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
;
31 static void exp_do_unexport(svc_export
*unexp
);
32 static int exp_verify_string(char *cp
, int max
);
36 * One maps client+vfsmnt+dentry to export options - the export map
37 * The other maps client+filehandle-fragment to export options. - the expkey map
39 * The export options are actually stored in the first map, and the
40 * second map contains a reference to the entry in the first map.
43 #define EXPKEY_HASHBITS 8
44 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
45 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
46 static struct cache_head
*expkey_table
[EXPKEY_HASHMAX
];
48 static void expkey_put(struct kref
*ref
)
50 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
52 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
53 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
))
54 path_put(&key
->ek_path
);
55 auth_domain_put(key
->ek_client
);
59 static void expkey_request(struct cache_detail
*cd
,
61 char **bpp
, int *blen
)
63 /* client fsidtype \xfsid */
64 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
67 qword_add(bpp
, blen
, ek
->ek_client
->name
);
68 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
69 qword_add(bpp
, blen
, type
);
70 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
74 static int expkey_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
76 return sunrpc_cache_pipe_upcall(cd
, h
, expkey_request
);
79 static struct svc_expkey
*svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
);
80 static struct svc_expkey
*svc_expkey_lookup(struct svc_expkey
*);
81 static struct cache_detail svc_expkey_cache
;
83 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
85 /* client fsidtype fsid [path] */
88 struct auth_domain
*dom
= NULL
;
92 struct svc_expkey key
;
93 struct svc_expkey
*ek
= NULL
;
95 if (mesg
[mlen
-1] != '\n')
99 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
105 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
109 dom
= auth_domain_find(buf
);
112 dprintk("found domain %s\n", buf
);
115 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
117 fsidtype
= simple_strtoul(buf
, &ep
, 10);
120 dprintk("found fsidtype %d\n", fsidtype
);
121 if (key_len(fsidtype
)==0) /* invalid type */
123 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
125 dprintk("found fsid length %d\n", len
);
126 if (len
!= key_len(fsidtype
))
129 /* OK, we seem to have a valid key */
131 key
.h
.expiry_time
= get_expiry(&mesg
);
132 if (key
.h
.expiry_time
== 0)
136 key
.ek_fsidtype
= fsidtype
;
137 memcpy(key
.ek_fsid
, buf
, len
);
139 ek
= svc_expkey_lookup(&key
);
144 /* now we want a pathname, or empty meaning NEGATIVE */
146 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
149 dprintk("Path seems to be <%s>\n", buf
);
152 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
153 ek
= svc_expkey_update(&key
, ek
);
157 err
= kern_path(buf
, 0, &key
.ek_path
);
161 dprintk("Found the path %s\n", buf
);
163 ek
= svc_expkey_update(&key
, ek
);
166 path_put(&key
.ek_path
);
171 cache_put(&ek
->h
, &svc_expkey_cache
);
173 auth_domain_put(dom
);
178 static int expkey_show(struct seq_file
*m
,
179 struct cache_detail
*cd
,
180 struct cache_head
*h
)
182 struct svc_expkey
*ek
;
186 seq_puts(m
, "#domain fsidtype fsid [path]\n");
189 ek
= container_of(h
, struct svc_expkey
, h
);
190 seq_printf(m
, "%s %d 0x", ek
->ek_client
->name
,
192 for (i
=0; i
< key_len(ek
->ek_fsidtype
)/4; i
++)
193 seq_printf(m
, "%08x", ek
->ek_fsid
[i
]);
194 if (test_bit(CACHE_VALID
, &h
->flags
) &&
195 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
197 seq_path(m
, &ek
->ek_path
, "\\ \t\n");
203 static inline int expkey_match (struct cache_head
*a
, struct cache_head
*b
)
205 struct svc_expkey
*orig
= container_of(a
, struct svc_expkey
, h
);
206 struct svc_expkey
*new = container_of(b
, struct svc_expkey
, h
);
208 if (orig
->ek_fsidtype
!= new->ek_fsidtype
||
209 orig
->ek_client
!= new->ek_client
||
210 memcmp(orig
->ek_fsid
, new->ek_fsid
, key_len(orig
->ek_fsidtype
)) != 0)
215 static inline void expkey_init(struct cache_head
