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TOMOYO Linux Cross Reference
Linux/fs/nfsd/nfsfh.c

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  1 /*
  2  * NFS server file handle treatment.
  3  *
  4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  5  * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
  6  * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
  7  * ... and again Southern-Winter 2001 to support export_operations
  8  */
  9 
 10 #include <linux/exportfs.h>
 11 
 12 #include <linux/sunrpc/svcauth_gss.h>
 13 #include "nfsd.h"
 14 #include "vfs.h"
 15 #include "auth.h"
 16 
 17 #define NFSDDBG_FACILITY                NFSDDBG_FH
 18 
 19 
 20 /*
 21  * our acceptability function.
 22  * if NOSUBTREECHECK, accept anything
 23  * if not, require that we can walk up to exp->ex_dentry
 24  * doing some checks on the 'x' bits
 25  */
 26 static int nfsd_acceptable(void *expv, struct dentry *dentry)
 27 {
 28         struct svc_export *exp = expv;
 29         int rv;
 30         struct dentry *tdentry;
 31         struct dentry *parent;
 32 
 33         if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
 34                 return 1;
 35 
 36         tdentry = dget(dentry);
 37         while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
 38                 /* make sure parents give x permission to user */
 39                 int err;
 40                 parent = dget_parent(tdentry);
 41                 err = inode_permission(d_inode(parent), MAY_EXEC);
 42                 if (err < 0) {
 43                         dput(parent);
 44                         break;
 45                 }
 46                 dput(tdentry);
 47                 tdentry = parent;
 48         }
 49         if (tdentry != exp->ex_path.dentry)
 50                 dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry);
 51         rv = (tdentry == exp->ex_path.dentry);
 52         dput(tdentry);
 53         return rv;
 54 }
 55 
 56 /* Type check. The correct error return for type mismatches does not seem to be
 57  * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
 58  * comment in the NFSv3 spec says this is incorrect (implementation notes for
 59  * the write call).
 60  */
 61 static inline __be32
 62 nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry,
 63                 umode_t requested)
 64 {
 65         umode_t mode = d_inode(dentry)->i_mode & S_IFMT;
 66 
 67         if (requested == 0) /* the caller doesn't care */
 68                 return nfs_ok;
 69         if (mode == requested) {
 70                 if (mode == S_IFDIR && !d_can_lookup(dentry)) {
 71                         WARN_ON_ONCE(1);
 72                         return nfserr_notdir;
 73                 }
 74                 return nfs_ok;
 75         }
 76         /*
 77          * v4 has an error more specific than err_notdir which we should
 78          * return in preference to err_notdir:
 79          */
 80         if (rqstp->rq_vers == 4 && mode == S_IFLNK)
 81                 return nfserr_symlink;
 82         if (requested == S_IFDIR)
 83                 return nfserr_notdir;
 84         if (mode == S_IFDIR)
 85                 return nfserr_isdir;
 86         return nfserr_inval;
 87 }
 88 
 89 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
 90                                           struct svc_export *exp)
 91 {
 92         int flags = nfsexp_flags(rqstp, exp);
 93 
 94         /* Check if the request originated from a secure port. */
 95         if (!test_bit(RQ_SECURE, &rqstp->rq_flags) && !(flags & NFSEXP_INSECURE_PORT)) {
 96                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 97                 dprintk("nfsd: request from insecure port %s!\n",
 98                         svc_print_addr(rqstp, buf, sizeof(buf)));
 99                 return nfserr_perm;
100         }
101 
102         /* Set user creds for this exportpoint */
103         return nfserrno(nfsd_setuser(rqstp, exp));
104 }
105 
106 static inline __be32 check_pseudo_root(struct svc_rqst *rqstp,
107         struct dentry *dentry, struct svc_export *exp)
108 {
109         if (!(exp->ex_flags & NFSEXP_V4ROOT))
110                 return nfs_ok;
111         /*
112          * v2/v3 clients have no need for the V4ROOT export--they use
113          * the mount protocl instead; also, further V4ROOT checks may be
114          * in v4-specific code, in which case v2/v3 clients could bypass
115          * them.
