4 * Common NFSv4 ACL handling code.
6 * Copyright (c) 2002, 2003 The Regents of the University of Michigan.
9 * Marius Aamodt Eriksen <marius@umich.edu>
10 * Jeff Sedlak <jsedlak@umich.edu>
11 * J. Bruce Fields <bfields@umich.edu>
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of the University nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
29 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
33 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <linux/string.h>
40 #include <linux/slab.h>
41 #include <linux/list.h>
42 #include <linux/types.h>
44 #include <linux/module.h>
45 #include <linux/nfs_fs.h>
46 #include <linux/posix_acl.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs4_acl.h>
51 /* mode bit translations: */
52 #define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
53 #define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
54 #define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
55 #define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
56 #define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
58 /* We don't support these bits; insist they be neither allowed nor denied */
59 #define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \
60 | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS)
62 /* flags used to simulate posix default ACLs */
63 #define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
64 | NFS4_ACE_DIRECTORY_INHERIT_ACE)
66 #define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
67 | NFS4_ACE_INHERIT_ONLY_ACE \
68 | NFS4_ACE_IDENTIFIER_GROUP)
70 #define MASK_EQUAL(mask1, mask2) \
71 ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
74 mask_from_posix(unsigned short perm
, unsigned int flags
)
76 int mask
= NFS4_ANYONE_MODE
;
78 if (flags
& NFS4_ACL_OWNER
)
79 mask
|= NFS4_OWNER_MODE
;
81 mask
|= NFS4_READ_MODE
;
83 mask
|= NFS4_WRITE_MODE
;
84 if ((perm
& ACL_WRITE
) && (flags
& NFS4_ACL_DIR
))
85 mask
|= NFS4_ACE_DELETE_CHILD
;
86 if (perm
& ACL_EXECUTE
)
87 mask
|= NFS4_EXECUTE_MODE
;
92 deny_mask_from_posix(unsigned short perm
, u32 flags
)
97 mask
|= NFS4_READ_MODE
;
99 mask
|= NFS4_WRITE_MODE
;
100 if ((perm
& ACL_WRITE
) && (flags
& NFS4_ACL_DIR
))
101 mask
|= NFS4_ACE_DELETE_CHILD
;
102 if (perm
& ACL_EXECUTE
)
103 mask
|= NFS4_EXECUTE_MODE
;
107 /* XXX: modify functions to return NFS errors; they're only ever
108 * used by nfs code, after all.... */
110 /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
111 * side of being more restrictive, so the mode bit mapping below is
112 * pessimistic. An optimistic version would be needed to handle DENY's,
113 * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
117 low_mode_from_nfs4(u32 perm
, unsigned short *mode
, unsigned int flags
)
119 u32 write_mode
= NFS4_WRITE_MODE
;
121 if (flags
& NFS4_ACL_DIR
)
122 write_mode
|= NFS4_ACE_DELETE_CHILD
;
124 if ((perm
& NFS4_READ_MODE
) == NFS4_READ_MODE
)
126 if ((perm
& write_mode
) == write_mode
)
128 if ((perm
& NFS4_EXECUTE_MODE
) == NFS4_EXECUTE_MODE
)
129 *mode
|= ACL_EXECUTE
;
132 struct ace_container
{
133 struct nfs4_ace
*ace
;
134 struct list_head ace_l
;
137 static short ace2type(struct nfs4_ace
*);
138 static void _posix_to_nfsv4_one(struct posix_acl
*, struct nfs4_acl
*,
140 void nfs4_acl_add_ace(struct nfs4_acl
*, u32
, u32
, u32
, int, uid_t
);
143 nfs4_acl_posix_to_nfsv4(struct posix_acl
*pacl
, struct posix_acl
*dpacl
,
146 struct nfs4_acl
*acl
;
150 if (posix_acl_valid(pacl
) < 0)
151 return ERR_PTR(-EINVAL
);
152 size
