1 #define MSNFS /* HACK HACK */
3 * NFS exporting and validation.
5 * We maintain a list of clients, each of which has a list of
6 * exports. To export an fs to a given client, you first have
7 * to create the client entry with NFSCTL_ADDCLIENT, which
8 * creates a client control block and adds it to the hash
9 * table. Then, you call NFSCTL_EXPORT for each fs.
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
15 #include <linux/slab.h>
16 #include <linux/namei.h>
17 #include <linux/module.h>
18 #include <linux/exportfs.h>
20 #include <linux/nfsd/syscall.h>
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
28 typedef struct auth_domain svc_client
;
29 typedef struct svc_export svc_export
;
33 * One maps client+vfsmnt+dentry to export options - the export map
34 * The other maps client+filehandle-fragment to export options. - the expkey map
36 * The export options are actually stored in the first map, and the
37 * second map contains a reference to the entry in the first map.
40 #define EXPKEY_HASHBITS 8
41 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
42 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
43 static struct cache_head
*expkey_table
[EXPKEY_HASHMAX
];
45 static void expkey_put(struct kref
*ref
)
47 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
49 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
50 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
))
51 path_put(&key
->ek_path
);
52 auth_domain_put(key
->ek_client
);
56 static void expkey_request(struct cache_detail
*cd
,
58 char **bpp
, int *blen
)
60 /* client fsidtype \xfsid */
61 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
64 qword_add(bpp
, blen
, ek
->ek_client
->name
);
65 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
66 qword_add(bpp
, blen
, type
);
67 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
71 static int expkey_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
73 return sunrpc_cache_pipe_upcall(cd
, h
, expkey_request
);
76 static struct svc_expkey
*svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
);
77 static struct svc_expkey
*svc_expkey_lookup(struct svc_expkey
*);
78 static struct cache_detail svc_expkey_cache
;
80 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
82 /* client fsidtype fsid [path] */
85 struct auth_domain
*dom
= NULL
;
89 struct svc_expkey key
;
90 struct svc_expkey
*ek
= NULL
;
92 if (mesg
[mlen
-1] != '\n')
96 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
102 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
106 dom
= auth_domain_find(buf
);
109 dprintk("found domain %s\n", buf
);
112 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
114 fsidtype
= simple_strtoul(buf
, &ep
, 10);
117 dprintk("found fsidtype %d\n", fsidtype
);
118 if (key_len(fsidtype
)==0) /* invalid type */
120 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
122 dprintk("found fsid length %d\n", len
);
123 if (len
!= key_len(fsidtype
))
126 /* OK, we seem to have a valid key */
128 key
.h
.expiry_time
= get_expiry(&mesg
);
129 if (key
.h
.expiry_time
== 0)
133 key
.ek_fsidtype
= fsidtype
;
134 memcpy(key
.ek_fsid
, buf
, len
);
136 ek
= svc_expkey_lookup(&key
);
141 /* now we want a pathname, or empty meaning NEGATIVE */
143 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
146 dprintk("Path seems to be <%s>\n", buf
);
149 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
150 ek
= svc_expkey_update(&key
, ek
);
154 err
= kern_path(buf
, 0, &key
.ek_path
);
158 dprintk("Found the path %s\n", buf
);
160 ek
= svc_expkey_update(&key
, ek
);
163 path_put(&key
.ek_path
);
168 cache_put(&ek
->h
, &svc_expkey_cache
);
170 auth_domain_put(dom
);
175 static int expkey_show(struct seq_file
*m
,
176 struct cache_detail
*cd
,
177 struct cache_head
*h
)
179 struct svc_expkey
*ek
;
183 seq_puts(m
, "#domain fsidtype fsid [path]\n");
186 ek
= container_of(h
, struct svc_expkey
, h
);
187 seq_printf(m
, "%s %d 0x", ek
->ek_client
->name
,
189 for (i
=0; i
< key_len(ek
->ek_fsidtype
)/4; i
++)
190 seq_printf(m
, "%08x", ek
->ek_fsid
[i
]);
