fs/nfsd/nfsproc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Process version 2 NFS requests.
   4  *
   5  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   6  */
   7
   8 #include <linux/namei.h>
   9
  10 #include "cache.h"
  11 #include "xdr.h"
  12 #include "vfs.h"
  13
  14 typedef struct svc_rqst svc_rqst;
  15 typedef struct svc_buf  svc_buf;
  16
  17 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  18
  19
  20 static __be32
  21 nfsd_proc_null(struct svc_rqst *rqstp)
  22 {
  23         return nfs_ok;
  24 }
  25
  26 static __be32
  27 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
  28 {
  29         if (err) return err;
  30         return fh_getattr(&resp->fh, &resp->stat);
  31 }
  32 static __be32
  33 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
  34 {
  35         if (err) return err;
  36         return fh_getattr(&resp->fh, &resp->stat);
  37 }
  38 /*
  39  * Get a file's attributes
  40  * N.B. After this call resp->fh needs an fh_put
  41  */
  42 static __be32
  43 nfsd_proc_getattr(struct svc_rqst *rqstp)
  44 {
  45         struct nfsd_fhandle *argp = rqstp->rq_argp;
  46         struct nfsd_attrstat *resp = rqstp->rq_resp;
  47         __be32 nfserr;
  48         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  49
  50         fh_copy(&resp->fh, &argp->fh);
  51         nfserr = fh_verify(rqstp, &resp->fh, 0,
  52                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  53         return nfsd_return_attrs(nfserr, resp);
  54 }
  55
  56 /*
  57  * Set a file's attributes
  58  * N.B. After this call resp->fh needs an fh_put
  59  */
  60 static __be32
  61 nfsd_proc_setattr(struct svc_rqst *rqstp)
  62 {
  63         struct nfsd_sattrargs *argp = rqstp->rq_argp;
  64         struct nfsd_attrstat *resp = rqstp->rq_resp;
  65         struct iattr *iap = &argp->attrs;
  66         struct svc_fh *fhp;
  67         __be32 nfserr;
  68
  69         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  70                 SVCFH_fmt(&argp->fh),
  71                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  72
  73         fhp = fh_copy(&resp->fh, &argp->fh);
  74
  75         /*
  76          * NFSv2 does not differentiate between "set-[ac]time-to-now"
  77          * which only requires access, and "set-[ac]time-to-X" which
  78          * requires ownership.
  79          * So if it looks like it might be "set both to the same time which
  80          * is close to now", and if setattr_prepare fails, then we
  81          * convert to "set to now" instead of "set to explicit time"
  82          *
  83          * We only call setattr_prepare as the last test as technically
  84          * it is not an interface that we should be using.
  85          */
  86 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
  87 #define MAX_TOUCH_TIME_ERROR (30*60)
  88         if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
  89             iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
  90                 /*
  91                  * Looks probable.
  92                  *
  93                  * Now just make sure time is in the right ballpark.
  94                  * Solaris, at least, doesn't seem to care what the time
  95                  * request is.  We require it be within 30 minutes of now.
  96                  */
  97                 time_t delta = iap->ia_atime.tv_sec - get_seconds();
  98
  99                 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
 100                 if (nfserr)
 101                         goto done;
 102
 103                 if (delta < 0)
 104                         delta = -delta;
 105                 if (delta < MAX_TOUCH_TIME_ERROR &&
 106                     setattr_prepare(fhp->fh_dentry, iap) != 0) {
 107                         /*
 108                          * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
 109                          * This will cause notify_change to set these times
 110                          * to "now"
 111                          */
 112                         iap->ia_valid &= ~BOTH_TIME_SET;
 113                 }
 114         }
 115
 116         nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
 117 done:
 118         return nfsd_return_attrs(nfserr, resp);
 119 }
 120
 121 /*
 122  * Look up a path name component
 123  * Note: the dentry in the resp->fh may be negative if the file
 124  * doesn't exist yet.
