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         struct iattr *iap = &argp->attrs;
  63         struct svc_fh *fhp;
  64         __be32 nfserr;
  65
  66         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  67                 SVCFH_fmt(&argp->fh),
  68                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  69
  70         fhp = fh_copy(&resp->fh, &argp->fh);
  71
  72         /*
  73          * NFSv2 does not differentiate between "set-[ac]time-to-now"
  74          * which only requires access, and "set-[ac]time-to-X" which
  75          * requires ownership.
  76          * So if it looks like it might be "set both to the same time which
  77          * is close to now", and if inode_change_ok fails, then we
  78          * convert to "set to now" instead of "set to explicit time"
  79          *
  80          * We only call inode_change_ok as the last test as technically
  81          * it is not an interface that we should be using.
  82          */
  83 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
  84 #define MAX_TOUCH_TIME_ERROR (30*60)
  85         if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
  86             iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
  87                 /*
  88                  * Looks probable.
  89                  *
  90                  * Now just make sure time is in the right ballpark.
  91                  * Solaris, at least, doesn't seem to care what the time
  92                  * request is.  We require it be within 30 minutes of now.
  93                  */
  94                 time_t delta = iap->ia_atime.tv_sec - get_seconds();
  95                 struct inode *inode;
  96
  97                 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
  98                 if (nfserr)
  99                         goto done;
 100                 inode = d_inode(fhp->fh_dentry);
 101
 102                 if (delta < 0)
 103                         delta = -delta;
 104                 if (delta < MAX_TOUCH_TIME_ERROR &&
 105                     inode_change_ok(inode, iap) != 0) {
 106                         /*
 107                          * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
 108                          * This will cause notify_change to set these times
 109                          * to "now"
 110                          */
 111                         iap->ia_valid &= ~BOTH_TIME_SET;
 112                 }
 113         }
 114
 115         nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
 116 done:
 117         return nfsd_return_attrs(nfserr, resp);
 118 }
 119
 120 /*
 121  * Look up a path name component
 122  * Note: the dentry in the resp->fh may be negative if the file
 123  * doesn't exist yet.
 124  * N.B. After this call resp->fh needs an fh_put
 125  */
 126 static __be32
 127 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 128                                          struct nfsd_diropres  *resp)
 129 {
 130         __be32  nfserr;
 131
 132         dprintk("nfsd: LOOKUP   %s %.*s\n",
 133                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 134
 135         fh_init(&resp->fh, NFS_FHSIZE);
 136         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 137                                  &resp->fh);
 138
 139         fh_put(&argp->fh);
 140         return nfsd_return_dirop(nfserr, resp);
 141 }
 142
 143 /*
 144  * Read a symlink.
 145  */
 146 static __be32
 147 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
 148                                            struct nfsd_readlinkres *resp)
 149 {
 150         __be32  nfserr;
 151
 152         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 153
 154         /* Read the symlink. */
 155         resp->len = NFS_MAXPATHLEN;
 156         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 157
 158         fh_put(&argp->fh);
 159         return nfserr;
 160 }
 161
 162 /*
 163  * Read a portion of a file.
 164  * N.B. After this call resp->fh needs an fh_put
 165  */
 166 static __be32
 167 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
 168                                        struct nfsd_readres  *resp)
 169 {
 170         __be32  nfserr;
 171
 172         dprintk("nfsd: READ    %s %d bytes at %d\n",
 173                 SVCFH_fmt(&argp->fh),
 174                 argp->count, argp->offset);
 175
 176         /* Obtain buffer pointer for payload. 19 is 1 word for
 177          * status, 17 words for fattr, and 1 word for the byte count.
