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 setattr_prepare fails, then we
  78          * convert to "set to now" instead of "set to explicit time"
  79          *
  80          * We only call setattr_prepare 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
  96                 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
  97                 if (nfserr)
  98                         goto done;
  99
 100                 if (delta < 0)
 101                         delta = -delta;
 102                 if (delta < MAX_TOUCH_TIME_ERROR &&
 103                     setattr_prepare(fhp->fh_dentry, iap) != 0) {
 104                         /*
 105                          * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
 106                          * This will cause notify_change to set these times
 107                          * to "now"
 108                          */
 109                         iap->ia_valid &= ~BOTH_TIME_SET;
 110                 }
 111         }
 112
 113         nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
 114 done:
 115         return nfsd_return_attrs(nfserr, resp);
 116 }
 117
 118 /*
 119  * Look up a path name component
 120  * Note: the dentry in the resp->fh may be negative if the file
 121  * doesn't exist yet.
 122  * N.B. After this call resp->fh needs an fh_put
 123  */
 124 static __be32
 125 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 126                                          struct nfsd_diropres  *resp)
 127 {
 128         __be32  nfserr;
 129
 130         dprintk("nfsd: LOOKUP   %s %.*s\n",
 131                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 132
 133         fh_init(&resp->fh, NFS_FHSIZE);
 134         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 135                                  &resp->fh);
 136
 137         fh_put(&argp->fh);
 138         return nfsd_return_dirop(nfserr, resp);
 139 }
 140
 141 /*
 142  * Read a symlink.
 143  */
 144 static __be32
 145 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
 146                                            struct nfsd_readlinkres *resp)
 147 {
 148         __be32  nfserr;
 149
 150         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 151
 152         /* Read the symlink. */
 153         resp->len = NFS_MAXPATHLEN;
 154         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 155
 156         fh_put(&argp->fh);
 157         return nfserr;
 158 }
 159
 160 /*
 161  * Read a portion of a file.
 162  * N.B. After this call resp->fh needs an fh_put
 163  */
 164 static __be32
 165 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
 166                                        struct nfsd_readres  *resp)
 167 {
 168         __be32  nfserr;
 169
 170         dprintk("nfsd: READ    %s %d bytes at %d\n",
 171                 SVCFH_fmt(&argp->fh),
 172                 argp->count, argp->offset);
 173
 174         /* Obtain buffer pointer for payload. 19 is 1 word for
 175          * status, 17 words for fattr, and 1 word for the byte count.
 176          */
 177
 178         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 179                 char buf[RPC_MAX_ADDRBUFLEN];
 180                 printk(KERN_NOTICE
 181                         "oversized read request from %s (%d bytes)\n",
 182                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 183                                 argp->count);
 184                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 185         }
 186         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 187
 188         resp->count = argp->count;
 189         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 190                                   argp->offset,
 191                                   rqstp->rq_vec, argp->vlen,
 192                                   &resp->count);
 193
 194         if (nfserr) return nfserr;
 195         return fh_getattr(&resp->fh, &resp->stat);
 196 }
 197
 198 /*
 199  * Write data to a file
 200  * N.B. After this call resp->fh needs an fh_put
 201  */
 202 static __be32
 203 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 204                                         struct nfsd_attrstat  *resp)
 205 {
 206         __be32  nfserr;
 207         unsigned long cnt = argp->len;
 208
 209         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 210                 SVCFH_fmt(&argp->fh),
 211                 argp->len, argp->offset);
 212
 213         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), argp->offset,
 214                                 rqstp->rq_vec, argp->vlen, &cnt, NFS_DATA_SYNC);
 215         return nfsd_return_attrs(nfserr, resp);
 216 }
 217
 218 /*
 219  * CREATE processing is complicated. The keyword here is `overloaded.'
 220  * The parent directory is kept locked between the check for existence
 221  * and the actual create() call in compliance with VFS protocols.
