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>
36 #include <linux/sunrpc/msg_prot.h>
37 #include <linux/sunrpc/gss_api.h>
40 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
42 typedef struct auth_domain svc_client
;
43 typedef struct svc_export svc_export
;
45 static void exp_do_unexport(svc_export
*unexp
);
46 static int exp_verify_string(char *cp
, int max
);
50 * One maps client+vfsmnt+dentry to export options - the export map
51 * The other maps client+filehandle-fragment to export options. - the expkey map
53 * The export options are actually stored in the first map, and the
54 * second map contains a reference to the entry in the first map.
57 #define EXPKEY_HASHBITS 8
58 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
59 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
60 static struct cache_head
*expkey_table
[EXPKEY_HASHMAX
];
62 static void expkey_put(struct kref
*ref
)
64 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
66 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
67 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
))
68 path_put(&key
->ek_path
);
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
= NULL
;
104 if (mesg
[mlen
-1] != '\n')
108 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
114 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
118 dom
= auth_domain_find(buf
);
121 dprintk("found domain %s\n", buf
);
124 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
126 fsidtype
= simple_strtoul(buf
, &ep
, 10);
129 dprintk("found fsidtype %d\n", fsidtype
);
130 if (key_len(fsidtype
)==0) /* invalid type */
132 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
134 dprintk("found fsid length %d\n", len
);
135 if (len
!= key_len(fsidtype
))
138 /* OK, we seem to have a valid key */
140 key
.h
.expiry_time
= get_expiry(&mesg
);
141 if (key
.h
.expiry_time
== 0)
145 key
.ek_fsidtype
= fsidtype
;
146 memcpy(key
.ek_fsid
, buf
, len
);
148 ek
= svc_expkey_lookup(&key
);
153 /* now we want a pathname, or empty meaning NEGATIVE */
155 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
158 dprintk("Path seems to be <%s>\n", buf
);
161 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
162 ek
= svc_expkey_update(&key
, ek
);
167 err
= path_lookup(buf
, 0, &nd
);
171 dprintk("Found the path %s\n", buf
);
172 key
.ek_path
= nd
.path
;
174 ek
= svc_expkey_update(&key
, ek
);
182 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_path
, "\\ \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_path
= item
->ek_path
;
246 path_get(&item
->ek_path
);
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 path_put(&exp
->ex_path
);
335 auth_domain_put(exp
->ex_client
);
336 kfree(exp
->ex_pathname
);
337 nfsd4_fslocs_free(&exp
->ex_fslocs
);
341 static void svc_export_request(struct cache_detail
*cd
,
342 struct cache_head
*h
,
343 char **bpp
, int *blen
)
346 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
349 qword_add(bpp
, blen
, exp
->ex_client
->name
);
350 pth
= d_path(&exp
->ex_path
, *bpp
, *blen
);
352 /* is this correct? */
356 qword_add(bpp
, blen
, pth
);
360 static struct svc_export
*svc_export_update(struct svc_export
*new,
361 struct svc_export
*old
);
362 static struct svc_export
*svc_export_lookup(struct svc_export
*);
364 static int check_export(struct inode
*inode
, int flags
, unsigned char *uuid
)
367 /* We currently export only dirs and regular files.
368 * This is what umountd does.
370 if (!S_ISDIR(inode
->i_mode
) &&
371 !S_ISREG(inode
->i_mode
))
374 /* There are two requirements on a filesystem to be exportable.
375 * 1: We must be able to identify the filesystem from a number.
376 * either a device number (so FS_REQUIRES_DEV needed)
377 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
378 * 2: We must be able to find an inode from a filehandle.
379 * This means that s_export_op must be set.
