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