 125  * N.B. After this call resp->fh needs an fh_put
 126  */
 127 static __be32
 128 nfsd_proc_lookup(struct svc_rqst *rqstp)
 129 {
 130         struct nfsd_diropargs *argp = rqstp->rq_argp;
 131         struct nfsd_diropres *resp = rqstp->rq_resp;
 132         __be32  nfserr;
 133
 134         dprintk("nfsd: LOOKUP   %s %.*s\n",
 135                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 136
 137         fh_init(&resp->fh, NFS_FHSIZE);
 138         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 139                                  &resp->fh);
 140
 141         fh_put(&argp->fh);
 142         return nfsd_return_dirop(nfserr, resp);
 143 }
 144
 145 /*
 146  * Read a symlink.
 147  */
 148 static __be32
 149 nfsd_proc_readlink(struct svc_rqst *rqstp)
 150 {
 151         struct nfsd_readlinkargs *argp = rqstp->rq_argp;
 152         struct nfsd_readlinkres *resp = rqstp->rq_resp;
 153         __be32  nfserr;
 154
 155         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 156
 157         /* Read the symlink. */
 158         resp->len = NFS_MAXPATHLEN;
 159         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 160
 161         fh_put(&argp->fh);
 162         return nfserr;
 163 }
 164
 165 /*
 166  * Read a portion of a file.
 167  * N.B. After this call resp->fh needs an fh_put
 168  */
 169 static __be32
 170 nfsd_proc_read(struct svc_rqst *rqstp)
 171 {
 172         struct nfsd_readargs *argp = rqstp->rq_argp;
 173         struct nfsd_readres *resp = rqstp->rq_resp;
 174         __be32  nfserr;
 175
 176         dprintk("nfsd: READ    %s %d bytes at %d\n",
 177                 SVCFH_fmt(&argp->fh),
 178                 argp->count, argp->offset);
 179
 180         /* Obtain buffer pointer for payload. 19 is 1 word for
 181          * status, 17 words for fattr, and 1 word for the byte count.
 182          */
 183
 184         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 185                 char buf[RPC_MAX_ADDRBUFLEN];
 186                 printk(KERN_NOTICE
 187                         "oversized read request from %s (%d bytes)\n",
 188                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 189                                 argp->count);
 190                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 191         }
 192         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 193
 194         resp->count = argp->count;
 195         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 196                                   argp->offset,
 197                                   rqstp->rq_vec, argp->vlen,
 198                                   &resp->count);
 199
 200         if (nfserr) return nfserr;
 201         return fh_getattr(&resp->fh, &resp->stat);
 202 }
 203
 204 /*
 205  * Write data to a file
 206  * N.B. After this call resp->fh needs an fh_put
 207  */
 208 static __be32
 209 nfsd_proc_write(struct svc_rqst *rqstp)
 210 {
 211         struct nfsd_writeargs *argp = rqstp->rq_argp;
 212         struct nfsd_attrstat *resp = rqstp->rq_resp;
 213         __be32  nfserr;
 214         unsigned long cnt = argp->len;
 215
 216         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 217                 SVCFH_fmt(&argp->fh),
 218                 argp->len, argp->offset);
 219
 220         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), argp->offset,
 221                                 rqstp->rq_vec, argp->vlen, &cnt, NFS_DATA_SYNC);
 222         return nfsd_return_attrs(nfserr, resp);
 223 }
 224
 225 /*
 226  * CREATE processing is complicated. The keyword here is `overloaded.'
 227  * The parent directory is kept locked between the check for existence
 228  * and the actual create() call in compliance with VFS protocols.
