1764                 .rpc_argp = &arg,
1765                 .rpc_resp = &res,
1766         };
1767         int                     status;
1768
1769         if (path->len > NFS4_MAXPATHLEN)
1770                 return -ENAMETOOLONG;
1771         arg.u.symlink = path;
1772         fattr->valid = 0;
1773
1774         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1775         if (!status)
1776                 update_changeattr(dir, &res.dir_cinfo);
1777         return status;
1778 }
1779
1780 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1781                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1782                 struct nfs_fattr *fattr)
1783 {
1784         struct nfs4_exception exception = { };
1785         int err;
1786         do {
1787                 err = nfs4_handle_exception(NFS_SERVER(dir),
1788                                 _nfs4_proc_symlink(dir, name, path, sattr,
1789                                         fhandle, fattr),
1790                                 &exception);
1791         } while (exception.retry);
1792         return err;
1793 }
1794
1795 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1796                 struct iattr *sattr)
1797 {
1798         struct nfs_server *server = NFS_SERVER(dir);
1799         struct nfs_fh fhandle;
1800         struct nfs_fattr fattr;
1801         struct nfs4_create_arg arg = {
1802                 .dir_fh = NFS_FH(dir),
1803                 .server = server,
1804                 .name = &dentry->d_name,
1805                 .attrs = sattr,
1806                 .ftype = NF4DIR,
1807                 .bitmask = server->attr_bitmask,
1808         };
1809         struct nfs4_create_res res = {
1810                 .server = server,
1811                 .fh = &fhandle,
1812                 .fattr = &fattr,
1813         };
1814         struct rpc_message msg = {
1815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1816                 .rpc_argp = &arg,
1817                 .rpc_resp = &res,
1818         };
1819         int                     status;
1820
1821         fattr.valid = 0;
1822
1823         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1824         if (!status) {
1825                 update_changeattr(dir, &res.dir_cinfo);
1826                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1827         }
1828         return status;
1829 }
1830
1831 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1832                 struct iattr *sattr)
1833 {
1834         struct nfs4_exception exception = { };
1835         int err;
1836         do {
1837                 err = nfs4_handle_exception(NFS_SERVER(dir),
1838                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1839                                 &exception);
1840         } while (exception.retry);
1841         return err;
1842 }
1843
1844 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1845                   u64 cookie, struct page *page, unsigned int count, int plus)
1846 {
1847         struct inode            *dir = dentry->d_inode;
1848         struct nfs4_readdir_arg args = {
1849                 .fh = NFS_FH(dir),
1850                 .pages = &page,
1851                 .pgbase = 0,
1852                 .count = count,
1853                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1854         };
1855         struct nfs4_readdir_res res;
1856         struct rpc_message msg = {
1857                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1858                 .rpc_argp = &args,
1859                 .rpc_resp = &res,
1860                 .rpc_cred = cred,
1861         };
1862         int                     status;
1863
1864         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1865                         dentry->d_parent->d_name.name,
1866                         dentry->d_name.name,
1867                         (unsigned long long)cookie);
1868         lock_kernel();
1869         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1870         res.pgbase = args.pgbase;
1871         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1872         if (status == 0)
1873                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1874         unlock_kernel();
1875         dprintk("%s: returns %d\n", __FUNCTION__, status);
1876         return status;
1877 }
1878
1879 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1880                   u64 cookie, struct page *page, unsigned int count, int plus)
1881 {
1882         struct nfs4_exception exception = { };
1883         int err;
1884         do {
1885                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1886                                 _nfs4_proc_readdir(dentry, cred, cookie,
1887                                         page, count, plus),
1888                                 &exception);
1889         } while (exception.retry);
1890         return err;
1891 }
1892
1893 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1894                 struct iattr *sattr, dev_t rdev)
1895 {
1896         struct nfs_server *server = NFS_SERVER(dir);
1897         struct nfs_fh fh;
1898         struct nfs_fattr fattr;
1899         struct nfs4_create_arg arg = {
1900                 .dir_fh = NFS_FH(dir),
1901                 .server = server,
1902                 .name = &dentry->d_name,
1903                 .attrs = sattr,
1904                 .bitmask = server->attr_bitmask,
1905         };
1906         struct nfs4_create_res res = {
1907                 .server = server,
1908                 .fh = &fh,
1909                 .fattr = &fattr,
1910         };
1911         struct rpc_message msg = {
1912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1913                 .rpc_argp = &arg,
1914                 .rpc_resp = &res,
1915         };
1916         int                     status;
1917         int                     mode = sattr->ia_mode;
1918
1919         fattr.valid = 0;
1920
1921         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1922         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1923         if (S_ISFIFO(mode))
1924                 arg.ftype = NF4FIFO;
1925         else if (S_ISBLK(mode)) {
1926                 arg.ftype = NF4BLK;
1927                 arg.u.device.specdata1 = MAJOR(rdev);
1928                 arg.u.device.specdata2 = MINOR(rdev);
1929         }
1930         else if (S_ISCHR(mode)) {
1931                 arg.ftype = NF4CHR;
1932                 arg.u.device.specdata1 = MAJOR(rdev);
1933                 arg.u.device.specdata2 = MINOR(rdev);
1934         }
1935         else
1936                 arg.ftype = NF4SOCK;
1937
1938         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1939         if (status == 0) {
1940                 update_changeattr(dir, &res.dir_cinfo);
1941                 status = nfs_instantiate(dentry, &fh, &fattr);
1942         }
1943         return status;
1944 }
1945
1946 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1947                 struct iattr *sattr, dev_t rdev)
1948 {
1949         struct nfs4_exception exception = { };
1950         int err;
1951         do {
1952                 err = nfs4_handle_exception(NFS_SERVER(dir),
1953                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1954                                 &exception);
1955         } while (exception.retry);
1956         return err;
1957 }
1958
1959 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1960                  struct nfs_fsstat *fsstat)
1961 {
1962         struct nfs4_statfs_arg args = {
1963                 .fh = fhandle,
1964                 .bitmask = server->attr_bitmask,