116          */
117         if (!nfsd_v4client(rqstp))
118                 return nfserr_stale;
119         /*
120          * We're exposing only the directories and symlinks that have to be
121          * traversed on the way to real exports:
122          */
123         if (unlikely(!d_is_dir(dentry) &&
124                      !d_is_symlink(dentry)))
125                 return nfserr_stale;
126         /*
127          * A pseudoroot export gives permission to access only one
128          * single directory; the kernel has to make another upcall
129          * before granting access to anything else under it:
130          */
131         if (unlikely(dentry != exp->ex_path.dentry))
132                 return nfserr_stale;
133         return nfs_ok;
134 }
135 
136 /*
137  * Use the given filehandle to look up the corresponding export and
138  * dentry.  On success, the results are used to set fh_export and
139  * fh_dentry.
140  */
141 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
142 {
143         struct knfsd_fh *fh = &fhp->fh_handle;
144         struct fid *fid = NULL, sfid;
145         struct svc_export *exp;
146         struct dentry *dentry;
147         int fileid_type;
148         int data_left = fh->fh_size/4;
149         __be32 error;
150 
151         error = nfserr_stale;
152         if (rqstp->rq_vers > 2)
153                 error = nfserr_badhandle;
154         if (rqstp->rq_vers == 4 && fh->fh_size == 0)
155                 return nfserr_nofilehandle;
156 
157         if (fh->fh_version == 1) {
158                 int len;
159 
160                 if (--data_left < 0)
161                         return error;
162                 if (fh->fh_auth_type != 0)
163                         return error;
164                 len = key_len(fh->fh_fsid_type) / 4;
165                 if (len == 0)
166                         return error;
167                 if  (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
168                         /* deprecated, convert to type 3 */
169                         len = key_len(FSID_ENCODE_DEV)/4;
170                         fh->fh_fsid_type = FSID_ENCODE_DEV;
171                         /*
172                          * struct knfsd_fh uses host-endian fields, which are
173                          * sometimes used to hold net-endian values. This
174                          * confuses sparse, so we must use __force here to
175                          * keep it from complaining.
176                          */
177                         fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),
178                                                         ntohl((__force __be32)fh->fh_fsid[1])));
179                         fh->fh_fsid[1] = fh->fh_fsid[2];
180                 }
181                 data_left -= len;
182                 if (data_left < 0)
183                         return error;
184                 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid);
185                 fid = (struct fid *)(fh->fh_fsid + len);
186         } else {
187                 __u32 tfh[2];
188                 dev_t xdev;
189                 ino_t xino;
190 
191                 if (fh->fh_size != NFS_FHSIZE)
192                         return error;
193                 /* assume old filehandle format */
194                 xdev = old_decode_dev(fh->ofh_xdev);
195                 xino = u32_to_ino_t(fh->ofh_xino);
196                 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
197                 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
198         }
199 
200         error = nfserr_stale;
201         if (PTR_ERR(exp) == -ENOENT)
202                 return error;
203 
204         if (IS_ERR(exp))
205                 return nfserrno(PTR_ERR(exp));
206 
207         if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
208                 /* Elevate privileges so that the lack of 'r' or 'x'
209                  * permission on some parent directory will
210                  * not stop exportfs_decode_fh from being able
211                  * to reconnect a directory into the dentry cache.
212                  * The same problem can affect "SUBTREECHECK" exports,
213                  * but as nfsd_acceptable depends on correct
214                  * access control settings being in effect, we cannot
215                  * fix that case easily.
