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/sched.h>
20 #include <linux/stat.h>
22 #include <linux/seq_file.h>
23 #include <linux/syscalls.h>
24 #include <linux/rwsem.h>
25 #include <linux/dcache.h>
26 #include <linux/namei.h>
27 #include <linux/mount.h>
28 #include <linux/hash.h>
29 #include <linux/module.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>
37 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
39 typedef struct auth_domain svc_client
;
40 typedef struct svc_export svc_export
;
42 static void exp_do_unexport(svc_export
*unexp
);
43 static int exp_verify_string(char *cp
, int max
);
47 * One maps client+vfsmnt+dentry to export options - the export map
48 * The other maps client+filehandle-fragment to export options. - the expkey map
50 * The export options are actually stored in the first map, and the
51 * second map contains a reference to the entry in the first map.
54 #define EXPKEY_HASHBITS 8
55 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
56 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
57 static struct cache_head
*expkey_table
[EXPKEY_HASHMAX
];
59 static void expkey_put(struct kref
*ref
)
61 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
63 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
64 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
)) {
68 auth_domain_put(key
->ek_client
);
72 static void expkey_request(struct cache_detail
*cd
,
74 char **bpp
, int *blen
)
76 /* client fsidtype \xfsid */
77 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
80 qword_add(bpp
, blen
, ek
->ek_client
->name
);
81 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
82 qword_add(bpp
, blen
, type
);
83 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
87 static struct svc_expkey
*svc_expkey_update(struct svc_expkey
*new, struct svc_expkey
*old
);
88 static struct svc_expkey
*svc_expkey_lookup(struct svc_expkey
*);
89 static struct cache_detail svc_expkey_cache
;
91 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
93 /* client fsidtype fsid [path] */
96 struct auth_domain
*dom
= NULL
;
100 struct svc_expkey key
;
101 struct svc_expkey
*ek
;
103 if (mesg
[mlen
-1] != '\n')
107 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
112 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
116 dom
= auth_domain_find(buf
);
119 dprintk("found domain %s\n", buf
);
122 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
124 fsidtype
= simple_strtoul(buf
, &ep
, 10);
127 dprintk("found fsidtype %d\n", fsidtype
);
128 if (key_len(fsidtype
)==0) /* invalid type */
130 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
132 dprintk("found fsid length %d\n", len
);
133 if (len
!= key_len(fsidtype
))
136 /* OK, we seem to have a valid key */
138 key
.h
.expiry_time
= get_expiry(&mesg
);
139 if (key
.h
.expiry_time
== 0)
143 key
.ek_fsidtype
= fsidtype
;
144 memcpy(key
.ek_fsid
, buf
, len
);
146 ek
= svc_expkey_lookup(&key
);
151 /* now we want a pathname, or empty meaning NEGATIVE */
153 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) < 0)
155 dprintk("Path seems to be <%s>\n", buf
);
158 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
159 ek
= svc_expkey_update(&key
, ek
);
161 cache_put(&ek
->h
, &svc_expkey_cache
);
165 err
= path_lookup(buf
, 0, &nd
);
169 dprintk("Found the path %s\n", buf
);
171 key
.ek_dentry
= nd
.dentry
;
173 ek
= svc_expkey_update(&key
, ek
);
175 cache_put(&ek
->h
, &svc_expkey_cache
);
183 auth_domain_put(dom
);
188 static int expkey_show(struct seq_file
*m
,
189 struct cache_detail
*cd
,
190 struct cache_head
*h
)
192 struct svc_expkey
*ek
;
195 seq_puts(m
, "#domain fsidtype fsid [path]\n");
198 ek
= container_of(h
, struct svc_expkey
, h
);
199 seq_printf(m
, "%s %d 0x%08x", ek
->ek_client
->name
,
200 ek
->ek_fsidtype
, ek
->ek_fsid
[0]);
201 if (ek
->ek_fsidtype
!= 1)
202 seq_printf(m
, "%08x", ek
->ek_fsid
[1]);
203 if (ek
->ek_fsidtype
== 2)
204 seq_printf(m
, "%08x", ek
->ek_fsid
[2]);
205 if (test_bit(CACHE_VALID
, &h
->flags
) &&
206 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
208 seq_path(m
, ek
->ek_mnt
, ek
->ek_dentry
, "\\ \t\n");
