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 nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
  30                                     resp->fh.fh_dentry,
  31                                     &resp->stat));
  32 }
  33 static __be32
  34 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
  35 {
  36         if (err) return err;
  37         return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
  38                                     resp->fh.fh_dentry,
  39                                     &resp->stat));
  40 }
  41 /*
  42  * Get a file's attributes
  43  * N.B. After this call resp->fh needs an fh_put
  44  */
  45 static __be32
  46 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
  47                                           struct nfsd_attrstat *resp)
  48 {
  49         __be32 nfserr;
  50         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  51
  52         fh_copy(&resp->fh, &argp->fh);
  53         nfserr = fh_verify(rqstp, &resp->fh, 0,
  54                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  55         return nfsd_return_attrs(nfserr, resp);
  56 }
  57
  58 /*
  59  * Set a file's attributes
  60  * N.B. After this call resp->fh needs an fh_put
  61  */
  62 static __be32
  63 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
  64                                           struct nfsd_attrstat  *resp)
  65 {
  66         __be32 nfserr;
  67         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  68                 SVCFH_fmt(&argp->fh),
  69                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  70
  71         fh_copy(&resp->fh, &argp->fh);
  72         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
  73         return nfsd_return_attrs(nfserr, resp);
  74 }
  75
  76 /*
  77  * Look up a path name component
  78  * Note: the dentry in the resp->fh may be negative if the file
  79  * doesn't exist yet.
  80  * N.B. After this call resp->fh needs an fh_put
  81  */
  82 static __be32
  83 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
  84                                          struct nfsd_diropres  *resp)
  85 {
  86         __be32  nfserr;
  87
  88         dprintk("nfsd: LOOKUP   %s %.*s\n",
  89                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
  90
  91         fh_init(&resp->fh, NFS_FHSIZE);
  92         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
  93                                  &resp->fh);
  94
  95         fh_put(&argp->fh);
  96         return nfsd_return_dirop(nfserr, resp);
  97 }
  98
  99 /*
 100  * Read a symlink.
 101  */
 102 static __be32
 103 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
 104                                            struct nfsd_readlinkres *resp)
 105 {
 106         __be32  nfserr;
 107
 108         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 109
 110         /* Read the symlink. */
 111         resp->len = NFS_MAXPATHLEN;
 112         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 113
 114         fh_put(&argp->fh);
 115         return nfserr;
 116 }
 117
 118 /*
 119  * Read a portion of a file.
 120  * N.B. After this call resp->fh needs an fh_put
 121  */
 122 static __be32
 123 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
 124                                        struct nfsd_readres  *resp)
 125 {
 126         __be32  nfserr;
 127
 128         dprintk("nfsd: READ    %s %d bytes at %d\n",
 129                 SVCFH_fmt(&argp->fh),
 130                 argp->count, argp->offset);
 131
 132         /* Obtain buffer pointer for payload. 19 is 1 word for
 133          * status, 17 words for fattr, and 1 word for the byte count.
 134          */
 135
 136         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 137                 char buf[RPC_MAX_ADDRBUFLEN];
 138                 printk(KERN_NOTICE
 139                         "oversized read request from %s (%d bytes)\n",
 140                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 141                                 argp->count);
 142                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 143         }
 144         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 145
 146         resp->count = argp->count;
 147         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 148                                   argp->offset,
 149                                   rqstp->rq_vec, argp->vlen,
 150                                   &resp->count);
 151
 152         if (nfserr) return nfserr;
 153         return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
 154                                     resp->fh.fh_dentry,
 155                                     &resp->stat));
 156 }
 157
 158 /*
 159  * Write data to a file
 160  * N.B. After this call resp->fh needs an fh_put
 161  */
 162 static __be32
 163 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 164                                         struct nfsd_attrstat  *resp)
 165 {
 166         __be32  nfserr;
 167         int     stable = 1;
 168         unsigned long cnt = argp->len;
 169
 170         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 171                 SVCFH_fmt(&argp->fh),
 172                 argp->len, argp->offset);
 173
 174         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 175                                    argp->offset,
 176                                    rqstp->rq_vec, argp->vlen,
 177                                    &cnt,
 178                                    &stable);
 179         return nfsd_return_attrs(nfserr, resp);
 180 }
 181
 182 /*
 183  * CREATE processing is complicated. The keyword here is `overloaded.'
