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 <linux/freezer.h>
  45 #include "internal.h"
  46
  47 #define NFSDBG_FACILITY         NFSDBG_PROC
  48
  49 /*
  50  * wrapper to handle the -EKEYEXPIRED error message. This should generally
  51  * only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
  52  * support the NFSERR_JUKEBOX error code, but we handle this situation in the
  53  * same way that we handle that error with NFSv3.
  54  */
  55 static int
  56 nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
  57 {
  58         int res;
  59         do {
  60                 res = rpc_call_sync(clnt, msg, flags);
  61                 if (res != -EKEYEXPIRED)
  62                         break;
  63                 freezable_schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
  64                 res = -ERESTARTSYS;
  65         } while (!fatal_signal_pending(current));
  66         return res;
  67 }
  68
  69 #define rpc_call_sync(clnt, msg, flags) nfs_rpc_wrapper(clnt, msg, flags)
  70
  71 static int
  72 nfs_async_handle_expired_key(struct rpc_task *task)
  73 {
  74         if (task->tk_status != -EKEYEXPIRED)
  75                 return 0;
  76         task->tk_status = 0;
  77         rpc_restart_call(task);
  78         rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
  79         return 1;
  80 }
  81
  82 /*
  83  * Bare-bones access to getattr: this is for nfs_read_super.
  84  */
  85 static int
  86 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  87                   struct nfs_fsinfo *info)
  88 {
  89         struct nfs_fattr *fattr = info->fattr;
  90         struct nfs2_fsstat fsinfo;
  91         struct rpc_message msg = {
  92                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
  93                 .rpc_argp       = fhandle,
  94                 .rpc_resp       = fattr,
  95         };
  96         int status;
  97
  98         dprintk("%s: call getattr\n", __func__);
  99         nfs_fattr_init(fattr);
 100         status = rpc_call_sync(server->client, &msg, 0);
 101         /* Retry with default authentication if different */
 102         if (status && server->nfs_client->cl_rpcclient != server->client)
 103                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
 104         dprintk("%s: reply getattr: %d\n", __func__, status);
 105         if (status)
 106                 return status;
 107         dprintk("%s: call statfs\n", __func__);
 108         msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
 109         msg.rpc_resp = &fsinfo;
 110         status = rpc_call_sync(server->client, &msg, 0);
 111         /* Retry with default authentication if different */
 112         if (status && server->nfs_client->cl_rpcclient != server->client)
 113                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
 114         dprintk("%s: reply statfs: %d\n", __func__, status);
 115         if (status)
 116                 return status;
 117         info->rtmax  = NFS_MAXDATA;
 118         info->rtpref = fsinfo.tsize;
 119         info->rtmult = fsinfo.bsize;
 120         info->wtmax  = NFS_MAXDATA;
 121         info->wtpref = fsinfo.tsize;
 122         info->wtmult = fsinfo.bsize;
 123         info->dtpref = fsinfo.tsize;
 124         info->maxfilesize = 0x7FFFFFFF;
 125         info->lease_time = 0;
 126         return 0;
 127 }
 128
 129 /*
 130  * One function for each procedure in the NFS protocol.