216                  */
217                 struct cred *new = prepare_creds();
218                 if (!new) {
219                         error =  nfserrno(-ENOMEM);
220                         goto out;
221                 }
222                 new->cap_effective =
223                         cap_raise_nfsd_set(new->cap_effective,
224                                            new->cap_permitted);
225                 put_cred(override_creds(new));
226                 put_cred(new);
227         } else {
228                 error = nfsd_setuser_and_check_port(rqstp, exp);
229                 if (error)
230                         goto out;
231         }
232 
233         /*
234          * Look up the dentry using the NFS file handle.
235          */
236         error = nfserr_stale;
237         if (rqstp->rq_vers > 2)
238                 error = nfserr_badhandle;
239 
240         if (fh->fh_version != 1) {
241                 sfid.i32.ino = fh->ofh_ino;
242                 sfid.i32.gen = fh->ofh_generation;
243                 sfid.i32.parent_ino = fh->ofh_dirino;
244                 fid = &sfid;
245                 data_left = 3;
246                 if (fh->ofh_dirino == 0)
247                         fileid_type = FILEID_INO32_GEN;
248                 else
249                         fileid_type = FILEID_INO32_GEN_PARENT;
250         } else
251                 fileid_type = fh->fh_fileid_type;
252 
253         if (fileid_type == FILEID_ROOT)
254                 dentry = dget(exp->ex_path.dentry);
255         else {
256                 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
257                                 data_left, fileid_type,
258                                 nfsd_acceptable, exp);
259         }
260         if (dentry == NULL)
261                 goto out;
262         if (IS_ERR(dentry)) {
263                 if (PTR_ERR(dentry) != -EINVAL)
264                         error = nfserrno(PTR_ERR(dentry));
265                 goto out;
266         }
267 
268         if (d_is_dir(dentry) &&
269                         (dentry->d_flags & DCACHE_DISCONNECTED)) {
270                 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n",
271                                 dentry);
272         }
273 
274         fhp->fh_dentry = dentry;
275         fhp->fh_export = exp;
276         return 0;
277 out:
278         exp_put(exp);
279         return error;
280 }
281 
282 /**
283  * fh_verify - filehandle lookup and access checking
284  * @rqstp: pointer to current rpc request
285  * @fhp: filehandle to be verified
286  * @type: expected type of object pointed to by filehandle
287  * @access: type of access needed to object
288  *
289  * Look up a dentry from the on-the-wire filehandle, check the client's
290  * access to the export, and set the current task's credentials.
291  *
292  * Regardless of success or failure of fh_verify(), fh_put() should be
293  * called on @fhp when the caller is finished with the filehandle.
294  *
295  * fh_verify() may be called multiple times on a given filehandle, for
296  * example, when processing an NFSv4 compound.  The first call will look
297  * up a dentry using the on-the-wire filehandle.  Subsequent calls will
298  * skip the lookup and just perform the other checks and possibly change
299  * the current task's credentials.
300  *
301  * @type specifies the type of object expected using one of the S_IF*
302  * constants defined in include/linux/stat.h.  The caller may use zero
303  * to indicate that it doesn't care, or a negative integer to indicate
304  * that it expects something not of the given type.
305  *
306  * @access is formed from the NFSD_MAY_* constants defined in
307  * fs/nfsd/vfs.h.
308  */
309 __be32
310 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
311 {
312         struct svc_export *exp;
313         struct dentry   *dentry;
314         __be32          error;
315 
316         dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
317 
318         if (!fhp->fh_dentry) {
319                 error = nfsd_set_fh_dentry(rqstp, fhp);
320                 if (error)
321                         goto out;
322         }
323         dentry = fhp->fh_dentry;
324         exp = fhp->fh_export;
325         /*
326          * We still have to do all these permission checks, even when
327          * fh_dentry is already set:
328          *      - fh_verify may be called multiple times with different
329          *        "access" arguments (e.g. nfsd_proc_create calls
330          *        fh_verify(...,NFSD_MAY_EXEC) first, then later (in
331          *        nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
332          *      - in the NFSv4 case, the filehandle may have been filled
333          *        in by fh_compose, and given a dentry, but further
334          *        compound operations performed with that filehandle
335          *        still need permissions checks.  In the worst case, a
336          *        mountpoint crossing may have changed the export
337          *        options, and we may now need to use a different uid
338          *        (for example, if different id-squashing options are in
339          *        effect on the new filesystem).