 184  * The parent directory is kept locked between the check for existence
 185  * and the actual create() call in compliance with VFS protocols.
 186  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 187  */
 188 static __be32
 189 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 190                                          struct nfsd_diropres   *resp)
 191 {
 192         svc_fh          *dirfhp = &argp->fh;
 193         svc_fh          *newfhp = &resp->fh;
 194         struct iattr    *attr = &argp->attrs;
 195         struct inode    *inode;
 196         struct dentry   *dchild;
 197         int             type, mode;
 198         __be32          nfserr;
 199         int             hosterr;
 200         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 201
 202         dprintk("nfsd: CREATE   %s %.*s\n",
 203                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 204
 205         /* First verify the parent file handle */
 206         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 207         if (nfserr)
 208                 goto done; /* must fh_put dirfhp even on error */
 209
 210         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 211
 212         nfserr = nfserr_acces;
 213         if (!argp->len)
 214                 goto done;
 215         nfserr = nfserr_exist;
 216         if (isdotent(argp->name, argp->len))
 217                 goto done;
 218         hosterr = fh_want_write(dirfhp);
 219         if (hosterr) {
 220                 nfserr = nfserrno(hosterr);
 221                 goto done;
 222         }
 223
 224         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 225         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 226         if (IS_ERR(dchild)) {
 227                 nfserr = nfserrno(PTR_ERR(dchild));
 228                 goto out_unlock;
 229         }
 230         fh_init(newfhp, NFS_FHSIZE);
 231         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 232         if (!nfserr && !dchild->d_inode)
 233                 nfserr = nfserr_noent;
 234         dput(dchild);
 235         if (nfserr) {
 236                 if (nfserr != nfserr_noent)
 237                         goto out_unlock;
 238                 /*
 239                  * If the new file handle wasn't verified, we can't tell
 240                  * whether the file exists or not. Time to bail ...
 241                  */
 242                 nfserr = nfserr_acces;
 243                 if (!newfhp->fh_dentry) {
 244                         printk(KERN_WARNING
 245                                 "nfsd_proc_create: file handle not verified\n");
 246                         goto out_unlock;
 247                 }
 248         }
 249
 250         inode = newfhp->fh_dentry->d_inode;
 251
 252         /* Unfudge the mode bits */
 253         if (attr->ia_valid & ATTR_MODE) {
 254                 type = attr->ia_mode & S_IFMT;
 255                 mode = attr->ia_mode & ~S_IFMT;
 256                 if (!type) {
 257                         /* no type, so if target exists, assume same as that,
 258                          * else assume a file */
 259                         if (inode) {
 260                                 type = inode->i_mode & S_IFMT;
 261                                 switch(type) {
 262                                 case S_IFCHR:
 263                                 case S_IFBLK:
 264                                         /* reserve rdev for later checking */
 265                                         rdev = inode->i_rdev;
 266                                         attr->ia_valid |= ATTR_SIZE;
 267
 268                                         /* FALLTHROUGH */
 269                                 case S_IFIFO:
 270                                         /* this is probably a permission check..
