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 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  15
  16 static __be32
  17 nfsd_proc_null(struct svc_rqst *rqstp)
  18 {
  19         return rpc_success;
  20 }
  21
  22 /*
  23  * Get a file's attributes
  24  * N.B. After this call resp->fh needs an fh_put
  25  */
  26 static __be32
  27 nfsd_proc_getattr(struct svc_rqst *rqstp)
  28 {
  29         struct nfsd_fhandle *argp = rqstp->rq_argp;
  30         struct nfsd_attrstat *resp = rqstp->rq_resp;
  31
  32         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  33
  34         fh_copy(&resp->fh, &argp->fh);
  35         resp->status = fh_verify(rqstp, &resp->fh, 0,
  36                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  37         if (resp->status != nfs_ok)
  38                 goto out;
  39         resp->status = fh_getattr(&resp->fh, &resp->stat);
  40 out:
  41         return rpc_success;
  42 }
  43
  44 /*
  45  * Set a file's attributes
  46  * N.B. After this call resp->fh needs an fh_put
  47  */
  48 static __be32
  49 nfsd_proc_setattr(struct svc_rqst *rqstp)
  50 {
  51         struct nfsd_sattrargs *argp = rqstp->rq_argp;
  52         struct nfsd_attrstat *resp = rqstp->rq_resp;
  53         struct iattr *iap = &argp->attrs;
  54         struct svc_fh *fhp;
  55
  56         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  57                 SVCFH_fmt(&argp->fh),
  58                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  59
  60         fhp = fh_copy(&resp->fh, &argp->fh);
  61
  62         /*
  63          * NFSv2 does not differentiate between "set-[ac]time-to-now"
  64          * which only requires access, and "set-[ac]time-to-X" which
  65          * requires ownership.
  66          * So if it looks like it might be "set both to the same time which
  67          * is close to now", and if setattr_prepare fails, then we
  68          * convert to "set to now" instead of "set to explicit time"
  69          *
  70          * We only call setattr_prepare as the last test as technically
  71          * it is not an interface that we should be using.
  72          */
  73 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
  74 #define MAX_TOUCH_TIME_ERROR (30*60)
  75         if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
  76             iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
  77                 /*
  78                  * Looks probable.
  79                  *
  80                  * Now just make sure time is in the right ballpark.
  81                  * Solaris, at least, doesn't seem to care what the time
  82                  * request is.  We require it be within 30 minutes of now.
  83                  */
  84                 time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();
  85
  86                 resp->status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
  87                 if (resp->status != nfs_ok)
  88                         goto out;
  89
  90                 if (delta < 0)
  91                         delta = -delta;
  92                 if (delta < MAX_TOUCH_TIME_ERROR &&
  93                     setattr_prepare(fhp->fh_dentry, iap) != 0) {
  94                         /*
  95                          * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
  96                          * This will cause notify_change to set these times
  97                          * to "now"
  98                          */
  99                         iap->ia_valid &= ~BOTH_TIME_SET;
 100                 }
 101         }
 102
 103         resp->status = nfsd_setattr(rqstp, fhp, iap, 0, (time64_t)0);
 104         if (resp->status != nfs_ok)
 105                 goto out;
 106
 107         resp->status = fh_getattr(&resp->fh, &resp->stat);
 108 out:
 109         return rpc_success;
 110 }
 111
 112 /* Obsolete, replaced by MNTPROC_MNT. */
 113 static __be32
 114 nfsd_proc_root(struct svc_rqst *rqstp)
 115 {
 116         return rpc_success;
 117 }
 118
 119 /*
 120  * Look up a path name component
 121  * Note: the dentry in the resp->fh may be negative if the file
 122  * doesn't exist yet.
 123  * N.B. After this call resp->fh needs an fh_put
 124  */
 125 static __be32
 126 nfsd_proc_lookup(struct svc_rqst *rqstp)
 127 {
 128         struct nfsd_diropargs *argp = rqstp->rq_argp;
 129         struct nfsd_diropres *resp = rqstp->rq_resp;
 130
 131         dprintk("nfsd: LOOKUP   %s %.*s\n",
 132                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 133
 134         fh_init(&resp->fh, NFS_FHSIZE);
 135         resp->status = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 136                                    &resp->fh);
 137         fh_put(&argp->fh);
 138         if (resp->status != nfs_ok)
 139                 goto out;
 140
 141         resp->status = fh_getattr(&resp->fh, &resp->stat);
 142 out:
 143         return rpc_success;
 144 }
 145
 146 /*
 147  * Read a symlink.
