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 /* Obsolete, replaced by MNTPROC_MNT. */
 122 static __be32
 123 nfsd_proc_root(struct svc_rqst *rqstp)
 124 {
 125         return nfs_ok;
 126 }
 127
 128 /*
 129  * Look up a path name component
 130  * Note: the dentry in the resp->fh may be negative if the file
 131  * doesn't exist yet.
 132  * N.B. After this call resp->fh needs an fh_put
 133  */
 134 static __be32
 135 nfsd_proc_lookup(struct svc_rqst *rqstp)
 136 {
 137         struct nfsd_diropargs *argp = rqstp->rq_argp;
 138         struct nfsd_diropres *resp = rqstp->rq_resp;
 139         __be32  nfserr;
 140
 141         dprintk("nfsd: LOOKUP   %s %.*s\n",
 142                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 143
 144         fh_init(&resp->fh, NFS_FHSIZE);
 145         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 146                                  &resp->fh);
 147
 148         fh_put(&argp->fh);
 149         return nfsd_return_dirop(nfserr, resp);
 150 }
 151
 152 /*
 153  * Read a symlink.
 154  */
 155 static __be32
 156 nfsd_proc_readlink(struct svc_rqst *rqstp)
 157 {
 158         struct nfsd_readlinkargs *argp = rqstp->rq_argp;
 159         struct nfsd_readlinkres *resp = rqstp->rq_resp;
 160         __be32  nfserr;
 161
 162         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 163
 164         /* Read the symlink. */
 165         resp->len = NFS_MAXPATHLEN;
 166         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 167
 168         fh_put(&argp->fh);
 169         return nfserr;
 170 }
 171
 172 /*
 173  * Read a portion of a file.
 174  * N.B. After this call resp->fh needs an fh_put
 175  */
 176 static __be32
 177 nfsd_proc_read(struct svc_rqst *rqstp)
 178 {
 179         struct nfsd_readargs *argp = rqstp->rq_argp;
 180         struct nfsd_readres *resp = rqstp->rq_resp;
 181         __be32  nfserr;
 182         u32 eof;
 183
 184         dprintk("nfsd: READ    %s %d bytes at %d\n",
 185                 SVCFH_fmt(&argp->fh),
 186                 argp->count, argp->offset);
 187
 188         /* Obtain buffer pointer for payload. 19 is 1 word for
 189          * status, 17 words for fattr, and 1 word for the byte count.
 190          */
 191
 192         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
 193                 char buf[RPC_MAX_ADDRBUFLEN];
 194                 printk(KERN_NOTICE
 195                         "oversized read request from %s (%d bytes)\n",
 196                                 svc_print_addr(rqstp, buf, sizeof(buf)),
 197                                 argp->count);
 198                 argp->count = NFSSVC_MAXBLKSIZE_V2;
 199         }
 200         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 201
 202         resp->count = argp->count;
 203         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 204                                   argp->offset,
 205                                   rqstp->rq_vec, argp->vlen,
 206                                   &resp->count,
 207                                   &eof);
 208
 209         if (nfserr) return nfserr;
 210         return fh_getattr(&resp->fh, &resp->stat);
 211 }
 212
 213 /* Reserved */
 214 static __be32
 215 nfsd_proc_writecache(struct svc_rqst *rqstp)
 216 {
 217         return nfs_ok;
 218 }
 219
 220 /*
 221  * Write data to a file
 222  * N.B. After this call resp->fh needs an fh_put
 223  */
 224 static __be32
 225 nfsd_proc_write(struct svc_rqst *rqstp)
 226 {
 227         struct nfsd_writeargs *argp = rqstp->rq_argp;
 228         struct nfsd_attrstat *resp = rqstp->rq_resp;
 229         __be32  nfserr;
 230         unsigned long cnt = argp->len;
 231         unsigned int nvecs;
 232
 233         dprintk("nfsd: WRITE    %s %u bytes at %d\n",
 234                 SVCFH_fmt(&argp->fh),
 235                 argp->len, argp->offset);
 236
 237         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 238                                       &argp->first, cnt);
 239         if (!nvecs)
 240                 return nfserr_io;
 241         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
 242                             argp->offset, rqstp->rq_vec, nvecs,
 243                             &cnt, NFS_DATA_SYNC);
 244         return nfsd_return_attrs(nfserr, resp);
 245 }
 246
 247 /*
 248  * CREATE processing is complicated. The keyword here is `overloaded.'