 271                                          * at least IRIX implements perm checking on
 272                                          *   echo thing > device-special-file-or-pipe
 273                                          * by doing a CREATE with type==0
 274                                          */
 275                                         nfserr = nfsd_permission(rqstp,
 276                                                                  newfhp->fh_export,
 277                                                                  newfhp->fh_dentry,
 278                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 279                                         if (nfserr && nfserr != nfserr_rofs)
 280                                                 goto out_unlock;
 281                                 }
 282                         } else
 283                                 type = S_IFREG;
 284                 }
 285         } else if (inode) {
 286                 type = inode->i_mode & S_IFMT;
 287                 mode = inode->i_mode & ~S_IFMT;
 288         } else {
 289                 type = S_IFREG;
 290                 mode = 0;       /* ??? */
 291         }
 292
 293         attr->ia_valid |= ATTR_MODE;
 294         attr->ia_mode = mode;
 295
 296         /* Special treatment for non-regular files according to the
 297          * gospel of sun micro
 298          */
 299         if (type != S_IFREG) {
 300                 if (type != S_IFBLK && type != S_IFCHR) {
 301                         rdev = 0;
 302                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 303                         /* If you think you've seen the worst, grok this. */
 304                         type = S_IFIFO;
 305                 } else {
 306                         /* Okay, char or block special */
 307                         if (!rdev)
 308                                 rdev = wanted;
 309                 }
 310
 311                 /* we've used the SIZE information, so discard it */
 312                 attr->ia_valid &= ~ATTR_SIZE;
 313
 314                 /* Make sure the type and device matches */
 315                 nfserr = nfserr_exist;
 316                 if (inode && type != (inode->i_mode & S_IFMT))
 317                         goto out_unlock;
 318         }
 319
 320         nfserr = 0;
 321         if (!inode) {
 322                 /* File doesn't exist. Create it and set attrs */
 323                 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 324                                         attr, type, rdev, newfhp);
 325         } else if (type == S_IFREG) {
 326                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 327                         argp->name, attr->ia_valid, (long) attr->ia_size);
 328                 /* File already exists. We ignore all attributes except
 329                  * size, so that creat() behaves exactly like
 330                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 331                  */
 332                 attr->ia_valid &= ATTR_SIZE;
 333                 if (attr->ia_valid)
 334                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 335         }
 336
 337 out_unlock:
 338         /* We don't really need to unlock, as fh_put does it. */
 339         fh_unlock(dirfhp);
 340         fh_drop_write(dirfhp);
 341 done:
 342         fh_put(dirfhp);
 343         return nfsd_return_dirop(nfserr, resp);
 344 }
 345
 346 static __be32
 347 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 348                                          void                  *resp)
 349 {
 350         __be32  nfserr;
 351
 352         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 353                 argp->len, argp->name);
 354
 355         /* Unlink. -SIFDIR means file must not be a directory */
 356         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 357         fh_put(&argp->fh);
 358         return nfserr;
 359 }
 360
 361 static __be32
 362 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
 363                                          void                   *resp)
 364 {
 365         __be32  nfserr;
 366
 367         dprintk("nfsd: RENAME   %s %.*s -> \n",
 368                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 369         dprintk("nfsd:        ->  %s %.*s\n",
 370                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 371
 372         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 373                                     &argp->tfh, argp->tname, argp->tlen);
 374         fh_put(&argp->ffh);
 375         fh_put(&argp->tfh);
 376         return nfserr;
 377 }
 378
 379 static __be32
 380 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
 381                                 void                        *resp)
 382 {
 383         __be32  nfserr;
 384
 385         dprintk("nfsd: LINK     %s ->\n",
 386                 SVCFH_fmt(&argp->ffh));
 387         dprintk("nfsd:    %s %.*s\n",
 388                 SVCFH_fmt(&argp->tfh),
 389                 argp->tlen,
 390                 argp->tname);
 391
 392         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 393                                   &argp->ffh);
 394         fh_put(&argp->ffh);
 395         fh_put(&argp->tfh);
 396         return nfserr;
 397 }
 398
 399 static __be32
 400 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
 401                                           void                    *resp)
 402 {
 403         struct svc_fh   newfh;
 404         __be32          nfserr;
 405
 406         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 407                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 408                 argp->tlen, argp->tname);
 409
 410         fh_init(&newfh, NFS_FHSIZE);
 411         /*
 412          * Create the link, look up new file and set attrs.
 413          */
 414         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 415                                                  argp->tname, argp->tlen,
 416                                                  &newfh, &argp->attrs);
 417
 418
 419         fh_put(&argp->ffh);
 420         fh_put(&newfh);
 421         return nfserr;
 422 }
 423
 424 /*
 425  * Make directory. This operation is not idempotent.
