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