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/slab.h>
  33 #include <linux/time.h>
  34 #include <linux/mm.h>
  35 #include <linux/utsname.h>
  36 #include <linux/errno.h>
  37 #include <linux/string.h>
  38 #include <linux/in.h>
  39 #include <linux/pagemap.h>
  40 #include <linux/sunrpc/clnt.h>
  41 #include <linux/nfs.h>
  42 #include <linux/nfs2.h>
  43 #include <linux/nfs_fs.h>
  44 #include <linux/nfs_page.h>
  45 #include <linux/lockd/bind.h>
  46 #include <linux/smp_lock.h>
  47
  48 #define NFSDBG_FACILITY         NFSDBG_PROC
  49
  50 extern struct rpc_procinfo nfs_procedures[];
  51
  52 /*
  53  * Bare-bones access to getattr: this is for nfs_read_super.
  54  */
  55 static int
  56 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  57                   struct nfs_fsinfo *info)
  58 {
  59         struct nfs_fattr *fattr = info->fattr;
  60         struct nfs2_fsstat fsinfo;
  61         struct rpc_message msg = {
  62                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
  63                 .rpc_argp       = fhandle,
  64                 .rpc_resp       = fattr,
  65         };
  66         int status;
  67
  68         dprintk("%s: call getattr\n", __FUNCTION__);
  69         nfs_fattr_init(fattr);
  70         status = rpc_call_sync(server->client_sys, &msg, 0);
  71         dprintk("%s: reply getattr: %d\n", __FUNCTION__, status);
  72         if (status)
  73                 return status;
  74         dprintk("%s: call statfs\n", __FUNCTION__);
  75         msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
  76         msg.rpc_resp = &fsinfo;
  77         status = rpc_call_sync(server->client_sys, &msg, 0);
  78         dprintk("%s: reply statfs: %d\n", __FUNCTION__, status);
  79         if (status)
  80                 return status;
  81         info->rtmax  = NFS_MAXDATA;
  82         info->rtpref = fsinfo.tsize;
  83         info->rtmult = fsinfo.bsize;
  84         info->wtmax  = NFS_MAXDATA;
  85         info->wtpref = fsinfo.tsize;
  86         info->wtmult = fsinfo.bsize;
  87         info->dtpref = fsinfo.tsize;
  88         info->maxfilesize = 0x7FFFFFFF;
  89         info->lease_time = 0;
  90         return 0;
  91 }
  92
  93 /*
  94  * One function for each procedure in the NFS protocol.
  95  */
  96 static int
  97 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  98                 struct nfs_fattr *fattr)
  99 {
 100         struct rpc_message msg = {
 101                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
 102                 .rpc_argp       = fhandle,
 103                 .rpc_resp       = fattr,
 104         };
 105         int     status;
 106
 107         dprintk("NFS call  getattr\n");
 108         nfs_fattr_init(fattr);
 109         status = rpc_call_sync(server->client, &msg, 0);
 110         dprintk("NFS reply getattr: %d\n", status);
 111         return status;
 112 }
 113
 114 static int
 115 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 116                  struct iattr *sattr)
 117 {
 118         struct inode *inode = dentry->d_inode;
 119         struct nfs_sattrargs    arg = {
 120                 .fh     = NFS_FH(inode),
 121                 .sattr  = sattr
 122         };
 123         struct rpc_message msg = {
 124                 .rpc_proc       = &nfs_procedures[NFSPROC_SETATTR],
 125                 .rpc_argp       = &arg,
 126                 .rpc_resp       = fattr,
 127         };
 128         int     status;
 129
 130         /* Mask out the non-modebit related stuff from attr->ia_mode */
 131         sattr->ia_mode &= S_IALLUGO;
 132
 133         dprintk("NFS call  setattr\n");
 134         nfs_fattr_init(fattr);
 135         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 136         if (status == 0)
 137                 nfs_setattr_update_inode(inode, sattr);
 138         dprintk("NFS reply setattr: %d\n", status);
 139         return status;
 140 }
 141
 142 static int
 143 nfs_proc_lookup(struct inode *dir, struct qstr *name,
 144                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 145 {
 146         struct nfs_diropargs    arg = {
 147                 .fh             = NFS_FH(dir),
 148                 .name           = name->name,
 149                 .len            = name->len
 150         };
 151         struct nfs_diropok      res = {
 152                 .fh             = fhandle,
 153                 .fattr          = fattr
 154         };
 155         struct rpc_message msg = {
 156                 .rpc_proc       = &nfs_procedures[NFSPROC_LOOKUP],
 157                 .rpc_argp       = &arg,
 158                 .rpc_resp       = &res,
 159         };
 160         int                     status;
 161
 162         dprintk("NFS call  lookup %s\n", name->name);
 163         nfs_fattr_init(fattr);