+= 2*pacl
->a_count
;
155 if (posix_acl_valid(dpacl
) < 0)
156 return ERR_PTR(-EINVAL
);
157 size
+= 2*dpacl
->a_count
;
160 /* Allocate for worst case: one (deny, allow) pair each: */
161 acl
= nfs4_acl_new(size
);
163 return ERR_PTR(-ENOMEM
);
166 _posix_to_nfsv4_one(pacl
, acl
, flags
& ~NFS4_ACL_TYPE_DEFAULT
);
169 _posix_to_nfsv4_one(dpacl
, acl
, flags
| NFS4_ACL_TYPE_DEFAULT
);
174 struct posix_acl_summary
{
175 unsigned short owner
;
176 unsigned short users
;
177 unsigned short group
;
178 unsigned short groups
;
179 unsigned short other
;
184 summarize_posix_acl(struct posix_acl
*acl
, struct posix_acl_summary
*pas
)
186 struct posix_acl_entry
*pa
, *pe
;
191 pe
= acl
->a_entries
+ acl
->a_count
;
193 FOREACH_ACL_ENTRY(pa
, acl
, pe
) {
196 pas
->owner
= pa
->e_perm
;
199 pas
->group
= pa
->e_perm
;
202 pas
->users
|= pa
->e_perm
;
205 pas
->groups
|= pa
->e_perm
;
208 pas
->other
= pa
->e_perm
;
211 pas
->mask
= pa
->e_perm
;
215 /* We'll only care about effective permissions: */
216 pas
->users
&= pas
->mask
;
217 pas
->group
&= pas
->mask
;
218 pas
->groups
&= pas
->mask
;
221 /* We assume the acl has been verified with posix_acl_valid. */
223 _posix_to_nfsv4_one(struct posix_acl
*pacl
, struct nfs4_acl
*acl
,
226 struct posix_acl_entry
*pa
, *group_owner_entry
;
227 struct nfs4_ace
*ace
;
228 struct posix_acl_summary pas
;
230 int eflag
= ((flags
& NFS4_ACL_TYPE_DEFAULT
) ?
231 NFS4_INHERITANCE_FLAGS
: 0);
233 BUG_ON(pacl
->a_count
< 3);
234 summarize_posix_acl(pacl
, &pas
);
236 pa
= pacl
->a_entries
;
237 ace
= acl
->aces
+ acl
->naces
;
239 /* We could deny everything not granted by the owner: */
242 * but it is equivalent (and simpler) to deny only what is not
243 * granted by later entries:
245 deny
&= pas
.users
| pas
.group
| pas
.groups
| pas
.other
;
247 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
249 ace
->access_mask
= deny_mask_from_posix(deny
, flags
);
250 ace
->whotype
= NFS4_ACL_WHO_OWNER
;
255 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
257 ace
->access_mask
= mask_from_posix(pa
->e_perm
, flags
| NFS4_ACL_OWNER
);
258 ace
->whotype
= NFS4_ACL_WHO_OWNER
;
263 while (pa
->e_tag
== ACL_USER
) {
264 deny
= ~(pa
->e_perm
& pas
.mask
);
265 deny
&= pas
.groups
| pas
.group
| pas
.other
;
267 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
269 ace
->access_mask
= deny_mask_from_posix(deny
, flags
);
270 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
275 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
277 ace
->access_mask
= mask_from_posix(pa
->e_perm
& pas
.mask
,
279 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
286 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
287 * since a user can be in more than one group. */
291 group_owner_entry
= pa
;
293 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
295 ace
->access_mask
= mask_from_posix(pas
.group
, flags
);
296 ace
->whotype
= NFS4_ACL_WHO_GROUP
;
301 while (pa
->e_tag
== ACL_GROUP
) {
302 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
303 ace
->flag
= eflag
| NFS4_ACE_IDENTIFIER_GROUP
;
304 ace
->access_mask
= mask_from_posix(pa
->e_perm
& pas
.mask
,
306 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
315 pa
= group_owner_entry
;
317 deny
= ~pas
.group
& pas
.other
;
319 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
320 ace
->flag
= eflag
| NFS4_ACE_IDENTIFIER_GROUP
;
321 ace
->access_mask
= deny_mask_from_posix(deny
, flags
);
322 ace
->whotype
= NFS4_ACL_WHO_GROUP
