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