 164         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 165         dprintk("NFS reply lookup: %d\n", status);
 166         return status;
 167 }
 168
 169 static int nfs_proc_readlink(struct inode *inode, struct page *page,
 170                 unsigned int pgbase, unsigned int pglen)
 171 {
 172         struct nfs_readlinkargs args = {
 173                 .fh             = NFS_FH(inode),
 174                 .pgbase         = pgbase,
 175                 .pglen          = pglen,
 176                 .pages          = &page
 177         };
 178         struct rpc_message msg = {
 179                 .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 180                 .rpc_argp       = &args,
 181         };
 182         int                     status;
 183
 184         dprintk("NFS call  readlink\n");
 185         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 186         dprintk("NFS reply readlink: %d\n", status);
 187         return status;
 188 }
 189
 190 static int nfs_proc_read(struct nfs_read_data *rdata)
 191 {
 192         int                     flags = rdata->flags;
 193         struct inode *          inode = rdata->inode;
 194         struct nfs_fattr *      fattr = rdata->res.fattr;
 195         struct rpc_message      msg = {
 196                 .rpc_proc       = &nfs_procedures[NFSPROC_READ],
 197                 .rpc_argp       = &rdata->args,
 198                 .rpc_resp       = &rdata->res,
 199                 .rpc_cred       = rdata->cred,
 200         };
 201         int                     status;
 202
 203         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
 204                         (long long) rdata->args.offset);
 205         nfs_fattr_init(fattr);
 206         status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
 207         if (status >= 0) {
 208                 nfs_refresh_inode(inode, fattr);
 209                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 210                  * as it is guaranteed to always return the file attributes
 211                  */
 212                 if (rdata->args.offset + rdata->args.count >= fattr->size)
 213                         rdata->res.eof = 1;
 214         }
 215         dprintk("NFS reply read: %d\n", status);
 216         return status;
 217 }
 218
 219 static int nfs_proc_write(struct nfs_write_data *wdata)
 220 {
 221         int                     flags = wdata->flags;
 222         struct inode *          inode = wdata->inode;
 223         struct nfs_fattr *      fattr = wdata->res.fattr;
 224         struct rpc_message      msg = {
 225                 .rpc_proc       = &nfs_procedures[NFSPROC_WRITE],
 226                 .rpc_argp       = &wdata->args,
 227                 .rpc_resp       = &wdata->res,
 228                 .rpc_cred       = wdata->cred,
 229         };
 230         int                     status;
 231
 232         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
 233                         (long long) wdata->args.offset);
 234         nfs_fattr_init(fattr);
 235         status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
 236         if (status >= 0) {
 237                 nfs_post_op_update_inode(inode, fattr);
 238                 wdata->res.count = wdata->args.count;
 239                 wdata->verf.committed = NFS_FILE_SYNC;
 240         }
 241         dprintk("NFS reply write: %d\n", status);
 242         return status < 0? status : wdata->res.count;
 243 }
 244
 245 static int
 246 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 247                 int flags, struct nameidata *nd)
 248 {
 249         struct nfs_fh           fhandle;
 250         struct nfs_fattr        fattr;
 251         struct nfs_createargs   arg = {
 252                 .fh             = NFS_FH(dir),
 253                 .name           = dentry->d_name.name,
 254                 .len            = dentry->d_name.len,
 255                 .sattr          = sattr
 256         };
 257         struct nfs_diropok      res = {
 258                 .fh             = &fhandle,
 259                 .fattr          = &fattr
 260         };
 261         struct rpc_message msg = {
 262                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 263                 .rpc_argp       = &arg,
 264                 .rpc_resp       = &res,
 265         };
 266         int                     status;
 267
 268         nfs_fattr_init(&fattr);
 269         dprintk("NFS call  create %s\n", dentry->d_name.name);
 270         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 271         if (status == 0)
 272                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 273         dprintk("NFS reply create: %d\n", status);
 274         return status;
 275 }
 276
 277 /*
 278  * In NFSv2, mknod is grafted onto the create call.
