1 #define MSNFS /* HACK HACK */
3 * linux/fs/nfsd/export.c
5 * NFS exporting and validation.
7 * We maintain a list of clients, each of which has a list of
8 * exports. To export an fs to a given client, you first have
9 * to create the client entry with NFSCTL_ADDCLIENT, which
10 * creates a client control block and adds it to the hash
11 * table. Then, you call NFSCTL_EXPORT for each fs.
14 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
17 #include <linux/unistd.h>
18 #include <linux/slab.h>
19 #include <linux/sched.h>
20 #include <linux/stat.h>
22 #include <linux/seq_file.h>
23 #include <linux/syscalls.h>
24 #include <linux/rwsem.h>
25 #include <linux/dcache.h>
26 #include <linux/namei.h>
27 #include <linux/mount.h>
28 #include <linux/hash.h>
29 #include <linux/module.h>
31 #include <linux/sunrpc/svc.h>
32 #include <linux/nfsd/nfsd.h>
33 #include <linux/nfsd/nfsfh.h>
34 #include <linux/nfsd/syscall.h>
35 #include <linux/lockd/bind.h>
37 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
38 #define NFSD_PARANOIA 1
40 typedef struct auth_domain svc_client
;
41 typedef struct svc_export svc_export
;
43 static void exp_do_unexport(svc_export
*unexp
);
44 static int exp_verify_string(char *cp
, int max
);
48 * One maps client+vfsmnt+dentry to export options - the export map
49 * The other maps client+filehandle-fragment to export options. - the expkey map
51 * The export options are actually stored in the first map, and the
52 * second map contains a reference to the entry in the first map.
55 #define EXPKEY_HASHBITS 8
56 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
57 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
58 static struct cache_head
*expkey_table
[EXPKEY_HASHMAX
];
60 static inline int svc_expkey_hash(struct svc_expkey
*item
)
62 int hash
= item
->ek_fsidtype
;
63 char * cp
= (char*)item
->ek_fsid
;
64 int len
= key_len(item
->ek_fsidtype
);
66 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
67 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
68 return hash
& EXPKEY_HASHMASK
;
71 void expkey_put(struct cache_head
*item
, struct cache_detail
*cd
)
73 if (cache_put(item
, cd
)) {
74 struct svc_expkey
*key
= container_of(item
, struct svc_expkey
, h
);
75 if (test_bit(CACHE_VALID
, &item
->flags
) &&
76 !test_bit(CACHE_NEGATIVE
, &item
->flags
)) {
80 auth_domain_put(key
->ek_client
);
85 static void expkey_request(struct cache_detail
*cd
,
87 char **bpp
, int *blen
)
89 /* client fsidtype \xfsid */
90 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
93 qword_add(bpp
, blen
, ek
->ek_client
->name
);
94 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
95 qword_add(bpp
, blen
, type
);
96 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
100 static struct svc_expkey
*svc_expkey_lookup(struct svc_expkey
*, int);
101 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
103 /* client fsidtype fsid [path] */
106 struct auth_domain
*dom
= NULL
;
110 struct svc_expkey key
;
112 if (mesg
[mlen
-1] != '\n')
116 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
121 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
125 dom
= auth_domain_find(buf
);
128 dprintk("found domain %s\n", buf
);
131 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
133 fsidtype
= simple_strtoul(buf
, &ep
, 10);
136 dprintk("found fsidtype %d\n", fsidtype
);
139 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
141 dprintk("found fsid length %d\n", len
);
142 if (len
!= key_len(fsidtype
))
145 /* OK, we seem to have a valid key */
147 key
.h
.expiry_time
= get_expiry(&mesg
);
148 if (key
.h
.expiry_time
== 0)
152 key
.ek_fsidtype
= fsidtype
