fs/nfsd/nfsproc.c

   1 /*
   2  * nfsproc2.c   Process version 2 NFS requests.
   3  * linux/fs/nfsd/nfs2proc.c
   4  *
   5  * Process version 2 NFS requests.
   6  *
   7  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   8  */
   9
  10 #include <linux/linkage.h>
  11 #include <linux/time.h>
  12 #include <linux/errno.h>
  13 #include <linux/fs.h>
  14 #include <linux/stat.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/net.h>
  17 #include <linux/in.h>
  18 #include <linux/namei.h>
  19 #include <linux/unistd.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/sunrpc/svc.h>
  23 #include <linux/nfsd/nfsd.h>
  24 #include <linux/nfsd/cache.h>
  25 #include <linux/nfsd/xdr.h>
  26
  27 typedef struct svc_rqst svc_rqst;
  28 typedef struct svc_buf  svc_buf;
  29
  30 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  31
  32
  33 static int
  34 nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  35 {
  36         return nfs_ok;
  37 }
  38
  39 /*
  40  * Get a file's attributes
  41  * N.B. After this call resp->fh needs an fh_put
  42  */
  43 static int
  44 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
  45                                           struct nfsd_attrstat *resp)
  46 {
  47         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  48
  49         fh_copy(&resp->fh, &argp->fh);
  50         return fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
  51 }
  52
  53 /*
  54  * Set a file's attributes
  55  * N.B. After this call resp->fh needs an fh_put
  56  */
  57 static int
  58 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
  59                                           struct nfsd_attrstat  *resp)
  60 {
  61         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  62                 SVCFH_fmt(&argp->fh),
  63                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  64
  65         fh_copy(&resp->fh, &argp->fh);
  66         return nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
  67 }
  68
  69 /*
  70  * Look up a path name component
  71  * Note: the dentry in the resp->fh may be negative if the file
  72  * doesn't exist yet.
  73  * N.B. After this call resp->fh needs an fh_put
  74  */
  75 static int
  76 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
  77                                          struct nfsd_diropres  *resp)
  78 {
  79         int     nfserr;
  80
  81         dprintk("nfsd: LOOKUP   %s %.*s\n",
  82                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
  83
  84         fh_init(&resp->fh, NFS_FHSIZE);
  85         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
  86                                  &resp->fh);
  87
  88         fh_put(&argp->fh);
  89         return nfserr;
  90 }
  91
  92 /*
  93  * Read a symlink.
  94  */
  95 static int
  96 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
  97                                            struct nfsd_readlinkres *resp)
  98 {
  99         int     nfserr;
 100
 101         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 102
 103         /* Read the symlink. */
 104         resp->len = NFS_MAXPATHLEN;
 105         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 106
 107         fh_put(&argp->fh);
 108         return nfserr;
 109 }
 110
 111 /*
 112  * Read a portion of a file.
 113  * N.B. After this call resp->fh needs an fh_put
 114  */
 115 static int
 116 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
 117                                        struct nfsd_readres  *resp)
 118 {
 119         int     nfserr;
 120
 121         dprintk("nfsd: READ    %s %d bytes at %d\n",
 122                 SVCFH_fmt(&argp->fh),
 123                 argp->count, argp->offset);
 124
 125         /* Obtain buffer pointer for payload. 19 is 1 word for
 126          * status, 17 words for fattr, and 1 word for the byte count.