 279  */
 280 static int
 281 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 282                dev_t rdev)
 283 {
 284         struct nfs_fh fhandle;
 285         struct nfs_fattr fattr;
 286         struct nfs_createargs   arg = {
 287                 .fh             = NFS_FH(dir),
 288                 .name           = dentry->d_name.name,
 289                 .len            = dentry->d_name.len,
 290                 .sattr          = sattr
 291         };
 292         struct nfs_diropok      res = {
 293                 .fh             = &fhandle,
 294                 .fattr          = &fattr
 295         };
 296         struct rpc_message msg = {
 297                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 298                 .rpc_argp       = &arg,
 299                 .rpc_resp       = &res,
 300         };
 301         int status, mode;
 302
 303         dprintk("NFS call  mknod %s\n", dentry->d_name.name);
 304
 305         mode = sattr->ia_mode;
 306         if (S_ISFIFO(mode)) {
 307                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 308                 sattr->ia_valid &= ~ATTR_SIZE;
 309         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 310                 sattr->ia_valid |= ATTR_SIZE;
 311                 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 312         }
 313
 314         nfs_fattr_init(&fattr);
 315         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 316         nfs_mark_for_revalidate(dir);
 317
 318         if (status == -EINVAL && S_ISFIFO(mode)) {
 319                 sattr->ia_mode = mode;
 320                 nfs_fattr_init(&fattr);
 321                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 322         }
 323         if (status == 0)
 324                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 325         dprintk("NFS reply mknod: %d\n", status);
 326         return status;
 327 }
 328
 329 static int
 330 nfs_proc_remove(struct inode *dir, struct qstr *name)
 331 {
 332         struct nfs_diropargs    arg = {
 333                 .fh             = NFS_FH(dir),
 334                 .name           = name->name,
 335                 .len            = name->len
 336         };
 337         struct rpc_message      msg = {
 338                 .rpc_proc       = &nfs_procedures[NFSPROC_REMOVE],
 339                 .rpc_argp       = &arg,
 340         };
 341         int                     status;
 342
 343         dprintk("NFS call  remove %s\n", name->name);
 344         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 345         nfs_mark_for_revalidate(dir);
 346
 347         dprintk("NFS reply remove: %d\n", status);
 348         return status;
 349 }
 350
 351 static int
 352 nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
 353 {
 354         struct nfs_diropargs    *arg;
 355
 356         arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL);
 357         if (!arg)
 358                 return -ENOMEM;
 359         arg->fh = NFS_FH(dir->d_inode);
 360         arg->name = name->name;
 361         arg->len = name->len;
 362         msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 363         msg->rpc_argp = arg;
 364         return 0;
 365 }
 366
 367 static int
 368 nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
 369 {
 370         struct rpc_message *msg = &task->tk_msg;
 371
 372         if (msg->rpc_argp) {
 373                 nfs_mark_for_revalidate(dir->d_inode);
 374                 kfree(msg->rpc_argp);
 375         }
 376         return 0;
 377 }
 378
 379 static int
 380 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 381                 struct inode *new_dir, struct qstr *new_name)
 382 {
 383         struct nfs_renameargs   arg = {
 384                 .fromfh         = NFS_FH(old_dir),
 385                 .fromname       = old_name->name,
 386                 .fromlen        = old_name->len,
 387                 .tofh           = NFS_FH(new_dir),
 388                 .toname         = new_name->name,
 389                 .tolen          = new_name->len
 390         };
 391         struct rpc_message msg = {
 392                 .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 393                 .rpc_argp       = &arg,
 394         };
 395         int                     status;
 396
 397         dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 398         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 399         nfs_mark_for_revalidate(old_dir);
 400         nfs_mark_for_revalidate(new_dir);
 401         dprintk("NFS reply rename: %d\n", status);
 402         return status;
 403 }
 404
 405 static int
 406 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 407 {
 408         struct nfs_linkargs     arg = {
 409                 .fromfh         = NFS_FH(inode),
 410                 .tofh           = NFS_FH(dir),
 411                 .toname         = name->name,
 412                 .tolen          = name->len
 413         };
 414         struct rpc_message msg = {
 415                 .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 416                 .rpc_argp       = &arg,
 417         };
 418         int                     status;
 419
 420         dprintk("NFS call  link %s\n", name->name);
 421         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 422         nfs_mark_for_revalidate(inode);
 423         nfs_mark_for_revalidate(dir);
 424         dprintk("NFS reply link: %d\n", status);
 425         return status;
 426 }
 427
 428 static int
