fs/nfs/proc.c

   1 /*
   2  *  linux/fs/nfs/proc.c
   3  *
   4  *  Copyright (C) 1992, 1993, 1994  Rick Sladkey
   5  *
   6  *  OS-independent nfs remote procedure call functions
   7  *
   8  *  Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
   9  *  so at last we can have decent(ish) throughput off a
  10  *  Sun server.
  11  *
  12  *  Coding optimized and cleaned up by Florian La Roche.
  13  *  Note: Error returns are optimized for NFS_OK, which isn't translated via
  14  *  nfs_stat_to_errno(), but happens to be already the right return code.
  15  *
  16  *  Also, the code currently doesn't check the size of the packet, when
  17  *  it decodes the packet.
  18  *
  19  *  Feel free to fix it and mail me the diffs if it worries you.
  20  *
  21  *  Completely rewritten to support the new RPC call interface;
  22  *  rewrote and moved the entire XDR stuff to xdr.c
  23  *  --Olaf Kirch June 1996
  24  *
  25  *  The code below initializes all auto variables explicitly, otherwise
  26  *  it will fail to work as a module (gcc generates a memset call for an
  27  *  incomplete struct).
  28  */
  29
  30 #include <linux/types.h>
  31 #include <linux/param.h>
  32 #include <linux/time.h>
  33 #include <linux/mm.h>
  34 #include <linux/errno.h>
  35 #include <linux/string.h>
  36 #include <linux/in.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/sunrpc/clnt.h>
  39 #include <linux/nfs.h>
  40 #include <linux/nfs2.h>
  41 #include <linux/nfs_fs.h>
  42 #include <linux/nfs_page.h>
  43 #include <linux/lockd/bind.h>
  44 #include "internal.h"
  45
  46 #define NFSDBG_FACILITY         NFSDBG_PROC
  47
  48 /*
  49  * wrapper to handle the -EKEYEXPIRED error message. This should generally
  50  * only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
  51  * support the NFSERR_JUKEBOX error code, but we handle this situation in the
  52  * same way that we handle that error with NFSv3.
  53  */
  54 static int
  55 nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
  56 {
  57         int res;
  58         do {
  59                 res = rpc_call_sync(clnt, msg, flags);
  60                 if (res != -EKEYEXPIRED)
  61                         break;
  62                 schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
  63                 res = -ERESTARTSYS;
  64         } while (!fatal_signal_pending(current));
  65         return res;
  66 }
  67
  68 #define rpc_call_sync(clnt, msg, flags) nfs_rpc_wrapper(clnt, msg, flags)
  69
  70 static int
  71 nfs_async_handle_expired_key(struct rpc_task *task)
  72 {
  73         if (task->tk_status != -EKEYEXPIRED)
  74                 return 0;
  75         task->tk_status = 0;
  76         rpc_restart_call(task);
  77         rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
  78         return 1;
  79 }
  80
  81 /*
  82  * Bare-bones access to getattr: this is for nfs_read_super.
  83  */
  84 static int
  85 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  86                   struct nfs_fsinfo *info)
  87 {
  88         struct nfs_fattr *fattr = info->fattr;
  89         struct nfs2_fsstat fsinfo;
  90         struct rpc_message msg = {
  91                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
  92                 .rpc_argp       = fhandle,
  93                 .rpc_resp       = fattr,
  94         };
  95         int status;
  96
  97         dprintk("%s: call getattr\n", __func__);
  98         nfs_fattr_init(fattr);
  99         status = rpc_call_sync(server->client, &msg, 0);
 100         /* Retry with default authentication if different */
 101         if (status && server->nfs_client->cl_rpcclient != server->client)
 102                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
 103         dprintk("%s: reply getattr: %d\n", __func__, status);
 104         if (status)
 105                 return status;
 106         dprintk("%s: call statfs\n", __func__);
 107         msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
 108         msg.rpc_resp = &fsinfo;
 109         status = rpc_call_sync(server->client, &msg, 0);
 110         /* Retry with default authentication if different */
 111         if (status && server->nfs_client->cl_rpcclient != server->client)
 112                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
 113         dprintk("%s: reply statfs: %d\n", __func__, status);
 114         if (status)
 115                 return status;
 116         info->rtmax  = NFS_MAXDATA;
 117         info->rtpref = fsinfo.tsize;
 118         info->rtmult = fsinfo.bsize;
 119         info->wtmax  = NFS_MAXDATA;
 120         info->wtpref = fsinfo.tsize;
 121         info->wtmult = fsinfo.bsize;
 122         info->dtpref = fsinfo.tsize;
 123         info->maxfilesize = 0x7FFFFFFF;
 124         info->lease_time = 0;
 125         return 0;
 126 }
 127
 128 /*
 129  * One function for each procedure in the NFS protocol.