1965         };
1966         struct rpc_message msg = {
1967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1968                 .rpc_argp = &args,
1969                 .rpc_resp = fsstat,
1970         };
1971
1972         fsstat->fattr->valid = 0;
1973         return rpc_call_sync(server->client, &msg, 0);
1974 }
1975
1976 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1977 {
1978         struct nfs4_exception exception = { };
1979         int err;
1980         do {
1981                 err = nfs4_handle_exception(server,
1982                                 _nfs4_proc_statfs(server, fhandle, fsstat),
1983                                 &exception);
1984         } while (exception.retry);
1985         return err;
1986 }
1987
1988 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1989                 struct nfs_fsinfo *fsinfo)
1990 {
1991         struct nfs4_fsinfo_arg args = {
1992                 .fh = fhandle,
1993                 .bitmask = server->attr_bitmask,
1994         };
1995         struct rpc_message msg = {
1996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1997                 .rpc_argp = &args,
1998                 .rpc_resp = fsinfo,
1999         };
2000
2001         return rpc_call_sync(server->client, &msg, 0);
2002 }
2003
2004 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2005 {
2006         struct nfs4_exception exception = { };
2007         int err;
2008
2009         do {
2010                 err = nfs4_handle_exception(server,
2011                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2012                                 &exception);
2013         } while (exception.retry);
2014         return err;
2015 }
2016
2017 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2018 {
2019         fsinfo->fattr->valid = 0;
2020         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2021 }
2022
2023 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2024                 struct nfs_pathconf *pathconf)
2025 {
2026         struct nfs4_pathconf_arg args = {
2027                 .fh = fhandle,
2028                 .bitmask = server->attr_bitmask,
2029         };
2030         struct rpc_message msg = {
2031                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2032                 .rpc_argp = &args,
2033                 .rpc_resp = pathconf,
2034         };
2035
2036         /* None of the pathconf attributes are mandatory to implement */
2037         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2038                 memset(pathconf, 0, sizeof(*pathconf));
2039                 return 0;
2040         }
2041
2042         pathconf->fattr->valid = 0;
2043         return rpc_call_sync(server->client, &msg, 0);
2044 }
2045
2046 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2047                 struct nfs_pathconf *pathconf)
2048 {
2049         struct nfs4_exception exception = { };
2050         int err;
2051
2052         do {
2053                 err = nfs4_handle_exception(server,
2054                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2055                                 &exception);
2056         } while (exception.retry);
2057         return err;
2058 }
2059
2060 static void
2061 nfs4_read_done(struct rpc_task *task)
2062 {
2063         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2064         struct inode *inode = data->inode;
2065
2066         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2067                 rpc_restart_call(task);
2068                 return;
2069         }
2070         if (task->tk_status > 0)
2071                 renew_lease(NFS_SERVER(inode), data->timestamp);
2072         /* Call back common NFS readpage processing */
2073         nfs_readpage_result(task);
2074 }
2075
2076 static void
2077 nfs4_proc_read_setup(struct nfs_read_data *data)
2078 {
2079         struct rpc_task *task = &data->task;
2080         struct rpc_message msg = {
2081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2082                 .rpc_argp = &data->args,
2083                 .rpc_resp = &data->res,
2084                 .rpc_cred = data->cred,
2085         };
2086         struct inode *inode = data->inode;
2087         int flags;
2088
2089         data->timestamp   = jiffies;
2090
2091         /* N.B. Do we need to test? Never called for swapfile inode */
2092         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2093
2094         /* Finalize the task. */
2095         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2096         rpc_call_setup(task, &msg, 0);
2097 }
2098
2099 static void
2100 nfs4_write_done(struct rpc_task *task)
2101 {
2102         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2103         struct inode *inode = data->inode;
2104
2105         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2106                 rpc_restart_call(task);
2107                 return;
2108         }
2109         if (task->tk_status >= 0)
2110                 renew_lease(NFS_SERVER(inode), data->timestamp);
2111         /* Call back common NFS writeback processing */
2112         nfs_writeback_done(task);
2113 }
2114
2115 static void
2116 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2117 {
2118         struct rpc_task *task = &data->task;
2119         struct rpc_message msg = {
2120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2121                 .rpc_argp = &data->args,
2122                 .rpc_resp = &data->res,
2123                 .rpc_cred = data->cred,
2124         };
2125         struct inode *inode = data->inode;
2126         int stable;
2127         int flags;
2128
2129         if (how & FLUSH_STABLE) {
2130                 if (!NFS_I(inode)->ncommit)
2131                         stable = NFS_FILE_SYNC;
2132                 else
2133                         stable = NFS_DATA_SYNC;
2134         } else
2135                 stable = NFS_UNSTABLE;
2136         data->args.stable = stable;
2137
2138         data->timestamp   = jiffies;
2139
2140         /* Set the initial flags for the task.  */
2141         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2142
2143         /* Finalize the task. */
2144         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2145         rpc_call_setup(task, &msg, 0);
2146 }
2147
2148 static void
2149 nfs4_commit_done(struct rpc_task *task)
2150 {
2151         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2152         struct inode *inode = data->inode;
2153
2154         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2155                 rpc_restart_call(task);
2156                 return;
2157         }
2158         /* Call back common NFS writeback processing */
2159         nfs_commit_done(task);
2160 }
2161
2162 static void
2163 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2164 {
2165         struct rpc_task *task = &data->task;
2166         struct rpc_message msg = {
2167                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2168                 .rpc_argp = &data->args,
2169                 .rpc_resp = &data->res,
2170                 .rpc_cred = data->cred,
2171         };
2172         struct inode *inode = data->inode;
2173         int flags;
2174
2175         /* Set the initial flags for the task.  */
2176         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2177
2178         /* Finalize the task. */
2179         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2180         rpc_call_setup(task, &msg, 0);
2181 }
2182
2183 /*
2184  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2185  * standalone procedure for queueing an asynchronous RENEW.
