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,
  69                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  70         return nfsd_return_attrs(nfserr, resp);
  71 }
  72
  73 /*
  74  * Set a file's attributes
  75  * N.B. After this call resp->fh needs an fh_put
  76  */
  77 static __be32
  78 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
  79                                           struct nfsd_attrstat  *resp)
  80 {
  81         __be32 nfserr;
  82         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  83                 SVCFH_fmt(&argp->fh),
  84                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  85
  86         fh_copy(&resp->fh, &argp->fh);
  87         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
  88         return nfsd_return_attrs(nfserr, resp);
  89 }
  90
  91 /*
  92  * Look up a path name component
  93  * Note: the dentry in the resp->fh may be negative if the file
  94  * doesn't exist yet.
  95  * N.B. After this call resp->fh needs an fh_put
  96  */
  97 static __be32
  98 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
  99                                          struct nfsd_diropres  *resp)
 100 {
 101         __be32  nfserr;
 102
 103         dprintk("nfsd: LOOKUP   %s %.*s\n",
 104                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 105
 106         fh_init(&resp->fh, NFS_FHSIZE);
 107         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 108                                  &resp->fh);
 109
 110         fh_put(&argp->fh);
 111         return nfsd_return_dirop(nfserr, resp);
 112 }
 113
 114 /*
 115  * Read a symlink.
 116  */
 117 static __be32
 118 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
 119                                            struct nfsd_readlinkres *resp)
 120 {
 121         __be32  nfserr;
 122
 123         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 124
 125         /* Read the symlink. */
 126         resp->len = NFS_MAXPATHLEN;
 127         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 128
 129         fh_put(&argp->fh);
 130         return nfserr;
 131 }
 132
 133 /*
 134  * Read a portion of a file.
 135  * N.B. After this call resp->fh needs an fh_put
 136  */
 137 static __be32
 138 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
 139                                        struct nfsd_readres  *resp)
 140 {
 141         __be32  nfserr;
 142
 143         dprintk("nfsd: READ    %s %d bytes at %d\n",
 144                 SVCFH_fmt(&argp->fh),
 145                 argp->count, argp->offset);
 146
 147         /* Obtain buffer pointer for payload. 19 is 1 word for
 148          * status, 17 words for fattr, and 1 word for the byte count.
 149          */
 150
 151         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 152                 char buf[RPC_MAX_ADDRBUFLEN];
 153                 printk(KERN_NOTICE
 154                         "oversized read request from %s (%d bytes)\n",
 155                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 156                                 argp->count);
 157                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 158         }
 159         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 160
 161         resp->count = argp->count;
 162         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 163                                   argp->offset,
 164                                   rqstp->rq_vec, argp->vlen,
 165                                   &resp->count);
 166
 167         if (nfserr) return nfserr;
 168         return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
 169                                     resp->fh.fh_dentry,
 170                                     &resp->stat));
 171 }
 172
 173 /*
 174  * Write data to a file
 175  * N.B. After this call resp->fh needs an fh_put
 176  */
 177 static __be32
 178 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 179                                         struct nfsd_attrstat  *resp)
 180 {
 181         __be32  nfserr;
 182         int     stable = 1;
 183         unsigned long cnt = argp->len;
 184
 185         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 186                 SVCFH_fmt(&argp->fh),
 187                 argp->len, argp->offset);
 188
 189         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 190                                    argp->offset,
 191                                    rqstp->rq_vec, argp->vlen,
 192                                    &cnt,
 193                                    &stable);
 194         return nfsd_return_attrs(nfserr, resp);
 195 }
 196
 197 /*
 198  * CREATE processing is complicated. The keyword here is `overloaded.'
 199  * The parent directory is kept locked between the check for existence
 200  * and the actual create() call in compliance with VFS protocols.