 178          */
 179
 180         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 181                 char buf[RPC_MAX_ADDRBUFLEN];
 182                 printk(KERN_NOTICE
 183                         "oversized read request from %s (%d bytes)\n",
 184                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 185                                 argp->count);
 186                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 187         }
 188         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 189
 190         resp->count = argp->count;
 191         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 192                                   argp->offset,
 193                                   rqstp->rq_vec, argp->vlen,
 194                                   &resp->count);
 195
 196         if (nfserr) return nfserr;
 197         return fh_getattr(&resp->fh, &resp->stat);
 198 }
 199
 200 /*
 201  * Write data to a file
 202  * N.B. After this call resp->fh needs an fh_put
 203  */
 204 static __be32
 205 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 206                                         struct nfsd_attrstat  *resp)
 207 {
 208         __be32  nfserr;
 209         int     stable = 1;
 210         unsigned long cnt = argp->len;
 211
 212         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 213                 SVCFH_fmt(&argp->fh),
 214                 argp->len, argp->offset);
 215
 216         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
 217                                    argp->offset,
 218                                    rqstp->rq_vec, argp->vlen,
 219                                    &cnt,
 220                                    &stable);
 221         return nfsd_return_attrs(nfserr, resp);
 222 }
 223
 224 /*
 225  * CREATE processing is complicated. The keyword here is `overloaded.'
 226  * The parent directory is kept locked between the check for existence
 227  * and the actual create() call in compliance with VFS protocols.
 228  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 229  */
 230 static __be32
 231 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 232                                          struct nfsd_diropres   *resp)
 233 {
 234         svc_fh          *dirfhp = &argp->fh;
 235         svc_fh          *newfhp = &resp->fh;
 236         struct iattr    *attr = &argp->attrs;
 237         struct inode    *inode;
 238         struct dentry   *dchild;
 239         int             type, mode;
 240         __be32          nfserr;
 241         int             hosterr;
 242         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 243
 244         dprintk("nfsd: CREATE   %s %.*s\n",
 245                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 246
 247         /* First verify the parent file handle */
 248         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 249         if (nfserr)
 250                 goto done; /* must fh_put dirfhp even on error */
 251
 252         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 253
 254         nfserr = nfserr_exist;
 255         if (isdotent(argp->name, argp->len))
 256                 goto done;
 257         hosterr = fh_want_write(dirfhp);
 258         if (hosterr) {
 259                 nfserr = nfserrno(hosterr);
 260                 goto done;
 261         }
 262
 263         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 264         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 265         if (IS_ERR(dchild)) {
 266                 nfserr = nfserrno(PTR_ERR(dchild));
 267                 goto out_unlock;
 268         }
 269         fh_init(newfhp, NFS_FHSIZE);
 270         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 271         if (!nfserr && d_really_is_negative(dchild))
 272                 nfserr = nfserr_noent;
 273         dput(dchild);
 274         if (nfserr) {
 275                 if (nfserr != nfserr_noent)
 276                         goto out_unlock;
 277                 /*
 278                  * If the new file handle wasn't verified, we can't tell
 279                  * whether the file exists or not. Time to bail ...
 280                  */
 281                 nfserr = nfserr_acces;
 282                 if (!newfhp->fh_dentry) {
 283                         printk(KERN_WARNING
 284                                 "nfsd_proc_create: file handle not verified\n");
 285                         goto out_unlock;
 286                 }
 287         }
 288
 289         inode = d_inode(newfhp->fh_dentry);
 290
 291         /* Unfudge the mode bits */
 292         if (attr->ia_valid & ATTR_MODE) {
 293                 type = attr->ia_mode & S_IFMT;
 294                 mode = attr->ia_mode & ~S_IFMT;
 295                 if (!type) {
 296                         /* no type, so if target exists, assume same as that,
 297                          * else assume a file */
 298                         if (inode) {
 299                                 type = inode->i_mode & S_IFMT;
 300                                 switch(type) {
 301                                 case S_IFCHR:
 302                                 case S_IFBLK:
 303                                         /* reserve rdev for later checking */
 304                                         rdev = inode->i_rdev;
 305                                         attr->ia_valid |= ATTR_SIZE;
 306
 307                                         /* FALLTHROUGH */
 308                                 case S_IFIFO:
 309                                         /* this is probably a permission check..
