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 struct nfs_createdata {
 228         struct nfs_createargs arg;
 229         struct nfs_diropok res;
 230         struct nfs_fh fhandle;
 231         struct nfs_fattr fattr;
 232 };
 233
 234 static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
 235                 struct dentry *dentry, struct iattr *sattr)
 236 {
 237         struct nfs_createdata *data;
 238
 239         data = kmalloc(sizeof(*data), GFP_KERNEL);
 240
 241         if (data != NULL) {
 242                 data->arg.fh = NFS_FH(dir);
 243                 data->arg.name = dentry->d_name.name;
 244                 data->arg.len = dentry->d_name.len;
 245                 data->arg.sattr = sattr;
 246                 nfs_fattr_init(&data->fattr);
 247                 data->fhandle.size = 0;
 248                 data->res.fh = &data->fhandle;
 249                 data->res.fattr = &data->fattr;
 250         }
 251         return data;
 252 };
 253
 254 static void nfs_free_createdata(const struct nfs_createdata *data)
 255 {
 256         kfree(data);
 257 }
 258
 259 static int
 260 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 261                 int flags, struct nameidata *nd)
 262 {
 263         struct nfs_createdata *data;
 264         struct rpc_message msg = {
 265                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 266         };
 267         int status = -ENOMEM;
 268
 269         dprintk("NFS call  create %s\n", dentry->d_name.name);
 270         data = nfs_alloc_createdata(dir, dentry, sattr);
 271         if (data == NULL)
 272                 goto out;
 273         msg.rpc_argp = &data->arg;
 274         msg.rpc_resp = &data->res;
 275         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 276         nfs_mark_for_revalidate(dir);
 277         if (status == 0)
 278                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 279         nfs_free_createdata(data);
 280 out:
 281         dprintk("NFS reply create: %d\n", status);
 282         return status;
 283 }
 284
 285 /*
 286  * In NFSv2, mknod is grafted onto the create call.
 287  */
 288 static int
 289 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 290                dev_t rdev)
 291 {
 292         struct nfs_createdata *data;
 293         struct rpc_message msg = {
 294                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 295         };
 296         umode_t mode;
 297         int status = -ENOMEM;
 298
 299         dprintk("NFS call  mknod %s\n", dentry->d_name.name);
 300
 301         mode = sattr->ia_mode;
 302         if (S_ISFIFO(mode)) {
 303                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 304                 sattr->ia_valid &= ~ATTR_SIZE;
 305         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 306                 sattr->ia_valid |= ATTR_SIZE;
 307                 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 308         }
 309
 310         data = nfs_alloc_createdata(dir, dentry, sattr);
 311         if (data == NULL)
 312                 goto out;
 313         msg.rpc_argp = &data->arg;
 314         msg.rpc_resp = &data->res;
 315
 316         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 317         nfs_mark_for_revalidate(dir);
 318
 319         if (status == -EINVAL && S_ISFIFO(mode)) {
 320                 sattr->ia_mode = mode;
 321                 nfs_fattr_init(data->res.fattr);
 322                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 323         }
 324         if (status == 0)
 325                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 326         nfs_free_createdata(data);
 327 out:
 328         dprintk("NFS reply mknod: %d\n", status);
 329         return status;
 330 }
 331
 332 static int
 333 nfs_proc_remove(struct inode *dir, struct qstr *name)
 334 {
 335         struct nfs_removeargs arg = {
 336                 .fh = NFS_FH(dir),
 337                 .name.len = name->len,
 338                 .name.name = 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 int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 361 {
 362         if (nfs_async_handle_expired_key(task))
 363                 return 0;
 364         nfs_mark_for_revalidate(dir);
 365         return 1;
 366 }
 367
 368 static int
 369 nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 370                 struct inode *new_dir, struct qstr *new_name)
 371 {
 372         struct nfs_renameargs   arg = {
 373                 .fromfh         = NFS_FH(old_dir),
 374                 .fromname       = old_name->name,
 375                 .fromlen        = old_name->len,
 376                 .tofh           = NFS_FH(new_dir),
 377                 .toname         = new_name->name,
 378                 .tolen          = new_name->len
 379         };
 380         struct rpc_message msg = {
 381                 .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 382                 .rpc_argp       = &arg,
 383         };
 384         int                     status;
 385
 386         dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 387         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 388         nfs_mark_for_revalidate(old_dir);
 389         nfs_mark_for_revalidate(new_dir);
 390         dprintk("NFS reply rename: %d\n", status);
 391         return status;
 392 }
 393
 394 static int
 395 nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 396 {
 397         struct nfs_linkargs     arg = {
 398                 .fromfh         = NFS_FH(inode),
 399                 .tofh           = NFS_FH(dir),
 400                 .toname         = name->name,
 401                 .tolen          = name->len
 402         };
 403         struct rpc_message msg = {
 404                 .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 405                 .rpc_argp       = &arg,
 406         };
 407         int                     status;
 408
 409         dprintk("NFS call  link %s\n", name->name);
 410         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 411         nfs_mark_for_revalidate(inode);
 412         nfs_mark_for_revalidate(dir);
 413         dprintk("NFS reply link: %d\n", status);
 414         return status;
 415 }
 416
 417 static int
 418 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 419                  unsigned int len, struct iattr *sattr)
 420 {
 421         struct nfs_fh *fh;
 422         struct nfs_fattr *fattr;
 423         struct nfs_symlinkargs  arg = {
 424                 .fromfh         = NFS_FH(dir),
 425                 .fromname       = dentry->d_name.name,
 426                 .fromlen        = dentry->d_name.len,
 427                 .pages          = &page,
 428                 .pathlen        = len,
 429                 .sattr          = sattr
 430         };
 431         struct rpc_message msg = {
 432                 .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 433                 .rpc_argp       = &arg,
 434         };
 435         int status = -ENAMETOOLONG;
 436
 437         dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 438
 439         if (len > NFS2_MAXPATHLEN)
 440                 goto out;
 441
 442         fh = nfs_alloc_fhandle();
 443         fattr = nfs_alloc_fattr();
 444         status = -ENOMEM;
 445         if (fh == NULL || fattr == NULL)
 446                 goto out;
 447
 448         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 449         nfs_mark_for_revalidate(dir);
 450
 451         /*
 452          * V2 SYMLINK requests don't return any attributes.  Setting the
 453          * filehandle size to zero indicates to nfs_instantiate that it
 454          * should fill in the data with a LOOKUP call on the wire.