 201  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 202  */
 203 static __be32
 204 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 205                                          struct nfsd_diropres   *resp)
 206 {
 207         svc_fh          *dirfhp = &argp->fh;
 208         svc_fh          *newfhp = &resp->fh;
 209         struct iattr    *attr = &argp->attrs;
 210         struct inode    *inode;
 211         struct dentry   *dchild;
 212         int             type, mode;
 213         __be32          nfserr;
 214         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 215
 216         dprintk("nfsd: CREATE   %s %.*s\n",
 217                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 218
 219         /* First verify the parent file handle */
 220         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 221         if (nfserr)
 222                 goto done; /* must fh_put dirfhp even on error */
 223
 224         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 225
 226         nfserr = nfserr_acces;
 227         if (!argp->len)
 228                 goto done;
 229         nfserr = nfserr_exist;
 230         if (isdotent(argp->name, argp->len))
 231                 goto done;
 232         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 233         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 234         if (IS_ERR(dchild)) {
 235                 nfserr = nfserrno(PTR_ERR(dchild));
 236                 goto out_unlock;
 237         }
 238         fh_init(newfhp, NFS_FHSIZE);
 239         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 240         if (!nfserr && !dchild->d_inode)
 241                 nfserr = nfserr_noent;
 242         dput(dchild);
 243         if (nfserr) {
 244                 if (nfserr != nfserr_noent)
 245                         goto out_unlock;
 246                 /*
 247                  * If the new file handle wasn't verified, we can't tell
 248                  * whether the file exists or not. Time to bail ...
 249                  */
 250                 nfserr = nfserr_acces;
 251                 if (!newfhp->fh_dentry) {
 252                         printk(KERN_WARNING
 253                                 "nfsd_proc_create: file handle not verified\n");
 254                         goto out_unlock;
 255                 }
 256         }
 257
 258         inode = newfhp->fh_dentry->d_inode;
 259
 260         /* Unfudge the mode bits */
 261         if (attr->ia_valid & ATTR_MODE) {
 262                 type = attr->ia_mode & S_IFMT;
 263                 mode = attr->ia_mode & ~S_IFMT;
 264                 if (!type) {
 265                         /* no type, so if target exists, assume same as that,
 266                          * else assume a file */
 267                         if (inode) {
 268                                 type = inode->i_mode & S_IFMT;
 269                                 switch(type) {
 270                                 case S_IFCHR:
 271                                 case S_IFBLK:
 272                                         /* reserve rdev for later checking */
 273                                         rdev = inode->i_rdev;
 274                                         attr->ia_valid |= ATTR_SIZE;
 275
 276                                         /* FALLTHROUGH */
 277                                 case S_IFIFO:
 278                                         /* this is probably a permission check..
 279                                          * at least IRIX implements perm checking on
 280                                          *   echo thing > device-special-file-or-pipe
 281                                          * by doing a CREATE with type==0
 282                                          */
 283                                         nfserr = nfsd_permission(rqstp,
 284                                                                  newfhp->fh_export,
 285                                                                  newfhp->fh_dentry,
 286                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 287                                         if (nfserr && nfserr != nfserr_rofs)
 288                                                 goto out_unlock;
 289                                 }
 290                         } else
 291                                 type = S_IFREG;
 292                 }
 293         } else if (inode) {
 294                 type = inode->i_mode & S_IFMT;
 295                 mode = inode->i_mode & ~S_IFMT;
 296         } else {
 297                 type = S_IFREG;
 298                 mode = 0;       /* ??? */
 299         }
 300
 301         attr->ia_valid |= ATTR_MODE;
 302         attr->ia_mode = mode;
 303
 304         /* Special treatment for non-regular files according to the
 305          * gospel of sun micro
 306          */
 307         if (type != S_IFREG) {