2186  */
2187 static void
2188 renew_done(struct rpc_task *task)
2189 {
2190         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2191         unsigned long timestamp = (unsigned long)task->tk_calldata;
2192
2193         if (task->tk_status < 0) {
2194                 switch (task->tk_status) {
2195                         case -NFS4ERR_STALE_CLIENTID:
2196                         case -NFS4ERR_EXPIRED:
2197                         case -NFS4ERR_CB_PATH_DOWN:
2198                                 nfs4_schedule_state_recovery(clp);
2199                 }
2200                 return;
2201         }
2202         spin_lock(&clp->cl_lock);
2203         if (time_before(clp->cl_last_renewal,timestamp))
2204                 clp->cl_last_renewal = timestamp;
2205         spin_unlock(&clp->cl_lock);
2206 }
2207
2208 int
2209 nfs4_proc_async_renew(struct nfs4_client *clp)
2210 {
2211         struct rpc_message msg = {
2212                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2213                 .rpc_argp       = clp,
2214                 .rpc_cred       = clp->cl_cred,
2215         };
2216
2217         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2218                         renew_done, (void *)jiffies);
2219 }
2220
2221 int
2222 nfs4_proc_renew(struct nfs4_client *clp)
2223 {
2224         struct rpc_message msg = {
2225                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2226                 .rpc_argp       = clp,
2227                 .rpc_cred       = clp->cl_cred,
2228         };
2229         unsigned long now = jiffies;
2230         int status;
2231
2232         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2233         if (status < 0)
2234                 return status;
2235         spin_lock(&clp->cl_lock);
2236         if (time_before(clp->cl_last_renewal,now))
2237                 clp->cl_last_renewal = now;
2238         spin_unlock(&clp->cl_lock);
2239         return 0;
2240 }
2241
2242 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2243 {
2244         return (server->caps & NFS_CAP_ACLS)
2245                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2246                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2247 }
2248
2249 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2250  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2251  * the stack.
2252  */
2253 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2254
2255 static void buf_to_pages(const void *buf, size_t buflen,
2256                 struct page **pages, unsigned int *pgbase)
2257 {
2258         const void *p = buf;
2259
2260         *pgbase = offset_in_page(buf);
2261         p -= *pgbase;
2262         while (p < buf + buflen) {
2263                 *(pages++) = virt_to_page(p);
2264                 p += PAGE_CACHE_SIZE;
2265         }
2266 }
2267
2268 struct nfs4_cached_acl {
2269         int cached;
2270         size_t len;
2271         char data[0];
2272 };
2273
2274 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2275 {
2276         struct nfs_inode *nfsi = NFS_I(inode);
2277
2278         spin_lock(&inode->i_lock);
2279         kfree(nfsi->nfs4_acl);
2280         nfsi->nfs4_acl = acl;
2281         spin_unlock(&inode->i_lock);
2282 }
2283
2284 static void nfs4_zap_acl_attr(struct inode *inode)
2285 {
2286         nfs4_set_cached_acl(inode, NULL);
2287 }
2288
2289 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2290 {
2291         struct nfs_inode *nfsi = NFS_I(inode);
2292         struct nfs4_cached_acl *acl;
2293         int ret = -ENOENT;
2294
2295         spin_lock(&inode->i_lock);
2296         acl = nfsi->nfs4_acl;
2297         if (acl == NULL)
2298                 goto out;
2299         if (buf == NULL) /* user is just asking for length */
2300                 goto out_len;
2301         if (acl->cached == 0)
2302                 goto out;
2303         ret = -ERANGE; /* see getxattr(2) man page */
2304         if (acl->len > buflen)
2305                 goto out;
2306         memcpy(buf, acl->data, acl->len);
2307 out_len:
2308         ret = acl->len;
2309 out:
2310         spin_unlock(&inode->i_lock);
2311         return ret;
2312 }
2313
2314 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2315 {
2316         struct nfs4_cached_acl *acl;
2317
2318         if (buf && acl_len <= PAGE_SIZE) {
2319                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2320                 if (acl == NULL)
2321                         goto out;
2322                 acl->cached = 1;
2323                 memcpy(acl->data, buf, acl_len);
2324         } else {
2325                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2326                 if (acl == NULL)
2327                         goto out;
2328                 acl->cached = 0;
2329         }
2330         acl->len = acl_len;
2331 out:
2332         nfs4_set_cached_acl(inode, acl);
2333 }
2334
2335 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2336 {
2337         struct page *pages[NFS4ACL_MAXPAGES];
2338         struct nfs_getaclargs args = {
2339                 .fh = NFS_FH(inode),
2340                 .acl_pages = pages,
2341                 .acl_len = buflen,
2342         };
2343         size_t resp_len = buflen;
2344         void *resp_buf;
2345         struct rpc_message msg = {
2346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2347                 .rpc_argp = &args,
2348                 .rpc_resp = &resp_len,
2349         };
2350         struct page *localpage = NULL;
2351         int ret;
2352
2353         if (buflen < PAGE_SIZE) {
2354                 /* As long as we're doing a round trip to the server anyway,
2355                  * let's be prepared for a page of acl data. */
2356                 localpage = alloc_page(GFP_KERNEL);