;
153 memcpy(key
.ek_fsid
, buf
, len
);
155 /* now we want a pathname, or empty meaning NEGATIVE */
156 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) < 0)
158 dprintk("Path seems to be <%s>\n", buf
);
161 struct svc_expkey
*ek
;
162 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
163 ek
= svc_expkey_lookup(&key
, 1);
165 expkey_put(&ek
->h
, &svc_expkey_cache
);
168 struct svc_expkey
*ek
;
169 err
= path_lookup(buf
, 0, &nd
);
173 dprintk("Found the path %s\n", buf
);
175 key
.ek_dentry
= nd
.dentry
;
177 ek
= svc_expkey_lookup(&key
, 1);
179 expkey_put(&ek
->h
, &svc_expkey_cache
);
186 auth_domain_put(dom
);
191 static int expkey_show(struct seq_file
*m
,
192 struct cache_detail
*cd
,
193 struct cache_head
*h
)
195 struct svc_expkey
*ek
;
198 seq_puts(m
, "#domain fsidtype fsid [path]\n");
201 ek
= container_of(h
, struct svc_expkey
, h
);
202 seq_printf(m
, "%s %d 0x%08x", ek
->ek_client
->name
,
203 ek
->ek_fsidtype
, ek
->ek_fsid
[0]);
204 if (ek
->ek_fsidtype
!= 1)
205 seq_printf(m
, "%08x", ek
->ek_fsid
[1]);
206 if (ek
->ek_fsidtype
== 2)
207 seq_printf(m
, "%08x", ek
->ek_fsid
[2]);
208 if (test_bit(CACHE_VALID
, &h
->flags
) &&
209 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
211 seq_path(m
, ek
->ek_mnt
, ek
->ek_dentry
, "\\ \t\n");
217 struct cache_detail svc_expkey_cache
= {
218 .owner
= THIS_MODULE
,
219 .hash_size
= EXPKEY_HASHMAX
,
220 .hash_table
= expkey_table
,
222 .cache_put
= expkey_put
,
223 .cache_request
= expkey_request
,
224 .cache_parse
= expkey_parse
,
225 .cache_show
= expkey_show
,
228 static inline int svc_expkey_match (struct svc_expkey
*a
, struct svc_expkey
*b
)
230 if (a
->ek_fsidtype
!= b
->ek_fsidtype
||
231 a
->ek_client
!= b
->ek_client
||
232 memcmp(a
->ek_fsid
, b
->ek_fsid
, key_len(a
->ek_fsidtype
)) != 0)
237 static inline void svc_expkey_init(struct svc_expkey
*new, struct svc_expkey
*item
)
239 kref_get(&item
->ek_client
->ref
);
240 new->ek_client
= item
->ek_client
;
241 new->ek_fsidtype
= item
->ek_fsidtype
;
242 new->ek_fsid
[0] = item
->ek_fsid
[0];
243 new->ek_fsid
[1] = item
->ek_fsid
[1];
244 new->ek_fsid
[2] = item
->ek_fsid
[2];
247 static inline void svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*item
)
249 new->ek_mnt
= mntget(item
->ek_mnt
);
250 new->ek_dentry
= dget(item
->ek_dentry
);
253 static DefineSimpleCacheLookup(svc_expkey
,0) /* no inplace updates */
255 #define EXPORT_HASHBITS 8
256 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
257 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
259 static struct cache_head
*export_table
[EXPORT_HASHMAX
];
261 static inline int svc_export_hash(struct svc_export
*item
)
265 rv
= hash_ptr(item
->ex_client
, EXPORT_HASHBITS
);
266 rv
^= hash_ptr(item
->ex_dentry
, EXPORT_HASHBITS
);
267 rv
^= hash_ptr(item
->ex_mnt
, EXPORT_HASHBITS
);
271 void svc_export_put(struct cache_head
*item
, struct cache_detail
*cd
)
273 if (cache_put(item
, cd
)) {
274 struct svc_export
*exp
= container_of(item
, struct svc_export
, h
);
275 dput(exp
->ex_dentry
);
277 auth_domain_put(exp
->ex_client
);
282 static void svc_export_request(struct cache_detail
*cd
,
283 struct cache_head
*h
,
284 char **bpp
, int *blen
)
287 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
290 qword_add(bpp
, blen
, exp
->ex_client
->name
);
291 pth
= d_path(exp
->ex_dentry
, exp
->ex_mnt
, *bpp
, *blen
);
293 /* is this correct? */
297 qword_add(bpp
, blen
, pth
);
301 static struct svc_export
*svc_export_lookup(struct svc_export
*, int);
303 static int check_export(struct inode
*inode
, int flags
)
306 /* We currently export only dirs and regular files.