214 static inline int expkey_match (struct cache_head
*a
, struct cache_head
*b
)
216 struct svc_expkey
*orig
= container_of(a
, struct svc_expkey
, h
);
217 struct svc_expkey
*new = container_of(b
, struct svc_expkey
, h
);
219 if (orig
->ek_fsidtype
!= new->ek_fsidtype
||
220 orig
->ek_client
!= new->ek_client
||
221 memcmp(orig
->ek_fsid
, new->ek_fsid
, key_len(orig
->ek_fsidtype
)) != 0)
226 static inline void expkey_init(struct cache_head
*cnew
,
227 struct cache_head
*citem
)
229 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
230 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
232 kref_get(&item
->ek_client
->ref
);
233 new->ek_client
= item
->ek_client
;
234 new->ek_fsidtype
= item
->ek_fsidtype
;
235 new->ek_fsid
[0] = item
->ek_fsid
[0];
236 new->ek_fsid
[1] = item
->ek_fsid
[1];
237 new->ek_fsid
[2] = item
->ek_fsid
[2];
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
)
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 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
)) {
385 dprintk("exp_export: export of non-dev fs without fsid\n");
388 if (!inode
->i_sb
->s_export_op
) {
389 dprintk("exp_export: export of invalid fs type.\n");
393 /* Ok, we can export it */;
394 if (!inode
->i_sb
->s_export_op
->find_exported_dentry
)
395 inode
->i_sb
->s_export_op
->find_exported_dentry
=
396 find_exported_dentry
;
401 #ifdef CONFIG_NFSD_V4
404 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
)
407 int migrated
, i
, err
;
409 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
410 if (len
!= 5 || memcmp(buf
, "fsloc", 5))
414 err
= get_int(mesg
, &fsloc
->locations_count
);
417 if (fsloc
->locations_count
> MAX_FS_LOCATIONS
)
419 if (fsloc
->locations_count
== 0)
422 fsloc
->locations
= kzalloc(fsloc
->locations_count
423 * sizeof(struct nfsd4_fs_location
), GFP_KERNEL
);
424 if (!fsloc
->locations
)
426 for (i
=0; i
< fsloc
->locations_count
; i
++) {
427 /* colon separated host list */
429 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
433 fsloc
->locations
[i
].hosts
= kstrdup(buf
, GFP_KERNEL
);
434 if (!fsloc
->locations
[i
].hosts
)
437 /* slash separated path component list */
438 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
442 fsloc
->locations
[i
].path
= kstrdup(buf
, GFP_KERNEL
);
443 if (!fsloc
->locations
[i
].path
)
447 err
= get_int(mesg
, &migrated
);
451 if (migrated
< 0 || migrated
> 1)
453 fsloc
->migrated
= migrated
;
456 nfsd4_fslocs_free(fsloc
);
460 #else /* CONFIG_NFSD_V4 */
461 static inline int fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
) { return 0; }
464 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
466 /* client path expiry [flags anonuid anongid fsid] */
470 struct auth_domain
*dom
= NULL
;
472 struct svc_export exp
, *expp
;
478 if (mesg
[mlen
-1] != '\n')
482 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
487 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
489 if (len
<= 0) goto out
;
492 dom
= auth_domain_find(buf
);
498 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
500 err
= path_lookup(buf
, 0, &nd
);
501 if (err
) goto out_no_path
;
506 exp
.ex_dentry
= nd
.dentry
;
507 exp
.ex_path
= kstrdup(buf
, GFP_KERNEL
);
514 exp
.h
.expiry_time
= get_expiry(&mesg
);
515 if (exp
.h
.expiry_time
== 0)
519 exp
.ex_fslocs
.locations
= NULL
;
520 exp
.ex_fslocs
.locations_count
= 0;
521 exp
.ex_fslocs
.migrated
= 0;
524 err
= get_int(&mesg
, &an_int
);
526 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
528 if (err
|| an_int
< 0) goto out
;
529 exp
.ex_flags
= an_int
;
532 err
= get_int(&mesg
, &an_int
);
534 exp
.ex_anon_uid
= an_int
;
537 err
= get_int(&mesg
, &an_int
);
539 exp
.ex_anon_gid
= an_int
;
542 err
= get_int(&mesg
, &an_int
);
544 exp
.ex_fsid
= an_int
;
546 err
= check_export(nd
.dentry
->d_inode
, exp
.ex_flags
);
549 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
554 expp
= svc_export_lookup(&exp
);
556 expp
= svc_export_update(&exp
, expp
);
570 auth_domain_put(dom
);
575 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
576 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fslocs
);
578 static int svc_export_show(struct seq_file
*m
,
