2 * Common NFSv4 ACL handling code.
4 * Copyright (c) 2002, 2003 The Regents of the University of Michigan.
7 * Marius Aamodt Eriksen <marius@umich.edu>
8 * Jeff Sedlak <jsedlak@umich.edu>
9 * J. Bruce Fields <bfields@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 #include <linux/slab.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/export.h>
45 #define NFS4_ACL_TYPE_DEFAULT 0x01
46 #define NFS4_ACL_DIR 0x02
47 #define NFS4_ACL_OWNER 0x04
49 /* mode bit translations: */
50 #define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
51 #define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
52 #define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
53 #define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
54 #define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
56 /* We don't support these bits; insist they be neither allowed nor denied */
57 #define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \
58 | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS)
60 /* flags used to simulate posix default ACLs */
61 #define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
62 | NFS4_ACE_DIRECTORY_INHERIT_ACE)
64 #define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
65 | NFS4_ACE_INHERIT_ONLY_ACE \
66 | NFS4_ACE_IDENTIFIER_GROUP)
68 #define MASK_EQUAL(mask1, mask2) \
69 ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
72 mask_from_posix(unsigned short perm
, unsigned int flags
)
74 int mask
= NFS4_ANYONE_MODE
;
76 if (flags
& NFS4_ACL_OWNER
)
77 mask
|= NFS4_OWNER_MODE
;
79 mask
|= NFS4_READ_MODE
;
81 mask
|= NFS4_WRITE_MODE
;
82 if ((perm
& ACL_WRITE
) && (flags
& NFS4_ACL_DIR
))
83 mask
|= NFS4_ACE_DELETE_CHILD
;
84 if (perm
& ACL_EXECUTE
)
85 mask
|= NFS4_EXECUTE_MODE
;
90 deny_mask_from_posix(unsigned short perm
, u32 flags
)
95 mask
|= NFS4_READ_MODE
;
97 mask
|= NFS4_WRITE_MODE
;
98 if ((perm
& ACL_WRITE
) && (flags
& NFS4_ACL_DIR
))
99 mask
|= NFS4_ACE_DELETE_CHILD
;
100 if (perm
& ACL_EXECUTE
)
101 mask
|= NFS4_EXECUTE_MODE
;
105 /* XXX: modify functions to return NFS errors; they're only ever
106 * used by nfs code, after all.... */
108 /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
109 * side of being more restrictive, so the mode bit mapping below is
110 * pessimistic. An optimistic version would be needed to handle DENY's,
111 * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
115 low_mode_from_nfs4(u32 perm
, unsigned short *mode
, unsigned int flags
)
117 u32 write_mode
= NFS4_WRITE_MODE
;
119 if (flags
& NFS4_ACL_DIR
)
120 write_mode
|= NFS4_ACE_DELETE_CHILD
;
122 if ((perm
& NFS4_READ_MODE
) == NFS4_READ_MODE
)
124 if ((perm
& write_mode
) == write_mode
)
126 if ((perm
& NFS4_EXECUTE_MODE
) == NFS4_EXECUTE_MODE
)
127 *mode
|= ACL_EXECUTE
;
130 struct ace_container
{
131 struct nfs4_ace
*ace
;
132 struct list_head ace_l
;
135 static short ace2type(struct nfs4_ace
*);
136 static void _posix_to_nfsv4_one(struct posix_acl
*, struct nfs4_acl
*,
140 nfsd4_get_nfs4_acl(struct svc_rqst
*rqstp
, struct dentry
*dentry
,
141 struct nfs4_acl
**acl
)
143 struct inode
*inode
= dentry
->d_inode
;
145 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
146 unsigned int flags
= 0;
149 pacl
= get_acl(inode
, ACL_TYPE_ACCESS
);
151 pacl
= posix_acl_from_mode(inode
->i_mode
, GFP_KERNEL
);
153 return PTR_ERR(pacl
);
155 /* allocate for worst case: one (deny, allow) pair each: */
156 size
+= 2 * pacl
->a_count
;
158 if (S_ISDIR(inode
->i_mode
)) {
159 flags
= NFS4_ACL_DIR
;
160 dpacl
= get_acl(inode
, ACL_TYPE_DEFAULT
);
162 size
+= 2 * dpacl
->a_count
;
165 *acl
= nfs4_acl_new(size
);
171 _posix_to_nfsv4_one(pacl
, *acl
, flags
& ~NFS4_ACL_TYPE_DEFAULT
);