2357                 resp_buf = page_address(localpage);
2358                 if (localpage == NULL)
2359                         return -ENOMEM;
2360                 args.acl_pages[0] = localpage;
2361                 args.acl_pgbase = 0;
2362                 resp_len = args.acl_len = PAGE_SIZE;
2363         } else {
2364                 resp_buf = buf;
2365                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2366         }
2367         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2368         if (ret)
2369                 goto out_free;
2370         if (resp_len > args.acl_len)
2371                 nfs4_write_cached_acl(inode, NULL, resp_len);
2372         else
2373                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2374         if (buf) {
2375                 ret = -ERANGE;
2376                 if (resp_len > buflen)
2377                         goto out_free;
2378                 if (localpage)
2379                         memcpy(buf, resp_buf, resp_len);
2380         }
2381         ret = resp_len;
2382 out_free:
2383         if (localpage)
2384                 __free_page(localpage);
2385         return ret;
2386 }
2387
2388 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2389 {
2390         struct nfs_server *server = NFS_SERVER(inode);
2391         int ret;
2392
2393         if (!nfs4_server_supports_acls(server))
2394                 return -EOPNOTSUPP;
2395         ret = nfs_revalidate_inode(server, inode);
2396         if (ret < 0)
2397                 return ret;
2398         ret = nfs4_read_cached_acl(inode, buf, buflen);
2399         if (ret != -ENOENT)
2400                 return ret;
2401         return nfs4_get_acl_uncached(inode, buf, buflen);
2402 }
2403
2404 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2405 {
2406         struct nfs_server *server = NFS_SERVER(inode);
2407         struct page *pages[NFS4ACL_MAXPAGES];
2408         struct nfs_setaclargs arg = {
2409                 .fh             = NFS_FH(inode),
2410                 .acl_pages      = pages,
2411                 .acl_len        = buflen,
2412         };
2413         struct rpc_message msg = {
2414                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2415                 .rpc_argp       = &arg,
2416                 .rpc_resp       = NULL,
2417         };
2418         int ret;
2419
2420         if (!nfs4_server_supports_acls(server))
2421                 return -EOPNOTSUPP;
2422         nfs_inode_return_delegation(inode);
2423         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2424         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2425         if (ret == 0)
2426                 nfs4_write_cached_acl(inode, buf, buflen);
2427         return ret;
2428 }
2429
2430 static int
2431 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2432 {
2433         struct nfs4_client *clp = server->nfs4_state;
2434
2435         if (!clp || task->tk_status >= 0)
2436                 return 0;
2437         switch(task->tk_status) {
2438                 case -NFS4ERR_STALE_CLIENTID:
2439                 case -NFS4ERR_STALE_STATEID:
2440                 case -NFS4ERR_EXPIRED:
2441                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2442                         nfs4_schedule_state_recovery(clp);
2443                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2444                                 rpc_wake_up_task(task);
2445                         task->tk_status = 0;
2446                         return -EAGAIN;
2447                 case -NFS4ERR_GRACE:
2448                 case -NFS4ERR_DELAY:
2449                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2450                         task->tk_status = 0;
2451                         return -EAGAIN;
2452                 case -NFS4ERR_OLD_STATEID:
2453                         task->tk_status = 0;
2454                         return -EAGAIN;
2455         }
2456         task->tk_status = nfs4_map_errors(task->tk_status);
2457         return 0;
2458 }
2459
2460 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2461 {
2462         DEFINE_WAIT(wait);
2463         sigset_t oldset;
2464         int interruptible, res = 0;
2465
2466         might_sleep();
2467
2468         rpc_clnt_sigmask(clnt, &oldset);
2469         interruptible = TASK_UNINTERRUPTIBLE;
2470         if (clnt->cl_intr)
2471                 interruptible = TASK_INTERRUPTIBLE;
2472         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2473         nfs4_schedule_state_recovery(clp);
2474         if (clnt->cl_intr && signalled())
2475                 res = -ERESTARTSYS;
2476         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2477                 schedule();
2478         finish_wait(&clp->cl_waitq, &wait);
2479         rpc_clnt_sigunmask(clnt, &oldset);
2480         return res;
2481 }
2482
2483 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2484 {
2485         sigset_t oldset;
2486         int res = 0;
2487
2488         might_sleep();
2489
2490         if (*timeout <= 0)
2491                 *timeout = NFS4_POLL_RETRY_MIN;
2492         if (*timeout > NFS4_POLL_RETRY_MAX)
2493                 *timeout = NFS4_POLL_RETRY_MAX;
2494         rpc_clnt_sigmask(clnt, &oldset);
2495         if (clnt->cl_intr) {
2496                 schedule_timeout_interruptible(*timeout);
2497                 if (signalled())
2498                         res = -ERESTARTSYS;
2499         } else
2500                 schedule_timeout_uninterruptible(*timeout);
2501         rpc_clnt_sigunmask(clnt, &oldset);
2502         *timeout <<= 1;
2503         return res;
2504 }
2505
2506 /* This is the error handling routine for processes that are allowed
2507  * to sleep.
