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>
39 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
41 typedef struct auth_domain svc_client
;
42 typedef struct svc_export svc_export
;
44 static void exp_do_unexport(svc_export
*unexp
);
45 static int exp_verify_string(char *cp
, int max
);
49 * One maps client+vfsmnt+dentry to export options - the export map
50 * The other maps client+filehandle-fragment to export options. - the expkey map
52 * The export options are actually stored in the first map, and the
53 * second map contains a reference to the entry in the first map.
56 #define EXPKEY_HASHBITS 8
57 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
58 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
59 static struct cache_head
*expkey_table
[EXPKEY_HASHMAX
];
61 static void expkey_put(struct kref
*ref
)
63 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
65 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
66 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
)) {
70 auth_domain_put(key
->ek_client
);
74 static void expkey_request(struct cache_detail
*cd
,
76 char **bpp
, int *blen
)
78 /* client fsidtype \xfsid */
79 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
82 qword_add(bpp
, blen
, ek
->ek_client
->name
);
83 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
84 qword_add(bpp
, blen
, type
);
85 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
89 static struct svc_expkey
*svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
);
90 static struct svc_expkey
*svc_expkey_lookup(struct svc_expkey
*);
91 static struct cache_detail svc_expkey_cache
;
93 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
95 /* client fsidtype fsid [path] */
98 struct auth_domain
*dom
= NULL
;
102 struct svc_expkey key
;
103 struct svc_expkey
*ek
;
105 if (mesg
[mlen
-1] != '\n')
109 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 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) < 0)
157 dprintk("Path seems to be <%s>\n", buf
);
160 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
161 ek
= svc_expkey_update(&key
, ek
);
163 cache_put(&ek
->h
, &svc_expkey_cache
);
167 err
= path_lookup(buf
, 0, &nd
);
171 dprintk("Found the path %s\n", buf
);
173 key
.ek_dentry
= nd
.dentry
;
175 ek
= svc_expkey_update(&key
, ek
);
177 cache_put(&ek
->h
, &svc_expkey_cache
);
185 auth_domain_put(dom
);
190 static int expkey_show(struct seq_file
*m
,
191 struct cache_detail
*cd
,
192 struct cache_head
*h
)
194 struct svc_expkey
*ek
;
198 seq_puts(m
, "#domain fsidtype fsid [path]\n");
201 ek
= container_of(h
, struct svc_expkey
, h
);
202 seq_printf(m
, "%s %d 0x", ek
->ek_client
->name
,
204 for (i
=0; i
< key_len(ek
->ek_fsidtype
)/4; i
++)
205 seq_printf(m
, "%08x", ek
->ek_fsid
[i
]);
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
;
237 memcpy(new->ek_fsid
, item
->ek_fsid
, sizeof(new->ek_fsid
));
240 static inline void expkey_update(struct cache_head
*cnew
,
241 struct cache_head
*citem
)
243 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
244 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
246 new->ek_mnt
= mntget(item
->ek_mnt
);
247 new->ek_dentry
= dget(item
->ek_dentry
);
250 static struct cache_head
*expkey_alloc(void)
252 struct svc_expkey
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
259 static struct cache_detail svc_expkey_cache
= {
260 .owner
= THIS_MODULE
,
261 .hash_size
= EXPKEY_HASHMAX
,
262 .hash_table
= expkey_table
,
264 .cache_put
= expkey_put
,
265 .cache_request
= expkey_request
,
266 .cache_parse
= expkey_parse
,
267 .cache_show
