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 #include "internal.h"
  48
  49 #define NFSDBG_FACILITY         NFSDBG_PROC
  50
  51 /*
  52  * Bare-bones access to getattr: this is for nfs_read_super.
  53  */
  54 static int
  55 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  56                   struct nfs_fsinfo *info)
  57 {
  58         struct nfs_fattr *fattr = info->fattr;
  59         struct nfs2_fsstat fsinfo;
  60         struct rpc_message msg = {
  61                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
  62                 .rpc_argp       = fhandle,
  63                 .rpc_resp       = fattr,
  64         };
  65         int status;
  66
  67         dprintk("%s: call getattr\n", __FUNCTION__);
  68         nfs_fattr_init(fattr);
  69         status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
  70         dprintk("%s: reply getattr: %d\n", __FUNCTION__, status);
  71         if (status)
  72                 return status;
  73         dprintk("%s: call statfs\n", __FUNCTION__);
  74         msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
  75         msg.rpc_resp = &fsinfo;
  76         status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
  77         dprintk("%s: reply statfs: %d\n", __FUNCTION__, status);
  78         if (status)
  79                 return status;
  80         info->rtmax  = NFS_MAXDATA;
  81         info->rtpref = fsinfo.tsize;
  82         info->rtmult = fsinfo.bsize;
  83         info->wtmax  = NFS_MAXDATA;
  84         info->wtpref = fsinfo.tsize;
  85         info->wtmult = fsinfo.bsize;
  86         info->dtpref = fsinfo.tsize;
  87         info->maxfilesize = 0x7FFFFFFF;
  88         info->lease_time = 0;
  89         return 0;
  90 }
  91
  92 /*
  93  * One function for each procedure in the NFS protocol.
  94  */
  95 static int
  96 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                 struct nfs_fattr *fattr)
  98 {
  99         struct rpc_message msg = {
 100                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
 101                 .rpc_argp       = fhandle,
 102                 .rpc_resp       = fattr,
 103         };
 104         int     status;
 105
 106         dprintk("NFS call  getattr\n");
 107         nfs_fattr_init(fattr);
 108         status = rpc_call_sync(server->client, &msg, 0);
 109         dprintk("NFS reply getattr: %d\n", status);
 110         return status;
 111 }
 112
 113 static int
 114 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 115                  struct iattr *sattr)
 116 {
 117         struct inode *inode = dentry->d_inode;
 118         struct nfs_sattrargs    arg = {
 119                 .fh     = NFS_FH(inode),
 120                 .sattr  = sattr
 121         };
 122         struct rpc_message msg = {
 123                 .rpc_proc       = &nfs_procedures[NFSPROC_SETATTR],
 124                 .rpc_argp       = &arg,
 125                 .rpc_resp       = fattr,
 126         };
 127         int     status;
 128
 129         /* Mask out the non-modebit related stuff from attr->ia_mode */
 130         sattr->ia_mode &= S_IALLUGO;
 131
 132         dprintk("NFS call  setattr\n");
 133         nfs_fattr_init(fattr);
 134         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 135         if (status == 0)
 136                 nfs_setattr_update_inode(inode, sattr);
 137         dprintk("NFS reply setattr: %d\n", status);
 138         return status;
 139 }
 140
 141 static int
 142 nfs_proc_lookup(struct inode *dir, struct qstr *name,
 143                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 144 {
 145         struct nfs_diropargs    arg = {
 146                 .fh             = NFS_FH(dir),
 147                 .name           = name->name,
 148                 .len            = name->len
 149         };
 150         struct nfs_diropok      res = {
 151                 .fh             = fhandle,
 152                 .fattr          = fattr
 153         };
 154         struct rpc_message msg = {
 155                 .rpc_proc       = &nfs_procedures[NFSPROC_LOOKUP],
 156                 .rpc_argp       = &arg,
 157                 .rpc_resp       = &res,
 158         };
 159         int                     status;
 160
 161         dprintk("NFS call  lookup %s\n", name->name);
 162         nfs_fattr_init(fattr);
 163         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 164         dprintk("NFS reply lookup: %d\n", status);
 165         return status;
 166 }
 167
 168 static int nfs_proc_readlink(struct inode *inode, struct page *page,