579 struct cache_detail
*cd
,
580 struct cache_head
*h
)
582 struct svc_export
*exp
;
585 seq_puts(m
, "#path domain(flags)\n");
588 exp
= container_of(h
, struct svc_export
, h
);
589 seq_path(m
, exp
->ex_mnt
, exp
->ex_dentry
, " \t\n\\");
591 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
593 if (test_bit(CACHE_VALID
, &h
->flags
) &&
594 !test_bit(CACHE_NEGATIVE
, &h
->flags
))
595 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
596 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
600 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
602 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
603 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
604 return orig
->ex_client
== new->ex_client
&&
605 orig
->ex_dentry
== new->ex_dentry
&&
606 orig
->ex_mnt
== new->ex_mnt
;
609 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
611 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
612 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
614 kref_get(&item
->ex_client
->ref
);
615 new->ex_client
= item
->ex_client
;
616 new->ex_dentry
= dget(item
->ex_dentry
);
617 new->ex_mnt
= mntget(item
->ex_mnt
);
619 new->ex_fslocs
.locations
= NULL
;
620 new->ex_fslocs
.locations_count
= 0;
621 new->ex_fslocs
.migrated
= 0;
624 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
626 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
627 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
629 new->ex_flags
= item
->ex_flags
;
630 new->ex_anon_uid
= item
->ex_anon_uid
;
631 new->ex_anon_gid
= item
->ex_anon_gid
;
632 new->ex_fsid
= item
->ex_fsid
;
633 new->ex_path
= item
->ex_path
;
634 item
->ex_path
= NULL
;
635 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
636 item
->ex_fslocs
.locations
= NULL
;
637 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
638 item
->ex_fslocs
.locations_count
= 0;
639 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
640 item
->ex_fslocs
.migrated
= 0;
643 static struct cache_head
*svc_export_alloc(void)
645 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
652 struct cache_detail svc_export_cache
= {
653 .owner
= THIS_MODULE
,
654 .hash_size
= EXPORT_HASHMAX
,
655 .hash_table
= export_table
,
656 .name
= "nfsd.export",
657 .cache_put
= svc_export_put
,
658 .cache_request
= svc_export_request
,
659 .cache_parse
= svc_export_parse
,
660 .cache_show
= svc_export_show
,
661 .match
= svc_export_match
,
662 .init
= svc_export_init
,
663 .update
= export_update
,
664 .alloc
= svc_export_alloc
,
667 static struct svc_export
*
668 svc_export_lookup(struct svc_export
*exp
)
670 struct cache_head
*ch
;
672 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
673 hash
^= hash_ptr(exp
->ex_dentry
, EXPORT_HASHBITS
);
674 hash
^= hash_ptr(exp
->ex_mnt
, EXPORT_HASHBITS
);
676 ch
= sunrpc_cache_lookup(&svc_export_cache
, &exp
->h
,
679 return container_of(ch
, struct svc_export
, h
);
684 static struct svc_export
*
685 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
687 struct cache_head
*ch
;
689 hash
= hash_ptr(old
->ex_client
, EXPORT_HASHBITS
);
690 hash
^= hash_ptr(old
->ex_dentry
, EXPORT_HASHBITS
);
691 hash
^= hash_ptr(old
->ex_mnt
, EXPORT_HASHBITS
);
693 ch
= sunrpc_cache_update(&svc_export_cache
, &new->h
,
697 return container_of(ch
, struct svc_export
, h
);
703 static struct svc_expkey
*
704 exp_find_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
, struct cache_req
*reqp
)
706 struct svc_expkey key
, *ek
;
713 key
.ek_fsidtype
= fsid_type
;
714 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
716 ek
= svc_expkey_lookup(&key
);
718 if ((err
= cache_check(&svc_expkey_cache
, &ek
->h
, reqp
)))
723 static int exp_set_key(svc_client
*clp
, int fsid_type
, u32
*fsidv
,
724 struct svc_export
*exp
)
726 struct svc_expkey key
, *ek
;
729 key
.ek_fsidtype
= fsid_type
;
730 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
731 key
.ek_mnt
= exp
->ex_mnt
;
732 key
.ek_dentry
= exp
->ex_dentry
;
733 key
.h
.expiry_time
= NEVER
;
736 ek
= svc_expkey_lookup(&key
);
738 ek
= svc_expkey_update(&key
,ek
);
740 cache_put(&ek
->h
, &svc_expkey_cache
);
747 * Find the client's export entry matching xdev/xino.