174 _posix_to_nfsv4_one(dpacl
, *acl
, flags
| NFS4_ACL_TYPE_DEFAULT
);
177 posix_acl_release(pacl
);
178 posix_acl_release(dpacl
);
182 struct posix_acl_summary
{
183 unsigned short owner
;
184 unsigned short users
;
185 unsigned short group
;
186 unsigned short groups
;
187 unsigned short other
;
192 summarize_posix_acl(struct posix_acl
*acl
, struct posix_acl_summary
*pas
)
194 struct posix_acl_entry
*pa
, *pe
;
197 * Only pas.users and pas.groups need initialization; previous
198 * posix_acl_valid() calls ensure that the other fields will be
199 * initialized in the following loop. But, just to placate gcc:
201 memset(pas
, 0, sizeof(*pas
));
204 pe
= acl
->a_entries
+ acl
->a_count
;
206 FOREACH_ACL_ENTRY(pa
, acl
, pe
) {
209 pas
->owner
= pa
->e_perm
;
212 pas
->group
= pa
->e_perm
;
215 pas
->users
|= pa
->e_perm
;
218 pas
->groups
|= pa
->e_perm
;
221 pas
->other
= pa
->e_perm
;
224 pas
->mask
= pa
->e_perm
;
228 /* We'll only care about effective permissions: */
229 pas
->users
&= pas
->mask
;
230 pas
->group
&= pas
->mask
;
231 pas
->groups
&= pas
->mask
;
234 /* We assume the acl has been verified with posix_acl_valid. */
236 _posix_to_nfsv4_one(struct posix_acl
*pacl
, struct nfs4_acl
*acl
,
239 struct posix_acl_entry
*pa
, *group_owner_entry
;
240 struct nfs4_ace
*ace
;
241 struct posix_acl_summary pas
;
243 int eflag
= ((flags
& NFS4_ACL_TYPE_DEFAULT
) ?
244 NFS4_INHERITANCE_FLAGS
| NFS4_ACE_INHERIT_ONLY_ACE
: 0);
246 BUG_ON(pacl
->a_count
< 3);
247 summarize_posix_acl(pacl
, &pas
);
249 pa
= pacl
->a_entries
;
250 ace
= acl
->aces
+ acl
->naces
;
252 /* We could deny everything not granted by the owner: */
255 * but it is equivalent (and simpler) to deny only what is not
256 * granted by later entries:
258 deny
&= pas
.users
| pas
.group
| pas
.groups
| pas
.other
;
260 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
262 ace
->access_mask
= deny_mask_from_posix(deny
, flags
);
263 ace
->whotype
= NFS4_ACL_WHO_OWNER
;
268 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
270 ace
->access_mask
= mask_from_posix(pa
->e_perm
, flags
| NFS4_ACL_OWNER
);
271 ace
->whotype
= NFS4_ACL_WHO_OWNER
;
276 while (pa
->e_tag
== ACL_USER
) {
277 deny
= ~(pa
->e_perm
& pas
.mask
);
278 deny
&= pas
.groups
| pas
.group
| pas
.other
;
280 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
282 ace
->access_mask
= deny_mask_from_posix(deny
, flags
);
283 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
284 ace
->who_uid
= pa
->e_uid
;
288 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
290 ace
->access_mask
= mask_from_posix(pa
->e_perm
& pas
.mask
,
292 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
293 ace
->who_uid
= pa
->e_uid
;
299 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
300 * since a user can be in more than one group. */
304 group_owner_entry
= pa
;
306 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
308 ace
->access_mask
= mask_from_posix(pas
.group
, flags
);
309 ace
->whotype
= NFS4_ACL_WHO_GROUP
;
314 while (pa
->e_tag
== ACL_GROUP
) {
315 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
316 ace
->flag
= eflag
| NFS4_ACE_IDENTIFIER_GROUP
;
317 ace
->access_mask
= mask_from_posix(pa
->e_perm
& pas
.mask
,
319 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
320 ace
->who_gid
= pa
->e_gid
;
328 pa
= group_owner_entry
;
330 deny
= ~pas
.group
& pas
.other
;
332 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
334 ace
->access_mask
= deny_mask_from_posix(deny
, flags
);
335 ace
->whotype
= NFS4_ACL_WHO_GROUP
;
341 while (pa
->e_tag
== ACL_GROUP
) {
342 deny
= ~(pa
->e_perm
& pas
.mask
);
345 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
346 ace
->flag
= eflag
