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 void expkey_put(struct kref
*ref
)
62 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
64 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
65 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
)) {
69 auth_domain_put(key
->ek_client
);
73 static void expkey_request(struct cache_detail
*cd
,
75 char **bpp
, int *blen
)
77 /* client fsidtype \xfsid */
78 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
81 qword_add(bpp
, blen
, ek
->ek_client
->name
);
82 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
83 qword_add(bpp
, blen
, type
);
84 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
88 static struct svc_expkey
*svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
);
89 static struct svc_expkey
*svc_expkey_lookup(struct svc_expkey
*);
90 static struct cache_detail svc_expkey_cache
;
92 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
94 /* client fsidtype fsid [path] */
97 struct auth_domain
*dom
= NULL
;
101 struct svc_expkey key
;
102 struct svc_expkey
*ek
;
104 if (mesg
[mlen
-1] != '\n')
108 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
113 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
117 dom
= auth_domain_find(buf
);
120 dprintk("found domain %s\n", buf
);
123 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
125 fsidtype
= simple_strtoul(buf
, &ep
, 10);
128 dprintk("found fsidtype %d\n", fsidtype
);
131 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
133 dprintk("found fsid length %d\n", len
);
134 if (len
!= key_len(fsidtype
))
137 /* OK, we seem to have a valid key */
139 key
.h
.expiry_time
= get_expiry(&mesg
);
140 if (key
.h
.expiry_time
== 0)
144 key
.ek_fsidtype
= fsidtype
;
145 memcpy(key
.ek_fsid
, buf
, len
);
147 ek
= svc_expkey_lookup(&key
);
152 /* now we want a pathname, or empty meaning NEGATIVE */
154 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) < 0)
156 dprintk("Path seems to be <%s>\n", buf
);
159 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
160 ek
= svc_expkey_update(&key
, ek
);
162 cache_put(&ek
->h
, &svc_expkey_cache
);
166 err
= path_lookup(buf
, 0, &nd
);
170 dprintk("Found the path %s\n", buf
);
172 key
.ek_dentry
= nd
.dentry
;
174 ek
= svc_expkey_update(&key
, ek
);
176 cache_put(&ek
->h
, &svc_expkey_cache
);
184 auth_domain_put(dom
);
189 static int expkey_show(struct seq_file
*m
,
190 struct cache_detail
*cd
,
191 struct cache_head
*h
)
193 struct svc_expkey
*ek
;
196 seq_puts(m
, "#domain fsidtype fsid [path]\n");
199 ek
= container_of(h
, struct svc_expkey
, h
);
200 seq_printf(m
, "%s %d 0x%08x", ek
->ek_client
->name
,
201 ek
->ek_fsidtype
, ek
->ek_fsid
[0]);
202 if (ek
->ek_fsidtype
!= 1)
203 seq_printf(m
, "%08x", ek
->ek_fsid
[1]);
204 if (ek
->ek_fsidtype
== 2)
205 seq_printf(m
, "%08x", ek
->ek_fsid
[2]);
206 if (test_bit(CACHE_VALID
, &h
->flags
) &&
207 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
209 seq_path(m
, ek
->ek_mnt
, ek
->ek_dentry
, "\\ \t\n");
215 static inline int expkey_match (struct cache_head
*a
, struct cache_head
*b
)
217 struct svc_expkey
*orig
= container_of(a
, struct svc_expkey
, h
);
218 struct svc_expkey
*new = container_of(b
, struct svc_expkey
, h
);
220 if (orig
->ek_fsidtype
!= new->ek_fsidtype
||
221 orig
->ek_client
!= new->ek_client
||
222 memcmp(orig
->ek_fsid
, new->ek_fsid
, key_len(orig
->ek_fsidtype
)) != 0)
227 static inline void expkey_init(struct cache_head
*cnew
,
228 struct cache_head
*citem
)
230 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