2508  */
2509 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2510 {
2511         struct nfs4_client *clp = server->nfs4_state;
2512         int ret = errorcode;
2513
2514         exception->retry = 0;
2515         switch(errorcode) {
2516                 case 0:
2517                         return 0;
2518                 case -NFS4ERR_STALE_CLIENTID:
2519                 case -NFS4ERR_STALE_STATEID:
2520                 case -NFS4ERR_EXPIRED:
2521                         ret = nfs4_wait_clnt_recover(server->client, clp);
2522                         if (ret == 0)
2523                                 exception->retry = 1;
2524                         break;
2525                 case -NFS4ERR_GRACE:
2526                 case -NFS4ERR_DELAY:
2527                         ret = nfs4_delay(server->client, &exception->timeout);
2528                         if (ret == 0)
2529                                 exception->retry = 1;
2530                         break;
2531                 case -NFS4ERR_OLD_STATEID:
2532                         if (ret == 0)
2533                                 exception->retry = 1;
2534         }
2535         /* We failed to handle the error */
2536         return nfs4_map_errors(ret);
2537 }
2538
2539 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2540 {
2541         nfs4_verifier sc_verifier;
2542         struct nfs4_setclientid setclientid = {
2543                 .sc_verifier = &sc_verifier,
2544                 .sc_prog = program,
2545         };
2546         struct rpc_message msg = {
2547                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2548                 .rpc_argp = &setclientid,
2549                 .rpc_resp = clp,
2550                 .rpc_cred = clp->cl_cred,
2551         };
2552         u32 *p;
2553         int loop = 0;
2554         int status;
2555
2556         p = (u32*)sc_verifier.data;
2557         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2558         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2559
2560         for(;;) {
2561                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2562                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2563                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2564                                 clp->cl_cred->cr_ops->cr_name,
2565                                 clp->cl_id_uniquifier);
2566                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2567                                 sizeof(setclientid.sc_netid), "tcp");
2568                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2569                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2570                                 clp->cl_ipaddr, port >> 8, port & 255);
2571
2572                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2573                 if (status != -NFS4ERR_CLID_INUSE)
2574                         break;
2575                 if (signalled())
2576                         break;
2577                 if (loop++ & 1)
2578                         ssleep(clp->cl_lease_time + 1);
2579                 else
2580                         if (++clp->cl_id_uniquifier == 0)
2581                                 break;
2582         }
2583         return status;
2584 }
2585
2586 int
2587 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2588 {
2589         struct nfs_fsinfo fsinfo;
2590         struct rpc_message msg = {
2591                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2592                 .rpc_argp = clp,
2593                 .rpc_resp = &fsinfo,
2594                 .rpc_cred = clp->cl_cred,
2595         };
2596         unsigned long now;
2597         int status;
2598
2599         now = jiffies;
2600         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2601         if (status == 0) {
2602                 spin_lock(&clp->cl_lock);
2603                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2604                 clp->cl_last_renewal = now;
2605                 spin_unlock(&clp->cl_lock);
2606         }
2607         return status;
2608 }
2609
2610 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2611 {
2612         struct nfs4_delegreturnargs args = {
2613                 .fhandle = NFS_FH(inode),
2614                 .stateid = stateid,
2615         };
2616         struct rpc_message msg = {
2617                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2618                 .rpc_argp = &args,
2619                 .rpc_cred = cred,
2620         };
2621
2622         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2623 }
2624
2625 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2626 {
2627         struct nfs_server *server = NFS_SERVER(inode);
2628         struct nfs4_exception exception = { };
2629         int err;
2630         do {
2631                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2632                 switch (err) {
2633                         case -NFS4ERR_STALE_STATEID:
2634                         case -NFS4ERR_EXPIRED:
2635                                 nfs4_schedule_state_recovery(server->nfs4_state);
2636                         case 0:
2637                                 return 0;
2638                 }
2639                 err = nfs4_handle_exception(server, err, &exception);
2640         } while (exception.retry);
2641         return err;
2642 }
2643
2644 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2645 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2646
2647 /*
2648  * sleep, with exponential backoff, and retry the LOCK operation.