381 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
382 !(flags
& NFSEXP_FSID
) &&
384 dprintk("exp_export: export of non-dev fs without fsid\n");
388 if (!inode
->i_sb
->s_export_op
||
389 !inode
->i_sb
->s_export_op
->fh_to_dentry
) {
390 dprintk("exp_export: export of invalid fs type.\n");
398 #ifdef CONFIG_NFSD_V4
401 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
)
404 int migrated
, i
, err
;
407 err
= get_int(mesg
, &fsloc
->locations_count
);
410 if (fsloc
->locations_count
> MAX_FS_LOCATIONS
)
412 if (fsloc
->locations_count
== 0)
415 fsloc
->locations
= kzalloc(fsloc
->locations_count
416 * sizeof(struct nfsd4_fs_location
), GFP_KERNEL
);
417 if (!fsloc
->locations
)
419 for (i
=0; i
< fsloc
->locations_count
; i
++) {
420 /* colon separated host list */
422 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
426 fsloc
->locations
[i
].hosts
= kstrdup(buf
, GFP_KERNEL
);
427 if (!fsloc
->locations
[i
].hosts
)
430 /* slash separated path component list */
431 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
435 fsloc
->locations
[i
].path
= kstrdup(buf
, GFP_KERNEL
);
436 if (!fsloc
->locations
[i
].path
)
440 err
= get_int(mesg
, &migrated
);
444 if (migrated
< 0 || migrated
> 1)
446 fsloc
->migrated
= migrated
;
449 nfsd4_fslocs_free(fsloc
);
453 static int secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
456 struct exp_flavor_info
*f
;
458 err
= get_int(mesg
, &listsize
);
461 if (listsize
< 0 || listsize
> MAX_SECINFO_LIST
)
464 for (f
= exp
->ex_flavors
; f
< exp
->ex_flavors
+ listsize
; f
++) {
465 err
= get_int(mesg
, &f
->pseudoflavor
);
469 * Just a quick sanity check; we could also try to check
470 * whether this pseudoflavor is supported, but at worst
471 * an unsupported pseudoflavor on the export would just
472 * be a pseudoflavor that won't match the flavor of any
473 * authenticated request. The administrator will
474 * probably discover the problem when someone fails to
477 if (f
->pseudoflavor
< 0)
479 err
= get_int(mesg
, &f
->flags
);
482 /* Only some flags are allowed to differ between flavors: */
483 if (~NFSEXP_SECINFO_FLAGS
& (f
->flags
^ exp
->ex_flags
))
486 exp
->ex_nflavors
= listsize
;
490 #else /* CONFIG_NFSD_V4 */
492 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
){return 0;}
494 secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
) { return 0; }
497 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
499 /* client path expiry [flags anonuid anongid fsid] */
503 struct auth_domain
*dom
= NULL
;
505 struct svc_export exp
, *expp
;
508 nd
.path
.dentry
= NULL
;
509 exp
.ex_pathname
= NULL
;
512 exp
.ex_fslocs
.locations
= NULL
;
513 exp
.ex_fslocs
.locations_count
= 0;
514 exp
.ex_fslocs
.migrated
= 0;
521 if (mesg
[mlen
-1] != '\n')
525 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
530 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
532 if (len
<= 0) goto out
;
535 dom
= auth_domain_find(buf
);
541 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
543 err
= path_lookup(buf
, 0, &nd
);
544 if (err
) goto out_no_path
;
548 exp
.ex_path
.mnt
= nd
.path
.mnt
;
549 exp
.ex_path
.dentry
= nd
.path
.dentry
;
550 exp
.ex_pathname
= kstrdup(buf
, GFP_KERNEL
);
552 if (!exp
.ex_pathname
)
557 exp
.h
.expiry_time
= get_expiry(&mesg
);
558 if (exp
.h
.expiry_time
== 0)
562 err
= get_int(&mesg
, &an_int
);
563 if (err
== -ENOENT
) {
565 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
567 if (err
|| an_int
< 0) goto out
;
568 exp
.ex_flags
= an_int
;
571 err
= get_int(&mesg
, &an_int
);
573 exp
.ex_anon_uid
= an_int
;
576 err
= get_int(&mesg
, &an_int
);
578 exp
.ex_anon_gid
= an_int
;
581 err
= get_int(&mesg
, &an_int
);
583 exp
.ex_fsid
= an_int
;
585 while ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) > 0) {
586 if (strcmp(buf
, "fsloc") == 0)
587 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
588 else if (strcmp(buf
, "uuid") == 0) {
589 /* expect a 16 byte uuid encoded as \xXXXX... */
590 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
595 kmemdup(buf
, 16, GFP_KERNEL
);
596 if (exp
.ex_uuid
== NULL
)
599 } else if (strcmp(buf
, "secinfo") == 0)
600 err
= secinfo_parse(&mesg
, buf
, &exp
);
602 /* quietly ignore unknown words and anything
603 * following. Newer user-space can try to set
604 * new values, then see what the result was.
