fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
  61 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  62 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  63 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  64 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  65 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  66 extern struct rpc_procinfo nfs4_procedures[];
  67
  68 /* Prevent leaks of NFSv4 errors into userland */
  69 int nfs4_map_errors(int err)
  70 {
  71         if (err < -1000) {
  72                 dprintk("%s could not handle NFSv4 error %d\n",
  73                                 __FUNCTION__, -err);
  74                 return -EIO;
  75         }
  76         return err;
  77 }
  78
  79 /*
  80  * This is our standard bitmap for GETATTR requests.
  81  */
  82 const u32 nfs4_fattr_bitmap[2] = {
  83         FATTR4_WORD0_TYPE
  84         | FATTR4_WORD0_CHANGE
  85         | FATTR4_WORD0_SIZE
  86         | FATTR4_WORD0_FSID
  87         | FATTR4_WORD0_FILEID,
  88         FATTR4_WORD1_MODE
  89         | FATTR4_WORD1_NUMLINKS
  90         | FATTR4_WORD1_OWNER
  91         | FATTR4_WORD1_OWNER_GROUP
  92         | FATTR4_WORD1_RAWDEV
  93         | FATTR4_WORD1_SPACE_USED
  94         | FATTR4_WORD1_TIME_ACCESS
  95         | FATTR4_WORD1_TIME_METADATA
  96         | FATTR4_WORD1_TIME_MODIFY
  97 };
  98
  99 const u32 nfs4_statfs_bitmap[2] = {
 100         FATTR4_WORD0_FILES_AVAIL
 101         | FATTR4_WORD0_FILES_FREE
 102         | FATTR4_WORD0_FILES_TOTAL,
 103         FATTR4_WORD1_SPACE_AVAIL
 104         | FATTR4_WORD1_SPACE_FREE
 105         | FATTR4_WORD1_SPACE_TOTAL
 106 };
 107
 108 const u32 nfs4_pathconf_bitmap[2] = {
 109         FATTR4_WORD0_MAXLINK
 110         | FATTR4_WORD0_MAXNAME,
 111         0
 112 };
 113
 114 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 115                         | FATTR4_WORD0_MAXREAD
 116                         | FATTR4_WORD0_MAXWRITE
 117                         | FATTR4_WORD0_LEASE_TIME,
 118                         0
 119 };
 120
 121 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 122                 struct nfs4_readdir_arg *readdir)
 123 {
 124         u32 *start, *p;
 125
 126         BUG_ON(readdir->count < 80);
 127         if (cookie > 2) {
 128                 readdir->cookie = cookie;
 129                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 130                 return;
 131         }
 132
 133         readdir->cookie = 0;
 134         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 135         if (cookie == 2)
 136                 return;
 137
 138         /*
 139          * NFSv4 servers do not return entries for '.' and '..'
 140          * Therefore, we fake these entries here.  We let '.'
 141          * have cookie 0 and '..' have cookie 1.  Note that
 142          * when talking to the server, we always send cookie 0
 143          * instead of 1 or 2.
 144          */
 145         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 146
 147         if (cookie == 0) {
 148                 *p++ = xdr_one;                                  /* next */
 149                 *p++ = xdr_zero;                   /* cookie, first word */
 150                 *p++ = xdr_one;                   /* cookie, second word */
 151                 *p++ = xdr_one;                             /* entry len */
 152                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 153                 p++;
 154                 *p++ = xdr_one;                         /* bitmap length */
 155                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 156                 *p++ = htonl(8);              /* attribute buffer length */
 157                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 158         }
 159
 160         *p++ = xdr_one;                                  /* next */
 161         *p++ = xdr_zero;                   /* cookie, first word */
 162         *p++ = xdr_two;                   /* cookie, second word */
 163         *p++ = xdr_two;                             /* entry len */
 164         memcpy(p, "..\0\0", 4);                         /* entry */
 165         p++;
 166         *p++ = xdr_one;                         /* bitmap length */
 167         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 168         *p++ = htonl(8);              /* attribute buffer length */
 169         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 170
 171         readdir->pgbase = (char *)p - (char *)start;
 172         readdir->count -= readdir->pgbase;
 173         kunmap_atomic(start, KM_USER0);
 174 }
 175
 176 static void
 177 renew_lease(struct nfs_server *server, unsigned long timestamp)
 178 {
 179         struct nfs4_client *clp = server->nfs4_state;
 180         spin_lock(&clp->cl_lock);
 181         if (time_before(clp->cl_last_renewal,timestamp))
 182                 clp->cl_last_renewal = timestamp;
 183         spin_unlock(&clp->cl_lock);
 184 }
 185
 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 187 {
 188         struct nfs_inode *nfsi = NFS_I(inode);
 189
 190         spin_lock(&inode->i_lock);
 191         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 192         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 193                 nfsi->change_attr = cinfo->after;
 194         spin_unlock(&inode->i_lock);
 195 }
 196
 197 /* Helper for asynchronous RPC calls */
 198 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
 199                 rpc_action tk_exit, void *calldata)
 200 {
 201         struct rpc_task *task;
 202
 203         if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
 204                 return -ENOMEM;
 205
 206         task->tk_calldata = calldata;
 207         task->tk_action = tk_begin;
 208         rpc_execute(task);
 209         return 0;
 210 }
 211
 212 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 213 {
 214         struct inode *inode = state->inode;
 215
 216         open_flags &= (FMODE_READ|FMODE_WRITE);
 217         /* Protect against nfs4_find_state() */
 218         spin_lock(&state->owner->so_lock);
 219         spin_lock(&inode->i_lock);
 220         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 221         if ((open_flags & FMODE_WRITE))
 222                 state->nwriters++;
 223         if (open_flags & FMODE_READ)
 224                 state->nreaders++;
 225         nfs4_state_set_mode_locked(state, state->state | open_flags);
 226         spin_unlock(&inode->i_lock);
 227         spin_unlock(&state->owner->so_lock);
 228 }
 229
 230 /*
 231  * OPEN_RECLAIM:
 232  *      reclaim state on the server after a reboot.
 233  */
 234 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 235 {
 236         struct inode *inode = state->inode;
 237         struct nfs_server *server = NFS_SERVER(inode);
 238         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 239         struct nfs_openargs o_arg = {
 240                 .fh = NFS_FH(inode),
 241                 .id = sp->so_id,
 242                 .open_flags = state->state,
 243                 .clientid = server->nfs4_state->cl_clientid,
 244                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 245                 .bitmask = server->attr_bitmask,
 246         };
 247         struct nfs_openres o_res = {
 248                 .server = server,       /* Grrr */
 249         };
 250         struct rpc_message msg = {
 251                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 252                 .rpc_argp       = &o_arg,
 253                 .rpc_resp       = &o_res,
 254                 .rpc_cred       = sp->so_cred,
 255         };
 256         int status;
 257
 258         if (delegation != NULL) {
 259                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 260                         memcpy(&state->stateid, &delegation->stateid,
 261                                         sizeof(state->stateid));
 262                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 263                         return 0;
 264                 }
 265                 o_arg.u.delegation_type = delegation->type;
 266         }
 267         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 268         if (o_arg.seqid == NULL)
 269                 return -ENOMEM;
 270         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 271         /* Confirm the sequence as being established */
 272         nfs_confirm_seqid(&sp->so_seqid, status);
 273         nfs_increment_open_seqid(status, o_arg.seqid);
 274         if (status == 0) {
 275                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 276                 if (o_res.delegation_type != 0) {
 277                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 278                         /* Did the server issue an immediate delegation recall? */
 279                         if (o_res.do_recall)
 280                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 281                 }
 282         }
 283         nfs_free_seqid(o_arg.seqid);
 284         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 285         /* Ensure we update the inode attributes */
 286         NFS_CACHEINV(inode);
 287         return status;
 288 }
 289
 290 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 291 {
 292         struct nfs_server *server = NFS_SERVER(state->inode);
 293         struct nfs4_exception exception = { };
 294         int err;
 295         do {
 296                 err = _nfs4_open_reclaim(sp, state);
 297                 if (err != -NFS4ERR_DELAY)
 298                         break;
 299                 nfs4_handle_exception(server, err, &exception);
 300         } while (exception.retry);
 301         return err;
 302 }
 303
 304 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 305 {
 306         struct nfs4_state_owner  *sp  = state->owner;
 307         struct inode *inode = dentry->d_inode;
 308         struct nfs_server *server = NFS_SERVER(inode);
 309         struct dentry *parent = dget_parent(dentry);
 310         struct nfs_openargs arg = {
 311                 .fh = NFS_FH(parent->d_inode),
 312                 .clientid = server->nfs4_state->cl_clientid,
 313                 .name = &dentry->d_name,
 314                 .id = sp->so_id,
 315                 .server = server,
 316                 .bitmask = server->attr_bitmask,
 317                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 318         };
 319         struct nfs_openres res = {
 320                 .server = server,
 321         };
 322         struct  rpc_message msg = {
 323                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 324                 .rpc_argp       = &arg,
 325                 .rpc_resp       = &res,
 326                 .rpc_cred       = sp->so_cred,
 327         };
 328         int status = 0;
 329
 330         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 331                 goto out;
 332         if (state->state == 0)
 333                 goto out;
 334         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 335         status = -ENOMEM;
 336         if (arg.seqid == NULL)
 337                 goto out;
 338         arg.open_flags = state->state;
 339         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 340         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 341         nfs_increment_open_seqid(status, arg.seqid);
 342         if (status != 0)
 343                 goto out_free;
 344         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 345                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 346                                 sp, &res.stateid, arg.seqid);
 347                 if (status != 0)
 348                         goto out_free;
 349         }
 350         nfs_confirm_seqid(&sp->so_seqid, 0);
 351         if (status >= 0) {
 352                 memcpy(state->stateid.data, res.stateid.data,
 353                                 sizeof(state->stateid.data));
 354                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 355         }
 356 out_free:
 357         nfs_free_seqid(arg.seqid);
 358 out:
 359         dput(parent);
 360         return status;
 361 }
 362
 363 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 364 {
 365         struct nfs4_exception exception = { };
 366         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 367         int err;
 368         do {
 369                 err = _nfs4_open_delegation_recall(dentry, state);
 370                 switch (err) {
 371                         case 0:
 372                                 return err;
 373                         case -NFS4ERR_STALE_CLIENTID:
 374                         case -NFS4ERR_STALE_STATEID:
 375                         case -NFS4ERR_EXPIRED:
 376                                 /* Don't recall a delegation if it was lost */
 377                                 nfs4_schedule_state_recovery(server->nfs4_state);
 378                                 return err;
 379                 }
 380                 err = nfs4_handle_exception(server, err, &exception);
 381         } while (exception.retry);
 382         return err;
 383 }
 384
 385 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)
 386 {
 387         struct nfs_open_confirmargs arg = {
 388                 .fh             = fh,
 389                 .seqid          = seqid,
 390                 .stateid        = *stateid,
 391         };
 392         struct nfs_open_confirmres res;
 393         struct  rpc_message msg = {
 394                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 395                 .rpc_argp       = &arg,
 396                 .rpc_resp       = &res,
 397                 .rpc_cred       = sp->so_cred,
 398         };
 399         int status;
 400
 401         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 402         /* Confirm the sequence as being established */
 403         nfs_confirm_seqid(&sp->so_seqid, status);
 404         nfs_increment_open_seqid(status, seqid);
 405         if (status >= 0)
 406                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 407         return status;
 408 }
 409
 410 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 411 {
 412         struct nfs_server *server = NFS_SERVER(dir);
 413         struct rpc_message msg = {
 414                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 415                 .rpc_argp = o_arg,
 416                 .rpc_resp = o_res,
 417                 .rpc_cred = sp->so_cred,
 418         };
 419         int status;
 420
 421         /* Update sequence id. The caller must serialize! */
 422         o_arg->id = sp->so_id;
 423         o_arg->clientid = sp->so_client->cl_clientid;
 424
 425         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 426         if (status == 0) {
 427                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 428                 switch (o_res->f_attr->mode & S_IFMT) {
 429                         case S_IFREG:
 430                                 break;
 431                         case S_IFLNK:
 432                                 status = -ELOOP;
 433                                 break;
 434                         case S_IFDIR:
 435                                 status = -EISDIR;
 436                                 break;
 437                         default:
 438                                 status = -ENOTDIR;
 439                 }
 440         }
 441
 442         nfs_increment_open_seqid(status, o_arg->seqid);
 443         if (status != 0)
 444                 goto out;
 445         if (o_arg->open_flags & O_CREAT) {
 446                 update_changeattr(dir, &o_res->cinfo);
 447                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 448         } else
 449                 nfs_refresh_inode(dir, o_res->dir_attr);
 450         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 451                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 452                                 sp, &o_res->stateid, o_arg->seqid);
 453                 if (status != 0)
 454                         goto out;
 455         }
 456         nfs_confirm_seqid(&sp->so_seqid, 0);
 457         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 458                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 459 out:
 460         return status;
 461 }
 462
 463 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 464 {
 465         struct nfs_access_entry cache;
 466         int mask = 0;
 467         int status;
 468
 469         if (openflags & FMODE_READ)
 470                 mask |= MAY_READ;
 471         if (openflags & FMODE_WRITE)
 472                 mask |= MAY_WRITE;
 473         status = nfs_access_get_cached(inode, cred, &cache);
 474         if (status == 0)
 475                 goto out;
 476
 477         /* Be clever: ask server to check for all possible rights */
 478         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 479         cache.cred = cred;
 480         cache.jiffies = jiffies;
 481         status = _nfs4_proc_access(inode, &cache);
 482         if (status != 0)
 483                 return status;
 484         nfs_access_add_cache(inode, &cache);
 485 out:
 486         if ((cache.mask & mask) == mask)
 487                 return 0;
 488         return -EACCES;
 489 }
 490
 491 /*
 492  * OPEN_EXPIRED:
 493  *      reclaim state on the server after a network partition.