 148  */
 149 static __be32
 150 nfsd_proc_readlink(struct svc_rqst *rqstp)
 151 {
 152         struct nfsd_readlinkargs *argp = rqstp->rq_argp;
 153         struct nfsd_readlinkres *resp = rqstp->rq_resp;
 154
 155         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 156
 157         /* Read the symlink. */
 158         resp->len = NFS_MAXPATHLEN;
 159         resp->status = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
 160
 161         fh_put(&argp->fh);
 162         return rpc_success;
 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         u32 eof;
 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         resp->status = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
 196                                  argp->offset,
 197                                  rqstp->rq_vec, argp->vlen,
 198                                  &resp->count,
 199                                  &eof);
 200         if (resp->status == nfs_ok)
 201                 resp->status = fh_getattr(&resp->fh, &resp->stat);
 202         else if (resp->status == nfserr_jukebox)
 203                 return rpc_drop_reply;
 204         return rpc_success;
 205 }
 206
 207 /* Reserved */
 208 static __be32
 209 nfsd_proc_writecache(struct svc_rqst *rqstp)
 210 {
 211         return rpc_success;
 212 }
 213
 214 /*
 215  * Write data to a file
 216  * N.B. After this call resp->fh needs an fh_put
 217  */
 218 static __be32
 219 nfsd_proc_write(struct svc_rqst *rqstp)
 220 {
 221         struct nfsd_writeargs *argp = rqstp->rq_argp;
 222         struct nfsd_attrstat *resp = rqstp->rq_resp;
 223         unsigned long cnt = argp->len;
 224         unsigned int nvecs;
 225
 226         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
 227                 SVCFH_fmt(&argp->fh),
 228                 argp->len, argp->offset);
 229
 230         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 231                                       &argp->first, cnt);
 232         if (!nvecs) {
 233                 resp->status = nfserr_io;
 234                 goto out;
 235         }
 236
 237         resp->status = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
 238                                   argp->offset, rqstp->rq_vec, nvecs,
 239                                   &cnt, NFS_DATA_SYNC, NULL);
 240         if (resp->status == nfs_ok)
 241                 resp->status = fh_getattr(&resp->fh, &resp->stat);
 242         else if (resp->status == nfserr_jukebox)
 243                 return rpc_drop_reply;
 244 out:
 245         return rpc_success;
 246 }
 247
 248 /*
 249  * CREATE processing is complicated. The keyword here is `overloaded.'
 250  * The parent directory is kept locked between the check for existence
 251  * and the actual create() call in compliance with VFS protocols.