 455          */
 456         if (status == 0)
 457                 status = nfs_instantiate(dentry, fh, fattr);
 458
 459         nfs_free_fattr(fattr);
 460         nfs_free_fhandle(fh);
 461 out:
 462         dprintk("NFS reply symlink: %d\n", status);
 463         return status;
 464 }
 465
 466 static int
 467 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 468 {
 469         struct nfs_createdata *data;
 470         struct rpc_message msg = {
 471                 .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 472         };
 473         int status = -ENOMEM;
 474
 475         dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 476         data = nfs_alloc_createdata(dir, dentry, sattr);
 477         if (data == NULL)
 478                 goto out;
 479         msg.rpc_argp = &data->arg;
 480         msg.rpc_resp = &data->res;
 481
 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, data->res.fh, data->res.fattr);
 486         nfs_free_createdata(data);
 487 out:
 488         dprintk("NFS reply mkdir: %d\n", status);
 489         return status;
 490 }
 491
 492 static int
 493 nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 494 {
 495         struct nfs_diropargs    arg = {
 496                 .fh             = NFS_FH(dir),
 497                 .name           = name->name,
 498                 .len            = name->len
 499         };
 500         struct rpc_message msg = {
 501                 .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 502                 .rpc_argp       = &arg,
 503         };
 504         int                     status;
 505
 506         dprintk("NFS call  rmdir %s\n", name->name);
 507         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 508         nfs_mark_for_revalidate(dir);
 509         dprintk("NFS reply rmdir: %d\n", status);
 510         return status;
 511 }
 512
 513 /*
 514  * The READDIR implementation is somewhat hackish - we pass a temporary
 515  * buffer to the encode function, which installs it in the receive
 516  * the receive iovec. The decode function just parses the reply to make
 517  * sure it is syntactically correct; the entries itself are decoded
 518  * from nfs_readdir by calling the decode_entry function directly.
 519  */
 520 static int
 521 nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 522                  u64 cookie, struct page *page, unsigned int count, int plus)
 523 {
 524         struct inode            *dir = dentry->d_inode;
 525         struct nfs_readdirargs  arg = {
 526                 .fh             = NFS_FH(dir),
 527                 .cookie         = cookie,
 528                 .count          = count,
 529                 .pages          = &page,
 530         };
 531         struct rpc_message      msg = {
 532                 .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 533                 .rpc_argp       = &arg,
 534                 .rpc_cred       = cred,
 535         };
 536         int                     status;
 537
 538         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 539         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 540
 541         nfs_invalidate_atime(dir);
 542
 543         dprintk("NFS reply readdir: %d\n", status);
 544         return status;
 545 }
 546
 547 static int
 548 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 549                         struct nfs_fsstat *stat)
 550 {
 551         struct nfs2_fsstat fsinfo;
 552         struct rpc_message msg = {
 553                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 554                 .rpc_argp       = fhandle,
 555                 .rpc_resp       = &fsinfo,
 556         };
 557         int     status;
 558
 559         dprintk("NFS call  statfs\n");
 560         nfs_fattr_init(stat->fattr);
 561         status = rpc_call_sync(server->client, &msg, 0);
 562         dprintk("NFS reply statfs: %d\n", status);
 563         if (status)
 564                 goto out;
 565         stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 566         stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 567         stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 568         stat->tfiles = 0;
 569         stat->ffiles = 0;
 570         stat->afiles = 0;
 571 out:
 572         return status;
 573 }
 574
 575 static int
 576 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 577                         struct nfs_fsinfo *info)
 578 {
 579         struct nfs2_fsstat fsinfo;
 580         struct rpc_message msg = {
 581                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 582                 .rpc_argp       = fhandle,
 583                 .rpc_resp       = &fsinfo,
 584         };
 585         int     status;
 586
 587         dprintk("NFS call  fsinfo\n");
 588         nfs_fattr_init(info->fattr);
 589         status = rpc_call_sync(server->client, &msg, 0);
 590         dprintk("NFS reply fsinfo: %d\n", status);
 591         if (status)