 169                 unsigned int pgbase, unsigned int pglen)
 170 {
 171         struct nfs_readlinkargs args = {
 172                 .fh             = NFS_FH(inode),
 173                 .pgbase         = pgbase,
 174                 .pglen          = pglen,
 175                 .pages          = &page
 176         };
 177         struct rpc_message msg = {
 178                 .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 179                 .rpc_argp       = &args,
 180         };
 181         int                     status;
 182
 183         dprintk("NFS call  readlink\n");
 184         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 185         dprintk("NFS reply readlink: %d\n", status);
 186         return status;
 187 }
 188
 189 static int nfs_proc_read(struct nfs_read_data *rdata)
 190 {
 191         int                     flags = rdata->flags;
 192         struct inode *          inode = rdata->inode;
 193         struct nfs_fattr *      fattr = rdata->res.fattr;
 194         struct rpc_message      msg = {
 195                 .rpc_proc       = &nfs_procedures[NFSPROC_READ],
 196                 .rpc_argp       = &rdata->args,
 197                 .rpc_resp       = &rdata->res,
 198                 .rpc_cred       = rdata->cred,
 199         };
 200         int                     status;
 201
 202         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
 203                         (long long) rdata->args.offset);
 204         nfs_fattr_init(fattr);
 205         status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
 206         if (status >= 0) {
 207                 nfs_refresh_inode(inode, fattr);
 208                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 209                  * as it is guaranteed to always return the file attributes
 210                  */
 211                 if (rdata->args.offset + rdata->args.count >= fattr->size)
 212                         rdata->res.eof = 1;
 213         }
 214         dprintk("NFS reply read: %d\n", status);
 215         return status;
 216 }
 217
 218 static int nfs_proc_write(struct nfs_write_data *wdata)
 219 {
 220         int                     flags = wdata->flags;
 221         struct inode *          inode = wdata->inode;
 222         struct nfs_fattr *      fattr = wdata->res.fattr;
 223         struct rpc_message      msg = {
 224                 .rpc_proc       = &nfs_procedures[NFSPROC_WRITE],
 225                 .rpc_argp       = &wdata->args,
 226                 .rpc_resp       = &wdata->res,
 227                 .rpc_cred       = wdata->cred,
 228         };
 229         int                     status;
 230
 231         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
 232                         (long long) wdata->args.offset);
 233         nfs_fattr_init(fattr);
 234         status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
 235         if (status >= 0) {
 236                 nfs_post_op_update_inode(inode, fattr);
 237                 wdata->res.count = wdata->args.count;
 238                 wdata->verf.committed = NFS_FILE_SYNC;
 239         }
 240         dprintk("NFS reply write: %d\n", status);
 241         return status < 0? status : wdata->res.count;
 242 }
 243
 244 static int
 245 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 246                 int flags, struct nameidata *nd)
 247 {
 248         struct nfs_fh           fhandle;
 249         struct nfs_fattr        fattr;
 250         struct nfs_createargs   arg = {
 251                 .fh             = NFS_FH(dir),
 252                 .name           = dentry->d_name.name,
 253                 .len            = dentry->d_name.len,
 254                 .sattr          = sattr
 255         };
 256         struct nfs_diropok      res = {
 257                 .fh             = &fhandle,
 258                 .fattr          = &fattr
 259         };
 260         struct rpc_message msg = {
 261                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 262                 .rpc_argp       = &arg,
 263                 .rpc_resp       = &res,
 264         };
 265         int                     status;
 266
 267         nfs_fattr_init(&fattr);
 268         dprintk("NFS call  create %s\n", dentry->d_name.name);
 269         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 270         if (status == 0)
 271                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 272         dprintk("NFS reply create: %d\n", status);
 273         return status;
 274 }
 275
 276 /*
 277  * In NFSv2, mknod is grafted onto the create call.