 252  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 253  */
 254 static __be32
 255 nfsd_proc_create(struct svc_rqst *rqstp)
 256 {
 257         struct nfsd_createargs *argp = rqstp->rq_argp;
 258         struct nfsd_diropres *resp = rqstp->rq_resp;
 259         svc_fh          *dirfhp = &argp->fh;
 260         svc_fh          *newfhp = &resp->fh;
 261         struct iattr    *attr = &argp->attrs;
 262         struct inode    *inode;
 263         struct dentry   *dchild;
 264         int             type, mode;
 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         resp->status = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 273         if (resp->status != nfs_ok)
 274                 goto done; /* must fh_put dirfhp even on error */
 275
 276         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 277
 278         resp->status = nfserr_exist;
 279         if (isdotent(argp->name, argp->len))
 280                 goto done;
 281         hosterr = fh_want_write(dirfhp);
 282         if (hosterr) {
 283                 resp->status = 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                 resp->status = nfserrno(PTR_ERR(dchild));
 291                 goto out_unlock;
 292         }
 293         fh_init(newfhp, NFS_FHSIZE);
 294         resp->status = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 295         if (!resp->status && d_really_is_negative(dchild))
 296                 resp->status = nfserr_noent;
 297         dput(dchild);
 298         if (resp->status) {
 299                 if (resp->status != 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                 resp->status = 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                                         resp->status = nfsd_permission(rqstp,
 339                                                                  newfhp->fh_export,
 340                                                                  newfhp->fh_dentry,
 341                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 342                                         if (resp->status && resp->status != 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                 resp->status = nfserr_exist;
 379                 if (inode && type != (inode->i_mode & S_IFMT))
 380                         goto out_unlock;
 381         }
 382
 383         resp->status = nfs_ok;
 384         if (!inode) {
 385                 /* File doesn't exist. Create it and set attrs */
 386                 resp->status = nfsd_create_locked(rqstp, dirfhp, argp->name,
 387                                                   argp->len, attr, type, rdev,
 388                                                   newfhp);
 389         } else if (type == S_IFREG) {
 390                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 391                         argp->name, attr->ia_valid, (long) attr->ia_size);
 392                 /* File already exists. We ignore all attributes except
 393                  * size, so that creat() behaves exactly like
 394                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 395                  */
 396                 attr->ia_valid &= ATTR_SIZE;
 397                 if (attr->ia_valid)
 398                         resp->status = nfsd_setattr(rqstp, newfhp, attr, 0,
 399                                                     (time64_t)0);
 400         }
 401
 402 out_unlock:
 403         /* We don't really need to unlock, as fh_put does it. */
 404         fh_unlock(dirfhp);
 405         fh_drop_write(dirfhp);
 406 done:
 407         fh_put(dirfhp);
 408         if (resp->status != nfs_ok)
 409                 goto out;
 410         resp->status = fh_getattr(&resp->fh, &resp->stat);
 411 out:
 412         return rpc_success;
 413 }
 414
 415 static __be32
 416 nfsd_proc_remove(struct svc_rqst *rqstp)
 417 {
 418         struct nfsd_diropargs *argp = rqstp->rq_argp;
 419         struct nfsd_stat *resp = rqstp->rq_resp;
 420
 421         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 422                 argp->len, argp->name);
 423
 424         /* Unlink. -SIFDIR means file must not be a directory */
 425         resp->status = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR,
 426                                    argp->name, argp->len);
 427         fh_put(&argp->fh);
 428         return rpc_success;
 429 }
 430
 431 static __be32
 432 nfsd_proc_rename(struct svc_rqst *rqstp)
 433 {
 434         struct nfsd_renameargs *argp = rqstp->rq_argp;
 435         struct nfsd_stat *resp = rqstp->rq_resp;
 436
 437         dprintk("nfsd: RENAME   %s %.*s -> \n",
 438                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 439         dprintk("nfsd:        ->  %s %.*s\n",
 440                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 441
 442         resp->status = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 443                                    &argp->tfh, argp->tname, argp->tlen);
 444         fh_put(&argp->ffh);
 445         fh_put(&argp->tfh);
 446         return rpc_success;
 447 }
 448
 449 static __be32
 450 nfsd_proc_link(struct svc_rqst *rqstp)
 451 {
 452         struct nfsd_linkargs *argp = rqstp->rq_argp;
 453         struct nfsd_stat *resp = rqstp->rq_resp;
 454
 455         dprintk("nfsd: LINK     %s ->\n",
 456                 SVCFH_fmt(&argp->ffh));
 457         dprintk("nfsd:    %s %.*s\n",
 458                 SVCFH_fmt(&argp->tfh),
 459                 argp->tlen,
 460                 argp->tname);
 461
 462         resp->status = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 463                                  &argp->ffh);
 464         fh_put(&argp->ffh);
 465         fh_put(&argp->tfh);
 466         return rpc_success;
 467 }
 468
 469 static __be32
 470 nfsd_proc_symlink(struct svc_rqst *rqstp)
 471 {
 472         struct nfsd_symlinkargs *argp = rqstp->rq_argp;
 473         struct nfsd_stat *resp = rqstp->rq_resp;
 474         struct svc_fh   newfh;
 475
 476         if (argp->tlen > NFS_MAXPATHLEN) {
 477                 resp->status = nfserr_nametoolong;
 478                 goto out;
 479         }
 480
 481         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 482                                                 page_address(rqstp->rq_arg.pages[0]),
 483                                                 argp->tlen);
 484         if (IS_ERR(argp->tname)) {
 485                 resp->status = nfserrno(PTR_ERR(argp->tname));
 486                 goto out;
 487         }
 488
 489         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 490                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 491                 argp->tlen, argp->tname);
 492
 493         fh_init(&newfh, NFS_FHSIZE);
 494         resp->status = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 495                                     argp->tname, &newfh);
 496
 497         kfree(argp->tname);
 498         fh_put(&argp->ffh);
 499         fh_put(&newfh);
 500 out:
 501         return rpc_success;
 502 }
 503
 504 /*
 505  * Make directory. This operation is not idempotent.
