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Linux/fs/nfsd/nfsfh.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * NFS server file handle treatment.
  4  *
  5  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  6  * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
  7  * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
  8  * ... and again Southern-Winter 2001 to support export_operations
  9  */
 10 
 11 #include <linux/exportfs.h>
 12 
 13 #include <linux/sunrpc/svcauth_gss.h>
 14 #include "nfsd.h"
 15 #include "vfs.h"
 16 #include "auth.h"
 17 
 18 #define NFSDDBG_FACILITY                NFSDDBG_FH
 19 
 20 
 21 /*
 22  * our acceptability function.
 23  * if NOSUBTREECHECK, accept anything
 24  * if not, require that we can walk up to exp->ex_dentry
 25  * doing some checks on the 'x' bits
 26  */
 27 static int nfsd_acceptable(void *expv, struct dentry *dentry)
 28 {
 29         struct svc_export *exp = expv;
 30         int rv;
 31         struct dentry *tdentry;
 32         struct dentry *parent;
 33 
 34         if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
 35                 return 1;
 36 
 37         tdentry = dget(dentry);
 38         while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
 39                 /* make sure parents give x permission to user */
 40                 int err;
 41                 parent = dget_parent(tdentry);
 42                 err = inode_permission(d_inode(parent), MAY_EXEC);
 43                 if (err < 0) {
 44                         dput(parent);
 45                         break;
 46                 }
 47                 dput(tdentry);
 48                 tdentry = parent;
 49         }
 50         if (tdentry != exp->ex_path.dentry)
 51                 dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry);
 52         rv = (tdentry == exp->ex_path.dentry);
 53         dput(tdentry);
 54         return rv;
 55 }
 56 
 57 /* Type check. The correct error return for type mismatches does not seem to be
 58  * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
 59  * comment in the NFSv3 spec says this is incorrect (implementation notes for
 60  * the write call).
 61  */
 62 static inline __be32
 63 nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry,
 64                 umode_t requested)
 65 {
 66         umode_t mode = d_inode(dentry)->i_mode & S_IFMT;
 67 
 68         if (requested == 0) /* the caller doesn't care */
 69                 return nfs_ok;
 70         if (mode == requested) {
 71                 if (mode == S_IFDIR && !d_can_lookup(dentry)) {
 72                         WARN_ON_ONCE(1);
 73                         return nfserr_notdir;
 74                 }
 75                 return nfs_ok;
 76         }
 77         /*
 78          * v4 has an error more specific than err_notdir which we should
 79          * return in preference to err_notdir:
 80          */
 81         if (rqstp->rq_vers == 4 && mode == S_IFLNK)
 82                 return nfserr_symlink;
 83         if (requested == S_IFDIR)
 84                 return nfserr_notdir;
 85         if (mode == S_IFDIR)
 86                 return nfserr_isdir;
 87         return nfserr_inval;
 88 }
 89 
 90 static bool nfsd_originating_port_ok(struct svc_rqst *rqstp, int flags)
 91 {
 92         if (flags & NFSEXP_INSECURE_PORT)
 93                 return true;
 94         /* We don't require gss requests to use low ports: */
 95         if (rqstp->rq_cred.cr_flavor >= RPC_AUTH_GSS)
 96                 return true;
 97         return test_bit(RQ_SECURE, &rqstp->rq_flags);
 98 }
 99 
100 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
101                                           struct svc_export *exp)
102 {
103         int flags = nfsexp_flags(rqstp, exp);
104 
105         /* Check if the request originated from a secure port. */
106         if (!nfsd_originating_port_ok(rqstp, flags)) {
107                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
108                 dprintk("nfsd: request from insecure port %s!\n",
109                         svc_print_addr(rqstp, buf, sizeof(buf)));
110                 return nfserr_perm;
111         }
112 
113         /* Set user creds for this exportpoint */
114         return nfserrno(nfsd_setuser(rqstp, exp));
115 }
116 
117 static inline __be32 check_pseudo_root(struct svc_rqst *rqstp,
118         struct dentry *dentry, struct svc_export *exp)
119 {
120         if (!(exp->ex_flags & NFSEXP_V4ROOT))
121                 return nfs_ok;
122         /*
123          * v2/v3 clients have no need for the V4ROOT export--they use
124          * the mount protocl instead; also, further V4ROOT checks may be
125          * in v4-specific code, in which case v2/v3 clients could bypass
126          * them.
