fs/nfsd/nfsproc.c

   1 /*
   2  * Process version 2 NFS requests.
   3  *
   4  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #include <linux/namei.h>
   8
   9 #include "cache.h"
  10 #include "xdr.h"
  11 #include "vfs.h"
  12
  13 typedef struct svc_rqst svc_rqst;
  14 typedef struct svc_buf  svc_buf;
  15
  16 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  17
  18
  19 static __be32
  20 nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  21 {
  22         return nfs_ok;
  23 }
  24
  25 static __be32
  26 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
  27 {
  28         if (err) return err;
  29         return fh_getattr(&resp->fh, &resp->stat);
  30 }
  31 static __be32
  32 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
  33 {
  34         if (err) return err;
  35         return fh_getattr(&resp->fh, &resp->stat);
  36 }
  37 /*
  38  * Get a file's attributes
  39  * N.B. After this call resp->fh needs an fh_put
  40  */
  41 static __be32
  42 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
  43                                           struct nfsd_attrstat *resp)
  44 {
  45         __be32 nfserr;
  46         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  47
  48         fh_copy(&resp->fh, &argp->fh);
  49         nfserr = fh_verify(rqstp, &resp->fh, 0,
  50                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  51         return nfsd_return_attrs(nfserr, resp);
  52 }
  53
  54 /*
  55  * Set a file's attributes
  56  * N.B. After this call resp->fh needs an fh_put
  57  */
  58 static __be32
  59 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
  60                                           struct nfsd_attrstat  *resp)
  61 {
  62         __be32 nfserr;
  63         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  64                 SVCFH_fmt(&argp->fh),
  65                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  66
  67         fh_copy(&resp->fh, &argp->fh);
  68         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
  69         return nfsd_return_attrs(nfserr, resp);
  70 }
  71
  72 /*
  73  * Look up a path name component
  74  * Note: the dentry in the resp->fh may be negative if the file
  75  * doesn't exist yet.
  76  * N.B. After this call resp->fh needs an fh_put
  77  */
  78 static __be32
  79 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
  80                                          struct nfsd_diropres  *resp)
  81 {
  82         __be32  nfserr;
  83
  84         dprintk("nfsd: LOOKUP   %s %.*s\n",
  85                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
  86
  87         fh_init(&resp->fh, NFS_FHSIZE);
  88         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
  89                                  &resp->fh);
  90
  91         fh_put(&argp->fh);
  92         return nfsd_return_dirop(nfserr, resp);
  93 }
  94
  95 /*
  96  * Read a symlink.
  97  */
  98 static __be32
  99 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
 100                                            struct nfsd_readlinkres *resp)
 101 {
 102         __be32  nfserr;
 103
 104         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 105
 106         /* Read the symlink. */
 107         resp->len = NFS_MAXPATHLEN;
 108         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 109
 110         fh_put(&argp->fh);
 111         return nfserr;
 112 }
 113
 114 /*
 115  * Read a portion of a file.
 116  * N.B. After this call resp->fh needs an fh_put
 117  */
 118 static __be32
 119 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
 120                                        struct nfsd_readres  *resp)
 121 {
 122         __be32  nfserr;
 123
 124         dprintk("nfsd: READ    %s %d bytes at %d\n",
 125                 SVCFH_fmt(&argp->fh),
 126                 argp->count, argp->offset);
 127
 128         /* Obtain buffer pointer for payload. 19 is 1 word for
 129          * status, 17 words for fattr, and 1 word for the byte count.