 506  * N.B. After this call resp->fh needs an fh_put
 507  */
 508 static __be32
 509 nfsd_proc_mkdir(struct svc_rqst *rqstp)
 510 {
 511         struct nfsd_createargs *argp = rqstp->rq_argp;
 512         struct nfsd_diropres *resp = rqstp->rq_resp;
 513
 514         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 515
 516         if (resp->fh.fh_dentry) {
 517                 printk(KERN_WARNING
 518                         "nfsd_proc_mkdir: response already verified??\n");
 519         }
 520
 521         argp->attrs.ia_valid &= ~ATTR_SIZE;
 522         fh_init(&resp->fh, NFS_FHSIZE);
 523         resp->status = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 524                                    &argp->attrs, S_IFDIR, 0, &resp->fh);
 525         fh_put(&argp->fh);
 526         if (resp->status != nfs_ok)
 527                 goto out;
 528
 529         resp->status = fh_getattr(&resp->fh, &resp->stat);
 530 out:
 531         return rpc_success;
 532 }
 533
 534 /*
 535  * Remove a directory
 536  */
 537 static __be32
 538 nfsd_proc_rmdir(struct svc_rqst *rqstp)
 539 {
 540         struct nfsd_diropargs *argp = rqstp->rq_argp;
 541         struct nfsd_stat *resp = rqstp->rq_resp;
 542
 543         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 544
 545         resp->status = nfsd_unlink(rqstp, &argp->fh, S_IFDIR,
 546                                    argp->name, argp->len);
 547         fh_put(&argp->fh);
 548         return rpc_success;
 549 }
 550
 551 /*
 552  * Read a portion of a directory.
 553  */
 554 static __be32
 555 nfsd_proc_readdir(struct svc_rqst *rqstp)
 556 {
 557         struct nfsd_readdirargs *argp = rqstp->rq_argp;
 558         struct nfsd_readdirres *resp = rqstp->rq_resp;
 559         int             count;
 560         loff_t          offset;
 561
 562         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 563                 SVCFH_fmt(&argp->fh),
 564                 argp->count, argp->cookie);
 565
 566         /* Shrink to the client read size */
 567         count = (argp->count >> 2) - 2;
 568
 569         /* Make sure we've room for the NULL ptr & eof flag */
 570         count -= 2;
 571         if (count < 0)
 572                 count = 0;
 573
 574         resp->buffer = argp->buffer;
 575         resp->offset = NULL;
 576         resp->buflen = count;
 577         resp->common.err = nfs_ok;
 578         /* Read directory and encode entries on the fly */
 579         offset = argp->cookie;
 580         resp->status = nfsd_readdir(rqstp, &argp->fh, &offset,
 581                                     &resp->common, nfssvc_encode_entry);
 582
 583         resp->count = resp->buffer - argp->buffer;
 584         if (resp->offset)
 585                 *resp->offset = htonl(offset);
 586
 587         fh_put(&argp->fh);
 588         return rpc_success;
 589 }
 590
 591 /*
 592  * Get file system info
 593  */
 594 static __be32
 595 nfsd_proc_statfs(struct svc_rqst *rqstp)
 596 {
 597         struct nfsd_fhandle *argp = rqstp->rq_argp;
 598         struct nfsd_statfsres *resp = rqstp->rq_resp;
 599
 600         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 601
 602         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 603                                    NFSD_MAY_BYPASS_GSS_ON_ROOT);
 604         fh_put(&argp->fh);
 605         return rpc_success;
 606 }
 607
 608 /*
 609  * NFSv2 Server procedures.