127          */
128         if (!nfsd_v4client(rqstp))
129                 return nfserr_stale;
130         /*
131          * We're exposing only the directories and symlinks that have to be
132          * traversed on the way to real exports:
133          */
134         if (unlikely(!d_is_dir(dentry) &&
135                      !d_is_symlink(dentry)))
136                 return nfserr_stale;
137         /*
138          * A pseudoroot export gives permission to access only one
139          * single directory; the kernel has to make another upcall
140          * before granting access to anything else under it:
141          */
142         if (unlikely(dentry != exp->ex_path.dentry))
143                 return nfserr_stale;
144         return nfs_ok;
145 }
146 
147 /*
148  * Use the given filehandle to look up the corresponding export and
149  * dentry.  On success, the results are used to set fh_export and
150  * fh_dentry.
151  */
152 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
153 {
154         struct knfsd_fh *fh = &fhp->fh_handle;
155         struct fid *fid = NULL, sfid;
156         struct svc_export *exp;
157         struct dentry *dentry;
158         int fileid_type;
159         int data_left = fh->fh_size/4;
160         __be32 error;
161 
162         error = nfserr_stale;
163         if (rqstp->rq_vers > 2)
164                 error = nfserr_badhandle;
165         if (rqstp->rq_vers == 4 && fh->fh_size == 0)
166                 return nfserr_nofilehandle;
167 
168         if (fh->fh_version == 1) {
169                 int len;
170 
171                 if (--data_left < 0)
172                         return error;
173                 if (fh->fh_auth_type != 0)
174                         return error;
175                 len = key_len(fh->fh_fsid_type) / 4;
176                 if (len == 0)
177                         return error;
178                 if  (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
179                         /* deprecated, convert to type 3 */
180                         len = key_len(FSID_ENCODE_DEV)/4;
181                         fh->fh_fsid_type = FSID_ENCODE_DEV;
182                         /*
183                          * struct knfsd_fh uses host-endian fields, which are
184                          * sometimes used to hold net-endian values. This
185                          * confuses sparse, so we must use __force here to
186                          * keep it from complaining.
187                          */
188                         fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),
189                                                         ntohl((__force __be32)fh->fh_fsid[1])));
190                         fh->fh_fsid[1] = fh->fh_fsid[2];
191                 }
192                 data_left -= len;
193                 if (data_left < 0)
194                         return error;
195                 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid);
196                 fid = (struct fid *)(fh->fh_fsid + len);
197         } else {
198                 __u32 tfh[2];
199                 dev_t xdev;
200                 ino_t xino;
201 
202                 if (fh->fh_size != NFS_FHSIZE)
203                         return error;
204                 /* assume old filehandle format */
205                 xdev = old_decode_dev(fh->ofh_xdev);
206                 xino = u32_to_ino_t(fh->ofh_xino);
207                 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
208                 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
209         }
210 
211         error = nfserr_stale;
212         if (PTR_ERR(exp) == -ENOENT)
213                 return error;
214 
215         if (IS_ERR(exp))
216                 return nfserrno(PTR_ERR(exp));
217 
218         if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
219                 /* Elevate privileges so that the lack of 'r' or 'x'
220                  * permission on some parent directory will
221                  * not stop exportfs_decode_fh from being able
222                  * to reconnect a directory into the dentry cache.
223                  * The same problem can affect "SUBTREECHECK" exports,
224                  * but as nfsd_acceptable depends on correct
225                  * access control settings being in effect, we cannot
226                  * fix that case easily.