191 if (test_bit(CACHE_VALID
, &h
->flags
) &&
192 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
194 seq_path(m
, &ek
->ek_path
, "\\ \t\n");
200 static inline int expkey_match (struct cache_head
*a
, struct cache_head
*b
)
202 struct svc_expkey
*orig
= container_of(a
, struct svc_expkey
, h
);
203 struct svc_expkey
*new = container_of(b
, struct svc_expkey
, h
);
205 if (orig
->ek_fsidtype
!= new->ek_fsidtype
||
206 orig
->ek_client
!= new->ek_client
||
207 memcmp(orig
->ek_fsid
, new->ek_fsid
, key_len(orig
->ek_fsidtype
)) != 0)
212 static inline void expkey_init(struct cache_head
*cnew
,
213 struct cache_head
*citem
)
215 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
216 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
218 kref_get(&item
->ek_client
->ref
);
219 new->ek_client
= item
->ek_client
;
220 new->ek_fsidtype
= item
->ek_fsidtype
;
222 memcpy(new->ek_fsid
, item
->ek_fsid
, sizeof(new->ek_fsid
));
225 static inline void expkey_update(struct cache_head
*cnew
,
226 struct cache_head
*citem
)
228 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
229 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
231 new->ek_path
= item
->ek_path
;
232 path_get(&item
->ek_path
);
235 static struct cache_head
*expkey_alloc(void)
237 struct svc_expkey
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
244 static struct cache_detail svc_expkey_cache
= {
245 .owner
= THIS_MODULE
,
246 .hash_size
= EXPKEY_HASHMAX
,
247 .hash_table
= expkey_table
,
249 .cache_put
= expkey_put
,
250 .cache_upcall
= expkey_upcall
,
251 .cache_parse
= expkey_parse
,
252 .cache_show
= expkey_show
,
253 .match
= expkey_match
,
255 .update
= expkey_update
,
256 .alloc
= expkey_alloc
,
260 svc_expkey_hash(struct svc_expkey
*item
)
262 int hash
= item
->ek_fsidtype
;
263 char * cp
= (char*)item
->ek_fsid
;
264 int len
= key_len(item
->ek_fsidtype
);
266 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
267 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
268 hash
&= EXPKEY_HASHMASK
;
272 static struct svc_expkey
*
273 svc_expkey_lookup(struct svc_expkey
*item
)
275 struct cache_head
*ch
;
276 int hash
= svc_expkey_hash(item
);
278 ch
= sunrpc_cache_lookup(&svc_expkey_cache
, &item
->h
,
281 return container_of(ch
, struct svc_expkey
, h
);
286 static struct svc_expkey
*
287 svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
)
289 struct cache_head
*ch
;
290 int hash
= svc_expkey_hash(new);
292 ch
= sunrpc_cache_update(&svc_expkey_cache
, &new->h
,
295 return container_of(ch
, struct svc_expkey
, h
);
301 #define EXPORT_HASHBITS 8
302 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
303 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
305 static struct cache_head
*export_table
[EXPORT_HASHMAX
];
307 static void nfsd4_fslocs_free(struct nfsd4_fs_locations
*fsloc
)
311 for (i
= 0; i
< fsloc
->locations_count
; i
++) {
312 kfree(fsloc
->locations
[i
].path
);
313 kfree(fsloc
->locations
[i
].hosts
);
315 kfree(fsloc
->locations
);
318 static void svc_export_put(struct kref
*ref
)
320 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
321 path_put(&exp
->ex_path
);
322 auth_domain_put(exp
->ex_client
);
323 kfree(exp
->ex_pathname
);
324 nfsd4_fslocs_free(&exp
->ex_fslocs
);
328 static void svc_export_request(struct cache_detail
*cd
,
329 struct cache_head
*h
,
330 char **bpp
, int *blen
)
333 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
336 qword_add(bpp
, blen
, exp
->ex_client
->name
);
337 pth
= d_path(&exp
->ex_path
, *bpp
, *blen
);
339 /* is this correct? */
343 qword_add(bpp
, blen
, pth
);
347 static int svc_export_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
349 return sunrpc_cache_pipe_upcall(cd
, h
, svc_export_request
);
352 static struct svc_export
*svc_export_update(struct svc_export
*new,
353 struct svc_export
*old
);
354 static struct svc_export
*svc_export_lookup(struct svc_export
*);
356 static int check_export(struct inode
*inode
, int *flags
, unsigned char *uuid
)
360 * We currently export only dirs, regular files, and (for v4
361 * pseudoroot) symlinks.
