2 * linux/fs/nfsd/nfsfh.c
4 * NFS server file handle treatment.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
8 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
9 * ... and again Southern-Winter 2001 to support export_operations
12 #include <linux/slab.h>
14 #include <linux/unistd.h>
15 #include <linux/string.h>
16 #include <linux/stat.h>
17 #include <linux/dcache.h>
18 #include <linux/exportfs.h>
19 #include <linux/mount.h>
21 #include <linux/sunrpc/clnt.h>
22 #include <linux/sunrpc/svc.h>
23 #include <linux/nfsd/nfsd.h>
25 #define NFSDDBG_FACILITY NFSDDBG_FH
28 static int nfsd_nr_verified
;
29 static int nfsd_nr_put
;
32 * our acceptability function.
33 * if NOSUBTREECHECK, accept anything
34 * if not, require that we can walk up to exp->ex_dentry
35 * doing some checks on the 'x' bits
37 static int nfsd_acceptable(void *expv
, struct dentry
*dentry
)
39 struct svc_export
*exp
= expv
;
41 struct dentry
*tdentry
;
42 struct dentry
*parent
;
44 if (exp
->ex_flags
& NFSEXP_NOSUBTREECHECK
)
47 tdentry
= dget(dentry
);
48 while (tdentry
!= exp
->ex_dentry
&& ! IS_ROOT(tdentry
)) {
49 /* make sure parents give x permission to user */
51 parent
= dget_parent(tdentry
);
52 err
= permission(parent
->d_inode
, MAY_EXEC
, NULL
);
60 if (tdentry
!= exp
->ex_dentry
)
61 dprintk("nfsd_acceptable failed at %p %s\n", tdentry
, tdentry
->d_name
.name
);
62 rv
= (tdentry
== exp
->ex_dentry
);
67 /* Type check. The correct error return for type mismatches does not seem to be
68 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
69 * comment in the NFSv3 spec says this is incorrect (implementation notes for
73 nfsd_mode_check(struct svc_rqst
*rqstp
, umode_t mode
, int type
)
75 /* Type can be negative when creating hardlinks - not to a dir */
76 if (type
> 0 && (mode
& S_IFMT
) != type
) {
77 if (rqstp
->rq_vers
== 4 && (mode
& S_IFMT
) == S_IFLNK
)
78 return nfserr_symlink
;
79 else if (type
== S_IFDIR
)
81 else if ((mode
& S_IFMT
) == S_IFDIR
)
86 if (type
< 0 && (mode
& S_IFMT
) == -type
) {
87 if (rqstp
->rq_vers
== 4 && (mode
& S_IFMT
) == S_IFLNK
)
88 return nfserr_symlink
;
89 else if (type
== -S_IFDIR
)
98 * Perform sanity checks on the dentry in a client's file handle.
100 * Note that the file handle dentry may need to be freed even after
103 * This is only called at the start of an nfsproc call, so fhp points to
104 * a svc_fh which is all 0 except for the over-the-wire file handle.
107 fh_verify(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
, int access
)
109 struct knfsd_fh
*fh
= &fhp
->fh_handle
;
110 struct svc_export
*exp
= NULL
;
111 struct dentry
*dentry
;
114 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp
));
116 if (!fhp
->fh_dentry
) {
118 __u32 tfh
[3]; /* filehandle fragment for oldstyle filehandles */
120 int data_left
= fh
->fh_size
/4;
122 error
= nfserr_stale
;
123 if (rqstp
->rq_client
== NULL
)
125 if (rqstp
->rq_vers
> 2)
126 error
= nfserr_badhandle
;
127 if (rqstp
->rq_vers
== 4 && fh
->fh_size
== 0)
128 return nfserr_nofilehandle
;
130 if (fh
->fh_version
== 1) {
133 if (--data_left
<0) goto out
;
134 switch (fh
->fh_auth_type
) {
138 len
= key_len(fh