 127          */
 128
 129         if (NFSSVC_MAXBLKSIZE < argp->count) {
 130                 printk(KERN_NOTICE
 131                         "oversized read request from %u.%u.%u.%u:%d (%d bytes)\n",
 132                                 NIPQUAD(rqstp->rq_addr.sin_addr.s_addr),
 133                                 ntohs(rqstp->rq_addr.sin_port),
 134                                 argp->count);
 135                 argp->count = NFSSVC_MAXBLKSIZE;
 136         }
 137         svc_reserve(rqstp, (19<<2) + argp->count + 4);
 138
 139         resp->count = argp->count;
 140         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 141                                   argp->offset,
 142                                   argp->vec, argp->vlen,
 143                                   &resp->count);
 144
 145         return nfserr;
 146 }
 147
 148 /*
 149  * Write data to a file
 150  * N.B. After this call resp->fh needs an fh_put
 151  */
 152 static int
 153 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 154                                         struct nfsd_attrstat  *resp)
 155 {
 156         int     nfserr;
 157         int     stable = 1;
 158
 159         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 160                 SVCFH_fmt(&argp->fh),
 161                 argp->len, argp->offset);
 162
 163         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 164                                    argp->offset,
 165                                    argp->vec, argp->vlen,
 166                                    argp->len,
 167                                    &stable);
 168         return nfserr;
 169 }
 170
 171 /*
 172  * CREATE processing is complicated. The keyword here is `overloaded.'
 173  * The parent directory is kept locked between the check for existence
 174  * and the actual create() call in compliance with VFS protocols.
 175  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 176  */
 177 static int
 178 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 179                                          struct nfsd_diropres   *resp)
 180 {
 181         svc_fh          *dirfhp = &argp->fh;
 182         svc_fh          *newfhp = &resp->fh;
 183         struct iattr    *attr = &argp->attrs;
 184         struct inode    *inode;
 185         struct dentry   *dchild;
 186         int             nfserr, type, mode;
 187         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 188
 189         dprintk("nfsd: CREATE   %s %.*s\n",
 190                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 191
 192         /* First verify the parent file handle */
 193         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_EXEC);
 194         if (nfserr)
 195                 goto done; /* must fh_put dirfhp even on error */
 196
 197         /* Check for MAY_WRITE in nfsd_create if necessary */
 198
 199         nfserr = nfserr_acces;
 200         if (!argp->len)
 201                 goto done;
 202         nfserr = nfserr_exist;
 203         if (isdotent(argp->name, argp->len))
 204                 goto done;
 205         fh_lock(dirfhp);
 206         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 207         if (IS_ERR(dchild)) {
 208                 nfserr = nfserrno(PTR_ERR(dchild));
 209                 goto out_unlock;
 210         }
 211         fh_init(newfhp, NFS_FHSIZE);
 212         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 213         if (!nfserr && !dchild->d_inode)
 214                 nfserr = nfserr_noent;
 215         dput(dchild);
 216         if (nfserr) {
 217                 if (nfserr != nfserr_noent)
 218                         goto out_unlock;
 219                 /*
 220                  * If the new file handle wasn't verified, we can't tell
 221                  * whether the file exists or not. Time to bail ...
 222                  */
 223                 nfserr = nfserr_acces;
 224                 if (!newfhp->fh_dentry) {
 225                         printk(KERN_WARNING
 226                                 "nfsd_proc_create: file handle not verified\n");
 227                         goto out_unlock;
 228                 }
 229         }
 230
 231         inode = newfhp->fh_dentry->d_inode;
 232
 233         /* Unfudge the mode bits */
 234         if (attr->ia_valid & ATTR_MODE) {
 235                 type = attr->ia_mode & S_IFMT;
 236                 mode = attr->ia_mode & ~S_IFMT;
 237                 if (!type) {
 238                         /* no type, so if target exists, assume same as that,
 239                          * else assume a file */
 240                         if (inode) {
 241                                 type = inode->i_mode & S_IFMT;
 242                                 switch(type) {
 243                                 case S_IFCHR:
 244                                 case S_IFBLK:
 245                                         /* reserve rdev for later checking */
 246                                         rdev = inode->i_rdev;
 247                                         attr->ia_valid |= ATTR_SIZE;
 248
 249                                         /* FALLTHROUGH */
 250                                 case S_IFIFO:
 251                                         /* this is probably a permission check..