 310                                          * at least IRIX implements perm checking on
 311                                          *   echo thing > device-special-file-or-pipe
 312                                          * by doing a CREATE with type==0
 313                                          */
 314                                         nfserr = nfsd_permission(rqstp,
 315                                                                  newfhp->fh_export,
 316                                                                  newfhp->fh_dentry,
 317                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 318                                         if (nfserr && nfserr != nfserr_rofs)
 319                                                 goto out_unlock;
 320                                 }
 321                         } else
 322                                 type = S_IFREG;
 323                 }
 324         } else if (inode) {
 325                 type = inode->i_mode & S_IFMT;
 326                 mode = inode->i_mode & ~S_IFMT;
 327         } else {
 328                 type = S_IFREG;
 329                 mode = 0;       /* ??? */
 330         }
 331
 332         attr->ia_valid |= ATTR_MODE;
 333         attr->ia_mode = mode;
 334
 335         /* Special treatment for non-regular files according to the
 336          * gospel of sun micro
 337          */
 338         if (type != S_IFREG) {
 339                 if (type != S_IFBLK && type != S_IFCHR) {
 340                         rdev = 0;
 341                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 342                         /* If you think you've seen the worst, grok this. */
 343                         type = S_IFIFO;
 344                 } else {
 345                         /* Okay, char or block special */
 346                         if (!rdev)
 347                                 rdev = wanted;
 348                 }
 349
 350                 /* we've used the SIZE information, so discard it */
 351                 attr->ia_valid &= ~ATTR_SIZE;
 352
 353                 /* Make sure the type and device matches */
 354                 nfserr = nfserr_exist;
 355                 if (inode && type != (inode->i_mode & S_IFMT))
 356                         goto out_unlock;
 357         }
 358
 359         nfserr = 0;
 360         if (!inode) {
 361                 /* File doesn't exist. Create it and set attrs */
 362                 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
 363                                         argp->len, attr, type, rdev, newfhp);
 364         } else if (type == S_IFREG) {
 365                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 366                         argp->name, attr->ia_valid, (long) attr->ia_size);
 367                 /* File already exists. We ignore all attributes except
 368                  * size, so that creat() behaves exactly like
 369                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 370                  */
 371                 attr->ia_valid &= ATTR_SIZE;
 372                 if (attr->ia_valid)
 373                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 374         }
 375
 376 out_unlock:
 377         /* We don't really need to unlock, as fh_put does it. */
 378         fh_unlock(dirfhp);
 379         fh_drop_write(dirfhp);
 380 done:
 381         fh_put(dirfhp);
 382         return nfsd_return_dirop(nfserr, resp);
 383 }
 384
 385 static __be32
 386 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 387                                          void                  *resp)
 388 {
 389         __be32  nfserr;
 390
 391         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 392                 argp->len, argp->name);
 393
 394         /* Unlink. -SIFDIR means file must not be a directory */
 395         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 396         fh_put(&argp->fh);
 397         return nfserr;
 398 }
 399
 400 static __be32
 401 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
 402                                          void                   *resp)
 403 {
 404         __be32  nfserr;
 405
 406         dprintk("nfsd: RENAME   %s %.*s -> \n",
 407                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 408         dprintk("nfsd:        ->  %s %.*s\n",
 409                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 410
 411         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 412                                     &argp->tfh, argp->tname, argp->tlen);
 413         fh_put(&argp->ffh);
 414         fh_put(&argp->tfh);
 415         return nfserr;
 416 }
 417
 418 static __be32
 419 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
 420                                 void                        *resp)
 421 {
 422         __be32  nfserr;
 423
 424         dprintk("nfsd: LINK     %s ->\n",
 425                 SVCFH_fmt(&argp->ffh));
 426         dprintk("nfsd:    %s %.*s\n",
 427                 SVCFH_fmt(&argp->tfh),
 428                 argp->tlen,
 429                 argp->tname);
 430
 431         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 432                                   &argp->ffh);
 433         fh_put(&argp->ffh);
 434         fh_put(&argp->tfh);
 435         return nfserr;
 436 }
 437
 438 static __be32
 439 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
 440                                           void                    *resp)
 441 {
 442         struct svc_fh   newfh;
 443         __be32          nfserr;
 444
 445         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 446                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 447                 argp->tlen, argp->tname);
 448
 449         fh_init(&newfh, NFS_FHSIZE);
 450         /*
 451          * Crazy hack: the request fits in a page, and already-decoded
 452          * attributes follow argp->tname, so it's safe to just write a
 453          * null to ensure it's null-terminated:
 454          */
 455         argp->tname[argp->tlen] = '\0';
 456         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 457                                                  argp->tname, &newfh);
 458
 459         fh_put(&argp->ffh);
 460         fh_put(&newfh);
 461         return nfserr;
 462 }
 463
 464 /*
 465  * Make directory. This operation is not idempotent.