->fh_fsid_type
) / 4;
139 if (len
== 0) goto out
;
140 if (fh
->fh_fsid_type
== FSID_MAJOR_MINOR
) {
141 /* deprecated, convert to type 3 */
142 len
= key_len(FSID_ENCODE_DEV
)/4;
143 fh
->fh_fsid_type
= FSID_ENCODE_DEV
;
144 fh
->fh_fsid
[0] = new_encode_dev(MKDEV(ntohl(fh
->fh_fsid
[0]), ntohl(fh
->fh_fsid
[1])));
145 fh
->fh_fsid
[1] = fh
->fh_fsid
[2];
147 if ((data_left
-= len
)<0) goto out
;
148 exp
= rqst_exp_find(rqstp
, fh
->fh_fsid_type
, datap
);
153 if (fh
->fh_size
!= NFS_FHSIZE
)
155 /* assume old filehandle format */
156 xdev
= old_decode_dev(fh
->ofh_xdev
);
157 xino
= u32_to_ino_t(fh
->ofh_xino
);
158 mk_fsid(FSID_DEV
, tfh
, xdev
, xino
, 0, NULL
);
159 exp
= rqst_exp_find(rqstp
, FSID_DEV
, tfh
);
162 error
= nfserr_stale
;
163 if (PTR_ERR(exp
) == -ENOENT
)
167 error
= nfserrno(PTR_ERR(exp
));
171 /* Check if the request originated from a secure port. */
173 if (!rqstp
->rq_secure
&& EX_SECURE(exp
)) {
174 char buf
[RPC_MAX_ADDRBUFLEN
];
176 "nfsd: request from insecure port %s!\n",
177 svc_print_addr(rqstp
, buf
, sizeof(buf
)));
181 /* Set user creds for this exportpoint */
182 error
= nfserrno(nfsd_setuser(rqstp
, exp
));
187 * Look up the dentry using the NFS file handle.
189 error
= nfserr_stale
;
190 if (rqstp
->rq_vers
> 2)
191 error
= nfserr_badhandle
;
193 if (fh
->fh_version
!= 1) {
194 tfh
[0] = fh
->ofh_ino
;
195 tfh
[1] = fh
->ofh_generation
;
196 tfh
[2] = fh
->ofh_dirino
;
199 if (fh
->ofh_dirino
== 0)
204 fileid_type
= fh
->fh_fileid_type
;
206 if (fileid_type
== 0)
207 dentry
= dget(exp
->ex_dentry
);
209 dentry
= exportfs_decode_fh(exp
->ex_mnt
, datap
,
210 data_left
, fileid_type
,
211 nfsd_acceptable
, exp
);
215 if (IS_ERR(dentry
)) {
216 if (PTR_ERR(dentry
) != -EINVAL
)
217 error
= nfserrno(PTR_ERR(dentry
));
221 if (S_ISDIR(dentry
->d_inode
->i_mode
) &&
222 (dentry
->d_flags
& DCACHE_DISCONNECTED
)) {
223 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
224 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
227 fhp
->fh_dentry
= dentry
;
228 fhp
->fh_export
= exp
;
231 /* just rechecking permissions
232 * (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well)
234 dprintk("nfsd: fh_verify - just checking\n");
235 dentry
= fhp
->fh_dentry
;
236 exp
= fhp
->fh_export
;
237 /* Set user creds for this exportpoint; necessary even
238 * in the "just checking" case because this may be a
239 * filehandle that was created by fh_compose, and that
240 * is about to be used in another nfsv4 compound
242 error
= nfserrno(nfsd_setuser(rqstp
, exp
));
249 error
= nfsd_mode_check(rqstp
, dentry
->d_inode
->i_mode
, type
);
253 /* Finally, check access permissions. */
254 error
= nfsd_permission(exp
, dentry
, access
);
257 dprintk("fh_verify: %s/%s permission failure, "
258 "acc=%x, error=%d\n",
259 dentry
->d_parent
->d_name
.name
,
261 access
, ntohl(error
));
264 if (exp
&& !IS_ERR(exp
))
266 if (error
== nfserr_stale
)
267 nfsdstats
.fh_stale
++;
273 * Compose a file handle for an NFS reply.
275 * Note that when first composed, the dentry may not yet have
276 * an inode. In this case a call to fh_update should be made
277 * before the fh goes out on the wire ...