 229  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 230  */
 231 static __be32
 232 nfsd_proc_create(struct svc_rqst *rqstp)
 233 {
 234         struct nfsd_createargs *argp = rqstp->rq_argp;
 235         struct nfsd_diropres *resp = rqstp->rq_resp;
 236         svc_fh          *dirfhp = &argp->fh;
 237         svc_fh          *newfhp = &resp->fh;
 238         struct iattr    *attr = &argp->attrs;
 239         struct inode    *inode;
 240         struct dentry   *dchild;
 241         int             type, mode;
 242         __be32          nfserr;
 243         int             hosterr;
 244         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 245
 246         dprintk("nfsd: CREATE   %s %.*s\n",
 247                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 248
 249         /* First verify the parent file handle */
 250         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 251         if (nfserr)
 252                 goto done; /* must fh_put dirfhp even on error */
 253
 254         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 255
 256         nfserr = nfserr_exist;
 257         if (isdotent(argp->name, argp->len))
 258                 goto done;
 259         hosterr = fh_want_write(dirfhp);
 260         if (hosterr) {
 261                 nfserr = nfserrno(hosterr);
 262                 goto done;
 263         }
 264
 265         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 266         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 267         if (IS_ERR(dchild)) {
 268                 nfserr = nfserrno(PTR_ERR(dchild));
 269                 goto out_unlock;
 270         }
 271         fh_init(newfhp, NFS_FHSIZE);
 272         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 273         if (!nfserr && d_really_is_negative(dchild))
 274                 nfserr = nfserr_noent;
 275         dput(dchild);
 276         if (nfserr) {
 277                 if (nfserr != nfserr_noent)
 278                         goto out_unlock;
 279                 /*
 280                  * If the new file handle wasn't verified, we can't tell
 281                  * whether the file exists or not. Time to bail ...
 282                  */
 283                 nfserr = nfserr_acces;
 284                 if (!newfhp->fh_dentry) {
 285                         printk(KERN_WARNING
 286                                 "nfsd_proc_create: file handle not verified\n");
 287                         goto out_unlock;
 288                 }
 289         }
 290
 291         inode = d_inode(newfhp->fh_dentry);
 292
 293         /* Unfudge the mode bits */
 294         if (attr->ia_valid & ATTR_MODE) {
 295                 type = attr->ia_mode & S_IFMT;
 296                 mode = attr->ia_mode & ~S_IFMT;
 297                 if (!type) {
 298                         /* no type, so if target exists, assume same as that,
 299                          * else assume a file */
 300                         if (inode) {
 301                                 type = inode->i_mode & S_IFMT;
 302                                 switch(type) {
 303                                 case S_IFCHR:
 304                                 case S_IFBLK:
 305                                         /* reserve rdev for later checking */
 306                                         rdev = inode->i_rdev;
 307                                         attr->ia_valid |= ATTR_SIZE;
 308
 309                                         /* FALLTHROUGH */
 310                                 case S_IFIFO:
 311                                         /* this is probably a permission check..