 466  * N.B. After this call resp->fh needs an fh_put
 467  */
 468 static __be32
 469 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 470                                         struct nfsd_diropres   *resp)
 471 {
 472         __be32  nfserr;
 473
 474         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 475
 476         if (resp->fh.fh_dentry) {
 477                 printk(KERN_WARNING
 478                         "nfsd_proc_mkdir: response already verified??\n");
 479         }
 480
 481         argp->attrs.ia_valid &= ~ATTR_SIZE;
 482         fh_init(&resp->fh, NFS_FHSIZE);
 483         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 484                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 485         fh_put(&argp->fh);
 486         return nfsd_return_dirop(nfserr, resp);
 487 }
 488
 489 /*
 490  * Remove a directory
 491  */
 492 static __be32
 493 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 494                                         void                  *resp)
 495 {
 496         __be32  nfserr;
 497
 498         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 499
 500         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 501         fh_put(&argp->fh);
 502         return nfserr;
 503 }
 504
 505 /*
 506  * Read a portion of a directory.
 507  */
 508 static __be32
 509 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
 510                                           struct nfsd_readdirres  *resp)
 511 {
 512         int             count;
 513         __be32          nfserr;
 514         loff_t          offset;
 515
 516         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 517                 SVCFH_fmt(&argp->fh),
 518                 argp->count, argp->cookie);
 519
 520         /* Shrink to the client read size */
 521         count = (argp->count >> 2) - 2;
 522
 523         /* Make sure we've room for the NULL ptr & eof flag */
 524         count -= 2;
 525         if (count < 0)
 526                 count = 0;
 527
 528         resp->buffer = argp->buffer;
 529         resp->offset = NULL;
 530         resp->buflen = count;
 531         resp->common.err = nfs_ok;
 532         /* Read directory and encode entries on the fly */
 533         offset = argp->cookie;
 534         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 535                               &resp->common, nfssvc_encode_entry);
 536
 537         resp->count = resp->buffer - argp->buffer;
 538         if (resp->offset)
 539                 *resp->offset = htonl(offset);
 540
 541         fh_put(&argp->fh);
 542         return nfserr;
 543 }
 544
 545 /*
 546  * Get file system info
 547  */
 548 static __be32
 549 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
 550                                           struct nfsd_statfsres *resp)
 551 {
 552         __be32  nfserr;
 553
 554         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 555
 556         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 557                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 558         fh_put(&argp->fh);
 559         return nfserr;
 560 }
 561
 562 /*
 563  * NFSv2 Server procedures.
 564  * Only the results of non-idempotent operations are cached.