231 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
233 kref_get(&item
->ek_client
->ref
);
234 new->ek_client
= item
->ek_client
;
235 new->ek_fsidtype
= item
->ek_fsidtype
;
236 new->ek_fsid
[0] = item
->ek_fsid
[0];
237 new->ek_fsid
[1] = item
->ek_fsid
[1];
238 new->ek_fsid
[2] = item
->ek_fsid
[2];
241 static inline void expkey_update(struct cache_head
*cnew
,
242 struct cache_head
*citem
)
244 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
245 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
247 new->ek_mnt
= mntget(item
->ek_mnt
);
248 new->ek_dentry
= dget(item
->ek_dentry
);
251 static struct cache_head
*expkey_alloc(void)
253 struct svc_expkey
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
260 static struct cache_detail svc_expkey_cache
= {
261 .owner
= THIS_MODULE
,
262 .hash_size
= EXPKEY_HASHMAX
,
263 .hash_table
= expkey_table
,
265 .cache_put
= expkey_put
,
266 .cache_request
= expkey_request
,
267 .cache_parse
= expkey_parse
,
268 .cache_show
= expkey_show
,
269 .match
= expkey_match
,
271 .update
= expkey_update
,
272 .alloc
= expkey_alloc
,
275 static struct svc_expkey
*
276 svc_expkey_lookup(struct svc_expkey
*item
)
278 struct cache_head
*ch
;
279 int hash
= item
->ek_fsidtype
;
280 char * cp
= (char*)item
->ek_fsid
;
281 int len
= key_len(item
->ek_fsidtype
);
283 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
284 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
285 hash
&= EXPKEY_HASHMASK
;
287 ch
= sunrpc_cache_lookup(&svc_expkey_cache
, &item
->h
,
290 return container_of(ch
, struct svc_expkey
, h
);
295 static struct svc_expkey
*
296 svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
)
298 struct cache_head
*ch
;
299 int hash
= new->ek_fsidtype
;
300 char * cp
= (char*)new->ek_fsid
;
301 int len
= key_len(new->ek_fsidtype
);
303 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
304 hash
^= hash_ptr(new->ek_client
, EXPKEY_HASHBITS
);
305 hash
&= EXPKEY_HASHMASK
;
307 ch
= sunrpc_cache_update(&svc_expkey_cache
, &new->h
,
310 return container_of(ch
, struct svc_expkey
, h
);
316 #define EXPORT_HASHBITS 8
317 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
318 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
320 static struct cache_head
*export_table
[EXPORT_HASHMAX
];
322 static void svc_export_put(struct kref
*ref
)
324 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
325 dput(exp
->ex_dentry
);
327 auth_domain_put(exp
->ex_client
);
331 static void svc_export_request(struct cache_detail
*cd
,
332 struct cache_head
*h
,
333 char **bpp
, int *blen
)
336 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
339 qword_add(bpp
, blen
, exp
->ex_client
->name
);
340 pth
= d_path(exp
->ex_dentry
, exp
->ex_mnt
, *bpp
, *blen
);
342 /* is this correct? */
346 qword_add(bpp
, blen
, pth
);
350 static struct svc_export
*svc_export_update(struct svc_export
*new,
351 struct svc_export
*old
);
352 static struct svc_export
*svc_export_lookup(struct svc_export
*);
354 static int check_export(struct inode
*inode
, int flags
)
357 /* We currently export only dirs and regular files.
358 * This is what umountd does.
360 if (!S_ISDIR(inode
->i_mode
) &&
361 !S_ISREG(inode
->i_mode
))
364 /* There are two requirements on a filesystem to be exportable.
365 * 1: We must be able to identify the filesystem from a number.
366 * either a device number (so FS_REQUIRES_DEV needed)
367 * or an FSID number (so NFSEXP_FSID needed).
368 * 2: We must be able to find an inode from a filehandle.
369 * This means that s_export_op must be set.
