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