 312                                          * at least IRIX implements perm checking on
 313                                          *   echo thing > device-special-file-or-pipe
 314                                          * by doing a CREATE with type==0
 315                                          */
 316                                         nfserr = nfsd_permission(rqstp,
 317                                                                  newfhp->fh_export,
 318                                                                  newfhp->fh_dentry,
 319                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 320                                         if (nfserr && nfserr != nfserr_rofs)
 321                                                 goto out_unlock;
 322                                 }
 323                         } else
 324                                 type = S_IFREG;
 325                 }
 326         } else if (inode) {
 327                 type = inode->i_mode & S_IFMT;
 328                 mode = inode->i_mode & ~S_IFMT;
 329         } else {
 330                 type = S_IFREG;
 331                 mode = 0;       /* ??? */
 332         }
 333
 334         attr->ia_valid |= ATTR_MODE;
 335         attr->ia_mode = mode;
 336
 337         /* Special treatment for non-regular files according to the
 338          * gospel of sun micro
 339          */
 340         if (type != S_IFREG) {
 341                 if (type != S_IFBLK && type != S_IFCHR) {
 342                         rdev = 0;
 343                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 344                         /* If you think you've seen the worst, grok this. */
 345                         type = S_IFIFO;
 346                 } else {
 347                         /* Okay, char or block special */
 348                         if (!rdev)
 349                                 rdev = wanted;
 350                 }
 351
 352                 /* we've used the SIZE information, so discard it */
 353                 attr->ia_valid &= ~ATTR_SIZE;
 354
 355                 /* Make sure the type and device matches */
 356                 nfserr = nfserr_exist;
 357                 if (inode && type != (inode->i_mode & S_IFMT))
 358                         goto out_unlock;
 359         }
 360
 361         nfserr = 0;
 362         if (!inode) {
 363                 /* File doesn't exist. Create it and set attrs */
 364                 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
 365                                         argp->len, attr, type, rdev, newfhp);
 366         } else if (type == S_IFREG) {
 367                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 368                         argp->name, attr->ia_valid, (long) attr->ia_size);
 369                 /* File already exists. We ignore all attributes except
 370                  * size, so that creat() behaves exactly like
 371                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 372                  */
 373                 attr->ia_valid &= ATTR_SIZE;
 374                 if (attr->ia_valid)
 375                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 376         }
 377
 378 out_unlock:
 379         /* We don't really need to unlock, as fh_put does it. */
 380         fh_unlock(dirfhp);
 381         fh_drop_write(dirfhp);
 382 done:
 383         fh_put(dirfhp);
 384         return nfsd_return_dirop(nfserr, resp);
 385 }
 386
 387 static __be32
 388 nfsd_proc_remove(struct svc_rqst *rqstp)
 389 {
 390         struct nfsd_diropargs *argp = rqstp->rq_argp;
 391         __be32  nfserr;
 392
 393         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 394                 argp->len, argp->name);
 395
 396         /* Unlink. -SIFDIR means file must not be a directory */
 397         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 398         fh_put(&argp->fh);
 399         return nfserr;
 400 }
 401
 402 static __be32
 403 nfsd_proc_rename(struct svc_rqst *rqstp)
 404 {
 405         struct nfsd_renameargs *argp = rqstp->rq_argp;
 406         __be32  nfserr;
 407
 408         dprintk("nfsd: RENAME   %s %.*s -> \n",
 409                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 410         dprintk("nfsd:        ->  %s %.*s\n",
 411                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 412
 413         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 414                                     &argp->tfh, argp->tname, argp->tlen);
 415         fh_put(&argp->ffh);
 416         fh_put(&argp->tfh);
 417         return nfserr;
 418 }
 419
 420 static __be32
 421 nfsd_proc_link(struct svc_rqst *rqstp)
 422 {
 423         struct nfsd_linkargs *argp = rqstp->rq_argp;
 424         __be32  nfserr;
 425
 426         dprintk("nfsd: LINK     %s ->\n",
 427                 SVCFH_fmt(&argp->ffh));
 428         dprintk("nfsd:    %s %.*s\n",
 429                 SVCFH_fmt(&argp->tfh),
 430                 argp->tlen,
 431                 argp->tname);
 432
 433         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 434                                   &argp->ffh);
 435         fh_put(&argp->ffh);
 436         fh_put(&argp->tfh);
 437         return nfserr;
 438 }
 439
 440 static __be32
 441 nfsd_proc_symlink(struct svc_rqst *rqstp)
 442 {
 443         struct nfsd_symlinkargs *argp = rqstp->rq_argp;
 444         struct svc_fh   newfh;
 445         __be32          nfserr;
 446
 447         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 448                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 449                 argp->tlen, argp->tname);
 450
 451         fh_init(&newfh, NFS_FHSIZE);
 452         /*
 453          * Crazy hack: the request fits in a page, and already-decoded
 454          * attributes follow argp->tname, so it's safe to just write a
 455          * null to ensure it's null-terminated:
 456          */
 457         argp->tname[argp->tlen] = '\0';
 458         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 459                                                  argp->tname, &newfh);
 460
 461         fh_put(&argp->ffh);
 462         fh_put(&newfh);
 463         return nfserr;
 464 }
 465
 466 /*
 467  * Make directory. This operation is not idempotent.