749 static inline struct svc_expkey
*
750 exp_get_key(svc_client
*clp
, dev_t dev
, ino_t ino
)
754 if (old_valid_dev(dev
)) {
755 mk_fsid_v0(fsidv
, dev
, ino
);
756 return exp_find_key(clp
, 0, fsidv
, NULL
);
758 mk_fsid_v3(fsidv
, dev
, ino
);
759 return exp_find_key(clp
, 3, fsidv
, NULL
);
763 * Find the client's export entry matching fsid
765 static inline struct svc_expkey
*
766 exp_get_fsid_key(svc_client
*clp
, int fsid
)
770 mk_fsid_v1(fsidv
, fsid
);
772 return exp_find_key(clp
, 1, fsidv
, NULL
);
776 exp_get_by_name(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
777 struct cache_req
*reqp
)
779 struct svc_export
*exp
, key
;
786 key
.ex_dentry
= dentry
;
788 exp
= svc_export_lookup(&key
);
792 err
= cache_check(&svc_export_cache
, &exp
->h
, reqp
);
808 * Find the export entry for a given dentry.
811 exp_parent(svc_client
*clp
, struct vfsmount
*mnt
, struct dentry
*dentry
,
812 struct cache_req
*reqp
)
817 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
819 while (exp
== NULL
&& !IS_ROOT(dentry
)) {
820 struct dentry
*parent
;
822 parent
= dget_parent(dentry
);
825 exp
= exp_get_by_name(clp
, mnt
, dentry
, reqp
);
832 * Hashtable locking. Write locks are placed only by user processes
833 * wanting to modify export information.
834 * Write locking only done in this file. Read locking
838 static DECLARE_RWSEM(hash_sem
);
843 down_read(&hash_sem
);
849 down_write(&hash_sem
);
859 exp_writeunlock(void)
864 static void exp_fsid_unhash(struct svc_export
*exp
)
866 struct svc_expkey
*ek
;
868 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
871 ek
= exp_get_fsid_key(exp
->ex_client
, exp
->ex_fsid
);
872 if (ek
&& !IS_ERR(ek
)) {
873 ek
->h
.expiry_time
= get_seconds()-1;
874 cache_put(&ek
->h
, &svc_expkey_cache
);
876 svc_expkey_cache
.nextcheck
= get_seconds();
879 static int exp_fsid_hash(svc_client
*clp
, struct svc_export
*exp
)
883 if ((exp
->ex_flags
& NFSEXP_FSID
) == 0)
886 mk_fsid_v1(fsid
, exp
->ex_fsid
);
887 return exp_set_key(clp
, 1, fsid
, exp
);
890 static int exp_hash(struct auth_domain
*clp
, struct svc_export
*exp
)
893 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
894 dev_t dev
= inode
->i_sb
->s_dev
;
896 if (old_valid_dev(dev
)) {
897 mk_fsid_v0(fsid
, dev
, inode
->i_ino
);
898 return exp_set_key(clp
, 0, fsid
, exp
);
900 mk_fsid_v3(fsid
, dev
, inode
->i_ino
);
901 return exp_set_key(clp
, 3, fsid
, exp
);
904 static void exp_unhash(struct svc_export
*exp
)
906 struct svc_expkey
*ek
;
907 struct inode
*inode
= exp
->ex_dentry
->d_inode
;
909 ek
= exp_get_key(exp
->ex_client
, inode
->i_sb
->s_dev
, inode
->i_ino
);
910 if (ek
&& !IS_ERR(ek
)) {
911 ek
->h
.expiry_time
= get_seconds()-1;
912 cache_put(&ek
->h
, &svc_expkey_cache
);
914 svc_expkey_cache
.nextcheck
= get_seconds();
918 * Export a file system.
