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/stat.h>
21 #include <linux/seq_file.h>
22 #include <linux/syscalls.h>
23 #include <linux/rwsem.h>
24 #include <linux/dcache.h>
25 #include <linux/namei.h>
26 #include <linux/mount.h>
27 #include <linux/hash.h>
28 #include <linux/module.h>
29 #include <linux/exportfs.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>
38 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
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
);
129 if (key_len(fsidtype
)==0) /* invalid type */
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
;
197 seq_puts(m
, "#domain fsidtype fsid [path]\n");
200 ek
= container_of(h
, struct svc_expkey
, h
);
201 seq_printf(m
, "%s %d 0x", ek
->ek_client
->name
,
203 for (i
=0; i
< key_len(ek
->ek_fsidtype
)/4; i
++)
204 seq_printf(m
, "%08x", ek
->ek_fsid
[i
]);
205 if (test_bit(CACHE_VALID
, &h
->flags
) &&
206 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
208 seq_path(m
, ek
->ek_mnt
, ek
->ek_dentry
, "\\ \t\n");
214 static inline int expkey_match (struct cache_head
*a
, struct cache_head
*b
)
216 struct svc_expkey
*orig
= container_of(a
, struct svc_expkey
, h
);
217 struct svc_expkey
*new = container_of(b
, struct svc_expkey
, h
);
219 if (orig
->ek_fsidtype
!= new->ek_fsidtype
||
220 orig
->ek_client
!= new->ek_client
||
221 memcmp(orig
->ek_fsid
, new->ek_fsid
, key_len(orig
->ek_fsidtype
)) != 0)
226 static inline void expkey_init(struct cache_head
*cnew
,
227 struct cache_head
*citem
)
229 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
230 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
232 kref_get(&item
->ek_client
->ref
);
233 new->ek_client
= item
->ek_client
;
234 new->ek_fsidtype
= item
->ek_fsidtype
;
236 memcpy(new->ek_fsid
, item
->ek_fsid
, sizeof(new->ek_fsid
));
239 static inline void expkey_update(struct cache_head
*cnew
,
240 struct cache_head
*citem
)
242 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
243 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
245 new->ek_mnt
= mntget(item
->ek_mnt
);
246 new->ek_dentry
= dget(item
->ek_dentry
);
249 static struct cache_head
*expkey_alloc(void)
251 struct svc_expkey
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
258 static struct cache_detail svc_expkey_cache
= {
259 .owner
= THIS_MODULE
,
260 .hash_size
= EXPKEY_HASHMAX
,
261 .hash_table
= expkey_table
,
263 .cache_put
= expkey_put
,
264 .cache_request
= expkey_request
,
265 .cache_parse
= expkey_parse
,
266 .cache_show
= expkey_show
,
267 .match
= expkey_match
,
269 .update
= expkey_update
,
270 .alloc
= expkey_alloc
,
273 static struct svc_expkey
*
274 svc_expkey_lookup(struct svc_expkey
*item
)
276 struct cache_head
*ch
;
277 int hash
= item
->ek_fsidtype
;
278 char * cp
= (char*)item
->ek_fsid
;
279 int len
= key_len(item
->ek_fsidtype
);
281 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
282 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
283 hash
&= EXPKEY_HASHMASK
;
285 ch
= sunrpc_cache_lookup(&svc_expkey_cache
, &item
->h
,
288 return container_of(ch
, struct svc_expkey
, h
);
293 static struct svc_expkey
*
294 svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
)
296 struct cache_head
*ch
;
297 int hash
= new->ek_fsidtype
;
298 char * cp
= (char*)new->ek_fsid
;
299 int len
= key_len(new->ek_fsidtype
);
301 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
302 hash
^= hash_ptr(new->ek_client
, EXPKEY_HASHBITS
);
303 hash
&= EXPKEY_HASHMASK
;
305 ch
= sunrpc_cache_update(&svc_expkey_cache
, &new->h
,
308 return container_of(ch
, struct svc_expkey
, h
);
314 #define EXPORT_HASHBITS 8
315 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
316 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
318 static struct cache_head
*export_table
[EXPORT_HASHMAX
];
320 static void nfsd4_fslocs_free(struct nfsd4_fs_locations
*fsloc
)
324 for (i
= 0; i
< fsloc
->locations_count
; i
++) {
325 kfree(fsloc
->locations
[i
].path
);
326 kfree(fsloc
->locations
[i
].hosts
);
328 kfree(fsloc
->locations
);
331 static void svc_export_put(struct kref
*ref
)
333 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
334 dput(exp
->ex_dentry
);
336 auth_domain_put(exp
->ex_client
);
338 nfsd4_fslocs_free(&exp
->ex_fslocs
);
342 static void svc_export_request(struct cache_detail
*cd
,
343 struct cache_head
*h
,
344 char **bpp
, int *blen
)
347 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
350 qword_add(bpp
, blen
, exp
->ex_client
->name
);
351 pth
= d_path(exp
->ex_dentry
, exp
->ex_mnt
, *bpp
, *blen
);
353 /* is this correct? */
357 qword_add(bpp
, blen
, pth
);
361 static struct svc_export
*svc_export_update(struct svc_export
*new,
362 struct svc_export
*old
);
363 static struct svc_export
*svc_export_lookup(struct svc_export
*);
365 static int check_export(struct inode
*inode
, int flags
, unsigned char *uuid
)
368 /* We currently export only dirs and regular files.