307 * This is what umountd does.
309 if (!S_ISDIR(inode
->i_mode
) &&
310 !S_ISREG(inode
->i_mode
))
313 /* There are two requirements on a filesystem to be exportable.
314 * 1: We must be able to identify the filesystem from a number.
315 * either a device number (so FS_REQUIRES_DEV needed)
316 * or an FSID number (so NFSEXP_FSID needed).
317 * 2: We must be able to find an inode from a filehandle.
318 * This means that s_export_op must be set.
320 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
321 !(flags
& NFSEXP_FSID
)) {
322 dprintk("exp_export: export of non-dev fs without fsid");
325 if (!inode
->i_sb
->s_export_op
) {
326 dprintk("exp_export: export of invalid fs type.\n");
330 /* Ok, we can export it */;
331 if (!inode
->i_sb
->s_export_op
->find_exported_dentry
)
332 inode
->i_sb
->s_export_op
->find_exported_dentry
=
333 find_exported_dentry
;
338 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
340 /* client path expiry [flags anonuid anongid fsid] */
344 struct auth_domain
*dom
= NULL
;
346 struct svc_export exp
, *expp
;
351 if (mesg
[mlen
-1] != '\n')
355 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
360 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
362 if (len
<= 0) goto out
;
365 dom
= auth_domain_find(buf
);
371 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
373 err
= path_lookup(buf
, 0, &nd
);
379 exp
.ex_dentry
= nd
.dentry
;
383 exp
.h
.expiry_time
= get_expiry(&mesg
);
384 if (exp
.h
.expiry_time
== 0)
388 err
= get_int(&mesg
, &an_int
);
390 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
392 if (err
|| an_int
< 0) goto out
;
393 exp
.ex_flags
= an_int
;
396 err
= get_int(&mesg
, &an_int
);
398 exp
.ex_anon_uid
= an_int
;
401 err
= get_int(&mesg
, &an_int
);
403 exp
.ex_anon_gid
= an_int
;
406 err
= get_int(&mesg
, &an_int
);
408 exp
.ex_fsid
= an_int
;
410 err
= check_export(nd
.dentry
->d_inode
, exp
.ex_flags
);
414 expp
= svc_export_lookup(&exp
, 1);
423 auth_domain_put(dom
);
428 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
, uid_t anonu
, uid_t anong
);
430 static int svc_export_show(struct seq_file
*m
,
431 struct cache_detail
*cd
,
432 struct cache_head
*h
)
434 struct svc_export
*exp
;
437 seq_puts(m
, "#path domain(flags)\n");
440 exp
= container_of(h
, struct svc_export
, h
);
441 seq_path(m
, exp
->ex_mnt
, exp
->ex_dentry
, " \t\n\\");
443 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
445 if (test_bit(CACHE_VALID
, &h
->flags
) &&
446 !test_bit(CACHE_NEGATIVE
, &h
->flags
))
447 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
448 exp
->ex_anon_uid
, exp
->ex_anon_gid
);
452 struct cache_detail svc_export_cache
= {
453 .owner
= THIS_MODULE
,
454 .hash_size
= EXPORT_HASHMAX
,
455 .hash_table
= export_table
,
456 .name
= "nfsd.export",
457 .cache_put
= svc_export_put
,
458 .cache_request
= svc_export_request
,
459 .cache_parse
= svc_export_parse