 494  *      Assumes caller holds the appropriate lock
 495  */
 496 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 497 {
 498         struct dentry *parent = dget_parent(dentry);
 499         struct inode *dir = parent->d_inode;
 500         struct inode *inode = state->inode;
 501         struct nfs_server *server = NFS_SERVER(dir);
 502         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 503         struct nfs_fattr f_attr, dir_attr;
 504         struct nfs_openargs o_arg = {
 505                 .fh = NFS_FH(dir),
 506                 .open_flags = state->state,
 507                 .name = &dentry->d_name,
 508                 .bitmask = server->attr_bitmask,
 509                 .claim = NFS4_OPEN_CLAIM_NULL,
 510         };
 511         struct nfs_openres o_res = {
 512                 .f_attr = &f_attr,
 513                 .dir_attr = &dir_attr,
 514                 .server = server,
 515         };
 516         int status = 0;
 517
 518         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 519                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 520                 if (status < 0)
 521                         goto out;
 522                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 523                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 524                 goto out;
 525         }
 526         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 527         status = -ENOMEM;
 528         if (o_arg.seqid == NULL)
 529                 goto out;
 530         nfs_fattr_init(&f_attr);
 531         nfs_fattr_init(&dir_attr);
 532         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 533         if (status != 0)
 534                 goto out_nodeleg;
 535         /* Check if files differ */
 536         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 537                 goto out_stale;
 538         /* Has the file handle changed? */
 539         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 540                 /* Verify if the change attributes are the same */
 541                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 542                         goto out_stale;
 543                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 544                         goto out_stale;
 545                 /* Lets just pretend that this is the same file */
 546                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 547                 NFS_I(inode)->fileid = f_attr.fileid;
 548         }
 549         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 550         if (o_res.delegation_type != 0) {
 551                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 552                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 553                 else
 554                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 555         }
 556 out_nodeleg:
 557         nfs_free_seqid(o_arg.seqid);
 558         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 559 out:
 560         dput(parent);
 561         return status;
 562 out_stale:
 563         status = -ESTALE;
 564         /* Invalidate the state owner so we don't ever use it again */
 565         nfs4_drop_state_owner(sp);
 566         d_drop(dentry);
 567         /* Should we be trying to close that stateid? */
 568         goto out_nodeleg;
 569 }
 570
 571 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 572 {
 573         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 574         struct nfs4_exception exception = { };
 575         int err;
 576
 577         do {
 578                 err = _nfs4_open_expired(sp, state, dentry);
 579                 if (err == -NFS4ERR_DELAY)
 580                         nfs4_handle_exception(server, err, &exception);
 581         } while (exception.retry);
 582         return err;
 583 }
 584
 585 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 586 {
 587         struct nfs_inode *nfsi = NFS_I(state->inode);
 588         struct nfs_open_context *ctx;
 589         int status;
 590
 591         spin_lock(&state->inode->i_lock);
 592         list_for_each_entry(ctx, &nfsi->open_files, list) {
 593                 if (ctx->state != state)
 594                         continue;
 595                 get_nfs_open_context(ctx);
 596                 spin_unlock(&state->inode->i_lock);
 597                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 598                 put_nfs_open_context(ctx);
 599                 return status;
 600         }
 601         spin_unlock(&state->inode->i_lock);
 602         return -ENOENT;
 603 }
 604
 605 /*
 606  * Returns an nfs4_state + an extra reference to the inode
 607  */
 608 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 609 {
 610         struct nfs_delegation *delegation;
 611         struct nfs_server *server = NFS_SERVER(inode);
 612         struct nfs4_client *clp = server->nfs4_state;
 613         struct nfs_inode *nfsi = NFS_I(inode);
 614         struct nfs4_state_owner *sp = NULL;
 615         struct nfs4_state *state = NULL;
 616         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 617         int err;
 618
 619         /* Protect against reboot recovery - NOTE ORDER! */
 620         down_read(&clp->cl_sem);
 621         /* Protect against delegation recall */
 622         down_read(&nfsi->rwsem);
 623         delegation = NFS_I(inode)->delegation;
 624         err = -ENOENT;
 625         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 626                 goto out_err;
 627         err = -ENOMEM;
 628         if (!(sp = nfs4_get_state_owner(server, cred))) {
 629                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 630                 goto out_err;
 631         }
 632         state = nfs4_get_open_state(inode, sp);
 633         if (state == NULL)
 634                 goto out_err;
 635
 636         err = -ENOENT;
 637         if ((state->state & open_flags) == open_flags) {
 638                 spin_lock(&inode->i_lock);
 639                 if (open_flags & FMODE_READ)
 640                         state->nreaders++;
 641                 if (open_flags & FMODE_WRITE)
 642                         state->nwriters++;
 643                 spin_unlock(&inode->i_lock);
 644                 goto out_ok;
 645         } else if (state->state != 0)
 646                 goto out_err;
 647
 648         lock_kernel();
 649         err = _nfs4_do_access(inode, cred, open_flags);
 650         unlock_kernel();
 651         if (err != 0)
 652                 goto out_err;
 653         set_bit(NFS_DELEGATED_STATE, &state->flags);
 654         update_open_stateid(state, &delegation->stateid, open_flags);
 655 out_ok:
 656         nfs4_put_state_owner(sp);
 657         up_read(&nfsi->rwsem);
 658         up_read(&clp->cl_sem);
 659         igrab(inode);
 660         *res = state;
 661         return 0;
 662 out_err:
 663         if (sp != NULL) {
 664                 if (state != NULL)
 665                         nfs4_put_open_state(state);
 666                 nfs4_put_state_owner(sp);
 667         }
 668         up_read(&nfsi->rwsem);
 669         up_read(&clp->cl_sem);
 670         if (err != -EACCES)
 671                 nfs_inode_return_delegation(inode);
 672         return err;
 673 }
 674
 675 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 676 {
 677         struct nfs4_exception exception = { };
 678         struct nfs4_state *res;
 679         int err;
 680
 681         do {
 682                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 683                 if (err == 0)
 684                         break;
 685                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 686                                         err, &exception));
 687         } while (exception.retry);
 688         return res;
 689 }
 690
 691 /*
 692  * Returns an nfs4_state + an referenced inode
 693  */
 694 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 695 {
 696         struct nfs4_state_owner  *sp;
 697         struct nfs4_state     *state = NULL;
 698         struct nfs_server       *server = NFS_SERVER(dir);
 699         struct nfs4_client *clp = server->nfs4_state;
 700         struct inode *inode = NULL;
 701         int                     status;
 702         struct nfs_fattr f_attr, dir_attr;
 703         struct nfs_openargs o_arg = {
 704                 .fh             = NFS_FH(dir),
 705                 .open_flags     = flags,
 706                 .name           = &dentry->d_name,
 707                 .server         = server,
 708                 .bitmask = server->attr_bitmask,
 709                 .claim = NFS4_OPEN_CLAIM_NULL,
 710         };
 711         struct nfs_openres o_res = {
 712                 .f_attr         = &f_attr,
 713                 .dir_attr       = &dir_attr,
 714                 .server         = server,
 715         };
 716
 717         /* Protect against reboot recovery conflicts */
 718         down_read(&clp->cl_sem);
 719         status = -ENOMEM;
 720         if (!(sp = nfs4_get_state_owner(server, cred))) {
 721                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 722                 goto out_err;
 723         }
 724         if (flags & O_EXCL) {
 725                 u32 *p = (u32 *) o_arg.u.verifier.data;
 726                 p[0] = jiffies;
 727                 p[1] = current->pid;
 728         } else
 729                 o_arg.u.attrs = sattr;
 730         /* Serialization for the sequence id */
 731
 732         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 733         if (o_arg.seqid == NULL)
 734                 return -ENOMEM;
 735         nfs_fattr_init(&f_attr);
 736         nfs_fattr_init(&dir_attr);
 737         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 738         if (status != 0)
 739                 goto out_err;
 740
 741         status = -ENOMEM;
 742         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 743         if (!inode)
 744                 goto out_err;
 745         state = nfs4_get_open_state(inode, sp);
 746         if (!state)
 747                 goto out_err;
 748         update_open_stateid(state, &o_res.stateid, flags);
 749         if (o_res.delegation_type != 0)
 750                 nfs_inode_set_delegation(inode, cred, &o_res);
 751         nfs_free_seqid(o_arg.seqid);
 752         nfs4_put_state_owner(sp);
 753         up_read(&clp->cl_sem);
 754         *res = state;
 755         return 0;
 756 out_err:
 757         if (sp != NULL) {
 758                 if (state != NULL)
 759                         nfs4_put_open_state(state);
 760                 nfs_free_seqid(o_arg.seqid);
 761                 nfs4_put_state_owner(sp);
 762         }
 763         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 764         up_read(&clp->cl_sem);
 765         if (inode != NULL)
 766                 iput(inode);
 767         *res = NULL;
 768         return status;
 769 }
 770
 771
 772 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 773 {
 774         struct nfs4_exception exception = { };
 775         struct nfs4_state *res;
 776         int status;
 777
 778         do {
 779                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 780                 if (status == 0)
 781                         break;
 782                 /* NOTE: BAD_SEQID means the server and client disagree about the
 783                  * book-keeping w.r.t. state-changing operations
 784                  * (OPEN/CLOSE/LOCK/LOCKU...)
 785                  * It is actually a sign of a bug on the client or on the server.
 786                  *
 787                  * If we receive a BAD_SEQID error in the particular case of
 788                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 789                  * have unhashed the old state_owner for us, and that we can
 790                  * therefore safely retry using a new one. We should still warn
 791                  * the user though...
 792                  */
 793                 if (status == -NFS4ERR_BAD_SEQID) {
 794                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 795                         exception.retry = 1;
 796                         continue;
 797                 }
 798                 /*
 799                  * BAD_STATEID on OPEN means that the server cancelled our
 800                  * state before it received the OPEN_CONFIRM.
 801                  * Recover by retrying the request as per the discussion
 802                  * on Page 181 of RFC3530.