 278  */
 279 static int
 280 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 281                dev_t rdev)
 282 {
 283         struct nfs_fh fhandle;
 284         struct nfs_fattr fattr;
 285         struct nfs_createargs   arg = {
 286                 .fh             = NFS_FH(dir),
 287                 .name           = dentry->d_name.name,
 288                 .len            = dentry->d_name.len,
 289                 .sattr          = sattr
 290         };
 291         struct nfs_diropok      res = {
 292                 .fh             = &fhandle,
 293                 .fattr          = &fattr
 294         };
 295         struct rpc_message msg = {
 296                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 297                 .rpc_argp       = &arg,
 298                 .rpc_resp       = &res,
 299         };
 300         int status, mode;
 301
 302         dprintk("NFS call  mknod %s\n", dentry->d_name.name);
 303
 304         mode = sattr->ia_mode;
 305         if (S_ISFIFO(mode)) {
 306                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 307                 sattr->ia_valid &= ~ATTR_SIZE;
 308         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 309                 sattr->ia_valid |= ATTR_SIZE;
 310                 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 311         }
 312
 313         nfs_fattr_init(&fattr);
 314         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 315         nfs_mark_for_revalidate(dir);
 316
 317         if (status == -EINVAL && S_ISFIFO(mode)) {
 318                 sattr->ia_mode = mode;
 319                 nfs_fattr_init(&fattr);
 320                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 321         }
 322         if (status == 0)
 323                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 324         dprintk("NFS reply mknod: %d\n", status);
 325         return status;
 326 }
 327
 328 static int
 329 nfs_proc_remove(struct inode *dir, struct qstr *name)
 330 {
 331         struct nfs_diropargs    arg = {
 332                 .fh             = NFS_FH(dir),
 333                 .name           = name->name,
 334                 .len            = name->len
 335         };
 336         struct rpc_message      msg = {
 337                 .rpc_proc       = &nfs_procedures[NFSPROC_REMOVE],
 338                 .rpc_argp       = &arg,
 339         };
 340         int                     status;
 341
 342         dprintk("NFS call  remove %s\n", name->name);
 343         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 344         nfs_mark_for_revalidate(dir);
 345
 346         dprintk("NFS reply remove: %d\n", status);
 347         return status;
 348 }
 349
 350 static int
 351 nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
 352 {
 353         struct nfs_diropargs    *arg;
 354
 355         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
 356         if (!arg)
 357                 return -ENOMEM;
 358         arg->fh = NFS_FH(dir->d_inode);
 359         arg->name = name->name;
 360         arg->len = name->len;
 361         msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 362         msg->rpc_argp = arg;
 363         return 0;
 364 }
 365
 366 static int
 367 nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
 368 {
 369         struct rpc_message *msg = &task->tk_msg;
 370
 371         if (msg->rpc_argp) {
 372                 nfs_mark_for_revalidate(dir->d_inode);
 373                 kfree(msg->rpc_argp);
 374         }
 375         return 0;
 376 }
 377
 378 static int
 379 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 380                 struct inode *new_dir, struct qstr *new_name)
 381 {
 382         struct nfs_renameargs   arg = {
 383                 .fromfh         = NFS_FH(old_dir),
 384                 .fromname       = old_name->name,
 385                 .fromlen        = old_name->len,
 386                 .tofh           = NFS_FH(new_dir),
 387                 .toname         = new_name->name,
 388                 .tolen          = new_name->len
 389         };
 390         struct rpc_message msg = {
 391                 .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 392                 .rpc_argp       = &arg,
 393         };
 394         int                     status;
 395
 396         dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 397         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 398         nfs_mark_for_revalidate(old_dir);
 399         nfs_mark_for_revalidate(new_dir);
 400         dprintk("NFS reply rename: %d\n", status);
 401         return status;
 402 }
 403
 404 static int
 405 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 406 {
 407         struct nfs_linkargs     arg = {
 408                 .fromfh         = NFS_FH(inode),
 409                 .tofh           = NFS_FH(dir),
 410                 .toname         = name->name,
 411                 .tolen          = name->len
 412         };
 413         struct rpc_message msg = {
 414                 .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 415                 .rpc_argp       = &arg,
 416         };
 417         int                     status;
 418
 419         dprintk("NFS call  link %s\n", name->name);
 420         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 421         nfs_mark_for_revalidate(inode);
 422         nfs_mark_for_revalidate(dir);
 423         dprintk("NFS reply link: %d\n", status);
 424         return status;
 425 }
 426
 427 static int
 428 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 429                  unsigned int len, struct iattr *sattr)
 430 {
 431         struct nfs_fh fhandle;
 432         struct nfs_fattr fattr;
 433         struct nfs_symlinkargs  arg = {
 434                 .fromfh         = NFS_FH(dir),
 435                 .fromname       = dentry->d_name.name,
 436                 .fromlen        = dentry->d_name.len,
 437                 .pages          = &page,
 438                 .pathlen        = 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 (len > NFS2_MAXPATHLEN)
 448                 return -ENAMETOOLONG;
 449
 450         dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 451
 452         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 453         nfs_mark_for_revalidate(dir);
 454
 455         /*
 456          * V2 SYMLINK requests don't return any attributes.  Setting the
 457          * filehandle size to zero indicates to nfs_instantiate that it
 458          * should fill in the data with a LOOKUP call on the wire.
