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/clnt.h>
  23 #include <linux/sunrpc/svc.h>
  24 #include <linux/nfsd/nfsd.h>
  25 #include <linux/nfsd/cache.h>
  26 #include <linux/nfsd/xdr.h>
  27
  28 typedef struct svc_rqst svc_rqst;
  29 typedef struct svc_buf  svc_buf;
  30
  31 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  32
  33
  34 static __be32
  35 nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  36 {
  37         return nfs_ok;
  38 }
  39
  40 static __be32
  41 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
  42 {
  43         if (err) return err;
  44         return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
  45                                     resp->fh.fh_dentry,
  46                                     &resp->stat));
  47 }
  48 static __be32
  49 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
  50 {
  51         if (err) return err;
  52         return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
  53                                     resp->fh.fh_dentry,
  54                                     &resp->stat));
  55 }
  56 /*
  57  * Get a file's attributes
  58  * N.B. After this call resp->fh needs an fh_put
  59  */
  60 static __be32
  61 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
  62                                           struct nfsd_attrstat *resp)
  63 {
  64         __be32 nfserr;
  65         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  66
  67         fh_copy(&resp->fh, &argp->fh);
  68         nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
  69         return nfsd_return_attrs(nfserr, resp);
  70 }
  71
  72 /*
  73  * Set a file's attributes
  74  * N.B. After this call resp->fh needs an fh_put
  75  */
  76 static __be32
  77 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
  78                                           struct nfsd_attrstat  *resp)
  79 {
  80         __be32 nfserr;
  81         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  82                 SVCFH_fmt(&argp->fh),
  83                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  84
  85         fh_copy(&resp->fh, &argp->fh);
  86         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
  87         return nfsd_return_attrs(nfserr, resp);
  88 }
  89
  90 /*
  91  * Look up a path name component
  92  * Note: the dentry in the resp->fh may be negative if the file
  93  * doesn't exist yet.
  94  * N.B. After this call resp->fh needs an fh_put
  95  */
  96 static __be32
  97 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
  98                                          struct nfsd_diropres  *resp)
  99 {
 100         __be32  nfserr;
 101
 102         dprintk("nfsd: LOOKUP   %s %.*s\n",
 103                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 104
 105         fh_init(&resp->fh, NFS_FHSIZE);
 106         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 107                                  &resp->fh);
 108
 109         fh_put(&argp->fh);
 110         return nfsd_return_dirop(nfserr, resp);
 111 }
 112
 113 /*
 114  * Read a symlink.
 115  */
 116 static __be32
 117 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
 118                                            struct nfsd_readlinkres *resp)
 119 {
 120         __be32  nfserr;
 121
 122         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 123
 124         /* Read the symlink. */
 125         resp->len = NFS_MAXPATHLEN;
 126         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 127
 128         fh_put(&argp->fh);
 129         return nfserr;
 130 }
 131
 132 /*
 133  * Read a portion of a file.
 134  * N.B. After this call resp->fh needs an fh_put
 135  */
 136 static __be32
 137 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
 138                                        struct nfsd_readres  *resp)
 139 {
 140         __be32  nfserr;
 141
 142         dprintk("nfsd: READ    %s %d bytes at %d\n",
 143                 SVCFH_fmt(&argp->fh),
 144                 argp->count, argp->offset);
 145
 146         /* Obtain buffer pointer for payload. 19 is 1 word for
 147          * status, 17 words for fattr, and 1 word for the byte count.