279 static inline int _fh_update(struct dentry
*dentry
, struct svc_export
*exp
,
280 __u32
*datap
, int *maxsize
)
282 if (dentry
== exp
->ex_dentry
) {
287 return exportfs_encode_fh(dentry
, datap
, maxsize
,
288 !(exp
->ex_flags
& NFSEXP_NOSUBTREECHECK
));
292 * for composing old style file handles
294 static inline void _fh_update_old(struct dentry
*dentry
,
295 struct svc_export
*exp
,
298 fh
->ofh_ino
= ino_t_to_u32(dentry
->d_inode
->i_ino
);
299 fh
->ofh_generation
= dentry
->d_inode
->i_generation
;
300 if (S_ISDIR(dentry
->d_inode
->i_mode
) ||
301 (exp
->ex_flags
& NFSEXP_NOSUBTREECHECK
))
306 fh_compose(struct svc_fh
*fhp
, struct svc_export
*exp
, struct dentry
*dentry
,
307 struct svc_fh
*ref_fh
)
309 /* ref_fh is a reference file handle.
310 * if it is non-null and for the same filesystem, then we should compose
311 * a filehandle which is of the same version, where possible.
312 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
313 * Then create a 32byte filehandle using nfs_fhbase_old
319 struct inode
* inode
= dentry
->d_inode
;
320 struct dentry
*parent
= dentry
->d_parent
;
322 dev_t ex_dev
= exp
->ex_dentry
->d_inode
->i_sb
->s_dev
;
323 int root_export
= (exp
->ex_dentry
== exp
->ex_dentry
->d_sb
->s_root
);
325 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
326 MAJOR(ex_dev
), MINOR(ex_dev
),
327 (long) exp
->ex_dentry
->d_inode
->i_ino
,
328 parent
->d_name
.name
, dentry
->d_name
.name
,
329 (inode
? inode
->i_ino
: 0));
331 /* Choose filehandle version and fsid type based on
332 * the reference filehandle (if it is in the same export)
333 * or the export options.
337 if (ref_fh
&& ref_fh
->fh_export
== exp
) {
338 version
= ref_fh
->fh_handle
.fh_version
;
339 fsid_type
= ref_fh
->fh_handle
.fh_fsid_type
;
347 fsid_type
= FSID_DEV
;
355 /* Need to check that this type works for this
356 * export point. As the fsid -> filesystem mapping
357 * was guided by user-space, there is no guarantee
358 * that the filesystem actually supports that fsid
359 * type. If it doesn't we loop around again without
364 if (!old_valid_dev(ex_dev
))
367 case FSID_MAJOR_MINOR
:
368 case FSID_ENCODE_DEV
:
369 if (!(exp
->ex_dentry
->d_inode
->i_sb
->s_type
->fs_flags
374 if (! (exp
->ex_flags
& NFSEXP_FSID
))
382 case FSID_UUID4_INUM
:
383 case FSID_UUID16_INUM
:
384 if (exp
->ex_uuid
== NULL
)
388 } else if (exp
->ex_uuid
) {
389 if (fhp
->fh_maxsize
>= 64) {
391 fsid_type
= FSID_UUID16
;
393 fsid_type
= FSID_UUID16_INUM
;
396 fsid_type
= FSID_UUID8
;
398 fsid_type
= FSID_UUID4_INUM
;
400 } else if (exp
->ex_flags
& NFSEXP_FSID
)
401 fsid_type
= FSID_NUM
;
402 else if (!old_valid_dev(ex_dev
))
403 /* for newer device numbers, we must use a newer fsid format */
404 fsid_type
= FSID_ENCODE_DEV
;
406 fsid_type
= FSID_DEV
;
411 if (fhp
->fh_locked
|| fhp
->fh_dentry
) {
412 printk(KERN_ERR
"fh_compose: fh %s/%s not initialized!\n",
413 parent
->d_name
.name
, dentry
->d_name
.name
);
415 if (fhp
->fh_maxsize
< NFS_FHSIZE
)
416 printk(KERN_ERR
"fh_compose: called with maxsize %d! %s/%s\n",
418 parent
->d_name
.name
, dentry
->d_name
.name
);
420 fhp
->fh_dentry
= dget(dentry
); /* our internal copy */
421 fhp
->fh_export
= exp
;