371 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
372 !(flags
& NFSEXP_FSID
)) {
373 dprintk("exp_export: export of non-dev fs without fsid");
376 if (!inode
->i_sb
->s_export_op
) {
377 dprintk("exp_export: export of invalid fs type.\n");
381 /* Ok, we can export it */;
382 if (!inode
->i_sb
->s_export_op
->find_exported_dentry
)
383 inode
->i_sb
->s_export_op
->find_exported_dentry
=
384 find_exported_dentry
;
389 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
391 /* client path expiry [flags anonuid anongid fsid] */
395 struct auth_domain
*dom
= NULL
;
397 struct svc_export exp
, *expp
;
402 if (mesg
[mlen
-1] != '\n')
406 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
411 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
413 if (len
<= 0) goto out
;
416 dom
= auth_domain_find(buf
);
422 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
424 err
= path_lookup(buf
, 0, &nd
);
430 exp
.ex_dentry
= nd
.dentry
;
434 exp
.h
.expiry_time
= get_expiry(&mesg
);
435 if (exp
.h
.expiry_time
== 0)
439 err
= get_int(&mesg
, &an_int
);
441 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
443 if (err
|| an_int
< 0) goto out
;
444 exp
.ex_flags
= an_int
;
447 err
= get_int(&mesg
, &an_int
);
449 exp
.ex_anon_uid
= an_int
;
452 err
= get_int(&mesg
, &an_int
);
454 exp
.ex_anon_gid
= an_int
;
457 err
= get_int(&mesg
, &an_int
);
459 exp
.ex_fsid
= an_int
;
461 err
= check_export(nd
.dentry
->d_inode
, exp
.ex_flags
);
465 expp
= svc_export_lookup(&exp
);
467 expp
= svc_export_update(&exp
, expp
);
479 auth_domain_put(dom
);
484 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
, uid_t anonu
, uid_t anong
);
486 static int svc_export_show(struct seq_file
*m
,
487 struct cache_detail
*cd
,
488 struct cache_head
*h
)
490 struct svc_export
*exp
;
493 seq_puts(m
, "#path domain(flags)\n");
496 exp
= container_of(h
, struct svc_export
, h
);
497 seq_path(m
, exp
->ex_mnt
, exp
->ex_dentry
, " \t\n\\");
499 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
501 if (test_bit(CACHE_VALID
, &h
->flags
) &&
502 !test_bit(CACHE_NEGATIVE
, &h
->flags
))
503 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
504 exp
->ex_anon_uid
, exp
->ex_anon_gid
);
508 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
510 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
511 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
512 return orig
->ex_client
== new->ex_client
&&
513 orig
->ex_dentry
== new->ex_dentry
&&
514 orig
->ex_mnt
== new->ex_mnt
;
517 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
519 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
520 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
522 kref_get(&item
->ex_client
->ref
);
523 new->ex_client
= item
->ex_client
;
524 new->ex_dentry
= dget(item
->ex_dentry
);
525 new->ex_mnt
= mntget(item
->ex_mnt
);
528 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
530 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
531 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
533 new->ex_flags
= item
->ex_flags
;
534 new->ex_anon_uid
= item
->ex_anon_uid
;
535 new->ex_anon_gid
= item
->ex_anon_gid
;
536 new->ex_fsid
= item
->ex_fsid
;
539 static struct cache_head
*svc_export_alloc(void)
541 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
548 struct cache_detail svc_export_cache