| NFS4_ACE_IDENTIFIER_GROUP
;
347 ace
->access_mask
= deny_mask_from_posix(deny
, flags
);
348 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
349 ace
->who_gid
= pa
->e_gid
;
356 if (pa
->e_tag
== ACL_MASK
)
358 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
360 ace
->access_mask
= mask_from_posix(pa
->e_perm
, flags
);
361 ace
->whotype
= NFS4_ACL_WHO_EVERYONE
;
366 pace_gt(struct posix_acl_entry
*pace1
, struct posix_acl_entry
*pace2
)
368 if (pace1
->e_tag
!= pace2
->e_tag
)
369 return pace1
->e_tag
> pace2
->e_tag
;
370 if (pace1
->e_tag
== ACL_USER
)
371 return uid_gt(pace1
->e_uid
, pace2
->e_uid
);
372 if (pace1
->e_tag
== ACL_GROUP
)
373 return gid_gt(pace1
->e_gid
, pace2
->e_gid
);
378 sort_pacl_range(struct posix_acl
*pacl
, int start
, int end
) {
380 struct posix_acl_entry tmp
;
382 /* We just do a bubble sort; easy to do in place, and we're not
383 * expecting acl's to be long enough to justify anything more. */
386 for (i
= start
; i
< end
; i
++) {
387 if (pace_gt(&pacl
->a_entries
[i
],
388 &pacl
->a_entries
[i
+1])) {
390 tmp
= pacl
->a_entries
[i
];
391 pacl
->a_entries
[i
] = pacl
->a_entries
[i
+1];
392 pacl
->a_entries
[i
+1] = tmp
;
399 sort_pacl(struct posix_acl
*pacl
)
401 /* posix_acl_valid requires that users and groups be in order
405 if (pacl
->a_count
<= 4)
406 return; /* no users or groups */
408 while (pacl
->a_entries
[i
].e_tag
== ACL_USER
)
410 sort_pacl_range(pacl
, 1, i
-1);
412 BUG_ON(pacl
->a_entries
[i
].e_tag
!= ACL_GROUP_OBJ
);
414 while (pacl
->a_entries
[j
].e_tag
== ACL_GROUP
)
416 sort_pacl_range(pacl
, i
, j
-1);
421 * While processing the NFSv4 ACE, this maintains bitmasks representing
422 * which permission bits have been allowed and which denied to a given
424 struct posix_ace_state
{
429 struct posix_user_ace_state
{
434 struct posix_ace_state perms
;
437 struct posix_ace_state_array
{
439 struct posix_user_ace_state aces
[];
443 * While processing the NFSv4 ACE, this maintains the partial permissions
444 * calculated so far: */
446 struct posix_acl_state
{
448 struct posix_ace_state owner
;
449 struct posix_ace_state group
;
450 struct posix_ace_state other
;
451 struct posix_ace_state everyone
;
452 struct posix_ace_state mask
; /* Deny unused in this case */
453 struct posix_ace_state_array
*users
;
454 struct posix_ace_state_array
*groups
;
458 init_state(struct posix_acl_state
*state
, int cnt
)
462 memset(state
, 0, sizeof(struct posix_acl_state
));
465 * In the worst case, each individual acl could be for a distinct
466 * named user or group, but we don't no which, so we allocate
467 * enough space for either:
469 alloc
= sizeof(struct posix_ace_state_array
)
470 + cnt
*sizeof(struct posix_user_ace_state
);
471 state
->users
= kzalloc(alloc
, GFP_KERNEL
);
474 state
->groups
= kzalloc(alloc
, GFP_KERNEL
);
475 if (!state
->groups
) {
483 free_state(struct posix_acl_state
*state
) {
485 kfree(state
->groups
);
488 static inline void add_to_mask(struct posix_acl_state
*state
, struct posix_ace_state
*astate
)
490 state
->mask
.allow
|= astate
->allow
;
494 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
495 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
496 * to traditional read/write/execute permissions.
498 * It's problematic to reject acls that use certain mode bits, because it
499 * places the burden on users to learn the rules about which bits one
500 * particular server sets, without giving the user a lot of help--we return an
501 * error that could mean any number of different things. To make matters
502 * worse, the problematic bits might be introduced by some application that's
503 * automatically mapping from some other acl model.