 565  */
 566 struct nfsd_void { int dummy; };
 567
 568 #define ST 1            /* status */
 569 #define FH 8            /* filehandle */
 570 #define AT 18           /* attributes */
 571
 572 static struct svc_procedure             nfsd_procedures2[18] = {
 573         [NFSPROC_NULL] = {
 574                 .pc_func = (svc_procfunc) nfsd_proc_null,
 575                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 576                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 577                 .pc_argsize = sizeof(struct nfsd_void),
 578                 .pc_ressize = sizeof(struct nfsd_void),
 579                 .pc_cachetype = RC_NOCACHE,
 580                 .pc_xdrressize = ST,
 581         },
 582         [NFSPROC_GETATTR] = {
 583                 .pc_func = (svc_procfunc) nfsd_proc_getattr,
 584                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 585                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 586                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 587                 .pc_argsize = sizeof(struct nfsd_fhandle),
 588                 .pc_ressize = sizeof(struct nfsd_attrstat),
 589                 .pc_cachetype = RC_NOCACHE,
 590                 .pc_xdrressize = ST+AT,
 591         },
 592         [NFSPROC_SETATTR] = {
 593                 .pc_func = (svc_procfunc) nfsd_proc_setattr,
 594                 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
 595                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 596                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 597                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 598                 .pc_ressize = sizeof(struct nfsd_attrstat),
 599                 .pc_cachetype = RC_REPLBUFF,
 600                 .pc_xdrressize = ST+AT,
 601         },
 602         [NFSPROC_ROOT] = {
 603                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 604                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 605                 .pc_argsize = sizeof(struct nfsd_void),
 606                 .pc_ressize = sizeof(struct nfsd_void),
 607                 .pc_cachetype = RC_NOCACHE,
 608                 .pc_xdrressize = ST,
 609         },
 610         [NFSPROC_LOOKUP] = {
 611                 .pc_func = (svc_procfunc) nfsd_proc_lookup,
 612                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 613                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 614                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 615                 .pc_argsize = sizeof(struct nfsd_diropargs),
 616                 .pc_ressize = sizeof(struct nfsd_diropres),
 617                 .pc_cachetype = RC_NOCACHE,
 618                 .pc_xdrressize = ST+FH+AT,
 619         },
 620         [NFSPROC_READLINK] = {
 621                 .pc_func = (svc_procfunc) nfsd_proc_readlink,
 622                 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
 623                 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
 624                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 625                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 626                 .pc_cachetype = RC_NOCACHE,
 627                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 628         },
 629         [NFSPROC_READ] = {
 630                 .pc_func = (svc_procfunc) nfsd_proc_read,
 631                 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
 632                 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
 633                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 634                 .pc_argsize = sizeof(struct nfsd_readargs),
 635                 .pc_ressize = sizeof(struct nfsd_readres),
 636                 .pc_cachetype = RC_NOCACHE,
 637                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 638         },
 639         [NFSPROC_WRITECACHE] = {
 640                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 641                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 642                 .pc_argsize = sizeof(struct nfsd_void),
 643                 .pc_ressize = sizeof(struct nfsd_void),
 644                 .pc_cachetype = RC_NOCACHE,
 645                 .pc_xdrressize = ST,
 646         },
 647         [NFSPROC_WRITE] = {
 648                 .pc_func = (svc_procfunc) nfsd_proc_write,
 649                 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
 650                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 651                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 652                 .pc_argsize = sizeof(struct nfsd_writeargs),
 653                 .pc_ressize = sizeof(struct nfsd_attrstat),
 654                 .pc_cachetype = RC_REPLBUFF,
 655                 .pc_xdrressize = ST+AT,
 656         },
 657         [NFSPROC_CREATE] = {
 658                 .pc_func = (svc_procfunc) nfsd_proc_create,
 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_REMOVE] = {
 668                 .pc_func = (svc_procfunc) nfsd_proc_remove,
 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_RENAME] = {
 677                 .pc_func = (svc_procfunc) nfsd_proc_rename,
 678                 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
 679                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 680                 .pc_argsize = sizeof(struct nfsd_renameargs),
 681                 .pc_ressize = sizeof(struct nfsd_void),