369 * This is what umountd does.
371 if (!S_ISDIR(inode
->i_mode
) &&
372 !S_ISREG(inode
->i_mode
))
375 /* There are two requirements on a filesystem to be exportable.
376 * 1: We must be able to identify the filesystem from a number.
377 * either a device number (so FS_REQUIRES_DEV needed)
378 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
379 * 2: We must be able to find an inode from a filehandle.
380 * This means that s_export_op must be set.
382 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
383 !(flags
& NFSEXP_FSID
) &&
385 dprintk("exp_export: export of non-dev fs without fsid\n");
389 if (!inode
->i_sb
->s_export_op
||
390 !inode
->i_sb
->s_export_op
->fh_to_dentry
) {
391 dprintk("exp_export: export of invalid fs type.\n");
399 #ifdef CONFIG_NFSD_V4
402 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
)
405 int migrated
, i
, err
;
408 err
= get_int(mesg
, &fsloc
->locations_count
);
411 if (fsloc
->locations_count
> MAX_FS_LOCATIONS
)
413 if (fsloc
->locations_count
== 0)
416 fsloc
->locations
= kzalloc(fsloc
->locations_count
417 * sizeof(struct nfsd4_fs_location
), GFP_KERNEL
);
418 if (!fsloc
->locations
)
420 for (i
=0; i
< fsloc
->locations_count
; i
++) {
421 /* colon separated host list */
423 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
427 fsloc
->locations
[i
].hosts
= kstrdup(buf
, GFP_KERNEL
);
428 if (!fsloc
->locations
[i
].hosts
)
431 /* slash separated path component list */
432 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
436 fsloc
->locations
[i
].path
= kstrdup(buf
, GFP_KERNEL
);
437 if (!fsloc
->locations
[i
].path
)
441 err
= get_int(mesg
, &migrated
);
445 if (migrated
< 0 || migrated
> 1)
447 fsloc
->migrated
= migrated
;
450 nfsd4_fslocs_free(fsloc
);
454 #else /* CONFIG_NFSD_V4 */
455 static inline int fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
) { return 0; }
458 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
460 /* client path expiry [flags anonuid anongid fsid] */
464 struct auth_domain
*dom
= NULL
;
466 struct svc_export exp
, *expp
;
473 exp
.ex_fslocs
.locations
= NULL
;
474 exp
.ex_fslocs
.locations_count
= 0;
475 exp
.ex_fslocs
.migrated
= 0;
479 if (mesg
[mlen
-1] != '\n')
483 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
488 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
490 if (len
<= 0) goto out
;
493 dom
= auth_domain_find(buf
);
499 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
501 err
= path_lookup(buf
, 0, &nd
);
502 if (err
) goto out_no_path
;
507 exp
.ex_dentry
= nd
.dentry
;
508 exp
.ex_path
= kstrdup(buf
, GFP_KERNEL
);
515 exp
.h
.expiry_time
= get_expiry(&mesg
);
516 if (exp
.h
.expiry_time
== 0)
520 err
= get_int(&mesg
, &an_int
);
522 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
524 if (err
|| an_int
< 0) goto out
;
525 exp
.ex_flags
= an_int
;
528 err
= get_int(&mesg
, &an_int
);
530 exp
.ex_anon_uid
= an_int
;
533 err
= get_int(&mesg
, &an_int
);
535 exp
.ex_anon_gid
= an_int
;
538 err
= get_int(&mesg
, &an_int
);
540 exp
.ex_fsid
= an_int
;
542 while ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) > 0) {
543 if (strcmp(buf
, "fsloc") == 0)
544 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
545 else if (strcmp(buf
, "uuid") == 0) {
546 /* expect a 16 byte uuid encoded as \xXXXX... */
547 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
552 kmemdup(buf
, 16, GFP_KERNEL
);
553 if (exp
.ex_uuid
== NULL
)
557 /* quietly ignore unknown words and anything
558 * following. Newer user-space can try to set
559 * new values, then see what the result was.