 429 nfs_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,
 430                  struct iattr *sattr, struct nfs_fh *fhandle,
 431                  struct nfs_fattr *fattr)
 432 {
 433         struct nfs_symlinkargs  arg = {
 434                 .fromfh         = NFS_FH(dir),
 435                 .fromname       = name->name,
 436                 .fromlen        = name->len,
 437                 .topath         = path->name,
 438                 .tolen          = path->len,
 439                 .sattr          = sattr
 440         };
 441         struct rpc_message msg = {
 442                 .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 443                 .rpc_argp       = &arg,
 444         };
 445         int                     status;
 446
 447         if (path->len > NFS2_MAXPATHLEN)
 448                 return -ENAMETOOLONG;
 449         dprintk("NFS call  symlink %s -> %s\n", name->name, path->name);
 450         nfs_fattr_init(fattr);
 451         fhandle->size = 0;
 452         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 453         nfs_mark_for_revalidate(dir);
 454         dprintk("NFS reply symlink: %d\n", status);
 455         return status;
 456 }
 457
 458 static int
 459 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 460 {
 461         struct nfs_fh fhandle;
 462         struct nfs_fattr fattr;
 463         struct nfs_createargs   arg = {
 464                 .fh             = NFS_FH(dir),
 465                 .name           = dentry->d_name.name,
 466                 .len            = dentry->d_name.len,
 467                 .sattr          = sattr
 468         };
 469         struct nfs_diropok      res = {
 470                 .fh             = &fhandle,
 471                 .fattr          = &fattr
 472         };
 473         struct rpc_message msg = {
 474                 .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 475                 .rpc_argp       = &arg,
 476                 .rpc_resp       = &res,
 477         };
 478         int                     status;
 479
 480         dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 481         nfs_fattr_init(&fattr);
 482         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 483         nfs_mark_for_revalidate(dir);
 484         if (status == 0)
 485                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 486         dprintk("NFS reply mkdir: %d\n", status);
 487         return status;
 488 }
 489
 490 static int
 491 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 492 {
 493         struct nfs_diropargs    arg = {
 494                 .fh             = NFS_FH(dir),
 495                 .name           = name->name,
 496                 .len            = name->len
 497         };
 498         struct rpc_message msg = {
 499                 .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 500                 .rpc_argp       = &arg,
 501         };
 502         int                     status;
 503
 504         dprintk("NFS call  rmdir %s\n", name->name);
 505         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 506         nfs_mark_for_revalidate(dir);
 507         dprintk("NFS reply rmdir: %d\n", status);
 508         return status;
 509 }
 510
 511 /*
 512  * The READDIR implementation is somewhat hackish - we pass a temporary
 513  * buffer to the encode function, which installs it in the receive
 514  * the receive iovec. The decode function just parses the reply to make
 515  * sure it is syntactically correct; the entries itself are decoded
 516  * from nfs_readdir by calling the decode_entry function directly.
 517  */
 518 static int
 519 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 520                  u64 cookie, struct page *page, unsigned int count, int plus)
 521 {
 522         struct inode            *dir = dentry->d_inode;
 523         struct nfs_readdirargs  arg = {
 524                 .fh             = NFS_FH(dir),
 525                 .cookie         = cookie,
 526                 .count          = count,
 527                 .pages          = &page,
 528         };
 529         struct rpc_message      msg = {
 530                 .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 531                 .rpc_argp       = &arg,
 532                 .rpc_cred       = cred,
 533         };
 534         int                     status;
 535
 536         lock_kernel();
 537
 538         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 539         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 540
 541         dprintk("NFS reply readdir: %d\n", status);
 542         unlock_kernel();
 543         return status;
 544 }
 545
 546 static int
 547 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 548                         struct nfs_fsstat *stat)
 549 {
 550         struct nfs2_fsstat fsinfo;
 551         struct rpc_message msg = {
 552                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 553                 .rpc_argp       = fhandle,
 554                 .rpc_resp       = &fsinfo,
 555         };
 556         int     status;
 557
 558         dprintk("NFS call  statfs\n");
 559         nfs_fattr_init(stat->fattr);
 560         status = rpc_call_sync(server->client, &msg, 0);
 561         dprintk("NFS reply statfs: %d\n", status);
 562         if (status)
 563                 goto out;
 564         stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 565         stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 566         stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 567         stat->tfiles = 0;