;
328 while (pa
->e_tag
== ACL_GROUP
) {
329 deny
= ~(pa
->e_perm
& pas
.mask
);
332 ace
->type
= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
;
333 ace
->flag
= eflag
| NFS4_ACE_IDENTIFIER_GROUP
;
334 ace
->access_mask
= mask_from_posix(deny
, flags
);
335 ace
->whotype
= NFS4_ACL_WHO_NAMED
;
343 if (pa
->e_tag
== ACL_MASK
)
345 ace
->type
= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
;
347 ace
->access_mask
= mask_from_posix(pa
->e_perm
, flags
);
348 ace
->whotype
= NFS4_ACL_WHO_EVERYONE
;
353 sort_pacl_range(struct posix_acl
*pacl
, int start
, int end
) {
355 struct posix_acl_entry tmp
;
357 /* We just do a bubble sort; easy to do in place, and we're not
358 * expecting acl's to be long enough to justify anything more. */
361 for (i
= start
; i
< end
; i
++) {
362 if (pacl
->a_entries
[i
].e_id
363 > pacl
->a_entries
[i
+1].e_id
) {
365 tmp
= pacl
->a_entries
[i
];
366 pacl
->a_entries
[i
] = pacl
->a_entries
[i
+1];
367 pacl
->a_entries
[i
+1] = tmp
;
374 sort_pacl(struct posix_acl
*pacl
)
376 /* posix_acl_valid requires that users and groups be in order
380 if (pacl
->a_count
<= 4)
381 return; /* no users or groups */
383 while (pacl
->a_entries
[i
].e_tag
== ACL_USER
)
385 sort_pacl_range(pacl
, 1, i
-1);
387 BUG_ON(pacl
->a_entries
[i
].e_tag
!= ACL_GROUP_OBJ
);
389 while (pacl
->a_entries
[j
].e_tag
== ACL_GROUP
)
391 sort_pacl_range(pacl
, i
, j
-1);
396 * While processing the NFSv4 ACE, this maintains bitmasks representing
397 * which permission bits have been allowed and which denied to a given
399 struct posix_ace_state
{
404 struct posix_user_ace_state
{
406 struct posix_ace_state perms
;
409 struct posix_ace_state_array
{
411 struct posix_user_ace_state aces
[];
415 * While processing the NFSv4 ACE, this maintains the partial permissions
416 * calculated so far: */
418 struct posix_acl_state
{
420 struct posix_ace_state owner
;
421 struct posix_ace_state group
;
422 struct posix_ace_state other
;
423 struct posix_ace_state everyone
;
424 struct posix_ace_state mask
; /* Deny unused in this case */
425 struct posix_ace_state_array
*users
;
426 struct posix_ace_state_array
*groups
;
430 init_state(struct posix_acl_state
*state
, int cnt
)
434 memset(state
, 0, sizeof(struct posix_acl_state
));
437 * In the worst case, each individual acl could be for a distinct
438 * named user or group, but we don't no which, so we allocate
439 * enough space for either:
441 alloc
= sizeof(struct posix_ace_state_array
)
442 + cnt
*sizeof(struct posix_ace_state
);
443 state
->users
= kzalloc(alloc
, GFP_KERNEL
);
446 state
->groups
= kzalloc(alloc
, GFP_KERNEL
);
447 if (!state
->groups
) {
455 free_state(struct posix_acl_state
*state
) {
457 kfree(state
->groups
);
460 static inline void add_to_mask(struct posix_acl_state
*state
, struct posix_ace_state
*astate
)
462 state
->mask
.allow
|= astate
->allow
;
466 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
467 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
468 * to traditional read/write/execute permissions.
470 * It's problematic to reject acls that use certain mode bits, because it
471 * places the burden on users to learn the rules about which bits one
472 * particular server sets, without giving the user a lot of help--we return an
473 * error that could mean any number of different things. To make matters
474 * worse, the problematic bits might be introduced by some application that's
475 * automatically mapping from some other acl model.
