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)
  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)
  43 {
  44         struct nfsd_fhandle *argp = rqstp->rq_argp;
  45         struct nfsd_attrstat *resp = rqstp->rq_resp;
  46         __be32 nfserr;
  47         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  48
  49         fh_copy(&resp->fh, &argp->fh);
  50         nfserr = fh_verify(rqstp, &resp->fh, 0,
  51                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  52         return nfsd_return_attrs(nfserr, resp);
  53 }
  54
  55 /*
  56  * Set a file's attributes
  57  * N.B. After this call resp->fh needs an fh_put
  58  */
  59 static __be32
  60 nfsd_proc_setattr(struct svc_rqst *rqstp)
  61 {
  62         struct nfsd_sattrargs *argp = rqstp->rq_argp;
  63         struct nfsd_attrstat *resp = rqstp->rq_resp;
  64         struct iattr *iap = &argp->attrs;
  65         struct svc_fh *fhp;
  66         __be32 nfserr;
  67
  68         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  69                 SVCFH_fmt(&argp->fh),
  70                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  71
  72         fhp = fh_copy(&resp->fh, &argp->fh);
  73
  74         /*
  75          * NFSv2 does not differentiate between "set-[ac]time-to-now"
  76          * which only requires access, and "set-[ac]time-to-X" which
  77          * requires ownership.
  78          * So if it looks like it might be "set both to the same time which
  79          * is close to now", and if setattr_prepare fails, then we
  80          * convert to "set to now" instead of "set to explicit time"
  81          *
  82          * We only call setattr_prepare as the last test as technically
  83          * it is not an interface that we should be using.
  84          */
  85 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
  86 #define MAX_TOUCH_TIME_ERROR (30*60)
  87         if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
  88             iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
  89                 /*
  90                  * Looks probable.
  91                  *
  92                  * Now just make sure time is in the right ballpark.
  93                  * Solaris, at least, doesn't seem to care what the time
  94                  * request is.  We require it be within 30 minutes of now.
  95                  */
  96                 time_t delta = iap->ia_atime.tv_sec - get_seconds();
  97
  98                 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
  99                 if (nfserr)
 100                         goto done;
 101
 102                 if (delta < 0)
 103                         delta = -delta;
 104                 if (delta < MAX_TOUCH_TIME_ERROR &&
 105                     setattr_prepare(fhp->fh_dentry, 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)
 128 {
 129         struct nfsd_diropargs *argp = rqstp->rq_argp;
 130         struct nfsd_diropres *resp = rqstp->rq_resp;
 131         __be32  nfserr;
 132
 133         dprintk("nfsd: LOOKUP   %s %.*s\n",
 134                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 135
 136         fh_init(&resp->fh, NFS_FHSIZE);
 137         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 138                                  &resp->fh);
 139
 140         fh_put(&argp->fh);
 141         return nfsd_return_dirop(nfserr, resp);
 142 }
 143
 144 /*
 145  * Read a symlink.
 146  */
 147 static __be32
 148 nfsd_proc_readlink(struct svc_rqst *rqstp)
 149 {
 150         struct nfsd_readlinkargs *argp = rqstp->rq_argp;
 151         struct nfsd_readlinkres *resp = rqstp->rq_resp;
 152         __be32  nfserr;
 153
 154         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 155
 156         /* Read the symlink. */
 157         resp->len = NFS_MAXPATHLEN;
 158         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 159
 160         fh_put(&argp->fh);
 161         return nfserr;
 162 }
 163
 164 /*
 165  * Read a portion of a file.
 166  * N.B. After this call resp->fh needs an fh_put
 167  */
 168 static __be32
 169 nfsd_proc_read(struct svc_rqst *rqstp)
 170 {
 171         struct nfsd_readargs *argp = rqstp->rq_argp;
 172         struct nfsd_readres *resp = rqstp->rq_resp;
 173         __be32  nfserr;
 174
 175         dprintk("nfsd: READ    %s %d bytes at %d\n",
 176                 SVCFH_fmt(&argp->fh),
 177                 argp->count, argp->offset);
 178
 179         /* Obtain buffer pointer for payload. 19 is 1 word for
 180          * status, 17 words for fattr, and 1 word for the byte count.