 148          */
 149
 150         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 151                 char buf[RPC_MAX_ADDRBUFLEN];
 152                 printk(KERN_NOTICE
 153                         "oversized read request from %s (%d bytes)\n",
 154                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 155                                 argp->count);
 156                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 157         }
 158         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 159
 160         resp->count = argp->count;
 161         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 162                                   argp->offset,
 163                                   rqstp->rq_vec, argp->vlen,
 164                                   &resp->count);
 165
 166         if (nfserr) return nfserr;
 167         return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
 168                                     resp->fh.fh_dentry,
 169                                     &resp->stat));
 170 }
 171
 172 /*
 173  * Write data to a file
 174  * N.B. After this call resp->fh needs an fh_put
 175  */
 176 static __be32
 177 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 178                                         struct nfsd_attrstat  *resp)
 179 {
 180         __be32  nfserr;
 181         int     stable = 1;
 182
 183         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 184                 SVCFH_fmt(&argp->fh),
 185                 argp->len, argp->offset);
 186
 187         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 188                                    argp->offset,
 189                                    rqstp->rq_vec, argp->vlen,
 190                                    argp->len,
 191                                    &stable);
 192         return nfsd_return_attrs(nfserr, resp);
 193 }
 194
 195 /*
 196  * CREATE processing is complicated. The keyword here is `overloaded.'
 197  * The parent directory is kept locked between the check for existence
 198  * and the actual create() call in compliance with VFS protocols.
 199  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 200  */
 201 static __be32
 202 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 203                                          struct nfsd_diropres   *resp)
 204 {
 205         svc_fh          *dirfhp = &argp->fh;
 206         svc_fh          *newfhp = &resp->fh;
 207         struct iattr    *attr = &argp->attrs;
 208         struct inode    *inode;
 209         struct dentry   *dchild;
 210         int             type, mode;
 211         __be32          nfserr;
 212         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 213
 214         dprintk("nfsd: CREATE   %s %.*s\n",
 215                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 216
 217         /* First verify the parent file handle */
 218         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_EXEC);
 219         if (nfserr)
 220                 goto done; /* must fh_put dirfhp even on error */
 221
 222         /* Check for MAY_WRITE in nfsd_create if necessary */
 223
 224         nfserr = nfserr_acces;
 225         if (!argp->len)
 226                 goto done;
 227         nfserr = nfserr_exist;
 228         if (isdotent(argp->name, argp->len))
 229                 goto done;
 230         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 231         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 232         if (IS_ERR(dchild)) {
 233                 nfserr = nfserrno(PTR_ERR(dchild));
 234                 goto out_unlock;
 235         }
 236         fh_init(newfhp, NFS_FHSIZE);
 237         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 238         if (!nfserr && !dchild->d_inode)
 239                 nfserr = nfserr_noent;
 240         dput(dchild);
 241         if (nfserr) {
 242                 if (nfserr != nfserr_noent)
 243                         goto out_unlock;
 244                 /*
 245                  * If the new file handle wasn't verified, we can't tell
 246                  * whether the file exists or not. Time to bail ...
 247                  */
 248                 nfserr = nfserr_acces;
 249                 if (!newfhp->fh_dentry) {
 250                         printk(KERN_WARNING
 251                                 "nfsd_proc_create: file handle not verified\n");
 252                         goto out_unlock;
 253                 }
 254         }
 255
 256         inode = newfhp->fh_dentry->d_inode;
 257
 258         /* Unfudge the mode bits */
 259         if (attr->ia_valid & ATTR_MODE) {
 260                 type = attr->ia_mode & S_IFMT;
 261                 mode = attr->ia_mode & ~S_IFMT;
 262                 if (!type) {
 263                         /* no type, so if target exists, assume same as that,
 264                          * else assume a file */
 265                         if (inode) {
 266                                 type = inode->i_mode & S_IFMT;
 267                                 switch(type) {
 268                                 case S_IFCHR:
 269                                 case S_IFBLK:
 270                                         /* reserve rdev for later checking */
 271                                         rdev = inode->i_rdev;
 272                                         attr->ia_valid |= ATTR_SIZE;
 273
 274                                         /* FALLTHROUGH */
 275                                 case S_IFIFO:
 276                                         /* this is probably a permission check..