424 if (version
== 0xca) {
425 /* old style filehandle please */
426 memset(&fhp
->fh_handle
.fh_base
, 0, NFS_FHSIZE
);
427 fhp
->fh_handle
.fh_size
= NFS_FHSIZE
;
428 fhp
->fh_handle
.ofh_dcookie
= 0xfeebbaca;
429 fhp
->fh_handle
.ofh_dev
= old_encode_dev(ex_dev
);
430 fhp
->fh_handle
.ofh_xdev
= fhp
->fh_handle
.ofh_dev
;
431 fhp
->fh_handle
.ofh_xino
=
432 ino_t_to_u32(exp
->ex_dentry
->d_inode
->i_ino
);
433 fhp
->fh_handle
.ofh_dirino
= ino_t_to_u32(parent_ino(dentry
));
435 _fh_update_old(dentry
, exp
, &fhp
->fh_handle
);
438 fhp
->fh_handle
.fh_version
= 1;
439 fhp
->fh_handle
.fh_auth_type
= 0;
440 datap
= fhp
->fh_handle
.fh_auth
+0;
441 fhp
->fh_handle
.fh_fsid_type
= fsid_type
;
442 mk_fsid(fsid_type
, datap
, ex_dev
,
443 exp
->ex_dentry
->d_inode
->i_ino
,
444 exp
->ex_fsid
, exp
->ex_uuid
);
446 len
= key_len(fsid_type
);
448 fhp
->fh_handle
.fh_size
= 4 + len
;
451 int size
= (fhp
->fh_maxsize
-len
-4)/4;
452 fhp
->fh_handle
.fh_fileid_type
=
453 _fh_update(dentry
, exp
, datap
, &size
);
454 fhp
->fh_handle
.fh_size
+= size
*4;
456 if (fhp
->fh_handle
.fh_fileid_type
== 255)
457 return nfserr_opnotsupp
;
465 * Update file handle information after changing a dentry.
466 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
469 fh_update(struct svc_fh
*fhp
)
471 struct dentry
*dentry
;
477 dentry
= fhp
->fh_dentry
;
478 if (!dentry
->d_inode
)
480 if (fhp
->fh_handle
.fh_version
!= 1) {
481 _fh_update_old(dentry
, fhp
->fh_export
, &fhp
->fh_handle
);
484 if (fhp
->fh_handle
.fh_fileid_type
!= 0)
486 datap
= fhp
->fh_handle
.fh_auth
+
487 fhp
->fh_handle
.fh_size
/4 -1;
488 size
= (fhp
->fh_maxsize
- fhp
->fh_handle
.fh_size
)/4;
489 fhp
->fh_handle
.fh_fileid_type
=
490 _fh_update(dentry
, fhp
->fh_export
, datap
, &size
);
491 fhp
->fh_handle
.fh_size
+= size
*4;
492 if (fhp
->fh_handle
.fh_fileid_type
== 255)
493 return nfserr_opnotsupp
;
499 printk(KERN_ERR
"fh_update: fh not verified!\n");
502 printk(KERN_ERR
"fh_update: %s/%s still negative!\n",
503 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
508 * Release a file handle.
511 fh_put(struct svc_fh
*fhp
)
513 struct dentry
* dentry
= fhp
->fh_dentry
;
514 struct svc_export
* exp
= fhp
->fh_export
;
517 fhp
->fh_dentry
= NULL
;
519 #ifdef CONFIG_NFSD_V3
520 fhp
->fh_pre_saved
= 0;
521 fhp
->fh_post_saved
= 0;
526 cache_put(&exp
->h
, &svc_export_cache
);
527 fhp
->fh_export
= NULL
;
533 * Shorthand for dprintk()'s
535 char * SVCFH_fmt(struct svc_fh
*fhp
)
537 struct knfsd_fh
*fh
= &fhp
->fh_handle
;
540 sprintf(buf
, "%d: %08x %08x %08x %08x %08x %08x",
542 fh
->fh_base
.fh_pad
[0],
543 fh
->fh_base
.fh_pad
[1],
544 fh
->fh_base
.fh_pad
[2],
545 fh
->fh_base
.fh_pad
[3],
546 fh
->fh_base
.fh_pad
[4],
547 fh
->fh_base
.fh_pad
[5]);
551 enum fsid_source
fsid_source(struct svc_fh
*fhp
)
553 if (fhp
->fh_handle
.fh_version
!= 1)
554 return FSIDSOURCE_DEV
;
555 switch(fhp
->fh_handle
.fh_fsid_type
) {
557 case FSID_ENCODE_DEV
:
558 case FSID_MAJOR_MINOR
:
559 return FSIDSOURCE_DEV
;
561 return FSIDSOURCE_FSID
;
563 if (fhp
->fh_export
->ex_flags
& NFSEXP_FSID
)
564 return FSIDSOURCE_FSID
;
566 return FSIDSOURCE_UUID
;
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