611 err
= check_export(nd
.path
.dentry
->d_inode
, exp
.ex_flags
,
616 expp
= svc_export_lookup(&exp
);
618 expp
= svc_export_update(&exp
, expp
);
627 nfsd4_fslocs_free(&exp
.ex_fslocs
);
629 kfree(exp
.ex_pathname
);
634 auth_domain_put(dom
);
639 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
640 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fslocs
);
641 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
);
643 static int svc_export_show(struct seq_file
*m
,
644 struct cache_detail
*cd
,
645 struct cache_head
*h
)
647 struct svc_export
*exp
;
650 seq_puts(m
, "#path domain(flags)\n");
653 exp
= container_of(h
, struct svc_export
, h
);
654 seq_path(m
, &exp
->ex_path
, " \t\n\\");
656 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
658 if (test_bit(CACHE_VALID
, &h
->flags
) &&
659 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
660 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
661 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
664 seq_puts(m
, ",uuid=");
665 for (i
=0; i
<16; i
++) {
668 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
671 show_secinfo(m
, exp
);
676 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
678 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
679 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
680 return orig
->ex_client
== new->ex_client
&&
681 orig
->ex_path
.dentry
== new->ex_path
.dentry
&&
682 orig
->ex_path
.mnt
== new->ex_path
.mnt
;
685 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
687 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
688 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
690 kref_get(&item
->ex_client
->ref
);
691 new->ex_client
= item
->ex_client
;
692 new->ex_path
.dentry
= dget(item
->ex_path
.dentry
);
693 new->ex_path
.mnt
= mntget(item
->ex_path
.mnt
);
694 new->ex_pathname
= NULL
;
695 new->ex_fslocs
.locations
= NULL
;
696 new->ex_fslocs
.locations_count
= 0;
697 new->ex_fslocs
.migrated
= 0;
700 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
702 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
703 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
706 new->ex_flags
= item
->ex_flags
;
707 new->ex_anon_uid
= item
->ex_anon_uid
;
708 new->ex_anon_gid
= item
->ex_anon_gid
;
709 new->ex_fsid
= item
->ex_fsid
;
710 new->ex_uuid
= item
->ex_uuid
;
711 item
->ex_uuid
= NULL
;
712 new->ex_pathname
= item
->ex_pathname
;
713 item
->ex_pathname
= NULL
;
714 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
715 item
->ex_fslocs
.locations
= NULL
;
716 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
717 item
->ex_fslocs
.locations_count
= 0;
718 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
719 item
->ex_fslocs
.migrated
= 0;
720 new->ex_nflavors
= item
->ex_nflavors
;
721 for (i
= 0; i
< MAX_SECINFO_LIST
; i
++) {
722 new->ex_flavors
[i
] = item
->ex_flavors
[i
];
726 static struct cache_head
*svc_export_alloc(void)
728 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
735 struct cache_detail svc_export_cache
= {
736 .owner
= THIS_MODULE
,
737 .hash_size
= EXPORT_HASHMAX
,
738 .hash_table
= export_table
,
739 .name
= "nfsd.export",
740 .cache_put
= svc_export_put
,
741 .cache_request
= svc_export_request
,
742 .cache_parse
= svc_export_parse
,
743 .cache_show
= svc_export_show
,
744 .match