 277                                          * at least IRIX implements perm checking on
 278                                          *   echo thing > device-special-file-or-pipe
 279                                          * by doing a CREATE with type==0
 280                                          */
 281                                         nfserr = nfsd_permission(rqstp,
 282                                                                  newfhp->fh_export,
 283                                                                  newfhp->fh_dentry,
 284                                                                  MAY_WRITE|MAY_LOCAL_ACCESS);
 285                                         if (nfserr && nfserr != nfserr_rofs)
 286                                                 goto out_unlock;
 287                                 }
 288                         } else
 289                                 type = S_IFREG;
 290                 }
 291         } else if (inode) {
 292                 type = inode->i_mode & S_IFMT;
 293                 mode = inode->i_mode & ~S_IFMT;
 294         } else {
 295                 type = S_IFREG;
 296                 mode = 0;       /* ??? */
 297         }
 298
 299         attr->ia_valid |= ATTR_MODE;
 300         attr->ia_mode = mode;
 301
 302         /* Special treatment for non-regular files according to the
 303          * gospel of sun micro
 304          */
 305         if (type != S_IFREG) {
 306                 int     is_borc = 0;
 307                 if (type != S_IFBLK && type != S_IFCHR) {
 308                         rdev = 0;
 309                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 310                         /* If you think you've seen the worst, grok this. */
 311                         type = S_IFIFO;
 312                 } else {
 313                         /* Okay, char or block special */
 314                         is_borc = 1;
 315                         if (!rdev)
 316                                 rdev = wanted;
 317                 }
 318
 319                 /* we've used the SIZE information, so discard it */
 320                 attr->ia_valid &= ~ATTR_SIZE;
 321
 322                 /* Make sure the type and device matches */
 323                 nfserr = nfserr_exist;
 324                 if (inode && type != (inode->i_mode & S_IFMT))
 325                         goto out_unlock;
 326         }
 327
 328         nfserr = 0;
 329         if (!inode) {
 330                 /* File doesn't exist. Create it and set attrs */
 331                 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 332                                         attr, type, rdev, newfhp);
 333         } else if (type == S_IFREG) {
 334                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 335                         argp->name, attr->ia_valid, (long) attr->ia_size);
 336                 /* File already exists. We ignore all attributes except
 337                  * size, so that creat() behaves exactly like
 338                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 339                  */
 340                 attr->ia_valid &= ATTR_SIZE;
 341                 if (attr->ia_valid)
 342                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 343         }
 344
 345 out_unlock:
 346         /* We don't really need to unlock, as fh_put does it. */
 347         fh_unlock(dirfhp);
 348
 349 done:
 350         fh_put(dirfhp);
 351         return nfsd_return_dirop(nfserr, resp);
 352 }
 353
 354 static __be32
 355 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 356                                          void                  *resp)
 357 {
 358         __be32  nfserr;
 359
 360         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 361                 argp->len, argp->name);
 362
 363         /* Unlink. -SIFDIR means file must not be a directory */
 364         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 365         fh_put(&argp->fh);
 366         return nfserr;
 367 }
 368
 369 static __be32
 370 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
 371                                          void                   *resp)
 372 {
 373         __be32  nfserr;
 374
 375         dprintk("nfsd: RENAME   %s %.*s -> \n",
 376                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 377         dprintk("nfsd:        ->  %s %.*s\n",
 378                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 379
 380         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 381                                     &argp->tfh, argp->tname, argp->tlen);
 382         fh_put(&argp->ffh);
 383         fh_put(&argp->tfh);
 384         return nfserr;
 385 }
 386
 387 static __be32
 388 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
 389                                 void                        *resp)
 390 {
 391         __be32  nfserr;
 392
 393         dprintk("nfsd: LINK     %s ->\n",
 394                 SVCFH_fmt(&argp->ffh));
 395         dprintk("nfsd:    %s %.*s\n",
 396                 SVCFH_fmt(&argp->tfh),
 397                 argp->tlen,
 398                 argp->tname);
 399
 400         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 401                                   &argp->ffh);
 402         fh_put(&argp->ffh);
 403         fh_put(&argp->tfh);
 404         return nfserr;
 405 }
 406
 407 static __be32
 408 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
 409                                           void                    *resp)
 410 {
 411         struct svc_fh   newfh;
 412         __be32          nfserr;
 413
 414         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 415                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 416                 argp->tlen, argp->tname);
 417
 418         fh_init(&newfh, NFS_FHSIZE);
 419         /*
 420          * Create the link, look up new file and set attrs.