 803                  */
 804                 if (status == -NFS4ERR_BAD_STATEID) {
 805                         exception.retry = 1;
 806                         continue;
 807                 }
 808                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 809                                         status, &exception));
 810         } while (exception.retry);
 811         return res;
 812 }
 813
 814 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 815                 struct nfs_fh *fhandle, struct iattr *sattr,
 816                 struct nfs4_state *state)
 817 {
 818         struct nfs_setattrargs  arg = {
 819                 .fh             = fhandle,
 820                 .iap            = sattr,
 821                 .server         = server,
 822                 .bitmask = server->attr_bitmask,
 823         };
 824         struct nfs_setattrres  res = {
 825                 .fattr          = fattr,
 826                 .server         = server,
 827         };
 828         struct rpc_message msg = {
 829                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 830                 .rpc_argp       = &arg,
 831                 .rpc_resp       = &res,
 832         };
 833         int status;
 834
 835         nfs_fattr_init(fattr);
 836
 837         if (state != NULL) {
 838                 msg.rpc_cred = state->owner->so_cred;
 839                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 840         } else
 841                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 842
 843         status = rpc_call_sync(server->client, &msg, 0);
 844         return status;
 845 }
 846
 847 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 848                 struct nfs_fh *fhandle, struct iattr *sattr,
 849                 struct nfs4_state *state)
 850 {
 851         struct nfs4_exception exception = { };
 852         int err;
 853         do {
 854                 err = nfs4_handle_exception(server,
 855                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 856                                         state),
 857                                 &exception);
 858         } while (exception.retry);
 859         return err;
 860 }
 861
 862 struct nfs4_closedata {
 863         struct inode *inode;
 864         struct nfs4_state *state;
 865         struct nfs_closeargs arg;
 866         struct nfs_closeres res;
 867         struct nfs_fattr fattr;
 868 };
 869
 870 static void nfs4_free_closedata(struct nfs4_closedata *calldata)
 871 {
 872         struct nfs4_state *state = calldata->state;
 873         struct nfs4_state_owner *sp = state->owner;
 874
 875         nfs4_put_open_state(calldata->state);
 876         nfs_free_seqid(calldata->arg.seqid);
 877         nfs4_put_state_owner(sp);
 878         kfree(calldata);
 879 }
 880
 881 static void nfs4_close_done(struct rpc_task *task)
 882 {
 883         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 884         struct nfs4_state *state = calldata->state;
 885         struct nfs_server *server = NFS_SERVER(calldata->inode);
 886
 887         /* hmm. we are done with the inode, and in the process of freeing
 888          * the state_owner. we keep this around to process errors
 889          */
 890         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 891         switch (task->tk_status) {
 892                 case 0:
 893                         memcpy(&state->stateid, &calldata->res.stateid,
 894                                         sizeof(state->stateid));
 895                         break;
 896                 case -NFS4ERR_STALE_STATEID:
 897                 case -NFS4ERR_EXPIRED:
 898                         nfs4_schedule_state_recovery(server->nfs4_state);
 899                         break;
 900                 default:
 901                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 902                                 rpc_restart_call(task);
 903                                 return;
 904                         }
 905         }
 906         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
 907         nfs4_free_closedata(calldata);
 908 }
 909
 910 static void nfs4_close_begin(struct rpc_task *task)
 911 {
 912         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 913         struct nfs4_state *state = calldata->state;
 914         struct rpc_message msg = {
 915                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 916                 .rpc_argp = &calldata->arg,
 917                 .rpc_resp = &calldata->res,
 918                 .rpc_cred = state->owner->so_cred,
 919         };
 920         int mode = 0, old_mode;
 921         int status;
 922
 923         status = nfs_wait_on_sequence(calldata->arg.seqid, task);
 924         if (status != 0)
 925                 return;
 926         /* Recalculate the new open mode in case someone reopened the file
 927          * while we were waiting in line to be scheduled.
 928          */
 929         spin_lock(&state->owner->so_lock);
 930         spin_lock(&calldata->inode->i_lock);
 931         mode = old_mode = state->state;
 932         if (state->nreaders == 0)
 933                 mode &= ~FMODE_READ;
 934         if (state->nwriters == 0)
 935                 mode &= ~FMODE_WRITE;
 936         nfs4_state_set_mode_locked(state, mode);
 937         spin_unlock(&calldata->inode->i_lock);
 938         spin_unlock(&state->owner->so_lock);
 939         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
 940                 nfs4_free_closedata(calldata);
 941                 task->tk_exit = NULL;
 942                 rpc_exit(task, 0);
 943                 return;
 944         }
 945         nfs_fattr_init(calldata->res.fattr);
 946         if (mode != 0)
 947                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 948         calldata->arg.open_flags = mode;
 949         rpc_call_setup(task, &msg, 0);
 950 }
 951
 952 /*
 953  * It is possible for data to be read/written from a mem-mapped file
 954  * after the sys_close call (which hits the vfs layer as a flush).
 955  * This means that we can't safely call nfsv4 close on a file until
 956  * the inode is cleared. This in turn means that we are not good
 957  * NFSv4 citizens - we do not indicate to the server to update the file's
 958  * share state even when we are done with one of the three share
 959  * stateid's in the inode.
 960  *
 961  * NOTE: Caller must be holding the sp->so_owner semaphore!
 962  */
 963 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
 964 {
 965         struct nfs_server *server = NFS_SERVER(inode);
 966         struct nfs4_closedata *calldata;
 967         int status = -ENOMEM;
 968
 969         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 970         if (calldata == NULL)
 971                 goto out;
 972         calldata->inode = inode;
 973         calldata->state = state;
 974         calldata->arg.fh = NFS_FH(inode);
 975         calldata->arg.stateid = &state->stateid;
 976         /* Serialization for the sequence id */
 977         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 978         if (calldata->arg.seqid == NULL)
 979                 goto out_free_calldata;
 980         calldata->arg.bitmask = server->attr_bitmask;
 981         calldata->res.fattr = &calldata->fattr;
 982         calldata->res.server = server;
 983
 984         status = nfs4_call_async(server->client, nfs4_close_begin,
 985                         nfs4_close_done, calldata);
 986         if (status == 0)
 987                 goto out;
 988
 989         nfs_free_seqid(calldata->arg.seqid);
 990 out_free_calldata:
 991         kfree(calldata);
 992 out:
 993         return status;
 994 }
 995
 996 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
 997 {
 998         struct file *filp;
 999
1000         filp = lookup_instantiate_filp(nd, dentry, NULL);
1001         if (!IS_ERR(filp)) {
1002                 struct nfs_open_context *ctx;
1003                 ctx = (struct nfs_open_context *)filp->private_data;
1004                 ctx->state = state;
1005         } else
1006                 nfs4_close_state(state, nd->intent.open.flags);
1007 }
1008
1009 struct dentry *
1010 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1011 {
1012         struct iattr attr;
1013         struct rpc_cred *cred;
1014         struct nfs4_state *state;
1015         struct dentry *res;
1016
1017         if (nd->flags & LOOKUP_CREATE) {
1018                 attr.ia_mode = nd->intent.open.create_mode;
1019                 attr.ia_valid = ATTR_MODE;
1020                 if (!IS_POSIXACL(dir))
1021                         attr.ia_mode &= ~current->fs->umask;
1022         } else {
1023                 attr.ia_valid = 0;
1024                 BUG_ON(nd->intent.open.flags & O_CREAT);
1025         }
1026
1027         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1028         if (IS_ERR(cred))
1029                 return (struct dentry *)cred;
1030         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1031         put_rpccred(cred);
1032         if (IS_ERR(state)) {
1033                 if (PTR_ERR(state) == -ENOENT)
1034                         d_add(dentry, NULL);
1035                 return (struct dentry *)state;
1036         }
1037         res = d_add_unique(dentry, state->inode);
1038         if (res != NULL)
1039                 dentry = res;
1040         nfs4_intent_set_file(nd, dentry, state);
1041         return res;
1042 }
1043
1044 int
1045 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1046 {
1047         struct rpc_cred *cred;
1048         struct nfs4_state *state;
1049         struct inode *inode;
1050
1051         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1052         if (IS_ERR(cred))
1053                 return PTR_ERR(cred);
1054         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1055         if (IS_ERR(state))
1056                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1057         put_rpccred(cred);
1058         if (IS_ERR(state)) {
1059                 switch (PTR_ERR(state)) {
1060                         case -EPERM:
1061                         case -EACCES:
1062                         case -EDQUOT:
1063                         case -ENOSPC:
1064                         case -EROFS:
1065                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1066                                 return 1;
1067                         case -ENOENT:
1068                                 if (dentry->d_inode == NULL)
1069                                         return 1;
1070                 }
1071                 goto out_drop;
1072         }
1073         inode = state->inode;
1074         iput(inode);
1075         if (inode == dentry->d_inode) {
1076                 nfs4_intent_set_file(nd, dentry, state);
1077                 return 1;
1078         }
1079         nfs4_close_state(state, openflags);
1080 out_drop:
1081         d_drop(dentry);
1082         return 0;
1083 }
1084
1085
1086 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1087 {
1088         struct nfs4_server_caps_res res = {};
1089         struct rpc_message msg = {
1090                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1091                 .rpc_argp = fhandle,
1092                 .rpc_resp = &res,
1093         };
1094         int status;
1095
1096         status = rpc_call_sync(server->client, &msg, 0);
1097         if (status == 0) {
1098                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1099                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1100                         server->caps |= NFS_CAP_ACLS;
1101                 if (res.has_links != 0)
1102                         server->caps |= NFS_CAP_HARDLINKS;
1103                 if (res.has_symlinks != 0)
1104                         server->caps |= NFS_CAP_SYMLINKS;
1105                 server->acl_bitmask = res.acl_bitmask;
1106         }
1107         return status;
1108 }
1109
1110 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1111 {
1112         struct nfs4_exception exception = { };
1113         int err;
1114         do {
1115                 err = nfs4_handle_exception(server,
1116                                 _nfs4_server_capabilities(server, fhandle),
1117                                 &exception);
1118         } while (exception.retry);
1119         return err;
1120 }
1121
1122 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1123                 struct nfs_fsinfo *info)
1124 {
1125         struct nfs4_lookup_root_arg args = {
1126                 .bitmask = nfs4_fattr_bitmap,
1127         };
1128         struct nfs4_lookup_res res = {
1129                 .server = server,
1130                 .fattr = info->fattr,
1131                 .fh = fhandle,
1132         };
1133         struct rpc_message msg = {
1134                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1135                 .rpc_argp = &args,
1136                 .rpc_resp = &res,
1137         };
1138         nfs_fattr_init(info->fattr);
1139         return rpc_call_sync(server->client, &msg, 0);
1140 }
1141
1142 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1143                 struct nfs_fsinfo *info)
1144 {
1145         struct nfs4_exception exception = { };
1146         int err;
1147         do {
1148                 err = nfs4_handle_exception(server,
1149                                 _nfs4_lookup_root(server, fhandle, info),
1150                                 &exception);
1151         } while (exception.retry);
1152         return err;
1153 }
1154
1155 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1156                 struct nfs_fsinfo *info)
1157 {
1158         struct nfs_fattr *      fattr = info->fattr;
1159         unsigned char *         p;
1160         struct qstr             q;
1161         struct nfs4_lookup_arg args = {
1162                 .dir_fh = fhandle,
1163                 .name = &q,
1164                 .bitmask = nfs4_fattr_bitmap,
1165         };
1166         struct nfs4_lookup_res res = {
1167                 .server = server,
1168                 .fattr = fattr,
1169                 .fh = fhandle,
1170         };
1171         struct rpc_message msg = {
1172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1173                 .rpc_argp = &args,
1174                 .rpc_resp = &res,
1175         };
1176         int status;
1177
1178         /*
1179          * Now we do a separate LOOKUP for each component of the mount path.
1180          * The LOOKUPs are done separately so that we can conveniently
1181          * catch an ERR_WRONGSEC if it occurs along the way...