= svc_export_match
,
745 .init
= svc_export_init
,
746 .update
= export_update
,
747 .alloc
= svc_export_alloc
,
750 static struct svc_export
*
751 svc_export_lookup(struct svc_export
*exp
)
753 struct cache_head
*ch
;
755 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
756 hash
^= hash_ptr(exp
->ex_path
.dentry
, EXPORT_HASHBITS
);
757 hash
^= hash_ptr(exp
->ex_path
.mnt
, EXPORT_HASHBITS
);
759 ch
= sunrpc_cache_lookup(&svc_export_cache
, &exp
->h
,
762 return container_of(ch
, struct svc_export
, h
);
767 static struct svc_export
*
768 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
770 struct cache_head
*ch
;
772 hash
= hash_ptr(old
->ex_client
, EXPORT_HASHBITS
);
773 hash
^= hash_ptr(old
->ex_path
.dentry
, EXPORT_HASHBITS
);
774 hash
^= hash_ptr(old
->ex_path
.mnt
, EXPORT_HASHBITS
);
776 ch
= sunrpc_cache_update(&svc_export_cache
, &new->h
,
780 return container_of(ch
, struct svc_export
, h
);
786 static struct svc_expkey
*
787 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
789 struct svc_expkey key
, *ek
;
793 return ERR_PTR(-ENOENT
);
796 key
.ek_fsidtype
= fsid_type
;
797 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
799 ek
= svc_expkey_lookup(&key
);
801 return ERR_PTR(-ENOMEM
);
802 err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
);
808 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
809 struct svc_export
*exp
)
811 struct svc_expkey key
, *ek
;
814 key
.ek_fsidtype
= fsid_type
;
815 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
816 key
.ek_path
= exp
->ex_path
;
817 key
.h
.expiry_time
= NEVER
;
820 ek
= svc_expkey_lookup(&key
);
822 ek
= svc_expkey_update(&key
,ek
);
824 cache_put(&ek
->h
, &svc_expkey_cache
);
831 * Find the client's export entry matching xdev/xino.
833 static inline struct svc_expkey
*
834 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
838 if (old_valid_dev(dev
)) {
839 mk_fsid(FSID_DEV
, fsidv
, dev
, ino
, 0, NULL
);
840 return exp_find_key(clp
, FSID_DEV
, fsidv
, NULL
);
842 mk_fsid(FSID_ENCODE_DEV
, fsidv
, dev
, ino
, 0, NULL
);
843 return exp_find_key(clp
, FSID_ENCODE_DEV
, fsidv
, NULL
);
847 * Find the client's export entry matching fsid
849 static inline struct svc_expkey
*
850 exp_get_fsid_key(svc_client
*clp
, int fsid
)
854 mk_fsid(FSID_NUM
, fsidv
, 0, 0, fsid
, NULL
);
856 return exp_find_key(clp
, FSID_NUM
, fsidv
, NULL
);
859 static svc_export
*exp_get_by_name(svc_client
*clp
, struct vfsmount
*mnt
,
860 struct dentry
*dentry
,
861 struct cache_req
*reqp
)
863 struct svc_export
*exp
, key
;
867 return ERR_PTR(-ENOENT
);
870 key
.ex_path
.mnt
= mnt
;
871 key
.ex_path
.dentry
= dentry
;
873 exp
= svc_export_lookup(&key
);
875 return ERR_PTR(-ENOMEM
);
876 err
= cache_check(&svc_export_cache
, &exp
->h
, reqp
);
883 * Find the export entry for a given dentry.
885 static struct svc_export
*exp_parent(svc_client
*clp
, struct vfsmount
*mnt
,
886 struct dentry
*dentry
,
887 struct cache_req
*reqp
)
892 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
894 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(dentry
)) {
895 struct dentry
*parent
;
897 parent
= dget_parent(dentry
);
900 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
907 * Hashtable locking. Write locks are placed only by user processes
908 * wanting to modify export information.