 610  * Only the results of non-idempotent operations are cached.
 611  */
 612
 613 #define ST 1            /* status */
 614 #define FH 8            /* filehandle */
 615 #define AT 18           /* attributes */
 616
 617 static const struct svc_procedure nfsd_procedures2[18] = {
 618         [NFSPROC_NULL] = {
 619                 .pc_func = nfsd_proc_null,
 620                 .pc_decode = nfssvc_decode_voidarg,
 621                 .pc_encode = nfssvc_encode_voidres,
 622                 .pc_argsize = sizeof(struct nfsd_voidargs),
 623                 .pc_ressize = sizeof(struct nfsd_voidres),
 624                 .pc_cachetype = RC_NOCACHE,
 625                 .pc_xdrressize = 0,
 626         },
 627         [NFSPROC_GETATTR] = {
 628                 .pc_func = nfsd_proc_getattr,
 629                 .pc_decode = nfssvc_decode_fhandle,
 630                 .pc_encode = nfssvc_encode_attrstat,
 631                 .pc_release = nfssvc_release_attrstat,
 632                 .pc_argsize = sizeof(struct nfsd_fhandle),
 633                 .pc_ressize = sizeof(struct nfsd_attrstat),
 634                 .pc_cachetype = RC_NOCACHE,
 635                 .pc_xdrressize = ST+AT,
 636         },
 637         [NFSPROC_SETATTR] = {
 638                 .pc_func = nfsd_proc_setattr,
 639                 .pc_decode = nfssvc_decode_sattrargs,
 640                 .pc_encode = nfssvc_encode_attrstat,
 641                 .pc_release = nfssvc_release_attrstat,
 642                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 643                 .pc_ressize = sizeof(struct nfsd_attrstat),
 644                 .pc_cachetype = RC_REPLBUFF,
 645                 .pc_xdrressize = ST+AT,
 646         },
 647         [NFSPROC_ROOT] = {
 648                 .pc_func = nfsd_proc_root,
 649                 .pc_decode = nfssvc_decode_voidarg,
 650                 .pc_encode = nfssvc_encode_voidres,
 651                 .pc_argsize = sizeof(struct nfsd_voidargs),
 652                 .pc_ressize = sizeof(struct nfsd_voidres),
 653                 .pc_cachetype = RC_NOCACHE,
 654                 .pc_xdrressize = 0,
 655         },
 656         [NFSPROC_LOOKUP] = {
 657                 .pc_func = nfsd_proc_lookup,
 658                 .pc_decode = nfssvc_decode_diropargs,
 659                 .pc_encode = nfssvc_encode_diropres,
 660                 .pc_release = nfssvc_release_diropres,
 661                 .pc_argsize = sizeof(struct nfsd_diropargs),
 662                 .pc_ressize = sizeof(struct nfsd_diropres),
 663                 .pc_cachetype = RC_NOCACHE,
 664                 .pc_xdrressize = ST+FH+AT,
 665         },
 666         [NFSPROC_READLINK] = {
 667                 .pc_func = nfsd_proc_readlink,
 668                 .pc_decode = nfssvc_decode_readlinkargs,
 669                 .pc_encode = nfssvc_encode_readlinkres,
 670                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
 671                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 672                 .pc_cachetype = RC_NOCACHE,
 673                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 674         },
 675         [NFSPROC_READ] = {
 676                 .pc_func = nfsd_proc_read,
 677                 .pc_decode = nfssvc_decode_readargs,
 678                 .pc_encode = nfssvc_encode_readres,
 679                 .pc_release = nfssvc_release_readres,
 680                 .pc_argsize = sizeof(struct nfsd_readargs),
 681                 .pc_ressize = sizeof(struct nfsd_readres),
 682                 .pc_cachetype = RC_NOCACHE,
 683                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 684         },
 685         [NFSPROC_WRITECACHE] = {
 686                 .pc_func = nfsd_proc_writecache,