 426  * N.B. After this call resp->fh needs an fh_put
 427  */
 428 static __be32
 429 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 430                                         struct nfsd_diropres   *resp)
 431 {
 432         __be32  nfserr;
 433
 434         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 435
 436         if (resp->fh.fh_dentry) {
 437                 printk(KERN_WARNING
 438                         "nfsd_proc_mkdir: response already verified??\n");
 439         }
 440
 441         argp->attrs.ia_valid &= ~ATTR_SIZE;
 442         fh_init(&resp->fh, NFS_FHSIZE);
 443         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 444                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 445         fh_put(&argp->fh);
 446         return nfsd_return_dirop(nfserr, resp);
 447 }
 448
 449 /*
 450  * Remove a directory
 451  */
 452 static __be32
 453 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 454                                         void                  *resp)
 455 {
 456         __be32  nfserr;
 457
 458         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 459
 460         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 461         fh_put(&argp->fh);
 462         return nfserr;
 463 }
 464
 465 /*
 466  * Read a portion of a directory.
 467  */
 468 static __be32
 469 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
 470                                           struct nfsd_readdirres  *resp)
 471 {
 472         int             count;
 473         __be32          nfserr;
 474         loff_t          offset;
 475
 476         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 477                 SVCFH_fmt(&argp->fh),
 478                 argp->count, argp->cookie);
 479
 480         /* Shrink to the client read size */
 481         count = (argp->count >> 2) - 2;
 482
 483         /* Make sure we've room for the NULL ptr & eof flag */
 484         count -= 2;
 485         if (count < 0)
 486                 count = 0;
 487
 488         resp->buffer = argp->buffer;
 489         resp->offset = NULL;
 490         resp->buflen = count;
 491         resp->common.err = nfs_ok;
 492         /* Read directory and encode entries on the fly */
 493         offset = argp->cookie;
 494         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 495                               &resp->common, nfssvc_encode_entry);
 496
 497         resp->count = resp->buffer - argp->buffer;
 498         if (resp->offset)
 499                 *resp->offset = htonl(offset);
 500
 501         fh_put(&argp->fh);
 502         return nfserr;
 503 }
 504
 505 /*
 506  * Get file system info
 507  */
 508 static __be32
 509 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
 510                                           struct nfsd_statfsres *resp)
 511 {
 512         __be32  nfserr;
 513
 514         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 515
 516         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 517                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 518         fh_put(&argp->fh);
 519         return nfserr;
 520 }
 521
 522 /*
 523  * NFSv2 Server procedures.
 524  * Only the results of non-idempotent operations are cached.
 525  */
 526 struct nfsd_void { int dummy; };
 527
 528 #define ST 1            /* status */
 529 #define FH 8            /* filehandle */
 530 #define AT 18           /* attributes */
 531
 532 static struct svc_procedure             nfsd_procedures2[18] = {
 533         [NFSPROC_NULL] = {
 534                 .pc_func = (svc_procfunc) nfsd_proc_null,
 535                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 536                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 537                 .pc_argsize = sizeof(struct nfsd_void),
 538                 .pc_ressize = sizeof(struct nfsd_void),
 539                 .pc_cachetype = RC_NOCACHE,
 540                 .pc_xdrressize = ST,
 541         },
 542         [NFSPROC_GETATTR] = {
 543                 .pc_func = (svc_procfunc) nfsd_proc_getattr,
 544                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 545                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 546                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 547                 .pc_argsize = sizeof(struct nfsd_fhandle),
 548                 .pc_ressize = sizeof(struct nfsd_attrstat),
 549                 .pc_cachetype = RC_NOCACHE,
 550                 .pc_xdrressize = ST+AT,
 551         },
 552         [NFSPROC_SETATTR] = {
 553                 .pc_func = (svc_procfunc) nfsd_proc_setattr,
 554                 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
 555                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 556                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 557                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 558                 .pc_ressize = sizeof(struct nfsd_attrstat),