363 if (!S_ISDIR(inode
->i_mode
) &&
364 !S_ISLNK(inode
->i_mode
) &&
365 !S_ISREG(inode
->i_mode
))
369 * Mountd should never pass down a writeable V4ROOT export, but,
372 if (*flags
& NFSEXP_V4ROOT
)
373 *flags
|= NFSEXP_READONLY
;
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 static int secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
457 struct exp_flavor_info
*f
;
459 err
= get_int(mesg
, &listsize
);
462 if (listsize
< 0 || listsize
> MAX_SECINFO_LIST
)
465 for (f
= exp
->ex_flavors
; f
< exp
->ex_flavors
+ listsize
; f
++) {
466 err
= get_int(mesg
, &f
->pseudoflavor
);
470 * XXX: It would be nice to also check whether this
471 * pseudoflavor is supported, so we can discover the
472 * problem at export time instead of when a client fails
475 err
= get_int(mesg
, &f
->flags
);
478 /* Only some flags are allowed to differ between flavors: */
479 if (~NFSEXP_SECINFO_FLAGS
& (f
->flags
^ exp
->ex_flags
))
482 exp
->ex_nflavors
= listsize
;
486 #else /* CONFIG_NFSD_V4 */
488 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
){return 0;}
490 secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
) { return 0; }
493 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
495 /* client path expiry [flags anonuid anongid fsid] */
499 struct auth_domain
*dom
= NULL
;
500 struct svc_export exp
= {}, *expp
;
503 if (mesg
[mlen
-1] != '\n')
507 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
513 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
518 dom
= auth_domain_find(buf
);
524 if ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
527 err
= kern_path(buf
, 0, &exp
.ex_path
);
534 exp
.ex_pathname
= kstrdup(buf
, GFP_KERNEL
);
535 if (!exp
.ex_pathname
)
540 exp
.h
.expiry_time
= get_expiry(&mesg
);
541 if (exp
.h
.expiry_time
== 0)
545 err
= get_int(&mesg
, &an_int
);
546 if (err
== -ENOENT
) {
548 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
550 if (err
|| an_int
< 0)
552 exp
.ex_flags
= an_int
;
555 err
= get_int(&mesg
, &an_int
);
558 exp
.ex_anon_uid
= an_int
;
561 err
= get_int(&mesg
, &an_int
);
564 exp
.ex_anon_gid
= an_int
;
567 err
= get_int(&mesg
, &an_int
);
570 exp
.ex_fsid
= an_int
;
572 while ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) > 0) {
573 if (strcmp(buf
, "fsloc") == 0)
574 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
575 else if (strcmp(buf
, "uuid") == 0) {
576 /* expect a 16 byte uuid encoded as \xXXXX... */
577 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
582 kmemdup(buf
, 16, GFP_KERNEL
);
583 if (exp
.ex_uuid
== NULL
)
586 } else if (strcmp(buf
, "secinfo") == 0)
587 err
= secinfo_parse(&mesg
, buf
, &exp
);
589 /* quietly ignore unknown words and anything
590 * following. Newer user-space can try to set
591 * new values, then see what the result was.
598 err
= check_export(exp
.ex_path
.dentry
->d_inode
, &exp
.ex_flags
,
604 expp
= svc_export_lookup(&exp
);
606 expp
= svc_export_update(&exp
, expp
);
615 nfsd4_fslocs_free(&exp
.ex_fslocs
);
618 kfree(exp
.ex_pathname
);
620 path_put(&exp
.ex_path
);
622 auth_domain_put(dom
);
628 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
629 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fslocs
);
630 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
);
632 static int svc_export_show(struct seq_file
*m
,
633 struct cache_detail
*cd
,
634 struct cache_head
*h
)
636 struct svc_export
*exp
;
639 seq_puts(m
, "#path domain(flags)\n");
642 exp
= container_of(h
, struct svc_export
, h
);
643 seq_path(m
, &exp
->ex_path
, " \t\n\\");
645 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
647 if (test_bit(CACHE_VALID
, &h
->flags
) &&
648 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
649 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
650 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
653 seq_puts(m
, ",uuid=");
654 for (i
=0; i
<16; i
++) {
657 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