,
460 .cache_show
= svc_export_show
,
463 static inline int svc_export_match(struct svc_export
*a
, struct svc_export
*b
)
465 return a
->ex_client
== b
->ex_client
&&
466 a
->ex_dentry
== b
->ex_dentry
&&
467 a
->ex_mnt
== b
->ex_mnt
;
469 static inline void svc_export_init(struct svc_export
*new, struct svc_export
*item
)
471 kref_get(&item
->ex_client
->ref
);
472 new->ex_client
= item
->ex_client
;
473 new->ex_dentry
= dget(item
->ex_dentry
);
474 new->ex_mnt
= mntget(item
->ex_mnt
);
477 static inline void svc_export_update(struct svc_export
*new, struct svc_export
*item
)
479 new->ex_flags
= item
->ex_flags
;
480 new->ex_anon_uid
= item
->ex_anon_uid
;
481 new->ex_anon_gid
= item
->ex_anon_gid
;
482 new->ex_fsid
= item
->ex_fsid
;
485 static DefineSimpleCacheLookup(svc_export
,1) /* allow inplace updates */
489 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
491 struct svc_expkey key
, *ek
;
498 key
.ek_fsidtype
= fsid_type
;
499 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
501 ek
= svc_expkey_lookup(&key
, 0);
503 if ((err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
)))
508 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
509 struct svc_export
*exp
)
511 struct svc_expkey key
, *ek
;
514 key
.ek_fsidtype
= fsid_type
;
515 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
516 key
.ek_mnt
= exp
->ex_mnt
;
517 key
.ek_dentry
= exp
->ex_dentry
;
518 key
.h
.expiry_time
= NEVER
;
521 ek
= svc_expkey_lookup(&key
, 1);
523 expkey_put(&ek
->h
, &svc_expkey_cache
);
530 * Find the client's export entry matching xdev/xino.
532 static inline struct svc_expkey
*
533 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
537 if (old_valid_dev(dev
)) {
538 mk_fsid_v0(fsidv
, dev
, ino
);
539 return exp_find_key(clp
, 0, fsidv
, NULL
);
541 mk_fsid_v3(fsidv
, dev
, ino
);
542 return exp_find_key(clp
, 3, fsidv
, NULL
);
546 * Find the client's export entry matching fsid
548 static inline struct svc_expkey
*
549 exp_get_fsid_key(svc_client
*clp
, int fsid
)
553 mk_fsid_v1(fsidv
, fsid
);
555 return exp_find_key(clp
, 1, fsidv
, NULL
);
559 exp_get_by_name(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
560 struct cache_req
*reqp
)
562 struct svc_export
*exp
, key
;
569 key
.ex_dentry
= dentry
;
571 exp
= svc_export_lookup(&key
, 0);
573 switch (cache_check(&svc_export_cache
, &exp
->h
, reqp
)) {
576 exp
= ERR_PTR(-EAGAIN
);
586 * Find the export entry for a given dentry.
589 exp_parent(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
590 struct cache_req
*reqp
)
595 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
597 while (exp
== NULL
&& !IS_ROOT(dentry
)) {
598 struct dentry
*parent
;
600 parent
= dget_parent(dentry
);
603 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
610 * Hashtable locking. Write locks are placed only by user processes
611 * wanting to modify export information.