= {
549 .owner
= THIS_MODULE
,
550 .hash_size
= EXPORT_HASHMAX
,
551 .hash_table
= export_table
,
552 .name
= "nfsd.export",
553 .cache_put
= svc_export_put
,
554 .cache_request
= svc_export_request
,
555 .cache_parse
= svc_export_parse
,
556 .cache_show
= svc_export_show
,
557 .match
= svc_export_match
,
558 .init
= svc_export_init
,
559 .update
= export_update
,
560 .alloc
= svc_export_alloc
,
563 static struct svc_export
*
564 svc_export_lookup(struct svc_export
*exp
)
566 struct cache_head
*ch
;
568 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
569 hash
^= hash_ptr(exp
->ex_dentry
, EXPORT_HASHBITS
);
570 hash
^= hash_ptr(exp
->ex_mnt
, EXPORT_HASHBITS
);
572 ch
= sunrpc_cache_lookup(&svc_export_cache
, &exp
->h
,
575 return container_of(ch
, struct svc_export
, h
);
580 static struct svc_export
*
581 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
583 struct cache_head
*ch
;
585 hash
= hash_ptr(old
->ex_client
, EXPORT_HASHBITS
);
586 hash
^= hash_ptr(old
->ex_dentry
, EXPORT_HASHBITS
);
587 hash
^= hash_ptr(old
->ex_mnt
, EXPORT_HASHBITS
);
589 ch
= sunrpc_cache_update(&svc_export_cache
, &new->h
,
593 return container_of(ch
, struct svc_export
, h
);
599 static struct svc_expkey
*
600 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
602 struct svc_expkey key
, *ek
;
609 key
.ek_fsidtype
= fsid_type
;
610 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
612 ek
= svc_expkey_lookup(&key
);
614 if ((err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
)))
619 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
620 struct svc_export
*exp
)
622 struct svc_expkey key
, *ek
;
625 key
.ek_fsidtype
= fsid_type
;
626 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
627 key
.ek_mnt
= exp
->ex_mnt
;
628 key
.ek_dentry
= exp
->ex_dentry
;
629 key
.h
.expiry_time
= NEVER
;
632 ek
= svc_expkey_lookup(&key
);
634 ek
= svc_expkey_update(&key
,ek
);
636 cache_put(&ek
->h
, &svc_expkey_cache
);
643 * Find the client's export entry matching xdev/xino.
645 static inline struct svc_expkey
*
646 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
650 if (old_valid_dev(dev
)) {
651 mk_fsid_v0(fsidv
, dev
, ino
);
652 return exp_find_key(clp
, 0, fsidv
, NULL
);
654 mk_fsid_v3(fsidv
, dev
, ino
);
655 return exp_find_key(clp
, 3, fsidv
, NULL
);
659 * Find the client's export entry matching fsid
661 static inline struct svc_expkey
*
662 exp_get_fsid_key(svc_client
*clp
, int fsid
)
666 mk_fsid_v1(fsidv
, fsid
);
668 return exp_find_key(clp
, 1, fsidv
, NULL
);
672 exp_get_by_name(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
673 struct cache_req
*reqp
)
675 struct svc_export
*exp
, key
;
682 key
.ex_dentry
= dentry
;
684 exp
= svc_export_lookup(&key
);
686 switch (cache_check(&svc_export_cache
, &exp
->h
, reqp
)) {
689 exp
= ERR_PTR(-EAGAIN
);
699 * Find the export entry for a given dentry.
702 exp_parent(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
703 struct cache_req
*reqp
)
708 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
710 while (exp
== NULL
&& !IS_ROOT(dentry
)) {
711 struct dentry
*parent
;
713 parent
= dget_parent(dentry
);
716 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
723 * Hashtable locking. Write locks are placed only by user processes
724 * wanting to modify export information.