921 exp_export(struct nfsctl_export
*nxp
)
924 struct svc_export
*exp
= NULL
;
925 struct svc_export
new;
926 struct svc_expkey
*fsid_key
= NULL
;
930 /* Consistency check */
932 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
933 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
936 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
937 nxp
->ex_client
, nxp
->ex_path
,
938 (unsigned)nxp
->ex_dev
, (long)nxp
->ex_ino
,
941 /* Try to lock the export table for update */
944 /* Look up client info */
945 if (!(clp
= auth_domain_find(nxp
->ex_client
)))
949 /* Look up the dentry */
950 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
955 exp
= exp_get_by_name(clp
, nd
.mnt
, nd
.dentry
, NULL
);
957 memset(&new, 0, sizeof(new));
959 /* must make sure there won't be an ex_fsid clash */
960 if ((nxp
->ex_flags
& NFSEXP_FSID
) &&
961 (fsid_key
= exp_get_fsid_key(clp
, nxp
->ex_dev
)) &&
964 (fsid_key
->ek_mnt
!= nd
.mnt
|| fsid_key
->ek_dentry
!= nd
.dentry
) )
968 /* just a flags/id/fsid update */
970 exp_fsid_unhash(exp
);
971 exp
->ex_flags
= nxp
->ex_flags
;
972 exp
->ex_anon_uid
= nxp
->ex_anon_uid
;
973 exp
->ex_anon_gid
= nxp
->ex_anon_gid
;
974 exp
->ex_fsid
= nxp
->ex_dev
;
976 err
= exp_fsid_hash(clp
, exp
);
980 err
= check_export(nd
.dentry
->d_inode
, nxp
->ex_flags
);
981 if (err
) goto finish
;
985 dprintk("nfsd: creating export entry %p for client %p\n", exp
, clp
);
987 new.h
.expiry_time
= NEVER
;
989 new.ex_path
= kstrdup(nxp
->ex_path
, GFP_KERNEL
);
994 new.ex_dentry
= nd
.dentry
;
995 new.ex_flags
= nxp
->ex_flags
;
996 new.ex_anon_uid
= nxp
->ex_anon_uid
;
997 new.ex_anon_gid
= nxp
->ex_anon_gid
;
998 new.ex_fsid
= nxp
->ex_dev
;
1000 exp
= svc_export_lookup(&new);
1002 exp
= svc_export_update(&new, exp
);
1007 if (exp_hash(clp
, exp
) ||
1008 exp_fsid_hash(clp
, exp
)) {
1009 /* failed to create at least one index */
1010 exp_do_unexport(exp
);
1019 if (fsid_key
&& !IS_ERR(fsid_key
))
1020 cache_put(&fsid_key
->h
, &svc_expkey_cache
);
1022 auth_domain_put(clp
);
1031 * Unexport a file system. The export entry has already
1032 * been removed from the client's list of exported fs's.
1035 exp_do_unexport(svc_export
*unexp
)
1037 unexp
->h
.expiry_time
= get_seconds()-1;
1038 svc_export_cache
.nextcheck
= get_seconds();
1040 exp_fsid_unhash(unexp
);
1048 exp_unexport(struct nfsctl_export
*nxp
)
1050 struct auth_domain
*dom
;
1052 struct nameidata nd
;
1055 /* Consistency check */
1056 if (!exp_verify_string(nxp
->ex_path
, NFS_MAXPATHLEN
) ||
1057 !exp_verify_string(nxp
->ex_client
, NFSCLNT_IDMAX
))
1063 dom
= auth_domain_find(nxp
->ex_client
);
1065 dprintk("nfsd: unexport couldn't find %s\n", nxp
->ex_client
);
1069 err
= path_lookup(nxp
->ex_path
, 0, &nd
);
1074 exp
= exp_get_by_name(dom
, nd
.mnt
, nd
.dentry
, NULL
);
1079 exp_do_unexport(exp
);
1084 auth_domain_put(dom
);
1092 * Obtain the root fh on behalf of a client.