505 * So wherever possible we accept anything, possibly erring on the side of
506 * denying more permissions than necessary.
508 * However we do reject *explicit* DENY's of a few bits representing
509 * permissions we could never deny:
512 static inline int check_deny(u32 mask
, int isowner
)
514 if (mask
& (NFS4_ACE_READ_ATTRIBUTES
| NFS4_ACE_READ_ACL
))
518 if (mask
& (NFS4_ACE_WRITE_ATTRIBUTES
| NFS4_ACE_WRITE_ACL
))
523 static struct posix_acl
*
524 posix_state_to_acl(struct posix_acl_state
*state
, unsigned int flags
)
526 struct posix_acl_entry
*pace
;
527 struct posix_acl
*pacl
;
532 * ACLs with no ACEs are treated differently in the inheritable
533 * and effective cases: when there are no inheritable ACEs, we
534 * set a zero-length default posix acl:
536 if (state
->empty
&& (flags
& NFS4_ACL_TYPE_DEFAULT
)) {
537 pacl
= posix_acl_alloc(0, GFP_KERNEL
);
538 return pacl
? pacl
: ERR_PTR(-ENOMEM
);
541 * When there are no effective ACEs, the following will end
542 * up setting a 3-element effective posix ACL with all
545 if (!state
->users
->n
&& !state
->groups
->n
)
547 else /* Note we also include a MASK ACE in this case: */
548 nace
= 4 + state
->users
->n
+ state
->groups
->n
;
549 pacl
= posix_acl_alloc(nace
, GFP_KERNEL
);
551 return ERR_PTR(-ENOMEM
);
553 pace
= pacl
->a_entries
;
554 pace
->e_tag
= ACL_USER_OBJ
;
555 error
= check_deny(state
->owner
.deny
, 1);
558 low_mode_from_nfs4(state
->owner
.allow
, &pace
->e_perm
, flags
);
560 for (i
=0; i
< state
->users
->n
; i
++) {
562 pace
->e_tag
= ACL_USER
;
563 error
= check_deny(state
->users
->aces
[i
].perms
.deny
, 0);
566 low_mode_from_nfs4(state
->users
->aces
[i
].perms
.allow
,
567 &pace
->e_perm
, flags
);
568 pace
->e_uid
= state
->users
->aces
[i
].uid
;
569 add_to_mask(state
, &state
->users
->aces
[i
].perms
);
573 pace
->e_tag
= ACL_GROUP_OBJ
;
574 error
= check_deny(state
->group
.deny
, 0);
577 low_mode_from_nfs4(state
->group
.allow
, &pace
->e_perm
, flags
);
578 add_to_mask(state
, &state
->group
);
580 for (i
=0; i
< state
->groups
->n
; i
++) {
582 pace
->e_tag
= ACL_GROUP
;
583 error
= check_deny(state
->groups
->aces
[i
].perms
.deny
, 0);
586 low_mode_from_nfs4(state
->groups
->aces
[i
].perms
.allow
,
587 &pace
->e_perm
, flags
);
588 pace
->e_gid
= state
->groups
->aces
[i
].gid
;
589 add_to_mask(state
, &state
->groups
->aces
[i
].perms
);
592 if (!state
->users
->n
&& !state
->groups
->n
) {
594 pace
->e_tag
= ACL_MASK
;
595 low_mode_from_nfs4(state
->mask
.allow
, &pace
->e_perm
, flags
);
599 pace
->e_tag
= ACL_OTHER
;
600 error
= check_deny(state
->other
.deny
, 0);
603 low_mode_from_nfs4(state
->other
.allow
, &pace
->e_perm
, flags
);
607 posix_acl_release(pacl
);
608 return ERR_PTR(error
);
611 static inline void allow_bits(struct posix_ace_state
*astate
, u32 mask
)
613 /* Allow all bits in the mask not already denied: */
614 astate
->allow
|= mask
& ~astate
->deny
;
617 static inline void deny_bits(struct posix_ace_state
*astate
, u32 mask
)
619 /* Deny all bits in the mask not already allowed: */
620 astate
->deny
|= mask
& ~astate
->allow
;
623 static int find_uid(struct posix_acl_state
*state
, kuid_t uid
)
625 struct posix_ace_state_array
*a
= state
->users
;
628 for (i
= 0; i
< a
->n
; i
++)
629 if (uid_eq(a
->aces
[i
].uid
, uid
))
633 a
->aces
[i
].uid
= uid
;
634 a
->aces
[i
].perms
.allow
= state
->everyone
.allow
;
635 a
->aces
[i
].perms
.deny
= state
->everyone
.deny
;
640 static int find_gid(struct posix_acl_state