340          */
341         error = check_pseudo_root(rqstp, dentry, exp);
342         if (error)
343                 goto out;
344 
345         error = nfsd_setuser_and_check_port(rqstp, exp);
346         if (error)
347                 goto out;
348 
349         error = nfsd_mode_check(rqstp, dentry, type);
350         if (error)
351                 goto out;
352 
353         /*
354          * pseudoflavor restrictions are not enforced on NLM,
355          * which clients virtually always use auth_sys for,
356          * even while using RPCSEC_GSS for NFS.
357          */
358         if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS)
359                 goto skip_pseudoflavor_check;
360         /*
361          * Clients may expect to be able to use auth_sys during mount,
362          * even if they use gss for everything else; see section 2.3.2
363          * of rfc 2623.
364          */
365         if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
366                         && exp->ex_path.dentry == dentry)
367                 goto skip_pseudoflavor_check;
368 
369         error = check_nfsd_access(exp, rqstp);
370         if (error)
371                 goto out;
372 
373 skip_pseudoflavor_check:
374         /* Finally, check access permissions. */
375         error = nfsd_permission(rqstp, exp, dentry, access);
376 
377         if (error) {
378                 dprintk("fh_verify: %pd2 permission failure, "
379                         "acc=%x, error=%d\n",
380                         dentry,
381                         access, ntohl(error));
382         }
383 out:
384         if (error == nfserr_stale)
385                 nfsdstats.fh_stale++;
386         return error;
387 }
388 
389 
390 /*
391  * Compose a file handle for an NFS reply.
392  *
393  * Note that when first composed, the dentry may not yet have
394  * an inode.  In this case a call to fh_update should be made
395  * before the fh goes out on the wire ...
396  */
397 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
398                 struct dentry *dentry)
399 {
400         if (dentry != exp->ex_path.dentry) {
401                 struct fid *fid = (struct fid *)
402                         (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1);
403                 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
404                 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
405 
406                 fhp->fh_handle.fh_fileid_type =
407                         exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
408                 fhp->fh_handle.fh_size += maxsize * 4;
409         } else {
410                 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
411         }
412 }
413 
414 /*
415  * for composing old style file handles
416  */
417 static inline void _fh_update_old(struct dentry *dentry,
418                                   struct svc_export *exp,
419                                   struct knfsd_fh *fh)
420 {
421         fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino);
422         fh->ofh_generation = d_inode(dentry)->i_generation;
423         if (d_is_dir(dentry) ||
424             (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
425                 fh->ofh_dirino = 0;
426 }
427 
428 static bool is_root_export(struct svc_export *exp)
429 {
430         return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
431 }
432 
433 static struct super_block *exp_sb(struct svc_export *exp)
434 {
435         return exp->ex_path.dentry->d_sb;
436 }
437 
438 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
439 {
440         switch (fsid_type) {
441         case FSID_DEV:
442                 if (!old_valid_dev(exp_sb(exp)->s_dev))
443                         return 0;
444                 /* FALL THROUGH */
445         case FSID_MAJOR_MINOR:
446         case FSID_ENCODE_DEV:
447                 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
448         case FSID_NUM:
449                 return exp->ex_flags & NFSEXP_FSID;
450         case FSID_UUID8:
451         case FSID_UUID16:
452                 if (!is_root_export(exp))
453                         return 0;
454                 /* fall through */
455         case FSID_UUID4_INUM:
456         case FSID_UUID16_INUM:
457                 return exp->ex_uuid != NULL;
458         }
459         return 1;
460 }
461 
462 
463 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
464 {
465         u8 version;
466         u8 fsid_type;
467 retry:
468         version = 1;
469         if (ref_fh && ref_fh->fh_export == exp) {
470                 version = ref_fh->fh_handle.fh_version;
471                 fsid_type = ref_fh->fh_handle.fh_fsid_type;
472 
473                 ref_fh = NULL;
474 
475                 switch (version) {
476                 case 0xca:
477                         fsid_type = FSID_DEV;
478                         break;
479                 case 1:
480                         break;
481                 default:
482                         goto retry;
483                 }
484 
485                 /*
486                  * As the fsid -> filesystem mapping was guided by
487                  * user-space, there is no guarantee that the filesystem
488                  * actually supports that fsid type. If it doesn't we
489                  * loop around again without ref_fh set.