 308                 int     is_borc = 0;
 309                 if (type != S_IFBLK && type != S_IFCHR) {
 310                         rdev = 0;
 311                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 312                         /* If you think you've seen the worst, grok this. */
 313                         type = S_IFIFO;
 314                 } else {
 315                         /* Okay, char or block special */
 316                         is_borc = 1;
 317                         if (!rdev)
 318                                 rdev = wanted;
 319                 }
 320
 321                 /* we've used the SIZE information, so discard it */
 322                 attr->ia_valid &= ~ATTR_SIZE;
 323
 324                 /* Make sure the type and device matches */
 325                 nfserr = nfserr_exist;
 326                 if (inode && type != (inode->i_mode & S_IFMT))
 327                         goto out_unlock;
 328         }
 329
 330         nfserr = 0;
 331         if (!inode) {
 332                 /* File doesn't exist. Create it and set attrs */
 333                 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 334                                         attr, type, rdev, newfhp);
 335         } else if (type == S_IFREG) {
 336                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 337                         argp->name, attr->ia_valid, (long) attr->ia_size);
 338                 /* File already exists. We ignore all attributes except
 339                  * size, so that creat() behaves exactly like
 340                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 341                  */
 342                 attr->ia_valid &= ATTR_SIZE;
 343                 if (attr->ia_valid)
 344                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 345         }
 346
 347 out_unlock:
 348         /* We don't really need to unlock, as fh_put does it. */
 349         fh_unlock(dirfhp);
 350
 351 done:
 352         fh_put(dirfhp);
 353         return nfsd_return_dirop(nfserr, resp);
 354 }
 355
 356 static __be32
 357 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 358                                          void                  *resp)
 359 {
 360         __be32  nfserr;
 361
 362         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 363                 argp->len, argp->name);
 364
 365         /* Unlink. -SIFDIR means file must not be a directory */
 366         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 367         fh_put(&argp->fh);
 368         return nfserr;
 369 }
 370
 371 static __be32
 372 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
 373                                          void                   *resp)
 374 {
 375         __be32  nfserr;
 376
 377         dprintk("nfsd: RENAME   %s %.*s -> \n",
 378                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 379         dprintk("nfsd:        ->  %s %.*s\n",
 380                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 381
 382         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 383                                     &argp->tfh, argp->tname, argp->tlen);
 384         fh_put(&argp->ffh);
 385         fh_put(&argp->tfh);
 386         return nfserr;
 387 }
 388
 389 static __be32
 390 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
 391                                 void                        *resp)
 392 {
 393         __be32  nfserr;
 394
 395         dprintk("nfsd: LINK     %s ->\n",
 396                 SVCFH_fmt(&argp->ffh));
 397         dprintk("nfsd:    %s %.*s\n",
 398                 SVCFH_fmt(&argp->tfh),
 399                 argp->tlen,
 400                 argp->tname);
 401
 402         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 403                                   &argp->ffh);
 404         fh_put(&argp->ffh);
 405         fh_put(&argp->tfh);
 406         return nfserr;
 407 }
 408
 409 static __be32
 410 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
 411                                           void                    *resp)
 412 {
 413         struct svc_fh   newfh;
 414         __be32          nfserr;
 415
 416         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 417                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 418                 argp->tlen, argp->tname);
 419
 420         fh_init(&newfh, NFS_FHSIZE);
 421         /*
 422          * Create the link, look up new file and set attrs.
 423          */
 424         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 425                                                  argp->tname, argp->tlen,
 426                                                  &newfh, &argp->attrs);
 427
 428
 429         fh_put(&argp->ffh);
 430         fh_put(&newfh);
 431         return nfserr;
 432 }
 433
 434 /*
 435  * Make directory. This operation is not idempotent.