 421          */
 422         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 423                                                  argp->tname, argp->tlen,
 424                                                  &newfh, &argp->attrs);
 425
 426
 427         fh_put(&argp->ffh);
 428         fh_put(&newfh);
 429         return nfserr;
 430 }
 431
 432 /*
 433  * Make directory. This operation is not idempotent.
 434  * N.B. After this call resp->fh needs an fh_put
 435  */
 436 static __be32
 437 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 438                                         struct nfsd_diropres   *resp)
 439 {
 440         __be32  nfserr;
 441
 442         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 443
 444         if (resp->fh.fh_dentry) {
 445                 printk(KERN_WARNING
 446                         "nfsd_proc_mkdir: response already verified??\n");
 447         }
 448
 449         argp->attrs.ia_valid &= ~ATTR_SIZE;
 450         fh_init(&resp->fh, NFS_FHSIZE);
 451         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 452                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 453         fh_put(&argp->fh);
 454         return nfsd_return_dirop(nfserr, resp);
 455 }
 456
 457 /*
 458  * Remove a directory
 459  */
 460 static __be32
 461 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 462                                         void                  *resp)
 463 {
 464         __be32  nfserr;
 465
 466         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 467
 468         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 469         fh_put(&argp->fh);
 470         return nfserr;
 471 }
 472
 473 /*
 474  * Read a portion of a directory.
 475  */
 476 static __be32
 477 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
 478                                           struct nfsd_readdirres  *resp)
 479 {
 480         int             count;
 481         __be32          nfserr;
 482         loff_t          offset;
 483
 484         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 485                 SVCFH_fmt(&argp->fh),
 486                 argp->count, argp->cookie);
 487
 488         /* Shrink to the client read size */
 489         count = (argp->count >> 2) - 2;
 490
 491         /* Make sure we've room for the NULL ptr & eof flag */
 492         count -= 2;
 493         if (count < 0)
 494                 count = 0;
 495
 496         resp->buffer = argp->buffer;
 497         resp->offset = NULL;
 498         resp->buflen = count;
 499         resp->common.err = nfs_ok;
 500         /* Read directory and encode entries on the fly */
 501         offset = argp->cookie;
 502         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 503                               &resp->common, nfssvc_encode_entry);
 504
 505         resp->count = resp->buffer - argp->buffer;
 506         if (resp->offset)
 507                 *resp->offset = htonl(offset);
 508
 509         fh_put(&argp->fh);
 510         return nfserr;
 511 }
 512
 513 /*
 514  * Get file system info
 515  */
 516 static __be32
 517 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
 518                                           struct nfsd_statfsres *resp)
 519 {
 520         __be32  nfserr;
 521
 522         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 523
 524         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats);
 525         fh_put(&argp->fh);
 526         return nfserr;
 527 }
 528
 529 /*
 530  * NFSv2 Server procedures.
 531  * Only the results of non-idempotent operations are cached.
