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(u32 allow_mask, unsigned int flags)
94 u32 ret = ~allow_mask & ~NFS4_MASK_UNSUPP;
95 if (!(flags & NFS4_ACL_DIR))
96 ret &= ~NFS4_ACE_DELETE_CHILD;
100 /* XXX: modify functions to return NFS errors; they're only ever
101 * used by nfs code, after all.... */
103 /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
104 * side of being more restrictive, so the mode bit mapping below is
105 * pessimistic. An optimistic version would be needed to handle DENY's,
106 * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
110 low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
112 u32 write_mode = NFS4_WRITE_MODE;
114 if (flags & NFS4_ACL_DIR)
115 write_mode |= NFS4_ACE_DELETE_CHILD;
117 if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
119 if ((perm & write_mode) == write_mode)
121 if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
122 *mode |= ACL_EXECUTE;
125 struct ace_container {
126 struct nfs4_ace *ace;
127 struct list_head ace_l;
130 static short ace2type(struct nfs4_ace *);
131 static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
133 void nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);
136 nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
139 struct nfs4_acl *acl;
143 if (posix_acl_valid(pacl) < 0)
144 return ERR_PTR(-EINVAL);
145 size += 2*pacl->a_count;
148 if (posix_acl_valid(dpacl) < 0)
149 return ERR_PTR(-EINVAL);
150 size += 2*dpacl->a_count;
153 /* Allocate for worst case: one (deny, allow) pair each: */
154 acl = nfs4_acl_new(size);
156 return ERR_PTR(-ENOMEM);
159 _posix_to_nfsv4_one(pacl, acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
162 _posix_to_nfsv4_one(dpacl, acl, flags | NFS4_ACL_TYPE_DEFAULT);
168 nfs4_acl_add_pair(struct nfs4_acl *acl, int eflag, u32 mask, int whotype,
169 uid_t owner, unsigned int flags)
171 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
172 eflag, mask, whotype, owner);
173 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
174 eflag, deny_mask(mask, flags), whotype, owner);
177 /* We assume the acl has been verified with posix_acl_valid. */
179 _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
182 struct posix_acl_entry *pa, *pe, *group_owner_entry;
184 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
185 NFS4_INHERITANCE_FLAGS : 0);
187 BUG_ON(pacl->a_count < 3);
188 pe = pacl->a_entries + pacl->a_count;
189 pa = pe - 2; /* if mask entry exists, it's second from the last. */
190 if (pa->e_tag == ACL_MASK)
191 mask_mask = deny_mask(mask_from_posix(pa->e_perm, flags), flags);
195 pa = pacl->a_entries;
196 BUG_ON(pa->e_tag != ACL_USER_OBJ);
197 mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
198 nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags);
201 while (pa->e_tag == ACL_USER) {
202 mask = mask_from_posix(pa->e_perm, flags);
203 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
204 eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id);
206 nfs4_acl_add_pair(acl, eflag, mask,
207 NFS4_ACL_WHO_NAMED, pa->e_id, flags);
211 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
212 * since a user can be in more than one group. */
216 if (pacl->a_count > 3) {
217 BUG_ON(pa->e_tag != ACL_GROUP_OBJ);
218 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
219 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
220 NFS4_ACL_WHO_GROUP, 0);
222 group_owner_entry = pa;
223 mask = mask_from_posix(pa->e_perm, flags);
224 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
225 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
226 NFS4_ACL_WHO_GROUP, 0);
229 while (pa->e_tag == ACL_GROUP) {
230 mask = mask_from_posix(pa->e_perm, flags);
231 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
232 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