 436  * N.B. After this call resp->fh needs an fh_put
 437  */
 438 static __be32
 439 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 440                                         struct nfsd_diropres   *resp)
 441 {
 442         __be32  nfserr;
 443
 444         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 445
 446         if (resp->fh.fh_dentry) {
 447                 printk(KERN_WARNING
 448                         "nfsd_proc_mkdir: response already verified??\n");
 449         }
 450
 451         argp->attrs.ia_valid &= ~ATTR_SIZE;
 452         fh_init(&resp->fh, NFS_FHSIZE);
 453         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 454                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 455         fh_put(&argp->fh);
 456         return nfsd_return_dirop(nfserr, resp);
 457 }
 458
 459 /*
 460  * Remove a directory
 461  */
 462 static __be32
 463 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 464                                         void                  *resp)
 465 {
 466         __be32  nfserr;
 467
 468         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 469
 470         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 471         fh_put(&argp->fh);
 472         return nfserr;
 473 }
 474
 475 /*
 476  * Read a portion of a directory.
 477  */
 478 static __be32
 479 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
 480                                           struct nfsd_readdirres  *resp)
 481 {
 482         int             count;
 483         __be32          nfserr;
 484         loff_t          offset;
 485
 486         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 487                 SVCFH_fmt(&argp->fh),
 488                 argp->count, argp->cookie);
 489
 490         /* Shrink to the client read size */
 491         count = (argp->count >> 2) - 2;
 492
 493         /* Make sure we've room for the NULL ptr & eof flag */
 494         count -= 2;
 495         if (count < 0)
 496                 count = 0;
 497
 498         resp->buffer = argp->buffer;
 499         resp->offset = NULL;
 500         resp->buflen = count;
 501         resp->common.err = nfs_ok;
 502         /* Read directory and encode entries on the fly */
 503         offset = argp->cookie;
 504         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 505                               &resp->common, nfssvc_encode_entry);
 506
 507         resp->count = resp->buffer - argp->buffer;
 508         if (resp->offset)
 509                 *resp->offset = htonl(offset);
 510
 511         fh_put(&argp->fh);
 512         return nfserr;
 513 }
 514
 515 /*
 516  * Get file system info
 517  */
 518 static __be32
 519 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
 520                                           struct nfsd_statfsres *resp)
 521 {
 522         __be32  nfserr;
 523
 524         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 525
 526         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 527                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 528         fh_put(&argp->fh);
 529         return nfserr;
 530 }
 531
 532 /*
 533  * NFSv2 Server procedures.
 534  * Only the results of non-idempotent operations are cached.
 535  */
 536 struct nfsd_void { int dummy; };
 537
 538 #define ST 1            /* status */
 539 #define FH 8            /* filehandle */
 540 #define AT 18           /* attributes */
 541
 542 static struct svc_procedure             nfsd_procedures2[18] = {
 543         [NFSPROC_NULL] = {
 544                 .pc_func = (svc_procfunc) nfsd_proc_null,
 545                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 546                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 547                 .pc_argsize = sizeof(struct nfsd_void),
 548                 .pc_ressize = sizeof(struct nfsd_void),
 549                 .pc_cachetype = RC_NOCACHE,
 550                 .pc_xdrressize = ST,
 551         },
 552         [NFSPROC_GETATTR] = {
 553                 .pc_func = (svc_procfunc) nfsd_proc_getattr,
 554                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 555                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 556                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 557                 .pc_argsize = sizeof(struct nfsd_fhandle),
 558                 .pc_ressize = sizeof(struct nfsd_attrstat),
 559                 .pc_cachetype = RC_NOCACHE,
 560                 .pc_xdrressize = ST+AT,
 561         },
 562         [NFSPROC_SETATTR] = {
 563                 .pc_func = (svc_procfunc) nfsd_proc_setattr,
 564                 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
 565                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 566                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 567                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 568                 .pc_ressize = sizeof(struct nfsd_attrstat),