 222  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 223  */
 224 static __be32
 225 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 226                                          struct nfsd_diropres   *resp)
 227 {
 228         svc_fh          *dirfhp = &argp->fh;
 229         svc_fh          *newfhp = &resp->fh;
 230         struct iattr    *attr = &argp->attrs;
 231         struct inode    *inode;
 232         struct dentry   *dchild;
 233         int             type, mode;
 234         __be32          nfserr;
 235         int             hosterr;
 236         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 237
 238         dprintk("nfsd: CREATE   %s %.*s\n",
 239                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 240
 241         /* First verify the parent file handle */
 242         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 243         if (nfserr)
 244                 goto done; /* must fh_put dirfhp even on error */
 245
 246         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 247
 248         nfserr = nfserr_exist;
 249         if (isdotent(argp->name, argp->len))
 250                 goto done;
 251         hosterr = fh_want_write(dirfhp);
 252         if (hosterr) {
 253                 nfserr = nfserrno(hosterr);
 254                 goto done;
 255         }
 256
 257         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 258         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 259         if (IS_ERR(dchild)) {
 260                 nfserr = nfserrno(PTR_ERR(dchild));
 261                 goto out_unlock;
 262         }
 263         fh_init(newfhp, NFS_FHSIZE);
 264         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 265         if (!nfserr && d_really_is_negative(dchild))
 266                 nfserr = nfserr_noent;
 267         dput(dchild);
 268         if (nfserr) {
 269                 if (nfserr != nfserr_noent)
 270                         goto out_unlock;
 271                 /*
 272                  * If the new file handle wasn't verified, we can't tell
 273                  * whether the file exists or not. Time to bail ...
 274                  */
 275                 nfserr = nfserr_acces;
 276                 if (!newfhp->fh_dentry) {
 277                         printk(KERN_WARNING
 278                                 "nfsd_proc_create: file handle not verified\n");
 279                         goto out_unlock;
 280                 }
 281         }
 282
 283         inode = d_inode(newfhp->fh_dentry);
 284
 285         /* Unfudge the mode bits */
 286         if (attr->ia_valid & ATTR_MODE) {
 287                 type = attr->ia_mode & S_IFMT;
 288                 mode = attr->ia_mode & ~S_IFMT;
 289                 if (!type) {
 290                         /* no type, so if target exists, assume same as that,
 291                          * else assume a file */
 292                         if (inode) {
 293                                 type = inode->i_mode & S_IFMT;
 294                                 switch(type) {
 295                                 case S_IFCHR:
 296                                 case S_IFBLK:
 297                                         /* reserve rdev for later checking */
 298                                         rdev = inode->i_rdev;
 299                                         attr->ia_valid |= ATTR_SIZE;
 300
 301                                         /* FALLTHROUGH */
 302                                 case S_IFIFO:
 303                                         /* this is probably a permission check..
 304                                          * at least IRIX implements perm checking on
 305                                          *   echo thing > device-special-file-or-pipe
 306                                          * by doing a CREATE with type==0
 307                                          */
 308                                         nfserr = nfsd_permission(rqstp,
 309                                                                  newfhp->fh_export,
 310                                                                  newfhp->fh_dentry,
 311                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 312                                         if (nfserr && nfserr != nfserr_rofs)
 313                                                 goto out_unlock;
 314                                 }
 315                         } else
 316                                 type = S_IFREG;
 317                 }
 318         } else if (inode) {
 319                 type = inode->i_mode & S_IFMT;
 320                 mode = inode->i_mode & ~S_IFMT;
 321         } else {
 322                 type = S_IFREG;
 323                 mode = 0;       /* ??? */
 324         }
 325
 326         attr->ia_valid |= ATTR_MODE;
 327         attr->ia_mode = mode;
 328
 329         /* Special treatment for non-regular files according to the
 330          * gospel of sun micro
 331          */