 468  * N.B. After this call resp->fh needs an fh_put
 469  */
 470 static __be32
 471 nfsd_proc_mkdir(struct svc_rqst *rqstp)
 472 {
 473         struct nfsd_createargs *argp = rqstp->rq_argp;
 474         struct nfsd_diropres *resp = rqstp->rq_resp;
 475         __be32  nfserr;
 476
 477         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 478
 479         if (resp->fh.fh_dentry) {
 480                 printk(KERN_WARNING
 481                         "nfsd_proc_mkdir: response already verified??\n");
 482         }
 483
 484         argp->attrs.ia_valid &= ~ATTR_SIZE;
 485         fh_init(&resp->fh, NFS_FHSIZE);
 486         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 487                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 488         fh_put(&argp->fh);
 489         return nfsd_return_dirop(nfserr, resp);
 490 }
 491
 492 /*
 493  * Remove a directory
 494  */
 495 static __be32
 496 nfsd_proc_rmdir(struct svc_rqst *rqstp)
 497 {
 498         struct nfsd_diropargs *argp = rqstp->rq_argp;
 499         __be32  nfserr;
 500
 501         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 502
 503         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 504         fh_put(&argp->fh);
 505         return nfserr;
 506 }
 507
 508 /*
 509  * Read a portion of a directory.
 510  */
 511 static __be32
 512 nfsd_proc_readdir(struct svc_rqst *rqstp)
 513 {
 514         struct nfsd_readdirargs *argp = rqstp->rq_argp;
 515         struct nfsd_readdirres *resp = rqstp->rq_resp;
 516         int             count;
 517         __be32          nfserr;
 518         loff_t          offset;
 519
 520         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 521                 SVCFH_fmt(&argp->fh),
 522                 argp->count, argp->cookie);
 523
 524         /* Shrink to the client read size */
 525         count = (argp->count >> 2) - 2;
 526
 527         /* Make sure we've room for the NULL ptr & eof flag */
 528         count -= 2;
 529         if (count < 0)
 530                 count = 0;
 531
 532         resp->buffer = argp->buffer;
 533         resp->offset = NULL;
 534         resp->buflen = count;
 535         resp->common.err = nfs_ok;
 536         /* Read directory and encode entries on the fly */
 537         offset = argp->cookie;
 538         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 539                               &resp->common, nfssvc_encode_entry);
 540
 541         resp->count = resp->buffer - argp->buffer;
 542         if (resp->offset)
 543                 *resp->offset = htonl(offset);
 544
 545         fh_put(&argp->fh);
 546         return nfserr;
 547 }
 548
 549 /*
 550  * Get file system info
 551  */
 552 static __be32
 553 nfsd_proc_statfs(struct svc_rqst *rqstp)
 554 {
 555         struct nfsd_fhandle *argp = rqstp->rq_argp;
 556         struct nfsd_statfsres *resp = rqstp->rq_resp;
 557         __be32  nfserr;
 558
 559         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 560
 561         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 562                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 563         fh_put(&argp->fh);
 564         return nfserr;
 565 }
 566
 567 /*
 568  * NFSv2 Server procedures.
 569  * Only the results of non-idempotent operations are cached.