 459          */
 460         if (status == 0) {
 461                 nfs_fattr_init(&fattr);
 462                 fhandle.size = 0;
 463                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 464         }
 465
 466         dprintk("NFS reply symlink: %d\n", status);
 467         return status;
 468 }
 469
 470 static int
 471 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 472 {
 473         struct nfs_fh fhandle;
 474         struct nfs_fattr fattr;
 475         struct nfs_createargs   arg = {
 476                 .fh             = NFS_FH(dir),
 477                 .name           = dentry->d_name.name,
 478                 .len            = dentry->d_name.len,
 479                 .sattr          = sattr
 480         };
 481         struct nfs_diropok      res = {
 482                 .fh             = &fhandle,
 483                 .fattr          = &fattr
 484         };
 485         struct rpc_message msg = {
 486                 .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 487                 .rpc_argp       = &arg,
 488                 .rpc_resp       = &res,
 489         };
 490         int                     status;
 491
 492         dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 493         nfs_fattr_init(&fattr);
 494         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 495         nfs_mark_for_revalidate(dir);
 496         if (status == 0)
 497                 status = nfs_instantiate(dentry, &fhandle, &fattr);
 498         dprintk("NFS reply mkdir: %d\n", status);
 499         return status;
 500 }
 501
 502 static int
 503 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 504 {
 505         struct nfs_diropargs    arg = {
 506                 .fh             = NFS_FH(dir),
 507                 .name           = name->name,
 508                 .len            = name->len
 509         };
 510         struct rpc_message msg = {
 511                 .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 512                 .rpc_argp       = &arg,
 513         };
 514         int                     status;
 515
 516         dprintk("NFS call  rmdir %s\n", name->name);
 517         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 518         nfs_mark_for_revalidate(dir);
 519         dprintk("NFS reply rmdir: %d\n", status);
 520         return status;
 521 }
 522
 523 /*
 524  * The READDIR implementation is somewhat hackish - we pass a temporary
 525  * buffer to the encode function, which installs it in the receive
 526  * the receive iovec. The decode function just parses the reply to make
 527  * sure it is syntactically correct; the entries itself are decoded
 528  * from nfs_readdir by calling the decode_entry function directly.
 529  */
 530 static int
 531 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 532                  u64 cookie, struct page *page, unsigned int count, int plus)
 533 {
 534         struct inode            *dir = dentry->d_inode;
 535         struct nfs_readdirargs  arg = {
 536                 .fh             = NFS_FH(dir),
 537                 .cookie         = cookie,
 538                 .count          = count,
 539                 .pages          = &page,
 540         };
 541         struct rpc_message      msg = {
 542                 .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 543                 .rpc_argp       = &arg,
 544                 .rpc_cred       = cred,
 545         };
 546         int                     status;
 547
 548         lock_kernel();
 549
 550         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 551         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 552
 553         dprintk("NFS reply readdir: %d\n", status);
 554         unlock_kernel();
 555         return status;
 556 }
 557
 558 static int
 559 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 560                         struct nfs_fsstat *stat)
 561 {
 562         struct nfs2_fsstat fsinfo;
 563         struct rpc_message msg = {
 564                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 565                 .rpc_argp       = fhandle,
 566                 .rpc_resp       = &fsinfo,
 567         };
 568         int     status;
 569
 570         dprintk("NFS call  statfs\n");
 571         nfs_fattr_init(stat->fattr);
 572         status = rpc_call_sync(server->client, &msg, 0);
 573         dprintk("NFS reply statfs: %d\n", status);
 574         if (status)
 575                 goto out;
 576         stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 577         stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 578         stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 579         stat->tfiles = 0;
 580         stat->ffiles = 0;
 581         stat->afiles = 0;
 582 out:
 583         return status;
 584 }
 585
 586 static int
 587 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 588                         struct nfs_fsinfo *info)
 589 {
 590         struct nfs2_fsstat fsinfo;
 591         struct rpc_message msg = {