*cnew
,
216 struct cache_head
*citem
)
218 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
219 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
221 kref_get(&item
->ek_client
->ref
);
222 new->ek_client
= item
->ek_client
;
223 new->ek_fsidtype
= item
->ek_fsidtype
;
225 memcpy(new->ek_fsid
, item
->ek_fsid
, sizeof(new->ek_fsid
));
228 static inline void expkey_update(struct cache_head
*cnew
,
229 struct cache_head
*citem
)
231 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
232 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
234 new->ek_path
= item
->ek_path
;
235 path_get(&item
->ek_path
);
238 static struct cache_head
*expkey_alloc(void)
240 struct svc_expkey
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
247 static struct cache_detail svc_expkey_cache
= {
248 .owner
= THIS_MODULE
,
249 .hash_size
= EXPKEY_HASHMAX
,
250 .hash_table
= expkey_table
,
252 .cache_put
= expkey_put
,
253 .cache_upcall
= expkey_upcall
,
254 .cache_parse
= expkey_parse
,
255 .cache_show
= expkey_show
,
256 .match
= expkey_match
,
258 .update
= expkey_update
,
259 .alloc
= expkey_alloc
,
263 svc_expkey_hash(struct svc_expkey
*item
)
265 int hash
= item
->ek_fsidtype
;
266 char * cp
= (char*)item
->ek_fsid
;
267 int len
= key_len(item
->ek_fsidtype
);
269 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
270 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
271 hash
&= EXPKEY_HASHMASK
;
275 static struct svc_expkey
*
276 svc_expkey_lookup(struct svc_expkey
*item
)
278 struct cache_head
*ch
;
279 int hash
= svc_expkey_hash(item
);
281 ch
= sunrpc_cache_lookup(&svc_expkey_cache
, &item
->h
,
284 return container_of(ch
, struct svc_expkey
, h
);
289 static struct svc_expkey
*
290 svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
)
292 struct cache_head
*ch
;
293 int hash
= svc_expkey_hash(new);
295 ch
= sunrpc_cache_update(&svc_expkey_cache
, &new->h
,
298 return container_of(ch
, struct svc_expkey
, h
);
304 #define EXPORT_HASHBITS 8
305 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
306 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
308 static struct cache_head
*export_table
[EXPORT_HASHMAX
];
310 static void nfsd4_fslocs_free(struct nfsd4_fs_locations
*fsloc
)
314 for (i
= 0; i
< fsloc
->locations_count
; i
++) {
315 kfree(fsloc
->locations
[i
].path
);
316 kfree(fsloc
->locations
[i
].hosts
);
318 kfree(fsloc
->locations
);
321 static void svc_export_put(struct kref
*ref
)
323 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
324 path_put(&exp
->ex_path
);
325 auth_domain_put(exp
->ex_client
);
326 kfree(exp
->ex_pathname
);
327 nfsd4_fslocs_free(&exp
->ex_fslocs
);
331 static void svc_export_request(struct cache_detail
*cd
,
332 struct cache_head
*h
,
333 char **bpp
, int *blen
)
336 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
339 qword_add(bpp
, blen
, exp
->ex_client
->name
);
340 pth
= d_path(&exp
->ex_path
, *bpp
, *blen
);
342 /* is this correct? */
346 qword_add(bpp
, blen
, pth
);
350 static int svc_export_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
352 return sunrpc_cache_pipe_upcall(cd
, h
, svc_export_request
);
355 static struct svc_export
*svc_export_update(struct svc_export
*new,
356 struct svc_export
*old
);
357 static struct svc_export
*svc_export_lookup(struct svc_export
*);
359 static int check_export(struct inode
*inode
, int *flags
, unsigned char *uuid
)
363 * We currently export only dirs, regular files, and (for v4
364 * pseudoroot) symlinks.
366 if (!S_ISDIR(inode
->i_mode
) &&
367 !S_ISLNK(inode
->i_mode
) &&
368 !S_ISREG(inode
->i_mode
))
372 * Mountd should never pass down a writeable V4ROOT export, but,
375 if (*flags
& NFSEXP_V4ROOT
)
376 *flags
|= NFSEXP_READONLY
;
378 /* There are two requirements on a filesystem to be exportable.
379 * 1: We must be able to identify the filesystem from a number.
380 * either a device number (so FS_REQUIRES_DEV needed)
381 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
382 * 2: We must be able to find an inode from a filehandle.
383 * This means that s_export_op must be set.