909 * Write locking only done in this file. Read locking
913 static DECLARE_RWSEM(hash_sem
);
918 down_read(&hash_sem
);
924 down_write(&hash_sem
);
934 exp_writeunlock(void)
939 static void exp_fsid_unhash(struct svc_export
*exp
)
941 struct svc_expkey
*ek
;
943 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
946 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
948 ek
->h
.expiry_time
= get_seconds()-1;
949 cache_put(&ek
->h
, &svc_expkey_cache
);
951 svc_expkey_cache
.nextcheck
= get_seconds();
954 static int exp_fsid_hash(svc_client
*clp
, struct svc_export
*exp
)
958 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
961 mk_fsid(FSID_NUM
, fsid
, 0, 0, exp
->ex_fsid
, NULL
);
962 return exp_set_key(clp
, FSID_NUM
, fsid
, exp
);
965 static int exp_hash(struct auth_domain
*clp
, struct svc_export
*exp
)
968 struct inode
*inode
= exp
->ex_path
.dentry
->d_inode
;
969 dev_t dev
= inode
->i_sb
->s_dev
;
971 if (old_valid_dev(dev
)) {
972 mk_fsid(FSID_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
973 return exp_set_key(clp
, FSID_DEV
, fsid
, exp
);
975 mk_fsid(FSID_ENCODE_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
976 return exp_set_key(clp
, FSID_ENCODE_DEV
, fsid
, exp
);
979 static void exp_unhash(struct svc_export
*exp
)
981 struct svc_expkey
*ek
;
982 struct inode
*inode
= exp
->ex_path
.dentry
->d_inode
;
984 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
986 ek
->h
.expiry_time
= get_seconds()-1;
987 cache_put(&ek
->h
, &svc_expkey_cache
);
989 svc_expkey_cache
.nextcheck
= get_seconds();
993 * Export a file system.
996 exp_export(struct nfsctl_export
*nxp
)
999 struct svc_export
*exp
= NULL
;
1000 struct svc_export
new;
1001 struct svc_expkey
*fsid_key
= NULL
;
1002 struct nameidata nd
;
1005 /* Consistency check */
1007 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1008 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1011 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1012 nxp
->ex_client
, nxp
->ex_path
,
1013 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
1016 /* Try to lock the export table for update */
1019 /* Look up client info */
1020 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
1024 /* Look up the dentry */
1025 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
1030 exp
= exp_get_by_name(clp
, nd
.path
.mnt
, nd
.path
.dentry
, NULL
);
1032 memset(&new, 0, sizeof(new));
1034 /* must make sure there won't be an ex_fsid clash */
1035 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
1036 (!IS_ERR(fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
))) &&
1037 fsid_key
->ek_path
.mnt
&&
1038 (fsid_key
->ek_path
.mnt
!= nd
.path
.mnt
||
1039 fsid_key
->ek_path
.dentry
!= nd
.path
.dentry
))
1043 /* just a flags/id/fsid update */
1045 exp_fsid_unhash(exp
);
1046 exp
->ex_flags
= nxp
->ex_flags
;
1047 exp
->ex_anon_uid
= nxp
->ex_anon_uid
;
1048 exp
->ex_anon_gid
= nxp
->ex_anon_gid
;
1049 exp
->ex_fsid
= nxp
->ex_dev
;
1051 err
= exp_fsid_hash(clp
, exp
);
1055 err
= check_export(nd
.path
.dentry
->d_inode
, nxp
->ex_flags
, NULL
);
1056 if (err
) goto finish
;
1060 dprintk("nfsd: creating export entry %p for client %p\n", exp
, clp
);
1062 new.h
.expiry_time
= NEVER
;
1064 new.ex_pathname
= kstrdup(nxp
->ex_path
, GFP_KERNEL
);
1065 if (!new.ex_pathname
)
1067 new.ex_client
= clp
;
1068 new.ex_path
= nd
.path
;
1069 new.ex_flags
= nxp
->ex_flags
;
1070 new.ex_anon_uid
= nxp
->ex_anon_uid
;
1071 new.ex_anon_gid
= nxp
->ex_anon_gid
;
1072 new.ex_fsid
= nxp
->ex_dev
;
1074 exp
= svc_export_lookup(&new);
1076 exp
= svc_export_update(&new, exp
);
1081 if (exp_hash(clp
, exp
) ||
1082 exp_fsid_hash(clp
, exp
)) {
1083 /* failed to create at least one index */
1084 exp_do_unexport(exp
);
1089 kfree(new.ex_pathname
);
1092 if (fsid_key
&& !IS_ERR(fsid_key
))
1093 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
1096 auth_domain_put(clp
);
1104 * Unexport a file system. The export entry has already
1105 * been removed from the client's list of exported fs's.