227                  */
228                 struct cred *new = prepare_creds();
229                 if (!new) {
230                         error =  nfserrno(-ENOMEM);
231                         goto out;
232                 }
233                 new->cap_effective =
234                         cap_raise_nfsd_set(new->cap_effective,
235                                            new->cap_permitted);
236                 put_cred(override_creds(new));
237                 put_cred(new);
238         } else {
239                 error = nfsd_setuser_and_check_port(rqstp, exp);
240                 if (error)
241                         goto out;
242         }
243 
244         /*
245          * Look up the dentry using the NFS file handle.
246          */
247         error = nfserr_stale;
248         if (rqstp->rq_vers > 2)
249                 error = nfserr_badhandle;
250 
251         if (fh->fh_version != 1) {
252                 sfid.i32.ino = fh->ofh_ino;
253                 sfid.i32.gen = fh->ofh_generation;
254                 sfid.i32.parent_ino = fh->ofh_dirino;
255                 fid = &sfid;
256                 data_left = 3;
257                 if (fh->ofh_dirino == 0)
258                         fileid_type = FILEID_INO32_GEN;
259                 else
260                         fileid_type = FILEID_INO32_GEN_PARENT;
261         } else
262                 fileid_type = fh->fh_fileid_type;
263 
264         if (fileid_type == FILEID_ROOT)
265                 dentry = dget(exp->ex_path.dentry);
266         else {
267                 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
268                                 data_left, fileid_type,
269                                 nfsd_acceptable, exp);
270         }
271         if (dentry == NULL)
272                 goto out;
273         if (IS_ERR(dentry)) {
274                 if (PTR_ERR(dentry) != -EINVAL)
275                         error = nfserrno(PTR_ERR(dentry));
276                 goto out;
277         }
278 
279         if (d_is_dir(dentry) &&
280                         (dentry->d_flags & DCACHE_DISCONNECTED)) {
281                 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n",
282                                 dentry);
283         }
284 
285         fhp->fh_dentry = dentry;
286         fhp->fh_export = exp;
287         return 0;
288 out:
289         exp_put(exp);
290         return error;
291 }
292 
293 /**
294  * fh_verify - filehandle lookup and access checking
295  * @rqstp: pointer to current rpc request
296  * @fhp: filehandle to be verified
297  * @type: expected type of object pointed to by filehandle
298  * @access: type of access needed to object
299  *
300  * Look up a dentry from the on-the-wire filehandle, check the client's
301  * access to the export, and set the current task's credentials.
302  *
303  * Regardless of success or failure of fh_verify(), fh_put() should be
304  * called on @fhp when the caller is finished with the filehandle.
305  *
306  * fh_verify() may be called multiple times on a given filehandle, for
307  * example, when processing an NFSv4 compound.  The first call will look
308  * up a dentry using the on-the-wire filehandle.  Subsequent calls will
309  * skip the lookup and just perform the other checks and possibly change
310  * the current task's credentials.
311  *
312  * @type specifies the type of object expected using one of the S_IF*
313  * constants defined in include/linux/stat.h.  The caller may use zero
314  * to indicate that it doesn't care, or a negative integer to indicate
315  * that it expects something not of the given type.
316  *
317  * @access is formed from the NFSD_MAY_* constants defined in
318  * fs/nfsd/vfs.h.
319  */
320 __be32
321 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
322 {
323         struct svc_export *exp;
324         struct dentry   *dentry;
325         __be32          error;
326 
327         dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
328 
329         if (!fhp->fh_dentry) {
330                 error = nfsd_set_fh_dentry(rqstp, fhp);
331                 if (error)
332                         goto out;
333         }
334         dentry = fhp->fh_dentry;
335         exp = fhp->fh_export;
336         /*
337          * We still have to do all these permission checks, even when
338          * fh_dentry is already set:
339          *      - fh_verify may be called multiple times with different
340          *        "access" arguments (e.g. nfsd_proc_create calls
341          *        fh_verify(...,NFSD_MAY_EXEC) first, then later (in
342          *        nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
343          *      - in the NFSv4 case, the filehandle may have been filled
344          *        in by fh_compose, and given a dentry, but further
345          *        compound operations performed with that filehandle
346          *        still need permissions checks.  In the worst case, a
347          *        mountpoint crossing may have changed the export
348          *        options, and we may now need to use a different uid
349          *        (for example, if different id-squashing options are in
350          *        effect on the new filesystem).