 569                 .pc_cachetype = RC_REPLBUFF,
 570                 .pc_xdrressize = ST+AT,
 571         },
 572         [NFSPROC_ROOT] = {
 573                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 574                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 575                 .pc_argsize = sizeof(struct nfsd_void),
 576                 .pc_ressize = sizeof(struct nfsd_void),
 577                 .pc_cachetype = RC_NOCACHE,
 578                 .pc_xdrressize = ST,
 579         },
 580         [NFSPROC_LOOKUP] = {
 581                 .pc_func = (svc_procfunc) nfsd_proc_lookup,
 582                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 583                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 584                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 585                 .pc_argsize = sizeof(struct nfsd_diropargs),
 586                 .pc_ressize = sizeof(struct nfsd_diropres),
 587                 .pc_cachetype = RC_NOCACHE,
 588                 .pc_xdrressize = ST+FH+AT,
 589         },
 590         [NFSPROC_READLINK] = {
 591                 .pc_func = (svc_procfunc) nfsd_proc_readlink,
 592                 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
 593                 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
 594                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 595                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 596                 .pc_cachetype = RC_NOCACHE,
 597                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 598         },
 599         [NFSPROC_READ] = {
 600                 .pc_func = (svc_procfunc) nfsd_proc_read,
 601                 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
 602                 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
 603                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 604                 .pc_argsize = sizeof(struct nfsd_readargs),
 605                 .pc_ressize = sizeof(struct nfsd_readres),
 606                 .pc_cachetype = RC_NOCACHE,
 607                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 608         },
 609         [NFSPROC_WRITECACHE] = {
 610                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 611                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 612                 .pc_argsize = sizeof(struct nfsd_void),
 613                 .pc_ressize = sizeof(struct nfsd_void),
 614                 .pc_cachetype = RC_NOCACHE,
 615                 .pc_xdrressize = ST,
 616         },
 617         [NFSPROC_WRITE] = {
 618                 .pc_func = (svc_procfunc) nfsd_proc_write,
 619                 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
 620                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 621                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 622                 .pc_argsize = sizeof(struct nfsd_writeargs),
 623                 .pc_ressize = sizeof(struct nfsd_attrstat),
 624                 .pc_cachetype = RC_REPLBUFF,
 625                 .pc_xdrressize = ST+AT,
 626         },
 627         [NFSPROC_CREATE] = {
 628                 .pc_func = (svc_procfunc) nfsd_proc_create,
 629                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 630                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 631                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 632                 .pc_argsize = sizeof(struct nfsd_createargs),
 633                 .pc_ressize = sizeof(struct nfsd_diropres),
 634                 .pc_cachetype = RC_REPLBUFF,
 635                 .pc_xdrressize = ST+FH+AT,
 636         },
 637         [NFSPROC_REMOVE] = {
 638                 .pc_func = (svc_procfunc) nfsd_proc_remove,
 639                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 640                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 641                 .pc_argsize = sizeof(struct nfsd_diropargs),
 642                 .pc_ressize = sizeof(struct nfsd_void),
 643                 .pc_cachetype = RC_REPLSTAT,
 644                 .pc_xdrressize = ST,
 645         },
 646         [NFSPROC_RENAME] = {
 647                 .pc_func = (svc_procfunc) nfsd_proc_rename,
 648                 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
 649                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 650                 .pc_argsize = sizeof(struct nfsd_renameargs),
 651                 .pc_ressize = sizeof(struct nfsd_void),
 652                 .pc_cachetype = RC_REPLSTAT,
 653                 .pc_xdrressize = ST,
 654         },
 655         [NFSPROC_LINK] = {
 656                 .pc_func = (svc_procfunc) nfsd_proc_link,
 657                 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
 658                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 659                 .pc_argsize = sizeof(struct nfsd_linkargs),