 252                                          * at least IRIX implements perm checking on
 253                                          *   echo thing > device-special-file-or-pipe
 254                                          * by doing a CREATE with type==0
 255                                          */
 256                                         nfserr = nfsd_permission(newfhp->fh_export,
 257                                                                  newfhp->fh_dentry,
 258                                                                  MAY_WRITE|MAY_LOCAL_ACCESS);
 259                                         if (nfserr && nfserr != nfserr_rofs)
 260                                                 goto out_unlock;
 261                                 }
 262                         } else
 263                                 type = S_IFREG;
 264                 }
 265         } else if (inode) {
 266                 type = inode->i_mode & S_IFMT;
 267                 mode = inode->i_mode & ~S_IFMT;
 268         } else {
 269                 type = S_IFREG;
 270                 mode = 0;       /* ??? */
 271         }
 272
 273         attr->ia_valid |= ATTR_MODE;
 274         attr->ia_mode = mode;
 275
 276         /* Special treatment for non-regular files according to the
 277          * gospel of sun micro
 278          */
 279         if (type != S_IFREG) {
 280                 int     is_borc = 0;
 281                 if (type != S_IFBLK && type != S_IFCHR) {
 282                         rdev = 0;
 283                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 284                         /* If you think you've seen the worst, grok this. */
 285                         type = S_IFIFO;
 286                 } else {
 287                         /* Okay, char or block special */
 288                         is_borc = 1;
 289                         if (!rdev)
 290                                 rdev = wanted;
 291                 }
 292
 293                 /* we've used the SIZE information, so discard it */
 294                 attr->ia_valid &= ~ATTR_SIZE;
 295
 296                 /* Make sure the type and device matches */
 297                 nfserr = nfserr_exist;
 298                 if (inode && type != (inode->i_mode & S_IFMT))
 299                         goto out_unlock;
 300         }
 301
 302         nfserr = 0;
 303         if (!inode) {
 304                 /* File doesn't exist. Create it and set attrs */
 305                 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 306                                         attr, type, rdev, newfhp);
 307         } else if (type == S_IFREG) {
 308                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 309                         argp->name, attr->ia_valid, (long) attr->ia_size);
 310                 /* File already exists. We ignore all attributes except
 311                  * size, so that creat() behaves exactly like
 312                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 313                  */
 314                 attr->ia_valid &= ATTR_SIZE;
 315                 if (attr->ia_valid)
 316                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 317         }
 318
 319 out_unlock:
 320         /* We don't really need to unlock, as fh_put does it. */
 321         fh_unlock(dirfhp);
 322
 323 done:
 324         fh_put(dirfhp);
 325         return nfserr;
 326 }
 327
 328 static int
 329 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 330                                          void                  *resp)
 331 {
 332         int     nfserr;
 333
 334         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 335                 argp->len, argp->name);
 336
 337         /* Unlink. -SIFDIR means file must not be a directory */
 338         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 339         fh_put(&argp->fh);
 340         return nfserr;
 341 }
 342
 343 static int
 344 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
 345                                          void                   *resp)
 346 {
 347         int     nfserr;
 348
 349         dprintk("nfsd: RENAME   %s %.*s -> \n",
 350                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 351         dprintk("nfsd:        ->  %s %.*s\n",
 352                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 353
 354         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 355                                     &argp->tfh, argp->tname, argp->tlen);
 356         fh_put(&argp->ffh);
 357         fh_put(&argp->tfh);
 358         return nfserr;
 359 }
 360
 361 static int
 362 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
 363                                 void                        *resp)
 364 {
 365         int     nfserr;
 366
 367         dprintk("nfsd: LINK     %s ->\n",
 368                 SVCFH_fmt(&argp->ffh));
 369         dprintk("nfsd:    %s %.*s\n",
 370                 SVCFH_fmt(&argp->tfh),
 371                 argp->tlen,
 372                 argp->tname);
 373
 374         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 375                                   &argp->ffh);
 376         fh_put(&argp->ffh);
 377         fh_put(&argp->tfh);
 378         return nfserr;
 379 }
 380
 381 static int
 382 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
 383                                           void                    *resp)
 384 {
 385         struct svc_fh   newfh;
 386         int             nfserr;
 387
 388         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 389                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 390                 argp->tlen, argp->tname);
 391
 392         fh_init(&newfh, NFS_FHSIZE);
 393         /*
 394          * Create the link, look up new file and set attrs.