 249  * The parent directory is kept locked between the check for existence
 250  * and the actual create() call in compliance with VFS protocols.
 251  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 252  */
 253 static __be32
 254 nfsd_proc_create(struct svc_rqst *rqstp)
 255 {
 256         struct nfsd_createargs *argp = rqstp->rq_argp;
 257         struct nfsd_diropres *resp = rqstp->rq_resp;
 258         svc_fh          *dirfhp = &argp->fh;
 259         svc_fh          *newfhp = &resp->fh;
 260         struct iattr    *attr = &argp->attrs;
 261         struct inode    *inode;
 262         struct dentry   *dchild;
 263         int             type, mode;
 264         __be32          nfserr;
 265         int             hosterr;
 266         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 267
 268         dprintk("nfsd: CREATE   %s %.*s\n",
 269                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 270
 271         /* First verify the parent file handle */
 272         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 273         if (nfserr)
 274                 goto done; /* must fh_put dirfhp even on error */
 275
 276         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 277
 278         nfserr = nfserr_exist;
 279         if (isdotent(argp->name, argp->len))
 280                 goto done;
 281         hosterr = fh_want_write(dirfhp);
 282         if (hosterr) {
 283                 nfserr = nfserrno(hosterr);
 284                 goto done;
 285         }
 286
 287         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
 288         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 289         if (IS_ERR(dchild)) {
 290                 nfserr = nfserrno(PTR_ERR(dchild));
 291                 goto out_unlock;
 292         }
 293         fh_init(newfhp, NFS_FHSIZE);
 294         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 295         if (!nfserr && d_really_is_negative(dchild))
 296                 nfserr = nfserr_noent;
 297         dput(dchild);
 298         if (nfserr) {
 299                 if (nfserr != nfserr_noent)
 300                         goto out_unlock;
 301                 /*
 302                  * If the new file handle wasn't verified, we can't tell
 303                  * whether the file exists or not. Time to bail ...
 304                  */
 305                 nfserr = nfserr_acces;
 306                 if (!newfhp->fh_dentry) {
 307                         printk(KERN_WARNING
 308                                 "nfsd_proc_create: file handle not verified\n");
 309                         goto out_unlock;
 310                 }
 311         }
 312
 313         inode = d_inode(newfhp->fh_dentry);
 314
 315         /* Unfudge the mode bits */
 316         if (attr->ia_valid & ATTR_MODE) {
 317                 type = attr->ia_mode & S_IFMT;
 318                 mode = attr->ia_mode & ~S_IFMT;
 319                 if (!type) {
 320                         /* no type, so if target exists, assume same as that,
 321                          * else assume a file */
 322                         if (inode) {
 323                                 type = inode->i_mode & S_IFMT;
 324                                 switch(type) {
 325                                 case S_IFCHR:
 326                                 case S_IFBLK:
 327                                         /* reserve rdev for later checking */
 328                                         rdev = inode->i_rdev;
 329                                         attr->ia_valid |= ATTR_SIZE;
 330
 331                                         /* FALLTHROUGH */
 332                                 case S_IFIFO:
 333                                         /* this is probably a permission check..