 130          */
 131
 132         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 133                 char buf[RPC_MAX_ADDRBUFLEN];
 134                 printk(KERN_NOTICE
 135                         "oversized read request from %s (%d bytes)\n",
 136                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 137                                 argp->count);
 138                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 139         }
 140         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 141
 142         resp->count = argp->count;
 143         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 144                                   argp->offset,
 145                                   rqstp->rq_vec, argp->vlen,
 146                                   &resp->count);
 147
 148         if (nfserr) return nfserr;
 149         return fh_getattr(&resp->fh, &resp->stat);
 150 }
 151
 152 /*
 153  * Write data to a file
 154  * N.B. After this call resp->fh needs an fh_put
 155  */
 156 static __be32
 157 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 158                                         struct nfsd_attrstat  *resp)
 159 {
 160         __be32  nfserr;
 161         int     stable = 1;
 162         unsigned long cnt = argp->len;
 163
 164         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 165                 SVCFH_fmt(&argp->fh),
 166                 argp->len, argp->offset);
 167
 168         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 169                                    argp->offset,
 170                                    rqstp->rq_vec, argp->vlen,
 171                                    &cnt,
 172                                    &stable);
 173         return nfsd_return_attrs(nfserr, resp);
 174 }
 175
 176 /*
 177  * CREATE processing is complicated. The keyword here is `overloaded.'
 178  * The parent directory is kept locked between the check for existence
 179  * and the actual create() call in compliance with VFS protocols.
 180  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 181  */
 182 static __be32
 183 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 184                                          struct nfsd_diropres   *resp)
 185 {
 186         svc_fh          *dirfhp = &argp->fh;
 187         svc_fh          *newfhp = &resp->fh;
 188         struct iattr    *attr = &argp->attrs;
 189         struct inode    *inode;
 190         struct dentry   *dchild;
 191         int             type, mode;
 192         __be32          nfserr;
 193         int             hosterr;
 194         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 195
 196         dprintk("nfsd: CREATE   %s %.*s\n",
 197                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 198
 199         /* First verify the parent file handle */
 200         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 201         if (nfserr)
 202                 goto done; /* must fh_put dirfhp even on error */
 203
 204         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 205
 206         nfserr = nfserr_acces;
 207         if (!argp->len)
 208                 goto done;
 209         nfserr = nfserr_exist;
 210         if (isdotent(argp->name, argp->len))
 211                 goto done;
 212         hosterr = fh_want_write(dirfhp);
 213         if (hosterr) {
 214                 nfserr = nfserrno(hosterr);
 215                 goto done;
 216         }
 217
 218         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 219         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 220         if (IS_ERR(dchild)) {
 221                 nfserr = nfserrno(PTR_ERR(dchild));
 222                 goto out_unlock;
 223         }
 224         fh_init(newfhp, NFS_FHSIZE);
 225         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 226         if (!nfserr && !dchild->d_inode)
 227                 nfserr = nfserr_noent;
 228         dput(dchild);
 229         if (nfserr) {
 230                 if (nfserr != nfserr_noent)
 231                         goto out_unlock;
 232                 /*
 233                  * If the new file handle wasn't verified, we can't tell
 234                  * whether the file exists or not. Time to bail ...
 235                  */
 236                 nfserr = nfserr_acces;
 237                 if (!newfhp->fh_dentry) {
 238                         printk(KERN_WARNING
 239                                 "nfsd_proc_create: file handle not verified\n");
 240                         goto out_unlock;
 241                 }
 242         }
 243
 244         inode = newfhp->fh_dentry->d_inode;
 245
 246         /* Unfudge the mode bits */
 247         if (attr->ia_valid & ATTR_MODE) {
 248                 type = attr->ia_mode & S_IFMT;
 249                 mode = attr->ia_mode & ~S_IFMT;
 250                 if (!type) {
 251                         /* no type, so if target exists, assume same as that,
 252                          * else assume a file */
 253                         if (inode) {
 254                                 type = inode->i_mode & S_IFMT;
 255                                 switch(type) {
 256                                 case S_IFCHR:
 257                                 case S_IFBLK:
 258                                         /* reserve rdev for later checking */
 259                                         rdev = inode->i_rdev;
 260                                         attr->ia_valid |= ATTR_SIZE;
 261
 262                                         /* FALLTHROUGH */
 263                                 case S_IFIFO:
 264                                         /* this is probably a permission check..