 131  */
 132 static int
 133 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 134                 struct nfs_fattr *fattr)
 135 {
 136         struct rpc_message msg = {
 137                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
 138                 .rpc_argp       = fhandle,
 139                 .rpc_resp       = fattr,
 140         };
 141         int     status;
 142
 143         dprintk("NFS call  getattr\n");
 144         nfs_fattr_init(fattr);
 145         status = rpc_call_sync(server->client, &msg, 0);
 146         dprintk("NFS reply getattr: %d\n", status);
 147         return status;
 148 }
 149
 150 static int
 151 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 152                  struct iattr *sattr)
 153 {
 154         struct inode *inode = dentry->d_inode;
 155         struct nfs_sattrargs    arg = {
 156                 .fh     = NFS_FH(inode),
 157                 .sattr  = sattr
 158         };
 159         struct rpc_message msg = {
 160                 .rpc_proc       = &nfs_procedures[NFSPROC_SETATTR],
 161                 .rpc_argp       = &arg,
 162                 .rpc_resp       = fattr,
 163         };
 164         int     status;
 165
 166         /* Mask out the non-modebit related stuff from attr->ia_mode */
 167         sattr->ia_mode &= S_IALLUGO;
 168
 169         dprintk("NFS call  setattr\n");
 170         if (sattr->ia_valid & ATTR_FILE)
 171                 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 172         nfs_fattr_init(fattr);
 173         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 174         if (status == 0)
 175                 nfs_setattr_update_inode(inode, sattr);
 176         dprintk("NFS reply setattr: %d\n", status);
 177         return status;
 178 }
 179
 180 static int
 181 nfs_proc_lookup(struct inode *dir, struct qstr *name,
 182                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 183 {
 184         struct nfs_diropargs    arg = {
 185                 .fh             = NFS_FH(dir),
 186                 .name           = name->name,
 187                 .len            = name->len
 188         };
 189         struct nfs_diropok      res = {
 190                 .fh             = fhandle,
 191                 .fattr          = fattr
 192         };
 193         struct rpc_message msg = {
 194                 .rpc_proc       = &nfs_procedures[NFSPROC_LOOKUP],
 195                 .rpc_argp       = &arg,
 196                 .rpc_resp       = &res,
 197         };
 198         int                     status;
 199
 200         dprintk("NFS call  lookup %s\n", name->name);
 201         nfs_fattr_init(fattr);
 202         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 203         dprintk("NFS reply lookup: %d\n", status);
 204         return status;
 205 }
 206
 207 static int nfs_proc_readlink(struct inode *inode, struct page *page,
 208                 unsigned int pgbase, unsigned int pglen)
 209 {
 210         struct nfs_readlinkargs args = {
 211                 .fh             = NFS_FH(inode),
 212                 .pgbase         = pgbase,
 213                 .pglen          = pglen,
 214                 .pages          = &page
 215         };
 216         struct rpc_message msg = {
 217                 .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 218                 .rpc_argp       = &args,
 219         };
 220         int                     status;
 221
 222         dprintk("NFS call  readlink\n");
 223         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 224         dprintk("NFS reply readlink: %d\n", status);
 225         return status;
 226 }
 227
 228 struct nfs_createdata {
 229         struct nfs_createargs arg;
 230         struct nfs_diropok res;
 231         struct nfs_fh fhandle;
 232         struct nfs_fattr fattr;
 233 };
 234
 235 static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
 236                 struct dentry *dentry, struct iattr *sattr)
 237 {
 238         struct nfs_createdata *data;
 239
 240         data = kmalloc(sizeof(*data), GFP_KERNEL);
 241
 242         if (data != NULL) {
 243                 data->arg.fh = NFS_FH(dir);
 244                 data->arg.name = dentry->d_name.name;
 245                 data->arg.len = dentry->d_name.len;
 246                 data->arg.sattr = sattr;
 247                 nfs_fattr_init(&data->fattr);
 248                 data->fhandle.size = 0;
 249                 data->res.fh = &data->fhandle;
 250                 data->res.fattr = &data->fattr;
 251         }
 252         return data;
 253 };
 254
 255 static void nfs_free_createdata(const struct nfs_createdata *data)
 256 {
 257         kfree(data);
 258 }
 259
 260 static int
 261 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 262                 int flags, struct nfs_open_context *ctx)
 263 {
 264         struct nfs_createdata *data;
 265         struct rpc_message msg = {
 266                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 267         };
 268         int status = -ENOMEM;
 269
 270         dprintk("NFS call  create %s\n", dentry->d_name.name);
 271         data = nfs_alloc_createdata(dir, dentry, sattr);
 272         if (data == NULL)
 273                 goto out;
 274         msg.rpc_argp = &data->arg;
 275         msg.rpc_resp = &data->res;
 276         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 277         nfs_mark_for_revalidate(dir);
 278         if (status == 0)
 279                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 280         nfs_free_createdata(data);
 281 out:
 282         dprintk("NFS reply create: %d\n", status);
 283         return status;
 284 }
 285
 286 /*
 287  * In NFSv2, mknod is grafted onto the create call.