660 show_secinfo(m
, exp
);
665 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
667 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
668 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
669 return orig
->ex_client
== new->ex_client
&&
670 orig
->ex_path
.dentry
== new->ex_path
.dentry
&&
671 orig
->ex_path
.mnt
== new->ex_path
.mnt
;
674 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
676 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
677 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
679 kref_get(&item
->ex_client
->ref
);
680 new->ex_client
= item
->ex_client
;
681 new->ex_path
.dentry
= dget(item
->ex_path
.dentry
);
682 new->ex_path
.mnt
= mntget(item
->ex_path
.mnt
);
683 new->ex_pathname
= NULL
;
684 new->ex_fslocs
.locations
= NULL
;
685 new->ex_fslocs
.locations_count
= 0;
686 new->ex_fslocs
.migrated
= 0;
689 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
691 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
692 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
695 new->ex_flags
= item
->ex_flags
;
696 new->ex_anon_uid
= item
->ex_anon_uid
;
697 new->ex_anon_gid
= item
->ex_anon_gid
;
698 new->ex_fsid
= item
->ex_fsid
;
699 new->ex_uuid
= item
->ex_uuid
;
700 item
->ex_uuid
= NULL
;
701 new->ex_pathname
= item
->ex_pathname
;
702 item
->ex_pathname
= NULL
;
703 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
704 item
->ex_fslocs
.locations
= NULL
;
705 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
706 item
->ex_fslocs
.locations_count
= 0;
707 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
708 item
->ex_fslocs
.migrated
= 0;
709 new->ex_nflavors
= item
->ex_nflavors
;
710 for (i
= 0; i
< MAX_SECINFO_LIST
; i
++) {
711 new->ex_flavors
[i
] = item
->ex_flavors
[i
];
715 static struct cache_head
*svc_export_alloc(void)
717 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
724 struct cache_detail svc_export_cache
= {
725 .owner
= THIS_MODULE
,
726 .hash_size
= EXPORT_HASHMAX
,
727 .hash_table
= export_table
,
728 .name
= "nfsd.export",
729 .cache_put
= svc_export_put
,
730 .cache_upcall
= svc_export_upcall
,
731 .cache_parse
= svc_export_parse
,
732 .cache_show
= svc_export_show
,
733 .match
= svc_export_match
,
734 .init
= svc_export_init
,
735 .update
= export_update
,
736 .alloc
= svc_export_alloc
,
740 svc_export_hash(struct svc_export
*exp
)
744 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
745 hash
^= hash_ptr(exp
->ex_path
.dentry
, EXPORT_HASHBITS
);
746 hash
^= hash_ptr(exp
->ex_path
.mnt
, EXPORT_HASHBITS
);
750 static struct svc_export
*
751 svc_export_lookup(struct svc_export
*exp
)
753 struct cache_head
*ch
;
754 int hash
= svc_export_hash(exp
);
756 ch
= sunrpc_cache_lookup(&svc_export_cache
, &exp
->h
,
759 return container_of(ch
, struct svc_export
, h
);
764 static struct svc_export
*
765 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
767 struct cache_head
*ch
;
768 int hash
= svc_export_hash(old
);
770 ch
= sunrpc_cache_update(&svc_export_cache
, &new->h
,
774 return container_of(ch
, struct svc_export
, h
);
780 static struct svc_expkey
*
781 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
783 struct svc_expkey key
, *ek
;
787 return ERR_PTR(-ENOENT
);
790 key
.ek_fsidtype
= fsid_type
;
791 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
793 ek
= svc_expkey_lookup(&key
);
795 return ERR_PTR(-ENOMEM
);
796 err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
);
802 #ifdef CONFIG_NFSD_DEPRECATED
803 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
804 struct svc_export
*exp
)
806 struct svc_expkey key
, *ek
;
809 key
.ek_fsidtype
= fsid_type
;
810 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
811 key
.ek_path
= exp
->ex_path
;
812 key
.h
.expiry_time
= NEVER
;
815 ek
= svc_expkey_lookup(&key
);
817 ek
= svc_expkey_update(&key
,ek
);
819 cache_put(&ek
->h
, &svc_expkey_cache
);
826 * Find the client's export entry matching xdev/xino.