725 * Write locking only done in this file. Read locking
729 static DECLARE_RWSEM(hash_sem
);
734 down_read(&hash_sem
);
740 down_write(&hash_sem
);
750 exp_writeunlock(void)
755 static void exp_fsid_unhash(struct svc_export
*exp
)
757 struct svc_expkey
*ek
;
759 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
762 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
763 if (ek
&& !IS_ERR(ek
)) {
764 ek
->h
.expiry_time
= get_seconds()-1;
765 cache_put(&ek
->h
, &svc_expkey_cache
);
767 svc_expkey_cache
.nextcheck
= get_seconds();
770 static int exp_fsid_hash(svc_client
*clp
, struct svc_export
*exp
)
774 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
777 mk_fsid_v1(fsid
, exp
->ex_fsid
);
778 return exp_set_key(clp
, 1, fsid
, exp
);
781 static int exp_hash(struct auth_domain
*clp
, struct svc_export
*exp
)
784 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
785 dev_t dev
= inode
->i_sb
->s_dev
;
787 if (old_valid_dev(dev
)) {
788 mk_fsid_v0(fsid
, dev
, inode
->i_ino
);
789 return exp_set_key(clp
, 0, fsid
, exp
);
791 mk_fsid_v3(fsid
, dev
, inode
->i_ino
);
792 return exp_set_key(clp
, 3, fsid
, exp
);
795 static void exp_unhash(struct svc_export
*exp
)
797 struct svc_expkey
*ek
;
798 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
800 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
801 if (ek
&& !IS_ERR(ek
)) {
802 ek
->h
.expiry_time
= get_seconds()-1;
803 cache_put(&ek
->h
, &svc_expkey_cache
);
805 svc_expkey_cache
.nextcheck
= get_seconds();
809 * Export a file system.
812 exp_export(struct nfsctl_export
*nxp
)
815 struct svc_export
*exp
= NULL
;
816 struct svc_export
new;
817 struct svc_expkey
*fsid_key
= NULL
;
821 /* Consistency check */
823 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
824 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
827 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
828 nxp
->ex_client
, nxp
->ex_path
,
829 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
832 /* Try to lock the export table for update */
835 /* Look up client info */
836 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
840 /* Look up the dentry */
841 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
846 exp
= exp_get_by_name(clp
, nd
.mnt
, nd
.dentry
, NULL
);
848 /* must make sure there won't be an ex_fsid clash */
849 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
850 (fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
)) &&
853 (fsid_key
->ek_mnt
!= nd
.mnt
|| fsid_key
->ek_dentry
!= nd
.dentry
) )
857 /* just a flags/id/fsid update */
859 exp_fsid_unhash(exp
);
860 exp
->ex_flags
= nxp
->ex_flags
;
861 exp
->ex_anon_uid
= nxp
->ex_anon_uid
;
862 exp
->ex_anon_gid
= nxp
->ex_anon_gid
;
863 exp
->ex_fsid
= nxp
->ex_dev
;
865 err
= exp_fsid_hash(clp
, exp
);
869 err
= check_export(nd
.dentry
->d_inode
, nxp
->ex_flags
);
870 if (err
) goto finish
;
874 dprintk("nfsd: creating export entry %p for client %p\n", exp
, clp
);
876 new.h
.expiry_time
= NEVER
;
880 new.ex_dentry
= nd
.dentry
;
881 new.ex_flags
= nxp
->ex_flags
;
882 new.ex_anon_uid
= nxp
->ex_anon_uid
;
883 new.ex_anon_gid
= nxp
->ex_anon_gid
;
884 new.ex_fsid
= nxp
->ex_dev
;
886 exp
= svc_export_lookup(&new);
888 exp
= svc_export_update(&new, exp
);
893 if (exp_hash(clp
, exp
) ||
894 exp_fsid_hash(clp
, exp
)) {
895 /* failed to create at least one index */
896 exp_do_unexport(exp
);
904 if (fsid_key
&& !IS_ERR(fsid_key
))
905 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
907 auth_domain_put(clp
);
916 * Unexport a file system. The export entry has already
917 * been removed from the client's list of exported fs's.
920 exp_do_unexport(svc_export
*unexp
)
922 unexp
->h
.expiry_time
= get_seconds()-1;
923 svc_export_cache
.nextcheck
= get_seconds();
925 exp_fsid_unhash(unexp
);
933 exp_unexport(struct nfsctl_export
*nxp
)
935 struct auth_domain
*dom
;
940 /* Consistency check */
941 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
942 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
948 dom
= auth_domain_find(nxp
->ex_client
);
950 dprintk("nfsd: unexport couldn't find %s\n", nxp
->ex_client
);
954 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
959 exp
= exp_get_by_name(dom
, nd
.mnt
, nd
.dentry
, NULL
);
964 exp_do_unexport(exp
);
969 auth_domain_put(dom
);
977 * Obtain the root fh on behalf of a client.