= expkey_show
,
268 .match
= expkey_match
,
270 .update
= expkey_update
,
271 .alloc
= expkey_alloc
,
274 static struct svc_expkey
*
275 svc_expkey_lookup(struct svc_expkey
*item
)
277 struct cache_head
*ch
;
278 int hash
= item
->ek_fsidtype
;
279 char * cp
= (char*)item
->ek_fsid
;
280 int len
= key_len(item
->ek_fsidtype
);
282 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
283 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
284 hash
&= EXPKEY_HASHMASK
;
286 ch
= sunrpc_cache_lookup(&svc_expkey_cache
, &item
->h
,
289 return container_of(ch
, struct svc_expkey
, h
);
294 static struct svc_expkey
*
295 svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
)
297 struct cache_head
*ch
;
298 int hash
= new->ek_fsidtype
;
299 char * cp
= (char*)new->ek_fsid
;
300 int len
= key_len(new->ek_fsidtype
);
302 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
303 hash
^= hash_ptr(new->ek_client
, EXPKEY_HASHBITS
);
304 hash
&= EXPKEY_HASHMASK
;
306 ch
= sunrpc_cache_update(&svc_expkey_cache
, &new->h
,
309 return container_of(ch
, struct svc_expkey
, h
);
315 #define EXPORT_HASHBITS 8
316 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
317 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
319 static struct cache_head
*export_table
[EXPORT_HASHMAX
];
321 static void nfsd4_fslocs_free(struct nfsd4_fs_locations
*fsloc
)
325 for (i
= 0; i
< fsloc
->locations_count
; i
++) {
326 kfree(fsloc
->locations
[i
].path
);
327 kfree(fsloc
->locations
[i
].hosts
);
329 kfree(fsloc
->locations
);
332 static void svc_export_put(struct kref
*ref
)
334 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
335 dput(exp
->ex_dentry
);
337 auth_domain_put(exp
->ex_client
);
339 nfsd4_fslocs_free(&exp
->ex_fslocs
);
343 static void svc_export_request(struct cache_detail
*cd
,
344 struct cache_head
*h
,
345 char **bpp
, int *blen
)
348 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
351 qword_add(bpp
, blen
, exp
->ex_client
->name
);
352 pth
= d_path(exp
->ex_dentry
, exp
->ex_mnt
, *bpp
, *blen
);
354 /* is this correct? */
358 qword_add(bpp
, blen
, pth
);
362 static struct svc_export
*svc_export_update(struct svc_export
*new,
363 struct svc_export
*old
);
364 static struct svc_export
*svc_export_lookup(struct svc_export
*);
366 static int check_export(struct inode
*inode
, int flags
, unsigned char *uuid
)
369 /* We currently export only dirs and regular files.
370 * This is what umountd does.
372 if (!S_ISDIR(inode
->i_mode
) &&
373 !S_ISREG(inode
->i_mode
))
376 /* There are two requirements on a filesystem to be exportable.
377 * 1: We must be able to identify the filesystem from a number.
378 * either a device number (so FS_REQUIRES_DEV needed)
379 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
380 * 2: We must be able to find an inode from a filehandle.
381 * This means that s_export_op must be set.
383 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
384 !(flags
& NFSEXP_FSID
) &&
386 dprintk("exp_export: export of non-dev fs without fsid\n");
389 if (!inode
->i_sb
->s_export_op
) {
390 dprintk("exp_export: export of invalid fs type.\n");
394 /* Ok, we can export it */;
395 if (!inode
->i_sb
->s_export_op
->find_exported_dentry
)
396 inode
->i_sb
->s_export_op
->find_exported_dentry
=
397 find_exported_dentry
;
402 #ifdef CONFIG_NFSD_V4
405 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
)
408 int migrated
, i
, err
;
411 err
= get_int(mesg
, &fsloc
->locations_count
);
414 if (fsloc
->locations_count
> MAX_FS_LOCATIONS
)
416 if (fsloc
->locations_count
== 0)
419 fsloc
->locations