 570  */
 571 struct nfsd_void { int dummy; };
 572
 573 #define ST 1            /* status */
 574 #define FH 8            /* filehandle */
 575 #define AT 18           /* attributes */
 576
 577 static const struct svc_procedure nfsd_procedures2[18] = {
 578         [NFSPROC_NULL] = {
 579                 .pc_func = nfsd_proc_null,
 580                 .pc_decode = nfssvc_decode_void,
 581                 .pc_encode = nfssvc_encode_void,
 582                 .pc_argsize = sizeof(struct nfsd_void),
 583                 .pc_ressize = sizeof(struct nfsd_void),
 584                 .pc_cachetype = RC_NOCACHE,
 585                 .pc_xdrressize = ST,
 586         },
 587         [NFSPROC_GETATTR] = {
 588                 .pc_func = nfsd_proc_getattr,
 589                 .pc_decode = nfssvc_decode_fhandle,
 590                 .pc_encode = nfssvc_encode_attrstat,
 591                 .pc_release = nfssvc_release_fhandle,
 592                 .pc_argsize = sizeof(struct nfsd_fhandle),
 593                 .pc_ressize = sizeof(struct nfsd_attrstat),
 594                 .pc_cachetype = RC_NOCACHE,
 595                 .pc_xdrressize = ST+AT,
 596         },
 597         [NFSPROC_SETATTR] = {
 598                 .pc_func = nfsd_proc_setattr,
 599                 .pc_decode = nfssvc_decode_sattrargs,
 600                 .pc_encode = nfssvc_encode_attrstat,
 601                 .pc_release = nfssvc_release_fhandle,
 602                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 603                 .pc_ressize = sizeof(struct nfsd_attrstat),
 604                 .pc_cachetype = RC_REPLBUFF,
 605                 .pc_xdrressize = ST+AT,
 606         },
 607         [NFSPROC_ROOT] = {
 608                 .pc_decode = nfssvc_decode_void,
 609                 .pc_encode = nfssvc_encode_void,
 610                 .pc_argsize = sizeof(struct nfsd_void),
 611                 .pc_ressize = sizeof(struct nfsd_void),
 612                 .pc_cachetype = RC_NOCACHE,
 613                 .pc_xdrressize = ST,
 614         },
 615         [NFSPROC_LOOKUP] = {
 616                 .pc_func = nfsd_proc_lookup,
 617                 .pc_decode = nfssvc_decode_diropargs,
 618                 .pc_encode = nfssvc_encode_diropres,
 619                 .pc_release = nfssvc_release_fhandle,
 620                 .pc_argsize = sizeof(struct nfsd_diropargs),
 621                 .pc_ressize = sizeof(struct nfsd_diropres),
 622                 .pc_cachetype = RC_NOCACHE,
 623                 .pc_xdrressize = ST+FH+AT,
 624         },
 625         [NFSPROC_READLINK] = {
 626                 .pc_func = nfsd_proc_readlink,
 627                 .pc_decode = nfssvc_decode_readlinkargs,
 628                 .pc_encode = nfssvc_encode_readlinkres,
 629                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 630                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 631                 .pc_cachetype = RC_NOCACHE,
 632                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 633         },
 634         [NFSPROC_READ] = {
 635                 .pc_func = nfsd_proc_read,
 636                 .pc_decode = nfssvc_decode_readargs,
 637                 .pc_encode = nfssvc_encode_readres,
 638                 .pc_release = nfssvc_release_fhandle,
 639                 .pc_argsize = sizeof(struct nfsd_readargs),
 640                 .pc_ressize = sizeof(struct nfsd_readres),
 641                 .pc_cachetype = RC_NOCACHE,
 642                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 643         },
 644         [NFSPROC_WRITECACHE] = {
 645                 .pc_decode = nfssvc_decode_void,
 646                 .pc_encode = nfssvc_encode_void,