 332         if (type != S_IFREG) {
 333                 if (type != S_IFBLK && type != S_IFCHR) {
 334                         rdev = 0;
 335                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 336                         /* If you think you've seen the worst, grok this. */
 337                         type = S_IFIFO;
 338                 } else {
 339                         /* Okay, char or block special */
 340                         if (!rdev)
 341                                 rdev = wanted;
 342                 }
 343
 344                 /* we've used the SIZE information, so discard it */
 345                 attr->ia_valid &= ~ATTR_SIZE;
 346
 347                 /* Make sure the type and device matches */
 348                 nfserr = nfserr_exist;
 349                 if (inode && type != (inode->i_mode & S_IFMT))
 350                         goto out_unlock;
 351         }
 352
 353         nfserr = 0;
 354         if (!inode) {
 355                 /* File doesn't exist. Create it and set attrs */
 356                 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
 357                                         argp->len, attr, type, rdev, newfhp);
 358         } else if (type == S_IFREG) {
 359                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 360                         argp->name, attr->ia_valid, (long) attr->ia_size);
 361                 /* File already exists. We ignore all attributes except
 362                  * size, so that creat() behaves exactly like
 363                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 364                  */
 365                 attr->ia_valid &= ATTR_SIZE;
 366                 if (attr->ia_valid)
 367                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 368         }
 369
 370 out_unlock:
 371         /* We don't really need to unlock, as fh_put does it. */
 372         fh_unlock(dirfhp);
 373         fh_drop_write(dirfhp);
 374 done:
 375         fh_put(dirfhp);
 376         return nfsd_return_dirop(nfserr, resp);
 377 }
 378
 379 static __be32
 380 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 381                                          void                  *resp)
 382 {
 383         __be32  nfserr;
 384
 385         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 386                 argp->len, argp->name);
 387
 388         /* Unlink. -SIFDIR means file must not be a directory */
 389         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 390         fh_put(&argp->fh);
 391         return nfserr;
 392 }
 393
 394 static __be32
 395 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
 396                                          void                   *resp)
 397 {
 398         __be32  nfserr;
 399
 400         dprintk("nfsd: RENAME   %s %.*s -> \n",
 401                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 402         dprintk("nfsd:        ->  %s %.*s\n",
 403                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 404
 405         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 406                                     &argp->tfh, argp->tname, argp->tlen);
 407         fh_put(&argp->ffh);
 408         fh_put(&argp->tfh);
 409         return nfserr;
 410 }
 411
 412 static __be32
 413 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
 414                                 void                        *resp)
 415 {
 416         __be32  nfserr;
 417
 418         dprintk("nfsd: LINK     %s ->\n",
 419                 SVCFH_fmt(&argp->ffh));
 420         dprintk("nfsd:    %s %.*s\n",
 421                 SVCFH_fmt(&argp->tfh),
 422                 argp->tlen,
 423                 argp->tname);
 424
 425         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 426                                   &argp->ffh);
 427         fh_put(&argp->ffh);
 428         fh_put(&argp->tfh);
 429         return nfserr;
 430 }
 431
 432 static __be32
 433 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
 434                                           void                    *resp)
 435 {
 436         struct svc_fh   newfh;
 437         __be32          nfserr;
 438
 439         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 440                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 441                 argp->tlen, argp->tname);
 442
 443         fh_init(&newfh, NFS_FHSIZE);
 444         /*
 445          * Crazy hack: the request fits in a page, and already-decoded
 446          * attributes follow argp->tname, so it's safe to just write a
 447          * null to ensure it's null-terminated:
 448          */
 449         argp->tname[argp->tlen] = '\0';
 450         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 451                                                  argp->tname, &newfh);
 452
 453         fh_put(&argp->ffh);
 454         fh_put(&newfh);
 455         return nfserr;
 456 }
 457
 458 /*
 459  * Make directory. This operation is not idempotent.