978 * This could be done in user space, but I feel that it adds some safety
979 * since its harder to fool a kernel module than a user space program.
982 exp_rootfh(svc_client
*clp
, char *path
, struct knfsd_fh
*f
, int maxsize
)
984 struct svc_export
*exp
;
991 /* NB: we probably ought to check that it's NUL-terminated */
992 if (path_lookup(path
, 0, &nd
)) {
993 printk("nfsd: exp_rootfh path not found %s", path
);
996 inode
= nd
.dentry
->d_inode
;
998 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
999 path
, nd
.dentry
, clp
->name
,
1000 inode
->i_sb
->s_id
, inode
->i_ino
);
1001 exp
= exp_parent(clp
, nd
.mnt
, nd
.dentry
, NULL
);
1003 dprintk("nfsd: exp_rootfh export not found.\n");
1008 * fh must be initialized before calling fh_compose
1010 fh_init(&fh
, maxsize
);
1011 if (fh_compose(&fh
, exp
, nd
.dentry
, NULL
))
1015 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1024 exp_find(struct auth_domain
*clp
, int fsid_type
, u32
*fsidv
,
1025 struct cache_req
*reqp
)
1027 struct svc_export
*exp
;
1028 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
1029 if (!ek
|| IS_ERR(ek
))
1030 return ERR_PTR(PTR_ERR(ek
));
1032 exp
= exp_get_by_name(clp
, ek
->ek_mnt
, ek
->ek_dentry
, reqp
);
1033 cache_put(&ek
->h
, &svc_expkey_cache
);
1035 if (!exp
|| IS_ERR(exp
))
1036 return ERR_PTR(PTR_ERR(exp
));
1042 * Called when we need the filehandle for the root of the pseudofs,
1043 * for a given NFSv4 client. The root is defined to be the
1044 * export point with fsid==0
1047 exp_pseudoroot(struct auth_domain
*clp
, struct svc_fh
*fhp
,
1048 struct cache_req
*creq
)
1050 struct svc_expkey
*fsid_key
;
1051 struct svc_export
*exp
;
1055 mk_fsid_v1(fsidv
, 0);
1057 fsid_key
= exp_find_key(clp
, 1, fsidv
, creq
);
1058 if (IS_ERR(fsid_key
) && PTR_ERR(fsid_key
) == -EAGAIN
)
1059 return nfserr_dropit
;
1060 if (!fsid_key
|| IS_ERR(fsid_key
))
1063 exp
= exp_get_by_name(clp
, fsid_key
->ek_mnt
, fsid_key
->ek_dentry
, creq
);
1066 else if (IS_ERR(exp
))
1067 rv
= nfserrno(PTR_ERR(exp
));
1069 rv
= fh_compose(fhp
, exp
,
1070 fsid_key
->ek_dentry
, NULL
);
1071 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
1077 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
1080 unsigned hash
, export
;
1081 struct cache_head
*ch
;
1084 read_lock(&svc_export_cache
.hash_lock
);
1088 export
= n
& ((1LL<<32) - 1);
1091 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
1094 n
&= ~((1LL<<32) - 1);
1098 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
1099 if (hash
>= EXPORT_HASHMAX
)
1102 return export_table
[hash
];
1105 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1107 struct cache_head
*ch
= p
;
1108 int hash
= (*pos
>> 32);
1112 else if (ch
->next
== NULL
) {
1119 *pos
&= ~((1LL<<32) - 1);
1120 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1124 if (hash
>= EXPORT_HASHMAX
)
1127 return export_table
[hash
];
1130 static void e_stop(struct seq_file
*m
, void *p
)
1132 read_unlock(&svc_export_cache
.hash_lock
);
1136 static struct flags
{
1140 { NFSEXP_READONLY
, {"ro", "rw"}},
1141 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1142 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1143 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1144 { NFSEXP_ASYNC
, {"async", "sync"}},
1145 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1146 { NFSEXP_NOHIDE
, {"nohide", ""}},