 265                                          * at least IRIX implements perm checking on
 266                                          *   echo thing > device-special-file-or-pipe
 267                                          * by doing a CREATE with type==0
 268                                          */
 269                                         nfserr = nfsd_permission(rqstp,
 270                                                                  newfhp->fh_export,
 271                                                                  newfhp->fh_dentry,
 272                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 273                                         if (nfserr && nfserr != nfserr_rofs)
 274                                                 goto out_unlock;
 275                                 }
 276                         } else
 277                                 type = S_IFREG;
 278                 }
 279         } else if (inode) {
 280                 type = inode->i_mode & S_IFMT;
 281                 mode = inode->i_mode & ~S_IFMT;
 282         } else {
 283                 type = S_IFREG;
 284                 mode = 0;       /* ??? */
 285         }
 286
 287         attr->ia_valid |= ATTR_MODE;
 288         attr->ia_mode = mode;
 289
 290         /* Special treatment for non-regular files according to the
 291          * gospel of sun micro
 292          */
 293         if (type != S_IFREG) {
 294                 if (type != S_IFBLK && type != S_IFCHR) {
 295                         rdev = 0;
 296                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 297                         /* If you think you've seen the worst, grok this. */
 298                         type = S_IFIFO;
 299                 } else {
 300                         /* Okay, char or block special */
 301                         if (!rdev)
 302                                 rdev = wanted;
 303                 }
 304
 305                 /* we've used the SIZE information, so discard it */
 306                 attr->ia_valid &= ~ATTR_SIZE;
 307
 308                 /* Make sure the type and device matches */
 309                 nfserr = nfserr_exist;
 310                 if (inode && type != (inode->i_mode & S_IFMT))
 311                         goto out_unlock;
 312         }
 313
 314         nfserr = 0;
 315         if (!inode) {
 316                 /* File doesn't exist. Create it and set attrs */
 317                 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 318                                         attr, type, rdev, newfhp);
 319         } else if (type == S_IFREG) {
 320                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 321                         argp->name, attr->ia_valid, (long) attr->ia_size);
 322                 /* File already exists. We ignore all attributes except
 323                  * size, so that creat() behaves exactly like
 324                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 325                  */
 326                 attr->ia_valid &= ATTR_SIZE;
 327                 if (attr->ia_valid)
 328                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 329         }
 330
 331 out_unlock:
 332         /* We don't really need to unlock, as fh_put does it. */
 333         fh_unlock(dirfhp);
 334         fh_drop_write(dirfhp);
 335 done:
 336         fh_put(dirfhp);
 337         return nfsd_return_dirop(nfserr, resp);
 338 }
 339
 340 static __be32
 341 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 342                                          void                  *resp)
 343 {
 344         __be32  nfserr;
 345
 346         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 347                 argp->len, argp->name);
 348
 349         /* Unlink. -SIFDIR means file must not be a directory */
 350         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 351         fh_put(&argp->fh);
 352         return nfserr;
 353 }
 354
 355 static __be32
 356 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
 357                                          void                   *resp)
 358 {
 359         __be32  nfserr;
 360
 361         dprintk("nfsd: RENAME   %s %.*s -> \n",
 362                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 363         dprintk("nfsd:        ->  %s %.*s\n",
 364                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 365
 366         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 367                                     &argp->tfh, argp->tname, argp->tlen);
 368         fh_put(&argp->ffh);
 369         fh_put(&argp->tfh);
 370         return nfserr;
 371 }
 372
 373 static __be32
 374 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
 375                                 void                        *resp)
 376 {
 377         __be32  nfserr;
 378
 379         dprintk("nfsd: LINK     %s ->\n",
 380                 SVCFH_fmt(&argp->ffh));
 381         dprintk("nfsd:    %s %.*s\n",
 382                 SVCFH_fmt(&argp->tfh),
 383                 argp->tlen,
 384                 argp->tname);
 385
 386         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 387                                   &argp->ffh);
 388         fh_put(&argp->ffh);
 389         fh_put(&argp->tfh);
 390         return nfserr;
 391 }
 392
 393 static __be32
 394 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
 395                                           void                    *resp)
 396 {
 397         struct svc_fh   newfh;
 398         __be32          nfserr;
 399
 400         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 401                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 402                 argp->tlen, argp->tname);
 403
 404         fh_init(&newfh, NFS_FHSIZE);
 405         /*
 406          * Create the link, look up new file and set attrs.