 532  */
 533 #define nfsd_proc_none          NULL
 534 #define nfssvc_release_none     NULL
 535 struct nfsd_void { int dummy; };
 536
 537 #define PROC(name, argt, rest, relt, cache, respsize)   \
 538  { (svc_procfunc) nfsd_proc_##name,             \
 539    (kxdrproc_t) nfssvc_decode_##argt,           \
 540    (kxdrproc_t) nfssvc_encode_##rest,           \
 541    (kxdrproc_t) nfssvc_release_##relt,          \
 542    sizeof(struct nfsd_##argt),                  \
 543    sizeof(struct nfsd_##rest),                  \
 544    0,                                           \
 545    cache,                                       \
 546    respsize,                                    \
 547  }
 548
 549 #define ST 1            /* status */
 550 #define FH 8            /* filehandle */
 551 #define AT 18           /* attributes */
 552
 553 static struct svc_procedure             nfsd_procedures2[18] = {
 554   PROC(null,     void,          void,           none,           RC_NOCACHE, ST),
 555   PROC(getattr,  fhandle,       attrstat,       fhandle,        RC_NOCACHE, ST+AT),
 556   PROC(setattr,  sattrargs,     attrstat,       fhandle,        RC_REPLBUFF, ST+AT),
 557   PROC(none,     void,          void,           none,           RC_NOCACHE, ST),
 558   PROC(lookup,   diropargs,     diropres,       fhandle,        RC_NOCACHE, ST+FH+AT),
 559   PROC(readlink, readlinkargs,  readlinkres,    none,           RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4),
 560   PROC(read,     readargs,      readres,        fhandle,        RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4),
 561   PROC(none,     void,          void,           none,           RC_NOCACHE, ST),
 562   PROC(write,    writeargs,     attrstat,       fhandle,        RC_REPLBUFF, ST+AT),
 563   PROC(create,   createargs,    diropres,       fhandle,        RC_REPLBUFF, ST+FH+AT),
 564   PROC(remove,   diropargs,     void,           none,           RC_REPLSTAT, ST),
 565   PROC(rename,   renameargs,    void,           none,           RC_REPLSTAT, ST),
 566   PROC(link,     linkargs,      void,           none,           RC_REPLSTAT, ST),
 567   PROC(symlink,  symlinkargs,   void,           none,           RC_REPLSTAT, ST),
 568   PROC(mkdir,    createargs,    diropres,       fhandle,        RC_REPLBUFF, ST+FH+AT),
 569   PROC(rmdir,    diropargs,     void,           none,           RC_REPLSTAT, ST),
 570   PROC(readdir,  readdirargs,   readdirres,     none,           RC_NOCACHE, 0),
 571   PROC(statfs,   fhandle,       statfsres,      none,           RC_NOCACHE, ST+5),
 572 };
 573
 574
 575 struct svc_version      nfsd_version2 = {
 576                 .vs_vers        = 2,
 577                 .vs_nproc       = 18,
 578                 .vs_proc        = nfsd_procedures2,
 579                 .vs_dispatch    = nfsd_dispatch,
 580                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 581 };
 582
 583 /*
 584  * Map errnos to NFS errnos.
 585  */
 586 __be32
 587 nfserrno (int errno)
 588 {
 589         static struct {
 590                 __be32  nfserr;
 591                 int     syserr;
 592         } nfs_errtbl[] = {
 593                 { nfs_ok, 0 },
 594                 { nfserr_perm, -EPERM },
 595                 { nfserr_noent, -ENOENT },
 596                 { nfserr_io, -EIO },
 597                 { nfserr_nxio, -ENXIO },
 598                 { nfserr_acces, -EACCES },
 599                 { nfserr_exist, -EEXIST },
 600                 { nfserr_xdev, -EXDEV },
 601                 { nfserr_mlink, -EMLINK },
 602                 { nfserr_nodev, -ENODEV },
 603                 { nfserr_notdir, -ENOTDIR },
 604                 { nfserr_isdir, -EISDIR },
 605                 { nfserr_inval, -EINVAL },
 606                 { nfserr_fbig, -EFBIG },
 607                 { nfserr_nospc, -ENOSPC },
 608                 { nfserr_rofs, -EROFS },
 609                 { nfserr_mlink, -EMLINK },
 610                 { nfserr_nametoolong, -ENAMETOOLONG },
 611                 { nfserr_notempty, -ENOTEMPTY },
 612 #ifdef EDQUOT
 613                 { nfserr_dquot, -EDQUOT },
 614 #endif
 615                 { nfserr_stale, -ESTALE },
 616                 { nfserr_jukebox, -ETIMEDOUT },
 617                 { nfserr_dropit, -EAGAIN },
 618                 { nfserr_dropit, -ENOMEM },
 619                 { nfserr_badname, -ESRCH },
 620                 { nfserr_io, -ETXTBSY },
 621                 { nfserr_notsupp, -EOPNOTSUPP },
 622         };
 623         int     i;
 624
 625         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 626                 if (nfs_errtbl[i].syserr == errno)
 627                         return nfs_errtbl[i].nfserr;
 628         }
 629         printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
 630         return nfserr_io;
 631 }
 632