1093 * This could be done in user space, but I feel that it adds some safety
1094 * since its harder to fool a kernel module than a user space program.
1097 exp_rootfh(svc_client
*clp
, char *path
, struct knfsd_fh
*f
, int maxsize
)
1099 struct svc_export
*exp
;
1100 struct nameidata nd
;
1101 struct inode
*inode
;
1106 /* NB: we probably ought to check that it's NUL-terminated */
1107 if (path_lookup(path
, 0, &nd
)) {
1108 printk("nfsd: exp_rootfh path not found %s", path
);
1111 inode
= nd
.dentry
->d_inode
;
1113 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1114 path
, nd
.dentry
, clp
->name
,
1115 inode
->i_sb
->s_id
, inode
->i_ino
);
1116 exp
= exp_parent(clp
, nd
.mnt
, nd
.dentry
, NULL
);
1122 dprintk("nfsd: exp_rootfh export not found.\n");
1127 * fh must be initialized before calling fh_compose
1129 fh_init(&fh
, maxsize
);
1130 if (fh_compose(&fh
, exp
, nd
.dentry
, NULL
))
1134 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1143 exp_find(struct auth_domain
*clp
, int fsid_type
, u32
*fsidv
,
1144 struct cache_req
*reqp
)
1146 struct svc_export
*exp
;
1147 struct svc_expkey
*ek
= exp_find_key(clp
, fsid_type
, fsidv
, reqp
);
1148 if (!ek
|| IS_ERR(ek
))
1149 return ERR_PTR(PTR_ERR(ek
));
1151 exp
= exp_get_by_name(clp
, ek
->ek_mnt
, ek
->ek_dentry
, reqp
);
1152 cache_put(&ek
->h
, &svc_expkey_cache
);
1154 if (!exp
|| IS_ERR(exp
))
1155 return ERR_PTR(PTR_ERR(exp
));
1161 * Called when we need the filehandle for the root of the pseudofs,
1162 * for a given NFSv4 client. The root is defined to be the
1163 * export point with fsid==0
1166 exp_pseudoroot(struct auth_domain
*clp
, struct svc_fh
*fhp
,
1167 struct cache_req
*creq
)
1169 struct svc_export
*exp
;
1173 mk_fsid_v1(fsidv
, 0);
1175 exp
= exp_find(clp
, 1, fsidv
, creq
);
1177 return nfserrno(PTR_ERR(exp
));
1180 rv
= fh_compose(fhp
, exp
, exp
->ex_dentry
, NULL
);
1187 static void *e_start(struct seq_file
*m
, loff_t
*pos
)
1188 __acquires(svc_export_cache
.hash_lock
)
1191 unsigned hash
, export
;
1192 struct cache_head
*ch
;
1195 read_lock(&svc_export_cache
.hash_lock
);
1197 return SEQ_START_TOKEN
;
1199 export
= n
& ((1LL<<32) - 1);
1202 for (ch
=export_table
[hash
]; ch
; ch
=ch
->next
)
1205 n
&= ~((1LL<<32) - 1);
1209 } while(hash
< EXPORT_HASHMAX
&& export_table
[hash
]==NULL
);
1210 if (hash
>= EXPORT_HASHMAX
)
1213 return export_table
[hash
];
1216 static void *e_next(struct seq_file
*m
, void *p
, loff_t
*pos
)
1218 struct cache_head
*ch
= p
;
1219 int hash
= (*pos
>> 32);
1221 if (p
== SEQ_START_TOKEN
)
1223 else if (ch
->next
== NULL
) {
1230 *pos
&= ~((1LL<<32) - 1);
1231 while (hash
< EXPORT_HASHMAX
&& export_table
[hash
] == NULL
) {
1235 if (hash
>= EXPORT_HASHMAX
)
1238 return export_table
[hash
];
1241 static void e_stop(struct seq_file
*m
, void *p
)
1242 __releases(svc_export_cache
.hash_lock
)
1244 read_unlock(&svc_export_cache
.hash_lock
);
1248 static struct flags
{
1252 { NFSEXP_READONLY
, {"ro", "rw"}},
1253 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1254 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1255 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1256 { NFSEXP_ASYNC
, {"async", "sync"}},
1257 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1258 { NFSEXP_NOHIDE
, {"nohide", ""}},
1259 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1260 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1261 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1263 { NFSEXP_MSNFS
, {"msnfs", ""}},
1268 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1269 uid_t anonu