566 err
= check_export(nd
.dentry
->d_inode
, exp
.ex_flags
,
571 expp
= svc_export_lookup(&exp
);
573 expp
= svc_export_update(&exp
, expp
);
582 nfsd4_fslocs_free(&exp
.ex_fslocs
);
589 auth_domain_put(dom
);
594 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
595 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fslocs
);
597 static int svc_export_show(struct seq_file
*m
,
598 struct cache_detail
*cd
,
599 struct cache_head
*h
)
601 struct svc_export
*exp
;
604 seq_puts(m
, "#path domain(flags)\n");
607 exp
= container_of(h
, struct svc_export
, h
);
608 seq_path(m
, exp
->ex_mnt
, exp
->ex_dentry
, " \t\n\\");
610 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
612 if (test_bit(CACHE_VALID
, &h
->flags
) &&
613 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
614 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
615 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
618 seq_puts(m
, ",uuid=");
619 for (i
=0; i
<16; i
++) {
622 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
629 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
631 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
632 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
633 return orig
->ex_client
== new->ex_client
&&
634 orig
->ex_dentry
== new->ex_dentry
&&
635 orig
->ex_mnt
== new->ex_mnt
;
638 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
640 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
641 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
643 kref_get(&item
->ex_client
->ref
);
644 new->ex_client
= item
->ex_client
;
645 new->ex_dentry
= dget(item
->ex_dentry
);
646 new->ex_mnt
= mntget(item
->ex_mnt
);
648 new->ex_fslocs
.locations
= NULL
;
649 new->ex_fslocs
.locations_count
= 0;
650 new->ex_fslocs
.migrated
= 0;
653 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
655 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
656 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
658 new->ex_flags
= item
->ex_flags
;
659 new->ex_anon_uid
= item
->ex_anon_uid
;
660 new->ex_anon_gid
= item
->ex_anon_gid
;
661 new->ex_fsid
= item
->ex_fsid
;
662 new->ex_uuid
= item
->ex_uuid
;
663 item
->ex_uuid
= NULL
;
664 new->ex_path
= item
->ex_path
;
665 item
->ex_path
= NULL
;
666 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
667 item
->ex_fslocs
.locations
= NULL
;
668 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
669 item
->ex_fslocs
.locations_count
= 0;
670 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
671 item
->ex_fslocs
.migrated
= 0;
674 static struct cache_head
*svc_export_alloc(void)
676 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
683 struct cache_detail svc_export_cache
= {
684 .owner
= THIS_MODULE
,
685 .hash_size
= EXPORT_HASHMAX
,
686 .hash_table
= export_table
,
687 .name
= "nfsd.export",
688 .cache_put
= svc_export_put
,
689 .cache_request
= svc_export_request
,
690 .cache_parse
= svc_export_parse
,
691 .cache_show
= svc_export_show
,
692 .match
= svc_export_match
,
693 .init
= svc_export_init
,
694 .update
= export_update
,
695 .alloc
= svc_export_alloc
,
698 static struct svc_export
*
699 svc_export_lookup(struct svc_export
*exp
)
701 struct cache_head
*ch
;
703 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
704 hash
^= hash_ptr(exp
->ex_dentry
, EXPORT_HASHBITS
);
705 hash
^= hash_ptr(exp
->ex_mnt
, EXPORT_HASHBITS
);
707 ch
= sunrpc_cache_lookup(&svc_export_cache
, &exp
->h
,
710 return container_of(ch
, struct svc_export
, h
);
715 static struct svc_export
*
716 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
718 struct cache_head
*ch
;
720 hash
= hash_ptr(old
->ex_client
, EXPORT_HASHBITS
);
721 hash
^= hash_ptr(old
->ex_dentry
, EXPORT_HASHBITS
);
722 hash
^= hash_ptr(old
->ex_mnt
, EXPORT_HASHBITS
);
724 ch
= sunrpc_cache_update(&svc_export_cache
, &new->h
,
728 return container_of(ch
, struct svc_export
, h
);