233 NFS4_ACL_WHO_NAMED, pa->e_id);
234 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
235 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
236 NFS4_ACL_WHO_NAMED, pa->e_id);
242 pa = group_owner_entry;
243 mask = mask_from_posix(pa->e_perm, flags);
244 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
245 NFS4_ACE_IDENTIFIER_GROUP | eflag,
246 deny_mask(mask, flags), NFS4_ACL_WHO_GROUP, 0);
248 while (pa->e_tag == ACL_GROUP) {
249 mask = mask_from_posix(pa->e_perm, flags);
250 nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
251 NFS4_ACE_IDENTIFIER_GROUP | eflag,
252 deny_mask(mask, flags), NFS4_ACL_WHO_NAMED, pa->e_id);
256 if (pa->e_tag == ACL_MASK)
258 BUG_ON(pa->e_tag != ACL_OTHER);
259 mask = mask_from_posix(pa->e_perm, flags);
260 nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags);
264 sort_pacl_range(struct posix_acl *pacl, int start, int end) {
266 struct posix_acl_entry tmp;
268 /* We just do a bubble sort; easy to do in place, and we're not
269 * expecting acl's to be long enough to justify anything more. */
272 for (i = start; i < end; i++) {
273 if (pacl->a_entries[i].e_id
274 > pacl->a_entries[i+1].e_id) {
276 tmp = pacl->a_entries[i];
277 pacl->a_entries[i] = pacl->a_entries[i+1];
278 pacl->a_entries[i+1] = tmp;
285 sort_pacl(struct posix_acl *pacl)
287 /* posix_acl_valid requires that users and groups be in order
291 if (pacl->a_count <= 4)
292 return; /* no users or groups */
294 while (pacl->a_entries[i].e_tag == ACL_USER)
296 sort_pacl_range(pacl, 1, i-1);
298 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
300 while (pacl->a_entries[j].e_tag == ACL_GROUP)
302 sort_pacl_range(pacl, i, j-1);
307 * While processing the NFSv4 ACE, this maintains bitmasks representing
308 * which permission bits have been allowed and which denied to a given
310 struct posix_ace_state {
315 struct posix_user_ace_state {
317 struct posix_ace_state perms;
320 struct posix_ace_state_array {
322 struct posix_user_ace_state aces[];
326 * While processing the NFSv4 ACE, this maintains the partial permissions
327 * calculated so far: */
329 struct posix_acl_state {
330 struct posix_ace_state owner;
331 struct posix_ace_state group;
332 struct posix_ace_state other;
333 struct posix_ace_state everyone;
334 struct posix_ace_state mask; /* Deny unused in this case */
335 struct posix_ace_state_array *users;
336 struct posix_ace_state_array *groups;
340 init_state(struct posix_acl_state *state, int cnt)
344 memset(state, 0, sizeof(struct posix_acl_state));
346 * In the worst case, each individual acl could be for a distinct
347 * named user or group, but we don't no which, so we allocate
348 * enough space for either:
350 alloc = sizeof(struct posix_ace_state_array)
351 + cnt*sizeof(struct posix_ace_state);
352 state->users = kzalloc(alloc, GFP_KERNEL);
355 state->groups = kzalloc(alloc, GFP_KERNEL);
356 if (!state->groups) {
364 free_state(struct posix_acl_state *state) {
366 kfree(state->groups);
369 static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
371 state->mask.allow |= astate->allow;
375 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
376 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
377 * to traditional read/write/execute permissions.
379 * It's problematic to reject acls that use certain mode bits, because it
380 * places the burden on users to learn the rules about which bits one
381 * particular server sets, without giving the user a lot of help--we return an
382 * error that could mean any number of different things. To make matters
383 * worse, the problematic bits might be introduced by some application that's
384 * automatically mapping from some other acl model.
386 * So wherever possible we accept anything, possibly erring on the side of
387 * denying more permissions than necessary.