 592                 goto out;
 593         info->rtmax  = NFS_MAXDATA;
 594         info->rtpref = fsinfo.tsize;
 595         info->rtmult = fsinfo.bsize;
 596         info->wtmax  = NFS_MAXDATA;
 597         info->wtpref = fsinfo.tsize;
 598         info->wtmult = fsinfo.bsize;
 599         info->dtpref = fsinfo.tsize;
 600         info->maxfilesize = 0x7FFFFFFF;
 601         info->lease_time = 0;
 602 out:
 603         return status;
 604 }
 605
 606 static int
 607 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 608                   struct nfs_pathconf *info)
 609 {
 610         info->max_link = 0;
 611         info->max_namelen = NFS2_MAXNAMLEN;
 612         return 0;
 613 }
 614
 615 static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 616 {
 617         if (nfs_async_handle_expired_key(task))
 618                 return -EAGAIN;
 619
 620         nfs_invalidate_atime(data->inode);
 621         if (task->tk_status >= 0) {
 622                 nfs_refresh_inode(data->inode, data->res.fattr);
 623                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 624                  * as it is guaranteed to always return the file attributes
 625                  */
 626                 if (data->args.offset + data->args.count >= data->res.fattr->size)
 627                         data->res.eof = 1;
 628         }
 629         return 0;
 630 }
 631
 632 static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 633 {
 634         msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 635 }
 636
 637 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 638 {
 639         if (nfs_async_handle_expired_key(task))
 640                 return -EAGAIN;
 641
 642         if (task->tk_status >= 0)
 643                 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
 644         return 0;
 645 }
 646
 647 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 648 {
 649         /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 650         data->args.stable = NFS_FILE_SYNC;
 651         msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 652 }
 653
 654 static void
 655 nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
 656 {
 657         BUG();
 658 }
 659
 660 static int
 661 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 662 {
 663         struct inode *inode = filp->f_path.dentry->d_inode;
 664
 665         return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 666 }
 667
 668 /* Helper functions for NFS lock bounds checking */
 669 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 670 static int nfs_lock_check_bounds(const struct file_lock *fl)
 671 {
 672         __s32 start, end;
 673
 674         start = (__s32)fl->fl_start;
 675         if ((loff_t)start != fl->fl_start)
 676                 goto out_einval;
 677
 678         if (fl->fl_end != OFFSET_MAX) {
 679                 end = (__s32)fl->fl_end;
 680                 if ((loff_t)end != fl->fl_end)
 681                         goto out_einval;
 682         } else
 683                 end = NFS_LOCK32_OFFSET_MAX;
 684
 685         if (start < 0 || start > end)
 686                 goto out_einval;
 687         return 0;
 688 out_einval:
 689         return -EINVAL;
 690 }
 691
 692 const struct nfs_rpc_ops nfs_v2_clientops = {
 693         .version        = 2,                   /* protocol version */
 694         .dentry_ops     = &nfs_dentry_operations,
 695         .dir_inode_ops  = &nfs_dir_inode_operations,
 696         .file_inode_ops = &nfs_file_inode_operations,
 697         .getroot        = nfs_proc_get_root,
 698         .getattr        = nfs_proc_getattr,
 699         .setattr        = nfs_proc_setattr,
 700         .lookup         = nfs_proc_lookup,
 701         .access         = NULL,                /* access */
 702         .readlink       = nfs_proc_readlink,
 703         .create         = nfs_proc_create,
 704         .remove         = nfs_proc_remove,
 705         .unlink_setup   = nfs_proc_unlink_setup,
 706         .unlink_done    = nfs_proc_unlink_done,
 707         .rename         = nfs_proc_rename,
 708         .link           = nfs_proc_link,
 709         .symlink        = nfs_proc_symlink,
 710         .mkdir          = nfs_proc_mkdir,
 711         .rmdir          = nfs_proc_rmdir,
 712         .readdir        = nfs_proc_readdir,
 713         .mknod          = nfs_proc_mknod,
 714         .statfs         = nfs_proc_statfs,
 715         .fsinfo         = nfs_proc_fsinfo,
 716         .pathconf       = nfs_proc_pathconf,
 717         .decode_dirent  = nfs_decode_dirent,
 718         .read_setup     = nfs_proc_read_setup,
 719         .read_done      = nfs_read_done,
 720         .write_setup    = nfs_proc_write_setup,
 721         .write_done     = nfs_write_done,
 722         .commit_setup   = nfs_proc_commit_setup,
 723         .lock           = nfs_proc_lock,
 724         .lock_check_bounds = nfs_lock_check_bounds,
 725         .close_context  = nfs_close_context,
 726 };