351          */
352         error = check_pseudo_root(rqstp, dentry, exp);
353         if (error)
354                 goto out;
355 
356         error = nfsd_setuser_and_check_port(rqstp, exp);
357         if (error)
358                 goto out;
359 
360         error = nfsd_mode_check(rqstp, dentry, type);
361         if (error)
362                 goto out;
363 
364         /*
365          * pseudoflavor restrictions are not enforced on NLM,
366          * which clients virtually always use auth_sys for,
367          * even while using RPCSEC_GSS for NFS.
368          */
369         if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS)
370                 goto skip_pseudoflavor_check;
371         /*
372          * Clients may expect to be able to use auth_sys during mount,
373          * even if they use gss for everything else; see section 2.3.2
374          * of rfc 2623.
375          */
376         if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
377                         && exp->ex_path.dentry == dentry)
378                 goto skip_pseudoflavor_check;
379 
380         error = check_nfsd_access(exp, rqstp);
381         if (error)
382                 goto out;
383 
384 skip_pseudoflavor_check:
385         /* Finally, check access permissions. */
386         error = nfsd_permission(rqstp, exp, dentry, access);
387 
388         if (error) {
389                 dprintk("fh_verify: %pd2 permission failure, "
390                         "acc=%x, error=%d\n",
391                         dentry,
392                         access, ntohl(error));
393         }
394 out:
395         if (error == nfserr_stale)
396                 nfsdstats.fh_stale++;
397         return error;
398 }
399 
400 
401 /*
402  * Compose a file handle for an NFS reply.
403  *
404  * Note that when first composed, the dentry may not yet have
405  * an inode.  In this case a call to fh_update should be made
406  * before the fh goes out on the wire ...
407  */
408 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
409                 struct dentry *dentry)
410 {
411         if (dentry != exp->ex_path.dentry) {
412                 struct fid *fid = (struct fid *)
413                         (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1);
414                 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
415                 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
416 
417                 fhp->fh_handle.fh_fileid_type =
418                         exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
419                 fhp->fh_handle.fh_size += maxsize * 4;
420         } else {
421                 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
422         }
423 }
424 
425 /*
426  * for composing old style file handles
427  */
428 static inline void _fh_update_old(struct dentry *dentry,
429                                   struct svc_export *exp,
430                                   struct knfsd_fh *fh)
431 {
432         fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino);
433         fh->ofh_generation = d_inode(dentry)->i_generation;
434         if (d_is_dir(dentry) ||
435             (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
436                 fh->ofh_dirino = 0;
437 }
438 
439 static bool is_root_export(struct svc_export *exp)
440 {
441         return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
442 }
443 
444 static struct super_block *exp_sb(struct svc_export *exp)
445 {
446         return exp->ex_path.dentry->d_sb;
447 }
448 
449 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
450 {
451         switch (fsid_type) {
452         case FSID_DEV:
453                 if (!old_valid_dev(exp_sb(exp)->s_dev))
454                         return false;
455                 /* FALL THROUGH */
456         case FSID_MAJOR_MINOR:
457         case FSID_ENCODE_DEV:
458                 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
459         case FSID_NUM:
460                 return exp->ex_flags & NFSEXP_FSID;
461         case FSID_UUID8:
462         case FSID_UUID16:
463                 if (!is_root_export(exp))
464                         return false;
465                 /* fall through */
466         case FSID_UUID4_INUM:
467         case FSID_UUID16_INUM:
468                 return exp->ex_uuid != NULL;
469         }
470         return true;
471 }
472 
473 
474 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
475 {
476         u8 version;
477         u8 fsid_type;
478 retry:
479         version = 1;
480         if (ref_fh && ref_fh->fh_export == exp) {
481                 version = ref_fh->fh_handle.fh_version;
482                 fsid_type = ref_fh->fh_handle.fh_fsid_type;
483 
484                 ref_fh = NULL;
485 
486                 switch (version) {
487                 case 0xca:
488                         fsid_type = FSID_DEV;
489                         break;
490                 case 1:
491                         break;
492                 default:
493                         goto retry;
494                 }
495 
496                 /*
497                  * As the fsid -> filesystem mapping was guided by
498                  * user-space, there is no guarantee that the filesystem
499                  * actually supports that fsid type. If it doesn't we
500                  * loop around again without ref_fh set.