*state
, kgid_t gid
)
642 struct posix_ace_state_array
*a
= state
->groups
;
645 for (i
= 0; i
< a
->n
; i
++)
646 if (gid_eq(a
->aces
[i
].gid
, gid
))
650 a
->aces
[i
].gid
= gid
;
651 a
->aces
[i
].perms
.allow
= state
->everyone
.allow
;
652 a
->aces
[i
].perms
.deny
= state
->everyone
.deny
;
657 static void deny_bits_array(struct posix_ace_state_array
*a
, u32 mask
)
661 for (i
=0; i
< a
->n
; i
++)
662 deny_bits(&a
->aces
[i
].perms
, mask
);
665 static void allow_bits_array(struct posix_ace_state_array
*a
, u32 mask
)
669 for (i
=0; i
< a
->n
; i
++)
670 allow_bits(&a
->aces
[i
].perms
, mask
);
673 static void process_one_v4_ace(struct posix_acl_state
*state
,
674 struct nfs4_ace
*ace
)
676 u32 mask
= ace
->access_mask
;
681 switch (ace2type(ace
)) {
683 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
684 allow_bits(&state
->owner
, mask
);
686 deny_bits(&state
->owner
, mask
);
690 i
= find_uid(state
, ace
->who_uid
);
691 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
692 allow_bits(&state
->users
->aces
[i
].perms
, mask
);
694 deny_bits(&state
->users
->aces
[i
].perms
, mask
);
695 mask
= state
->users
->aces
[i
].perms
.deny
;
696 deny_bits(&state
->owner
, mask
);
700 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
701 allow_bits(&state
->group
, mask
);
703 deny_bits(&state
->group
, mask
);
704 mask
= state
->group
.deny
;
705 deny_bits(&state
->owner
, mask
);
706 deny_bits(&state
->everyone
, mask
);
707 deny_bits_array(state
->users
, mask
);
708 deny_bits_array(state
->groups
, mask
);
712 i
= find_gid(state
, ace
->who_gid
);
713 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
714 allow_bits(&state
->groups
->aces
[i
].perms
, mask
);
716 deny_bits(&state
->groups
->aces
[i
].perms
, mask
);
717 mask
= state
->groups
->aces
[i
].perms
.deny
;
718 deny_bits(&state
->owner
, mask
);
719 deny_bits(&state
->group
, mask
);
720 deny_bits(&state
->everyone
, mask
);
721 deny_bits_array(state
->users
, mask
);
722 deny_bits_array(state
->groups
, mask
);
726 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
727 allow_bits(&state
->owner
, mask
);
728 allow_bits(&state
->group
, mask
);
729 allow_bits(&state
->other
, mask
);
730 allow_bits(&state
->everyone
, mask
);
731 allow_bits_array(state
->users
, mask
);
732 allow_bits_array(state
->groups
, mask
);
734 deny_bits(&state
->owner
, mask
);
735 deny_bits(&state
->group
, mask
);
736 deny_bits(&state
->other
, mask
);
737 deny_bits(&state
->everyone
, mask
);
738 deny_bits_array(state
->users
, mask
);
739 deny_bits_array(state
->groups
, mask
);
744 static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl
*acl
,
745 struct posix_acl
**pacl
, struct posix_acl
**dpacl
,
748 struct posix_acl_state effective_acl_state
, default_acl_state
;
749 struct nfs4_ace
*ace
;
752 ret
= init_state(&effective_acl_state
, acl
->naces
);
755 ret
= init_state(&default_acl_state
, acl
->naces
);
759 for (ace
= acl
->aces
; ace
< acl
->aces
+ acl
->naces
; ace
++) {
760 if (ace
->type
!= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
&&
761 ace
->type
!= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
)
763 if (ace
->flag
& ~NFS4_SUPPORTED_FLAGS
)
765 if ((ace
->flag
& NFS4_INHERITANCE_FLAGS
) == 0) {
766 process_one_v4_ace(&effective_acl_state
, ace
);
769 if (!(flags
& NFS4_ACL_DIR
))
772 * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
773 * is set, we're effectively turning on the other. That's OK,
774 * according to rfc 3530.