 288  */
 289 static int
 290 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 291                dev_t rdev)
 292 {
 293         struct nfs_createdata *data;
 294         struct rpc_message msg = {
 295                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 296         };
 297         umode_t mode;
 298         int status = -ENOMEM;
 299
 300         dprintk("NFS call  mknod %s\n", dentry->d_name.name);
 301
 302         mode = sattr->ia_mode;
 303         if (S_ISFIFO(mode)) {
 304                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 305                 sattr->ia_valid &= ~ATTR_SIZE;
 306         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 307                 sattr->ia_valid |= ATTR_SIZE;
 308                 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 309         }
 310
 311         data = nfs_alloc_createdata(dir, dentry, sattr);
 312         if (data == NULL)
 313                 goto out;
 314         msg.rpc_argp = &data->arg;
 315         msg.rpc_resp = &data->res;
 316
 317         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 318         nfs_mark_for_revalidate(dir);
 319
 320         if (status == -EINVAL && S_ISFIFO(mode)) {
 321                 sattr->ia_mode = mode;
 322                 nfs_fattr_init(data->res.fattr);
 323                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 324         }
 325         if (status == 0)
 326                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 327         nfs_free_createdata(data);
 328 out:
 329         dprintk("NFS reply mknod: %d\n", status);
 330         return status;
 331 }
 332
 333 static int
 334 nfs_proc_remove(struct inode *dir, struct qstr *name)
 335 {
 336         struct nfs_removeargs arg = {
 337                 .fh = NFS_FH(dir),
 338                 .name = *name,
 339         };
 340         struct rpc_message msg = {
 341                 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
 342                 .rpc_argp = &arg,
 343         };
 344         int                     status;
 345
 346         dprintk("NFS call  remove %s\n", name->name);
 347         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 348         nfs_mark_for_revalidate(dir);
 349
 350         dprintk("NFS reply remove: %d\n", status);
 351         return status;
 352 }
 353
 354 static void
 355 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 356 {
 357         msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 358 }
 359
 360 static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 361 {
 362         rpc_call_start(task);
 363 }
 364
 365 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 366 {
 367         if (nfs_async_handle_expired_key(task))
 368                 return 0;
 369         nfs_mark_for_revalidate(dir);
 370         return 1;
 371 }
 372
 373 static void
 374 nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
 375 {
 376         msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
 377 }
 378
 379 static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 380 {
 381         rpc_call_start(task);
 382 }
 383
 384 static int
 385 nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 386                      struct inode *new_dir)
 387 {
 388         if (nfs_async_handle_expired_key(task))
 389                 return 0;
 390         nfs_mark_for_revalidate(old_dir);
 391         nfs_mark_for_revalidate(new_dir);
 392         return 1;
 393 }
 394
 395 static int
 396 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 397                 struct inode *new_dir, struct qstr *new_name)
 398 {
 399         struct nfs_renameargs   arg = {
 400                 .old_dir        = NFS_FH(old_dir),
 401                 .old_name       = old_name,
 402                 .new_dir        = NFS_FH(new_dir),
 403                 .new_name       = new_name,
 404         };
 405         struct rpc_message msg = {
 406                 .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 407                 .rpc_argp       = &arg,
 408         };
 409         int                     status;
 410
 411         dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 412         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 413         nfs_mark_for_revalidate(old_dir);
 414         nfs_mark_for_revalidate(new_dir);
 415         dprintk("NFS reply rename: %d\n", status);
 416         return status;
 417 }
 418
 419 static int
 420 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 421 {
 422         struct nfs_linkargs     arg = {
 423                 .fromfh         = NFS_FH(inode),