385 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
386 !(*flags
& NFSEXP_FSID
) &&
388 dprintk("exp_export: export of non-dev fs without fsid\n");
392 if (!inode
->i_sb
->s_export_op
||
393 !inode
->i_sb
->s_export_op
->fh_to_dentry
) {
394 dprintk("exp_export: export of invalid fs type.\n");
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 * XXX: It would be nice to also check whether this
474 * pseudoflavor is supported, so we can discover the
475 * problem at export time instead of when a client fails
478 err
= get_int(mesg
, &f
->flags
);
481 /* Only some flags are allowed to differ between flavors: */
482 if (~NFSEXP_SECINFO_FLAGS
& (f
->flags
^ exp
->ex_flags
))
485 exp
->ex_nflavors
= listsize
;
489 #else /* CONFIG_NFSD_V4 */
491 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
){return 0;}
493 secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
) { return 0; }
496 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
498 /* client path expiry [flags anonuid anongid fsid] */
502 struct auth_domain
*dom
= NULL
;
503 struct svc_export exp
= {}, *expp
;
506 if (mesg
[mlen
-1] != '\n')
510 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
516 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
521 dom
= auth_domain_find(buf
);
527 if ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
530 err
= kern_path(buf
, 0, &exp
.ex_path
);
537 exp
.ex_pathname
= kstrdup(buf
, GFP_KERNEL
);
538 if (!exp
.ex_pathname
)
543 exp
.h
.expiry_time
= get_expiry(&mesg
);
544 if (exp
.h
.expiry_time
== 0)
548 err
= get_int(&mesg
, &an_int
);
549 if (err
== -ENOENT
) {
551 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
553 if (err
|| an_int
< 0)
555 exp
.ex_flags
= an_int
;
558 err
= get_int(&mesg
, &an_int
);
561 exp
.ex_anon_uid
= an_int
;
564 err
= get_int(&mesg
, &an_int
);
567 exp
.ex_anon_gid
= an_int
;
570 err
= get_int(&mesg
, &an_int
);
573 exp
.ex_fsid
= an_int
;
575 while ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) > 0) {
576 if (strcmp(buf
, "fsloc") == 0)
577 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
578 else if (strcmp(buf
, "uuid") == 0) {
579 /* expect a 16 byte uuid encoded as \xXXXX... */
580 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
585 kmemdup(buf
, 16, GFP_KERNEL
);
586 if (exp
.ex_uuid
== NULL
)
589 } else if (strcmp(buf
, "secinfo") == 0)
590 err
= secinfo_parse(&mesg
, buf
, &exp
);
592 /* quietly ignore unknown words and anything
593 * following. Newer user-space can try to set
594 * new values, then see what the result was.
601 err
= check_export(exp
.ex_path
.dentry
->d_inode
, &exp
.ex_flags
,
607 expp
= svc_export_lookup(&exp
);
609 expp
= svc_export_update(&exp
, expp
);
618 nfsd4_fslocs_free(&exp
.ex_fslocs
);
621 kfree(exp
.ex_pathname
);
623 path_put(&exp
.ex_path
);
625 auth_domain_put(dom
);
631 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
632 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fslocs
);
633 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
);
635 static int svc_export_show(struct seq_file
*m
,
636 struct cache_detail
*cd
,
637 struct cache_head
*h
)
639 struct svc_export
*exp
;
642 seq_puts(m
, "#path domain(flags)\n");
645 exp
= container_of(h
, struct svc_export
, h
);
646 seq_path(m
, &exp
->ex_path
, " \t\n\\");
648 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
650 if (test_bit(CACHE_VALID
, &h
->flags
) &&
651 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
652 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
653 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
656 seq_puts(m
, ",uuid=");
657 for (i
=0; i
<16; i
++) {
660 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
663 show_secinfo(m
, exp
);
668 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
670 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
671 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
672 return orig
->ex_client
== new->ex_client
&&
673 orig
->ex_path
.dentry
== new->ex_path
.dentry
&&
674 orig
->ex_path
.mnt
== new->ex_path
.mnt
;
677 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
679 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
680 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