 568         stat->ffiles = 0;
 569         stat->afiles = 0;
 570 out:
 571         return status;
 572 }
 573
 574 static int
 575 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 576                         struct nfs_fsinfo *info)
 577 {
 578         struct nfs2_fsstat fsinfo;
 579         struct rpc_message msg = {
 580                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 581                 .rpc_argp       = fhandle,
 582                 .rpc_resp       = &fsinfo,
 583         };
 584         int     status;
 585
 586         dprintk("NFS call  fsinfo\n");
 587         nfs_fattr_init(info->fattr);
 588         status = rpc_call_sync(server->client, &msg, 0);
 589         dprintk("NFS reply fsinfo: %d\n", status);
 590         if (status)
 591                 goto out;
 592         info->rtmax  = NFS_MAXDATA;
 593         info->rtpref = fsinfo.tsize;
 594         info->rtmult = fsinfo.bsize;
 595         info->wtmax  = NFS_MAXDATA;
 596         info->wtpref = fsinfo.tsize;
 597         info->wtmult = fsinfo.bsize;
 598         info->dtpref = fsinfo.tsize;
 599         info->maxfilesize = 0x7FFFFFFF;
 600         info->lease_time = 0;
 601 out:
 602         return status;
 603 }
 604
 605 static int
 606 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 607                   struct nfs_pathconf *info)
 608 {
 609         info->max_link = 0;
 610         info->max_namelen = NFS2_MAXNAMLEN;
 611         return 0;
 612 }
 613
 614 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
 615
 616 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 617 {
 618         if (task->tk_status >= 0) {
 619                 nfs_refresh_inode(data->inode, data->res.fattr);
 620                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 621                  * as it is guaranteed to always return the file attributes
 622                  */
 623                 if (data->args.offset + data->args.count >= data->res.fattr->size)
 624                         data->res.eof = 1;
 625         }
 626         return 0;
 627 }
 628
 629 static void nfs_proc_read_setup(struct nfs_read_data *data)
 630 {
 631         struct rpc_message      msg = {
 632                 .rpc_proc       = &nfs_procedures[NFSPROC_READ],
 633                 .rpc_argp       = &data->args,
 634                 .rpc_resp       = &data->res,
 635                 .rpc_cred       = data->cred,
 636         };
 637
 638         rpc_call_setup(&data->task, &msg, 0);
 639 }
 640
 641 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 642 {
 643         if (task->tk_status >= 0)
 644                 nfs_post_op_update_inode(data->inode, data->res.fattr);
 645         return 0;
 646 }
 647
 648 static void nfs_proc_write_setup(struct nfs_write_data *data, int how)
 649 {
 650         struct rpc_message      msg = {
 651                 .rpc_proc       = &nfs_procedures[NFSPROC_WRITE],
 652                 .rpc_argp       = &data->args,
 653                 .rpc_resp       = &data->res,
 654                 .rpc_cred       = data->cred,
 655         };
 656
 657         /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 658         data->args.stable = NFS_FILE_SYNC;
 659
 660         /* Finalize the task. */
 661         rpc_call_setup(&data->task, &msg, 0);
 662 }
 663
 664 static void
 665 nfs_proc_commit_setup(struct nfs_write_data *data, int how)
 666 {
 667         BUG();
 668 }
 669
 670 static int
 671 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 672 {
 673         return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl);
 674 }
 675
 676
 677 struct nfs_rpc_ops      nfs_v2_clientops = {
 678         .version        = 2,                   /* protocol version */
 679         .dentry_ops     = &nfs_dentry_operations,
 680         .dir_inode_ops  = &nfs_dir_inode_operations,
 681         .file_inode_ops = &nfs_file_inode_operations,
 682         .getroot        = nfs_proc_get_root,
 683         .getattr        = nfs_proc_getattr,
 684         .setattr        = nfs_proc_setattr,
 685         .lookup         = nfs_proc_lookup,
 686         .access         = NULL,                /* access */
 687         .readlink       = nfs_proc_readlink,
 688         .read           = nfs_proc_read,
 689         .write          = nfs_proc_write,
 690         .commit         = NULL,                /* commit */
 691         .create         = nfs_proc_create,
 692         .remove         = nfs_proc_remove,
 693         .unlink_setup   = nfs_proc_unlink_setup,
 694         .unlink_done    = nfs_proc_unlink_done,
 695         .rename         = nfs_proc_rename,
 696         .link           = nfs_proc_link,
 697         .symlink        = nfs_proc_symlink,
 698         .mkdir          = nfs_proc_mkdir,
 699         .rmdir          = nfs_proc_rmdir,
 700         .readdir        = nfs_proc_readdir,
 701         .mknod          = nfs_proc_mknod,
 702         .statfs         = nfs_proc_statfs,
 703         .fsinfo         = nfs_proc_fsinfo,
 704         .pathconf       = nfs_proc_pathconf,
 705         .decode_dirent  = nfs_decode_dirent,
 706         .read_setup     = nfs_proc_read_setup,
 707         .read_done      = nfs_read_done,
 708         .write_setup    = nfs_proc_write_setup,
 709         .write_done     = nfs_write_done,
 710         .commit_setup   = nfs_proc_commit_setup,
 711         .file_open      = nfs_open,
 712         .file_release   = nfs_release,
 713         .lock           = nfs_proc_lock,
 714 };