 460  * N.B. After this call resp->fh needs an fh_put
 461  */
 462 static __be32
 463 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
 464                                         struct nfsd_diropres   *resp)
 465 {
 466         __be32  nfserr;
 467
 468         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 469
 470         if (resp->fh.fh_dentry) {
 471                 printk(KERN_WARNING
 472                         "nfsd_proc_mkdir: response already verified??\n");
 473         }
 474
 475         argp->attrs.ia_valid &= ~ATTR_SIZE;
 476         fh_init(&resp->fh, NFS_FHSIZE);
 477         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 478                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 479         fh_put(&argp->fh);
 480         return nfsd_return_dirop(nfserr, resp);
 481 }
 482
 483 /*
 484  * Remove a directory
 485  */
 486 static __be32
 487 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 488                                         void                  *resp)
 489 {
 490         __be32  nfserr;
 491
 492         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 493
 494         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 495         fh_put(&argp->fh);
 496         return nfserr;
 497 }
 498
 499 /*
 500  * Read a portion of a directory.
 501  */
 502 static __be32
 503 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
 504                                           struct nfsd_readdirres  *resp)
 505 {
 506         int             count;
 507         __be32          nfserr;
 508         loff_t          offset;
 509
 510         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 511                 SVCFH_fmt(&argp->fh),
 512                 argp->count, argp->cookie);
 513
 514         /* Shrink to the client read size */
 515         count = (argp->count >> 2) - 2;
 516
 517         /* Make sure we've room for the NULL ptr & eof flag */
 518         count -= 2;
 519         if (count < 0)
 520                 count = 0;
 521
 522         resp->buffer = argp->buffer;
 523         resp->offset = NULL;
 524         resp->buflen = count;
 525         resp->common.err = nfs_ok;
 526         /* Read directory and encode entries on the fly */
 527         offset = argp->cookie;
 528         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 529                               &resp->common, nfssvc_encode_entry);
 530
 531         resp->count = resp->buffer - argp->buffer;
 532         if (resp->offset)
 533                 *resp->offset = htonl(offset);
 534
 535         fh_put(&argp->fh);
 536         return nfserr;
 537 }
 538
 539 /*
 540  * Get file system info
 541  */
 542 static __be32
 543 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
 544                                           struct nfsd_statfsres *resp)
 545 {
 546         __be32  nfserr;
 547
 548         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 549
 550         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 551                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 552         fh_put(&argp->fh);
 553         return nfserr;
 554 }
 555
 556 /*
 557  * NFSv2 Server procedures.
 558  * Only the results of non-idempotent operations are cached.
 559  */
 560 struct nfsd_void { int dummy; };
 561
 562 #define ST 1            /* status */
 563 #define FH 8            /* filehandle */
 564 #define AT 18           /* attributes */
 565
 566 static struct svc_procedure             nfsd_procedures2[18] = {
 567         [NFSPROC_NULL] = {
 568                 .pc_func = (svc_procfunc) nfsd_proc_null,
 569                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 570                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 571                 .pc_argsize = sizeof(struct nfsd_void),
 572                 .pc_ressize = sizeof(struct nfsd_void),
 573                 .pc_cachetype = RC_NOCACHE,
 574                 .pc_xdrressize = ST,
 575         },
 576         [NFSPROC_GETATTR] = {
 577                 .pc_func = (svc_procfunc) nfsd_proc_getattr,
 578                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 579                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 580                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 581                 .pc_argsize = sizeof(struct nfsd_fhandle),
 582                 .pc_ressize = sizeof(struct nfsd_attrstat),
 583                 .pc_cachetype = RC_NOCACHE,
 584                 .pc_xdrressize = ST+AT,
 585         },
 586         [NFSPROC_SETATTR] = {
 587                 .pc_func = (svc_procfunc) nfsd_proc_setattr,
 588                 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
 589                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 590                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 591                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 592                 .pc_ressize = sizeof(struct nfsd_attrstat),
 593                 .pc_cachetype = RC_REPLBUFF,