2649  */
2650 static unsigned long
2651 nfs4_set_lock_task_retry(unsigned long timeout)
2652 {
2653         schedule_timeout_interruptible(timeout);
2654         timeout <<= 1;
2655         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2656                 return NFS4_LOCK_MAXTIMEOUT;
2657         return timeout;
2658 }
2659
2660 static inline int
2661 nfs4_lck_type(int cmd, struct file_lock *request)
2662 {
2663         /* set lock type */
2664         switch (request->fl_type) {
2665                 case F_RDLCK:
2666                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2667                 case F_WRLCK:
2668                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2669                 case F_UNLCK:
2670                         return NFS4_WRITE_LT;
2671         }
2672         BUG();
2673         return 0;
2674 }
2675
2676 static inline uint64_t
2677 nfs4_lck_length(struct file_lock *request)
2678 {
2679         if (request->fl_end == OFFSET_MAX)
2680                 return ~(uint64_t)0;
2681         return request->fl_end - request->fl_start + 1;
2682 }
2683
2684 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2685 {
2686         struct inode *inode = state->inode;
2687         struct nfs_server *server = NFS_SERVER(inode);
2688         struct nfs4_client *clp = server->nfs4_state;
2689         struct nfs_lockargs arg = {
2690                 .fh = NFS_FH(inode),
2691                 .type = nfs4_lck_type(cmd, request),
2692                 .offset = request->fl_start,
2693                 .length = nfs4_lck_length(request),
2694         };
2695         struct nfs_lockres res = {
2696                 .server = server,
2697         };
2698         struct rpc_message msg = {
2699                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2700                 .rpc_argp       = &arg,
2701                 .rpc_resp       = &res,
2702                 .rpc_cred       = state->owner->so_cred,
2703         };
2704         struct nfs_lowner nlo;
2705         struct nfs4_lock_state *lsp;
2706         int status;
2707
2708         down_read(&clp->cl_sem);
2709         nlo.clientid = clp->cl_clientid;
2710         status = nfs4_set_lock_state(state, request);
2711         if (status != 0)
2712                 goto out;
2713         lsp = request->fl_u.nfs4_fl.owner;
2714         nlo.id = lsp->ls_id;
2715         arg.u.lockt = &nlo;
2716         status = rpc_call_sync(server->client, &msg, 0);
2717         if (!status) {
2718                 request->fl_type = F_UNLCK;
2719         } else if (status == -NFS4ERR_DENIED) {
2720                 int64_t len, start, end;
2721                 start = res.u.denied.offset;
2722                 len = res.u.denied.length;
2723                 end = start + len - 1;
2724                 if (end < 0 || len == 0)
2725                         request->fl_end = OFFSET_MAX;
2726                 else
2727                         request->fl_end = (loff_t)end;
2728                 request->fl_start = (loff_t)start;
2729                 request->fl_type = F_WRLCK;
2730                 if (res.u.denied.type & 1)
2731                         request->fl_type = F_RDLCK;
2732                 request->fl_pid = 0;
2733                 status = 0;
2734         }
2735 out:
2736         up_read(&clp->cl_sem);
2737         return status;
2738 }
2739
2740 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2741 {
2742         struct nfs4_exception exception = { };
2743         int err;
2744
2745         do {
2746                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2747                                 _nfs4_proc_getlk(state, cmd, request),
2748                                 &exception);
2749         } while (exception.retry);
2750         return err;
2751 }
2752
2753 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2754 {
2755         int res = 0;
2756         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2757                 case FL_POSIX:
2758                         res = posix_lock_file_wait(file, fl);
2759                         break;
2760                 case FL_FLOCK:
2761                         res = flock_lock_file_wait(file, fl);
2762                         break;
2763                 default:
2764                         BUG();
2765         }
2766         if (res < 0)
2767                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2768                                 __FUNCTION__);
2769         return res;
2770 }
2771
2772 struct nfs4_unlockdata {
2773         struct nfs_lockargs arg;
2774         struct nfs_locku_opargs luargs;
2775         struct nfs_lockres res;
2776         struct nfs4_lock_state *lsp;
2777         struct nfs_open_context *ctx;
2778         atomic_t refcount;
2779         struct completion completion;
2780 };
2781
2782 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2783 {
2784         if (atomic_dec_and_test(&calldata->refcount)) {
2785                 nfs_free_seqid(calldata->luargs.seqid);
2786                 nfs4_put_lock_state(calldata->lsp);
2787                 put_nfs_open_context(calldata->ctx);
2788                 kfree(calldata);
2789         }
2790 }
2791
2792 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2793 {
2794         complete(&calldata->completion);
2795         nfs4_locku_release_calldata(calldata);
2796 }
2797
2798 static void nfs4_locku_done(struct rpc_task *task)
2799 {
2800         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2801
2802         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2803         switch (task->tk_status) {
2804                 case 0:
2805                         memcpy(calldata->lsp->ls_stateid.data,
2806                                         calldata->res.u.stateid.data,
2807                                         sizeof(calldata->lsp->ls_stateid.data));
2808                         break;
2809                 case -NFS4ERR_STALE_STATEID:
2810                 case -NFS4ERR_EXPIRED:
2811                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2812                         break;
2813                 default:
2814                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2815                                 rpc_restart_call(task);
2816                                 return;
2817                         }
2818         }
2819         nfs4_locku_complete(calldata);
2820 }
2821
2822 static void nfs4_locku_begin(struct rpc_task *task)
2823 {
2824         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2825         struct rpc_message msg = {
2826                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2827                 .rpc_argp       = &calldata->arg,