 407          */
 408         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 409                                                  argp->tname, argp->tlen,
 410                                                  &newfh, &argp->attrs);
 411
 412
 413         fh_put(&argp->ffh);
 414         fh_put(&newfh);
 415         return nfserr;
 416 }
 417
 418 /*
 419  * Make directory. This operation is not idempotent.
 420  * N.B. After this call resp->fh needs an fh_put
 421  */
 422 static __be32
 423 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 424                                         struct nfsd_diropres   *resp)
 425 {
 426         __be32  nfserr;
 427
 428         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 429
 430         if (resp->fh.fh_dentry) {
 431                 printk(KERN_WARNING
 432                         "nfsd_proc_mkdir: response already verified??\n");
 433         }
 434
 435         argp->attrs.ia_valid &= ~ATTR_SIZE;
 436         fh_init(&resp->fh, NFS_FHSIZE);
 437         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 438                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 439         fh_put(&argp->fh);
 440         return nfsd_return_dirop(nfserr, resp);
 441 }
 442
 443 /*
 444  * Remove a directory
 445  */
 446 static __be32
 447 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 448                                         void                  *resp)
 449 {
 450         __be32  nfserr;
 451
 452         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 453
 454         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 455         fh_put(&argp->fh);
 456         return nfserr;
 457 }
 458
 459 /*
 460  * Read a portion of a directory.
 461  */
 462 static __be32
 463 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
 464                                           struct nfsd_readdirres  *resp)
 465 {
 466         int             count;
 467         __be32          nfserr;
 468         loff_t          offset;
 469
 470         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 471                 SVCFH_fmt(&argp->fh),
 472                 argp->count, argp->cookie);
 473
 474         /* Shrink to the client read size */
 475         count = (argp->count >> 2) - 2;
 476
 477         /* Make sure we've room for the NULL ptr & eof flag */
 478         count -= 2;
 479         if (count < 0)
 480                 count = 0;
 481
 482         resp->buffer = argp->buffer;
 483         resp->offset = NULL;
 484         resp->buflen = count;
 485         resp->common.err = nfs_ok;
 486         /* Read directory and encode entries on the fly */
 487         offset = argp->cookie;
 488         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 489                               &resp->common, nfssvc_encode_entry);
 490
 491         resp->count = resp->buffer - argp->buffer;
 492         if (resp->offset)
 493                 *resp->offset = htonl(offset);
 494
 495         fh_put(&argp->fh);
 496         return nfserr;
 497 }
 498
 499 /*
 500  * Get file system info
 501  */
 502 static __be32
 503 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
 504                                           struct nfsd_statfsres *resp)
 505 {
 506         __be32  nfserr;
 507
 508         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 509
 510         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 511                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 512         fh_put(&argp->fh);
 513         return nfserr;
 514 }
 515
 516 /*
 517  * NFSv2 Server procedures.
 518  * Only the results of non-idempotent operations are cached.
 519  */
 520 struct nfsd_void { int dummy; };
 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         [NFSPROC_NULL] = {
 528                 .pc_func = (svc_procfunc) nfsd_proc_null,
 529                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 530                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 531                 .pc_argsize = sizeof(struct nfsd_void),
 532                 .pc_ressize = sizeof(struct nfsd_void),
 533                 .pc_cachetype = RC_NOCACHE,
 534                 .pc_xdrressize = ST,
 535         },
 536         [NFSPROC_GETATTR] = {
 537                 .pc_func = (svc_procfunc) nfsd_proc_getattr,
 538                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 539                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 540                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 541                 .pc_argsize = sizeof(struct nfsd_fhandle),
 542                 .pc_ressize = sizeof(struct nfsd_attrstat),
 543                 .pc_cachetype = RC_NOCACHE,
 544                 .pc_xdrressize = ST+AT,
 545         },
 546         [NFSPROC_SETATTR] = {
 547                 .pc_func = (svc_procfunc) nfsd_proc_setattr,
 548                 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