= kzalloc(fsloc
->locations_count
420 * sizeof(struct nfsd4_fs_location
), GFP_KERNEL
);
421 if (!fsloc
->locations
)
423 for (i
=0; i
< fsloc
->locations_count
; i
++) {
424 /* colon separated host list */
426 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
430 fsloc
->locations
[i
].hosts
= kstrdup(buf
, GFP_KERNEL
);
431 if (!fsloc
->locations
[i
].hosts
)
434 /* slash separated path component list */
435 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
439 fsloc
->locations
[i
].path
= kstrdup(buf
, GFP_KERNEL
);
440 if (!fsloc
->locations
[i
].path
)
444 err
= get_int(mesg
, &migrated
);
448 if (migrated
< 0 || migrated
> 1)
450 fsloc
->migrated
= migrated
;
453 nfsd4_fslocs_free(fsloc
);
457 static int secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
460 struct exp_flavor_info
*f
;
462 err
= get_int(mesg
, &listsize
);
465 if (listsize
< 0 || listsize
> MAX_SECINFO_LIST
)
468 for (f
= exp
->ex_flavors
; f
< exp
->ex_flavors
+ listsize
; f
++) {
469 err
= get_int(mesg
, &f
->pseudoflavor
);
473 * Just a quick sanity check; we could also try to check
474 * whether this pseudoflavor is supported, but at worst
475 * an unsupported pseudoflavor on the export would just
476 * be a pseudoflavor that won't match the flavor of any
477 * authenticated request. The administrator will
478 * probably discover the problem when someone fails to
481 if (f
->pseudoflavor
< 0)
483 err
= get_int(mesg
, &f
->flags
);
486 /* Only some flags are allowed to differ between flavors: */
487 if (~NFSEXP_SECINFO_FLAGS
& (f
->flags
^ exp
->ex_flags
))
490 exp
->ex_nflavors
= listsize
;
494 #else /* CONFIG_NFSD_V4 */
496 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
){return 0;}
498 secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
) { return 0; }
501 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
503 /* client path expiry [flags anonuid anongid fsid] */
507 struct auth_domain
*dom
= NULL
;
509 struct svc_export exp
, *expp
;
516 exp
.ex_fslocs
.locations
= NULL
;
517 exp
.ex_fslocs
.locations_count
= 0;
518 exp
.ex_fslocs
.migrated
= 0;
525 if (mesg
[mlen
-1] != '\n')
529 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
534 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
536 if (len
<= 0) goto out
;
539 dom
= auth_domain_find(buf
);
545 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
547 err
= path_lookup(buf
, 0, &nd
);
548 if (err
) goto out_no_path
;
553 exp
.ex_dentry
= nd
.dentry
;
554 exp
.ex_path
= kstrdup(buf
, GFP_KERNEL
);
561 exp
.h
.expiry_time
= get_expiry(&mesg
);
562 if (exp
.h
.expiry_time
== 0)
566 err
= get_int(&mesg
, &an_int
);
568 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
570 if (err
|| an_int
< 0) goto out
;
571 exp
.ex_flags
= an_int
;
574 err
= get_int(&mesg
, &an_int
);
576 exp
.ex_anon_uid
= an_int
;
579 err
= get_int(&mesg
, &an_int
);
581 exp
.ex_anon_gid
= an_int
;
584 err
= get_int(&mesg
, &an_int
);
586 exp
.ex_fsid
= an_int
;
588 while ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) > 0) {
589 if (strcmp(buf
, "fsloc") == 0)
590 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
591 else if (strcmp(buf
, "uuid") == 0) {
592 /* expect a 16 byte uuid encoded as \xXXXX... */
593 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
598 kmemdup(buf
, 16, GFP_KERNEL
);
599 if (exp
.ex_uuid
== NULL
)
602 } else if (strcmp(buf
, "secinfo") == 0)
603 err
= secinfo_parse(&mesg
, buf
, &exp
);
605 /* quietly ignore unknown words and anything
606 * following. Newer user-space can try to set
607 * new values, then see what the result was.