 660                 .pc_ressize = sizeof(struct nfsd_void),
 661                 .pc_cachetype = RC_REPLSTAT,
 662                 .pc_xdrressize = ST,
 663         },
 664         [NFSPROC_SYMLINK] = {
 665                 .pc_func = (svc_procfunc) nfsd_proc_symlink,
 666                 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
 667                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 668                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 669                 .pc_ressize = sizeof(struct nfsd_void),
 670                 .pc_cachetype = RC_REPLSTAT,
 671                 .pc_xdrressize = ST,
 672         },
 673         [NFSPROC_MKDIR] = {
 674                 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
 675                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 676                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 677                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 678                 .pc_argsize = sizeof(struct nfsd_createargs),
 679                 .pc_ressize = sizeof(struct nfsd_diropres),
 680                 .pc_cachetype = RC_REPLBUFF,
 681                 .pc_xdrressize = ST+FH+AT,
 682         },
 683         [NFSPROC_RMDIR] = {
 684                 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
 685                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 686                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 687                 .pc_argsize = sizeof(struct nfsd_diropargs),
 688                 .pc_ressize = sizeof(struct nfsd_void),
 689                 .pc_cachetype = RC_REPLSTAT,
 690                 .pc_xdrressize = ST,
 691         },
 692         [NFSPROC_READDIR] = {
 693                 .pc_func = (svc_procfunc) nfsd_proc_readdir,
 694                 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
 695                 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
 696                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 697                 .pc_ressize = sizeof(struct nfsd_readdirres),
 698                 .pc_cachetype = RC_NOCACHE,
 699         },
 700         [NFSPROC_STATFS] = {
 701                 .pc_func = (svc_procfunc) nfsd_proc_statfs,
 702                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 703                 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
 704                 .pc_argsize = sizeof(struct nfsd_fhandle),
 705                 .pc_ressize = sizeof(struct nfsd_statfsres),
 706                 .pc_cachetype = RC_NOCACHE,
 707                 .pc_xdrressize = ST+5,
 708         },
 709 };
 710
 711
 712 struct svc_version      nfsd_version2 = {
 713                 .vs_vers        = 2,
 714                 .vs_nproc       = 18,
 715                 .vs_proc        = nfsd_procedures2,
 716                 .vs_dispatch    = nfsd_dispatch,
 717                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 718 };
 719
 720 /*
 721  * Map errnos to NFS errnos.
 722  */
 723 __be32
 724 nfserrno (int errno)
 725 {
 726         static struct {
 727                 __be32  nfserr;
 728                 int     syserr;
 729         } nfs_errtbl[] = {
 730                 { nfs_ok, 0 },
 731                 { nfserr_perm, -EPERM },
 732                 { nfserr_noent, -ENOENT },
 733                 { nfserr_io, -EIO },
 734                 { nfserr_nxio, -ENXIO },
 735                 { nfserr_acces, -EACCES },
 736                 { nfserr_exist, -EEXIST },
 737                 { nfserr_xdev, -EXDEV },
 738                 { nfserr_mlink, -EMLINK },
 739                 { nfserr_nodev, -ENODEV },
 740                 { nfserr_notdir, -ENOTDIR },
 741                 { nfserr_isdir, -EISDIR },
 742                 { nfserr_inval, -EINVAL },
 743                 { nfserr_fbig, -EFBIG },
 744                 { nfserr_nospc, -ENOSPC },
 745                 { nfserr_rofs, -EROFS },
 746                 { nfserr_mlink, -EMLINK },
 747                 { nfserr_nametoolong, -ENAMETOOLONG },
 748                 { nfserr_notempty, -ENOTEMPTY },
 749 #ifdef EDQUOT
 750                 { nfserr_dquot, -EDQUOT },
 751 #endif
 752                 { nfserr_stale, -ESTALE },
 753                 { nfserr_jukebox, -ETIMEDOUT },
 754                 { nfserr_jukebox, -ERESTARTSYS },
 755                 { nfserr_dropit, -EAGAIN },
 756                 { nfserr_dropit, -ENOMEM },
 757                 { nfserr_badname, -ESRCH },
 758                 { nfserr_io, -ETXTBSY },
 759                 { nfserr_notsupp, -EOPNOTSUPP },
 760                 { nfserr_toosmall, -ETOOSMALL },
 761         };
 762         int     i;
 763
 764         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 765                 if (nfs_errtbl[i].syserr == errno)
 766                         return nfs_errtbl[i].nfserr;
 767         }
 768         printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
 769         return nfserr_io;
 770 }
 771