root/fs/nfsd/nfsproc.c

DEFINITIONS

1. nfsd_proc_null
2. nfsd_return_attrs
3. nfsd_return_dirop
4. nfsd_proc_getattr
5. nfsd_proc_setattr
6. nfsd_proc_lookup
7. nfsd_proc_readlink
8. nfsd_proc_read
9. nfsd_proc_write
10. nfsd_proc_create
11. nfsd_proc_remove
12. nfsd_proc_rename
13. nfsd_proc_link
14. nfsd_proc_symlink
15. nfsd_proc_mkdir
16. nfsd_proc_rmdir
17. nfsd_proc_readdir
18. nfsd_proc_statfs
19. nfserrno

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