2828                 .rpc_resp       = &calldata->res,
2829                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2830         };
2831         int status;
2832
2833         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2834         if (status != 0)
2835                 return;
2836         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2837                 nfs4_locku_complete(calldata);
2838                 task->tk_exit = NULL;
2839                 rpc_exit(task, 0);
2840                 return;
2841         }
2842         rpc_call_setup(task, &msg, 0);
2843 }
2844
2845 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2846 {
2847         struct nfs4_unlockdata *calldata;
2848         struct inode *inode = state->inode;
2849         struct nfs_server *server = NFS_SERVER(inode);
2850         struct nfs4_lock_state *lsp;
2851         int status;
2852
2853         status = nfs4_set_lock_state(state, request);
2854         if (status != 0)
2855                 return status;
2856         lsp = request->fl_u.nfs4_fl.owner;
2857         /* We might have lost the locks! */
2858         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2859                 return 0;
2860         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2861         if (calldata == NULL)
2862                 return -ENOMEM;
2863         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2864         if (calldata->luargs.seqid == NULL) {
2865                 kfree(calldata);
2866                 return -ENOMEM;
2867         }
2868         calldata->luargs.stateid = &lsp->ls_stateid;
2869         calldata->arg.fh = NFS_FH(inode);
2870         calldata->arg.type = nfs4_lck_type(cmd, request);
2871         calldata->arg.offset = request->fl_start;
2872         calldata->arg.length = nfs4_lck_length(request);
2873         calldata->arg.u.locku = &calldata->luargs;
2874         calldata->res.server = server;
2875         calldata->lsp = lsp;
2876         atomic_inc(&lsp->ls_count);
2877
2878         /* Ensure we don't close file until we're done freeing locks! */
2879         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2880
2881         atomic_set(&calldata->refcount, 2);
2882         init_completion(&calldata->completion);
2883
2884         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2885                         nfs4_locku_done, calldata);
2886         if (status == 0)
2887                 wait_for_completion_interruptible(&calldata->completion);
2888         do_vfs_lock(request->fl_file, request);
2889         nfs4_locku_release_calldata(calldata);
2890         return status;
2891 }
2892
2893 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2894 {
2895         struct inode *inode = state->inode;
2896         struct nfs_server *server = NFS_SERVER(inode);
2897         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2898         struct nfs_lock_opargs largs = {
2899                 .lock_stateid = &lsp->ls_stateid,
2900                 .open_stateid = &state->stateid,
2901                 .lock_owner = {
2902                         .clientid = server->nfs4_state->cl_clientid,
2903                         .id = lsp->ls_id,
2904                 },
2905                 .reclaim = reclaim,
2906         };
2907         struct nfs_lockargs arg = {
2908                 .fh = NFS_FH(inode),
2909                 .type = nfs4_lck_type(cmd, request),
2910                 .offset = request->fl_start,
2911                 .length = nfs4_lck_length(request),
2912                 .u = {
2913                         .lock = &largs,
2914                 },
2915         };
2916         struct nfs_lockres res = {
2917                 .server = server,
2918         };
2919         struct rpc_message msg = {
2920                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2921                 .rpc_argp       = &arg,
2922                 .rpc_resp       = &res,
2923                 .rpc_cred       = state->owner->so_cred,
2924         };
2925         int status = -ENOMEM;
2926
2927         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2928         if (largs.lock_seqid == NULL)
2929                 return -ENOMEM;
2930         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
2931                 struct nfs4_state_owner *owner = state->owner;
2932
2933                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
2934                 if (largs.open_seqid == NULL)
2935                         goto out;
2936                 largs.new_lock_owner = 1;
2937                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2938                 /* increment open seqid on success, and seqid mutating errors */
2939                 if (largs.new_lock_owner != 0) {
2940                         nfs_increment_open_seqid(status, largs.open_seqid);
2941                         if (status == 0)
2942                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
2943                 }
2944                 nfs_free_seqid(largs.open_seqid);
2945         } else
2946                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2947         /* increment lock seqid on success, and seqid mutating errors*/
2948         nfs_increment_lock_seqid(status, largs.lock_seqid);
2949         /* save the returned stateid. */
2950         if (status == 0) {
2951                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
2952                                 sizeof(lsp->ls_stateid.data));
2953                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2954         } else if (status == -NFS4ERR_DENIED)
2955                 status = -EAGAIN;
2956 out:
2957         nfs_free_seqid(largs.lock_seqid);
2958         return status;
2959 }
2960
2961 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2962 {
2963         struct nfs_server *server = NFS_SERVER(state->inode);
2964         struct nfs4_exception exception = { };
2965         int err;
2966
2967         do {
2968                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
2969                 if (err != -NFS4ERR_DELAY)
2970                         break;
2971                 nfs4_handle_exception(server, err, &exception);
2972         } while (exception.retry);
2973         return err;
2974 }
2975
2976 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
2977 {
2978         struct nfs_server *server = NFS_SERVER(state->inode);
2979         struct nfs4_exception exception = { };
2980         int err;
2981
2982         do {
2983                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
2984                 if (err != -NFS4ERR_DELAY)
2985                         break;