 682                 .pc_cachetype = RC_REPLSTAT,
 683                 .pc_xdrressize = ST,
 684         },
 685         [NFSPROC_LINK] = {
 686                 .pc_func = (svc_procfunc) nfsd_proc_link,
 687                 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
 688                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 689                 .pc_argsize = sizeof(struct nfsd_linkargs),
 690                 .pc_ressize = sizeof(struct nfsd_void),
 691                 .pc_cachetype = RC_REPLSTAT,
 692                 .pc_xdrressize = ST,
 693         },
 694         [NFSPROC_SYMLINK] = {
 695                 .pc_func = (svc_procfunc) nfsd_proc_symlink,
 696                 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
 697                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 698                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 699                 .pc_ressize = sizeof(struct nfsd_void),
 700                 .pc_cachetype = RC_REPLSTAT,
 701                 .pc_xdrressize = ST,
 702         },
 703         [NFSPROC_MKDIR] = {
 704                 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
 705                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 706                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 707                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 708                 .pc_argsize = sizeof(struct nfsd_createargs),
 709                 .pc_ressize = sizeof(struct nfsd_diropres),
 710                 .pc_cachetype = RC_REPLBUFF,
 711                 .pc_xdrressize = ST+FH+AT,
 712         },
 713         [NFSPROC_RMDIR] = {
 714                 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
 715                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 716                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 717                 .pc_argsize = sizeof(struct nfsd_diropargs),
 718                 .pc_ressize = sizeof(struct nfsd_void),
 719                 .pc_cachetype = RC_REPLSTAT,
 720                 .pc_xdrressize = ST,
 721         },
 722         [NFSPROC_READDIR] = {
 723                 .pc_func = (svc_procfunc) nfsd_proc_readdir,
 724                 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
 725                 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
 726                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 727                 .pc_ressize = sizeof(struct nfsd_readdirres),
 728                 .pc_cachetype = RC_NOCACHE,
 729         },
 730         [NFSPROC_STATFS] = {
 731                 .pc_func = (svc_procfunc) nfsd_proc_statfs,
 732                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 733                 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
 734                 .pc_argsize = sizeof(struct nfsd_fhandle),
 735                 .pc_ressize = sizeof(struct nfsd_statfsres),
 736                 .pc_cachetype = RC_NOCACHE,
 737                 .pc_xdrressize = ST+5,
 738         },
 739 };
 740
 741
 742 struct svc_version      nfsd_version2 = {
 743                 .vs_vers        = 2,
 744                 .vs_nproc       = 18,
 745                 .vs_proc        = nfsd_procedures2,
 746                 .vs_dispatch    = nfsd_dispatch,
 747                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 748 };
 749
 750 /*
 751  * Map errnos to NFS errnos.
 752  */
 753 __be32
 754 nfserrno (int errno)
 755 {
 756         static struct {
 757                 __be32  nfserr;
 758                 int     syserr;
 759         } nfs_errtbl[] = {
 760                 { nfs_ok, 0 },
 761                 { nfserr_perm, -EPERM },
 762                 { nfserr_noent, -ENOENT },
 763                 { nfserr_io, -EIO },
 764                 { nfserr_nxio, -ENXIO },
 765                 { nfserr_fbig, -E2BIG },
 766                 { nfserr_acces, -EACCES },
 767                 { nfserr_exist, -EEXIST },
 768                 { nfserr_xdev, -EXDEV },
 769                 { nfserr_mlink, -EMLINK },
 770                 { nfserr_nodev, -ENODEV },
 771                 { nfserr_notdir, -ENOTDIR },
 772                 { nfserr_isdir, -EISDIR },
 773                 { nfserr_inval, -EINVAL },
 774                 { nfserr_fbig, -EFBIG },
 775                 { nfserr_nospc, -ENOSPC },
 776                 { nfserr_rofs, -EROFS },
 777                 { nfserr_mlink, -EMLINK },
 778                 { nfserr_nametoolong, -ENAMETOOLONG },
 779                 { nfserr_notempty, -ENOTEMPTY },
 780 #ifdef EDQUOT
 781                 { nfserr_dquot, -EDQUOT },
 782 #endif
 783                 { nfserr_stale, -ESTALE },
 784                 { nfserr_jukebox, -ETIMEDOUT },
 785                 { nfserr_jukebox, -ERESTARTSYS },
 786                 { nfserr_jukebox, -EAGAIN },
 787                 { nfserr_jukebox, -EWOULDBLOCK },
 788                 { nfserr_jukebox, -ENOMEM },
 789                 { nfserr_io, -ETXTBSY },
 790                 { nfserr_notsupp, -EOPNOTSUPP },
 791                 { nfserr_toosmall, -ETOOSMALL },
 792                 { nfserr_serverfault, -ESERVERFAULT },
 793                 { nfserr_serverfault, -ENFILE },
 794         };
 795         int     i;
 796
 797         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 798                 if (nfs_errtbl[i].syserr == errno)
 799                         return nfs_errtbl[i].nfserr;
 800         }
 801         WARN(1, "nfsd: non-standard errno: %d\n", errno);
 802         return nfserr_io;
 803 }
 804