1182          */
1183         status = nfs4_lookup_root(server, fhandle, info);
1184         if (status)
1185                 goto out;
1186
1187         p = server->mnt_path;
1188         for (;;) {
1189                 struct nfs4_exception exception = { };
1190
1191                 while (*p == '/')
1192                         p++;
1193                 if (!*p)
1194                         break;
1195                 q.name = p;
1196                 while (*p && (*p != '/'))
1197                         p++;
1198                 q.len = p - q.name;
1199
1200                 do {
1201                         nfs_fattr_init(fattr);
1202                         status = nfs4_handle_exception(server,
1203                                         rpc_call_sync(server->client, &msg, 0),
1204                                         &exception);
1205                 } while (exception.retry);
1206                 if (status == 0)
1207                         continue;
1208                 if (status == -ENOENT) {
1209                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1210                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1211                 }
1212                 break;
1213         }
1214         if (status == 0)
1215                 status = nfs4_server_capabilities(server, fhandle);
1216         if (status == 0)
1217                 status = nfs4_do_fsinfo(server, fhandle, info);
1218 out:
1219         return status;
1220 }
1221
1222 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1223 {
1224         struct nfs4_getattr_arg args = {
1225                 .fh = fhandle,
1226                 .bitmask = server->attr_bitmask,
1227         };
1228         struct nfs4_getattr_res res = {
1229                 .fattr = fattr,
1230                 .server = server,
1231         };
1232         struct rpc_message msg = {
1233                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1234                 .rpc_argp = &args,
1235                 .rpc_resp = &res,
1236         };
1237
1238         nfs_fattr_init(fattr);
1239         return rpc_call_sync(server->client, &msg, 0);
1240 }
1241
1242 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1243 {
1244         struct nfs4_exception exception = { };
1245         int err;
1246         do {
1247                 err = nfs4_handle_exception(server,
1248                                 _nfs4_proc_getattr(server, fhandle, fattr),
1249                                 &exception);
1250         } while (exception.retry);
1251         return err;
1252 }
1253
1254 /*
1255  * The file is not closed if it is opened due to the a request to change
1256  * the size of the file. The open call will not be needed once the
1257  * VFS layer lookup-intents are implemented.
1258  *
1259  * Close is called when the inode is destroyed.
1260  * If we haven't opened the file for O_WRONLY, we
1261  * need to in the size_change case to obtain a stateid.
1262  *
1263  * Got race?
1264  * Because OPEN is always done by name in nfsv4, it is
1265  * possible that we opened a different file by the same
1266  * name.  We can recognize this race condition, but we
1267  * can't do anything about it besides returning an error.
1268  *
1269  * This will be fixed with VFS changes (lookup-intent).
1270  */
1271 static int
1272 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1273                   struct iattr *sattr)
1274 {
1275         struct rpc_cred *cred;
1276         struct inode *inode = dentry->d_inode;
1277         struct nfs4_state *state;
1278         int status;
1279
1280         nfs_fattr_init(fattr);
1281
1282         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1283         if (IS_ERR(cred))
1284                 return PTR_ERR(cred);
1285         /* Search for an existing WRITE delegation first */
1286         state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1287         if (!IS_ERR(state)) {
1288                 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1289                 iput(inode);
1290         } else {
1291                 /* Search for an existing open(O_WRITE) stateid */
1292                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1293         }
1294
1295         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1296                         NFS_FH(inode), sattr, state);
1297         if (status == 0)
1298                 nfs_setattr_update_inode(inode, sattr);
1299         if (state != NULL)
1300                 nfs4_close_state(state, FMODE_WRITE);
1301         put_rpccred(cred);
1302         return status;
1303 }
1304
1305 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1306                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1307 {
1308         int                    status;
1309         struct nfs_server *server = NFS_SERVER(dir);
1310         struct nfs4_lookup_arg args = {
1311                 .bitmask = server->attr_bitmask,
1312                 .dir_fh = NFS_FH(dir),
1313                 .name = name,
1314         };
1315         struct nfs4_lookup_res res = {
1316                 .server = server,
1317                 .fattr = fattr,
1318                 .fh = fhandle,
1319         };
1320         struct rpc_message msg = {
1321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1322                 .rpc_argp = &args,
1323                 .rpc_resp = &res,
1324         };
1325
1326         nfs_fattr_init(fattr);
1327
1328         dprintk("NFS call  lookup %s\n", name->name);
1329         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1330         dprintk("NFS reply lookup: %d\n", status);
1331         return status;
1332 }
1333
1334 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1335 {
1336         struct nfs4_exception exception = { };
1337         int err;
1338         do {
1339                 err = nfs4_handle_exception(NFS_SERVER(dir),
1340                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1341                                 &exception);
1342         } while (exception.retry);
1343         return err;
1344 }
1345
1346 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1347 {
1348         struct nfs4_accessargs args = {
1349                 .fh = NFS_FH(inode),
1350         };
1351         struct nfs4_accessres res = { 0 };
1352         struct rpc_message msg = {
1353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1354                 .rpc_argp = &args,
1355                 .rpc_resp = &res,
1356                 .rpc_cred = entry->cred,
1357         };
1358         int mode = entry->mask;
1359         int status;
1360
1361         /*
1362          * Determine which access bits we want to ask for...
1363          */
1364         if (mode & MAY_READ)
1365                 args.access |= NFS4_ACCESS_READ;
1366         if (S_ISDIR(inode->i_mode)) {
1367                 if (mode & MAY_WRITE)
1368                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1369                 if (mode & MAY_EXEC)
1370                         args.access |= NFS4_ACCESS_LOOKUP;
1371         } else {
1372                 if (mode & MAY_WRITE)
1373                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1374                 if (mode & MAY_EXEC)
1375                         args.access |= NFS4_ACCESS_EXECUTE;
1376         }
1377         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1378         if (!status) {
1379                 entry->mask = 0;
1380                 if (res.access & NFS4_ACCESS_READ)
1381                         entry->mask |= MAY_READ;
1382                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1383                         entry->mask |= MAY_WRITE;
1384                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1385                         entry->mask |= MAY_EXEC;
1386         }
1387         return status;
1388 }
1389
1390 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1391 {
1392         struct nfs4_exception exception = { };
1393         int err;
1394         do {
1395                 err = nfs4_handle_exception(NFS_SERVER(inode),
1396                                 _nfs4_proc_access(inode, entry),
1397                                 &exception);
1398         } while (exception.retry);
1399         return err;
1400 }
1401
1402 /*
1403  * TODO: For the time being, we don't try to get any attributes
1404  * along with any of the zero-copy operations READ, READDIR,
1405  * READLINK, WRITE.
1406  *
1407  * In the case of the first three, we want to put the GETATTR
1408  * after the read-type operation -- this is because it is hard
1409  * to predict the length of a GETATTR response in v4, and thus
1410  * align the READ data correctly.  This means that the GETATTR
1411  * may end up partially falling into the page cache, and we should
1412  * shift it into the 'tail' of the xdr_buf before processing.
1413  * To do this efficiently, we need to know the total length
1414  * of data received, which doesn't seem to be available outside
1415  * of the RPC layer.
1416  *
1417  * In the case of WRITE, we also want to put the GETATTR after
1418  * the operation -- in this case because we want to make sure
1419  * we get the post-operation mtime and size.  This means that
1420  * we can't use xdr_encode_pages() as written: we need a variant
1421  * of it which would leave room in the 'tail' iovec.
1422  *
1423  * Both of these changes to the XDR layer would in fact be quite
1424  * minor, but I decided to leave them for a subsequent patch.
1425  */
1426 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1427                 unsigned int pgbase, unsigned int pglen)
1428 {
1429         struct nfs4_readlink args = {
1430                 .fh       = NFS_FH(inode),
1431                 .pgbase   = pgbase,
1432                 .pglen    = pglen,
1433                 .pages    = &page,
1434         };
1435         struct rpc_message msg = {
1436                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1437                 .rpc_argp = &args,
1438                 .rpc_resp = NULL,
1439         };
1440
1441         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1442 }
1443
1444 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1445                 unsigned int pgbase, unsigned int pglen)
1446 {
1447         struct nfs4_exception exception = { };
1448         int err;
1449         do {
1450                 err = nfs4_handle_exception(NFS_SERVER(inode),
1451                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1452                                 &exception);
1453         } while (exception.retry);
1454         return err;
1455 }
1456
1457 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1458 {
1459         int flags = rdata->flags;
1460         struct inode *inode = rdata->inode;
1461         struct nfs_fattr *fattr = rdata->res.fattr;
1462         struct nfs_server *server = NFS_SERVER(inode);
1463         struct rpc_message msg = {
1464                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1465                 .rpc_argp       = &rdata->args,
1466                 .rpc_resp       = &rdata->res,
1467                 .rpc_cred       = rdata->cred,
1468         };
1469         unsigned long timestamp = jiffies;
1470         int status;
1471
1472         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1473                         (long long) rdata->args.offset);
1474
1475         nfs_fattr_init(fattr);
1476         status = rpc_call_sync(server->client, &msg, flags);
1477         if (!status)
1478                 renew_lease(server, timestamp);
1479         dprintk("NFS reply read: %d\n", status);
1480         return status;
1481 }
1482
1483 static int nfs4_proc_read(struct nfs_read_data *rdata)
1484 {
1485         struct nfs4_exception exception = { };
1486         int err;
1487         do {
1488                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1489                                 _nfs4_proc_read(rdata),
1490                                 &exception);
1491         } while (exception.retry);
1492         return err;
1493 }
1494
1495 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1496 {
1497         int rpcflags = wdata->flags;
1498         struct inode *inode = wdata->inode;
1499         struct nfs_fattr *fattr = wdata->res.fattr;
1500         struct nfs_server *server = NFS_SERVER(inode);
1501         struct rpc_message msg = {
1502                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1503                 .rpc_argp       = &wdata->args,
1504                 .rpc_resp       = &wdata->res,
1505                 .rpc_cred       = wdata->cred,
1506         };
1507         int status;
1508
1509         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1510                         (long long) wdata->args.offset);
1511
1512         nfs_fattr_init(fattr);
1513         status = rpc_call_sync(server->client, &msg, rpcflags);
1514         dprintk("NFS reply write: %d\n", status);
1515         return status;
1516 }
1517
1518 static int nfs4_proc_write(struct nfs_write_data *wdata)
1519 {
1520         struct nfs4_exception exception = { };
1521         int err;
1522         do {
1523                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1524                                 _nfs4_proc_write(wdata),
1525                                 &exception);
1526         } while (exception.retry);
1527         return err;
1528 }
1529
1530 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1531 {
1532         struct inode *inode = cdata->inode;
1533         struct nfs_fattr *fattr = cdata->res.fattr;
1534         struct nfs_server *server = NFS_SERVER(inode);
1535         struct rpc_message msg = {
1536                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1537                 .rpc_argp       = &cdata->args,
1538                 .rpc_resp       = &cdata->res,
1539                 .rpc_cred       = cdata->cred,
1540         };
1541         int status;
1542
1543         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1544                         (long long) cdata->args.offset);
1545
1546         nfs_fattr_init(fattr);
1547         status = rpc_call_sync(server->client, &msg, 0);
1548         dprintk("NFS reply commit: %d\n", status);
1549         return status;
1550 }
1551
1552 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1553 {
1554         struct nfs4_exception exception = { };
1555         int err;
1556         do {
1557                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1558                                 _nfs4_proc_commit(cdata),
1559                                 &exception);
1560         } while (exception.retry);
1561         return err;
1562 }
1563
1564 /*
1565  * Got race?
1566  * We will need to arrange for the VFS layer to provide an atomic open.
1567  * Until then, this create/open method is prone to inefficiency and race
1568  * conditions due to the lookup, create, and open VFS calls from sys_open()
1569  * placed on the wire.
1570  *
1571  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1572  * The file will be opened again in the subsequent VFS open call
1573  * (nfs4_proc_file_open).