 130  */
 131 static int
 132 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 133                 struct nfs_fattr *fattr)
 134 {
 135         struct rpc_message msg = {
 136                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
 137                 .rpc_argp       = fhandle,
 138                 .rpc_resp       = fattr,
 139         };
 140         int     status;
 141
 142         dprintk("NFS call  getattr\n");
 143         nfs_fattr_init(fattr);
 144         status = rpc_call_sync(server->client, &msg, 0);
 145         dprintk("NFS reply getattr: %d\n", status);
 146         return status;
 147 }
 148
 149 static int
 150 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 151                  struct iattr *sattr)
 152 {
 153         struct inode *inode = dentry->d_inode;
 154         struct nfs_sattrargs    arg = {
 155                 .fh     = NFS_FH(inode),
 156                 .sattr  = sattr
 157         };
 158         struct rpc_message msg = {
 159                 .rpc_proc       = &nfs_procedures[NFSPROC_SETATTR],
 160                 .rpc_argp       = &arg,
 161                 .rpc_resp       = fattr,
 162         };
 163         int     status;
 164
 165         /* Mask out the non-modebit related stuff from attr->ia_mode */
 166         sattr->ia_mode &= S_IALLUGO;
 167
 168         dprintk("NFS call  setattr\n");
 169         if (sattr->ia_valid & ATTR_FILE)
 170                 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 171         nfs_fattr_init(fattr);
 172         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 173         if (status == 0)
 174                 nfs_setattr_update_inode(inode, sattr);
 175         dprintk("NFS reply setattr: %d\n", status);
 176         return status;
 177 }
 178
 179 static int
 180 nfs_proc_lookup(struct inode *dir, struct qstr *name,
 181                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 182 {
 183         struct nfs_diropargs    arg = {
 184                 .fh             = NFS_FH(dir),
 185                 .name           = name->name,
 186                 .len            = name->len
 187         };
 188         struct nfs_diropok      res = {
 189                 .fh             = fhandle,
 190                 .fattr          = fattr
 191         };
 192         struct rpc_message msg = {
 193                 .rpc_proc       = &nfs_procedures[NFSPROC_LOOKUP],
 194                 .rpc_argp       = &arg,
 195                 .rpc_resp       = &res,
 196         };
 197         int                     status;
 198
 199         dprintk("NFS call  lookup %s\n", name->name);
 200         nfs_fattr_init(fattr);
 201         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 202         dprintk("NFS reply lookup: %d\n", status);
 203         return status;
 204 }
 205
 206 static int nfs_proc_readlink(struct inode *inode, struct page *page,
 207                 unsigned int pgbase, unsigned int pglen)
 208 {
 209         struct nfs_readlinkargs args = {
 210                 .fh             = NFS_FH(inode),
 211                 .pgbase         = pgbase,
 212                 .pglen          = pglen,
 213                 .pages          = &page
 214         };
 215         struct rpc_message msg = {
 216                 .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 217                 .rpc_argp       = &args,
 218         };
 219         int                     status;
 220
 221         dprintk("NFS call  readlink\n");
 222         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 223         dprintk("NFS reply readlink: %d\n", status);
 224         return status;
 225 }
 226
 227 static int
 228 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 229                 int flags, struct nameidata *nd)
 230 {
 231         struct nfs_fh           fhandle;
 232         struct nfs_fattr        fattr;
 233         struct nfs_createargs   arg = {
 234                 .fh             = NFS_FH(dir),
 235                 .name           = dentry->d_name.name,
 236                 .len            = dentry->d_name.len,
 237                 .sattr          = sattr
 238         };
 239         struct nfs_diropok      res = {
 240                 .fh             = &fhandle,
 241                 .fattr          = &fattr
 242         };
 243         struct rpc_message msg = {
 244                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 245                 .rpc_argp       = &arg,
 246                 .rpc_resp       = &res,
 247         };
 248         int                     status;
 249
 250         nfs_fattr_init(&fattr);
 251         dprintk("NFS call  create %s\n", dentry->d_name.name);
 252         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 253         nfs_mark_for_revalidate(dir);
 254         if (status == 0)
 255                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 256         dprintk("NFS reply create: %d\n", status);
 257         return status;
 258 }
 259
 260 /*
 261  * In NFSv2, mknod is grafted onto the create call.
