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