1574  *
1575  * The open for read will just hang around to be used by any process that
1576  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1577  */
1578
1579 static int
1580 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1581                  int flags, struct nameidata *nd)
1582 {
1583         struct nfs4_state *state;
1584         struct rpc_cred *cred;
1585         int status = 0;
1586
1587         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1588         if (IS_ERR(cred)) {
1589                 status = PTR_ERR(cred);
1590                 goto out;
1591         }
1592         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1593         put_rpccred(cred);
1594         if (IS_ERR(state)) {
1595                 status = PTR_ERR(state);
1596                 goto out;
1597         }
1598         d_instantiate(dentry, state->inode);
1599         if (flags & O_EXCL) {
1600                 struct nfs_fattr fattr;
1601                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1602                                      NFS_FH(state->inode), sattr, state);
1603                 if (status == 0)
1604                         nfs_setattr_update_inode(state->inode, sattr);
1605         }
1606         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1607                 nfs4_intent_set_file(nd, dentry, state);
1608         else
1609                 nfs4_close_state(state, flags);
1610 out:
1611         return status;
1612 }
1613
1614 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1615 {
1616         struct nfs_server *server = NFS_SERVER(dir);
1617         struct nfs4_remove_arg args = {
1618                 .fh = NFS_FH(dir),
1619                 .name = name,
1620                 .bitmask = server->attr_bitmask,
1621         };
1622         struct nfs_fattr dir_attr;
1623         struct nfs4_remove_res  res = {
1624                 .server = server,
1625                 .dir_attr = &dir_attr,
1626         };
1627         struct rpc_message msg = {
1628                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1629                 .rpc_argp       = &args,
1630                 .rpc_resp       = &res,
1631         };
1632         int                     status;
1633
1634         nfs_fattr_init(res.dir_attr);
1635         status = rpc_call_sync(server->client, &msg, 0);
1636         if (status == 0) {
1637                 update_changeattr(dir, &res.cinfo);
1638                 nfs_post_op_update_inode(dir, res.dir_attr);
1639         }
1640         return status;
1641 }
1642
1643 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1644 {
1645         struct nfs4_exception exception = { };
1646         int err;
1647         do {
1648                 err = nfs4_handle_exception(NFS_SERVER(dir),
1649                                 _nfs4_proc_remove(dir, name),
1650                                 &exception);
1651         } while (exception.retry);
1652         return err;
1653 }
1654
1655 struct unlink_desc {
1656         struct nfs4_remove_arg  args;
1657         struct nfs4_remove_res  res;
1658         struct nfs_fattr dir_attr;
1659 };
1660
1661 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1662                 struct qstr *name)
1663 {
1664         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1665         struct unlink_desc *up;
1666
1667         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1668         if (!up)
1669                 return -ENOMEM;
1670
1671         up->args.fh = NFS_FH(dir->d_inode);
1672         up->args.name = name;
1673         up->args.bitmask = server->attr_bitmask;
1674         up->res.server = server;
1675         up->res.dir_attr = &up->dir_attr;
1676
1677         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1678         msg->rpc_argp = &up->args;
1679         msg->rpc_resp = &up->res;
1680         return 0;
1681 }
1682
1683 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1684 {
1685         struct rpc_message *msg = &task->tk_msg;
1686         struct unlink_desc *up;
1687
1688         if (msg->rpc_resp != NULL) {
1689                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1690                 update_changeattr(dir->d_inode, &up->res.cinfo);
1691                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1692                 kfree(up);
1693                 msg->rpc_resp = NULL;
1694                 msg->rpc_argp = NULL;
1695         }
1696         return 0;
1697 }
1698
1699 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1700                 struct inode *new_dir, struct qstr *new_name)
1701 {
1702         struct nfs_server *server = NFS_SERVER(old_dir);
1703         struct nfs4_rename_arg arg = {
1704                 .old_dir = NFS_FH(old_dir),
1705                 .new_dir = NFS_FH(new_dir),
1706                 .old_name = old_name,
1707                 .new_name = new_name,
1708                 .bitmask = server->attr_bitmask,
1709         };
1710         struct nfs_fattr old_fattr, new_fattr;
1711         struct nfs4_rename_res res = {
1712                 .server = server,
1713                 .old_fattr = &old_fattr,
1714                 .new_fattr = &new_fattr,
1715         };
1716         struct rpc_message msg = {
1717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1718                 .rpc_argp = &arg,
1719                 .rpc_resp = &res,
1720         };
1721         int                     status;
1722
1723         nfs_fattr_init(res.old_fattr);
1724         nfs_fattr_init(res.new_fattr);
1725         status = rpc_call_sync(server->client, &msg, 0);
1726
1727         if (!status) {
1728                 update_changeattr(old_dir, &res.old_cinfo);
1729                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1730                 update_changeattr(new_dir, &res.new_cinfo);
1731                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1732         }
1733         return status;
1734 }
1735
1736 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1737                 struct inode *new_dir, struct qstr *new_name)
1738 {
1739         struct nfs4_exception exception = { };
1740         int err;
1741         do {
1742                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1743                                 _nfs4_proc_rename(old_dir, old_name,
1744                                         new_dir, new_name),
1745                                 &exception);
1746         } while (exception.retry);
1747         return err;
1748 }
1749
1750 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1751 {
1752         struct nfs_server *server = NFS_SERVER(inode);
1753         struct nfs4_link_arg arg = {
1754                 .fh     = NFS_FH(inode),
1755                 .dir_fh = NFS_FH(dir),
1756                 .name   = name,
1757                 .bitmask = server->attr_bitmask,
1758         };
1759         struct nfs_fattr fattr, dir_attr;
1760         struct nfs4_link_res res = {
1761                 .server = server,
1762                 .fattr = &fattr,
1763                 .dir_attr = &dir_attr,
1764         };
1765         struct rpc_message msg = {
1766                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1767                 .rpc_argp = &arg,
1768                 .rpc_resp = &res,
1769         };
1770         int                     status;
1771
1772         nfs_fattr_init(res.fattr);
1773         nfs_fattr_init(res.dir_attr);
1774         status = rpc_call_sync(server->client, &msg, 0);
1775         if (!status) {
1776                 update_changeattr(dir, &res.cinfo);
1777                 nfs_post_op_update_inode(dir, res.dir_attr);
1778                 nfs_refresh_inode(inode, res.fattr);
1779         }
1780
1781         return status;
1782 }
1783
1784 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1785 {
1786         struct nfs4_exception exception = { };
1787         int err;
1788         do {
1789                 err = nfs4_handle_exception(NFS_SERVER(inode),
1790                                 _nfs4_proc_link(inode, dir, name),
1791                                 &exception);
1792         } while (exception.retry);
1793         return err;
1794 }
1795
1796 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1797                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1798                 struct nfs_fattr *fattr)
1799 {
1800         struct nfs_server *server = NFS_SERVER(dir);
1801         struct nfs_fattr dir_fattr;
1802         struct nfs4_create_arg arg = {
1803                 .dir_fh = NFS_FH(dir),
1804                 .server = server,
1805                 .name = name,
1806                 .attrs = sattr,
1807                 .ftype = NF4LNK,
1808                 .bitmask = server->attr_bitmask,
1809         };
1810         struct nfs4_create_res res = {
1811                 .server = server,
1812                 .fh = fhandle,
1813                 .fattr = fattr,
1814                 .dir_fattr = &dir_fattr,
1815         };
1816         struct rpc_message msg = {
1817                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1818                 .rpc_argp = &arg,
1819                 .rpc_resp = &res,
1820         };
1821         int                     status;
1822
1823         if (path->len > NFS4_MAXPATHLEN)
1824                 return -ENAMETOOLONG;
1825         arg.u.symlink = path;
1826         nfs_fattr_init(fattr);
1827         nfs_fattr_init(&dir_fattr);
1828
1829         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1830         if (!status)
1831                 update_changeattr(dir, &res.dir_cinfo);
1832         nfs_post_op_update_inode(dir, res.dir_fattr);
1833         return status;
1834 }
1835
1836 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1837                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1838                 struct nfs_fattr *fattr)
1839 {
1840         struct nfs4_exception exception = { };
1841         int err;
1842         do {
1843                 err = nfs4_handle_exception(NFS_SERVER(dir),
1844                                 _nfs4_proc_symlink(dir, name, path, sattr,
1845                                         fhandle, fattr),
1846                                 &exception);
1847         } while (exception.retry);
1848         return err;
1849 }
1850
1851 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1852                 struct iattr *sattr)
1853 {
1854         struct nfs_server *server = NFS_SERVER(dir);
1855         struct nfs_fh fhandle;
1856         struct nfs_fattr fattr, dir_fattr;
1857         struct nfs4_create_arg arg = {
1858                 .dir_fh = NFS_FH(dir),
1859                 .server = server,
1860                 .name = &dentry->d_name,
1861                 .attrs = sattr,
1862                 .ftype = NF4DIR,
1863                 .bitmask = server->attr_bitmask,
1864         };
1865         struct nfs4_create_res res = {
1866                 .server = server,
1867                 .fh = &fhandle,
1868                 .fattr = &fattr,
1869                 .dir_fattr = &dir_fattr,
1870         };
1871         struct rpc_message msg = {
1872                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1873                 .rpc_argp = &arg,
1874                 .rpc_resp = &res,
1875         };
1876         int                     status;
1877
1878         nfs_fattr_init(&fattr);
1879         nfs_fattr_init(&dir_fattr);
1880
1881         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1882         if (!status) {
1883                 update_changeattr(dir, &res.dir_cinfo);
1884                 nfs_post_op_update_inode(dir, res.dir_fattr);
1885                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1886         }
1887         return status;
1888 }
1889
1890 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1891                 struct iattr *sattr)
1892 {
1893         struct nfs4_exception exception = { };
1894         int err;
1895         do {
1896                 err = nfs4_handle_exception(NFS_SERVER(dir),
1897                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1898                                 &exception);
1899         } while (exception.retry);
1900         return err;
1901 }
1902
1903 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1904                   u64 cookie, struct page *page, unsigned int count, int plus)
1905 {
1906         struct inode            *dir = dentry->d_inode;
1907         struct nfs4_readdir_arg args = {
1908                 .fh = NFS_FH(dir),
1909                 .pages = &page,
1910                 .pgbase = 0,
1911                 .count = count,
1912                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1913         };
1914         struct nfs4_readdir_res res;
1915         struct rpc_message msg = {
1916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1917                 .rpc_argp = &args,
1918                 .rpc_resp = &res,
1919                 .rpc_cred = cred,
1920         };
1921         int                     status;
1922
1923         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1924                         dentry->d_parent->d_name.name,
1925                         dentry->d_name.name,
1926                         (unsigned long long)cookie);
1927         lock_kernel();
1928         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1929         res.pgbase = args.pgbase;
1930         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1931         if (status == 0)
1932                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1933         unlock_kernel();
1934         dprintk("%s: returns %d\n", __FUNCTION__, status);
1935         return status;
1936 }
1937
1938 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1939                   u64 cookie, struct page *page, unsigned int count, int plus)
1940 {
1941         struct nfs4_exception exception = { };
1942         int err;
1943         do {
1944                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1945                                 _nfs4_proc_readdir(dentry, cred, cookie,
1946                                         page, count, plus),
1947                                 &exception);
1948         } while (exception.retry);
1949         return err;
1950 }
1951
1952 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1953                 struct iattr *sattr, dev_t rdev)
1954 {
1955         struct nfs_server *server = NFS_SERVER(dir);
1956         struct nfs_fh fh;
1957         struct nfs_fattr fattr, dir_fattr;
1958         struct nfs4_create_arg arg = {
1959                 .dir_fh = NFS_FH(dir),
1960                 .server = server,
1961                 .name = &dentry->d_name,
1962                 .attrs = sattr,
1963                 .bitmask = server->attr_bitmask,
1964         };
1965         struct nfs4_create_res res = {
1966                 .server = server,
1967                 .fh = &fh,
1968                 .fattr = &fattr,
1969                 .dir_fattr = &dir_fattr,
1970         };
1971         struct rpc_message msg = {
1972                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1973                 .rpc_argp = &arg,
1974                 .rpc_resp = &res,
1975         };
1976         int                     status;
1977         int                     mode = sattr->ia_mode;
1978
1979         nfs_fattr_init(&fattr);
1980         nfs_fattr_init(&dir_fattr);
1981
1982         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1983         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1984         if (S_ISFIFO(mode))
1985                 arg.ftype = NF4FIFO;