828 static inline struct svc_expkey
*
829 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
833 if (old_valid_dev(dev
)) {
834 mk_fsid(FSID_DEV
, fsidv
, dev
, ino
, 0, NULL
);
835 return exp_find_key(clp
, FSID_DEV
, fsidv
, NULL
);
837 mk_fsid(FSID_ENCODE_DEV
, fsidv
, dev
, ino
, 0, NULL
);
838 return exp_find_key(clp
, FSID_ENCODE_DEV
, fsidv
, NULL
);
842 * Find the client's export entry matching fsid
844 static inline struct svc_expkey
*
845 exp_get_fsid_key(svc_client
*clp
, int fsid
)
849 mk_fsid(FSID_NUM
, fsidv
, 0, 0, fsid
, NULL
);
851 return exp_find_key(clp
, FSID_NUM
, fsidv
, NULL
);
855 static svc_export
*exp_get_by_name(svc_client
*clp
, const struct path
*path
,
856 struct cache_req
*reqp
)
858 struct svc_export
*exp
, key
;
862 return ERR_PTR(-ENOENT
);
867 exp
= svc_export_lookup(&key
);
869 return ERR_PTR(-ENOMEM
);
870 err
= cache_check(&svc_export_cache
, &exp
->h
, reqp
);
877 * Find the export entry for a given dentry.
879 static struct svc_export
*exp_parent(svc_client
*clp
, struct path
*path
)
881 struct dentry
*saved
= dget(path
->dentry
);
882 svc_export
*exp
= exp_get_by_name(clp
, path
, NULL
);
884 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
885 struct dentry
*parent
= dget_parent(path
->dentry
);
887 path
->dentry
= parent
;
888 exp
= exp_get_by_name(clp
, path
, NULL
);
891 path
->dentry
= saved
;
895 #ifdef CONFIG_NFSD_DEPRECATED
897 * Hashtable locking. Write locks are placed only by user processes
898 * wanting to modify export information.
899 * Write locking only done in this file. Read locking
903 static DECLARE_RWSEM(hash_sem
);
908 down_read(&hash_sem
);
914 down_write(&hash_sem
);
924 exp_writeunlock(void)
930 /* hash_sem not needed once deprecated interface is removed */
931 void exp_readlock(void) {}
932 static inline void exp_writelock(void){}
933 void exp_readunlock(void) {}
934 static inline void exp_writeunlock(void){}
938 #ifdef CONFIG_NFSD_DEPRECATED
939 static void exp_do_unexport(svc_export
*unexp
);
940 static int exp_verify_string(char *cp
, int max
);
942 static void exp_fsid_unhash(struct svc_export
*exp
)
944 struct svc_expkey
*ek
;
946 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
949 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
951 sunrpc_invalidate(&ek
->h
, &svc_expkey_cache
);
952 cache_put(&ek
->h
, &svc_expkey_cache
);
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_path
.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_path
.dentry
->d_inode
;
986 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
988 sunrpc_invalidate(&ek
->h
, &svc_expkey_cache
);
989 cache_put(&ek
->h
, &svc_expkey_cache
);
994 * Export a file system.
997 exp_export(struct nfsctl_export
*nxp
)
1000 struct svc_export
*exp
= NULL
;
1001 struct svc_export
new;
1002 struct svc_expkey
*fsid_key
= NULL
;
1006 /* Consistency check */
1008 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1009 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1012 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1013 nxp
->ex_client
, nxp
->ex_path
,
1014 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
1017 /* Try to lock the export table for update */
1020 /* Look up client info */
1021 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
1025 /* Look up the dentry */
1026 err
= kern_path(nxp
->ex_path
, 0, &path
);
1031 exp
= exp_get_by_name(clp
, &path
, NULL
);
1033 memset(&new, 0, sizeof(new));
1035 /* must make sure there won't be an ex_fsid clash */
1036 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
1037 (!IS_ERR(fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
))) &&
1038 fsid_key
->ek_path
.mnt
&&
1039 (fsid_key
->ek_path
.mnt
!= path
.mnt
||
1040 fsid_key
->ek_path
.dentry
!= path
.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(path
.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_pathname
= kstrdup(nxp
->ex_path
, GFP_KERNEL
);
1066 if (!new.ex_pathname
)
1068 new.ex_client
= clp
;
1070 new.ex_flags
= nxp
->ex_flags
;
1071 new.ex_anon_uid
= nxp
->ex_anon_uid
;
1072 new.ex_anon_gid
= nxp
->ex_anon_gid
;
1073 new.ex_fsid
= nxp
->ex_dev
;
1075 exp
= svc_export_lookup(&new);
1077 exp
= svc_export_update(&new, exp
);
1082 if (exp_hash(clp
, exp
) ||
1083 exp_fsid_hash(clp
, exp
)) {
1084 /* failed to create at least one index */
1085 exp_do_unexport(exp
);
1090 kfree(new.ex_pathname
);
1091 if (!IS_ERR_OR_NULL(exp
))
1093 if (!IS_ERR_OR_NULL(fsid_key
))
1094 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
1097 auth_domain_put(clp
);
1105 * Unexport a file system. The export entry has already
1106 * been removed from the client's list of exported fs's.