614 err
= check_export(nd
.dentry
->d_inode
, exp
.ex_flags
,
619 expp
= svc_export_lookup(&exp
);
621 expp
= svc_export_update(&exp
, expp
);
630 nfsd4_fslocs_free(&exp
.ex_fslocs
);
637 auth_domain_put(dom
);
642 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
643 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fslocs
);
645 static int svc_export_show(struct seq_file
*m
,
646 struct cache_detail
*cd
,
647 struct cache_head
*h
)
649 struct svc_export
*exp
;
652 seq_puts(m
, "#path domain(flags)\n");
655 exp
= container_of(h
, struct svc_export
, h
);
656 seq_path(m
, exp
->ex_mnt
, exp
->ex_dentry
, " \t\n\\");
658 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
660 if (test_bit(CACHE_VALID
, &h
->flags
) &&
661 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
662 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
663 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
666 seq_puts(m
, ",uuid=");
667 for (i
=0; i
<16; i
++) {
670 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
677 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
679 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
680 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
681 return orig
->ex_client
== new->ex_client
&&
682 orig
->ex_dentry
== new->ex_dentry
&&
683 orig
->ex_mnt
== new->ex_mnt
;
686 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
688 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
689 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
691 kref_get(&item
->ex_client
->ref
);
692 new->ex_client
= item
->ex_client
;
693 new->ex_dentry
= dget(item
->ex_dentry
);
694 new->ex_mnt
= mntget(item
->ex_mnt
);
696 new->ex_fslocs
.locations
= NULL
;
697 new->ex_fslocs
.locations_count
= 0;
698 new->ex_fslocs
.migrated
= 0;
701 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
703 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
704 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
707 new->ex_flags
= item
->ex_flags
;
708 new->ex_anon_uid
= item
->ex_anon_uid
;
709 new->ex_anon_gid
= item
->ex_anon_gid
;
710 new->ex_fsid
= item
->ex_fsid
;
711 new->ex_uuid
= item
->ex_uuid
;
712 item
->ex_uuid
= NULL
;
713 new->ex_path
= item
->ex_path
;
714 item
->ex_path
= NULL
;
715 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
716 item
->ex_fslocs
.locations
= NULL
;
717 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
718 item
->ex_fslocs
.locations_count
= 0;
719 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
720 item
->ex_fslocs
.migrated
= 0;
721 new->ex_nflavors
= item
->ex_nflavors
;
722 for (i
= 0; i
< MAX_SECINFO_LIST
; i
++) {
723 new->ex_flavors
[i
] = item
->ex_flavors
[i
];
727 static struct cache_head
*svc_export_alloc(void)
729 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
736 struct cache_detail svc_export_cache
= {
737 .owner
= THIS_MODULE
,
738 .hash_size
= EXPORT_HASHMAX
,
739 .hash_table
= export_table
,
740 .name
= "nfsd.export",
741 .cache_put
= svc_export_put
,
742 .cache_request
= svc_export_request
,
743 .cache_parse
= svc_export_parse
,
744 .cache_show
= svc_export_show
,
745 .match
= svc_export_match
,
746 .init
= svc_export_init
,
747 .update
= export_update
,
748 .alloc
= svc_export_alloc
,
751 static struct svc_export
*
752 svc_export_lookup(struct svc_export
*exp
)
754 struct cache_head
*ch
;
756 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
757 hash
^= hash_ptr(exp
->ex_dentry
, EXPORT_HASHBITS
);
758 hash
^= hash_ptr(exp
->ex_mnt
, EXPORT_HASHBITS
);
760 ch
= sunrpc_cache_lookup(&svc_export_cache
, &exp
->h
,
763 return container_of(ch
, struct svc_export
, h
);
768 static struct svc_export
*
769 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
771 struct cache_head
*ch
;
773 hash
= hash_ptr(old
->ex_client
, EXPORT_HASHBITS
);
774 hash
^= hash_ptr(old
->ex_dentry
, EXPORT_HASHBITS
);
775 hash
^= hash_ptr(old
->ex_mnt
, EXPORT_HASHBITS
);
777 ch
= sunrpc_cache_update(&svc_export_cache
, &new->h
,
781 return container_of(ch
, struct svc_export
, h
);
787 static struct svc_expkey
*
788 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
790 struct svc_expkey key
, *ek
;
794 return ERR_PTR(-ENOENT
);
797 key
.ek_fsidtype
= fsid_type
;
798 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
800 ek
= svc_expkey_lookup(&key
);
802 return ERR_PTR(-ENOMEM
);
803 err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
);
809 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
810 struct svc_export
*exp
)
812 struct svc_expkey key
, *ek
;
815 key
.ek_fsidtype
= fsid_type
;
816 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
817 key
.ek_mnt
= exp
->ex_mnt
;
818 key
.ek_dentry
= exp
->ex_dentry
;
819 key
.h
.expiry_time
= NEVER
;
822 ek
= svc_expkey_lookup(&key
);
824 ek
= svc_expkey_update(&key
,ek
);
826 cache_put(&ek
->h
, &svc_expkey_cache
);
833 * Find the client's export entry matching xdev/xino.