1986         else if (S_ISBLK(mode)) {
1987                 arg.ftype = NF4BLK;
1988                 arg.u.device.specdata1 = MAJOR(rdev);
1989                 arg.u.device.specdata2 = MINOR(rdev);
1990         }
1991         else if (S_ISCHR(mode)) {
1992                 arg.ftype = NF4CHR;
1993                 arg.u.device.specdata1 = MAJOR(rdev);
1994                 arg.u.device.specdata2 = MINOR(rdev);
1995         }
1996         else
1997                 arg.ftype = NF4SOCK;
1998
1999         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2000         if (status == 0) {
2001                 update_changeattr(dir, &res.dir_cinfo);
2002                 nfs_post_op_update_inode(dir, res.dir_fattr);
2003                 status = nfs_instantiate(dentry, &fh, &fattr);
2004         }
2005         return status;
2006 }
2007
2008 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2009                 struct iattr *sattr, dev_t rdev)
2010 {
2011         struct nfs4_exception exception = { };
2012         int err;
2013         do {
2014                 err = nfs4_handle_exception(NFS_SERVER(dir),
2015                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2016                                 &exception);
2017         } while (exception.retry);
2018         return err;
2019 }
2020
2021 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2022                  struct nfs_fsstat *fsstat)
2023 {
2024         struct nfs4_statfs_arg args = {
2025                 .fh = fhandle,
2026                 .bitmask = server->attr_bitmask,
2027         };
2028         struct rpc_message msg = {
2029                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2030                 .rpc_argp = &args,
2031                 .rpc_resp = fsstat,
2032         };
2033
2034         nfs_fattr_init(fsstat->fattr);
2035         return rpc_call_sync(server->client, &msg, 0);
2036 }
2037
2038 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2039 {
2040         struct nfs4_exception exception = { };
2041         int err;
2042         do {
2043                 err = nfs4_handle_exception(server,
2044                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2045                                 &exception);
2046         } while (exception.retry);
2047         return err;
2048 }
2049
2050 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2051                 struct nfs_fsinfo *fsinfo)
2052 {
2053         struct nfs4_fsinfo_arg args = {
2054                 .fh = fhandle,
2055                 .bitmask = server->attr_bitmask,
2056         };
2057         struct rpc_message msg = {
2058                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2059                 .rpc_argp = &args,
2060                 .rpc_resp = fsinfo,
2061         };
2062
2063         return rpc_call_sync(server->client, &msg, 0);
2064 }
2065
2066 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2067 {
2068         struct nfs4_exception exception = { };
2069         int err;
2070
2071         do {
2072                 err = nfs4_handle_exception(server,
2073                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2074                                 &exception);
2075         } while (exception.retry);
2076         return err;
2077 }
2078
2079 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2080 {
2081         nfs_fattr_init(fsinfo->fattr);
2082         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2083 }
2084
2085 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2086                 struct nfs_pathconf *pathconf)
2087 {
2088         struct nfs4_pathconf_arg args = {
2089                 .fh = fhandle,
2090                 .bitmask = server->attr_bitmask,
2091         };
2092         struct rpc_message msg = {
2093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2094                 .rpc_argp = &args,
2095                 .rpc_resp = pathconf,
2096         };
2097
2098         /* None of the pathconf attributes are mandatory to implement */
2099         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2100                 memset(pathconf, 0, sizeof(*pathconf));
2101                 return 0;
2102         }
2103
2104         nfs_fattr_init(pathconf->fattr);
2105         return rpc_call_sync(server->client, &msg, 0);
2106 }
2107
2108 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2109                 struct nfs_pathconf *pathconf)
2110 {
2111         struct nfs4_exception exception = { };
2112         int err;
2113
2114         do {
2115                 err = nfs4_handle_exception(server,
2116                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2117                                 &exception);
2118         } while (exception.retry);
2119         return err;
2120 }
2121
2122 static void
2123 nfs4_read_done(struct rpc_task *task)
2124 {
2125         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2126         struct inode *inode = data->inode;
2127
2128         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2129                 rpc_restart_call(task);
2130                 return;
2131         }
2132         if (task->tk_status > 0)
2133                 renew_lease(NFS_SERVER(inode), data->timestamp);
2134         /* Call back common NFS readpage processing */
2135         nfs_readpage_result(task);
2136 }
2137
2138 static void
2139 nfs4_proc_read_setup(struct nfs_read_data *data)
2140 {
2141         struct rpc_task *task = &data->task;
2142         struct rpc_message msg = {
2143                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2144                 .rpc_argp = &data->args,
2145                 .rpc_resp = &data->res,
2146                 .rpc_cred = data->cred,
2147         };
2148         struct inode *inode = data->inode;
2149         int flags;
2150
2151         data->timestamp   = jiffies;
2152
2153         /* N.B. Do we need to test? Never called for swapfile inode */
2154         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2155
2156         /* Finalize the task. */
2157         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2158         rpc_call_setup(task, &msg, 0);
2159 }
2160
2161 static void
2162 nfs4_write_done(struct rpc_task *task)
2163 {
2164         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2165         struct inode *inode = data->inode;
2166
2167         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2168                 rpc_restart_call(task);
2169                 return;
2170         }
2171         if (task->tk_status >= 0) {
2172                 renew_lease(NFS_SERVER(inode), data->timestamp);
2173                 nfs_post_op_update_inode(inode, data->res.fattr);
2174         }
2175         /* Call back common NFS writeback processing */
2176         nfs_writeback_done(task);
2177 }
2178
2179 static void
2180 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2181 {
2182         struct rpc_task *task = &data->task;
2183         struct rpc_message msg = {
2184                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2185                 .rpc_argp = &data->args,
2186                 .rpc_resp = &data->res,
2187                 .rpc_cred = data->cred,
2188         };
2189         struct inode *inode = data->inode;
2190         struct nfs_server *server = NFS_SERVER(inode);
2191         int stable;
2192         int flags;
2193
2194         if (how & FLUSH_STABLE) {
2195                 if (!NFS_I(inode)->ncommit)
2196                         stable = NFS_FILE_SYNC;
2197                 else
2198                         stable = NFS_DATA_SYNC;
2199         } else
2200                 stable = NFS_UNSTABLE;
2201         data->args.stable = stable;
2202         data->args.bitmask = server->attr_bitmask;
2203         data->res.server = server;
2204
2205         data->timestamp   = jiffies;
2206
2207         /* Set the initial flags for the task.  */
2208         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2209
2210         /* Finalize the task. */
2211         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2212         rpc_call_setup(task, &msg, 0);
2213 }
2214
2215 static void
2216 nfs4_commit_done(struct rpc_task *task)
2217 {
2218         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2219         struct inode *inode = data->inode;
2220
2221         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2222                 rpc_restart_call(task);
2223                 return;
2224         }
2225         if (task->tk_status >= 0)
2226                 nfs_post_op_update_inode(inode, data->res.fattr);
2227         /* Call back common NFS writeback processing */
2228         nfs_commit_done(task);
2229 }
2230
2231 static void
2232 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2233 {
2234         struct rpc_task *task = &data->task;
2235         struct rpc_message msg = {
2236                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2237                 .rpc_argp = &data->args,
2238                 .rpc_resp = &data->res,
2239                 .rpc_cred = data->cred,
2240         };
2241         struct inode *inode = data->inode;
2242         struct nfs_server *server = NFS_SERVER(inode);
2243         int flags;
2244
2245         data->args.bitmask = server->attr_bitmask;
2246         data->res.server = server;
2247
2248         /* Set the initial flags for the task.  */
2249         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2250
2251         /* Finalize the task. */
2252         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2253         rpc_call_setup(task, &msg, 0);
2254 }
2255
2256 /*
2257  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2258  * standalone procedure for queueing an asynchronous RENEW.
2259  */
2260 static void
2261 renew_done(struct rpc_task *task)
2262 {
2263         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2264         unsigned long timestamp = (unsigned long)task->tk_calldata;
2265
2266         if (task->tk_status < 0) {
2267                 switch (task->tk_status) {
2268                         case -NFS4ERR_STALE_CLIENTID:
2269                         case -NFS4ERR_EXPIRED:
2270                         case -NFS4ERR_CB_PATH_DOWN:
2271                                 nfs4_schedule_state_recovery(clp);
2272                 }
2273                 return;
2274         }
2275         spin_lock(&clp->cl_lock);
2276         if (time_before(clp->cl_last_renewal,timestamp))
2277                 clp->cl_last_renewal = timestamp;
2278         spin_unlock(&clp->cl_lock);
2279 }
2280
2281 int
2282 nfs4_proc_async_renew(struct nfs4_client *clp)
2283 {
2284         struct rpc_message msg = {
2285                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2286                 .rpc_argp       = clp,
2287                 .rpc_cred       = clp->cl_cred,
2288         };
2289
2290         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2291                         renew_done, (void *)jiffies);
2292 }
2293
2294 int
2295 nfs4_proc_renew(struct nfs4_client *clp)
2296 {
2297         struct rpc_message msg = {
2298                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2299                 .rpc_argp       = clp,
2300                 .rpc_cred       = clp->cl_cred,
2301         };
2302         unsigned long now = jiffies;
2303         int status;
2304
2305         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2306         if (status < 0)
2307                 return status;
2308         spin_lock(&clp->cl_lock);
2309         if (time_before(clp->cl_last_renewal,now))
2310                 clp->cl_last_renewal = now;
2311         spin_unlock(&clp->cl_lock);
2312         return 0;
2313 }
2314
2315 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2316 {
2317         return (server->caps & NFS_CAP_ACLS)
2318                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2319                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2320 }
2321
2322 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2323  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2324  * the stack.
2325  */
2326 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2327
2328 static void buf_to_pages(const void *buf, size_t buflen,
2329                 struct page **pages, unsigned int *pgbase)
2330 {
2331         const void *p = buf;
2332
2333         *pgbase = offset_in_page(buf);
2334         p -= *pgbase;
2335         while (p < buf + buflen) {
2336                 *(pages++) = virt_to_page(p);
2337                 p += PAGE_CACHE_SIZE;
2338         }
2339 }
2340
2341 struct nfs4_cached_acl {
2342         int cached;
2343         size_t len;
2344         char data[0];
2345 };
2346
2347 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2348 {
2349         struct nfs_inode *nfsi = NFS_I(inode);
2350
2351         spin_lock(&inode->i_lock);
2352         kfree(nfsi->nfs4_acl);
2353         nfsi->nfs4_acl = acl;
2354         spin_unlock(&inode->i_lock);
2355 }
2356
2357 static void nfs4_zap_acl_attr(struct inode *inode)
2358 {
2359         nfs4_set_cached_acl(inode, NULL);
2360 }
2361
2362 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2363 {
2364         struct nfs_inode *nfsi = NFS_I(inode);
2365         struct nfs4_cached_acl *acl;
2366         int ret = -ENOENT;
2367
2368         spin_lock(&inode->i_lock);
2369         acl = nfsi->nfs4_acl;
2370         if (acl == NULL)
2371                 goto out;
2372         if (buf == NULL) /* user is just asking for length */
2373                 goto out_len;
2374         if (acl->cached == 0)
2375                 goto out;
2376         ret = -ERANGE; /* see getxattr(2) man page */
2377         if (acl->len > buflen)
2378                 goto out;
2379         memcpy(buf, acl->data, acl->len);
2380 out_len:
2381         ret = acl->len;
2382 out:
2383         spin_unlock(&inode->i_lock);
2384         return ret;
2385 }
2386
2387 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2388 {
2389         struct nfs4_cached_acl *acl;
2390
2391         if (buf && acl_len <= PAGE_SIZE) {
2392                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2393                 if (acl == NULL)
2394                         goto out;
2395                 acl->cached = 1;
2396                 memcpy(acl->data, buf, acl_len);
2397         } else {
2398                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2399                 if (acl == NULL)
2400                         goto out;
2401                 acl->cached = 0;
2402         }
2403         acl->len = acl_len;
2404 out:
2405         nfs4_set_cached_acl(inode, acl);
2406 }
2407
2408 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2409 {
2410         struct page *pages[NFS4ACL_MAXPAGES];
2411         struct nfs_getaclargs args = {
2412                 .fh = NFS_FH(inode),
2413                 .acl_pages = pages,
2414                 .acl_len = buflen,
2415         };
2416         size_t resp_len = buflen;
2417         void *resp_buf;
2418         struct rpc_message msg = {
2419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2420                 .rpc_argp = &args,
2421                 .rpc_resp = &resp_len,
2422         };
2423         struct page *localpage = NULL;
2424         int ret;
2425
2426         if (buflen < PAGE_SIZE) {
2427                 /* As long as we're doing a round trip to the server anyway,
2428                  * let's be prepared for a page of acl data. */
2429                 localpage = alloc_page(GFP_KERNEL);
2430                 resp_buf = page_address(localpage);
2431                 if (localpage == NULL)