1108 exp_do_unexport(svc_export
*unexp
)
1110 unexp
->h
.expiry_time
= get_seconds()-1;
1111 svc_export_cache
.nextcheck
= get_seconds();
1113 exp_fsid_unhash(unexp
);
1121 exp_unexport(struct nfsctl_export
*nxp
)
1123 struct auth_domain
*dom
;
1125 struct nameidata nd
;
1128 /* Consistency check */
1129 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1130 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1136 dom
= auth_domain_find(nxp
->ex_client
);
1138 dprintk("nfsd: unexport couldn't find %s\n", nxp
->ex_client
);
1142 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
1147 exp
= exp_get_by_name(dom
, nd
.path
.mnt
, nd
.path
.dentry
, NULL
);
1152 exp_do_unexport(exp
);
1157 auth_domain_put(dom
);
1165 * Obtain the root fh on behalf of a client.
1166 * This could be done in user space, but I feel that it adds some safety
1167 * since its harder to fool a kernel module than a user space program.
1170 exp_rootfh(svc_client
*clp
, char *path
, struct knfsd_fh
*f
, int maxsize
)
1172 struct svc_export
*exp
;
1173 struct nameidata nd
;
1174 struct inode
*inode
;
1179 /* NB: we probably ought to check that it's NUL-terminated */
1180 if (path_lookup(path
, 0, &nd
)) {
1181 printk("nfsd: exp_rootfh path not found %s", path
);
1184 inode
= nd
.path
.dentry
->d_inode
;
1186 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1187 path
, nd
.path
.dentry
, clp
->name
,
1188 inode
->i_sb
->s_id
, inode
->i_ino
);
1189 exp
= exp_parent(clp
, nd
.path
.mnt
, nd
.path
.dentry
, NULL
);
1196 * fh must be initialized before calling fh_compose
1198 fh_init(&fh
, maxsize
);
1199 if (fh_compose(&fh
, exp
, nd
.path
.dentry
, NULL
))
1203 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1211 static struct svc_export
*exp_find(struct auth_domain
*clp
, int fsid_type
,
1212 u32
*fsidv
, struct cache_req
*reqp
)
1214 struct svc_export
*exp
;
1215 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
1217 return ERR_CAST(ek
);
1219 exp
= exp_get_by_name(clp
, ek
->ek_path
.mnt
, ek
->ek_path
.dentry
, reqp
);
1220 cache_put(&ek
->h
, &svc_expkey_cache
);
1223 return ERR_CAST(exp
);
1227 __be32
check_nfsd_access(struct svc_export
*exp
, struct svc_rqst
*rqstp
)
1229 struct exp_flavor_info
*f
;
1230 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1232 /* legacy gss-only clients are always OK: */
1233 if (exp
->ex_client
== rqstp
->rq_gssclient
)
1235 /* ip-address based client; check sec= export option: */
1236 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
1237 if (f
->pseudoflavor
== rqstp
->rq_flavor
)
1240 /* defaults in absence of sec= options: */
1241 if (exp
->ex_nflavors
== 0) {
1242 if (rqstp
->rq_flavor
== RPC_AUTH_NULL
||
1243 rqstp
->rq_flavor
== RPC_AUTH_UNIX
)
1246 return nfserr_wrongsec
;
1250 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1251 * auth_unix client) if it's available and has secinfo information;
1252 * otherwise, will try to use rq_gssclient.
1254 * Called from functions that handle requests; functions that do work on
1255 * behalf of mountd are passed a single client name to use, and should
1256 * use exp_get_by_name() or exp_find().