 395          */
 396         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 397                                                  argp->tname, argp->tlen,
 398                                                  &newfh, &argp->attrs);
 399
 400
 401         fh_put(&argp->ffh);
 402         fh_put(&newfh);
 403         return nfserr;
 404 }
 405
 406 /*
 407  * Make directory. This operation is not idempotent.
 408  * N.B. After this call resp->fh needs an fh_put
 409  */
 410 static int
 411 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 412                                         struct nfsd_diropres   *resp)
 413 {
 414         int     nfserr;
 415
 416         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 417
 418         if (resp->fh.fh_dentry) {
 419                 printk(KERN_WARNING
 420                         "nfsd_proc_mkdir: response already verified??\n");
 421         }
 422
 423         argp->attrs.ia_valid &= ~ATTR_SIZE;
 424         fh_init(&resp->fh, NFS_FHSIZE);
 425         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 426                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 427         fh_put(&argp->fh);
 428         return nfserr;
 429 }
 430
 431 /*
 432  * Remove a directory
 433  */
 434 static int
 435 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 436                                         void                  *resp)
 437 {
 438         int     nfserr;
 439
 440         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 441
 442         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 443         fh_put(&argp->fh);
 444         return nfserr;
 445 }
 446
 447 /*
 448  * Read a portion of a directory.
 449  */
 450 static int
 451 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
 452                                           struct nfsd_readdirres  *resp)
 453 {
 454         int             nfserr, count;
 455         loff_t          offset;
 456
 457         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 458                 SVCFH_fmt(&argp->fh),
 459                 argp->count, argp->cookie);
 460
 461         /* Shrink to the client read size */
 462         count = (argp->count >> 2) - 2;
 463
 464         /* Make sure we've room for the NULL ptr & eof flag */
 465         count -= 2;
 466         if (count < 0)
 467                 count = 0;
 468
 469         resp->buffer = argp->buffer;
 470         resp->offset = NULL;
 471         resp->buflen = count;
 472         resp->common.err = nfs_ok;
 473         /* Read directory and encode entries on the fly */
 474         offset = argp->cookie;
 475         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 476                               &resp->common, nfssvc_encode_entry);
 477
 478         resp->count = resp->buffer - argp->buffer;
 479         if (resp->offset)
 480                 *resp->offset = htonl(offset);
 481
 482         fh_put(&argp->fh);
 483         return nfserr;
 484 }
 485
 486 /*
 487  * Get file system info
 488  */
 489 static int
 490 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
 491                                           struct nfsd_statfsres *resp)
 492 {
 493         int     nfserr;
 494
 495         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 496
 497         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats);
 498         fh_put(&argp->fh);
 499         return nfserr;
 500 }
 501
 502 /*
 503  * NFSv2 Server procedures.
 504  * Only the results of non-idempotent operations are cached.