501                  */
502                 if (!fsid_type_ok_for_exp(fsid_type, exp))
503                         goto retry;
504         } else if (exp->ex_flags & NFSEXP_FSID) {
505                 fsid_type = FSID_NUM;
506         } else if (exp->ex_uuid) {
507                 if (fhp->fh_maxsize >= 64) {
508                         if (is_root_export(exp))
509                                 fsid_type = FSID_UUID16;
510                         else
511                                 fsid_type = FSID_UUID16_INUM;
512                 } else {
513                         if (is_root_export(exp))
514                                 fsid_type = FSID_UUID8;
515                         else
516                                 fsid_type = FSID_UUID4_INUM;
517                 }
518         } else if (!old_valid_dev(exp_sb(exp)->s_dev))
519                 /* for newer device numbers, we must use a newer fsid format */
520                 fsid_type = FSID_ENCODE_DEV;
521         else
522                 fsid_type = FSID_DEV;
523         fhp->fh_handle.fh_version = version;
524         if (version)
525                 fhp->fh_handle.fh_fsid_type = fsid_type;
526 }
527 
528 __be32
529 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
530            struct svc_fh *ref_fh)
531 {
532         /* ref_fh is a reference file handle.
533          * if it is non-null and for the same filesystem, then we should compose
534          * a filehandle which is of the same version, where possible.
535          * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
536          * Then create a 32byte filehandle using nfs_fhbase_old
537          *
538          */
539 
540         struct inode * inode = d_inode(dentry);
541         dev_t ex_dev = exp_sb(exp)->s_dev;
542 
543         dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n",
544                 MAJOR(ex_dev), MINOR(ex_dev),
545                 (long) d_inode(exp->ex_path.dentry)->i_ino,
546                 dentry,
547                 (inode ? inode->i_ino : 0));
548 
549         /* Choose filehandle version and fsid type based on
550          * the reference filehandle (if it is in the same export)
551          * or the export options.
552          */
553         set_version_and_fsid_type(fhp, exp, ref_fh);
554 
555         if (ref_fh == fhp)
556                 fh_put(ref_fh);
557 
558         if (fhp->fh_locked || fhp->fh_dentry) {
559                 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n",
560                        dentry);
561         }
562         if (fhp->fh_maxsize < NFS_FHSIZE)
563                 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n",
564                        fhp->fh_maxsize,
565                        dentry);
566 
567         fhp->fh_dentry = dget(dentry); /* our internal copy */
568         fhp->fh_export = exp_get(exp);
569 
570         if (fhp->fh_handle.fh_version == 0xca) {
571                 /* old style filehandle please */
572                 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
573                 fhp->fh_handle.fh_size = NFS_FHSIZE;
574                 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
575                 fhp->fh_handle.ofh_dev =  old_encode_dev(ex_dev);
576                 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
577                 fhp->fh_handle.ofh_xino =
578                         ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino);
579                 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
580                 if (inode)
581                         _fh_update_old(dentry, exp, &fhp->fh_handle);
582         } else {
583                 fhp->fh_handle.fh_size =
584                         key_len(fhp->fh_handle.fh_fsid_type) + 4;
585                 fhp->fh_handle.fh_auth_type = 0;
586 
587                 mk_fsid(fhp->fh_handle.fh_fsid_type,
588                         fhp->fh_handle.fh_fsid,
589                         ex_dev,
590                         d_inode(exp->ex_path.dentry)->i_ino,
591                         exp->ex_fsid, exp->ex_uuid);
592 
593                 if (inode)
594                         _fh_update(fhp, exp, dentry);
595                 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
596                         fh_put(fhp);
597                         return nfserr_opnotsupp;
598                 }
599         }
600 
601         return 0;
602 }
603 
604 /*
605  * Update file handle information after changing a dentry.