 549                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 550                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 551                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 552                 .pc_ressize = sizeof(struct nfsd_attrstat),
 553                 .pc_cachetype = RC_REPLBUFF,
 554                 .pc_xdrressize = ST+AT,
 555         },
 556         [NFSPROC_ROOT] = {
 557                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 558                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 559                 .pc_argsize = sizeof(struct nfsd_void),
 560                 .pc_ressize = sizeof(struct nfsd_void),
 561                 .pc_cachetype = RC_NOCACHE,
 562                 .pc_xdrressize = ST,
 563         },
 564         [NFSPROC_LOOKUP] = {
 565                 .pc_func = (svc_procfunc) nfsd_proc_lookup,
 566                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 567                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 568                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 569                 .pc_argsize = sizeof(struct nfsd_diropargs),
 570                 .pc_ressize = sizeof(struct nfsd_diropres),
 571                 .pc_cachetype = RC_NOCACHE,
 572                 .pc_xdrressize = ST+FH+AT,
 573         },
 574         [NFSPROC_READLINK] = {
 575                 .pc_func = (svc_procfunc) nfsd_proc_readlink,
 576                 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
 577                 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
 578                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 579                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 580                 .pc_cachetype = RC_NOCACHE,
 581                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 582         },
 583         [NFSPROC_READ] = {
 584                 .pc_func = (svc_procfunc) nfsd_proc_read,
 585                 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
 586                 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
 587                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 588                 .pc_argsize = sizeof(struct nfsd_readargs),
 589                 .pc_ressize = sizeof(struct nfsd_readres),
 590                 .pc_cachetype = RC_NOCACHE,
 591                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 592         },
 593         [NFSPROC_WRITECACHE] = {
 594                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 595                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 596                 .pc_argsize = sizeof(struct nfsd_void),
 597                 .pc_ressize = sizeof(struct nfsd_void),
 598                 .pc_cachetype = RC_NOCACHE,
 599                 .pc_xdrressize = ST,
 600         },
 601         [NFSPROC_WRITE] = {
 602                 .pc_func = (svc_procfunc) nfsd_proc_write,
 603                 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
 604                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 605                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 606                 .pc_argsize = sizeof(struct nfsd_writeargs),
 607                 .pc_ressize = sizeof(struct nfsd_attrstat),
 608                 .pc_cachetype = RC_REPLBUFF,
 609                 .pc_xdrressize = ST+AT,
 610         },
 611         [NFSPROC_CREATE] = {
 612                 .pc_func = (svc_procfunc) nfsd_proc_create,
 613                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 614                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 615                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 616                 .pc_argsize = sizeof(struct nfsd_createargs),
 617                 .pc_ressize = sizeof(struct nfsd_diropres),
 618                 .pc_cachetype = RC_REPLBUFF,
 619                 .pc_xdrressize = ST+FH+AT,
 620         },
 621         [NFSPROC_REMOVE] = {
 622                 .pc_func = (svc_procfunc) nfsd_proc_remove,
 623                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 624                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 625                 .pc_argsize = sizeof(struct nfsd_diropargs),
 626                 .pc_ressize = sizeof(struct nfsd_void),
 627                 .pc_cachetype = RC_REPLSTAT,
 628                 .pc_xdrressize = ST,
 629         },
 630         [NFSPROC_RENAME] = {
 631                 .pc_func = (svc_procfunc) nfsd_proc_rename,
 632                 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
 633                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 634                 .pc_argsize = sizeof(struct nfsd_renameargs),
 635                 .pc_ressize = sizeof(struct nfsd_void),
 636                 .pc_cachetype = RC_REPLSTAT,
 637                 .pc_xdrressize = ST,
 638         },
 639         [NFSPROC_LINK] = {
 640                 .pc_func = (svc_procfunc) nfsd_proc_link,
 641                 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
 642                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 643                 .pc_argsize = sizeof(struct nfsd_linkargs),