682 kref_get(&item
->ex_client
->ref
);
683 new->ex_client
= item
->ex_client
;
684 new->ex_path
.dentry
= dget(item
->ex_path
.dentry
);
685 new->ex_path
.mnt
= mntget(item
->ex_path
.mnt
);
686 new->ex_pathname
= NULL
;
687 new->ex_fslocs
.locations
= NULL
;
688 new->ex_fslocs
.locations_count
= 0;
689 new->ex_fslocs
.migrated
= 0;
692 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
694 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
695 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
698 new->ex_flags
= item
->ex_flags
;
699 new->ex_anon_uid
= item
->ex_anon_uid
;
700 new->ex_anon_gid
= item
->ex_anon_gid
;
701 new->ex_fsid
= item
->ex_fsid
;
702 new->ex_uuid
= item
->ex_uuid
;
703 item
->ex_uuid
= NULL
;
704 new->ex_pathname
= item
->ex_pathname
;
705 item
->ex_pathname
= NULL
;
706 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
707 item
->ex_fslocs
.locations
= NULL
;
708 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
709 item
->ex_fslocs
.locations_count
= 0;
710 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
711 item
->ex_fslocs
.migrated
= 0;
712 new->ex_nflavors
= item
->ex_nflavors
;
713 for (i
= 0; i
< MAX_SECINFO_LIST
; i
++) {
714 new->ex_flavors
[i
] = item
->ex_flavors
[i
];
718 static struct cache_head
*svc_export_alloc(void)
720 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
727 struct cache_detail svc_export_cache
= {
728 .owner
= THIS_MODULE
,
729 .hash_size
= EXPORT_HASHMAX
,
730 .hash_table
= export_table
,
731 .name
= "nfsd.export",
732 .cache_put
= svc_export_put
,
733 .cache_upcall
= svc_export_upcall
,
734 .cache_parse
= svc_export_parse
,
735 .cache_show
= svc_export_show
,
736 .match
= svc_export_match
,
737 .init
= svc_export_init
,
738 .update
= export_update
,
739 .alloc
= svc_export_alloc
,
743 svc_export_hash(struct svc_export
*exp
)
747 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
748 hash
^= hash_ptr(exp
->ex_path
.dentry
, EXPORT_HASHBITS
);
749 hash
^= hash_ptr(exp
->ex_path
.mnt
, EXPORT_HASHBITS
);
753 static struct svc_export
*
754 svc_export_lookup(struct svc_export
*exp
)
756 struct cache_head
*ch
;
757 int hash
= svc_export_hash(exp
);
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
;
771 int hash
= svc_export_hash(old
);
773 ch
= sunrpc_cache_update(&svc_export_cache
, &new->h
,
777 return container_of(ch
, struct svc_export
, h
);
783 static struct svc_expkey
*
784 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
786 struct svc_expkey key
, *ek
;
790 return ERR_PTR(-ENOENT
);
793 key
.ek_fsidtype
= fsid_type
;
794 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
796 ek
= svc_expkey_lookup(&key
);
798 return ERR_PTR(-ENOMEM
);
799 err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
);
805 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
806 struct svc_export
*exp
)
808 struct svc_expkey key
, *ek
;
811 key
.ek_fsidtype
= fsid_type
;
812 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
813 key
.ek_path
= exp
->ex_path
;
814 key
.h
.expiry_time
= NEVER
;
817 ek
= svc_expkey_lookup(&key
);
819 ek
= svc_expkey_update(&key
,ek
);
821 cache_put(&ek
->h
, &svc_expkey_cache
);
828 * Find the client's export entry matching xdev/xino.
830 static inline struct svc_expkey
*
831 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
835 if (old_valid_dev(dev
)) {
836 mk_fsid(FSID_DEV
, fsidv
, dev
, ino
, 0, NULL
);
837 return exp_find_key(clp
, FSID_DEV
, fsidv
, NULL
);
839 mk_fsid(FSID_ENCODE_DEV
, fsidv
, dev
, ino
, 0, NULL
);
840 return exp_find_key(clp
, FSID_ENCODE_DEV
, fsidv
, NULL
);
844 * Find the client's export entry matching fsid
846 static inline struct svc_expkey
*
847 exp_get_fsid_key(svc_client
*clp
, int fsid
)
851 mk_fsid(FSID_NUM
, fsidv
, 0, 0, fsid
, NULL
);
853 return exp_find_key(clp
, FSID_NUM
, fsidv
, NULL
);
856 static svc_export
*exp_get_by_name(svc_client
*clp
, const struct path
*path
,
857 struct cache_req
*reqp
)
859 struct svc_export
*exp
, key
;
863 return ERR_PTR(-ENOENT
);
868 exp
= svc_export_lookup(&key
);
870 return ERR_PTR(-ENOMEM
);
871 err
= cache_check(&svc_export_cache
, &exp
->h
, reqp
);
878 * Find the export entry for a given dentry.