2986                 nfs4_handle_exception(server, err, &exception);
2987         } while (exception.retry);
2988         return err;
2989 }
2990
2991 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2992 {
2993         struct nfs4_client *clp = state->owner->so_client;
2994         int status;
2995
2996         down_read(&clp->cl_sem);
2997         status = nfs4_set_lock_state(state, request);
2998         if (status == 0)
2999                 status = _nfs4_do_setlk(state, cmd, request, 0);
3000         if (status == 0) {
3001                 /* Note: we always want to sleep here! */
3002                 request->fl_flags |= FL_SLEEP;
3003                 if (do_vfs_lock(request->fl_file, request) < 0)
3004                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3005         }
3006         up_read(&clp->cl_sem);
3007         return status;
3008 }
3009
3010 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3011 {
3012         struct nfs4_exception exception = { };
3013         int err;
3014
3015         do {
3016                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3017                                 _nfs4_proc_setlk(state, cmd, request),
3018                                 &exception);
3019         } while (exception.retry);
3020         return err;
3021 }
3022
3023 static int
3024 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3025 {
3026         struct nfs_open_context *ctx;
3027         struct nfs4_state *state;
3028         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3029         int status;
3030
3031         /* verify open state */
3032         ctx = (struct nfs_open_context *)filp->private_data;
3033         state = ctx->state;
3034
3035         if (request->fl_start < 0 || request->fl_end < 0)
3036                 return -EINVAL;
3037
3038         if (IS_GETLK(cmd))
3039                 return nfs4_proc_getlk(state, F_GETLK, request);
3040
3041         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3042                 return -EINVAL;
3043
3044         if (request->fl_type == F_UNLCK)
3045                 return nfs4_proc_unlck(state, cmd, request);
3046
3047         do {
3048                 status = nfs4_proc_setlk(state, cmd, request);
3049                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3050                         break;
3051                 timeout = nfs4_set_lock_task_retry(timeout);
3052                 status = -ERESTARTSYS;
3053                 if (signalled())
3054                         break;
3055         } while(status < 0);
3056         return status;
3057 }
3058
3059
3060 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3061
3062 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3063                 size_t buflen, int flags)
3064 {
3065         struct inode *inode = dentry->d_inode;
3066
3067         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3068                 return -EOPNOTSUPP;
3069
3070         if (!S_ISREG(inode->i_mode) &&
3071             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3072                 return -EPERM;
3073
3074         return nfs4_proc_set_acl(inode, buf, buflen);
3075 }
3076
3077 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3078  * and that's what we'll do for e.g. user attributes that haven't been set.
3079  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3080  * attributes in kernel-managed attribute namespaces. */
3081 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3082                 size_t buflen)
3083 {
3084         struct inode *inode = dentry->d_inode;
3085
3086         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3087                 return -EOPNOTSUPP;
3088
3089         return nfs4_proc_get_acl(inode, buf, buflen);
3090 }
3091
3092 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3093 {
3094         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3095
3096         if (buf && buflen < len)
3097                 return -ERANGE;
3098         if (buf)
3099                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3100         return len;
3101 }
3102
3103 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3104         .recover_open   = nfs4_open_reclaim,
3105         .recover_lock   = nfs4_lock_reclaim,
3106 };
3107
3108 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3109         .recover_open   = nfs4_open_expired,
3110         .recover_lock   = nfs4_lock_expired,
3111 };
3112
3113 static struct inode_operations nfs4_file_inode_operations = {
3114         .permission     = nfs_permission,
3115         .getattr        = nfs_getattr,
3116         .setattr        = nfs_setattr,
3117         .getxattr       = nfs4_getxattr,
3118         .setxattr       = nfs4_setxattr,
3119         .listxattr      = nfs4_listxattr,
3120 };
3121
3122 struct nfs_rpc_ops      nfs_v4_clientops = {
3123         .version        = 4,                    /* protocol version */
3124         .dentry_ops     = &nfs4_dentry_operations,
3125         .dir_inode_ops  = &nfs4_dir_inode_operations,
3126         .file_inode_ops = &nfs4_file_inode_operations,
3127         .getroot        = nfs4_proc_get_root,
3128         .getattr        = nfs4_proc_getattr,
3129         .setattr        = nfs4_proc_setattr,
3130         .lookup         = nfs4_proc_lookup,
3131         .access         = nfs4_proc_access,
3132         .readlink       = nfs4_proc_readlink,
3133         .read           = nfs4_proc_read,
3134         .write          = nfs4_proc_write,
3135         .commit         = nfs4_proc_commit,
3136         .create         = nfs4_proc_create,
3137         .remove         = nfs4_proc_remove,
3138         .unlink_setup   = nfs4_proc_unlink_setup,
3139         .unlink_done    = nfs4_proc_unlink_done,
3140         .rename         = nfs4_proc_rename,
3141         .link           = nfs4_proc_link,
3142         .symlink        = nfs4_proc_symlink,
3143         .mkdir          = nfs4_proc_mkdir,
3144         .rmdir          = nfs4_proc_remove,
3145         .readdir        = nfs4_proc_readdir,
3146         .mknod          = nfs4_proc_mknod,
3147         .statfs         = nfs4_proc_statfs,
3148         .fsinfo         = nfs4_proc_fsinfo,
3149         .pathconf       = nfs4_proc_pathconf,
3150         .decode_dirent  = nfs4_decode_dirent,
3151         .read_setup     = nfs4_proc_read_setup,
3152         .write_setup    = nfs4_proc_write_setup,
3153         .commit_setup   = nfs4_proc_commit_setup,
3154         .file_open      = nfs_open,
3155         .file_release   = nfs_release,
3156         .lock           = nfs4_proc_lock,
3157         .clear_acl_cache = nfs4_zap_acl_attr,
3158 };
3159
3160 /*
3161  * Local variables:
3162  *  c-basic-offset: 8
3163  * End:
3164  */