 594                 .pc_xdrressize = ST+AT,
 595         },
 596         [NFSPROC_ROOT] = {
 597                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 598                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 599                 .pc_argsize = sizeof(struct nfsd_void),
 600                 .pc_ressize = sizeof(struct nfsd_void),
 601                 .pc_cachetype = RC_NOCACHE,
 602                 .pc_xdrressize = ST,
 603         },
 604         [NFSPROC_LOOKUP] = {
 605                 .pc_func = (svc_procfunc) nfsd_proc_lookup,
 606                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 607                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 608                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 609                 .pc_argsize = sizeof(struct nfsd_diropargs),
 610                 .pc_ressize = sizeof(struct nfsd_diropres),
 611                 .pc_cachetype = RC_NOCACHE,
 612                 .pc_xdrressize = ST+FH+AT,
 613         },
 614         [NFSPROC_READLINK] = {
 615                 .pc_func = (svc_procfunc) nfsd_proc_readlink,
 616                 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
 617                 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
 618                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 619                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 620                 .pc_cachetype = RC_NOCACHE,
 621                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 622         },
 623         [NFSPROC_READ] = {
 624                 .pc_func = (svc_procfunc) nfsd_proc_read,
 625                 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
 626                 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
 627                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 628                 .pc_argsize = sizeof(struct nfsd_readargs),
 629                 .pc_ressize = sizeof(struct nfsd_readres),
 630                 .pc_cachetype = RC_NOCACHE,
 631                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 632         },
 633         [NFSPROC_WRITECACHE] = {
 634                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
 635                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 636                 .pc_argsize = sizeof(struct nfsd_void),
 637                 .pc_ressize = sizeof(struct nfsd_void),
 638                 .pc_cachetype = RC_NOCACHE,
 639                 .pc_xdrressize = ST,
 640         },
 641         [NFSPROC_WRITE] = {
 642                 .pc_func = (svc_procfunc) nfsd_proc_write,
 643                 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
 644                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
 645                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 646                 .pc_argsize = sizeof(struct nfsd_writeargs),
 647                 .pc_ressize = sizeof(struct nfsd_attrstat),
 648                 .pc_cachetype = RC_REPLBUFF,
 649                 .pc_xdrressize = ST+AT,
 650         },
 651         [NFSPROC_CREATE] = {
 652                 .pc_func = (svc_procfunc) nfsd_proc_create,
 653                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 654                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 655                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 656                 .pc_argsize = sizeof(struct nfsd_createargs),
 657                 .pc_ressize = sizeof(struct nfsd_diropres),
 658                 .pc_cachetype = RC_REPLBUFF,
 659                 .pc_xdrressize = ST+FH+AT,
 660         },
 661         [NFSPROC_REMOVE] = {
 662                 .pc_func = (svc_procfunc) nfsd_proc_remove,
 663                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 664                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 665                 .pc_argsize = sizeof(struct nfsd_diropargs),
 666                 .pc_ressize = sizeof(struct nfsd_void),
 667                 .pc_cachetype = RC_REPLSTAT,
 668                 .pc_xdrressize = ST,
 669         },
 670         [NFSPROC_RENAME] = {
 671                 .pc_func = (svc_procfunc) nfsd_proc_rename,
 672                 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
 673                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 674                 .pc_argsize = sizeof(struct nfsd_renameargs),
 675                 .pc_ressize = sizeof(struct nfsd_void),
 676                 .pc_cachetype = RC_REPLSTAT,
 677                 .pc_xdrressize = ST,
 678         },
 679         [NFSPROC_LINK] = {
 680                 .pc_func = (svc_procfunc) nfsd_proc_link,
 681                 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
 682                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 683                 .pc_argsize = sizeof(struct nfsd_linkargs),
 684                 .pc_ressize = sizeof(struct nfsd_void),
 685                 .pc_cachetype = RC_REPLSTAT,
 686                 .pc_xdrressize = ST,