 644                 .pc_ressize = sizeof(struct nfsd_void),
 645                 .pc_cachetype = RC_REPLSTAT,
 646                 .pc_xdrressize = ST,
 647         },
 648         [NFSPROC_SYMLINK] = {
 649                 .pc_func = (svc_procfunc) nfsd_proc_symlink,
 650                 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
 651                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 652                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 653                 .pc_ressize = sizeof(struct nfsd_void),
 654                 .pc_cachetype = RC_REPLSTAT,
 655                 .pc_xdrressize = ST,
 656         },
 657         [NFSPROC_MKDIR] = {
 658                 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
 659                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 660                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 661                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 662                 .pc_argsize = sizeof(struct nfsd_createargs),
 663                 .pc_ressize = sizeof(struct nfsd_diropres),
 664                 .pc_cachetype = RC_REPLBUFF,
 665                 .pc_xdrressize = ST+FH+AT,
 666         },
 667         [NFSPROC_RMDIR] = {
 668                 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
 669                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 670                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 671                 .pc_argsize = sizeof(struct nfsd_diropargs),
 672                 .pc_ressize = sizeof(struct nfsd_void),
 673                 .pc_cachetype = RC_REPLSTAT,
 674                 .pc_xdrressize = ST,
 675         },
 676         [NFSPROC_READDIR] = {
 677                 .pc_func = (svc_procfunc) nfsd_proc_readdir,
 678                 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
 679                 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
 680                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 681                 .pc_ressize = sizeof(struct nfsd_readdirres),
 682                 .pc_cachetype = RC_NOCACHE,
 683         },
 684         [NFSPROC_STATFS] = {
 685                 .pc_func = (svc_procfunc) nfsd_proc_statfs,
 686                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 687                 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
 688                 .pc_argsize = sizeof(struct nfsd_fhandle),
 689                 .pc_ressize = sizeof(struct nfsd_statfsres),
 690                 .pc_cachetype = RC_NOCACHE,
 691                 .pc_xdrressize = ST+5,
 692         },
 693 };
 694
 695
 696 struct svc_version      nfsd_version2 = {
 697                 .vs_vers        = 2,
 698                 .vs_nproc       = 18,
 699                 .vs_proc        = nfsd_procedures2,
 700                 .vs_dispatch    = nfsd_dispatch,
 701                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 702 };
 703
 704 /*
 705  * Map errnos to NFS errnos.
 706  */
 707 __be32
 708 nfserrno (int errno)
 709 {
 710         static struct {
 711                 __be32  nfserr;
 712                 int     syserr;
 713         } nfs_errtbl[] = {
 714                 { nfs_ok, 0 },
 715                 { nfserr_perm, -EPERM },
 716                 { nfserr_noent, -ENOENT },
 717                 { nfserr_io, -EIO },
 718                 { nfserr_nxio, -ENXIO },
 719                 { nfserr_acces, -EACCES },
 720                 { nfserr_exist, -EEXIST },
 721                 { nfserr_xdev, -EXDEV },
 722                 { nfserr_mlink, -EMLINK },
 723                 { nfserr_nodev, -ENODEV },
 724                 { nfserr_notdir, -ENOTDIR },
 725                 { nfserr_isdir, -EISDIR },
 726                 { nfserr_inval, -EINVAL },
 727                 { nfserr_fbig, -EFBIG },
 728                 { nfserr_nospc, -ENOSPC },
 729                 { nfserr_rofs, -EROFS },
 730                 { nfserr_mlink, -EMLINK },
 731                 { nfserr_nametoolong, -ENAMETOOLONG },
 732                 { nfserr_notempty, -ENOTEMPTY },
 733 #ifdef EDQUOT
 734                 { nfserr_dquot, -EDQUOT },
 735 #endif
 736                 { nfserr_stale, -ESTALE },
 737                 { nfserr_jukebox, -ETIMEDOUT },
 738                 { nfserr_jukebox, -ERESTARTSYS },
 739                 { nfserr_jukebox, -EAGAIN },
 740                 { nfserr_jukebox, -EWOULDBLOCK },
 741                 { nfserr_jukebox, -ENOMEM },
 742                 { nfserr_io, -ETXTBSY },
 743                 { nfserr_notsupp, -EOPNOTSUPP },
 744                 { nfserr_toosmall, -ETOOSMALL },
 745                 { nfserr_serverfault, -ESERVERFAULT },
 746         };
 747         int     i;
 748
 749         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 750                 if (nfs_errtbl[i].syserr == errno)
 751                         return nfs_errtbl[i].nfserr;
 752         }
 753         printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
 754         return nfserr_io;
 755 }
 756