477 * So wherever possible we accept anything, possibly erring on the side of
478 * denying more permissions than necessary.
480 * However we do reject *explicit* DENY's of a few bits representing
481 * permissions we could never deny:
484 static inline int check_deny(u32 mask
, int isowner
)
486 if (mask
& (NFS4_ACE_READ_ATTRIBUTES
| NFS4_ACE_READ_ACL
))
490 if (mask
& (NFS4_ACE_WRITE_ATTRIBUTES
| NFS4_ACE_WRITE_ACL
))
495 static struct posix_acl
*
496 posix_state_to_acl(struct posix_acl_state
*state
, unsigned int flags
)
498 struct posix_acl_entry
*pace
;
499 struct posix_acl
*pacl
;
504 * ACLs with no ACEs are treated differently in the inheritable
505 * and effective cases: when there are no inheritable ACEs, we
506 * set a zero-length default posix acl:
508 if (state
->empty
&& (flags
& NFS4_ACL_TYPE_DEFAULT
)) {
509 pacl
= posix_acl_alloc(0, GFP_KERNEL
);
510 return pacl
? pacl
: ERR_PTR(-ENOMEM
);
513 * When there are no effective ACEs, the following will end
514 * up setting a 3-element effective posix ACL with all
517 nace
= 4 + state
->users
->n
+ state
->groups
->n
;
518 pacl
= posix_acl_alloc(nace
, GFP_KERNEL
);
520 return ERR_PTR(-ENOMEM
);
522 pace
= pacl
->a_entries
;
523 pace
->e_tag
= ACL_USER_OBJ
;
524 error
= check_deny(state
->owner
.deny
, 1);
527 low_mode_from_nfs4(state
->owner
.allow
, &pace
->e_perm
, flags
);
528 pace
->e_id
= ACL_UNDEFINED_ID
;
530 for (i
=0; i
< state
->users
->n
; i
++) {
532 pace
->e_tag
= ACL_USER
;
533 error
= check_deny(state
->users
->aces
[i
].perms
.deny
, 0);
536 low_mode_from_nfs4(state
->users
->aces
[i
].perms
.allow
,
537 &pace
->e_perm
, flags
);
538 pace
->e_id
= state
->users
->aces
[i
].uid
;
539 add_to_mask(state
, &state
->users
->aces
[i
].perms
);
543 pace
->e_tag
= ACL_GROUP_OBJ
;
544 error
= check_deny(state
->group
.deny
, 0);
547 low_mode_from_nfs4(state
->group
.allow
, &pace
->e_perm
, flags
);
548 pace
->e_id
= ACL_UNDEFINED_ID
;
549 add_to_mask(state
, &state
->group
);
551 for (i
=0; i
< state
->groups
->n
; i
++) {
553 pace
->e_tag
= ACL_GROUP
;
554 error
= check_deny(state
->groups
->aces
[i
].perms
.deny
, 0);
557 low_mode_from_nfs4(state
->groups
->aces
[i
].perms
.allow
,
558 &pace
->e_perm
, flags
);
559 pace
->e_id
= state
->groups
->aces
[i
].uid
;
560 add_to_mask(state
, &state
->groups
->aces
[i
].perms
);
564 pace
->e_tag
= ACL_MASK
;
565 low_mode_from_nfs4(state
->mask
.allow
, &pace
->e_perm
, flags
);
566 pace
->e_id
= ACL_UNDEFINED_ID
;
569 pace
->e_tag
= ACL_OTHER
;
570 error
= check_deny(state
->other
.deny
, 0);
573 low_mode_from_nfs4(state
->other
.allow
, &pace
->e_perm
, flags
);
574 pace
->e_id
= ACL_UNDEFINED_ID
;
578 posix_acl_release(pacl
);
579 return ERR_PTR(error
);
582 static inline void allow_bits(struct posix_ace_state
*astate
, u32 mask
)
584 /* Allow all bits in the mask not already denied: */
585 astate
->allow
|= mask
& ~astate
->deny
;
588 static inline void deny_bits(struct posix_ace_state
*astate
, u32 mask
)
590 /* Deny all bits in the mask not already allowed: */
591 astate
->deny
|= mask
& ~astate
->allow
;
594 static int find_uid(struct posix_acl_state
*state
, struct posix_ace_state_array
*a
, uid_t uid
)
598 for (i
= 0; i
< a
->n
; i
++)
599 if (a
->aces
[i
].uid
== uid
)
603 a
->aces
[i
].uid
= uid
;
604 a
->aces
[i
].perms
.allow