1259 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct vfsmount
*mnt
,
1260 struct dentry
*dentry
)
1262 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1264 if (rqstp
->rq_client
== NULL
)
1267 /* First try the auth_unix client: */
1268 exp
= exp_get_by_name(rqstp
->rq_client
, mnt
, dentry
,
1269 &rqstp
->rq_chandle
);
1270 if (PTR_ERR(exp
) == -ENOENT
)
1274 /* If it has secinfo, assume there are no gss/... clients */
1275 if (exp
->ex_nflavors
> 0)
1278 /* Otherwise, try falling back on gss client */
1279 if (rqstp
->rq_gssclient
== NULL
)
1281 gssexp
= exp_get_by_name(rqstp
->rq_gssclient
, mnt
, dentry
,
1282 &rqstp
->rq_chandle
);
1283 if (PTR_ERR(gssexp
) == -ENOENT
)
1291 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1293 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1295 if (rqstp
->rq_client
== NULL
)
1298 /* First try the auth_unix client: */
1299 exp
= exp_find(rqstp
->rq_client
, fsid_type
, fsidv
, &rqstp
->rq_chandle
);
1300 if (PTR_ERR(exp
) == -ENOENT
)
1304 /* If it has secinfo, assume there are no gss/... clients */
1305 if (exp
->ex_nflavors
> 0)
1308 /* Otherwise, try falling back on gss client */
1309 if (rqstp
->rq_gssclient
== NULL
)
1311 gssexp
= exp_find(rqstp
->rq_gssclient
, fsid_type
, fsidv
,
1312 &rqstp
->rq_chandle
);
1313 if (PTR_ERR(gssexp
) == -ENOENT
)
1321 rqst_exp_parent(struct svc_rqst
*rqstp
, struct vfsmount
*mnt
,
1322 struct dentry
*dentry
)
1324 struct svc_export
*exp
;
1327 exp
= rqst_exp_get_by_name(rqstp
, mnt
, dentry
);
1329 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(dentry
)) {
1330 struct dentry
*parent
;
1332 parent
= dget_parent(dentry
);
1335 exp
= rqst_exp_get_by_name(rqstp
, mnt
, dentry
);
1342 * Called when we need the filehandle for the root of the pseudofs,
1343 * for a given NFSv4 client. The root is defined to be the
1344 * export point with fsid==0
1347 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1349 struct svc_export
*exp
;
1353 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1355 exp
= rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1357 return nfserrno(PTR_ERR(exp
));
1358 rv
= fh_compose(fhp
, exp
, exp
->ex_path
.dentry
, NULL
);
1361 rv
= check_nfsd_access(exp
, rqstp
);
1369 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
1370 __acquires(svc_export_cache
.hash_lock
)
1373 unsigned hash
, export
;
1374 struct cache_head
*ch
;
1377 read_lock(&svc_export_cache
.hash_lock
);
1379 return SEQ_START_TOKEN
;
1381 export
= n
& ((1LL<<32) - 1);
1384 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
1387 n
&= ~((1LL<<32) - 1);
1391 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
1392 if (hash
>= EXPORT_HASHMAX
)
1395 return export_table
[hash
];
1398 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1400 struct cache_head
*ch
= p
;
1401 int hash
= (*pos
>> 32);
1403 if (p
== SEQ_START_TOKEN
)
1405 else if (ch
->next
== NULL
) {
1412 *pos
&= ~((1LL<<32) - 1);
1413 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1417 if (hash
>= EXPORT_HASHMAX
)
1420 return export_table
[hash
];
1423 static void e_stop(struct seq_file
*m
, void *p
)
1424 __releases(svc_export_cache
.hash_lock
)
1426 read_unlock(&svc_export_cache
.hash_lock
);
1430 static struct flags
{
1434 { NFSEXP_READONLY
, {"ro", "rw"}},
1435 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1436 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1437 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1438 { NFSEXP_ASYNC
, {"async", "sync"}},
1439 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1440 { NFSEXP_NOHIDE
, {"nohide", ""}},
1441 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1442 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1443 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1445 { NFSEXP_MSNFS
, {"msnfs", ""}},
1450 static void show_expflags(struct seq_file
*m
, int flags
, int mask
)
1453 int state
, first
= 0;
1455 for (flg
= expflags
; flg
->flag
; flg
++) {
1456 if (flg
->flag
& ~mask
)
1458 state
= (flg
->flag
& flags
) ? 0 : 1;
1459 if (*flg
->name
[state
])