 181          */
 182
 183         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 184                 char buf[RPC_MAX_ADDRBUFLEN];
 185                 printk(KERN_NOTICE
 186                         "oversized read request from %s (%d bytes)\n",
 187                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 188                                 argp->count);
 189                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 190         }
 191         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 192
 193         resp->count = argp->count;
 194         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 195                                   argp->offset,
 196                                   rqstp->rq_vec, argp->vlen,
 197                                   &resp->count);
 198
 199         if (nfserr) return nfserr;
 200         return fh_getattr(&resp->fh, &resp->stat);
 201 }
 202
 203 /*
 204  * Write data to a file
 205  * N.B. After this call resp->fh needs an fh_put
 206  */
 207 static __be32
 208 nfsd_proc_write(struct svc_rqst *rqstp)
 209 {
 210         struct nfsd_writeargs *argp = rqstp->rq_argp;
 211         struct nfsd_attrstat *resp = rqstp->rq_resp;
 212         __be32  nfserr;
 213         unsigned long cnt = argp->len;
 214
 215         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 216                 SVCFH_fmt(&argp->fh),
 217                 argp->len, argp->offset);
 218
 219         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), argp->offset,
 220                                 rqstp->rq_vec, argp->vlen, &cnt, NFS_DATA_SYNC);
 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)
 232 {
 233         struct nfsd_createargs *argp = rqstp->rq_argp;
 234         struct nfsd_diropres *resp = rqstp->rq_resp;
 235         svc_fh          *dirfhp = &argp->fh;
 236         svc_fh          *newfhp = &resp->fh;
 237         struct iattr    *attr = &argp->attrs;
 238         struct inode    *inode;
 239         struct dentry   *dchild;
 240         int             type, mode;
 241         __be32          nfserr;
 242         int             hosterr;
 243         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 244
 245         dprintk("nfsd: CREATE   %s %.*s\n",
 246                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 247
 248         /* First verify the parent file handle */
 249         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 250         if (nfserr)
 251                 goto done; /* must fh_put dirfhp even on error */
 252
 253         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 254
 255         nfserr = nfserr_exist;
 256         if (isdotent(argp->name, argp->len))
 257                 goto done;
 258         hosterr = fh_want_write(dirfhp);
 259         if (hosterr) {
 260                 nfserr = nfserrno(hosterr);
 261                 goto done;
 262         }
 263
 264         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 265         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 266         if (IS_ERR(dchild)) {
 267                 nfserr = nfserrno(PTR_ERR(dchild));
 268                 goto out_unlock;
 269         }
 270         fh_init(newfhp, NFS_FHSIZE);
 271         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 272         if (!nfserr && d_really_is_negative(dchild))
 273                 nfserr = nfserr_noent;
 274         dput(dchild);
 275         if (nfserr) {
 276                 if (nfserr != nfserr_noent)
 277                         goto out_unlock;
 278                 /*
 279                  * If the new file handle wasn't verified, we can't tell
 280                  * whether the file exists or not. Time to bail ...
 281                  */
 282                 nfserr = nfserr_acces;
 283                 if (!newfhp->fh_dentry) {
 284                         printk(KERN_WARNING
 285                                 "nfsd_proc_create: file handle not verified\n");
 286                         goto out_unlock;
 287                 }
 288         }
 289
 290         inode = d_inode(newfhp->fh_dentry);
 291
 292         /* Unfudge the mode bits */
 293         if (attr->ia_valid & ATTR_MODE) {
 294                 type = attr->ia_mode & S_IFMT;
 295                 mode = attr->ia_mode & ~S_IFMT;
 296                 if (!type) {
 297                         /* no type, so if target exists, assume same as that,
 298                          * else assume a file */
 299                         if (inode) {
 300                                 type = inode->i_mode & S_IFMT;
 301                                 switch(type) {
 302                                 case S_IFCHR:
 303                                 case S_IFBLK:
 304                                         /* reserve rdev for later checking */
 305                                         rdev = inode->i_rdev;
 306                                         attr->ia_valid |= ATTR_SIZE;
 307
 308                                         /* FALLTHROUGH */
 309                                 case S_IFIFO:
 310                                         /* this is probably a permission check..