 262  */
 263 static int
 264 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 265                dev_t rdev)
 266 {
 267         struct nfs_fh fhandle;
 268         struct nfs_fattr fattr;
 269         struct nfs_createargs   arg = {
 270                 .fh             = NFS_FH(dir),
 271                 .name           = dentry->d_name.name,
 272                 .len            = dentry->d_name.len,
 273                 .sattr          = sattr
 274         };
 275         struct nfs_diropok      res = {
 276                 .fh             = &fhandle,
 277                 .fattr          = &fattr
 278         };
 279         struct rpc_message msg = {
 280                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 281                 .rpc_argp       = &arg,
 282                 .rpc_resp       = &res,
 283         };
 284         int status, mode;
 285
 286         dprintk("NFS call  mknod %s\n", dentry->d_name.name);
 287
 288         mode = sattr->ia_mode;
 289         if (S_ISFIFO(mode)) {
 290                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 291                 sattr->ia_valid &= ~ATTR_SIZE;
 292         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 293                 sattr->ia_valid |= ATTR_SIZE;
 294                 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 295         }
 296
 297         nfs_fattr_init(&fattr);
 298         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 299         nfs_mark_for_revalidate(dir);
 300
 301         if (status == -EINVAL && S_ISFIFO(mode)) {
 302                 sattr->ia_mode = mode;
 303                 nfs_fattr_init(&fattr);
 304                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 305         }
 306         if (status == 0)
 307                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 308         dprintk("NFS reply mknod: %d\n", status);
 309         return status;
 310 }
 311
 312 static int
 313 nfs_proc_remove(struct inode *dir, struct qstr *name)
 314 {
 315         struct nfs_removeargs arg = {
 316                 .fh = NFS_FH(dir),
 317                 .name.len = name->len,
 318                 .name.name = name->name,
 319         };
 320         struct rpc_message msg = {
 321                 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
 322                 .rpc_argp = &arg,
 323         };
 324         int                     status;
 325
 326         dprintk("NFS call  remove %s\n", name->name);
 327         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 328         nfs_mark_for_revalidate(dir);
 329
 330         dprintk("NFS reply remove: %d\n", status);
 331         return status;
 332 }
 333
 334 static void
 335 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 336 {
 337         msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 338 }
 339
 340 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 341 {
 342         if (nfs_async_handle_expired_key(task))
 343                 return 0;
 344         nfs_mark_for_revalidate(dir);
 345         return 1;
 346 }
 347
 348 static int
 349 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 350                 struct inode *new_dir, struct qstr *new_name)
 351 {
 352         struct nfs_renameargs   arg = {
 353                 .fromfh         = NFS_FH(old_dir),
 354                 .fromname       = old_name->name,
 355                 .fromlen        = old_name->len,
 356                 .tofh           = NFS_FH(new_dir),
 357                 .toname         = new_name->name,
 358                 .tolen          = new_name->len
 359         };
 360         struct rpc_message msg = {
 361                 .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 362                 .rpc_argp       = &arg,
 363         };
 364         int                     status;
 365
 366         dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 367         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 368         nfs_mark_for_revalidate(old_dir);
 369         nfs_mark_for_revalidate(new_dir);
 370         dprintk("NFS reply rename: %d\n", status);
 371         return status;
 372 }
 373
 374 static int
 375 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 376 {
 377         struct nfs_linkargs     arg = {
 378                 .fromfh         = NFS_FH(inode),
 379                 .tofh           = NFS_FH(dir),
 380                 .toname         = name->name,
 381                 .tolen          = name->len
 382         };
 383         struct rpc_message msg = {
 384                 .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 385                 .rpc_argp       = &arg,
 386         };
 387         int                     status;
 388
 389         dprintk("NFS call  link %s\n", name->name);
 390         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 391         nfs_mark_for_revalidate(inode);
 392         nfs_mark_for_revalidate(dir);
 393         dprintk("NFS reply link: %d\n", status);
 394         return status;
 395 }
 396
 397 static int
 398 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 399                  unsigned int len, struct iattr *sattr)
 400 {
 401         struct nfs_fh fhandle;
 402         struct nfs_fattr fattr;
 403         struct nfs_symlinkargs  arg = {
 404                 .fromfh         = NFS_FH(dir),
 405                 .fromname       = dentry->d_name.name,
 406                 .fromlen        = dentry->d_name.len,
 407                 .pages          = &page,
 408                 .pathlen        = len,
 409                 .sattr          = sattr
 410         };
 411         struct rpc_message msg = {
 412                 .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 413                 .rpc_argp       = &arg,
 414         };
 415         int                     status;
 416
 417         if (len > NFS2_MAXPATHLEN)
 418                 return -ENAMETOOLONG;
 419
 420         dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 421
 422         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 423         nfs_mark_for_revalidate(dir);
 424
 425         /*
 426          * V2 SYMLINK requests don't return any attributes.  Setting the
 427          * filehandle size to zero indicates to nfs_instantiate that it
 428          * should fill in the data with a LOOKUP call on the wire.