 687                 .pc_decode = nfssvc_decode_voidarg,
 688                 .pc_encode = nfssvc_encode_voidres,
 689                 .pc_argsize = sizeof(struct nfsd_voidargs),
 690                 .pc_ressize = sizeof(struct nfsd_voidres),
 691                 .pc_cachetype = RC_NOCACHE,
 692                 .pc_xdrressize = 0,
 693         },
 694         [NFSPROC_WRITE] = {
 695                 .pc_func = nfsd_proc_write,
 696                 .pc_decode = nfssvc_decode_writeargs,
 697                 .pc_encode = nfssvc_encode_attrstat,
 698                 .pc_release = nfssvc_release_attrstat,
 699                 .pc_argsize = sizeof(struct nfsd_writeargs),
 700                 .pc_ressize = sizeof(struct nfsd_attrstat),
 701                 .pc_cachetype = RC_REPLBUFF,
 702                 .pc_xdrressize = ST+AT,
 703         },
 704         [NFSPROC_CREATE] = {
 705                 .pc_func = nfsd_proc_create,
 706                 .pc_decode = nfssvc_decode_createargs,
 707                 .pc_encode = nfssvc_encode_diropres,
 708                 .pc_release = nfssvc_release_diropres,
 709                 .pc_argsize = sizeof(struct nfsd_createargs),
 710                 .pc_ressize = sizeof(struct nfsd_diropres),
 711                 .pc_cachetype = RC_REPLBUFF,
 712                 .pc_xdrressize = ST+FH+AT,
 713         },
 714         [NFSPROC_REMOVE] = {
 715                 .pc_func = nfsd_proc_remove,
 716                 .pc_decode = nfssvc_decode_diropargs,
 717                 .pc_encode = nfssvc_encode_stat,
 718                 .pc_argsize = sizeof(struct nfsd_diropargs),
 719                 .pc_ressize = sizeof(struct nfsd_stat),
 720                 .pc_cachetype = RC_REPLSTAT,
 721                 .pc_xdrressize = ST,
 722         },
 723         [NFSPROC_RENAME] = {
 724                 .pc_func = nfsd_proc_rename,
 725                 .pc_decode = nfssvc_decode_renameargs,
 726                 .pc_encode = nfssvc_encode_stat,
 727                 .pc_argsize = sizeof(struct nfsd_renameargs),
 728                 .pc_ressize = sizeof(struct nfsd_stat),
 729                 .pc_cachetype = RC_REPLSTAT,
 730                 .pc_xdrressize = ST,
 731         },
 732         [NFSPROC_LINK] = {
 733                 .pc_func = nfsd_proc_link,
 734                 .pc_decode = nfssvc_decode_linkargs,
 735                 .pc_encode = nfssvc_encode_stat,
 736                 .pc_argsize = sizeof(struct nfsd_linkargs),
 737                 .pc_ressize = sizeof(struct nfsd_stat),
 738                 .pc_cachetype = RC_REPLSTAT,
 739                 .pc_xdrressize = ST,
 740         },
 741         [NFSPROC_SYMLINK] = {
 742                 .pc_func = nfsd_proc_symlink,
 743                 .pc_decode = nfssvc_decode_symlinkargs,
 744                 .pc_encode = nfssvc_encode_stat,
 745                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 746                 .pc_ressize = sizeof(struct nfsd_stat),
 747                 .pc_cachetype = RC_REPLSTAT,
 748                 .pc_xdrressize = ST,
 749         },
 750         [NFSPROC_MKDIR] = {
 751                 .pc_func = nfsd_proc_mkdir,
 752                 .pc_decode = nfssvc_decode_createargs,
 753                 .pc_encode = nfssvc_encode_diropres,
 754                 .pc_release = nfssvc_release_diropres,
 755                 .pc_argsize = sizeof(struct nfsd_createargs),
 756                 .pc_ressize = sizeof(struct nfsd_diropres),
 757                 .pc_cachetype = RC_REPLBUFF,
 758                 .pc_xdrressize = ST+FH+AT,
 759         },
 760         [NFSPROC_RMDIR] = {
 761                 .pc_func = nfsd_proc_rmdir,
 762                 .pc_decode = nfssvc_decode_diropargs,
 763                 .pc_encode = nfssvc_encode_stat,