612 * Write locking only done in this file. Read locking
616 static DECLARE_RWSEM(hash_sem
);
621 down_read(&hash_sem
);
627 down_write(&hash_sem
);
637 exp_writeunlock(void)
642 static void exp_fsid_unhash(struct svc_export
*exp
)
644 struct svc_expkey
*ek
;
646 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
649 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
650 if (ek
&& !IS_ERR(ek
)) {
651 ek
->h
.expiry_time
= get_seconds()-1;
652 expkey_put(&ek
->h
, &svc_expkey_cache
);
654 svc_expkey_cache
.nextcheck
= get_seconds();
657 static int exp_fsid_hash(svc_client
*clp
, struct svc_export
*exp
)
661 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
664 mk_fsid_v1(fsid
, exp
->ex_fsid
);
665 return exp_set_key(clp
, 1, fsid
, exp
);
668 static int exp_hash(struct auth_domain
*clp
, struct svc_export
*exp
)
671 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
672 dev_t dev
= inode
->i_sb
->s_dev
;
674 if (old_valid_dev(dev
)) {
675 mk_fsid_v0(fsid
, dev
, inode
->i_ino
);
676 return exp_set_key(clp
, 0, fsid
, exp
);
678 mk_fsid_v3(fsid
, dev
, inode
->i_ino
);
679 return exp_set_key(clp
, 3, fsid
, exp
);
682 static void exp_unhash(struct svc_export
*exp
)
684 struct svc_expkey
*ek
;
685 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
687 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
688 if (ek
&& !IS_ERR(ek
)) {
689 ek
->h
.expiry_time
= get_seconds()-1;
690 expkey_put(&ek
->h
, &svc_expkey_cache
);
692 svc_expkey_cache
.nextcheck
= get_seconds();
696 * Export a file system.
699 exp_export(struct nfsctl_export
*nxp
)
702 struct svc_export
*exp
= NULL
;
703 struct svc_export
new;
704 struct svc_expkey
*fsid_key
= NULL
;
708 /* Consistency check */
710 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
711 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
714 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
715 nxp
->ex_client
, nxp
->ex_path
,
716 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
719 /* Try to lock the export table for update */
722 /* Look up client info */
723 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
727 /* Look up the dentry */
728 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
733 exp
= exp_get_by_name(clp
, nd
.mnt
, nd
.dentry
, NULL
);
735 /* must make sure there won't be an ex_fsid clash */
736 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
737 (fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
)) &&
740 (fsid_key
->ek_mnt
!= nd
.mnt
|| fsid_key
->ek_dentry
!= nd
.dentry
) )
744 /* just a flags/id/fsid update */
746 exp_fsid_unhash(exp
);
747 exp
->ex_flags
= nxp
->ex_flags
;
748 exp
->ex_anon_uid
= nxp
->ex_anon_uid
;
749 exp
->ex_anon_gid
= nxp
->ex_anon_gid
;
750 exp
->ex_fsid
= nxp
->ex_dev
;
752 err
= exp_fsid_hash(clp
, exp
);
756 err
= check_export(nd
.dentry
->d_inode
, nxp
->ex_flags
);
757 if (err
) goto finish
;
761 dprintk("nfsd: creating export entry %p for client %p\n", exp
, clp
);
763 new.h
.expiry_time
= NEVER
;
767 new.ex_dentry
= nd
.dentry
;
768 new.ex_flags
= nxp
->ex_flags
;
769 new.ex_anon_uid
= nxp
->ex_anon_uid
;
770 new.ex_anon_gid
= nxp
->ex_anon_gid
;
771 new.ex_fsid
= nxp
->ex_dev
;
773 exp
= svc_export_lookup(&new, 1);
780 if (exp_hash(clp
, exp
) ||
781 exp_fsid_hash(clp
, exp
)) {
782 /* failed to create at least one index */
783 exp_do_unexport(exp
);
791 if (fsid_key
&& !IS_ERR(fsid_key
))
792 expkey_put(&fsid_key
->h
, &svc_expkey_cache
);
794 auth_domain_put(clp
);
803 * Unexport a file system. The export entry has already
804 * been removed from the client's list of exported fs's.