2432                         return -ENOMEM;
2433                 args.acl_pages[0] = localpage;
2434                 args.acl_pgbase = 0;
2435                 resp_len = args.acl_len = PAGE_SIZE;
2436         } else {
2437                 resp_buf = buf;
2438                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2439         }
2440         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2441         if (ret)
2442                 goto out_free;
2443         if (resp_len > args.acl_len)
2444                 nfs4_write_cached_acl(inode, NULL, resp_len);
2445         else
2446                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2447         if (buf) {
2448                 ret = -ERANGE;
2449                 if (resp_len > buflen)
2450                         goto out_free;
2451                 if (localpage)
2452                         memcpy(buf, resp_buf, resp_len);
2453         }
2454         ret = resp_len;
2455 out_free:
2456         if (localpage)
2457                 __free_page(localpage);
2458         return ret;
2459 }
2460
2461 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2462 {
2463         struct nfs_server *server = NFS_SERVER(inode);
2464         int ret;
2465
2466         if (!nfs4_server_supports_acls(server))
2467                 return -EOPNOTSUPP;
2468         ret = nfs_revalidate_inode(server, inode);
2469         if (ret < 0)
2470                 return ret;
2471         ret = nfs4_read_cached_acl(inode, buf, buflen);
2472         if (ret != -ENOENT)
2473                 return ret;
2474         return nfs4_get_acl_uncached(inode, buf, buflen);
2475 }
2476
2477 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2478 {
2479         struct nfs_server *server = NFS_SERVER(inode);
2480         struct page *pages[NFS4ACL_MAXPAGES];
2481         struct nfs_setaclargs arg = {
2482                 .fh             = NFS_FH(inode),
2483                 .acl_pages      = pages,
2484                 .acl_len        = buflen,
2485         };
2486         struct rpc_message msg = {
2487                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2488                 .rpc_argp       = &arg,
2489                 .rpc_resp       = NULL,
2490         };
2491         int ret;
2492
2493         if (!nfs4_server_supports_acls(server))
2494                 return -EOPNOTSUPP;
2495         nfs_inode_return_delegation(inode);
2496         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2497         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2498         if (ret == 0)
2499                 nfs4_write_cached_acl(inode, buf, buflen);
2500         return ret;
2501 }
2502
2503 static int
2504 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2505 {
2506         struct nfs4_client *clp = server->nfs4_state;
2507
2508         if (!clp || task->tk_status >= 0)
2509                 return 0;
2510         switch(task->tk_status) {
2511                 case -NFS4ERR_STALE_CLIENTID:
2512                 case -NFS4ERR_STALE_STATEID:
2513                 case -NFS4ERR_EXPIRED:
2514                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2515                         nfs4_schedule_state_recovery(clp);
2516                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2517                                 rpc_wake_up_task(task);
2518                         task->tk_status = 0;
2519                         return -EAGAIN;
2520                 case -NFS4ERR_GRACE:
2521                 case -NFS4ERR_DELAY:
2522                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2523                         task->tk_status = 0;
2524                         return -EAGAIN;
2525                 case -NFS4ERR_OLD_STATEID:
2526                         task->tk_status = 0;
2527                         return -EAGAIN;
2528         }
2529         task->tk_status = nfs4_map_errors(task->tk_status);
2530         return 0;
2531 }
2532
2533 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2534 {
2535         DEFINE_WAIT(wait);
2536         sigset_t oldset;
2537         int interruptible, res = 0;
2538
2539         might_sleep();
2540
2541         rpc_clnt_sigmask(clnt, &oldset);
2542         interruptible = TASK_UNINTERRUPTIBLE;
2543         if (clnt->cl_intr)
2544                 interruptible = TASK_INTERRUPTIBLE;
2545         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2546         nfs4_schedule_state_recovery(clp);
2547         if (clnt->cl_intr && signalled())
2548                 res = -ERESTARTSYS;
2549         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2550                 schedule();
2551         finish_wait(&clp->cl_waitq, &wait);
2552         rpc_clnt_sigunmask(clnt, &oldset);
2553         return res;
2554 }
2555
2556 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2557 {
2558         sigset_t oldset;
2559         int res = 0;
2560
2561         might_sleep();
2562
2563         if (*timeout <= 0)
2564                 *timeout = NFS4_POLL_RETRY_MIN;
2565         if (*timeout > NFS4_POLL_RETRY_MAX)
2566                 *timeout = NFS4_POLL_RETRY_MAX;
2567         rpc_clnt_sigmask(clnt, &oldset);
2568         if (clnt->cl_intr) {
2569                 schedule_timeout_interruptible(*timeout);
2570                 if (signalled())
2571                         res = -ERESTARTSYS;
2572         } else
2573                 schedule_timeout_uninterruptible(*timeout);
2574         rpc_clnt_sigunmask(clnt, &oldset);
2575         *timeout <<= 1;
2576         return res;
2577 }
2578
2579 /* This is the error handling routine for processes that are allowed
2580  * to sleep.
2581  */
2582 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2583 {
2584         struct nfs4_client *clp = server->nfs4_state;
2585         int ret = errorcode;
2586
2587         exception->retry = 0;
2588         switch(errorcode) {
2589                 case 0:
2590                         return 0;
2591                 case -NFS4ERR_STALE_CLIENTID:
2592                 case -NFS4ERR_STALE_STATEID:
2593                 case -NFS4ERR_EXPIRED:
2594                         ret = nfs4_wait_clnt_recover(server->client, clp);
2595                         if (ret == 0)
2596                                 exception->retry = 1;
2597                         break;
2598                 case -NFS4ERR_GRACE:
2599                 case -NFS4ERR_DELAY:
2600                         ret = nfs4_delay(server->client, &exception->timeout);
2601                         if (ret == 0)
2602                                 exception->retry = 1;
2603                         break;
2604                 case -NFS4ERR_OLD_STATEID:
2605                         if (ret == 0)
2606                                 exception->retry = 1;
2607         }
2608         /* We failed to handle the error */
2609         return nfs4_map_errors(ret);
2610 }
2611
2612 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2613 {
2614         nfs4_verifier sc_verifier;
2615         struct nfs4_setclientid setclientid = {
2616                 .sc_verifier = &sc_verifier,
2617                 .sc_prog = program,
2618         };
2619         struct rpc_message msg = {
2620                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2621                 .rpc_argp = &setclientid,
2622                 .rpc_resp = clp,
2623                 .rpc_cred = clp->cl_cred,
2624         };
2625         u32 *p;
2626         int loop = 0;
2627         int status;
2628
2629         p = (u32*)sc_verifier.data;
2630         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2631         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2632
2633         for(;;) {
2634                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2635                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2636                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2637                                 clp->cl_cred->cr_ops->cr_name,
2638                                 clp->cl_id_uniquifier);
2639                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2640                                 sizeof(setclientid.sc_netid), "tcp");
2641                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2642                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2643                                 clp->cl_ipaddr, port >> 8, port & 255);
2644
2645                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2646                 if (status != -NFS4ERR_CLID_INUSE)
2647                         break;
2648                 if (signalled())
2649                         break;
2650                 if (loop++ & 1)
2651                         ssleep(clp->cl_lease_time + 1);
2652                 else
2653                         if (++clp->cl_id_uniquifier == 0)
2654                                 break;
2655         }
2656         return status;
2657 }
2658
2659 int
2660 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2661 {
2662         struct nfs_fsinfo fsinfo;
2663         struct rpc_message msg = {
2664                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2665                 .rpc_argp = clp,
2666                 .rpc_resp = &fsinfo,
2667                 .rpc_cred = clp->cl_cred,
2668         };
2669         unsigned long now;
2670         int status;
2671
2672         now = jiffies;
2673         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2674         if (status == 0) {
2675                 spin_lock(&clp->cl_lock);
2676                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2677                 clp->cl_last_renewal = now;
2678                 spin_unlock(&clp->cl_lock);
2679         }
2680         return status;
2681 }
2682
2683 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2684 {
2685         struct nfs4_delegreturnargs args = {
2686                 .fhandle = NFS_FH(inode),
2687                 .stateid = stateid,
2688         };
2689         struct rpc_message msg = {
2690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2691                 .rpc_argp = &args,
2692                 .rpc_cred = cred,
2693         };
2694
2695         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2696 }
2697
2698 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2699 {
2700         struct nfs_server *server = NFS_SERVER(inode);
2701         struct nfs4_exception exception = { };
2702         int err;
2703         do {
2704                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2705                 switch (err) {
2706                         case -NFS4ERR_STALE_STATEID:
2707                         case -NFS4ERR_EXPIRED:
2708                                 nfs4_schedule_state_recovery(server->nfs4_state);
2709                         case 0:
2710                                 return 0;
2711                 }
2712                 err = nfs4_handle_exception(server, err, &exception);
2713         } while (exception.retry);
2714         return err;
2715 }
2716
2717 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2718 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2719
2720 /*
2721  * sleep, with exponential backoff, and retry the LOCK operation.
2722  */
2723 static unsigned long
2724 nfs4_set_lock_task_retry(unsigned long timeout)
2725 {
2726         schedule_timeout_interruptible(timeout);
2727         timeout <<= 1;
2728         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2729                 return NFS4_LOCK_MAXTIMEOUT;
2730         return timeout;
2731 }
2732
2733 static inline int
2734 nfs4_lck_type(int cmd, struct file_lock *request)
2735 {
2736         /* set lock type */
2737         switch (request->fl_type) {
2738                 case F_RDLCK:
2739                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2740                 case F_WRLCK:
2741                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2742                 case F_UNLCK:
2743                         return NFS4_WRITE_LT;
2744         }
2745         BUG();
2746         return 0;
2747 }
2748
2749 static inline uint64_t
2750 nfs4_lck_length(struct file_lock *request)
2751 {
2752         if (request->fl_end == OFFSET_MAX)
2753                 return ~(uint64_t)0;
2754         return request->fl_end - request->fl_start + 1;
2755 }
2756
2757 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2758 {
2759         struct inode *inode = state->inode;
2760         struct nfs_server *server = NFS_SERVER(inode);
2761         struct nfs4_client *clp = server->nfs4_state;
2762         struct nfs_lockargs arg = {
2763                 .fh = NFS_FH(inode),
2764                 .type = nfs4_lck_type(cmd, request),
2765                 .offset = request->fl_start,
2766                 .length = nfs4_lck_length(request),
2767         };
2768         struct nfs_lockres res = {
2769                 .server = server,
2770         };
2771         struct rpc_message msg = {
2772                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2773                 .rpc_argp       = &arg,
2774                 .rpc_resp       = &res,
2775                 .rpc_cred       = state->owner->so_cred,
2776         };
2777         struct nfs_lowner nlo;
2778         struct nfs4_lock_state *lsp;
2779         int status;
2780
2781         down_read(&clp->cl_sem);
2782         nlo.clientid = clp->cl_clientid;
2783         status = nfs4_set_lock_state(state, request);
2784         if (status != 0)
2785                 goto out;
2786         lsp = request->fl_u.nfs4_fl.owner;
2787         nlo.id = lsp->ls_id;
2788         arg.u.lockt = &nlo;
2789         status = rpc_call_sync(server->client, &msg, 0);
2790         if (!status) {
2791                 request->fl_type = F_UNLCK;
2792         } else if (status == -NFS4ERR_DENIED) {
2793                 int64_t len, start, end;
2794                 start = res.u.denied.offset;
2795                 len = res.u.denied.length;
2796                 end = start + len - 1;
2797                 if (end < 0 || len == 0)
2798                         request->fl_end = OFFSET_MAX;
2799                 else
2800                         request->fl_end = (loff_t)end;
2801                 request->fl_start = (loff_t)start;
2802                 request->fl_type = F_WRLCK;
2803                 if (res.u.denied.type & 1)
2804                         request->fl_type = F_RDLCK;
2805                 request->fl_pid = 0;
2806                 status = 0;
2807         }
2808 out:
2809         up_read(&clp->cl_sem);
2810         return status;
2811 }
2812
2813 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2814 {
2815         struct nfs4_exception exception = { };
2816         int err;
2817
2818         do {
2819                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2820                                 _nfs4_proc_getlk(state, cmd, request),
2821                                 &exception);
2822         } while (exception.retry);
2823         return err;
2824 }
2825
2826 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2827 {
2828         int res = 0;
2829         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2830                 case FL_POSIX:
2831                         res = posix_lock_file_wait(file, fl);
2832                         break;
2833                 case FL_FLOCK:
2834                         res = flock_lock_file_wait(file, fl);
2835                         break;
2836                 default:
2837                         BUG();
2838         }
2839         if (res < 0)
2840                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2841                                 __FUNCTION__);