389 * However we do reject *explicit* DENY's of a few bits representing
390 * permissions we could never deny:
393 static inline int check_deny(u32 mask, int isowner)
395 if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
399 if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
404 static struct posix_acl *
405 posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
407 struct posix_acl_entry *pace;
408 struct posix_acl *pacl;
412 nace = 4 + state->users->n + state->groups->n;
413 pacl = posix_acl_alloc(nace, GFP_KERNEL);
415 return ERR_PTR(-ENOMEM);
417 pace = pacl->a_entries;
418 pace->e_tag = ACL_USER_OBJ;
419 error = check_deny(state->owner.deny, 1);
422 low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags);
423 pace->e_id = ACL_UNDEFINED_ID;
425 for (i=0; i < state->users->n; i++) {
427 pace->e_tag = ACL_USER;
428 error = check_deny(state->users->aces[i].perms.deny, 0);
431 low_mode_from_nfs4(state->users->aces[i].perms.allow,
432 &pace->e_perm, flags);
433 pace->e_id = state->users->aces[i].uid;
434 add_to_mask(state, &state->users->aces[i].perms);
438 pace->e_tag = ACL_GROUP_OBJ;
439 error = check_deny(state->group.deny, 0);
442 low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags);
443 pace->e_id = ACL_UNDEFINED_ID;
444 add_to_mask(state, &state->group);
446 for (i=0; i < state->groups->n; i++) {
448 pace->e_tag = ACL_GROUP;
449 error = check_deny(state->groups->aces[i].perms.deny, 0);
452 low_mode_from_nfs4(state->groups->aces[i].perms.allow,
453 &pace->e_perm, flags);
454 pace->e_id = state->groups->aces[i].uid;
455 add_to_mask(state, &state->groups->aces[i].perms);
459 pace->e_tag = ACL_MASK;
460 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
461 pace->e_id = ACL_UNDEFINED_ID;
464 pace->e_tag = ACL_OTHER;
465 error = check_deny(state->other.deny, 0);
468 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
469 pace->e_id = ACL_UNDEFINED_ID;
473 posix_acl_release(pacl);
474 return ERR_PTR(error);
477 static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
479 /* Allow all bits in the mask not already denied: */
480 astate->allow |= mask & ~astate->deny;
483 static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
485 /* Deny all bits in the mask not already allowed: */
486 astate->deny |= mask & ~astate->allow;
489 static int find_uid(struct posix_acl_state *state, struct posix_ace_state_array *a, uid_t uid)
493 for (i = 0; i < a->n; i++)
494 if (a->aces[i].uid == uid)
498 a->aces[i].uid = uid;
499 a->aces[i].perms.allow = state->everyone.allow;
500 a->aces[i].perms.deny = state->everyone.deny;
505 static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
509 for (i=0; i < a->n; i++)
510 deny_bits(&a->aces[i].perms, mask);
513 static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
517 for (i=0; i < a->n; i++)
518 allow_bits(&a->aces[i].perms, mask);
521 static void process_one_v4_ace(struct posix_acl_state *state,
522 struct nfs4_ace *ace)
524 u32 mask = ace->access_mask;
527 switch (ace2type(ace)) {
529 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
530 allow_bits(&state->owner, mask);
532 deny_bits(&state->owner, mask);
536 i = find_uid(state, state->users, ace->who);
537 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
538 allow_bits(&state->users->aces[i].perms, mask);
540 deny_bits(&state->users->aces[i].perms, mask);
541 mask = state->users->aces[i].perms.deny;
542 deny_bits(&state->owner, mask);
546 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
547 allow_bits(&state->group, mask);
549 deny_bits(&state->group, mask);
550 mask = state->group.deny;
551 deny_bits(&state->owner, mask);
552 deny_bits(&state->everyone, mask);
553 deny_bits_array(state->users, mask);
554 deny_bits_array(state->groups, mask);
558 i = find_uid(state, state->groups, ace->who);