734 static struct svc_expkey
*
735 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
737 struct svc_expkey key
, *ek
;
741 return ERR_PTR(-ENOENT
);
744 key
.ek_fsidtype
= fsid_type
;
745 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
747 ek
= svc_expkey_lookup(&key
);
749 return ERR_PTR(-ENOMEM
);
750 err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
);
756 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
757 struct svc_export
*exp
)
759 struct svc_expkey key
, *ek
;
762 key
.ek_fsidtype
= fsid_type
;
763 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
764 key
.ek_mnt
= exp
->ex_mnt
;
765 key
.ek_dentry
= exp
->ex_dentry
;
766 key
.h
.expiry_time
= NEVER
;
769 ek
= svc_expkey_lookup(&key
);
771 ek
= svc_expkey_update(&key
,ek
);
773 cache_put(&ek
->h
, &svc_expkey_cache
);
780 * Find the client's export entry matching xdev/xino.
782 static inline struct svc_expkey
*
783 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
787 if (old_valid_dev(dev
)) {
788 mk_fsid(FSID_DEV
, fsidv
, dev
, ino
, 0, NULL
);
789 return exp_find_key(clp
, FSID_DEV
, fsidv
, NULL
);
791 mk_fsid(FSID_ENCODE_DEV
, fsidv
, dev
, ino
, 0, NULL
);
792 return exp_find_key(clp
, FSID_ENCODE_DEV
, fsidv
, NULL
);
796 * Find the client's export entry matching fsid
798 static inline struct svc_expkey
*
799 exp_get_fsid_key(svc_client
*clp
, int fsid
)
803 mk_fsid(FSID_NUM
, fsidv
, 0, 0, fsid
, NULL
);
805 return exp_find_key(clp
, FSID_NUM
, fsidv
, NULL
);
809 exp_get_by_name(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
810 struct cache_req
*reqp
)
812 struct svc_export
*exp
, key
;
816 return ERR_PTR(-ENOENT
);
820 key
.ex_dentry
= dentry
;
822 exp
= svc_export_lookup(&key
);
824 return ERR_PTR(-ENOMEM
);
825 err
= cache_check(&svc_export_cache
, &exp
->h
, reqp
);
832 * Find the export entry for a given dentry.
835 exp_parent(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
836 struct cache_req
*reqp
)
841 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
843 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(dentry
)) {
844 struct dentry
*parent
;
846 parent
= dget_parent(dentry
);
849 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
856 * Hashtable locking. Write locks are placed only by user processes
857 * wanting to modify export information.
858 * Write locking only done in this file. Read locking
862 static DECLARE_RWSEM(hash_sem
);
867 down_read(&hash_sem
);
873 down_write(&hash_sem
);
883 exp_writeunlock(void)
888 static void exp_fsid_unhash(struct svc_export
*exp
)
890 struct svc_expkey
*ek
;
892 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
895 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
897 ek
->h
.expiry_time
= get_seconds()-1;
898 cache_put(&ek
->h
, &svc_expkey_cache
);
900 svc_expkey_cache
.nextcheck
= get_seconds();
903 static int exp_fsid_hash(svc_client
*clp
, struct svc_export
*exp
)
907 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
910 mk_fsid(FSID_NUM
, fsid
, 0, 0, exp
->ex_fsid
, NULL
);
911 return exp_set_key(clp
, FSID_NUM
, fsid
, exp
);
914 static int exp_hash(struct auth_domain
*clp
, struct svc_export
*exp
)
917 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
918 dev_t dev
= inode
->i_sb
->s_dev
;
920 if (old_valid_dev(dev
)) {
921 mk_fsid(FSID_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
922 return exp_set_key(clp
, FSID_DEV
, fsid
, exp
);
924 mk_fsid(FSID_ENCODE_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
925 return exp_set_key(clp
, FSID_ENCODE_DEV
, fsid
, exp
);
928 static void exp_unhash(struct svc_export
*exp
)
930 struct svc_expkey
*ek
;
931 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
933 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
935 ek
->h
.expiry_time
= get_seconds()-1;
936 cache_put(&ek
->h
, &svc_expkey_cache
);
938 svc_expkey_cache
.nextcheck
= get_seconds();
942 * Export a file system.