= state
->everyone
.allow
;
605 a
->aces
[i
].perms
.deny
= state
->everyone
.deny
;
610 static void deny_bits_array(struct posix_ace_state_array
*a
, u32 mask
)
614 for (i
=0; i
< a
->n
; i
++)
615 deny_bits(&a
->aces
[i
].perms
, mask
);
618 static void allow_bits_array(struct posix_ace_state_array
*a
, u32 mask
)
622 for (i
=0; i
< a
->n
; i
++)
623 allow_bits(&a
->aces
[i
].perms
, mask
);
626 static void process_one_v4_ace(struct posix_acl_state
*state
,
627 struct nfs4_ace
*ace
)
629 u32 mask
= ace
->access_mask
;
634 switch (ace2type(ace
)) {
636 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
637 allow_bits(&state
->owner
, mask
);
639 deny_bits(&state
->owner
, mask
);
643 i
= find_uid(state
, state
->users
, ace
->who
);
644 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
645 allow_bits(&state
->users
->aces
[i
].perms
, mask
);
647 deny_bits(&state
->users
->aces
[i
].perms
, mask
);
648 mask
= state
->users
->aces
[i
].perms
.deny
;
649 deny_bits(&state
->owner
, mask
);
653 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
654 allow_bits(&state
->group
, mask
);
656 deny_bits(&state
->group
, mask
);
657 mask
= state
->group
.deny
;
658 deny_bits(&state
->owner
, mask
);
659 deny_bits(&state
->everyone
, mask
);
660 deny_bits_array(state
->users
, mask
);
661 deny_bits_array(state
->groups
, mask
);
665 i
= find_uid(state
, state
->groups
, ace
->who
);
666 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
667 allow_bits(&state
->groups
->aces
[i
].perms
, mask
);
669 deny_bits(&state
->groups
->aces
[i
].perms
, mask
);
670 mask
= state
->groups
->aces
[i
].perms
.deny
;
671 deny_bits(&state
->owner
, mask
);
672 deny_bits(&state
->group
, mask
);
673 deny_bits(&state
->everyone
, mask
);
674 deny_bits_array(state
->users
, mask
);
675 deny_bits_array(state
->groups
, mask
);
679 if (ace
->type
== NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
) {
680 allow_bits(&state
->owner
, mask
);
681 allow_bits(&state
->group
, mask
);
682 allow_bits(&state
->other
, mask
);
683 allow_bits(&state
->everyone
, mask
);
684 allow_bits_array(state
->users
, mask
);
685 allow_bits_array(state
->groups
, mask
);
687 deny_bits(&state
->owner
, mask
);
688 deny_bits(&state
->group
, mask
);
689 deny_bits(&state
->other
, mask
);
690 deny_bits(&state
->everyone
, mask
);
691 deny_bits_array(state
->users
, mask
);
692 deny_bits_array(state
->groups
, mask
);
697 int nfs4_acl_nfsv4_to_posix(struct nfs4_acl
*acl
, struct posix_acl
**pacl
,
698 struct posix_acl
**dpacl
, unsigned int flags
)
700 struct posix_acl_state effective_acl_state
, default_acl_state
;
701 struct nfs4_ace
*ace
;
704 ret
= init_state(&effective_acl_state
, acl
->naces
);
707 ret
= init_state(&default_acl_state
, acl
->naces
);
711 for (ace
= acl
->aces
; ace
< acl
->aces
+ acl
->naces
; ace
++) {
712 if (ace
->type
!= NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE
&&
713 ace
->type
!= NFS4_ACE_ACCESS_DENIED_ACE_TYPE
)
715 if (ace
->flag
& ~NFS4_SUPPORTED_FLAGS
)
717 if ((ace
->flag
& NFS4_INHERITANCE_FLAGS
) == 0) {
718 process_one_v4_ace(&effective_acl_state
, ace
);
721 if (!(flags
& NFS4_ACL_DIR
))
724 * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
725 * is set, we're effectively turning on the other. That's OK,
726 * according to rfc 3530.