 424                 .tofh           = NFS_FH(dir),
 425                 .toname         = name->name,
 426                 .tolen          = name->len
 427         };
 428         struct rpc_message msg = {
 429                 .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 430                 .rpc_argp       = &arg,
 431         };
 432         int                     status;
 433
 434         dprintk("NFS call  link %s\n", name->name);
 435         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 436         nfs_mark_for_revalidate(inode);
 437         nfs_mark_for_revalidate(dir);
 438         dprintk("NFS reply link: %d\n", status);
 439         return status;
 440 }
 441
 442 static int
 443 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 444                  unsigned int len, struct iattr *sattr)
 445 {
 446         struct nfs_fh *fh;
 447         struct nfs_fattr *fattr;
 448         struct nfs_symlinkargs  arg = {
 449                 .fromfh         = NFS_FH(dir),
 450                 .fromname       = dentry->d_name.name,
 451                 .fromlen        = dentry->d_name.len,
 452                 .pages          = &page,
 453                 .pathlen        = len,
 454                 .sattr          = sattr
 455         };
 456         struct rpc_message msg = {
 457                 .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 458                 .rpc_argp       = &arg,
 459         };
 460         int status = -ENAMETOOLONG;
 461
 462         dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 463
 464         if (len > NFS2_MAXPATHLEN)
 465                 goto out;
 466
 467         fh = nfs_alloc_fhandle();
 468         fattr = nfs_alloc_fattr();
 469         status = -ENOMEM;
 470         if (fh == NULL || fattr == NULL)
 471                 goto out_free;
 472
 473         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 474         nfs_mark_for_revalidate(dir);
 475
 476         /*
 477          * V2 SYMLINK requests don't return any attributes.  Setting the
 478          * filehandle size to zero indicates to nfs_instantiate that it
 479          * should fill in the data with a LOOKUP call on the wire.
 480          */
 481         if (status == 0)
 482                 status = nfs_instantiate(dentry, fh, fattr);
 483
 484 out_free:
 485         nfs_free_fattr(fattr);
 486         nfs_free_fhandle(fh);
 487 out:
 488         dprintk("NFS reply symlink: %d\n", status);
 489         return status;
 490 }
 491
 492 static int
 493 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 494 {
 495         struct nfs_createdata *data;
 496         struct rpc_message msg = {
 497                 .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 498         };
 499         int status = -ENOMEM;
 500
 501         dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 502         data = nfs_alloc_createdata(dir, dentry, sattr);
 503         if (data == NULL)
 504                 goto out;
 505         msg.rpc_argp = &data->arg;
 506         msg.rpc_resp = &data->res;
 507
 508         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 509         nfs_mark_for_revalidate(dir);
 510         if (status == 0)
 511                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 512         nfs_free_createdata(data);
 513 out:
 514         dprintk("NFS reply mkdir: %d\n", status);
 515         return status;
 516 }
 517
 518 static int
 519 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 520 {
 521         struct nfs_diropargs    arg = {
 522                 .fh             = NFS_FH(dir),
 523                 .name           = name->name,
 524                 .len            = name->len
 525         };
 526         struct rpc_message msg = {
 527                 .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 528                 .rpc_argp       = &arg,
 529         };
 530         int                     status;
 531
 532         dprintk("NFS call  rmdir %s\n", name->name);
 533         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 534         nfs_mark_for_revalidate(dir);
 535         dprintk("NFS reply rmdir: %d\n", status);
 536         return status;
 537 }
 538
 539 /*
 540  * The READDIR implementation is somewhat hackish - we pass a temporary
 541  * buffer to the encode function, which installs it in the receive
 542  * the receive iovec. The decode function just parses the reply to make
 543  * sure it is syntactically correct; the entries itself are decoded
 544  * from nfs_readdir by calling the decode_entry function directly.