 334                                          * at least IRIX implements perm checking on
 335                                          *   echo thing > device-special-file-or-pipe
 336                                          * by doing a CREATE with type==0
 337                                          */
 338                                         nfserr = nfsd_permission(rqstp,
 339                                                                  newfhp->fh_export,
 340                                                                  newfhp->fh_dentry,
 341                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 342                                         if (nfserr && nfserr != nfserr_rofs)
 343                                                 goto out_unlock;
 344                                 }
 345                         } else
 346                                 type = S_IFREG;
 347                 }
 348         } else if (inode) {
 349                 type = inode->i_mode & S_IFMT;
 350                 mode = inode->i_mode & ~S_IFMT;
 351         } else {
 352                 type = S_IFREG;
 353                 mode = 0;       /* ??? */
 354         }
 355
 356         attr->ia_valid |= ATTR_MODE;
 357         attr->ia_mode = mode;
 358
 359         /* Special treatment for non-regular files according to the
 360          * gospel of sun micro
 361          */
 362         if (type != S_IFREG) {
 363                 if (type != S_IFBLK && type != S_IFCHR) {
 364                         rdev = 0;
 365                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 366                         /* If you think you've seen the worst, grok this. */
 367                         type = S_IFIFO;
 368                 } else {
 369                         /* Okay, char or block special */
 370                         if (!rdev)
 371                                 rdev = wanted;
 372                 }
 373
 374                 /* we've used the SIZE information, so discard it */
 375                 attr->ia_valid &= ~ATTR_SIZE;
 376
 377                 /* Make sure the type and device matches */
 378                 nfserr = nfserr_exist;
 379                 if (inode && type != (inode->i_mode & S_IFMT))
 380                         goto out_unlock;
 381         }
 382
 383         nfserr = 0;
 384         if (!inode) {
 385                 /* File doesn't exist. Create it and set attrs */
 386                 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
 387                                         argp->len, attr, type, rdev, newfhp);
 388         } else if (type == S_IFREG) {
 389                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 390                         argp->name, attr->ia_valid, (long) attr->ia_size);
 391                 /* File already exists. We ignore all attributes except
 392                  * size, so that creat() behaves exactly like
 393                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 394                  */
 395                 attr->ia_valid &= ATTR_SIZE;
 396                 if (attr->ia_valid)
 397                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
 398         }
 399
 400 out_unlock:
 401         /* We don't really need to unlock, as fh_put does it. */
 402         fh_unlock(dirfhp);
 403         fh_drop_write(dirfhp);
 404 done:
 405         fh_put(dirfhp);
 406         return nfsd_return_dirop(nfserr, resp);
 407 }
 408
 409 static __be32
 410 nfsd_proc_remove(struct svc_rqst *rqstp)
 411 {
 412         struct nfsd_diropargs *argp = rqstp->rq_argp;
 413         __be32  nfserr;
 414
 415         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 416                 argp->len, argp->name);
 417
 418         /* Unlink. -SIFDIR means file must not be a directory */
 419         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
 420         fh_put(&argp->fh);
 421         return nfserr;
 422 }
 423
 424 static __be32
 425 nfsd_proc_rename(struct svc_rqst *rqstp)
 426 {
 427         struct nfsd_renameargs *argp = rqstp->rq_argp;
 428         __be32  nfserr;
 429
 430         dprintk("nfsd: RENAME   %s %.*s -> \n",
 431                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 432         dprintk("nfsd:        ->  %s %.*s\n",
 433                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 434
 435         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 436                                     &argp->tfh, argp->tname, argp->tlen);
 437         fh_put(&argp->ffh);
 438         fh_put(&argp->tfh);
 439         return nfserr;
 440 }
 441
 442 static __be32
 443 nfsd_proc_link(struct svc_rqst *rqstp)
 444 {
 445         struct nfsd_linkargs *argp = rqstp->rq_argp;
 446         __be32  nfserr;
 447
 448         dprintk("nfsd: LINK     %s ->\n",
 449                 SVCFH_fmt(&argp->ffh));
 450         dprintk("nfsd:    %s %.*s\n",
 451                 SVCFH_fmt(&argp->tfh),
 452                 argp->tlen,
 453                 argp->tname);
 454
 455         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 456                                   &argp->ffh);
 457         fh_put(&argp->ffh);
 458         fh_put(&argp->tfh);
 459         return nfserr;
 460 }
 461
 462 static __be32
 463 nfsd_proc_symlink(struct svc_rqst *rqstp)
 464 {
 465         struct nfsd_symlinkargs *argp = rqstp->rq_argp;
 466         struct svc_fh   newfh;
 467         __be32          nfserr;
 468
 469         if (argp->tlen > NFS_MAXPATHLEN)
 470                 return nfserr_nametoolong;
 471
 472         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 473                                                 page_address(rqstp->rq_arg.pages[0]),
 474                                                 argp->tlen);
 475         if (IS_ERR(argp->tname))
 476                 return nfserrno(PTR_ERR(argp->tname));
 477
 478         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 479                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 480                 argp->tlen, argp->tname);
 481
 482         fh_init(&newfh, NFS_FHSIZE);
 483         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 484                                                  argp->tname, &newfh);
 485
 486         kfree(argp->tname);
 487         fh_put(&argp->ffh);
 488         fh_put(&newfh);
 489         return nfserr;
 490 }
 491
 492 /*
 493  * Make directory. This operation is not idempotent.