835 static inline struct svc_expkey
*
836 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
840 if (old_valid_dev(dev
)) {
841 mk_fsid(FSID_DEV
, fsidv
, dev
, ino
, 0, NULL
);
842 return exp_find_key(clp
, FSID_DEV
, fsidv
, NULL
);
844 mk_fsid(FSID_ENCODE_DEV
, fsidv
, dev
, ino
, 0, NULL
);
845 return exp_find_key(clp
, FSID_ENCODE_DEV
, fsidv
, NULL
);
849 * Find the client's export entry matching fsid
851 static inline struct svc_expkey
*
852 exp_get_fsid_key(svc_client
*clp
, int fsid
)
856 mk_fsid(FSID_NUM
, fsidv
, 0, 0, fsid
, NULL
);
858 return exp_find_key(clp
, FSID_NUM
, fsidv
, NULL
);
862 exp_get_by_name(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
863 struct cache_req
*reqp
)
865 struct svc_export
*exp
, key
;
869 return ERR_PTR(-ENOENT
);
873 key
.ex_dentry
= dentry
;
875 exp
= svc_export_lookup(&key
);
877 return ERR_PTR(-ENOMEM
);
878 err
= cache_check(&svc_export_cache
, &exp
->h
, reqp
);
885 * Find the export entry for a given dentry.
888 exp_parent(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
889 struct cache_req
*reqp
)
894 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
896 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(dentry
)) {
897 struct dentry
*parent
;
899 parent
= dget_parent(dentry
);
902 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
909 * Hashtable locking. Write locks are placed only by user processes
910 * wanting to modify export information.
911 * Write locking only done in this file. Read locking
915 static DECLARE_RWSEM(hash_sem
);
920 down_read(&hash_sem
);
926 down_write(&hash_sem
);
936 exp_writeunlock(void)
941 static void exp_fsid_unhash(struct svc_export
*exp
)
943 struct svc_expkey
*ek
;
945 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
948 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
950 ek
->h
.expiry_time
= get_seconds()-1;
951 cache_put(&ek
->h
, &svc_expkey_cache
);
953 svc_expkey_cache
.nextcheck
= get_seconds();
956 static int exp_fsid_hash(svc_client
*clp
, struct svc_export
*exp
)
960 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
963 mk_fsid(FSID_NUM
, fsid
, 0, 0, exp
->ex_fsid
, NULL
);
964 return exp_set_key(clp
, FSID_NUM
, fsid
, exp
);
967 static int exp_hash(struct auth_domain
*clp
, struct svc_export
*exp
)
970 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
971 dev_t dev
= inode
->i_sb
->s_dev
;
973 if (old_valid_dev(dev
)) {
974 mk_fsid(FSID_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
975 return exp_set_key(clp
, FSID_DEV
, fsid
, exp
);
977 mk_fsid(FSID_ENCODE_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
978 return exp_set_key(clp
, FSID_ENCODE_DEV
, fsid
, exp
);
981 static void exp_unhash(struct svc_export
*exp
)
983 struct svc_expkey
*ek
;
984 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
986 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
988 ek
->h
.expiry_time
= get_seconds()-1;
989 cache_put(&ek
->h
, &svc_expkey_cache
);
991 svc_expkey_cache
.nextcheck
= get_seconds();
995 * Export a file system.