807 exp_do_unexport(svc_export
*unexp
)
809 unexp
->h
.expiry_time
= get_seconds()-1;
810 svc_export_cache
.nextcheck
= get_seconds();
812 exp_fsid_unhash(unexp
);
820 exp_unexport(struct nfsctl_export
*nxp
)
822 struct auth_domain
*dom
;
827 /* Consistency check */
828 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
829 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
835 dom
= auth_domain_find(nxp
->ex_client
);
837 dprintk("nfsd: unexport couldn't find %s\n", nxp
->ex_client
);
841 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
846 exp
= exp_get_by_name(dom
, nd
.mnt
, nd
.dentry
, NULL
);
851 exp_do_unexport(exp
);
856 auth_domain_put(dom
);
864 * Obtain the root fh on behalf of a client.
865 * This could be done in user space, but I feel that it adds some safety
866 * since its harder to fool a kernel module than a user space program.
869 exp_rootfh(svc_client
*clp
, char *path
, struct knfsd_fh
*f
, int maxsize
)
871 struct svc_export
*exp
;
878 /* NB: we probably ought to check that it's NUL-terminated */
879 if (path_lookup(path
, 0, &nd
)) {
880 printk("nfsd: exp_rootfh path not found %s", path
);
883 inode
= nd
.dentry
->d_inode
;
885 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
886 path
, nd
.dentry
, clp
->name
,
887 inode
->i_sb
->s_id
, inode
->i_ino
);
888 exp
= exp_parent(clp
, nd
.mnt
, nd
.dentry
, NULL
);
890 dprintk("nfsd: exp_rootfh export not found.\n");
895 * fh must be initialized before calling fh_compose
897 fh_init(&fh
, maxsize
);
898 if (fh_compose(&fh
, exp
, nd
.dentry
, NULL
))
902 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
911 exp_find(struct auth_domain
*clp
, int fsid_type
, u32
*fsidv
,
912 struct cache_req
*reqp
)
914 struct svc_export
*exp
;
915 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
916 if (!ek
|| IS_ERR(ek
))
917 return ERR_PTR(PTR_ERR(ek
));
919 exp
= exp_get_by_name(clp
, ek
->ek_mnt
, ek
->ek_dentry
, reqp
);
920 expkey_put(&ek
->h
, &svc_expkey_cache
);
922 if (!exp
|| IS_ERR(exp
))
923 return ERR_PTR(PTR_ERR(exp
));
929 * Called when we need the filehandle for the root of the pseudofs,
930 * for a given NFSv4 client. The root is defined to be the
931 * export point with fsid==0
934 exp_pseudoroot(struct auth_domain
*clp
, struct svc_fh
*fhp
,
935 struct cache_req
*creq
)
937 struct svc_expkey
*fsid_key
;
938 struct svc_export
*exp
;
942 mk_fsid_v1(fsidv
, 0);
944 fsid_key
= exp_find_key(clp
, 1, fsidv
, creq
);
945 if (IS_ERR(fsid_key
) && PTR_ERR(fsid_key
) == -EAGAIN
)
946 return nfserr_dropit
;
947 if (!fsid_key
|| IS_ERR(fsid_key
))
950 exp
= exp_get_by_name(clp
, fsid_key
->ek_mnt
, fsid_key
->ek_dentry
, creq
);
953 else if (IS_ERR(exp
))
954 rv
= nfserrno(PTR_ERR(exp
));
956 rv
= fh_compose(fhp
, exp
,
957 fsid_key
->ek_dentry
, NULL
);
958 expkey_put(&fsid_key
->h
, &svc_expkey_cache
);
964 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
967 unsigned hash
, export
;
968 struct cache_head
*ch
;
971 read_lock(&svc_export_cache
.hash_lock
);
975 export
= n
& ((1LL<<32) - 1);
978 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
981 n
&= ~((1LL<<32) - 1);
985 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
986 if (hash
>= EXPORT_HASHMAX
)
989 return export_table
[hash
];
992 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
994 struct cache_head
*ch
= p
;
995 int hash
= (*pos
>> 32);
999 else if (ch
->next
== NULL
) {
1006 *pos
&= ~((1LL<<32) - 1);
1007 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1011 if (hash
>= EXPORT_HASHMAX
)
1014 return export_table
[hash
];
1017 static void e_stop(struct seq_file
*m
, void *p
)
1019 read_unlock(&svc_export_cache
.hash_lock
);
1023 static struct flags
{
1027 { NFSEXP_READONLY
, {"ro", "rw"}},