 494  * N.B. After this call resp->fh needs an fh_put
 495  */
 496 static __be32
 497 nfsd_proc_mkdir(struct svc_rqst *rqstp)
 498 {
 499         struct nfsd_createargs *argp = rqstp->rq_argp;
 500         struct nfsd_diropres *resp = rqstp->rq_resp;
 501         __be32  nfserr;
 502
 503         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 504
 505         if (resp->fh.fh_dentry) {
 506                 printk(KERN_WARNING
 507                         "nfsd_proc_mkdir: response already verified??\n");
 508         }
 509
 510         argp->attrs.ia_valid &= ~ATTR_SIZE;
 511         fh_init(&resp->fh, NFS_FHSIZE);
 512         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 513                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 514         fh_put(&argp->fh);
 515         return nfsd_return_dirop(nfserr, resp);
 516 }
 517
 518 /*
 519  * Remove a directory
 520  */
 521 static __be32
 522 nfsd_proc_rmdir(struct svc_rqst *rqstp)
 523 {
 524         struct nfsd_diropargs *argp = rqstp->rq_argp;
 525         __be32  nfserr;
 526
 527         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 528
 529         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
 530         fh_put(&argp->fh);
 531         return nfserr;
 532 }
 533
 534 /*
 535  * Read a portion of a directory.
 536  */
 537 static __be32
 538 nfsd_proc_readdir(struct svc_rqst *rqstp)
 539 {
 540         struct nfsd_readdirargs *argp = rqstp->rq_argp;
 541         struct nfsd_readdirres *resp = rqstp->rq_resp;
 542         int             count;
 543         __be32          nfserr;
 544         loff_t          offset;
 545
 546         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 547                 SVCFH_fmt(&argp->fh),
 548                 argp->count, argp->cookie);
 549
 550         /* Shrink to the client read size */
 551         count = (argp->count >> 2) - 2;
 552
 553         /* Make sure we've room for the NULL ptr & eof flag */
 554         count -= 2;
 555         if (count < 0)
 556                 count = 0;
 557
 558         resp->buffer = argp->buffer;
 559         resp->offset = NULL;
 560         resp->buflen = count;
 561         resp->common.err = nfs_ok;
 562         /* Read directory and encode entries on the fly */
 563         offset = argp->cookie;
 564         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
 565                               &resp->common, nfssvc_encode_entry);
 566
 567         resp->count = resp->buffer - argp->buffer;
 568         if (resp->offset)
 569                 *resp->offset = htonl(offset);
 570
 571         fh_put(&argp->fh);
 572         return nfserr;
 573 }
 574
 575 /*
 576  * Get file system info
 577  */
 578 static __be32
 579 nfsd_proc_statfs(struct svc_rqst *rqstp)
 580 {
 581         struct nfsd_fhandle *argp = rqstp->rq_argp;
 582         struct nfsd_statfsres *resp = rqstp->rq_resp;
 583         __be32  nfserr;
 584
 585         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 586
 587         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 588                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
 589         fh_put(&argp->fh);
 590         return nfserr;
 591 }
 592
 593 /*
 594  * NFSv2 Server procedures.
 595  * Only the results of non-idempotent operations are cached.