1109 exp_do_unexport(svc_export
*unexp
)
1111 sunrpc_invalidate(&unexp
->h
, &svc_export_cache
);
1113 exp_fsid_unhash(unexp
);
1121 exp_unexport(struct nfsctl_export
*nxp
)
1123 struct auth_domain
*dom
;
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
= kern_path(nxp
->ex_path
, 0, &path
);
1147 exp
= exp_get_by_name(dom
, &path
, NULL
);
1152 exp_do_unexport(exp
);
1157 auth_domain_put(dom
);
1163 #endif /* CONFIG_NFSD_DEPRECATED */
1166 * Obtain the root fh on behalf of a client.
1167 * This could be done in user space, but I feel that it adds some safety
1168 * since its harder to fool a kernel module than a user space program.
1171 exp_rootfh(svc_client
*clp
, char *name
, struct knfsd_fh
*f
, int maxsize
)
1173 struct svc_export
*exp
;
1175 struct inode
*inode
;
1180 /* NB: we probably ought to check that it's NUL-terminated */
1181 if (kern_path(name
, 0, &path
)) {
1182 printk("nfsd: exp_rootfh path not found %s", name
);
1185 inode
= path
.dentry
->d_inode
;
1187 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1188 name
, path
.dentry
, clp
->name
,
1189 inode
->i_sb
->s_id
, inode
->i_ino
);
1190 exp
= exp_parent(clp
, &path
);
1197 * fh must be initialized before calling fh_compose
1199 fh_init(&fh
, maxsize
);
1200 if (fh_compose(&fh
, exp
, path
.dentry
, NULL
))
1204 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1212 static struct svc_export
*exp_find(struct auth_domain
*clp
, int fsid_type
,
1213 u32
*fsidv
, struct cache_req
*reqp
)
1215 struct svc_export
*exp
;
1216 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
1218 return ERR_CAST(ek
);
1220 exp
= exp_get_by_name(clp
, &ek
->ek_path
, reqp
);
1221 cache_put(&ek
->h
, &svc_expkey_cache
);
1224 return ERR_CAST(exp
);
1228 __be32
check_nfsd_access(struct svc_export
*exp
, struct svc_rqst
*rqstp
)
1230 struct exp_flavor_info
*f
;
1231 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1233 /* legacy gss-only clients are always OK: */
1234 if (exp
->ex_client
== rqstp
->rq_gssclient
)
1236 /* ip-address based client; check sec= export option: */
1237 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
1238 if (f
->pseudoflavor
== rqstp
->rq_flavor
)
1241 /* defaults in absence of sec= options: */
1242 if (exp
->ex_nflavors
== 0) {
1243 if (rqstp
->rq_flavor
== RPC_AUTH_NULL
||
1244 rqstp
->rq_flavor
== RPC_AUTH_UNIX
)
1247 return nfserr_wrongsec
;
1251 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1252 * auth_unix client) if it's available and has secinfo information;
1253 * otherwise, will try to use rq_gssclient.
1255 * Called from functions that handle requests; functions that do work on
1256 * behalf of mountd are passed a single client name to use, and should
1257 * use exp_get_by_name() or exp_find().