945 exp_export(struct nfsctl_export
*nxp
)
948 struct svc_export
*exp
= NULL
;
949 struct svc_export
new;
950 struct svc_expkey
*fsid_key
= NULL
;
954 /* Consistency check */
956 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
957 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
960 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
961 nxp
->ex_client
, nxp
->ex_path
,
962 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
965 /* Try to lock the export table for update */
968 /* Look up client info */
969 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
973 /* Look up the dentry */
974 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
979 exp
= exp_get_by_name(clp
, nd
.mnt
, nd
.dentry
, NULL
);
981 memset(&new, 0, sizeof(new));
983 /* must make sure there won't be an ex_fsid clash */
984 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
985 (!IS_ERR(fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
))) &&
987 (fsid_key
->ek_mnt
!= nd
.mnt
|| fsid_key
->ek_dentry
!= nd
.dentry
) )
991 /* just a flags/id/fsid update */
993 exp_fsid_unhash(exp
);
994 exp
->ex_flags
= nxp
->ex_flags
;
995 exp
->ex_anon_uid
= nxp
->ex_anon_uid
;
996 exp
->ex_anon_gid
= nxp
->ex_anon_gid
;
997 exp
->ex_fsid
= nxp
->ex_dev
;
999 err
= exp_fsid_hash(clp
, exp
);
1003 err
= check_export(nd
.dentry
->d_inode
, nxp
->ex_flags
, NULL
);
1004 if (err
) goto finish
;
1008 dprintk("nfsd: creating export entry %p for client %p\n", exp
, clp
);
1010 new.h
.expiry_time
= NEVER
;
1012 new.ex_path
= kstrdup(nxp
->ex_path
, GFP_KERNEL
);
1015 new.ex_client
= clp
;
1016 new.ex_mnt
= nd
.mnt
;
1017 new.ex_dentry
= nd
.dentry
;
1018 new.ex_flags
= nxp
->ex_flags
;
1019 new.ex_anon_uid
= nxp
->ex_anon_uid
;
1020 new.ex_anon_gid
= nxp
->ex_anon_gid
;
1021 new.ex_fsid
= nxp
->ex_dev
;
1023 exp
= svc_export_lookup(&new);
1025 exp
= svc_export_update(&new, exp
);
1030 if (exp_hash(clp
, exp
) ||
1031 exp_fsid_hash(clp
, exp
)) {
1032 /* failed to create at least one index */
1033 exp_do_unexport(exp
);
1042 if (fsid_key
&& !IS_ERR(fsid_key
))
1043 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
1045 auth_domain_put(clp
);
1054 * Unexport a file system. The export entry has already
1055 * been removed from the client's list of exported fs's.
1058 exp_do_unexport(svc_export
*unexp
)
1060 unexp
->h
.expiry_time
= get_seconds()-1;
1061 svc_export_cache
.nextcheck
= get_seconds();
1063 exp_fsid_unhash(unexp
);
1071 exp_unexport(struct nfsctl_export
*nxp
)
1073 struct auth_domain
*dom
;
1075 struct nameidata nd
;
1078 /* Consistency check */
1079 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1080 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1086 dom
= auth_domain_find(nxp
->ex_client
);
1088 dprintk("nfsd: unexport couldn't find %s\n", nxp
->ex_client
);
1092 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
1097 exp
= exp_get_by_name(dom
, nd
.mnt
, nd
.dentry
, NULL
);
1102 exp_do_unexport(exp
);
1107 auth_domain_put(dom
);
1115 * Obtain the root fh on behalf of a client.