 311                                          * at least IRIX implements perm checking on
 312                                          *   echo thing > device-special-file-or-pipe
 313                                          * by doing a CREATE with type==0
 314                                          */
 315                                         nfserr = nfsd_permission(rqstp,
 316                                                                  newfhp->fh_export,
 317                                                                  newfhp->fh_dentry,
 318                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 319                                         if (nfserr && nfserr != nfserr_rofs)
 320                                                 goto out_unlock;
 321                                 }
 322                         } else
 323                                 type = S_IFREG;
 324                 }
 325         } else if (inode) {
 326                 type = inode->i_mode & S_IFMT;
 327                 mode = inode->i_mode & ~S_IFMT;
 328         } else {
 329                 type = S_IFREG;
 330                 mode = 0;       /* ??? */
 331         }
 332
 333         attr->ia_valid |= ATTR_MODE;
 334         attr->ia_mode = mode;
 335
 336         /* Special treatment for non-regular files according to the
 337          * gospel of sun micro
 338          */
 339         if (type != S_IFREG) {
 340                 if (type != S_IFBLK && type != S_IFCHR) {
 341                         rdev = 0;
 342                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 343                         /* If you think you've seen the worst, grok this. */
 344                         type = S_IFIFO;
 345                 } else {
 346                         /* Okay, char or block special */
 347                         if (!rdev)
 348                                 rdev = wanted;
 349                 }
 350
 351                 /* we've used the SIZE information, so discard it */
 352                 attr->ia_valid &= ~ATTR_SIZE;
 353
 354                 /* Make sure the type and device matches */
 355                 nfserr = nfserr_exist;
 356                 if (inode && type != (inode->i_mode & S_IFMT))
 357                         goto out_unlock;
 358         }
 359
 360         nfserr = 0;
 361         if (!inode) {
 362                 /* File doesn't exist. Create it and set attrs */
 363                 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
 364                                         argp->len, attr, type, rdev, newfhp);
 365         } else if (type == S_IFREG) {
 366                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 367                         argp->name, attr->ia_valid, (long) attr->ia_size);
 368                 /* File already exists. We ignore all attributes except
 369                  * size, so that creat() behaves exactly like
 370                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 371                  */
 372                 attr->ia_valid &= ATTR_SIZE;
 373                 if (attr->ia_valid)
 374                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 375         }
 376
 377 out_unlock:
 378         /* We don't really need to unlock, as fh_put does it. */
 379         fh_unlock(dirfhp);
 380         fh_drop_write(dirfhp);
 381 done:
 382         fh_put(dirfhp);
 383         return nfsd_return_dirop(nfserr, resp);
 384 }
 385
 386 static __be32
 387 nfsd_proc_remove(struct svc_rqst *rqstp)
 388 {
 389         struct nfsd_diropargs *argp = rqstp->rq_argp;
 390         __be32  nfserr;
 391
 392         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 393                 argp->len, argp->name);
 394
 395         /* Unlink. -SIFDIR means file must not be a directory */
 396         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 397         fh_put(&argp->fh);
 398         return nfserr;
 399 }
 400
 401 static __be32
 402 nfsd_proc_rename(struct svc_rqst *rqstp)
 403 {
 404         struct nfsd_renameargs *argp = rqstp->rq_argp;
 405         __be32  nfserr;
 406
 407         dprintk("nfsd: RENAME   %s %.*s -> \n",
 408                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 409         dprintk("nfsd:        ->  %s %.*s\n",
 410                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 411
 412         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 413                                     &argp->tfh, argp->tname, argp->tlen);
 414         fh_put(&argp->ffh);
 415         fh_put(&argp->tfh);
 416         return nfserr;
 417 }
 418
 419 static __be32
 420 nfsd_proc_link(struct svc_rqst *rqstp)
 421 {
 422         struct nfsd_linkargs *argp = rqstp->rq_argp;
 423         __be32  nfserr;