1260 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct path
*path
)
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
, path
, &rqstp
->rq_chandle
);
1269 if (PTR_ERR(exp
) == -ENOENT
)
1273 /* If it has secinfo, assume there are no gss/... clients */
1274 if (exp
->ex_nflavors
> 0)
1277 /* Otherwise, try falling back on gss client */
1278 if (rqstp
->rq_gssclient
== NULL
)
1280 gssexp
= exp_get_by_name(rqstp
->rq_gssclient
, path
, &rqstp
->rq_chandle
);
1281 if (PTR_ERR(gssexp
) == -ENOENT
)
1289 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1291 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1293 if (rqstp
->rq_client
== NULL
)
1296 /* First try the auth_unix client: */
1297 exp
= exp_find(rqstp
->rq_client
, fsid_type
, fsidv
, &rqstp
->rq_chandle
);
1298 if (PTR_ERR(exp
) == -ENOENT
)
1302 /* If it has secinfo, assume there are no gss/... clients */
1303 if (exp
->ex_nflavors
> 0)
1306 /* Otherwise, try falling back on gss client */
1307 if (rqstp
->rq_gssclient
== NULL
)
1309 gssexp
= exp_find(rqstp
->rq_gssclient
, fsid_type
, fsidv
,
1310 &rqstp
->rq_chandle
);
1311 if (PTR_ERR(gssexp
) == -ENOENT
)
1319 rqst_exp_parent(struct svc_rqst
*rqstp
, struct path
*path
)
1321 struct dentry
*saved
= dget(path
->dentry
);
1322 struct svc_export
*exp
= rqst_exp_get_by_name(rqstp
, path
);
1324 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
1325 struct dentry
*parent
= dget_parent(path
->dentry
);
1327 path
->dentry
= parent
;
1328 exp
= rqst_exp_get_by_name(rqstp
, path
);
1331 path
->dentry
= saved
;
1335 static struct svc_export
*find_fsidzero_export(struct svc_rqst
*rqstp
)
1339 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1341 return rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1345 * Called when we need the filehandle for the root of the pseudofs,
1346 * for a given NFSv4 client. The root is defined to be the
1347 * export point with fsid==0
1350 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1352 struct svc_export
*exp
;
1355 exp
= find_fsidzero_export(rqstp
);
1357 return nfserrno(PTR_ERR(exp
));
1358 rv
= fh_compose(fhp
, exp
, exp
->ex_path
.dentry
, NULL
);
1361 rv
= check_nfsd_access(exp
, rqstp
);
1371 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
1372 __acquires(svc_export_cache
.hash_lock
)
1375 unsigned hash
, export
;
1376 struct cache_head
*ch
;
1379 read_lock(&svc_export_cache
.hash_lock
);
1381 return SEQ_START_TOKEN
;
1383 export
= n
& ((1LL<<32) - 1);
1386 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
1389 n
&= ~((1LL<<32) - 1);
1393 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
1394 if (hash
>= EXPORT_HASHMAX
)
1397 return export_table
[hash
];
1400 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1402 struct cache_head
*ch
= p
;
1403 int hash
= (*pos
>> 32);
1405 if (p
== SEQ_START_TOKEN
)
1407 else if (ch
->next
== NULL
) {
1414 *pos
&= ~((1LL<<32) - 1);
1415 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1419 if (hash
>= EXPORT_HASHMAX
)
1422 return export_table
[hash
];
1425 static void e_stop(struct seq_file
*m
, void *p
)
1426 __releases(svc_export_cache
.hash_lock
)
1428 read_unlock(&svc_export_cache
.hash_lock
);
1432 static struct flags
{
1436 { NFSEXP_READONLY
, {"ro", "rw"}},
1437 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1438 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1439 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1440 { NFSEXP_ASYNC
, {"async", "sync"}},
1441 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1442 { NFSEXP_NOHIDE
, {"nohide", ""}},
1443 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1444 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1445 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1446 { NFSEXP_V4ROOT
, {"v4root", ""}},
1448 { NFSEXP_MSNFS
, {"msnfs", ""}},
1453 static void show_expflags(struct seq_file
*m
, int flags
, int mask
)
1456 int state
, first
= 0;
1458 for (flg
= expflags
; flg
->flag
; flg
++) {
1459 if (flg
->flag
& ~mask
)
1461 state
= (flg
->flag
& flags
) ? 0 : 1;
1462 if (*flg
->name
[state
])
1463 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1467 static void show_secinfo_flags(struct seq_file
*m
, int flags
)
1470 show_expflags(m
, flags
, NFSEXP_SECINFO_FLAGS
);
1473 static bool secinfo_flags_equal(int f
, int g
)
1475 f
&= NFSEXP_SECINFO_FLAGS