728 process_one_v4_ace(&default_acl_state
, ace
);
730 if (!(ace
->flag
& NFS4_ACE_INHERIT_ONLY_ACE
))
731 process_one_v4_ace(&effective_acl_state
, ace
);
733 *pacl
= posix_state_to_acl(&effective_acl_state
, flags
);
735 ret
= PTR_ERR(*pacl
);
738 *dpacl
= posix_state_to_acl(&default_acl_state
,
739 flags
| NFS4_ACL_TYPE_DEFAULT
);
740 if (IS_ERR(*dpacl
)) {
741 ret
= PTR_ERR(*dpacl
);
742 posix_acl_release(*pacl
);
749 free_state(&default_acl_state
);
751 free_state(&effective_acl_state
);
756 ace2type(struct nfs4_ace
*ace
)
758 switch (ace
->whotype
) {
759 case NFS4_ACL_WHO_NAMED
:
760 return (ace
->flag
& NFS4_ACE_IDENTIFIER_GROUP
?
761 ACL_GROUP
: ACL_USER
);
762 case NFS4_ACL_WHO_OWNER
:
764 case NFS4_ACL_WHO_GROUP
:
765 return ACL_GROUP_OBJ
;
766 case NFS4_ACL_WHO_EVERYONE
:
773 EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4
);
774 EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix
);
779 struct nfs4_acl
*acl
;
781 acl
= kmalloc(sizeof(*acl
) + n
*sizeof(struct nfs4_ace
), GFP_KERNEL
);
789 nfs4_acl_add_ace(struct nfs4_acl
*acl
, u32 type
, u32 flag
, u32 access_mask
,
790 int whotype
, uid_t who
)
792 struct nfs4_ace
*ace
= acl
->aces
+ acl
->naces
;
796 ace
->access_mask
= access_mask
;
797 ace
->whotype
= whotype
;
810 .stringlen
= sizeof("OWNER@") - 1,
811 .type
= NFS4_ACL_WHO_OWNER
,
815 .stringlen
= sizeof("GROUP@") - 1,
816 .type
= NFS4_ACL_WHO_GROUP
,
819 .string
= "EVERYONE@",
820 .stringlen
= sizeof("EVERYONE@") - 1,
821 .type
= NFS4_ACL_WHO_EVERYONE
,
826 nfs4_acl_get_whotype(char *p
, u32 len
)
830 for (i
= 0; i
< ARRAY_SIZE(s2t_map
); i
++) {
831 if (s2t_map
[i
].stringlen
== len
&&
832 0 == memcmp(s2t_map
[i
].string
, p
, len
))
833 return s2t_map
[i
].type
;
835 return NFS4_ACL_WHO_NAMED
;
839 nfs4_acl_write_who(int who
, char *p
)
843 for (i
= 0; i
< ARRAY_SIZE(s2t_map
); i
++) {
844 if (s2t_map
[i
].type
== who
) {
845 memcpy(p
, s2t_map
[i
].string
, s2t_map
[i
].stringlen
);
846 return s2t_map
[i
].stringlen
;
853 EXPORT_SYMBOL(nfs4_acl_new
);
854 EXPORT_SYMBOL(nfs4_acl_add_ace
);
855 EXPORT_SYMBOL(nfs4_acl_get_whotype
);
856 EXPORT_SYMBOL(nfs4_acl_write_who
);