490                  */
491                 if (!fsid_type_ok_for_exp(fsid_type, exp))
492                         goto retry;
493         } else if (exp->ex_flags & NFSEXP_FSID) {
494                 fsid_type = FSID_NUM;
495         } else if (exp->ex_uuid) {
496                 if (fhp->fh_maxsize >= 64) {
497                         if (is_root_export(exp))
498                                 fsid_type = FSID_UUID16;
499                         else
500                                 fsid_type = FSID_UUID16_INUM;
501                 } else {
502                         if (is_root_export(exp))
503                                 fsid_type = FSID_UUID8;
504                         else
505                                 fsid_type = FSID_UUID4_INUM;
506                 }
507         } else if (!old_valid_dev(exp_sb(exp)->s_dev))
508                 /* for newer device numbers, we must use a newer fsid format */
509                 fsid_type = FSID_ENCODE_DEV;
510         else
511                 fsid_type = FSID_DEV;
512         fhp->fh_handle.fh_version = version;
513         if (version)
514                 fhp->fh_handle.fh_fsid_type = fsid_type;
515 }
516 
517 __be32
518 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
519            struct svc_fh *ref_fh)
520 {
521         /* ref_fh is a reference file handle.
522          * if it is non-null and for the same filesystem, then we should compose
523          * a filehandle which is of the same version, where possible.
524          * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
525          * Then create a 32byte filehandle using nfs_fhbase_old
526          *
527          */
528 
529         struct inode * inode = d_inode(dentry);
530         dev_t ex_dev = exp_sb(exp)->s_dev;
531 
532         dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n",
533                 MAJOR(ex_dev), MINOR(ex_dev),
534                 (long) d_inode(exp->ex_path.dentry)->i_ino,
535                 dentry,
536                 (inode ? inode->i_ino : 0));
537 
538         /* Choose filehandle version and fsid type based on
539          * the reference filehandle (if it is in the same export)
540          * or the export options.
541          */
542         set_version_and_fsid_type(fhp, exp, ref_fh);
543 
544         if (ref_fh == fhp)
545                 fh_put(ref_fh);
546 
547         if (fhp->fh_locked || fhp->fh_dentry) {
548                 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n",
549                        dentry);
550         }
551         if (fhp->fh_maxsize < NFS_FHSIZE)
552                 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n",
553                        fhp->fh_maxsize,
554                        dentry);
555 
556         fhp->fh_dentry = dget(dentry); /* our internal copy */
557         fhp->fh_export = exp_get(exp);
558 
559         if (fhp->fh_handle.fh_version == 0xca) {
560                 /* old style filehandle please */
561                 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
562                 fhp->fh_handle.fh_size = NFS_FHSIZE;
563                 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
564                 fhp->fh_handle.ofh_dev =  old_encode_dev(ex_dev);
565                 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
566                 fhp->fh_handle.ofh_xino =
567                         ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino);
568                 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
569                 if (inode)
570                         _fh_update_old(dentry, exp, &fhp->fh_handle);
571         } else {
572                 fhp->fh_handle.fh_size =
573                         key_len(fhp->fh_handle.fh_fsid_type) + 4;
574                 fhp->fh_handle.fh_auth_type = 0;
575 
576                 mk_fsid(fhp->fh_handle.fh_fsid_type,
577                         fhp->fh_handle.fh_fsid,
578                         ex_dev,
579                         d_inode(exp->ex_path.dentry)->i_ino,
580                         exp->ex_fsid, exp->ex_uuid);
581 
582                 if (inode)
583                         _fh_update(fhp, exp, dentry);
584                 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
585                         fh_put(fhp);
586                         return nfserr_opnotsupp;
587                 }
588         }
589 
590         return 0;
591 }
592 
593 /*
594  * Update file handle information after changing a dentry.