;
1476 g
&= NFSEXP_SECINFO_FLAGS
;
1480 static int show_secinfo_run(struct seq_file
*m
, struct exp_flavor_info
**fp
, struct exp_flavor_info
*end
)
1484 flags
= (*fp
)->flags
;
1485 seq_printf(m
, ",sec=%d", (*fp
)->pseudoflavor
);
1487 while (*fp
!= end
&& secinfo_flags_equal(flags
, (*fp
)->flags
)) {
1488 seq_printf(m
, ":%d", (*fp
)->pseudoflavor
);
1494 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
)
1496 struct exp_flavor_info
*f
;
1497 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1500 if (exp
->ex_nflavors
== 0)
1502 f
= exp
->ex_flavors
;
1503 flags
= show_secinfo_run(m
, &f
, end
);
1504 if (!secinfo_flags_equal(flags
, exp
->ex_flags
))
1505 show_secinfo_flags(m
, flags
);
1507 flags
= show_secinfo_run(m
, &f
, end
);
1508 show_secinfo_flags(m
, flags
);
1512 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1513 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1515 show_expflags(m
, flag
, NFSEXP_ALLFLAGS
);
1516 if (flag
& NFSEXP_FSID
)
1517 seq_printf(m
, ",fsid=%d", fsid
);
1518 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1519 seq_printf(m
, ",anonuid=%u", anonu
);
1520 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1521 seq_printf(m
, ",anongid=%u", anong
);
1522 if (fsloc
&& fsloc
->locations_count
> 0) {
1523 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1526 seq_printf(m
, ",%s=", loctype
);
1527 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1529 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1530 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1532 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1534 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1539 static int e_show(struct seq_file
*m
, void *p
)
1541 struct cache_head
*cp
= p
;
1542 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1544 if (p
== SEQ_START_TOKEN
) {
1545 seq_puts(m
, "# Version 1.1\n");
1546 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1551 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1553 cache_put(&exp
->h
, &svc_export_cache
);
1554 return svc_export_show(m
, &svc_export_cache
, cp
);
1557 const struct seq_operations nfs_exports_op
= {
1564 #ifdef CONFIG_NFSD_DEPRECATED
1566 * Add or modify a client.
1567 * Change requests may involve the list of host addresses. The list of
1568 * exports and possibly existing uid maps are left untouched.
1571 exp_addclient(struct nfsctl_client
*ncp
)
1573 struct auth_domain
*dom
;
1575 struct in6_addr addr6
;
1577 /* First, consistency check. */
1579 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1581 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1584 /* Lock the hashtable */
1587 dom
= unix_domain_find(ncp
->cl_ident
);
1593 /* Insert client into hashtable. */
1594 for (i
= 0; i
< ncp
->cl_naddr
; i
++) {
1595 ipv6_addr_set_v4mapped(ncp
->cl_addrlist
[i
].s_addr
, &addr6
);
1596 auth_unix_add_addr(&init_net
, &addr6
, dom
);
1598 auth_unix_forget_old(dom
);
1599 auth_domain_put(dom
);
1610 * Delete a client given an identifier.
1613 exp_delclient(struct nfsctl_client
*ncp
)
1616 struct auth_domain
*dom
;
1619 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1622 /* Lock the hashtable */
1625 dom
= auth_domain_find(ncp
->cl_ident
);
1626 /* just make sure that no addresses work
1627 * and that it will expire soon
1630 err
= auth_unix_forget_old(dom
);
1631 auth_domain_put(dom
);
1640 * Verify that string is non-empty and does not exceed max length.
1643 exp_verify_string(char *cp
, int max
)
1647 for (i
= 0; i
< max
; i
++)
1651 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1654 #endif /* CONFIG_NFSD_DEPRECATED */
1657 * Initialize the exports module.
1660 nfsd_export_init(void)
1663 dprintk("nfsd: initializing export module.\n");
1665 rv
= cache_register(&svc_export_cache
);
1668 rv
= cache_register(&svc_expkey_cache
);
1670 cache_unregister(&svc_export_cache
);
1676 * Flush exports table - called when last nfsd thread is killed
1679 nfsd_export_flush(void)
1682 cache_purge(&svc_expkey_cache
);
1683 cache_purge(&svc_export_cache
);
1688 * Shutdown the exports module.
1691 nfsd_export_shutdown(void)
1694 dprintk("nfsd: shutting down export module.\n");
1698 cache_unregister(&svc_expkey_cache
);
1699 cache_unregister(&svc_export_cache
);
1700 svcauth_unix_purge();
1703 dprintk("nfsd: export shutdown complete.\n");