 424
 425         dprintk("nfsd: LINK     %s ->\n",
 426                 SVCFH_fmt(&argp->ffh));
 427         dprintk("nfsd:    %s %.*s\n",
 428                 SVCFH_fmt(&argp->tfh),
 429                 argp->tlen,
 430                 argp->tname);
 431
 432         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 433                                   &argp->ffh);
 434         fh_put(&argp->ffh);
 435         fh_put(&argp->tfh);
 436         return nfserr;
 437 }
 438
 439 static __be32
 440 nfsd_proc_symlink(struct svc_rqst *rqstp)
 441 {
 442         struct nfsd_symlinkargs *argp = rqstp->rq_argp;
 443         struct svc_fh   newfh;
 444         __be32          nfserr;
 445
 446         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 447                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 448                 argp->tlen, argp->tname);
 449
 450         fh_init(&newfh, NFS_FHSIZE);
 451         /*
 452          * Crazy hack: the request fits in a page, and already-decoded
 453          * attributes follow argp->tname, so it's safe to just write a
 454          * null to ensure it's null-terminated:
 455          */
 456         argp->tname[argp->tlen] = '\0';
 457         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 458                                                  argp->tname, &newfh);
 459
 460         fh_put(&argp->ffh);
 461         fh_put(&newfh);
 462         return nfserr;
 463 }
 464
 465 /*
 466  * Make directory. This operation is not idempotent.
 467  * N.B. After this call resp->fh needs an fh_put
 468  */
 469 static __be32
 470 nfsd_proc_mkdir(struct svc_rqst *rqstp)
 471 {
 472         struct nfsd_createargs *argp = rqstp->rq_argp;
 473         struct nfsd_diropres *resp = rqstp->rq_resp;
 474         __be32  nfserr;
 475
 476         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 477
 478         if (resp->fh.fh_dentry) {
 479                 printk(KERN_WARNING
 480                         "nfsd_proc_mkdir: response already verified??\n");
 481         }
 482
 483         argp->attrs.ia_valid &= ~ATTR_SIZE;
 484         fh_init(&resp->fh, NFS_FHSIZE);
 485         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 486                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 487         fh_put(&argp->fh);
 488         return nfsd_return_dirop(nfserr, resp);
 489 }
 490
 491 /*
 492  * Remove a directory
 493  */
 494 static __be32
 495 nfsd_proc_rmdir(struct svc_rqst *rqstp)
 496 {
 497         struct nfsd_diropargs *argp = rqstp->rq_argp;
 498         __be32  nfserr;
 499
 500         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 501
 502         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 503         fh_put(&argp->fh);
 504         return nfserr;
 505 }
 506
 507 /*
 508  * Read a portion of a directory.
 509  */
 510 static __be32
 511 nfsd_proc_readdir(struct svc_rqst *rqstp)
 512 {
 513         struct nfsd_readdirargs *argp = rqstp->rq_argp;
 514         struct nfsd_readdirres *resp = rqstp->rq_resp;
 515         int             count;
 516         __be32          nfserr;
 517         loff_t          offset;
 518
 519         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 520                 SVCFH_fmt(&argp->fh),
 521                 argp->count, argp->cookie);
 522
 523         /* Shrink to the client read size */
 524         count = (argp->count >> 2) - 2;
 525
 526         /* Make sure we've room for the NULL ptr & eof flag */
 527         count -= 2;
 528         if (count < 0)
 529                 count = 0;
 530
 531         resp->buffer = argp->buffer;
 532         resp->offset = NULL;
 533         resp->buflen = count;
 534         resp->common.err = nfs_ok;
 535         /* Read directory and encode entries on the fly */
 536         offset = argp->cookie;
 537         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 538                               &resp->common, nfssvc_encode_entry);
 539
 540         resp->count = resp->buffer - argp->buffer;
 541         if (resp->offset)
 542                 *resp->offset = htonl(offset);
 543
 544         fh_put(&argp->fh);
 545         return nfserr;
 546 }
 547
 548 /*
 549  * Get file system info
 550  */
 551 static __be32
 552 nfsd_proc_statfs(struct svc_rqst *rqstp)
 553 {
 554         struct nfsd_fhandle *argp = rqstp->rq_argp;
 555         struct nfsd_statfsres *resp = rqstp->rq_resp;
 556         __be32  nfserr;
 557
 558         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 559
 560         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 561                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 562         fh_put(&argp->fh);
 563         return nfserr;
 564 }
 565
 566 /*
 567  * NFSv2 Server procedures.