2842         return res;
2843 }
2844
2845 struct nfs4_unlockdata {
2846         struct nfs_lockargs arg;
2847         struct nfs_locku_opargs luargs;
2848         struct nfs_lockres res;
2849         struct nfs4_lock_state *lsp;
2850         struct nfs_open_context *ctx;
2851         atomic_t refcount;
2852         struct completion completion;
2853 };
2854
2855 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2856 {
2857         if (atomic_dec_and_test(&calldata->refcount)) {
2858                 nfs_free_seqid(calldata->luargs.seqid);
2859                 nfs4_put_lock_state(calldata->lsp);
2860                 put_nfs_open_context(calldata->ctx);
2861                 kfree(calldata);
2862         }
2863 }
2864
2865 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2866 {
2867         complete(&calldata->completion);
2868         nfs4_locku_release_calldata(calldata);
2869 }
2870
2871 static void nfs4_locku_done(struct rpc_task *task)
2872 {
2873         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2874
2875         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2876         switch (task->tk_status) {
2877                 case 0:
2878                         memcpy(calldata->lsp->ls_stateid.data,
2879                                         calldata->res.u.stateid.data,
2880                                         sizeof(calldata->lsp->ls_stateid.data));
2881                         break;
2882                 case -NFS4ERR_STALE_STATEID:
2883                 case -NFS4ERR_EXPIRED:
2884                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2885                         break;
2886                 default:
2887                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2888                                 rpc_restart_call(task);
2889                                 return;
2890                         }
2891         }
2892         nfs4_locku_complete(calldata);
2893 }
2894
2895 static void nfs4_locku_begin(struct rpc_task *task)
2896 {
2897         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2898         struct rpc_message msg = {
2899                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2900                 .rpc_argp       = &calldata->arg,
2901                 .rpc_resp       = &calldata->res,
2902                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2903         };
2904         int status;
2905
2906         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2907         if (status != 0)
2908                 return;
2909         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2910                 nfs4_locku_complete(calldata);
2911                 task->tk_exit = NULL;
2912                 rpc_exit(task, 0);
2913                 return;
2914         }
2915         rpc_call_setup(task, &msg, 0);
2916 }
2917
2918 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2919 {
2920         struct nfs4_unlockdata *calldata;
2921         struct inode *inode = state->inode;
2922         struct nfs_server *server = NFS_SERVER(inode);
2923         struct nfs4_lock_state *lsp;
2924         int status;
2925
2926         status = nfs4_set_lock_state(state, request);
2927         if (status != 0)
2928                 return status;
2929         lsp = request->fl_u.nfs4_fl.owner;
2930         /* We might have lost the locks! */
2931         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2932                 return 0;
2933         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2934         if (calldata == NULL)
2935                 return -ENOMEM;
2936         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2937         if (calldata->luargs.seqid == NULL) {
2938                 kfree(calldata);
2939                 return -ENOMEM;
2940         }
2941         calldata->luargs.stateid = &lsp->ls_stateid;
2942         calldata->arg.fh = NFS_FH(inode);
2943         calldata->arg.type = nfs4_lck_type(cmd, request);
2944         calldata->arg.offset = request->fl_start;
2945         calldata->arg.length = nfs4_lck_length(request);
2946         calldata->arg.u.locku = &calldata->luargs;
2947         calldata->res.server = server;
2948         calldata->lsp = lsp;
2949         atomic_inc(&lsp->ls_count);
2950
2951         /* Ensure we don't close file until we're done freeing locks! */
2952         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2953
2954         atomic_set(&calldata->refcount, 2);
2955         init_completion(&calldata->completion);
2956
2957         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2958                         nfs4_locku_done, calldata);
2959         if (status == 0)
2960                 wait_for_completion_interruptible(&calldata->completion);
2961         do_vfs_lock(request->fl_file, request);
2962         nfs4_locku_release_calldata(calldata);
2963         return status;
2964 }
2965
2966 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2967 {
2968         struct inode *inode = state->inode;
2969         struct nfs_server *server = NFS_SERVER(inode);
2970         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2971         struct nfs_lock_opargs largs = {
2972                 .lock_stateid = &lsp->ls_stateid,
2973                 .open_stateid = &state->stateid,
2974                 .lock_owner = {
2975                         .clientid = server->nfs4_state->cl_clientid,
2976                         .id = lsp->ls_id,
2977                 },
2978                 .reclaim = reclaim,
2979         };
2980         struct nfs_lockargs arg = {
2981                 .fh = NFS_FH(inode),
2982                 .type = nfs4_lck_type(cmd, request),
2983                 .offset = request->fl_start,
2984                 .length = nfs4_lck_length(request),
2985                 .u = {
2986                         .lock = &largs,
2987                 },
2988         };
2989         struct nfs_lockres res = {
2990                 .server = server,
2991         };
2992         struct rpc_message msg = {
2993                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2994                 .rpc_argp       = &arg,
2995                 .rpc_resp       = &res,
2996                 .rpc_cred       = state->owner->so_cred,
2997         };
2998         int status = -ENOMEM;
2999
3000         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3001         if (largs.lock_seqid == NULL)
3002                 return -ENOMEM;
3003         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
3004                 struct nfs4_state_owner *owner = state->owner;
3005
3006                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
3007                 if (largs.open_seqid == NULL)
3008                         goto out;
3009                 largs.new_lock_owner = 1;
3010                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3011                 /* increment open seqid on success, and seqid mutating errors */
3012                 if (largs.new_lock_owner != 0) {
3013                         nfs_increment_open_seqid(status, largs.open_seqid);
3014                         if (status == 0)
3015                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
3016                 }
3017                 nfs_free_seqid(largs.open_seqid);
3018         } else
3019                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3020         /* increment lock seqid on success, and seqid mutating errors*/
3021         nfs_increment_lock_seqid(status, largs.lock_seqid);
3022         /* save the returned stateid. */
3023         if (status == 0) {
3024                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
3025                                 sizeof(lsp->ls_stateid.data));
3026                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3027         } else if (status == -NFS4ERR_DENIED)
3028                 status = -EAGAIN;
3029 out:
3030         nfs_free_seqid(largs.lock_seqid);
3031         return status;
3032 }
3033
3034 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3035 {
3036         struct nfs_server *server = NFS_SERVER(state->inode);
3037         struct nfs4_exception exception = { };
3038         int err;
3039
3040         do {
3041                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3042                 if (err != -NFS4ERR_DELAY)
3043                         break;
3044                 nfs4_handle_exception(server, err, &exception);
3045         } while (exception.retry);
3046         return err;
3047 }
3048
3049 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3050 {
3051         struct nfs_server *server = NFS_SERVER(state->inode);
3052         struct nfs4_exception exception = { };
3053         int err;
3054
3055         do {
3056                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3057                 if (err != -NFS4ERR_DELAY)
3058                         break;
3059                 nfs4_handle_exception(server, err, &exception);
3060         } while (exception.retry);
3061         return err;
3062 }
3063
3064 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3065 {
3066         struct nfs4_client *clp = state->owner->so_client;
3067         int status;
3068
3069         down_read(&clp->cl_sem);
3070         status = nfs4_set_lock_state(state, request);
3071         if (status == 0)
3072                 status = _nfs4_do_setlk(state, cmd, request, 0);
3073         if (status == 0) {
3074                 /* Note: we always want to sleep here! */
3075                 request->fl_flags |= FL_SLEEP;
3076                 if (do_vfs_lock(request->fl_file, request) < 0)
3077                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3078         }
3079         up_read(&clp->cl_sem);
3080         return status;
3081 }
3082
3083 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3084 {
3085         struct nfs4_exception exception = { };
3086         int err;
3087
3088         do {
3089                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3090                                 _nfs4_proc_setlk(state, cmd, request),
3091                                 &exception);
3092         } while (exception.retry);
3093         return err;
3094 }
3095
3096 static int
3097 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3098 {
3099         struct nfs_open_context *ctx;
3100         struct nfs4_state *state;
3101         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3102         int status;
3103
3104         /* verify open state */
3105         ctx = (struct nfs_open_context *)filp->private_data;
3106         state = ctx->state;
3107
3108         if (request->fl_start < 0 || request->fl_end < 0)
3109                 return -EINVAL;
3110
3111         if (IS_GETLK(cmd))
3112                 return nfs4_proc_getlk(state, F_GETLK, request);
3113
3114         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3115                 return -EINVAL;
3116
3117         if (request->fl_type == F_UNLCK)
3118                 return nfs4_proc_unlck(state, cmd, request);
3119
3120         do {
3121                 status = nfs4_proc_setlk(state, cmd, request);
3122                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3123                         break;
3124                 timeout = nfs4_set_lock_task_retry(timeout);
3125                 status = -ERESTARTSYS;
3126                 if (signalled())
3127                         break;
3128         } while(status < 0);
3129         return status;
3130 }
3131
3132
3133 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3134
3135 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3136                 size_t buflen, int flags)
3137 {
3138         struct inode *inode = dentry->d_inode;
3139
3140         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3141                 return -EOPNOTSUPP;
3142
3143         if (!S_ISREG(inode->i_mode) &&
3144             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3145                 return -EPERM;
3146
3147         return nfs4_proc_set_acl(inode, buf, buflen);
3148 }
3149
3150 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3151  * and that's what we'll do for e.g. user attributes that haven't been set.
3152  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3153  * attributes in kernel-managed attribute namespaces. */
3154 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3155                 size_t buflen)
3156 {
3157         struct inode *inode = dentry->d_inode;
3158
3159         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3160                 return -EOPNOTSUPP;
3161
3162         return nfs4_proc_get_acl(inode, buf, buflen);
3163 }
3164
3165 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3166 {
3167         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3168
3169         if (buf && buflen < len)
3170                 return -ERANGE;
3171         if (buf)
3172                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3173         return len;
3174 }
3175
3176 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3177         .recover_open   = nfs4_open_reclaim,
3178         .recover_lock   = nfs4_lock_reclaim,
3179 };
3180
3181 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3182         .recover_open   = nfs4_open_expired,
3183         .recover_lock   = nfs4_lock_expired,
3184 };
3185
3186 static struct inode_operations nfs4_file_inode_operations = {
3187         .permission     = nfs_permission,
3188         .getattr        = nfs_getattr,
3189         .setattr        = nfs_setattr,
3190         .getxattr       = nfs4_getxattr,
3191         .setxattr       = nfs4_setxattr,
3192         .listxattr      = nfs4_listxattr,
3193 };
3194
3195 struct nfs_rpc_ops      nfs_v4_clientops = {
3196         .version        = 4,                    /* protocol version */
3197         .dentry_ops     = &nfs4_dentry_operations,
3198         .dir_inode_ops  = &nfs4_dir_inode_operations,
3199         .file_inode_ops = &nfs4_file_inode_operations,
3200         .getroot        = nfs4_proc_get_root,
3201         .getattr        = nfs4_proc_getattr,
3202         .setattr        = nfs4_proc_setattr,
3203         .lookup         = nfs4_proc_lookup,
3204         .access         = nfs4_proc_access,
3205         .readlink       = nfs4_proc_readlink,
3206         .read           = nfs4_proc_read,
3207         .write          = nfs4_proc_write,
3208         .commit         = nfs4_proc_commit,
3209         .create         = nfs4_proc_create,
3210         .remove         = nfs4_proc_remove,
3211         .unlink_setup   = nfs4_proc_unlink_setup,
3212         .unlink_done    = nfs4_proc_unlink_done,
3213         .rename         = nfs4_proc_rename,
3214         .link           = nfs4_proc_link,
3215         .symlink        = nfs4_proc_symlink,
3216         .mkdir          = nfs4_proc_mkdir,
3217         .rmdir          = nfs4_proc_remove,
3218         .readdir        = nfs4_proc_readdir,
3219         .mknod          = nfs4_proc_mknod,
3220         .statfs         = nfs4_proc_statfs,
3221         .fsinfo         = nfs4_proc_fsinfo,
3222         .pathconf       = nfs4_proc_pathconf,
3223         .decode_dirent  = nfs4_decode_dirent,
3224         .read_setup     = nfs4_proc_read_setup,
3225         .write_setup    = nfs4_proc_write_setup,
3226         .commit_setup   = nfs4_proc_commit_setup,
3227         .file_open      = nfs_open,
3228         .file_release   = nfs_release,
3229         .lock           = nfs4_proc_lock,
3230         .clear_acl_cache = nfs4_zap_acl_attr,
3231 };
3232
3233 /*
3234  * Local variables:
3235  *  c-basic-offset: 8
3236  * End:
3237  */