 687         },
 688         [NFSPROC_SYMLINK] = {
 689                 .pc_func = (svc_procfunc) nfsd_proc_symlink,
 690                 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
 691                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 692                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 693                 .pc_ressize = sizeof(struct nfsd_void),
 694                 .pc_cachetype = RC_REPLSTAT,
 695                 .pc_xdrressize = ST,
 696         },
 697         [NFSPROC_MKDIR] = {
 698                 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
 699                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
 700                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
 701                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
 702                 .pc_argsize = sizeof(struct nfsd_createargs),
 703                 .pc_ressize = sizeof(struct nfsd_diropres),
 704                 .pc_cachetype = RC_REPLBUFF,
 705                 .pc_xdrressize = ST+FH+AT,
 706         },
 707         [NFSPROC_RMDIR] = {
 708                 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
 709                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
 710                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
 711                 .pc_argsize = sizeof(struct nfsd_diropargs),
 712                 .pc_ressize = sizeof(struct nfsd_void),
 713                 .pc_cachetype = RC_REPLSTAT,
 714                 .pc_xdrressize = ST,
 715         },
 716         [NFSPROC_READDIR] = {
 717                 .pc_func = (svc_procfunc) nfsd_proc_readdir,
 718                 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
 719                 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
 720                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 721                 .pc_ressize = sizeof(struct nfsd_readdirres),
 722                 .pc_cachetype = RC_NOCACHE,
 723         },
 724         [NFSPROC_STATFS] = {
 725                 .pc_func = (svc_procfunc) nfsd_proc_statfs,
 726                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
 727                 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
 728                 .pc_argsize = sizeof(struct nfsd_fhandle),
 729                 .pc_ressize = sizeof(struct nfsd_statfsres),
 730                 .pc_cachetype = RC_NOCACHE,
 731                 .pc_xdrressize = ST+5,
 732         },
 733 };
 734
 735
 736 struct svc_version      nfsd_version2 = {
 737                 .vs_vers        = 2,
 738                 .vs_nproc       = 18,
 739                 .vs_proc        = nfsd_procedures2,
 740                 .vs_dispatch    = nfsd_dispatch,
 741                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 742 };
 743
 744 /*
 745  * Map errnos to NFS errnos.
 746  */
 747 __be32
 748 nfserrno (int errno)
 749 {
 750         static struct {
 751                 __be32  nfserr;
 752                 int     syserr;
 753         } nfs_errtbl[] = {
 754                 { nfs_ok, 0 },
 755                 { nfserr_perm, -EPERM },
 756                 { nfserr_noent, -ENOENT },
 757                 { nfserr_io, -EIO },
 758                 { nfserr_nxio, -ENXIO },
 759                 { nfserr_fbig, -E2BIG },
 760                 { nfserr_acces, -EACCES },
 761                 { nfserr_exist, -EEXIST },
 762                 { nfserr_xdev, -EXDEV },
 763                 { nfserr_mlink, -EMLINK },
 764                 { nfserr_nodev, -ENODEV },
 765                 { nfserr_notdir, -ENOTDIR },
 766                 { nfserr_isdir, -EISDIR },
 767                 { nfserr_inval, -EINVAL },
 768                 { nfserr_fbig, -EFBIG },
 769                 { nfserr_nospc, -ENOSPC },
 770                 { nfserr_rofs, -EROFS },
 771                 { nfserr_mlink, -EMLINK },
 772                 { nfserr_nametoolong, -ENAMETOOLONG },
 773                 { nfserr_notempty, -ENOTEMPTY },
 774 #ifdef EDQUOT
 775                 { nfserr_dquot, -EDQUOT },
 776 #endif
 777                 { nfserr_stale, -ESTALE },
 778                 { nfserr_jukebox, -ETIMEDOUT },
 779                 { nfserr_jukebox, -ERESTARTSYS },
 780                 { nfserr_jukebox, -EAGAIN },
 781                 { nfserr_jukebox, -EWOULDBLOCK },
 782                 { nfserr_jukebox, -ENOMEM },
 783                 { nfserr_io, -ETXTBSY },
 784                 { nfserr_notsupp, -EOPNOTSUPP },
 785                 { nfserr_toosmall, -ETOOSMALL },
 786                 { nfserr_serverfault, -ESERVERFAULT },
 787                 { nfserr_serverfault, -ENFILE },
 788                 { nfserr_io, -EUCLEAN },
 789         };
 790         int     i;
 791
 792         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 793                 if (nfs_errtbl[i].syserr == errno)
 794                         return nfs_errtbl[i].nfserr;
 795         }
 796         WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
 797         return nfserr_io;
 798 }
 799