 596  */
 597 struct nfsd_void { int dummy; };
 598
 599 #define ST 1            /* status */
 600 #define FH 8            /* filehandle */
 601 #define AT 18           /* attributes */
 602
 603 static const struct svc_procedure nfsd_procedures2[18] = {
 604         [NFSPROC_NULL] = {
 605                 .pc_func = nfsd_proc_null,
 606                 .pc_decode = nfssvc_decode_void,
 607                 .pc_encode = nfssvc_encode_void,
 608                 .pc_argsize = sizeof(struct nfsd_void),
 609                 .pc_ressize = sizeof(struct nfsd_void),
 610                 .pc_cachetype = RC_NOCACHE,
 611                 .pc_xdrressize = ST,
 612         },
 613         [NFSPROC_GETATTR] = {
 614                 .pc_func = nfsd_proc_getattr,
 615                 .pc_decode = nfssvc_decode_fhandle,
 616                 .pc_encode = nfssvc_encode_attrstat,
 617                 .pc_release = nfssvc_release_fhandle,
 618                 .pc_argsize = sizeof(struct nfsd_fhandle),
 619                 .pc_ressize = sizeof(struct nfsd_attrstat),
 620                 .pc_cachetype = RC_NOCACHE,
 621                 .pc_xdrressize = ST+AT,
 622         },
 623         [NFSPROC_SETATTR] = {
 624                 .pc_func = nfsd_proc_setattr,
 625                 .pc_decode = nfssvc_decode_sattrargs,
 626                 .pc_encode = nfssvc_encode_attrstat,
 627                 .pc_release = nfssvc_release_fhandle,
 628                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 629                 .pc_ressize = sizeof(struct nfsd_attrstat),
 630                 .pc_cachetype = RC_REPLBUFF,
 631                 .pc_xdrressize = ST+AT,
 632         },
 633         [NFSPROC_ROOT] = {
 634                 .pc_func = nfsd_proc_root,
 635                 .pc_decode = nfssvc_decode_void,
 636                 .pc_encode = nfssvc_encode_void,
 637                 .pc_argsize = sizeof(struct nfsd_void),
 638                 .pc_ressize = sizeof(struct nfsd_void),
 639                 .pc_cachetype = RC_NOCACHE,
 640                 .pc_xdrressize = ST,
 641         },
 642         [NFSPROC_LOOKUP] = {
 643                 .pc_func = nfsd_proc_lookup,
 644                 .pc_decode = nfssvc_decode_diropargs,
 645                 .pc_encode = nfssvc_encode_diropres,
 646                 .pc_release = nfssvc_release_fhandle,
 647                 .pc_argsize = sizeof(struct nfsd_diropargs),
 648                 .pc_ressize = sizeof(struct nfsd_diropres),
 649                 .pc_cachetype = RC_NOCACHE,
 650                 .pc_xdrressize = ST+FH+AT,
 651         },
 652         [NFSPROC_READLINK] = {
 653                 .pc_func = nfsd_proc_readlink,
 654                 .pc_decode = nfssvc_decode_readlinkargs,
 655                 .pc_encode = nfssvc_encode_readlinkres,
 656                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 657                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 658                 .pc_cachetype = RC_NOCACHE,
 659                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 660         },
 661         [NFSPROC_READ] = {
 662                 .pc_func = nfsd_proc_read,
 663                 .pc_decode = nfssvc_decode_readargs,
 664                 .pc_encode = nfssvc_encode_readres,
 665                 .pc_release = nfssvc_release_fhandle,
 666                 .pc_argsize = sizeof(struct nfsd_readargs),
 667                 .pc_ressize = sizeof(struct nfsd_readres),
 668                 .pc_cachetype = RC_NOCACHE,
 669                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 670         },
 671         [NFSPROC_WRITECACHE] = {
 672                 .pc_func = nfsd_proc_writecache,
 673                 .pc_decode = nfssvc_decode_void,