606  * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
607  */
608 __be32
609 fh_update(struct svc_fh *fhp)
610 {
611         struct dentry *dentry;
612 
613         if (!fhp->fh_dentry)
614                 goto out_bad;
615 
616         dentry = fhp->fh_dentry;
617         if (d_really_is_negative(dentry))
618                 goto out_negative;
619         if (fhp->fh_handle.fh_version != 1) {
620                 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
621         } else {
622                 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
623                         return 0;
624 
625                 _fh_update(fhp, fhp->fh_export, dentry);
626                 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
627                         return nfserr_opnotsupp;
628         }
629         return 0;
630 out_bad:
631         printk(KERN_ERR "fh_update: fh not verified!\n");
632         return nfserr_serverfault;
633 out_negative:
634         printk(KERN_ERR "fh_update: %pd2 still negative!\n",
635                 dentry);
636         return nfserr_serverfault;
637 }
638 
639 /*
640  * Release a file handle.
641  */
642 void
643 fh_put(struct svc_fh *fhp)
644 {
645         struct dentry * dentry = fhp->fh_dentry;
646         struct svc_export * exp = fhp->fh_export;
647         if (dentry) {
648                 fh_unlock(fhp);
649                 fhp->fh_dentry = NULL;
650                 dput(dentry);
651                 fh_clear_wcc(fhp);
652         }
653         fh_drop_write(fhp);
654         if (exp) {
655                 exp_put(exp);
656                 fhp->fh_export = NULL;
657         }
658         return;
659 }
660 
661 /*
662  * Shorthand for dprintk()'s
663  */
664 char * SVCFH_fmt(struct svc_fh *fhp)
665 {
666         struct knfsd_fh *fh = &fhp->fh_handle;
667 
668         static char buf[80];
669         sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
670                 fh->fh_size,
671                 fh->fh_base.fh_pad[0],
672                 fh->fh_base.fh_pad[1],
673                 fh->fh_base.fh_pad[2],
674                 fh->fh_base.fh_pad[3],
675                 fh->fh_base.fh_pad[4],
676                 fh->fh_base.fh_pad[5]);
677         return buf;
678 }
679 
680 enum fsid_source fsid_source(struct svc_fh *fhp)
681 {
682         if (fhp->fh_handle.fh_version != 1)
683                 return FSIDSOURCE_DEV;
684         switch(fhp->fh_handle.fh_fsid_type) {
685         case FSID_DEV:
686         case FSID_ENCODE_DEV:
687         case FSID_MAJOR_MINOR:
688                 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
689                         return FSIDSOURCE_DEV;
690                 break;
691         case FSID_NUM:
692                 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
693                         return FSIDSOURCE_FSID;
694                 break;
695         default:
696                 break;
697         }
698         /* either a UUID type filehandle, or the filehandle doesn't
699          * match the export.
700          */
701         if (fhp->fh_export->ex_flags & NFSEXP_FSID)
702                 return FSIDSOURCE_FSID;
703         if (fhp->fh_export->ex_uuid)
704                 return FSIDSOURCE_UUID;
705         return FSIDSOURCE_DEV;
706 }
707 

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