1116 * This could be done in user space, but I feel that it adds some safety
1117 * since its harder to fool a kernel module than a user space program.
1120 exp_rootfh(svc_client
*clp
, char *path
, struct knfsd_fh
*f
, int maxsize
)
1122 struct svc_export
*exp
;
1123 struct nameidata nd
;
1124 struct inode
*inode
;
1129 /* NB: we probably ought to check that it's NUL-terminated */
1130 if (path_lookup(path
, 0, &nd
)) {
1131 printk("nfsd: exp_rootfh path not found %s", path
);
1134 inode
= nd
.dentry
->d_inode
;
1136 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1137 path
, nd
.dentry
, clp
->name
,
1138 inode
->i_sb
->s_id
, inode
->i_ino
);
1139 exp
= exp_parent(clp
, nd
.mnt
, nd
.dentry
, NULL
);
1146 * fh must be initialized before calling fh_compose
1148 fh_init(&fh
, maxsize
);
1149 if (fh_compose(&fh
, exp
, nd
.dentry
, NULL
))
1153 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1162 exp_find(struct auth_domain
*clp
, int fsid_type
, u32
*fsidv
,
1163 struct cache_req
*reqp
)
1165 struct svc_export
*exp
;
1166 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
1168 return ERR_PTR(PTR_ERR(ek
));
1170 exp
= exp_get_by_name(clp
, ek
->ek_mnt
, ek
->ek_dentry
, reqp
);
1171 cache_put(&ek
->h
, &svc_expkey_cache
);
1174 return ERR_PTR(PTR_ERR(exp
));
1179 * Called from functions that handle requests; functions that do work on
1180 * behalf of mountd are passed a single client name to use, and should
1181 * use exp_get_by_name() or exp_find().
1184 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct vfsmount
*mnt
,
1185 struct dentry
*dentry
)
1187 struct auth_domain
*clp
;
1189 clp
= rqstp
->rq_gssclient
? rqstp
->rq_gssclient
: rqstp
->rq_client
;
1190 return exp_get_by_name(clp
, mnt
, dentry
, &rqstp
->rq_chandle
);
1194 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1196 struct auth_domain
*clp
;
1198 clp
= rqstp
->rq_gssclient
? rqstp
->rq_gssclient
: rqstp
->rq_client
;
1199 return exp_find(clp
, fsid_type
, fsidv
, &rqstp
->rq_chandle
);
1203 rqst_exp_parent(struct svc_rqst
*rqstp
, struct vfsmount
*mnt
,
1204 struct dentry
*dentry
)
1206 struct auth_domain
*clp
;
1208 clp
= rqstp
->rq_gssclient
? rqstp
->rq_gssclient
: rqstp
->rq_client
;
1209 return exp_parent(rqstp
->rq_client
, mnt
, dentry
, &rqstp
->rq_chandle
);
1213 * Called when we need the filehandle for the root of the pseudofs,
1214 * for a given NFSv4 client. The root is defined to be the
1215 * export point with fsid==0
1218 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1220 struct svc_export
*exp
;
1224 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1226 exp
= rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1227 if (PTR_ERR(exp
) == -ENOENT
)
1230 return nfserrno(PTR_ERR(exp
));
1231 rv
= fh_compose(fhp
, exp
, exp
->ex_dentry
, NULL
);
1238 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
1239 __acquires(svc_export_cache
.hash_lock
)
1242 unsigned hash
, export
;
1243 struct cache_head
*ch
;
1246 read_lock(&svc_export_cache
.hash_lock
);
1248 return SEQ_START_TOKEN
;
1250 export
= n
& ((1LL<<32) - 1);
1253 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
1256 n
&= ~((1LL<<32) - 1);
1260 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
1261 if (hash
>= EXPORT_HASHMAX
)
1264 return export_table
[hash
];
1267 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1269 struct cache_head
*ch
= p
;
1270 int hash
= (*pos
>> 32);
1272 if (p
== SEQ_START_TOKEN
)
1274 else if (ch
->next
== NULL
) {
1281 *pos
&= ~((1LL<<32) - 1);
1282 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1286 if (hash
>= EXPORT_HASHMAX
)
1289 return export_table
[hash
];
1292 static void e_stop(struct seq_file
*m
, void *p
)
1293 __releases(svc_export_cache
.hash_lock
)
1295 read_unlock(&svc_export_cache
.hash_lock
);
1299 static struct flags
{
1303 { NFSEXP_READONLY
, {"ro", "rw"}},
1304 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1305 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1306 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1307 { NFSEXP_ASYNC