 429          */
 430         if (status == 0) {
 431                 nfs_fattr_init(&fattr);
 432                 fhandle.size = 0;
 433                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 434         }
 435
 436         dprintk("NFS reply symlink: %d\n", status);
 437         return status;
 438 }
 439
 440 static int
 441 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 442 {
 443         struct nfs_fh fhandle;
 444         struct nfs_fattr fattr;
 445         struct nfs_createargs   arg = {
 446                 .fh             = NFS_FH(dir),
 447                 .name           = dentry->d_name.name,
 448                 .len            = dentry->d_name.len,
 449                 .sattr          = sattr
 450         };
 451         struct nfs_diropok      res = {
 452                 .fh             = &fhandle,
 453                 .fattr          = &fattr
 454         };
 455         struct rpc_message msg = {
 456                 .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 457                 .rpc_argp       = &arg,
 458                 .rpc_resp       = &res,
 459         };
 460         int                     status;
 461
 462         dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 463         nfs_fattr_init(&fattr);
 464         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 465         nfs_mark_for_revalidate(dir);
 466         if (status == 0)
 467                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 468         dprintk("NFS reply mkdir: %d\n", status);
 469         return status;
 470 }
 471
 472 static int
 473 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 474 {
 475         struct nfs_diropargs    arg = {
 476                 .fh             = NFS_FH(dir),
 477                 .name           = name->name,
 478                 .len            = name->len
 479         };
 480         struct rpc_message msg = {
 481                 .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 482                 .rpc_argp       = &arg,
 483         };
 484         int                     status;
 485
 486         dprintk("NFS call  rmdir %s\n", name->name);
 487         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 488         nfs_mark_for_revalidate(dir);
 489         dprintk("NFS reply rmdir: %d\n", status);
 490         return status;
 491 }
 492
 493 /*
 494  * The READDIR implementation is somewhat hackish - we pass a temporary
 495  * buffer to the encode function, which installs it in the receive
 496  * the receive iovec. The decode function just parses the reply to make
 497  * sure it is syntactically correct; the entries itself are decoded
 498  * from nfs_readdir by calling the decode_entry function directly.
 499  */
 500 static int
 501 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 502                  u64 cookie, struct page *page, unsigned int count, int plus)
 503 {
 504         struct inode            *dir = dentry->d_inode;
 505         struct nfs_readdirargs  arg = {
 506                 .fh             = NFS_FH(dir),
 507                 .cookie         = cookie,
 508                 .count          = count,
 509                 .pages          = &page,
 510         };
 511         struct rpc_message      msg = {
 512                 .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 513                 .rpc_argp       = &arg,
 514                 .rpc_cred       = cred,
 515         };
 516         int                     status;
 517
 518         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 519         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 520
 521         nfs_invalidate_atime(dir);
 522
 523         dprintk("NFS reply readdir: %d\n", status);
 524         return status;
 525 }
 526
 527 static int
 528 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 529                         struct nfs_fsstat *stat)
 530 {
 531         struct nfs2_fsstat fsinfo;
 532         struct rpc_message msg = {
 533                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 534                 .rpc_argp       = fhandle,
 535                 .rpc_resp       = &fsinfo,
 536         };
 537         int     status;
 538
 539         dprintk("NFS call  statfs\n");
 540         nfs_fattr_init(stat->fattr);
 541         status = rpc_call_sync(server->client, &msg, 0);
 542         dprintk("NFS reply statfs: %d\n", status);
 543         if (status)
 544                 goto out;
 545         stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 546         stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 547         stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 548         stat->tfiles = 0;
 549         stat->ffiles = 0;
 550         stat->afiles = 0;
 551 out:
 552         return status;
 553 }
 554
 555 static int
 556 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 557                         struct nfs_fsinfo *info)
 558 {
 559         struct nfs2_fsstat fsinfo;
 560         struct rpc_message msg = {
 561                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 562                 .rpc_argp       = fhandle,
 563                 .rpc_resp       = &fsinfo,
 564         };