1028 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1029 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1030 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1031 { NFSEXP_ASYNC
, {"async", "sync"}},
1032 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1033 { NFSEXP_NOHIDE
, {"nohide", ""}},
1034 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1035 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1036 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1038 { NFSEXP_MSNFS
, {"msnfs", ""}},
1043 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
, uid_t anonu
, uid_t anong
)
1048 for (flg
= expflags
; flg
->flag
; flg
++) {
1049 int state
= (flg
->flag
& flag
)?0:1;
1050 if (*flg
->name
[state
])
1051 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1053 if (flag
& NFSEXP_FSID
)
1054 seq_printf(m
, "%sfsid=%d", first
++?",":"", fsid
);
1055 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1056 seq_printf(m
, "%sanonuid=%d", first
++?",":"", anonu
);
1057 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1058 seq_printf(m
, "%sanongid=%d", first
++?",":"", anong
);
1061 static int e_show(struct seq_file
*m
, void *p
)
1063 struct cache_head
*cp
= p
;
1064 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1067 if (p
== (void *)1) {
1068 seq_puts(m
, "# Version 1.1\n");
1069 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1073 clp
= exp
->ex_client
;
1075 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1077 if (cache_put(&exp
->h
, &svc_export_cache
)) BUG();
1078 return svc_export_show(m
, &svc_export_cache
, cp
);
1081 struct seq_operations nfs_exports_op
= {
1089 * Add or modify a client.
1090 * Change requests may involve the list of host addresses. The list of
1091 * exports and possibly existing uid maps are left untouched.
1094 exp_addclient(struct nfsctl_client
*ncp
)
1096 struct auth_domain
*dom
;
1099 /* First, consistency check. */
1101 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1103 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1106 /* Lock the hashtable */
1109 dom
= unix_domain_find(ncp
->cl_ident
);
1115 /* Insert client into hashtable. */
1116 for (i
= 0; i
< ncp
->cl_naddr
; i
++)
1117 auth_unix_add_addr(ncp
->cl_addrlist
[i
], dom
);
1119 auth_unix_forget_old(dom
);
1120 auth_domain_put(dom
);
1131 * Delete a client given an identifier.
1134 exp_delclient(struct nfsctl_client
*ncp
)
1137 struct auth_domain
*dom
;
1140 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1143 /* Lock the hashtable */
1146 dom
= auth_domain_find(ncp
->cl_ident
);
1147 /* just make sure that no addresses work
1148 * and that it will expire soon
1151 err
= auth_unix_forget_old(dom
);
1152 auth_domain_put(dom
);
1161 * Verify that string is non-empty and does not exceed max length.
1164 exp_verify_string(char *cp
, int max
)
1168 for (i
= 0; i
< max
; i
++)
1172 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1177 * Initialize the exports module.
1180 nfsd_export_init(void)
1182 dprintk("nfsd: initializing export module.\n");
1184 cache_register(&svc_export_cache
);
1185 cache_register(&svc_expkey_cache
);
1190 * Flush exports table - called when last nfsd thread is killed
1193 nfsd_export_flush(void)
1196 cache_purge(&svc_expkey_cache
);
1197 cache_purge(&svc_export_cache
);
1202 * Shutdown the exports module.
1205 nfsd_export_shutdown(void)
1208 dprintk("nfsd: shutting down export module.\n");
1212 if (cache_unregister(&svc_expkey_cache
))
1213 printk(KERN_ERR
"nfsd: failed to unregister expkey cache\n");
1214 if (cache_unregister(&svc_export_cache
))
1215 printk(KERN_ERR
"nfsd: failed to unregister export cache\n");
1216 svcauth_unix_purge();
1219 dprintk("nfsd: export shutdown complete.\n");