 559                 .pc_cachetype = RC_REPLBUFF,
 560                 .pc_xdrressize = ST+AT,
 561         },
 562         [NFSPROC_ROOT] = {
 563                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 564                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 565                 .pc_argsize = sizeof(struct nfsd_void),
 566                 .pc_ressize = sizeof(struct nfsd_void),
 567                 .pc_cachetype = RC_NOCACHE,
 568                 .pc_xdrressize = ST,
 569         },
 570         [NFSPROC_LOOKUP] = {
 571                 .pc_func = (svc_procfunc) nfsd_proc_lookup,
 572                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 573                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 574                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 575                 .pc_argsize = sizeof(struct nfsd_diropargs),
 576                 .pc_ressize = sizeof(struct nfsd_diropres),
 577                 .pc_cachetype = RC_NOCACHE,
 578                 .pc_xdrressize = ST+FH+AT,
 579         },
 580         [NFSPROC_READLINK] = {
 581                 .pc_func = (svc_procfunc) nfsd_proc_readlink,
 582                 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
 583                 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
 584                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 585                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 586                 .pc_cachetype = RC_NOCACHE,
 587                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 588         },
 589         [NFSPROC_READ] = {
 590                 .pc_func = (svc_procfunc) nfsd_proc_read,
 591                 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
 592                 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
 593                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 594                 .pc_argsize = sizeof(struct nfsd_readargs),
 595                 .pc_ressize = sizeof(struct nfsd_readres),
 596                 .pc_cachetype = RC_NOCACHE,
 597                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 598         },
 599         [NFSPROC_WRITECACHE] = {
 600                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 601                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 602                 .pc_argsize = sizeof(struct nfsd_void),
 603                 .pc_ressize = sizeof(struct nfsd_void),
 604                 .pc_cachetype = RC_NOCACHE,
 605                 .pc_xdrressize = ST,
 606         },
 607         [NFSPROC_WRITE] = {
 608                 .pc_func = (svc_procfunc) nfsd_proc_write,
 609                 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
 610                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 611                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 612                 .pc_argsize = sizeof(struct nfsd_writeargs),
 613                 .pc_ressize = sizeof(struct nfsd_attrstat),
 614                 .pc_cachetype = RC_REPLBUFF,
 615                 .pc_xdrressize = ST+AT,
 616         },
 617         [NFSPROC_CREATE] = {
 618                 .pc_func = (svc_procfunc) nfsd_proc_create,
 619                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 620                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 621                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 622                 .pc_argsize = sizeof(struct nfsd_createargs),
 623                 .pc_ressize = sizeof(struct nfsd_diropres),
 624                 .pc_cachetype = RC_REPLBUFF,
 625                 .pc_xdrressize = ST+FH+AT,
 626         },
 627         [NFSPROC_REMOVE] = {
 628                 .pc_func = (svc_procfunc) nfsd_proc_remove,
 629                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 630                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 631                 .pc_argsize = sizeof(struct nfsd_diropargs),
 632                 .pc_ressize = sizeof(struct nfsd_void),
 633                 .pc_cachetype = RC_REPLSTAT,
 634                 .pc_xdrressize = ST,
 635         },
 636         [NFSPROC_RENAME] = {
 637                 .pc_func = (svc_procfunc) nfsd_proc_rename,
 638                 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
 639                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 640                 .pc_argsize = sizeof(struct nfsd_renameargs),
 641                 .pc_ressize = sizeof(struct nfsd_void),
 642                 .pc_cachetype = RC_REPLSTAT,
 643                 .pc_xdrressize = ST,
 644         },
 645         [NFSPROC_LINK] = {
 646                 .pc_func = (svc_procfunc) nfsd_proc_link,
 647                 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
 648                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 649                 .pc_argsize = sizeof(struct nfsd_linkargs),
 650                 .pc_ressize = sizeof(struct nfsd_void),