 505  */
 506 #define nfsd_proc_none          NULL
 507 #define nfssvc_release_none     NULL
 508 struct nfsd_void { int dummy; };
 509
 510 #define PROC(name, argt, rest, relt, cache, respsize)   \
 511  { (svc_procfunc) nfsd_proc_##name,             \
 512    (kxdrproc_t) nfssvc_decode_##argt,           \
 513    (kxdrproc_t) nfssvc_encode_##rest,           \
 514    (kxdrproc_t) nfssvc_release_##relt,          \
 515    sizeof(struct nfsd_##argt),                  \
 516    sizeof(struct nfsd_##rest),                  \
 517    0,                                           \
 518    cache,                                       \
 519    respsize,                                    \
 520  }
 521
 522 #define ST 1            /* status */
 523 #define FH 8            /* filehandle */
 524 #define AT 18           /* attributes */
 525
 526 static struct svc_procedure             nfsd_procedures2[18] = {
 527   PROC(null,     void,          void,           none,           RC_NOCACHE, ST),
 528   PROC(getattr,  fhandle,       attrstat,       fhandle,        RC_NOCACHE, ST+AT),
 529   PROC(setattr,  sattrargs,     attrstat,       fhandle,        RC_REPLBUFF, ST+AT),
 530   PROC(none,     void,          void,           none,           RC_NOCACHE, ST),
 531   PROC(lookup,   diropargs,     diropres,       fhandle,        RC_NOCACHE, ST+FH+AT),
 532   PROC(readlink, readlinkargs,  readlinkres,    none,           RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4),
 533   PROC(read,     readargs,      readres,        fhandle,        RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE),
 534   PROC(none,     void,          void,           none,           RC_NOCACHE, ST),
 535   PROC(write,    writeargs,     attrstat,       fhandle,        RC_REPLBUFF, ST+AT),
 536   PROC(create,   createargs,    diropres,       fhandle,        RC_REPLBUFF, ST+FH+AT),
 537   PROC(remove,   diropargs,     void,           none,           RC_REPLSTAT, ST),
 538   PROC(rename,   renameargs,    void,           none,           RC_REPLSTAT, ST),
 539   PROC(link,     linkargs,      void,           none,           RC_REPLSTAT, ST),
 540   PROC(symlink,  symlinkargs,   void,           none,           RC_REPLSTAT, ST),
 541   PROC(mkdir,    createargs,    diropres,       fhandle,        RC_REPLBUFF, ST+FH+AT),
 542   PROC(rmdir,    diropargs,     void,           none,           RC_REPLSTAT, ST),
 543   PROC(readdir,  readdirargs,   readdirres,     none,           RC_NOCACHE, 0),
 544   PROC(statfs,   fhandle,       statfsres,      none,           RC_NOCACHE, ST+5),
 545 };
 546
 547
 548 struct svc_version      nfsd_version2 = {
 549                 .vs_vers        = 2,
 550                 .vs_nproc       = 18,
 551                 .vs_proc        = nfsd_procedures2,
 552                 .vs_dispatch    = nfsd_dispatch,
 553                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 554 };
 555
 556 /*
 557  * Map errnos to NFS errnos.
 558  */
 559 int
 560 nfserrno (int errno)
 561 {
 562         static struct {
 563                 int     nfserr;
 564                 int     syserr;
 565         } nfs_errtbl[] = {
 566                 { nfs_ok, 0 },
 567                 { nfserr_perm, -EPERM },
 568                 { nfserr_noent, -ENOENT },
 569                 { nfserr_io, -EIO },
 570                 { nfserr_nxio, -ENXIO },
 571                 { nfserr_acces, -EACCES },
 572                 { nfserr_exist, -EEXIST },
 573                 { nfserr_xdev, -EXDEV },
 574                 { nfserr_mlink, -EMLINK },
 575                 { nfserr_nodev, -ENODEV },
 576                 { nfserr_notdir, -ENOTDIR },
 577                 { nfserr_isdir, -EISDIR },
 578                 { nfserr_inval, -EINVAL },
 579                 { nfserr_fbig, -EFBIG },
 580                 { nfserr_nospc, -ENOSPC },
 581                 { nfserr_rofs, -EROFS },
 582                 { nfserr_mlink, -EMLINK },
 583                 { nfserr_nametoolong, -ENAMETOOLONG },
 584                 { nfserr_notempty, -ENOTEMPTY },
 585 #ifdef EDQUOT
 586                 { nfserr_dquot, -EDQUOT },
 587 #endif
 588                 { nfserr_stale, -ESTALE },
 589                 { nfserr_jukebox, -ETIMEDOUT },
 590                 { nfserr_dropit, -EAGAIN },
 591                 { nfserr_dropit, -ENOMEM },
 592                 { nfserr_badname, -ESRCH },
 593                 { nfserr_io, -ETXTBSY },
 594                 { -1, -EIO }
 595         };
 596         int     i;
 597
 598         for (i = 0; nfs_errtbl[i].nfserr != -1; i++) {
 599                 if (nfs_errtbl[i].syserr == errno)
 600                         return nfs_errtbl[i].nfserr;
 601         }
 602         printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
 603         return nfserr_io;
 604 }
 605