 545  */
 546 static int
 547 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 548                  u64 cookie, struct page **pages, unsigned int count, int plus)
 549 {
 550         struct inode            *dir = dentry->d_inode;
 551         struct nfs_readdirargs  arg = {
 552                 .fh             = NFS_FH(dir),
 553                 .cookie         = cookie,
 554                 .count          = count,
 555                 .pages          = pages,
 556         };
 557         struct rpc_message      msg = {
 558                 .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 559                 .rpc_argp       = &arg,
 560                 .rpc_cred       = cred,
 561         };
 562         int                     status;
 563
 564         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 565         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 566
 567         nfs_invalidate_atime(dir);
 568
 569         dprintk("NFS reply readdir: %d\n", status);
 570         return status;
 571 }
 572
 573 static int
 574 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 575                         struct nfs_fsstat *stat)
 576 {
 577         struct nfs2_fsstat fsinfo;
 578         struct rpc_message msg = {
 579                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 580                 .rpc_argp       = fhandle,
 581                 .rpc_resp       = &fsinfo,
 582         };
 583         int     status;
 584
 585         dprintk("NFS call  statfs\n");
 586         nfs_fattr_init(stat->fattr);
 587         status = rpc_call_sync(server->client, &msg, 0);
 588         dprintk("NFS reply statfs: %d\n", status);
 589         if (status)
 590                 goto out;
 591         stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 592         stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 593         stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 594         stat->tfiles = 0;
 595         stat->ffiles = 0;
 596         stat->afiles = 0;
 597 out:
 598         return status;
 599 }
 600
 601 static int
 602 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 603                         struct nfs_fsinfo *info)
 604 {
 605         struct nfs2_fsstat fsinfo;
 606         struct rpc_message msg = {
 607                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 608                 .rpc_argp       = fhandle,
 609                 .rpc_resp       = &fsinfo,
 610         };
 611         int     status;
 612
 613         dprintk("NFS call  fsinfo\n");
 614         nfs_fattr_init(info->fattr);
 615         status = rpc_call_sync(server->client, &msg, 0);
 616         dprintk("NFS reply fsinfo: %d\n", status);
 617         if (status)
 618                 goto out;
 619         info->rtmax  = NFS_MAXDATA;
 620         info->rtpref = fsinfo.tsize;
 621         info->rtmult = fsinfo.bsize;
 622         info->wtmax  = NFS_MAXDATA;
 623         info->wtpref = fsinfo.tsize;
 624         info->wtmult = fsinfo.bsize;
 625         info->dtpref = fsinfo.tsize;
 626         info->maxfilesize = 0x7FFFFFFF;
 627         info->lease_time = 0;
 628 out:
 629         return status;
 630 }
 631
 632 static int
 633 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 634                   struct nfs_pathconf *info)
 635 {
 636         info->max_link = 0;
 637         info->max_namelen = NFS2_MAXNAMLEN;
 638         return 0;
 639 }
 640
 641 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 642 {
 643         struct inode *inode = data->header->inode;
 644
 645         if (nfs_async_handle_expired_key(task))
 646                 return -EAGAIN;
 647
 648         nfs_invalidate_atime(inode);
 649         if (task->tk_status >= 0) {
 650                 nfs_refresh_inode(inode, data->res.fattr);
 651                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 652                  * as it is guaranteed to always return the file attributes
 653                  */
 654                 if (data->args.offset + data->args.count >= data->res.fattr->size)
 655                         data->res.eof = 1;
 656         }
 657         return 0;
 658 }
 659
 660 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 661 {
 662         msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 663 }
 664
 665 static void nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