 651                 .pc_cachetype = RC_REPLSTAT,
 652                 .pc_xdrressize = ST,
 653         },
 654         [NFSPROC_SYMLINK] = {
 655                 .pc_func = (svc_procfunc) nfsd_proc_symlink,
 656                 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
 657                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 658                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 659                 .pc_ressize = sizeof(struct nfsd_void),
 660                 .pc_cachetype = RC_REPLSTAT,
 661                 .pc_xdrressize = ST,
 662         },
 663         [NFSPROC_MKDIR] = {
 664                 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
 665                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 666                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 667                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 668                 .pc_argsize = sizeof(struct nfsd_createargs),
 669                 .pc_ressize = sizeof(struct nfsd_diropres),
 670                 .pc_cachetype = RC_REPLBUFF,
 671                 .pc_xdrressize = ST+FH+AT,
 672         },
 673         [NFSPROC_RMDIR] = {
 674                 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
 675                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 676                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 677                 .pc_argsize = sizeof(struct nfsd_diropargs),
 678                 .pc_ressize = sizeof(struct nfsd_void),
 679                 .pc_cachetype = RC_REPLSTAT,
 680                 .pc_xdrressize = ST,
 681         },
 682         [NFSPROC_READDIR] = {
 683                 .pc_func = (svc_procfunc) nfsd_proc_readdir,
 684                 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
 685                 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
 686                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 687                 .pc_ressize = sizeof(struct nfsd_readdirres),
 688                 .pc_cachetype = RC_NOCACHE,
 689         },
 690         [NFSPROC_STATFS] = {
 691                 .pc_func = (svc_procfunc) nfsd_proc_statfs,
 692                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 693                 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
 694                 .pc_argsize = sizeof(struct nfsd_fhandle),
 695                 .pc_ressize = sizeof(struct nfsd_statfsres),
 696                 .pc_cachetype = RC_NOCACHE,
 697                 .pc_xdrressize = ST+5,
 698         },
 699 };
 700
 701
 702 struct svc_version      nfsd_version2 = {
 703                 .vs_vers        = 2,
 704                 .vs_nproc       = 18,
 705                 .vs_proc        = nfsd_procedures2,
 706                 .vs_dispatch    = nfsd_dispatch,
 707                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 708 };
 709
 710 /*
 711  * Map errnos to NFS errnos.
 712  */
 713 __be32
 714 nfserrno (int errno)
 715 {
 716         static struct {
 717                 __be32  nfserr;
 718                 int     syserr;
 719         } nfs_errtbl[] = {
 720                 { nfs_ok, 0 },
 721                 { nfserr_perm, -EPERM },
 722                 { nfserr_noent, -ENOENT },
 723                 { nfserr_io, -EIO },
 724                 { nfserr_nxio, -ENXIO },
 725                 { nfserr_acces, -EACCES },
 726                 { nfserr_exist, -EEXIST },
 727                 { nfserr_xdev, -EXDEV },
 728                 { nfserr_mlink, -EMLINK },
 729                 { nfserr_nodev, -ENODEV },
 730                 { nfserr_notdir, -ENOTDIR },
 731                 { nfserr_isdir, -EISDIR },
 732                 { nfserr_inval, -EINVAL },
 733                 { nfserr_fbig, -EFBIG },
 734                 { nfserr_nospc, -ENOSPC },
 735                 { nfserr_rofs, -EROFS },
 736                 { nfserr_mlink, -EMLINK },
 737                 { nfserr_nametoolong, -ENAMETOOLONG },
 738                 { nfserr_notempty, -ENOTEMPTY },
 739 #ifdef EDQUOT
 740                 { nfserr_dquot, -EDQUOT },
 741 #endif
 742                 { nfserr_stale, -ESTALE },
 743                 { nfserr_jukebox, -ETIMEDOUT },
 744                 { nfserr_jukebox, -ERESTARTSYS },
 745                 { nfserr_jukebox, -EAGAIN },
 746                 { nfserr_jukebox, -EWOULDBLOCK },
 747                 { nfserr_jukebox, -ENOMEM },
 748                 { nfserr_io, -ETXTBSY },
 749                 { nfserr_notsupp, -EOPNOTSUPP },
 750                 { nfserr_toosmall, -ETOOSMALL },
 751                 { nfserr_serverfault, -ESERVERFAULT },
 752         };
 753         int     i;
 754
 755         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 756                 if (nfs_errtbl[i].syserr == errno)
 757                         return nfs_errtbl[i].nfserr;
 758         }
 759         printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
 760         return nfserr_io;
 761 }
 762