 674                 .pc_encode = nfssvc_encode_void,
 675                 .pc_argsize = sizeof(struct nfsd_void),
 676                 .pc_ressize = sizeof(struct nfsd_void),
 677                 .pc_cachetype = RC_NOCACHE,
 678                 .pc_xdrressize = ST,
 679         },
 680         [NFSPROC_WRITE] = {
 681                 .pc_func = nfsd_proc_write,
 682                 .pc_decode = nfssvc_decode_writeargs,
 683                 .pc_encode = nfssvc_encode_attrstat,
 684                 .pc_release = nfssvc_release_fhandle,
 685                 .pc_argsize = sizeof(struct nfsd_writeargs),
 686                 .pc_ressize = sizeof(struct nfsd_attrstat),
 687                 .pc_cachetype = RC_REPLBUFF,
 688                 .pc_xdrressize = ST+AT,
 689         },
 690         [NFSPROC_CREATE] = {
 691                 .pc_func = nfsd_proc_create,
 692                 .pc_decode = nfssvc_decode_createargs,
 693                 .pc_encode = nfssvc_encode_diropres,
 694                 .pc_release = nfssvc_release_fhandle,
 695                 .pc_argsize = sizeof(struct nfsd_createargs),
 696                 .pc_ressize = sizeof(struct nfsd_diropres),
 697                 .pc_cachetype = RC_REPLBUFF,
 698                 .pc_xdrressize = ST+FH+AT,
 699         },
 700         [NFSPROC_REMOVE] = {
 701                 .pc_func = nfsd_proc_remove,
 702                 .pc_decode = nfssvc_decode_diropargs,
 703                 .pc_encode = nfssvc_encode_void,
 704                 .pc_argsize = sizeof(struct nfsd_diropargs),
 705                 .pc_ressize = sizeof(struct nfsd_void),
 706                 .pc_cachetype = RC_REPLSTAT,
 707                 .pc_xdrressize = ST,
 708         },
 709         [NFSPROC_RENAME] = {
 710                 .pc_func = nfsd_proc_rename,
 711                 .pc_decode = nfssvc_decode_renameargs,
 712                 .pc_encode = nfssvc_encode_void,
 713                 .pc_argsize = sizeof(struct nfsd_renameargs),
 714                 .pc_ressize = sizeof(struct nfsd_void),
 715                 .pc_cachetype = RC_REPLSTAT,
 716                 .pc_xdrressize = ST,
 717         },
 718         [NFSPROC_LINK] = {
 719                 .pc_func = nfsd_proc_link,
 720                 .pc_decode = nfssvc_decode_linkargs,
 721                 .pc_encode = nfssvc_encode_void,
 722                 .pc_argsize = sizeof(struct nfsd_linkargs),
 723                 .pc_ressize = sizeof(struct nfsd_void),
 724                 .pc_cachetype = RC_REPLSTAT,
 725                 .pc_xdrressize = ST,
 726         },
 727         [NFSPROC_SYMLINK] = {
 728                 .pc_func = nfsd_proc_symlink,
 729                 .pc_decode = nfssvc_decode_symlinkargs,
 730                 .pc_encode = nfssvc_encode_void,
 731                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 732                 .pc_ressize = sizeof(struct nfsd_void),
 733                 .pc_cachetype = RC_REPLSTAT,
 734                 .pc_xdrressize = ST,
 735         },
 736         [NFSPROC_MKDIR] = {
 737                 .pc_func = nfsd_proc_mkdir,
 738                 .pc_decode = nfssvc_decode_createargs,
 739                 .pc_encode = nfssvc_encode_diropres,
 740                 .pc_release = nfssvc_release_fhandle,
 741                 .pc_argsize = sizeof(struct nfsd_createargs),
 742                 .pc_ressize = sizeof(struct nfsd_diropres),
 743                 .pc_cachetype = RC_REPLBUFF,
 744                 .pc_xdrressize = ST+FH+AT,
 745         },
 746         [NFSPROC_RMDIR] = {
 747                 .pc_func = nfsd_proc_rmdir,
 748                 .pc_decode = nfssvc_decode_diropargs,
 749                 .pc_encode = nfssvc_encode_void,