 568  * Only the results of non-idempotent operations are cached.
 569  */
 570 struct nfsd_void { int dummy; };
 571
 572 #define ST 1            /* status */
 573 #define FH 8            /* filehandle */
 574 #define AT 18           /* attributes */
 575
 576 static const struct svc_procedure nfsd_procedures2[18] = {
 577         [NFSPROC_NULL] = {
 578                 .pc_func = nfsd_proc_null,
 579                 .pc_decode = nfssvc_decode_void,
 580                 .pc_encode = nfssvc_encode_void,
 581                 .pc_argsize = sizeof(struct nfsd_void),
 582                 .pc_ressize = sizeof(struct nfsd_void),
 583                 .pc_cachetype = RC_NOCACHE,
 584                 .pc_xdrressize = ST,
 585         },
 586         [NFSPROC_GETATTR] = {
 587                 .pc_func = nfsd_proc_getattr,
 588                 .pc_decode = nfssvc_decode_fhandle,
 589                 .pc_encode = nfssvc_encode_attrstat,
 590                 .pc_release = nfssvc_release_fhandle,
 591                 .pc_argsize = sizeof(struct nfsd_fhandle),
 592                 .pc_ressize = sizeof(struct nfsd_attrstat),
 593                 .pc_cachetype = RC_NOCACHE,
 594                 .pc_xdrressize = ST+AT,
 595         },
 596         [NFSPROC_SETATTR] = {
 597                 .pc_func = nfsd_proc_setattr,
 598                 .pc_decode = nfssvc_decode_sattrargs,
 599                 .pc_encode = nfssvc_encode_attrstat,
 600                 .pc_release = nfssvc_release_fhandle,
 601                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 602                 .pc_ressize = sizeof(struct nfsd_attrstat),
 603                 .pc_cachetype = RC_REPLBUFF,
 604                 .pc_xdrressize = ST+AT,
 605         },
 606         [NFSPROC_ROOT] = {
 607                 .pc_decode = nfssvc_decode_void,
 608                 .pc_encode = nfssvc_encode_void,
 609                 .pc_argsize = sizeof(struct nfsd_void),
 610                 .pc_ressize = sizeof(struct nfsd_void),
 611                 .pc_cachetype = RC_NOCACHE,
 612                 .pc_xdrressize = ST,
 613         },
 614         [NFSPROC_LOOKUP] = {
 615                 .pc_func = nfsd_proc_lookup,
 616                 .pc_decode = nfssvc_decode_diropargs,
 617                 .pc_encode = nfssvc_encode_diropres,
 618                 .pc_release = nfssvc_release_fhandle,
 619                 .pc_argsize = sizeof(struct nfsd_diropargs),
 620                 .pc_ressize = sizeof(struct nfsd_diropres),
 621                 .pc_cachetype = RC_NOCACHE,
 622                 .pc_xdrressize = ST+FH+AT,
 623         },
 624         [NFSPROC_READLINK] = {
 625                 .pc_func = nfsd_proc_readlink,
 626                 .pc_decode = nfssvc_decode_readlinkargs,
 627                 .pc_encode = nfssvc_encode_readlinkres,
 628                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 629                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 630                 .pc_cachetype = RC_NOCACHE,
 631                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 632         },
 633         [NFSPROC_READ] = {
 634                 .pc_func = nfsd_proc_read,
 635                 .pc_decode = nfssvc_decode_readargs,
 636                 .pc_encode = nfssvc_encode_readres,
 637                 .pc_release = nfssvc_release_fhandle,
 638                 .pc_argsize = sizeof(struct nfsd_readargs),
 639                 .pc_ressize = sizeof(struct nfsd_readres),
 640                 .pc_cachetype = RC_NOCACHE,
 641                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 642         },
 643         [NFSPROC_WRITECACHE] = {
 644                 .pc_decode = nfssvc_decode_void,