 592                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 593                 .rpc_argp       = fhandle,
 594                 .rpc_resp       = &fsinfo,
 595         };
 596         int     status;
 597
 598         dprintk("NFS call  fsinfo\n");
 599         nfs_fattr_init(info->fattr);
 600         status = rpc_call_sync(server->client, &msg, 0);
 601         dprintk("NFS reply fsinfo: %d\n", status);
 602         if (status)
 603                 goto out;
 604         info->rtmax  = NFS_MAXDATA;
 605         info->rtpref = fsinfo.tsize;
 606         info->rtmult = fsinfo.bsize;
 607         info->wtmax  = NFS_MAXDATA;
 608         info->wtpref = fsinfo.tsize;
 609         info->wtmult = fsinfo.bsize;
 610         info->dtpref = fsinfo.tsize;
 611         info->maxfilesize = 0x7FFFFFFF;
 612         info->lease_time = 0;
 613 out:
 614         return status;
 615 }
 616
 617 static int
 618 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 619                   struct nfs_pathconf *info)
 620 {
 621         info->max_link = 0;
 622         info->max_namelen = NFS2_MAXNAMLEN;
 623         return 0;
 624 }
 625
 626 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 627 {
 628         if (task->tk_status >= 0) {
 629                 nfs_refresh_inode(data->inode, data->res.fattr);
 630                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 631                  * as it is guaranteed to always return the file attributes
 632                  */
 633                 if (data->args.offset + data->args.count >= data->res.fattr->size)
 634                         data->res.eof = 1;
 635         }
 636         return 0;
 637 }
 638
 639 static void nfs_proc_read_setup(struct nfs_read_data *data)
 640 {
 641         struct rpc_message      msg = {
 642                 .rpc_proc       = &nfs_procedures[NFSPROC_READ],
 643                 .rpc_argp       = &data->args,
 644                 .rpc_resp       = &data->res,
 645                 .rpc_cred       = data->cred,
 646         };
 647
 648         rpc_call_setup(&data->task, &msg, 0);
 649 }
 650
 651 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 652 {
 653         if (task->tk_status >= 0)
 654                 nfs_post_op_update_inode(data->inode, data->res.fattr);
 655         return 0;
 656 }
 657
 658 static void nfs_proc_write_setup(struct nfs_write_data *data, int how)
 659 {
 660         struct rpc_message      msg = {
 661                 .rpc_proc       = &nfs_procedures[NFSPROC_WRITE],
 662                 .rpc_argp       = &data->args,
 663                 .rpc_resp       = &data->res,
 664                 .rpc_cred       = data->cred,
 665         };
 666
 667         /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 668         data->args.stable = NFS_FILE_SYNC;
 669
 670         /* Finalize the task. */
 671         rpc_call_setup(&data->task, &msg, 0);
 672 }
 673
 674 static void
 675 nfs_proc_commit_setup(struct nfs_write_data *data, int how)
 676 {
 677         BUG();
 678 }
 679
 680 static int
 681 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 682 {
 683         return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl);
 684 }
 685
 686
 687 const struct nfs_rpc_ops nfs_v2_clientops = {
 688         .version        = 2,                   /* protocol version */
 689         .dentry_ops     = &nfs_dentry_operations,
 690         .dir_inode_ops  = &nfs_dir_inode_operations,
 691         .file_inode_ops = &nfs_file_inode_operations,
 692         .getroot        = nfs_proc_get_root,
 693         .getattr        = nfs_proc_getattr,
 694         .setattr        = nfs_proc_setattr,
 695         .lookup         = nfs_proc_lookup,
 696         .access         = NULL,                /* access */
 697         .readlink       = nfs_proc_readlink,
 698         .read           = nfs_proc_read,
 699         .write          = nfs_proc_write,
 700         .commit         = NULL,                /* commit */
 701         .create         = nfs_proc_create,
 702         .remove         = nfs_proc_remove,
 703         .unlink_setup   = nfs_proc_unlink_setup,
 704         .unlink_done    = nfs_proc_unlink_done,
 705         .rename         = nfs_proc_rename,
 706         .link           = nfs_proc_link,
 707         .symlink        = nfs_proc_symlink,
 708         .mkdir          = nfs_proc_mkdir,
 709         .rmdir          = nfs_proc_rmdir,
 710         .readdir        = nfs_proc_readdir,
 711         .mknod          = nfs_proc_mknod,
 712         .statfs         = nfs_proc_statfs,
 713         .fsinfo         = nfs_proc_fsinfo,
 714         .pathconf       = nfs_proc_pathconf,
 715         .decode_dirent  = nfs_decode_dirent,
 716         .read_setup     = nfs_proc_read_setup,
 717         .read_done      = nfs_read_done,
 718         .write_setup    = nfs_proc_write_setup,
 719         .write_done     = nfs_write_done,
 720         .commit_setup   = nfs_proc_commit_setup,
 721         .file_open      = nfs_open,
 722         .file_release   = nfs_release,
 723         .lock           = nfs_proc_lock,
 724 };