880 static struct svc_export
*exp_parent(svc_client
*clp
, struct path
*path
)
882 struct dentry
*saved
= dget(path
->dentry
);
883 svc_export
*exp
= exp_get_by_name(clp
, path
, NULL
);
885 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
886 struct dentry
*parent
= dget_parent(path
->dentry
);
888 path
->dentry
= parent
;
889 exp
= exp_get_by_name(clp
, path
, NULL
);
892 path
->dentry
= saved
;
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)
929 static void exp_fsid_unhash(struct svc_export
*exp
)
931 struct svc_expkey
*ek
;
933 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
936 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
938 ek
->h
.expiry_time
= get_seconds()-1;
939 cache_put(&ek
->h
, &svc_expkey_cache
);
941 svc_expkey_cache
.nextcheck
= get_seconds();
944 static int exp_fsid_hash(svc_client
*clp
, struct svc_export
*exp
)
948 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
951 mk_fsid(FSID_NUM
, fsid
, 0, 0, exp
->ex_fsid
, NULL
);
952 return exp_set_key(clp
, FSID_NUM
, fsid
, exp
);
955 static int exp_hash(struct auth_domain
*clp
, struct svc_export
*exp
)
958 struct inode
*inode
= exp
->ex_path
.dentry
->d_inode
;
959 dev_t dev
= inode
->i_sb
->s_dev
;
961 if (old_valid_dev(dev
)) {
962 mk_fsid(FSID_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
963 return exp_set_key(clp
, FSID_DEV
, fsid
, exp
);
965 mk_fsid(FSID_ENCODE_DEV
, fsid
, dev
, inode
->i_ino
, 0, NULL
);
966 return exp_set_key(clp
, FSID_ENCODE_DEV
, fsid
, exp
);
969 static void exp_unhash(struct svc_export
*exp
)
971 struct svc_expkey
*ek
;
972 struct inode
*inode
= exp
->ex_path
.dentry
->d_inode
;
974 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
976 ek
->h
.expiry_time
= get_seconds()-1;
977 cache_put(&ek
->h
, &svc_expkey_cache
);
979 svc_expkey_cache
.nextcheck
= get_seconds();
983 * Export a file system.
986 exp_export(struct nfsctl_export
*nxp
)
989 struct svc_export
*exp
= NULL
;
990 struct svc_export
new;
991 struct svc_expkey
*fsid_key
= NULL
;
995 /* Consistency check */
997 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
998 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1001 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1002 nxp
->ex_client
, nxp
->ex_path
,
1003 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
1006 /* Try to lock the export table for update */
1009 /* Look up client info */
1010 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
1014 /* Look up the dentry */
1015 err
= kern_path(nxp
->ex_path
, 0, &path
);
1020 exp
= exp_get_by_name(clp
, &path
, NULL
);
1022 memset(&new, 0, sizeof(new));
1024 /* must make sure there won't be an ex_fsid clash */
1025 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
1026 (!IS_ERR(fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
))) &&
1027 fsid_key
->ek_path
.mnt
&&
1028 (fsid_key
->ek_path
.mnt
!= path
.mnt
||
1029 fsid_key
->ek_path
.dentry
!= path
.dentry
))
1033 /* just a flags/id/fsid update */
1035 exp_fsid_unhash(exp
);
1036 exp
->ex_flags
= nxp
->ex_flags
;
1037 exp
->ex_anon_uid
= nxp
->ex_anon_uid
;
1038 exp
->ex_anon_gid
= nxp
->ex_anon_gid
;
1039 exp
->ex_fsid
= nxp
->ex_dev
;
1041 err
= exp_fsid_hash(clp
, exp
);
1045 err
= check_export(path
.dentry
->d_inode
, &nxp
->ex_flags
, NULL
);
1046 if (err
) goto finish
;
1050 dprintk("nfsd: creating export entry %p for client %p\n", exp
, clp
);
1052 new.h
.expiry_time
= NEVER
;
1054 new.ex_pathname
= kstrdup(nxp
->ex_path
, GFP_KERNEL
);
1055 if (!new.ex_pathname
)
1057 new.ex_client
= clp
;
1059 new.ex_flags
= nxp
->ex_flags
;
1060 new.ex_anon_uid
= nxp
->ex_anon_uid
;
1061 new.ex_anon_gid
= nxp
->ex_anon_gid
;
1062 new.ex_fsid
= nxp
->ex_dev
;
1064 exp
= svc_export_lookup(&new);
1066 exp
= svc_export_update(&new, exp
);
1071 if (exp_hash(clp
, exp
) ||
1072 exp_fsid_hash(clp
, exp
)) {
1073 /* failed to create at least one index */
1074 exp_do_unexport(exp
);
1079 kfree(new.ex_pathname
);
1080 if (!IS_ERR_OR_NULL(exp
))
1082 if (!IS_ERR_OR_NULL(fsid_key
))
1083 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
1086 auth_domain_put(clp
);
1094 * Unexport a file system. The export entry has already
1095 * been removed from the client's list of exported fs's.