 565         int     status;
 566
 567         dprintk("NFS call  fsinfo\n");
 568         nfs_fattr_init(info->fattr);
 569         status = rpc_call_sync(server->client, &msg, 0);
 570         dprintk("NFS reply fsinfo: %d\n", status);
 571         if (status)
 572                 goto out;
 573         info->rtmax  = NFS_MAXDATA;
 574         info->rtpref = fsinfo.tsize;
 575         info->rtmult = fsinfo.bsize;
 576         info->wtmax  = NFS_MAXDATA;
 577         info->wtpref = fsinfo.tsize;
 578         info->wtmult = fsinfo.bsize;
 579         info->dtpref = fsinfo.tsize;
 580         info->maxfilesize = 0x7FFFFFFF;
 581         info->lease_time = 0;
 582 out:
 583         return status;
 584 }
 585
 586 static int
 587 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 588                   struct nfs_pathconf *info)
 589 {
 590         info->max_link = 0;
 591         info->max_namelen = NFS2_MAXNAMLEN;
 592         return 0;
 593 }
 594
 595 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 596 {
 597         if (nfs_async_handle_expired_key(task))
 598                 return -EAGAIN;
 599
 600         nfs_invalidate_atime(data->inode);
 601         if (task->tk_status >= 0) {
 602                 nfs_refresh_inode(data->inode, data->res.fattr);
 603                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 604                  * as it is guaranteed to always return the file attributes
 605                  */
 606                 if (data->args.offset + data->args.count >= data->res.fattr->size)
 607                         data->res.eof = 1;
 608         }
 609         return 0;
 610 }
 611
 612 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 613 {
 614         msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 615 }
 616
 617 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 618 {
 619         if (nfs_async_handle_expired_key(task))
 620                 return -EAGAIN;
 621
 622         if (task->tk_status >= 0)
 623                 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
 624         return 0;
 625 }
 626
 627 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 628 {
 629         /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 630         data->args.stable = NFS_FILE_SYNC;
 631         msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 632 }
 633
 634 static void
 635 nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
 636 {
 637         BUG();
 638 }
 639
 640 static int
 641 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 642 {
 643         struct inode *inode = filp->f_path.dentry->d_inode;
 644
 645         return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 646 }
 647
 648 /* Helper functions for NFS lock bounds checking */
 649 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 650 static int nfs_lock_check_bounds(const struct file_lock *fl)
 651 {
 652         __s32 start, end;
 653
 654         start = (__s32)fl->fl_start;
 655         if ((loff_t)start != fl->fl_start)
 656                 goto out_einval;
 657
 658         if (fl->fl_end != OFFSET_MAX) {
 659                 end = (__s32)fl->fl_end;
 660                 if ((loff_t)end != fl->fl_end)
 661                         goto out_einval;
 662         } else
 663                 end = NFS_LOCK32_OFFSET_MAX;
 664
 665         if (start < 0 || start > end)
 666                 goto out_einval;
 667         return 0;
 668 out_einval:
 669         return -EINVAL;
 670 }
 671
 672 const struct nfs_rpc_ops nfs_v2_clientops = {
 673         .version        = 2,                   /* protocol version */
 674         .dentry_ops     = &nfs_dentry_operations,
 675         .dir_inode_ops  = &nfs_dir_inode_operations,
 676         .file_inode_ops = &nfs_file_inode_operations,
 677         .getroot        = nfs_proc_get_root,
 678         .getattr        = nfs_proc_getattr,
 679         .setattr        = nfs_proc_setattr,
 680         .lookup         = nfs_proc_lookup,
 681         .access         = NULL,                /* access */
 682         .readlink       = nfs_proc_readlink,
 683         .create         = nfs_proc_create,
 684         .remove         = nfs_proc_remove,
 685         .unlink_setup   = nfs_proc_unlink_setup,
 686         .unlink_done    = nfs_proc_unlink_done,
 687         .rename         = nfs_proc_rename,
 688         .link           = nfs_proc_link,
 689         .symlink        = nfs_proc_symlink,
 690         .mkdir          = nfs_proc_mkdir,
 691         .rmdir          = nfs_proc_rmdir,
 692         .readdir        = nfs_proc_readdir,
 693         .mknod          = nfs_proc_mknod,
 694         .statfs         = nfs_proc_statfs,
 695         .fsinfo         = nfs_proc_fsinfo,
 696         .pathconf       = nfs_proc_pathconf,
 697         .decode_dirent  = nfs_decode_dirent,
 698         .read_setup     = nfs_proc_read_setup,
 699         .read_done      = nfs_read_done,
 700         .write_setup    = nfs_proc_write_setup,
 701         .write_done     = nfs_write_done,
 702         .commit_setup   = nfs_proc_commit_setup,
 703         .lock           = nfs_proc_lock,
 704         .lock_check_bounds = nfs_lock_check_bounds,
 705         .close_context  = nfs_close_context,
 706 };