 647                 .pc_argsize = sizeof(struct nfsd_void),
 648                 .pc_ressize = sizeof(struct nfsd_void),
 649                 .pc_cachetype = RC_NOCACHE,
 650                 .pc_xdrressize = ST,
 651         },
 652         [NFSPROC_WRITE] = {
 653                 .pc_func = nfsd_proc_write,
 654                 .pc_decode = nfssvc_decode_writeargs,
 655                 .pc_encode = nfssvc_encode_attrstat,
 656                 .pc_release = nfssvc_release_fhandle,
 657                 .pc_argsize = sizeof(struct nfsd_writeargs),
 658                 .pc_ressize = sizeof(struct nfsd_attrstat),
 659                 .pc_cachetype = RC_REPLBUFF,
 660                 .pc_xdrressize = ST+AT,
 661         },
 662         [NFSPROC_CREATE] = {
 663                 .pc_func = nfsd_proc_create,
 664                 .pc_decode = nfssvc_decode_createargs,
 665                 .pc_encode = nfssvc_encode_diropres,
 666                 .pc_release = nfssvc_release_fhandle,
 667                 .pc_argsize = sizeof(struct nfsd_createargs),
 668                 .pc_ressize = sizeof(struct nfsd_diropres),
 669                 .pc_cachetype = RC_REPLBUFF,
 670                 .pc_xdrressize = ST+FH+AT,
 671         },
 672         [NFSPROC_REMOVE] = {
 673                 .pc_func = nfsd_proc_remove,
 674                 .pc_decode = nfssvc_decode_diropargs,
 675                 .pc_encode = nfssvc_encode_void,
 676                 .pc_argsize = sizeof(struct nfsd_diropargs),
 677                 .pc_ressize = sizeof(struct nfsd_void),
 678                 .pc_cachetype = RC_REPLSTAT,
 679                 .pc_xdrressize = ST,
 680         },
 681         [NFSPROC_RENAME] = {
 682                 .pc_func = nfsd_proc_rename,
 683                 .pc_decode = nfssvc_decode_renameargs,
 684                 .pc_encode = nfssvc_encode_void,
 685                 .pc_argsize = sizeof(struct nfsd_renameargs),
 686                 .pc_ressize = sizeof(struct nfsd_void),
 687                 .pc_cachetype = RC_REPLSTAT,
 688                 .pc_xdrressize = ST,
 689         },
 690         [NFSPROC_LINK] = {
 691                 .pc_func = nfsd_proc_link,
 692                 .pc_decode = nfssvc_decode_linkargs,
 693                 .pc_encode = nfssvc_encode_void,
 694                 .pc_argsize = sizeof(struct nfsd_linkargs),
 695                 .pc_ressize = sizeof(struct nfsd_void),
 696                 .pc_cachetype = RC_REPLSTAT,
 697                 .pc_xdrressize = ST,
 698         },
 699         [NFSPROC_SYMLINK] = {
 700                 .pc_func = nfsd_proc_symlink,
 701                 .pc_decode = nfssvc_decode_symlinkargs,
 702                 .pc_encode = nfssvc_encode_void,
 703                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 704                 .pc_ressize = sizeof(struct nfsd_void),
 705                 .pc_cachetype = RC_REPLSTAT,
 706                 .pc_xdrressize = ST,
 707         },
 708         [NFSPROC_MKDIR] = {
 709                 .pc_func = nfsd_proc_mkdir,
 710                 .pc_decode = nfssvc_decode_createargs,
 711                 .pc_encode = nfssvc_encode_diropres,
 712                 .pc_release = nfssvc_release_fhandle,
 713                 .pc_argsize = sizeof(struct nfsd_createargs),
 714                 .pc_ressize = sizeof(struct nfsd_diropres),
 715                 .pc_cachetype = RC_REPLBUFF,
 716                 .pc_xdrressize = ST+FH+AT,
 717         },
 718         [NFSPROC_RMDIR] = {
 719                 .pc_func = nfsd_proc_rmdir,
 720                 .pc_decode = nfssvc_decode_diropargs,
 721                 .pc_encode = nfssvc_encode_void,
 722                 .pc_argsize = sizeof(struct nfsd_diropargs),