, {"async", "sync"}},
1308 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1309 { NFSEXP_NOHIDE
, {"nohide", ""}},
1310 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1311 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1312 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1314 { NFSEXP_MSNFS
, {"msnfs", ""}},
1319 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1320 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1325 for (flg
= expflags
; flg
->flag
; flg
++) {
1326 int state
= (flg
->flag
& flag
)?0:1;
1327 if (*flg
->name
[state
])
1328 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1330 if (flag
& NFSEXP_FSID
)
1331 seq_printf(m
, "%sfsid=%d", first
++?",":"", fsid
);
1332 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1333 seq_printf(m
, "%sanonuid=%d", first
++?",":"", anonu
);
1334 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1335 seq_printf(m
, "%sanongid=%d", first
++?",":"", anong
);
1336 if (fsloc
&& fsloc
->locations_count
> 0) {
1337 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1340 seq_printf(m
, "%s%s=", first
++?",":"", loctype
);
1341 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1343 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1344 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1346 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1348 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1353 static int e_show(struct seq_file
*m
, void *p
)
1355 struct cache_head
*cp
= p
;
1356 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1358 if (p
== SEQ_START_TOKEN
) {
1359 seq_puts(m
, "# Version 1.1\n");
1360 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1365 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1367 cache_put(&exp
->h
, &svc_export_cache
);
1368 return svc_export_show(m
, &svc_export_cache
, cp
);
1371 struct seq_operations nfs_exports_op
= {
1379 * Add or modify a client.
1380 * Change requests may involve the list of host addresses. The list of
1381 * exports and possibly existing uid maps are left untouched.
1384 exp_addclient(struct nfsctl_client
*ncp
)
1386 struct auth_domain
*dom
;
1388 struct in6_addr addr6
;
1390 /* First, consistency check. */
1392 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1394 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1397 /* Lock the hashtable */
1400 dom
= unix_domain_find(ncp
->cl_ident
);
1406 /* Insert client into hashtable. */
1407 for (i
= 0; i
< ncp
->cl_naddr
; i
++) {
1408 ipv6_addr_set_v4mapped(ncp
->cl_addrlist
[i
].s_addr
, &addr6
);
1409 auth_unix_add_addr(&addr6
, dom
);
1411 auth_unix_forget_old(dom
);
1412 auth_domain_put(dom
);
1423 * Delete a client given an identifier.
1426 exp_delclient(struct nfsctl_client
*ncp
)
1429 struct auth_domain
*dom
;
1432 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1435 /* Lock the hashtable */
1438 dom
= auth_domain_find(ncp
->cl_ident
);
1439 /* just make sure that no addresses work
1440 * and that it will expire soon
1443 err
= auth_unix_forget_old(dom
);
1444 auth_domain_put(dom
);
1453 * Verify that string is non-empty and does not exceed max length.
1456 exp_verify_string(char *cp
, int max
)
1460 for (i
= 0; i
< max
; i
++)
1464 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1469 * Initialize the exports module.
1472 nfsd_export_init(void)
1474 dprintk("nfsd: initializing export module.\n");
1476 cache_register(&svc_export_cache
);
1477 cache_register(&svc_expkey_cache
);
1482 * Flush exports table - called when last nfsd thread is killed
1485 nfsd_export_flush(void)
1488 cache_purge(&svc_expkey_cache
);
1489 cache_purge(&svc_export_cache
);
1494 * Shutdown the exports module.
1497 nfsd_export_shutdown(void)
1500 dprintk("nfsd: shutting down export module.\n");
1504 if (cache_unregister(&svc_expkey_cache
))
1505 printk(KERN_ERR
"nfsd: failed to unregister expkey cache\n");
1506 if (cache_unregister(&svc_export_cache
))
1507 printk(KERN_ERR
"nfsd: failed to unregister export cache\n");
1508 svcauth_unix_purge();
1511 dprintk("nfsd: export shutdown complete.\n");