 750                 .pc_argsize = sizeof(struct nfsd_diropargs),
 751                 .pc_ressize = sizeof(struct nfsd_void),
 752                 .pc_cachetype = RC_REPLSTAT,
 753                 .pc_xdrressize = ST,
 754         },
 755         [NFSPROC_READDIR] = {
 756                 .pc_func = nfsd_proc_readdir,
 757                 .pc_decode = nfssvc_decode_readdirargs,
 758                 .pc_encode = nfssvc_encode_readdirres,
 759                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 760                 .pc_ressize = sizeof(struct nfsd_readdirres),
 761                 .pc_cachetype = RC_NOCACHE,
 762         },
 763         [NFSPROC_STATFS] = {
 764                 .pc_func = nfsd_proc_statfs,
 765                 .pc_decode = nfssvc_decode_fhandle,
 766                 .pc_encode = nfssvc_encode_statfsres,
 767                 .pc_argsize = sizeof(struct nfsd_fhandle),
 768                 .pc_ressize = sizeof(struct nfsd_statfsres),
 769                 .pc_cachetype = RC_NOCACHE,
 770                 .pc_xdrressize = ST+5,
 771         },
 772 };
 773
 774
 775 static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
 776 const struct svc_version nfsd_version2 = {
 777         .vs_vers        = 2,
 778         .vs_nproc       = 18,
 779         .vs_proc        = nfsd_procedures2,
 780         .vs_count       = nfsd_count2,
 781         .vs_dispatch    = nfsd_dispatch,
 782         .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 783 };
 784
 785 /*
 786  * Map errnos to NFS errnos.
 787  */
 788 __be32
 789 nfserrno (int errno)
 790 {
 791         static struct {
 792                 __be32  nfserr;
 793                 int     syserr;
 794         } nfs_errtbl[] = {
 795                 { nfs_ok, 0 },
 796                 { nfserr_perm, -EPERM },
 797                 { nfserr_noent, -ENOENT },
 798                 { nfserr_io, -EIO },
 799                 { nfserr_nxio, -ENXIO },
 800                 { nfserr_fbig, -E2BIG },
 801                 { nfserr_acces, -EACCES },
 802                 { nfserr_exist, -EEXIST },
 803                 { nfserr_xdev, -EXDEV },
 804                 { nfserr_mlink, -EMLINK },
 805                 { nfserr_nodev, -ENODEV },
 806                 { nfserr_notdir, -ENOTDIR },
 807                 { nfserr_isdir, -EISDIR },
 808                 { nfserr_inval, -EINVAL },
 809                 { nfserr_fbig, -EFBIG },
 810                 { nfserr_nospc, -ENOSPC },
 811                 { nfserr_rofs, -EROFS },
 812                 { nfserr_mlink, -EMLINK },
 813                 { nfserr_nametoolong, -ENAMETOOLONG },
 814                 { nfserr_notempty, -ENOTEMPTY },
 815 #ifdef EDQUOT
 816                 { nfserr_dquot, -EDQUOT },
 817 #endif
 818                 { nfserr_stale, -ESTALE },
 819                 { nfserr_jukebox, -ETIMEDOUT },
 820                 { nfserr_jukebox, -ERESTARTSYS },
 821                 { nfserr_jukebox, -EAGAIN },
 822                 { nfserr_jukebox, -EWOULDBLOCK },
 823                 { nfserr_jukebox, -ENOMEM },
 824                 { nfserr_io, -ETXTBSY },
 825                 { nfserr_notsupp, -EOPNOTSUPP },
 826                 { nfserr_toosmall, -ETOOSMALL },
 827                 { nfserr_serverfault, -ESERVERFAULT },
 828                 { nfserr_serverfault, -ENFILE },
 829                 { nfserr_io, -EUCLEAN },
 830                 { nfserr_perm, -ENOKEY },
 831         };
 832         int     i;
 833
 834         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 835                 if (nfs_errtbl[i].syserr == errno)
 836                         return nfs_errtbl[i].nfserr;
 837         }
 838         WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
 839         return nfserr_io;
 840 }
 841