998 exp_export(struct nfsctl_export
*nxp
)
1001 struct svc_export
*exp
= NULL
;
1002 struct svc_export
new;
1003 struct svc_expkey
*fsid_key
= NULL
;
1004 struct nameidata nd
;
1007 /* Consistency check */
1009 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1010 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1013 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1014 nxp
->ex_client
, nxp
->ex_path
,
1015 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
1018 /* Try to lock the export table for update */
1021 /* Look up client info */
1022 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
1026 /* Look up the dentry */
1027 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
1032 exp
= exp_get_by_name(clp
, nd
.mnt
, nd
.dentry
, NULL
);
1034 memset(&new, 0, sizeof(new));
1036 /* must make sure there won't be an ex_fsid clash */
1037 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
1038 (!IS_ERR(fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
))) &&
1040 (fsid_key
->ek_mnt
!= nd
.mnt
|| fsid_key
->ek_dentry
!= nd
.dentry
) )
1044 /* just a flags/id/fsid update */
1046 exp_fsid_unhash(exp
);
1047 exp
->ex_flags
= nxp
->ex_flags
;
1048 exp
->ex_anon_uid
= nxp
->ex_anon_uid
;
1049 exp
->ex_anon_gid
= nxp
->ex_anon_gid
;
1050 exp
->ex_fsid
= nxp
->ex_dev
;
1052 err
= exp_fsid_hash(clp
, exp
);
1056 err
= check_export(nd
.dentry
->d_inode
, nxp
->ex_flags
, NULL
);
1057 if (err
) goto finish
;
1061 dprintk("nfsd: creating export entry %p for client %p\n", exp
, clp
);
1063 new.h
.expiry_time
= NEVER
;
1065 new.ex_path
= kstrdup(nxp
->ex_path
, GFP_KERNEL
);
1068 new.ex_client
= clp
;
1069 new.ex_mnt
= nd
.mnt
;
1070 new.ex_dentry
= nd
.dentry
;
1071 new.ex_flags
= nxp
->ex_flags
;
1072 new.ex_anon_uid
= nxp
->ex_anon_uid
;
1073 new.ex_anon_gid
= nxp
->ex_anon_gid
;
1074 new.ex_fsid
= nxp
->ex_dev
;
1076 exp
= svc_export_lookup(&new);
1078 exp
= svc_export_update(&new, exp
);
1083 if (exp_hash(clp
, exp
) ||
1084 exp_fsid_hash(clp
, exp
)) {
1085 /* failed to create at least one index */
1086 exp_do_unexport(exp
);
1095 if (fsid_key
&& !IS_ERR(fsid_key
))
1096 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
1098 auth_domain_put(clp
);
1107 * Unexport a file system. The export entry has already
1108 * been removed from the client's list of exported fs's.
1111 exp_do_unexport(svc_export
*unexp
)
1113 unexp
->h
.expiry_time
= get_seconds()-1;
1114 svc_export_cache
.nextcheck
= get_seconds();
1116 exp_fsid_unhash(unexp
);
1124 exp_unexport(struct nfsctl_export
*nxp
)
1126 struct auth_domain
*dom
;
1128 struct nameidata nd
;
1131 /* Consistency check */
1132 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1133 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1139 dom
= auth_domain_find(nxp
->ex_client
);
1141 dprintk("nfsd: unexport couldn't find %s\n", nxp
->ex_client
);
1145 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
1150 exp
= exp_get_by_name(dom
, nd
.mnt
, nd
.dentry
, NULL
);
1155 exp_do_unexport(exp
);
1160 auth_domain_put(dom
);
1168 * Obtain the root fh on behalf of a client.
1169 * This could be done in user space, but I feel that it adds some safety
1170 * since its harder to fool a kernel module than a user space program.
1173 exp_rootfh(svc_client
*clp
, char *path
, struct knfsd_fh
*f
, int maxsize
)
1175 struct svc_export
*exp
;
1176 struct nameidata nd
;
1177 struct inode
*inode
;
1182 /* NB: we probably ought to check that it's NUL-terminated */
1183 if (path_lookup(path
, 0, &nd
)) {
1184 printk("nfsd: exp_rootfh path not found %s", path
);
1187 inode
= nd
.dentry
->d_inode
;
1189 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1190 path
, nd
.dentry
, clp
->name
,
1191 inode
->i_sb
->s_id
, inode
->i_ino
);
1192 exp
= exp_parent(clp
, nd
.mnt
, nd
.dentry
, NULL
);
1199 * fh must be initialized before calling fh_compose
1201 fh_init(&fh
, maxsize
);
1202 if (fh_compose(&fh
, exp
, nd
.dentry
, NULL
))
1206 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1215 exp_find(struct auth_domain
*clp
, int fsid_type
, u32
*fsidv
,
1216 struct cache_req
*reqp
)
1218 struct svc_export
*exp
;
1219 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
1221 return ERR_PTR(PTR_ERR(ek
));
1223 exp
= exp_get_by_name(clp
, ek
->ek_mnt
, ek
->ek_dentry
, reqp
);
1224 cache_put(&ek
->h
, &svc_expkey_cache
);
1227 return ERR_PTR(PTR_ERR(exp
));
1232 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1233 * auth_unix client) if it's available and has secinfo information;
1234 * otherwise, will try to use rq_gssclient.