1147 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1148 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1149 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1151 { NFSEXP_MSNFS
, {"msnfs", ""}},
1156 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
, uid_t anonu
, uid_t anong
)
1161 for (flg
= expflags
; flg
->flag
; flg
++) {
1162 int state
= (flg
->flag
& flag
)?0:1;
1163 if (*flg
->name
[state
])
1164 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1166 if (flag
& NFSEXP_FSID
)
1167 seq_printf(m
, "%sfsid=%d", first
++?",":"", fsid
);
1168 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1169 seq_printf(m
, "%sanonuid=%d", first
++?",":"", anonu
);
1170 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1171 seq_printf(m
, "%sanongid=%d", first
++?",":"", anong
);
1174 static int e_show(struct seq_file
*m
, void *p
)
1176 struct cache_head
*cp
= p
;
1177 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1180 if (p
== (void *)1) {
1181 seq_puts(m
, "# Version 1.1\n");
1182 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1186 clp
= exp
->ex_client
;
1188 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1190 cache_put(&exp
->h
, &svc_export_cache
);
1191 return svc_export_show(m
, &svc_export_cache
, cp
);
1194 struct seq_operations nfs_exports_op
= {
1202 * Add or modify a client.
1203 * Change requests may involve the list of host addresses. The list of
1204 * exports and possibly existing uid maps are left untouched.
1207 exp_addclient(struct nfsctl_client
*ncp
)
1209 struct auth_domain
*dom
;
1212 /* First, consistency check. */
1214 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1216 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1219 /* Lock the hashtable */
1222 dom
= unix_domain_find(ncp
->cl_ident
);
1228 /* Insert client into hashtable. */
1229 for (i
= 0; i
< ncp
->cl_naddr
; i
++)
1230 auth_unix_add_addr(ncp
->cl_addrlist
[i
], dom
);
1232 auth_unix_forget_old(dom
);
1233 auth_domain_put(dom
);
1244 * Delete a client given an identifier.
1247 exp_delclient(struct nfsctl_client
*ncp
)
1250 struct auth_domain
*dom
;
1253 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1256 /* Lock the hashtable */
1259 dom
= auth_domain_find(ncp
->cl_ident
);
1260 /* just make sure that no addresses work
1261 * and that it will expire soon
1264 err
= auth_unix_forget_old(dom
);
1265 auth_domain_put(dom
);
1274 * Verify that string is non-empty and does not exceed max length.
1277 exp_verify_string(char *cp
, int max
)
1281 for (i
= 0; i
< max
; i
++)
1285 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1290 * Initialize the exports module.
1293 nfsd_export_init(void)
1295 dprintk("nfsd: initializing export module.\n");
1297 cache_register(&svc_export_cache
);
1298 cache_register(&svc_expkey_cache
);
1303 * Flush exports table - called when last nfsd thread is killed
1306 nfsd_export_flush(void)
1309 cache_purge(&svc_expkey_cache
);
1310 cache_purge(&svc_export_cache
);
1315 * Shutdown the exports module.
1318 nfsd_export_shutdown(void)
1321 dprintk("nfsd: shutting down export module.\n");
1325 if (cache_unregister(&svc_expkey_cache
))
1326 printk(KERN_ERR
"nfsd: failed to unregister expkey cache\n");
1327 if (cache_unregister(&svc_export_cache
))
1328 printk(KERN_ERR
"nfsd: failed to unregister export cache\n");
1329 svcauth_unix_purge();
1332 dprintk("nfsd: export shutdown complete.\n");