 645                 .pc_encode = nfssvc_encode_void,
 646                 .pc_argsize = sizeof(struct nfsd_void),
 647                 .pc_ressize = sizeof(struct nfsd_void),
 648                 .pc_cachetype = RC_NOCACHE,
 649                 .pc_xdrressize = ST,
 650         },
 651         [NFSPROC_WRITE] = {
 652                 .pc_func = nfsd_proc_write,
 653                 .pc_decode = nfssvc_decode_writeargs,
 654                 .pc_encode = nfssvc_encode_attrstat,
 655                 .pc_release = nfssvc_release_fhandle,
 656                 .pc_argsize = sizeof(struct nfsd_writeargs),
 657                 .pc_ressize = sizeof(struct nfsd_attrstat),
 658                 .pc_cachetype = RC_REPLBUFF,
 659                 .pc_xdrressize = ST+AT,
 660         },
 661         [NFSPROC_CREATE] = {
 662                 .pc_func = nfsd_proc_create,
 663                 .pc_decode = nfssvc_decode_createargs,
 664                 .pc_encode = nfssvc_encode_diropres,
 665                 .pc_release = nfssvc_release_fhandle,
 666                 .pc_argsize = sizeof(struct nfsd_createargs),
 667                 .pc_ressize = sizeof(struct nfsd_diropres),
 668                 .pc_cachetype = RC_REPLBUFF,
 669                 .pc_xdrressize = ST+FH+AT,
 670         },
 671         [NFSPROC_REMOVE] = {
 672                 .pc_func = nfsd_proc_remove,
 673                 .pc_decode = nfssvc_decode_diropargs,
 674                 .pc_encode = nfssvc_encode_void,
 675                 .pc_argsize = sizeof(struct nfsd_diropargs),
 676                 .pc_ressize = sizeof(struct nfsd_void),
 677                 .pc_cachetype = RC_REPLSTAT,
 678                 .pc_xdrressize = ST,
 679         },
 680         [NFSPROC_RENAME] = {
 681                 .pc_func = nfsd_proc_rename,
 682                 .pc_decode = nfssvc_decode_renameargs,
 683                 .pc_encode = nfssvc_encode_void,
 684                 .pc_argsize = sizeof(struct nfsd_renameargs),
 685                 .pc_ressize = sizeof(struct nfsd_void),
 686                 .pc_cachetype = RC_REPLSTAT,
 687                 .pc_xdrressize = ST,
 688         },
 689         [NFSPROC_LINK] = {
 690                 .pc_func = nfsd_proc_link,
 691                 .pc_decode = nfssvc_decode_linkargs,
 692                 .pc_encode = nfssvc_encode_void,
 693                 .pc_argsize = sizeof(struct nfsd_linkargs),
 694                 .pc_ressize = sizeof(struct nfsd_void),
 695                 .pc_cachetype = RC_REPLSTAT,
 696                 .pc_xdrressize = ST,
 697         },
 698         [NFSPROC_SYMLINK] = {
 699                 .pc_func = nfsd_proc_symlink,
 700                 .pc_decode = nfssvc_decode_symlinkargs,
 701                 .pc_encode = nfssvc_encode_void,
 702                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 703                 .pc_ressize = sizeof(struct nfsd_void),
 704                 .pc_cachetype = RC_REPLSTAT,
 705                 .pc_xdrressize = ST,
 706         },
 707         [NFSPROC_MKDIR] = {
 708                 .pc_func = nfsd_proc_mkdir,
 709                 .pc_decode = nfssvc_decode_createargs,
 710                 .pc_encode = nfssvc_encode_diropres,
 711                 .pc_release = nfssvc_release_fhandle,
 712                 .pc_argsize = sizeof(struct nfsd_createargs),
 713                 .pc_ressize = sizeof(struct nfsd_diropres),
 714                 .pc_cachetype = RC_REPLBUFF,
 715                 .pc_xdrressize = ST+FH+AT,
 716         },
 717         [NFSPROC_RMDIR] = {
 718                 .pc_func = nfsd_proc_rmdir,
 719                 .pc_decode = nfssvc_decode_diropargs,
 720                 .pc_encode = nfssvc_encode_void,
 721                 .pc_argsize = sizeof(struct nfsd_diropargs),