1236 * Called from functions that handle requests; functions that do work on
1237 * behalf of mountd are passed a single client name to use, and should
1238 * use exp_get_by_name() or exp_find().
1241 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct vfsmount
*mnt
,
1242 struct dentry
*dentry
)
1244 struct svc_export
*gssexp
, *exp
= NULL
;
1246 if (rqstp
->rq_client
== NULL
)
1249 /* First try the auth_unix client: */
1250 exp
= exp_get_by_name(rqstp
->rq_client
, mnt
, dentry
,
1251 &rqstp
->rq_chandle
);
1252 if (PTR_ERR(exp
) == -ENOENT
)
1256 /* If it has secinfo, assume there are no gss/... clients */
1257 if (exp
->ex_nflavors
> 0)
1260 /* Otherwise, try falling back on gss client */
1261 if (rqstp
->rq_gssclient
== NULL
)
1263 gssexp
= exp_get_by_name(rqstp
->rq_gssclient
, mnt
, dentry
,
1264 &rqstp
->rq_chandle
);
1265 if (PTR_ERR(gssexp
) == -ENOENT
)
1267 if (exp
&& !IS_ERR(exp
))
1273 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1275 struct svc_export
*gssexp
, *exp
= NULL
;
1277 if (rqstp
->rq_client
== NULL
)
1280 /* First try the auth_unix client: */
1281 exp
= exp_find(rqstp
->rq_client
, fsid_type
, fsidv
, &rqstp
->rq_chandle
);
1282 if (PTR_ERR(exp
) == -ENOENT
)
1286 /* If it has secinfo, assume there are no gss/... clients */
1287 if (exp
->ex_nflavors
> 0)
1290 /* Otherwise, try falling back on gss client */
1291 if (rqstp
->rq_gssclient
== NULL
)
1293 gssexp
= exp_find(rqstp
->rq_gssclient
, fsid_type
, fsidv
,
1294 &rqstp
->rq_chandle
);
1295 if (PTR_ERR(gssexp
) == -ENOENT
)
1297 if (exp
&& !IS_ERR(exp
))
1303 rqst_exp_parent(struct svc_rqst
*rqstp
, struct vfsmount
*mnt
,
1304 struct dentry
*dentry
)
1306 struct svc_export
*exp
;
1309 exp
= rqst_exp_get_by_name(rqstp
, mnt
, dentry
);
1311 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(dentry
)) {
1312 struct dentry
*parent
;
1314 parent
= dget_parent(dentry
);
1317 exp
= rqst_exp_get_by_name(rqstp
, mnt
, dentry
);
1324 * Called when we need the filehandle for the root of the pseudofs,
1325 * for a given NFSv4 client. The root is defined to be the
1326 * export point with fsid==0
1329 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1331 struct svc_export
*exp
;
1335 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1337 exp
= rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1338 if (PTR_ERR(exp
) == -ENOENT
)
1341 return nfserrno(PTR_ERR(exp
));
1342 rv
= fh_compose(fhp
, exp
, exp
->ex_dentry
, NULL
);
1349 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
1350 __acquires(svc_export_cache
.hash_lock
)
1353 unsigned hash
, export
;
1354 struct cache_head
*ch
;
1357 read_lock(&svc_export_cache
.hash_lock
);
1359 return SEQ_START_TOKEN
;
1361 export
= n
& ((1LL<<32) - 1);
1364 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
1367 n
&= ~((1LL<<32) - 1);
1371 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
1372 if (hash
>= EXPORT_HASHMAX
)
1375 return export_table
[hash
];
1378 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1380 struct cache_head
*ch
= p
;
1381 int hash
= (*pos
>> 32);
1383 if (p
== SEQ_START_TOKEN
)
1385 else if (ch
->next
== NULL
) {
1392 *pos
&= ~((1LL<<32) - 1);
1393 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1397 if (hash
>= EXPORT_HASHMAX
)
1400 return export_table
[hash
];
1403 static void e_stop(struct seq_file
*m
, void *p
)
1404 __releases(svc_export_cache
.hash_lock
)
1406 read_unlock(&svc_export_cache
.hash_lock
);
1410 static struct flags
{
1414 { NFSEXP_READONLY
, {"ro", "rw"}},
1415 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1416 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1417 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1418 { NFSEXP_ASYNC
, {"async", "sync"}},
1419 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1420 { NFSEXP_NOHIDE
, {"nohide", ""}},