595  * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
596  */
597 __be32
598 fh_update(struct svc_fh *fhp)
599 {
600         struct dentry *dentry;
601 
602         if (!fhp->fh_dentry)
603                 goto out_bad;
604 
605         dentry = fhp->fh_dentry;
606         if (d_really_is_negative(dentry))
607                 goto out_negative;
608         if (fhp->fh_handle.fh_version != 1) {
609                 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
610         } else {
611                 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
612                         return 0;
613 
614                 _fh_update(fhp, fhp->fh_export, dentry);
615                 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
616                         return nfserr_opnotsupp;
617         }
618         return 0;
619 out_bad:
620         printk(KERN_ERR "fh_update: fh not verified!\n");
621         return nfserr_serverfault;
622 out_negative:
623         printk(KERN_ERR "fh_update: %pd2 still negative!\n",
624                 dentry);
625         return nfserr_serverfault;
626 }
627 
628 /*
629  * Release a file handle.
630  */
631 void
632 fh_put(struct svc_fh *fhp)
633 {
634         struct dentry * dentry = fhp->fh_dentry;
635         struct svc_export * exp = fhp->fh_export;
636         if (dentry) {
637                 fh_unlock(fhp);
638                 fhp->fh_dentry = NULL;
639                 dput(dentry);
640                 fh_clear_wcc(fhp);
641         }
642         fh_drop_write(fhp);
643         if (exp) {
644                 exp_put(exp);
645                 fhp->fh_export = NULL;
646         }
647         return;
648 }
649 
650 /*
651  * Shorthand for dprintk()'s
652  */
653 char * SVCFH_fmt(struct svc_fh *fhp)
654 {
655         struct knfsd_fh *fh = &fhp->fh_handle;
656 
657         static char buf[80];
658         sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
659                 fh->fh_size,
660                 fh->fh_base.fh_pad[0],
661                 fh->fh_base.fh_pad[1],
662                 fh->fh_base.fh_pad[2],
663                 fh->fh_base.fh_pad[3],
664                 fh->fh_base.fh_pad[4],
665                 fh->fh_base.fh_pad[5]);
666         return buf;
667 }
668 
669 enum fsid_source fsid_source(struct svc_fh *fhp)
670 {
671         if (fhp->fh_handle.fh_version != 1)
672                 return FSIDSOURCE_DEV;
673         switch(fhp->fh_handle.fh_fsid_type) {
674         case FSID_DEV:
675         case FSID_ENCODE_DEV:
676         case FSID_MAJOR_MINOR:
677                 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
678                         return FSIDSOURCE_DEV;
679                 break;
680         case FSID_NUM:
681                 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
682                         return FSIDSOURCE_FSID;
683                 break;
684         default:
685                 break;
686         }
687         /* either a UUID type filehandle, or the filehandle doesn't
688          * match the export.
689          */
690         if (fhp->fh_export->ex_flags & NFSEXP_FSID)
691                 return FSIDSOURCE_FSID;
692         if (fhp->fh_export->ex_uuid)
693                 return FSIDSOURCE_UUID;
694         return FSIDSOURCE_DEV;
695 }
696 

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