 666 {
 667         rpc_call_start(task);
 668 }
 669
 670 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 671 {
 672         struct inode *inode = data->header->inode;
 673
 674         if (nfs_async_handle_expired_key(task))
 675                 return -EAGAIN;
 676
 677         if (task->tk_status >= 0)
 678                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
 679         return 0;
 680 }
 681
 682 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 683 {
 684         /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 685         data->args.stable = NFS_FILE_SYNC;
 686         msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 687 }
 688
 689 static void nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
 690 {
 691         rpc_call_start(task);
 692 }
 693
 694 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 695 {
 696         BUG();
 697 }
 698
 699 static void
 700 nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
 701 {
 702         BUG();
 703 }
 704
 705 static int
 706 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 707 {
 708         struct inode *inode = filp->f_path.dentry->d_inode;
 709
 710         return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 711 }
 712
 713 /* Helper functions for NFS lock bounds checking */
 714 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 715 static int nfs_lock_check_bounds(const struct file_lock *fl)
 716 {
 717         __s32 start, end;
 718
 719         start = (__s32)fl->fl_start;
 720         if ((loff_t)start != fl->fl_start)
 721                 goto out_einval;
 722
 723         if (fl->fl_end != OFFSET_MAX) {
 724                 end = (__s32)fl->fl_end;
 725                 if ((loff_t)end != fl->fl_end)
 726                         goto out_einval;
 727         } else
 728                 end = NFS_LOCK32_OFFSET_MAX;
 729
 730         if (start < 0 || start > end)
 731                 goto out_einval;
 732         return 0;
 733 out_einval:
 734         return -EINVAL;
 735 }
 736
 737 const struct nfs_rpc_ops nfs_v2_clientops = {
 738         .version        = 2,                   /* protocol version */
 739         .dentry_ops     = &nfs_dentry_operations,
 740         .dir_inode_ops  = &nfs_dir_inode_operations,
 741         .file_inode_ops = &nfs_file_inode_operations,
 742         .file_ops       = &nfs_file_operations,
 743         .getroot        = nfs_proc_get_root,
 744         .submount       = nfs_submount,
 745         .getattr        = nfs_proc_getattr,
 746         .setattr        = nfs_proc_setattr,
 747         .lookup         = nfs_proc_lookup,
 748         .access         = NULL,                /* access */
 749         .readlink       = nfs_proc_readlink,
 750         .create         = nfs_proc_create,
 751         .remove         = nfs_proc_remove,
 752         .unlink_setup   = nfs_proc_unlink_setup,
 753         .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
 754         .unlink_done    = nfs_proc_unlink_done,
 755         .rename         = nfs_proc_rename,
 756         .rename_setup   = nfs_proc_rename_setup,
 757         .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
 758         .rename_done    = nfs_proc_rename_done,
 759         .link           = nfs_proc_link,
 760         .symlink        = nfs_proc_symlink,
 761         .mkdir          = nfs_proc_mkdir,
 762         .rmdir          = nfs_proc_rmdir,
 763         .readdir        = nfs_proc_readdir,
 764         .mknod          = nfs_proc_mknod,
 765         .statfs         = nfs_proc_statfs,
 766         .fsinfo         = nfs_proc_fsinfo,
 767         .pathconf       = nfs_proc_pathconf,
 768         .decode_dirent  = nfs2_decode_dirent,
 769         .read_setup     = nfs_proc_read_setup,
 770         .read_rpc_prepare = nfs_proc_read_rpc_prepare,
 771         .read_done      = nfs_read_done,
 772         .write_setup    = nfs_proc_write_setup,
 773         .write_rpc_prepare = nfs_proc_write_rpc_prepare,
 774         .write_done     = nfs_write_done,
 775         .commit_setup   = nfs_proc_commit_setup,
 776         .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
 777         .lock           = nfs_proc_lock,
 778         .lock_check_bounds = nfs_lock_check_bounds,
 779         .close_context  = nfs_close_context,
 780         .init_client    = nfs_init_client,
 781 };