1098 exp_do_unexport(svc_export
*unexp
)
1100 unexp
->h
.expiry_time
= get_seconds()-1;
1101 svc_export_cache
.nextcheck
= get_seconds();
1103 exp_fsid_unhash(unexp
);
1111 exp_unexport(struct nfsctl_export
*nxp
)
1113 struct auth_domain
*dom
;
1118 /* Consistency check */
1119 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1120 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1126 dom
= auth_domain_find(nxp
->ex_client
);
1128 dprintk("nfsd: unexport couldn't find %s\n", nxp
->ex_client
);
1132 err
= kern_path(nxp
->ex_path
, 0, &path
);
1137 exp
= exp_get_by_name(dom
, &path
, NULL
);
1142 exp_do_unexport(exp
);
1147 auth_domain_put(dom
);
1155 * Obtain the root fh on behalf of a client.
1156 * This could be done in user space, but I feel that it adds some safety
1157 * since its harder to fool a kernel module than a user space program.
1160 exp_rootfh(svc_client
*clp
, char *name
, struct knfsd_fh
*f
, int maxsize
)
1162 struct svc_export
*exp
;
1164 struct inode
*inode
;
1169 /* NB: we probably ought to check that it's NUL-terminated */
1170 if (kern_path(name
, 0, &path
)) {
1171 printk("nfsd: exp_rootfh path not found %s", name
);
1174 inode
= path
.dentry
->d_inode
;
1176 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1177 name
, path
.dentry
, clp
->name
,
1178 inode
->i_sb
->s_id
, inode
->i_ino
);
1179 exp
= exp_parent(clp
, &path
);
1186 * fh must be initialized before calling fh_compose
1188 fh_init(&fh
, maxsize
);
1189 if (fh_compose(&fh
, exp
, path
.dentry
, NULL
))
1193 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1201 static struct svc_export
*exp_find(struct auth_domain
*clp
, int fsid_type
,
1202 u32
*fsidv
, struct cache_req
*reqp
)
1204 struct svc_export
*exp
;
1205 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
1207 return ERR_CAST(ek
);
1209 exp
= exp_get_by_name(clp
, &ek
->ek_path
, reqp
);
1210 cache_put(&ek
->h
, &svc_expkey_cache
);
1213 return ERR_CAST(exp
);
1217 __be32
check_nfsd_access(struct svc_export
*exp
, struct svc_rqst
*rqstp
)
1219 struct exp_flavor_info
*f
;
1220 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1222 /* legacy gss-only clients are always OK: */
1223 if (exp
->ex_client
== rqstp
->rq_gssclient
)
1225 /* ip-address based client; check sec= export option: */
1226 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
1227 if (f
->pseudoflavor
== rqstp
->rq_flavor
)
1230 /* defaults in absence of sec= options: */
1231 if (exp
->ex_nflavors
== 0) {
1232 if (rqstp
->rq_flavor
== RPC_AUTH_NULL
||
1233 rqstp
->rq_flavor
== RPC_AUTH_UNIX
)
1236 return nfserr_wrongsec
;
1240 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1241 * auth_unix client) if it's available and has secinfo information;
1242 * otherwise, will try to use rq_gssclient.
1244 * Called from functions that handle requests; functions that do work on
1245 * behalf of mountd are passed a single client name to use, and should
1246 * use exp_get_by_name() or exp_find().