 764                 .pc_argsize = sizeof(struct nfsd_diropargs),
 765                 .pc_ressize = sizeof(struct nfsd_stat),
 766                 .pc_cachetype = RC_REPLSTAT,
 767                 .pc_xdrressize = ST,
 768         },
 769         [NFSPROC_READDIR] = {
 770                 .pc_func = nfsd_proc_readdir,
 771                 .pc_decode = nfssvc_decode_readdirargs,
 772                 .pc_encode = nfssvc_encode_readdirres,
 773                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 774                 .pc_ressize = sizeof(struct nfsd_readdirres),
 775                 .pc_cachetype = RC_NOCACHE,
 776         },
 777         [NFSPROC_STATFS] = {
 778                 .pc_func = nfsd_proc_statfs,
 779                 .pc_decode = nfssvc_decode_fhandle,
 780                 .pc_encode = nfssvc_encode_statfsres,
 781                 .pc_argsize = sizeof(struct nfsd_fhandle),
 782                 .pc_ressize = sizeof(struct nfsd_statfsres),
 783                 .pc_cachetype = RC_NOCACHE,
 784                 .pc_xdrressize = ST+5,
 785         },
 786 };
 787
 788
 789 static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
 790 const struct svc_version nfsd_version2 = {
 791         .vs_vers        = 2,
 792         .vs_nproc       = 18,
 793         .vs_proc        = nfsd_procedures2,
 794         .vs_count       = nfsd_count2,
 795         .vs_dispatch    = nfsd_dispatch,
 796         .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 797 };
 798
 799 /*
 800  * Map errnos to NFS errnos.
 801  */
 802 __be32
 803 nfserrno (int errno)
 804 {
 805         static struct {
 806                 __be32  nfserr;
 807                 int     syserr;
 808         } nfs_errtbl[] = {
 809                 { nfs_ok, 0 },
 810                 { nfserr_perm, -EPERM },
 811                 { nfserr_noent, -ENOENT },
 812                 { nfserr_io, -EIO },
 813                 { nfserr_nxio, -ENXIO },
 814                 { nfserr_fbig, -E2BIG },
 815                 { nfserr_acces, -EACCES },
 816                 { nfserr_exist, -EEXIST },
 817                 { nfserr_xdev, -EXDEV },
 818                 { nfserr_mlink, -EMLINK },
 819                 { nfserr_nodev, -ENODEV },
 820                 { nfserr_notdir, -ENOTDIR },
 821                 { nfserr_isdir, -EISDIR },
 822                 { nfserr_inval, -EINVAL },
 823                 { nfserr_fbig, -EFBIG },
 824                 { nfserr_nospc, -ENOSPC },
 825                 { nfserr_rofs, -EROFS },
 826                 { nfserr_mlink, -EMLINK },
 827                 { nfserr_nametoolong, -ENAMETOOLONG },
 828                 { nfserr_notempty, -ENOTEMPTY },
 829 #ifdef EDQUOT
 830                 { nfserr_dquot, -EDQUOT },
 831 #endif
 832                 { nfserr_stale, -ESTALE },
 833                 { nfserr_jukebox, -ETIMEDOUT },
 834                 { nfserr_jukebox, -ERESTARTSYS },
 835                 { nfserr_jukebox, -EAGAIN },
 836                 { nfserr_jukebox, -EWOULDBLOCK },
 837                 { nfserr_jukebox, -ENOMEM },
 838                 { nfserr_io, -ETXTBSY },
 839                 { nfserr_notsupp, -EOPNOTSUPP },
 840                 { nfserr_toosmall, -ETOOSMALL },
 841                 { nfserr_serverfault, -ESERVERFAULT },
 842                 { nfserr_serverfault, -ENFILE },
 843                 { nfserr_io, -EUCLEAN },
 844                 { nfserr_perm, -ENOKEY },
 845         };
 846         int     i;
 847
 848         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
 849                 if (nfs_errtbl[i].syserr == errno)
 850                         return nfs_errtbl[i].nfserr;
 851         }
 852         WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
 853         return nfserr_io;
 854 }
 855