, uid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1274 for (flg
= expflags
; flg
->flag
; flg
++) {
1275 int state
= (flg
->flag
& flag
)?0:1;
1276 if (*flg
->name
[state
])
1277 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1279 if (flag
& NFSEXP_FSID
)
1280 seq_printf(m
, "%sfsid=%d", first
++?",":"", fsid
);
1281 if (anonu
!= (uid_t
)-2 && anonu
!= (0x10000-2))
1282 seq_printf(m
, "%sanonuid=%d", first
++?",":"", anonu
);
1283 if (anong
!= (gid_t
)-2 && anong
!= (0x10000-2))
1284 seq_printf(m
, "%sanongid=%d", first
++?",":"", anong
);
1285 if (fsloc
&& fsloc
->locations_count
> 0) {
1286 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1289 seq_printf(m
, "%s%s=", first
++?",":"", loctype
);
1290 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1292 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1293 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1295 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1297 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1302 static int e_show(struct seq_file
*m
, void *p
)
1304 struct cache_head
*cp
= p
;
1305 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1307 if (p
== SEQ_START_TOKEN
) {
1308 seq_puts(m
, "# Version 1.1\n");
1309 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1314 if (cache_check(&svc_export_cache
, &exp
->h
, NULL
))
1316 cache_put(&exp
->h
, &svc_export_cache
);
1317 return svc_export_show(m
, &svc_export_cache
, cp
);
1320 struct seq_operations nfs_exports_op
= {
1328 * Add or modify a client.
1329 * Change requests may involve the list of host addresses. The list of
1330 * exports and possibly existing uid maps are left untouched.
1333 exp_addclient(struct nfsctl_client
*ncp
)
1335 struct auth_domain
*dom
;
1338 /* First, consistency check. */
1340 if (! exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1342 if (ncp
->cl_naddr
> NFSCLNT_ADDRMAX
)
1345 /* Lock the hashtable */
1348 dom
= unix_domain_find(ncp
->cl_ident
);
1354 /* Insert client into hashtable. */
1355 for (i
= 0; i
< ncp
->cl_naddr
; i
++)
1356 auth_unix_add_addr(ncp
->cl_addrlist
[i
], dom
);
1358 auth_unix_forget_old(dom
);
1359 auth_domain_put(dom
);
1370 * Delete a client given an identifier.
1373 exp_delclient(struct nfsctl_client
*ncp
)
1376 struct auth_domain
*dom
;
1379 if (!exp_verify_string(ncp
->cl_ident
, NFSCLNT_IDMAX
))
1382 /* Lock the hashtable */
1385 dom
= auth_domain_find(ncp
->cl_ident
);
1386 /* just make sure that no addresses work
1387 * and that it will expire soon
1390 err
= auth_unix_forget_old(dom
);
1391 auth_domain_put(dom
);
1400 * Verify that string is non-empty and does not exceed max length.
1403 exp_verify_string(char *cp
, int max
)
1407 for (i
= 0; i
< max
; i
++)
1411 printk(KERN_NOTICE
"nfsd: couldn't validate string %s\n", cp
);
1416 * Initialize the exports module.
1419 nfsd_export_init(void)
1421 dprintk("nfsd: initializing export module.\n");
1423 cache_register(&svc_export_cache
);
1424 cache_register(&svc_expkey_cache
);
1429 * Flush exports table - called when last nfsd thread is killed
1432 nfsd_export_flush(void)
1435 cache_purge(&svc_expkey_cache
);
1436 cache_purge(&svc_export_cache
);
1441 * Shutdown the exports module.
1444 nfsd_export_shutdown(void)
1447 dprintk("nfsd: shutting down export module.\n");
1451 if (cache_unregister(&svc_expkey_cache
))
1452 printk(KERN_ERR
"nfsd: failed to unregister expkey cache\n");
1453 if (cache_unregister(&svc_export_cache
))
1454 printk(KERN_ERR
"nfsd: failed to unregister export cache\n");
1455 svcauth_unix_purge();
1458 dprintk("nfsd: export shutdown complete.\n");