776 process_one_v4_ace(&default_acl_state
, ace
);
778 if (!(ace
->flag
& NFS4_ACE_INHERIT_ONLY_ACE
))
779 process_one_v4_ace(&effective_acl_state
, ace
);
781 *pacl
= posix_state_to_acl(&effective_acl_state
, flags
);
783 ret
= PTR_ERR(*pacl
);
787 *dpacl
= posix_state_to_acl(&default_acl_state
,
788 flags
| NFS4_ACL_TYPE_DEFAULT
);
789 if (IS_ERR(*dpacl
)) {
790 ret
= PTR_ERR(*dpacl
);
792 posix_acl_release(*pacl
);
800 free_state(&default_acl_state
);
802 free_state(&effective_acl_state
);
807 nfsd4_set_nfs4_acl(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
808 struct nfs4_acl
*acl
)
812 struct dentry
*dentry
;
814 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
815 unsigned int flags
= 0;
818 error
= fh_verify(rqstp
, fhp
, 0, NFSD_MAY_SATTR
);
822 dentry
= fhp
->fh_dentry
;
823 inode
= dentry
->d_inode
;
825 if (!inode
->i_op
->set_acl
|| !IS_POSIXACL(inode
))
826 return nfserr_attrnotsupp
;
828 if (S_ISDIR(inode
->i_mode
))
829 flags
= NFS4_ACL_DIR
;
831 host_error
= nfs4_acl_nfsv4_to_posix(acl
, &pacl
, &dpacl
, flags
);
832 if (host_error
== -EINVAL
)
833 return nfserr_attrnotsupp
;
837 host_error
= inode
->i_op
->set_acl(inode
, pacl
, ACL_TYPE_ACCESS
);
841 if (S_ISDIR(inode
->i_mode
)) {
842 host_error
= inode
->i_op
->set_acl(inode
, dpacl
,
847 posix_acl_release(pacl
);
848 posix_acl_release(dpacl
);
850 if (host_error
== -EOPNOTSUPP
)
851 return nfserr_attrnotsupp
;
853 return nfserrno(host_error
);
858 ace2type(struct nfs4_ace
*ace
)
860 switch (ace
->whotype
) {
861 case NFS4_ACL_WHO_NAMED
:
862 return (ace
->flag
& NFS4_ACE_IDENTIFIER_GROUP
?
863 ACL_GROUP
: ACL_USER
);
864 case NFS4_ACL_WHO_OWNER
:
866 case NFS4_ACL_WHO_GROUP
:
867 return ACL_GROUP_OBJ
;
868 case NFS4_ACL_WHO_EVERYONE
:
878 struct nfs4_acl
*acl
;
880 acl
= kmalloc(sizeof(*acl
) + n
*sizeof(struct nfs4_ace
), GFP_KERNEL
);
894 .stringlen
= sizeof("OWNER@") - 1,
895 .type
= NFS4_ACL_WHO_OWNER
,
899 .stringlen
= sizeof("GROUP@") - 1,
900 .type
= NFS4_ACL_WHO_GROUP
,
903 .string
= "EVERYONE@",
904 .stringlen
= sizeof("EVERYONE@") - 1,
905 .type
= NFS4_ACL_WHO_EVERYONE
,
910 nfs4_acl_get_whotype(char *p
, u32 len
)
914 for (i
= 0; i
< ARRAY_SIZE(s2t_map
); i
++) {
915 if (s2t_map
[i
].stringlen
== len
&&
916 0 == memcmp(s2t_map
[i
].string
, p
, len
))
917 return s2t_map
[i
].type
;
919 return NFS4_ACL_WHO_NAMED
;
922 __be32
nfs4_acl_write_who(int who
, __be32
**p
, int *len
)
927 for (i
= 0; i
< ARRAY_SIZE(s2t_map
); i
++) {
928 if (s2t_map
[i
].type
!= who
)
930 bytes
= 4 + (XDR_QUADLEN(s2t_map
[i
].stringlen
) << 2);
932 return nfserr_resource
;
933 *p
= xdr_encode_opaque(*p
, s2t_map
[i
].string
,
934 s2t_map
[i
].stringlen
);