1460 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1464 static void show_secinfo_flags(struct seq_file
*m
, int flags
)
1467 show_expflags(m
, flags
, NFSEXP_SECINFO_FLAGS
);
1470 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
)
1472 struct exp_flavor_info
*f
;
1473 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1474 int lastflags
= 0, first
= 0;
1476 if (exp
->ex_nflavors
== 0)
1478 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
1479 if (first
|| f
->flags
!= lastflags
) {
1481 show_secinfo_flags(m
, lastflags
);
1482 seq_printf(m
, ",sec=%d", f
->pseudoflavor
);
1483 lastflags
= f
->flags
;
1485 seq_printf(m
, ":%d", f
->pseudoflavor
);
1488 show_secinfo_flags(m
, lastflags
);
1491 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1492 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1494 show_expflags(m
, flag
, NFSEXP_ALLFLAGS
);
1495 if (flag
& NFSEXP_FSID
)
1496 seq_printf(m
, ",fsid=%d", fsid
);
1497 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1498 seq_printf(m
, ",anonuid=%u", anonu
);
1499 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1500 seq_printf(m
, ",anongid=%u", anong
);
1501 if (fsloc
&& fsloc
->locations_count
> 0) {
1502 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1505 seq_printf(m
, ",%s=", loctype
);
1506 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1508 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1509 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1511 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1513 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1518 static int e_show(struct seq_file
*m
, void *p
)
1520 struct cache_head
*cp
= p
;
1521 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1523 if (p
== SEQ_START_TOKEN
) {
1524 seq_puts(m
, "# Version 1.1\n");
1525 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1530 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1532 cache_put(&exp
->h
, &svc_export_cache
);
1533 return svc_export_show(m
, &svc_export_cache
, cp
);
1536 struct seq_operations nfs_exports_op
= {
1544 * Add or modify a client.
1545 * Change requests may involve the list of host addresses. The list of
1546 * exports and possibly existing uid maps are left untouched.
1549 exp_addclient(struct nfsctl_client
*ncp
)
1551 struct auth_domain
*dom
;
1553 struct in6_addr addr6
;
1555 /* First, consistency check. */
1557 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1559 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1562 /* Lock the hashtable */
1565 dom
= unix_domain_find(ncp
->cl_ident
);
1571 /* Insert client into hashtable. */
1572 for (i
= 0; i
< ncp
->cl_naddr
; i
++) {
1573 ipv6_addr_set_v4mapped(ncp
->cl_addrlist
[i
].s_addr
, &addr6
);
1574 auth_unix_add_addr(&addr6
, dom
);
1576 auth_unix_forget_old(dom
);
1577 auth_domain_put(dom
);
1588 * Delete a client given an identifier.
1591 exp_delclient(struct nfsctl_client
*ncp
)
1594 struct auth_domain
*dom
;
1597 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1600 /* Lock the hashtable */
1603 dom
= auth_domain_find(ncp
->cl_ident
);
1604 /* just make sure that no addresses work
1605 * and that it will expire soon
1608 err
= auth_unix_forget_old(dom
);
1609 auth_domain_put(dom
);
1618 * Verify that string is non-empty and does not exceed max length.
1621 exp_verify_string(char *cp
, int max
)
1625 for (i
= 0; i
< max
; i
++)
1629 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1634 * Initialize the exports module.
1637 nfsd_export_init(void)
1640 dprintk("nfsd: initializing export module.\n");
1642 rv
= cache_register(&svc_export_cache
);
1645 rv
= cache_register(&svc_expkey_cache
);
1647 cache_unregister(&svc_export_cache
);
1653 * Flush exports table - called when last nfsd thread is killed
1656 nfsd_export_flush(void)
1659 cache_purge(&svc_expkey_cache
);
1660 cache_purge(&svc_export_cache
);
1665 * Shutdown the exports module.
1668 nfsd_export_shutdown(void)
1671 dprintk("nfsd: shutting down export module.\n");
1675 cache_unregister(&svc_expkey_cache
);
1676 cache_unregister(&svc_export_cache
);
1677 svcauth_unix_purge();
1680 dprintk("nfsd: export shutdown complete.\n");