559 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
560 allow_bits(&state->groups->aces[i].perms, mask);
562 deny_bits(&state->groups->aces[i].perms, mask);
563 mask = state->groups->aces[i].perms.deny;
564 deny_bits(&state->owner, mask);
565 deny_bits(&state->group, mask);
566 deny_bits(&state->everyone, mask);
567 deny_bits_array(state->users, mask);
568 deny_bits_array(state->groups, mask);
572 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
573 allow_bits(&state->owner, mask);
574 allow_bits(&state->group, mask);
575 allow_bits(&state->other, mask);
576 allow_bits(&state->everyone, mask);
577 allow_bits_array(state->users, mask);
578 allow_bits_array(state->groups, mask);
580 deny_bits(&state->owner, mask);
581 deny_bits(&state->group, mask);
582 deny_bits(&state->other, mask);
583 deny_bits(&state->everyone, mask);
584 deny_bits_array(state->users, mask);
585 deny_bits_array(state->groups, mask);
590 int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
591 struct posix_acl **dpacl, unsigned int flags)
593 struct posix_acl_state effective_acl_state, default_acl_state;
594 struct nfs4_ace *ace;
597 ret = init_state(&effective_acl_state, acl->naces);
600 ret = init_state(&default_acl_state, acl->naces);
604 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
605 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
606 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
608 if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
610 if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
611 process_one_v4_ace(&effective_acl_state, ace);
614 if (!(flags & NFS4_ACL_DIR))
617 * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
618 * is set, we're effectively turning on the other. That's OK,
619 * according to rfc 3530.
621 process_one_v4_ace(&default_acl_state, ace);
623 if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
624 process_one_v4_ace(&effective_acl_state, ace);
626 *pacl = posix_state_to_acl(&effective_acl_state, flags);
628 ret = PTR_ERR(*pacl);
631 *dpacl = posix_state_to_acl(&default_acl_state, flags);
632 if (IS_ERR(*dpacl)) {
633 ret = PTR_ERR(*dpacl);
634 posix_acl_release(*pacl);
641 free_state(&default_acl_state);
643 free_state(&effective_acl_state);
648 ace2type(struct nfs4_ace *ace)
650 switch (ace->whotype) {
651 case NFS4_ACL_WHO_NAMED:
652 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
653 ACL_GROUP : ACL_USER);
654 case NFS4_ACL_WHO_OWNER:
656 case NFS4_ACL_WHO_GROUP:
657 return ACL_GROUP_OBJ;
658 case NFS4_ACL_WHO_EVERYONE:
665 EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4);
666 EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix);
671 struct nfs4_acl *acl;
673 acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL);
681 nfs4_acl_add_ace(struct nfs4_acl *acl, u32 type, u32 flag, u32 access_mask,
682 int whotype, uid_t who)
684 struct nfs4_ace *ace = acl->aces + acl->naces;
688 ace->access_mask = access_mask;
689 ace->whotype = whotype;
702 .stringlen = sizeof("OWNER@") - 1,
703 .type = NFS4_ACL_WHO_OWNER,
707 .stringlen = sizeof("GROUP@") - 1,
708 .type = NFS4_ACL_WHO_GROUP,
711 .string = "EVERYONE@",
712 .stringlen = sizeof("EVERYONE@") - 1,
713 .type = NFS4_ACL_WHO_EVERYONE,
718 nfs4_acl_get_whotype(char *p, u32 len)
722 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
723 if (s2t_map[i].stringlen == len &&
724 0 == memcmp(s2t_map[i].string, p, len))
725 return s2t_map[i].type;
727 return NFS4_ACL_WHO_NAMED;
731 nfs4_acl_write_who(int who, char *p)
735 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
736 if (s2t_map[i].type == who) {
737 memcpy(p, s2t_map[i].string, s2t_map[i].stringlen);
738 return s2t_map[i].stringlen;
745 EXPORT_SYMBOL(nfs4_acl_new);
746 EXPORT_SYMBOL(nfs4_acl_add_ace);
747 EXPORT_SYMBOL(nfs4_acl_get_whotype);
748 EXPORT_SYMBOL(nfs4_acl_write_who);