1249 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct path
*path
)
1251 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1253 if (rqstp
->rq_client
== NULL
)
1256 /* First try the auth_unix client: */
1257 exp
= exp_get_by_name(rqstp
->rq_client
, path
, &rqstp
->rq_chandle
);
1258 if (PTR_ERR(exp
) == -ENOENT
)
1262 /* If it has secinfo, assume there are no gss/... clients */
1263 if (exp
->ex_nflavors
> 0)
1266 /* Otherwise, try falling back on gss client */
1267 if (rqstp
->rq_gssclient
== NULL
)
1269 gssexp
= exp_get_by_name(rqstp
->rq_gssclient
, path
, &rqstp
->rq_chandle
);
1270 if (PTR_ERR(gssexp
) == -ENOENT
)
1278 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1280 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1282 if (rqstp
->rq_client
== NULL
)
1285 /* First try the auth_unix client: */
1286 exp
= exp_find(rqstp
->rq_client
, fsid_type
, fsidv
, &rqstp
->rq_chandle
);
1287 if (PTR_ERR(exp
) == -ENOENT
)
1291 /* If it has secinfo, assume there are no gss/... clients */
1292 if (exp
->ex_nflavors
> 0)
1295 /* Otherwise, try falling back on gss client */
1296 if (rqstp
->rq_gssclient
== NULL
)
1298 gssexp
= exp_find(rqstp
->rq_gssclient
, fsid_type
, fsidv
,
1299 &rqstp
->rq_chandle
);
1300 if (PTR_ERR(gssexp
) == -ENOENT
)
1308 rqst_exp_parent(struct svc_rqst
*rqstp
, struct path
*path
)
1310 struct dentry
*saved
= dget(path
->dentry
);
1311 struct svc_export
*exp
= rqst_exp_get_by_name(rqstp
, path
);
1313 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
1314 struct dentry
*parent
= dget_parent(path
->dentry
);
1316 path
->dentry
= parent
;
1317 exp
= rqst_exp_get_by_name(rqstp
, path
);
1320 path
->dentry
= saved
;
1324 static struct svc_export
*find_fsidzero_export(struct svc_rqst
*rqstp
)
1328 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1330 return rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1334 * Called when we need the filehandle for the root of the pseudofs,
1335 * for a given NFSv4 client. The root is defined to be the
1336 * export point with fsid==0
1339 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1341 struct svc_export
*exp
;
1344 exp
= find_fsidzero_export(rqstp
);
1346 return nfserrno(PTR_ERR(exp
));
1347 rv
= fh_compose(fhp
, exp
, exp
->ex_path
.dentry
, NULL
);
1350 rv
= check_nfsd_access(exp
, rqstp
);
1360 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
1361 __acquires(svc_export_cache
.hash_lock
)
1364 unsigned hash
, export
;
1365 struct cache_head
*ch
;
1368 read_lock(&svc_export_cache
.hash_lock
);
1370 return SEQ_START_TOKEN
;
1372 export
= n
& ((1LL<<32) - 1);
1375 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
1378 n
&= ~((1LL<<32) - 1);
1382 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
1383 if (hash
>= EXPORT_HASHMAX
)
1386 return export_table
[hash
];
1389 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1391 struct cache_head
*ch
= p
;
1392 int hash
= (*pos
>> 32);
1394 if (p
== SEQ_START_TOKEN
)
1396 else if (ch
->next
== NULL
) {
1403 *pos
&= ~((1LL<<32) - 1);
1404 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1408 if (hash
>= EXPORT_HASHMAX
)
1411 return export_table
[hash
];
1414 static void e_stop(struct seq_file
*m
, void *p
)
1415 __releases(svc_export_cache
.hash_lock
)
1417 read_unlock(&svc_export_cache
.hash_lock
);
1421 static struct flags
{
1425 { NFSEXP_READONLY
, {"ro", "rw"}},
1426 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1427 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1428 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1429 { NFSEXP_ASYNC
, {"async", "sync"}},
1430 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1431 { NFSEXP_NOHIDE
, {"nohide", ""}},
1432 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1433 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1434 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1435 { NFSEXP_V4ROOT
, {"v4root", ""}},
1437 { NFSEXP_MSNFS
, {"msnfs", ""}},
1442 static void show_expflags(struct seq_file
*m
, int flags
, int mask
)
1445 int state
, first
= 0;
1447 for (flg
= expflags
; flg
->flag
; flg
++) {
1448 if (flg
->flag
& ~mask
)
1450 state
= (flg
->flag
& flags
) ? 0 : 1;
1451 if (*flg