 723                 .pc_ressize = sizeof(struct nfsd_void),
 724                 .pc_cachetype = RC_REPLSTAT,
 725                 .pc_xdrressize = ST,
 726         },
 727         [NFSPROC_READDIR] = {
 728                 .pc_func = nfsd_proc_readdir,
 729                 .pc_decode = nfssvc_decode_readdirargs,
 730                 .pc_encode = nfssvc_encode_readdirres,
 731                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 732                 .pc_ressize = sizeof(struct nfsd_readdirres),
 733                 .pc_cachetype = RC_NOCACHE,
 734         },
 735         [NFSPROC_STATFS] = {
 736                 .pc_func = nfsd_proc_statfs,
 737                 .pc_decode = nfssvc_decode_fhandle,
 738                 .pc_encode = nfssvc_encode_statfsres,
 739                 .pc_argsize = sizeof(struct nfsd_fhandle),
 740                 .pc_ressize = sizeof(struct nfsd_statfsres),
 741                 .pc_cachetype = RC_NOCACHE,
 742                 .pc_xdrressize = ST+5,
 743         },
 744 };
 745
 746
 747 static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
 748 const struct svc_version nfsd_version2 = {
 749         .vs_vers        = 2,
 750         .vs_nproc       = 18,
 751         .vs_proc        = nfsd_procedures2,
 752         .vs_count       = nfsd_count2,
 753         .vs_dispatch    = nfsd_dispatch,
 754         .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 755 };
 756
 757 /*
 758  * Map errnos to NFS errnos.
 759  */
 760 __be32
 761 nfserrno (int errno)
 762 {
 763         static struct {
 764                 __be32  nfserr;
 765                 int     syserr;
 766         } nfs_errtbl[] = {
 767                 { nfs_ok, 0 },
 768                 { nfserr_perm, -EPERM },
 769                 { nfserr_noent, -ENOENT },
 770                 { nfserr_io, -EIO },
 771                 { nfserr_nxio, -ENXIO },
 772                 { nfserr_fbig, -E2BIG },
 773                 { nfserr_acces, -EACCES },
 774                 { nfserr_exist, -EEXIST },
 775                 { nfserr_xdev, -EXDEV },
 776                 { nfserr_mlink, -EMLINK },
 777                 { nfserr_nodev, -ENODEV },
 778                 { nfserr_notdir, -ENOTDIR },
 779                 { nfserr_isdir, -EISDIR },
 780                 { nfserr_inval, -EINVAL },
 781                 { nfserr_fbig, -EFBIG },
 782                 { nfserr_nospc, -ENOSPC },
 783                 { nfserr_rofs, -EROFS },
 784                 { nfserr_mlink, -EMLINK },
 785                 { nfserr_nametoolong, -ENAMETOOLONG },
 786                 { nfserr_notempty, -ENOTEMPTY },
 787 #ifdef EDQUOT
 788                 { nfserr_dquot, -EDQUOT },
 789 #endif
 790                 { nfserr_stale, -ESTALE },
 791                 { nfserr_jukebox, -ETIMEDOUT },
 792                 { nfserr_jukebox, -ERESTARTSYS },
 793                 { nfserr_jukebox, -EAGAIN },
 794                 { nfserr_jukebox, -EWOULDBLOCK },
 795                 { nfserr_jukebox, -ENOMEM },
 796                 { nfserr_io, -ETXTBSY },
 797                 { nfserr_notsupp, -EOPNOTSUPP },
 798                 { nfserr_toosmall, -ETOOSMALL },
 799                 { nfserr_serverfault, -ESERVERFAULT },
 800                 { nfserr_serverfault, -ENFILE },
 801                 { nfserr_io, -EUCLEAN },
 802                 { nfserr_perm, -ENOKEY },
 803         };
 804         int     i;
 805
 806         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 807                 if (nfs_errtbl[i].syserr == errno)
 808                         return nfs_errtbl[i].nfserr;
 809         }
 810         WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
 811         return nfserr_io;
 812 }
 813