1421 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1422 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1423 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1425 { NFSEXP_MSNFS
, {"msnfs", ""}},
1430 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1431 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1436 for (flg
= expflags
; flg
->flag
; flg
++) {
1437 int state
= (flg
->flag
& flag
)?0:1;
1438 if (*flg
->name
[state
])
1439 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1441 if (flag
& NFSEXP_FSID
)
1442 seq_printf(m
, "%sfsid=%d", first
++?",":"", fsid
);
1443 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1444 seq_printf(m
, "%sanonuid=%d", first
++?",":"", anonu
);
1445 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1446 seq_printf(m
, "%sanongid=%d", first
++?",":"", anong
);
1447 if (fsloc
&& fsloc
->locations_count
> 0) {
1448 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1451 seq_printf(m
, "%s%s=", first
++?",":"", loctype
);
1452 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1454 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1455 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1457 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1459 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1464 static int e_show(struct seq_file
*m
, void *p
)
1466 struct cache_head
*cp
= p
;
1467 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1469 if (p
== SEQ_START_TOKEN
) {
1470 seq_puts(m
, "# Version 1.1\n");
1471 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1476 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1478 cache_put(&exp
->h
, &svc_export_cache
);
1479 return svc_export_show(m
, &svc_export_cache
, cp
);
1482 struct seq_operations nfs_exports_op
= {
1490 * Add or modify a client.
1491 * Change requests may involve the list of host addresses. The list of
1492 * exports and possibly existing uid maps are left untouched.
1495 exp_addclient(struct nfsctl_client
*ncp
)
1497 struct auth_domain
*dom
;
1500 /* First, consistency check. */
1502 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1504 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1507 /* Lock the hashtable */
1510 dom
= unix_domain_find(ncp
->cl_ident
);
1516 /* Insert client into hashtable. */
1517 for (i
= 0; i
< ncp
->cl_naddr
; i
++)
1518 auth_unix_add_addr(ncp
->cl_addrlist
[i
], dom
);
1520 auth_unix_forget_old(dom
);
1521 auth_domain_put(dom
);
1532 * Delete a client given an identifier.
1535 exp_delclient(struct nfsctl_client
*ncp
)
1538 struct auth_domain
*dom
;
1541 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1544 /* Lock the hashtable */
1547 dom
= auth_domain_find(ncp
->cl_ident
);
1548 /* just make sure that no addresses work
1549 * and that it will expire soon
1552 err
= auth_unix_forget_old(dom
);
1553 auth_domain_put(dom
);
1562 * Verify that string is non-empty and does not exceed max length.
1565 exp_verify_string(char *cp
, int max
)
1569 for (i
= 0; i
< max
; i
++)
1573 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1578 * Initialize the exports module.
1581 nfsd_export_init(void)
1583 dprintk("nfsd: initializing export module.\n");
1585 cache_register(&svc_export_cache
);
1586 cache_register(&svc_expkey_cache
);
1591 * Flush exports table - called when last nfsd thread is killed
1594 nfsd_export_flush(void)
1597 cache_purge(&svc_expkey_cache
);
1598 cache_purge(&svc_export_cache
);
1603 * Shutdown the exports module.
1606 nfsd_export_shutdown(void)
1609 dprintk("nfsd: shutting down export module.\n");
1613 if (cache_unregister(&svc_expkey_cache
))
1614 printk(KERN_ERR
"nfsd: failed to unregister expkey cache\n");
1615 if (cache_unregister(&svc_export_cache
))
1616 printk(KERN_ERR
"nfsd: failed to unregister export cache\n");
1617 svcauth_unix_purge();
1620 dprintk("nfsd: export shutdown complete.\n");