->name
[state
])
1452 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1456 static void show_secinfo_flags(struct seq_file
*m
, int flags
)
1459 show_expflags(m
, flags
, NFSEXP_SECINFO_FLAGS
);
1462 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
)
1464 struct exp_flavor_info
*f
;
1465 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1466 int lastflags
= 0, first
= 0;
1468 if (exp
->ex_nflavors
== 0)
1470 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
1471 if (first
|| f
->flags
!= lastflags
) {
1473 show_secinfo_flags(m
, lastflags
);
1474 seq_printf(m
, ",sec=%d", f
->pseudoflavor
);
1475 lastflags
= f
->flags
;
1477 seq_printf(m
, ":%d", f
->pseudoflavor
);
1480 show_secinfo_flags(m
, lastflags
);
1483 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1484 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1486 show_expflags(m
, flag
, NFSEXP_ALLFLAGS
);
1487 if (flag
& NFSEXP_FSID
)
1488 seq_printf(m
, ",fsid=%d", fsid
);
1489 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1490 seq_printf(m
, ",anonuid=%u", anonu
);
1491 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1492 seq_printf(m
, ",anongid=%u", anong
);
1493 if (fsloc
&& fsloc
->locations_count
> 0) {
1494 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1497 seq_printf(m
, ",%s=", loctype
);
1498 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1500 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1501 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1503 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1505 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1510 static int e_show(struct seq_file
*m
, void *p
)
1512 struct cache_head
*cp
= p
;
1513 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1515 if (p
== SEQ_START_TOKEN
) {
1516 seq_puts(m
, "# Version 1.1\n");
1517 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1522 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1524 cache_put(&exp
->h
, &svc_export_cache
);
1525 return svc_export_show(m
, &svc_export_cache
, cp
);
1528 const struct seq_operations nfs_exports_op
= {
1536 * Add or modify a client.
1537 * Change requests may involve the list of host addresses. The list of
1538 * exports and possibly existing uid maps are left untouched.
1541 exp_addclient(struct nfsctl_client
*ncp
)
1543 struct auth_domain
*dom
;
1545 struct in6_addr addr6
;
1547 /* First, consistency check. */
1549 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1551 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1554 /* Lock the hashtable */
1557 dom
= unix_domain_find(ncp
->cl_ident
);
1563 /* Insert client into hashtable. */
1564 for (i
= 0; i
< ncp
->cl_naddr
; i
++) {
1565 ipv6_addr_set_v4mapped(ncp
->cl_addrlist
[i
].s_addr
, &addr6
);
1566 auth_unix_add_addr(&addr6
, dom
);
1568 auth_unix_forget_old(dom
);
1569 auth_domain_put(dom
);
1580 * Delete a client given an identifier.
1583 exp_delclient(struct nfsctl_client
*ncp
)
1586 struct auth_domain
*dom
;
1589 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1592 /* Lock the hashtable */
1595 dom
= auth_domain_find(ncp
->cl_ident
);
1596 /* just make sure that no addresses work
1597 * and that it will expire soon
1600 err
= auth_unix_forget_old(dom
);
1601 auth_domain_put(dom
);
1610 * Verify that string is non-empty and does not exceed max length.
1613 exp_verify_string(char *cp
, int max
)
1617 for (i
= 0; i
< max
; i
++)
1621 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1626 * Initialize the exports module.
1629 nfsd_export_init(void)
1632 dprintk("nfsd: initializing export module.\n");
1634 rv
= cache_register(&svc_export_cache
);
1637 rv
= cache_register(&svc_expkey_cache
);
1639 cache_unregister(&svc_export_cache
);
1645 * Flush exports table - called when last nfsd thread is killed
1648 nfsd_export_flush(void)
1651 cache_purge(&svc_expkey_cache
);
1652 cache_purge(&svc_export_cache
);
1657 * Shutdown the exports module.
1660 nfsd_export_shutdown(void)
1663 dprintk("nfsd: shutting down export module.\n");
1667 cache_unregister(&svc_expkey_cache
);
1668 cache_unregister(&svc_export_cache
);
1669 svcauth_unix_purge();
1672 dprintk("nfsd: export shutdown complete.\n");