 722                 .pc_ressize = sizeof(struct nfsd_void),
 723                 .pc_cachetype = RC_REPLSTAT,
 724                 .pc_xdrressize = ST,
 725         },
 726         [NFSPROC_READDIR] = {
 727                 .pc_func = nfsd_proc_readdir,
 728                 .pc_decode = nfssvc_decode_readdirargs,
 729                 .pc_encode = nfssvc_encode_readdirres,
 730                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 731                 .pc_ressize = sizeof(struct nfsd_readdirres),
 732                 .pc_cachetype = RC_NOCACHE,
 733         },
 734         [NFSPROC_STATFS] = {
 735                 .pc_func = nfsd_proc_statfs,
 736                 .pc_decode = nfssvc_decode_fhandle,
 737                 .pc_encode = nfssvc_encode_statfsres,
 738                 .pc_argsize = sizeof(struct nfsd_fhandle),
 739                 .pc_ressize = sizeof(struct nfsd_statfsres),
 740                 .pc_cachetype = RC_NOCACHE,
 741                 .pc_xdrressize = ST+5,
 742         },
 743 };
 744
 745
 746 static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
 747 const struct svc_version nfsd_version2 = {
 748         .vs_vers        = 2,
 749         .vs_nproc       = 18,
 750         .vs_proc        = nfsd_procedures2,
 751         .vs_count       = nfsd_count2,
 752         .vs_dispatch    = nfsd_dispatch,
 753         .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 754 };
 755
 756 /*
 757  * Map errnos to NFS errnos.
 758  */
 759 __be32
 760 nfserrno (int errno)
 761 {
 762         static struct {
 763                 __be32  nfserr;
 764                 int     syserr;
 765         } nfs_errtbl[] = {
 766                 { nfs_ok, 0 },
 767                 { nfserr_perm, -EPERM },
 768                 { nfserr_noent, -ENOENT },
 769                 { nfserr_io, -EIO },
 770                 { nfserr_nxio, -ENXIO },
 771                 { nfserr_fbig, -E2BIG },
 772                 { nfserr_acces, -EACCES },
 773                 { nfserr_exist, -EEXIST },
 774                 { nfserr_xdev, -EXDEV },
 775                 { nfserr_mlink, -EMLINK },
 776                 { nfserr_nodev, -ENODEV },
 777                 { nfserr_notdir, -ENOTDIR },
 778                 { nfserr_isdir, -EISDIR },
 779                 { nfserr_inval, -EINVAL },
 780                 { nfserr_fbig, -EFBIG },
 781                 { nfserr_nospc, -ENOSPC },
 782                 { nfserr_rofs, -EROFS },
 783                 { nfserr_mlink, -EMLINK },
 784                 { nfserr_nametoolong, -ENAMETOOLONG },
 785                 { nfserr_notempty, -ENOTEMPTY },
 786 #ifdef EDQUOT
 787                 { nfserr_dquot, -EDQUOT },
 788 #endif
 789                 { nfserr_stale, -ESTALE },
 790                 { nfserr_jukebox, -ETIMEDOUT },
 791                 { nfserr_jukebox, -ERESTARTSYS },
 792                 { nfserr_jukebox, -EAGAIN },
 793                 { nfserr_jukebox, -EWOULDBLOCK },
 794                 { nfserr_jukebox, -ENOMEM },
 795                 { nfserr_io, -ETXTBSY },
 796                 { nfserr_notsupp, -EOPNOTSUPP },
 797                 { nfserr_toosmall, -ETOOSMALL },
 798                 { nfserr_serverfault, -ESERVERFAULT },
 799                 { nfserr_serverfault, -ENFILE },
 800                 { nfserr_io, -EUCLEAN },
 801                 { nfserr_perm, -ENOKEY },
 802         };
 803         int     i;
 804
 805         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 806                 if (nfs_errtbl[i].syserr == errno)
 807                         return nfs_errtbl[i].nfserr;
 808         }
 809         WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
 810         return nfserr_io;
 811 }
 812