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/nfs_fs.h>
38 #include <linux/nfs4_acl.h>
41 /* mode bit translations: */
42 #define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
43 #define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
44 #define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
45 #define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
46 #define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
48 /* We don't support these bits; insist they be neither allowed nor denied */
49 #define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \
50 | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS)
52 /* flags used to simulate posix default ACLs */
53 #define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
54 | NFS4_ACE_DIRECTORY_INHERIT_ACE)
56 #define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
57 | NFS4_ACE_INHERIT_ONLY_ACE \
58 | NFS4_ACE_IDENTIFIER_GROUP)
60 #define MASK_EQUAL(mask1, mask2) \
61 ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
64 mask_from_posix(unsigned short perm, unsigned int flags)
66 int mask = NFS4_ANYONE_MODE;
68 if (flags & NFS4_ACL_OWNER)
69 mask |= NFS4_OWNER_MODE;
71 mask |= NFS4_READ_MODE;
73 mask |= NFS4_WRITE_MODE;
74 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
75 mask |= NFS4_ACE_DELETE_CHILD;
76 if (perm & ACL_EXECUTE)
77 mask |= NFS4_EXECUTE_MODE;
82 deny_mask_from_posix(unsigned short perm, u32 flags)
87 mask |= NFS4_READ_MODE;
89 mask |= NFS4_WRITE_MODE;
90 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
91 mask |= NFS4_ACE_DELETE_CHILD;
92 if (perm & ACL_EXECUTE)
93 mask |= NFS4_EXECUTE_MODE;
97 /* XXX: modify functions to return NFS errors; they're only ever
98 * used by nfs code, after all.... */
100 /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
101 * side of being more restrictive, so the mode bit mapping below is
102 * pessimistic. An optimistic version would be needed to handle DENY's,
103 * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
107 low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
109 u32 write_mode = NFS4_WRITE_MODE;
111 if (flags & NFS4_ACL_DIR)
112 write_mode |= NFS4_ACE_DELETE_CHILD;
114 if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
116 if ((perm & write_mode) == write_mode)
118 if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
119 *mode |= ACL_EXECUTE;
122 struct ace_container {
123 struct nfs4_ace *ace;
124 struct list_head ace_l;
127 static short ace2type(struct nfs4_ace *);
128 static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
132 nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
135 struct nfs4_acl *acl;
139 if (posix_acl_valid(pacl) < 0)
140 return ERR_PTR(-EINVAL);
141 size += 2*pacl->a_count;
144 if (posix_acl_valid(dpacl) < 0)
145 return ERR_PTR(-EINVAL);
146 size += 2*dpacl->a_count;
149 /* Allocate for worst case: one (deny, allow) pair each: */
150 acl = nfs4_acl_new(size);
152 return ERR_PTR(-ENOMEM);
155 _posix_to_nfsv4_one(pacl, acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
158 _posix_to_nfsv4_one(dpacl, acl, flags | NFS4_ACL_TYPE_DEFAULT);
163 struct posix_acl_summary {
164 unsigned short owner;
165 unsigned short users;
166 unsigned short group;
167 unsigned short groups;
168 unsigned short other;
173 summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas)
175 struct posix_acl_entry *pa, *pe;
178 * Only pas.users and pas.groups need initialization; previous
179 * posix_acl_valid() calls ensure that the other fields will be
180 * initialized in the following loop. But, just to placate gcc:
182 memset(pas, 0, sizeof(*pas));
185 pe = acl->a_entries + acl->a_count;
187 FOREACH_ACL_ENTRY(pa, acl, pe) {
190 pas->owner = pa->e_perm;
193 pas->group = pa->e_perm;
196 pas->users |= pa->e_perm;
199 pas->groups |= pa->e_perm;
202 pas->other = pa->e_perm;
205 pas->mask = pa->e_perm;
209 /* We'll only care about effective permissions: */
210 pas->users &= pas->mask;
211 pas->group &= pas->mask;
212 pas->groups &= pas->mask;
215 /* We assume the acl has been verified with posix_acl_valid. */
217 _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
220 struct posix_acl_entry *pa, *group_owner_entry;
221 struct nfs4_ace *ace;
222 struct posix_acl_summary pas;
224 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
225 NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0);
227 BUG_ON(pacl->a_count < 3);
228 summarize_posix_acl(pacl, &pas);
230 pa = pacl->a_entries;
231 ace = acl->aces + acl->naces;
233 /* We could deny everything not granted by the owner: */
236 * but it is equivalent (and simpler) to deny only what is not
237 * granted by later entries:
239 deny &= pas.users | pas.group | pas.groups | pas.other;
241 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
243 ace->access_mask = deny_mask_from_posix(deny, flags);
244 ace->whotype = NFS4_ACL_WHO_OWNER;
249 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
251 ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
252 ace->whotype = NFS4_ACL_WHO_OWNER;
257 while (pa->e_tag == ACL_USER) {
258 deny = ~(pa->e_perm & pas.mask);
259 deny &= pas.groups | pas.group | pas.other;
261 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
263 ace->access_mask = deny_mask_from_posix(deny, flags);
264 ace->whotype = NFS4_ACL_WHO_NAMED;
269 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
271 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
273 ace->whotype = NFS4_ACL_WHO_NAMED;
280 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
281 * since a user can be in more than one group. */
285 group_owner_entry = pa;
287 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
289 ace->access_mask = mask_from_posix(pas.group, flags);
290 ace->whotype = NFS4_ACL_WHO_GROUP;
295 while (pa->e_tag == ACL_GROUP) {
296 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
297 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
298 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
300 ace->whotype = NFS4_ACL_WHO_NAMED;
309 pa = group_owner_entry;
311 deny = ~pas.group & pas.other;
313 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
315 ace->access_mask = deny_mask_from_posix(deny, flags);
316 ace->whotype = NFS4_ACL_WHO_GROUP;
322 while (pa->e_tag == ACL_GROUP) {
323 deny = ~(pa->e_perm & pas.mask);
326 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
327 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
328 ace->access_mask = deny_mask_from_posix(deny, flags);
329 ace->whotype = NFS4_ACL_WHO_NAMED;
337 if (pa->e_tag == ACL_MASK)
339 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
341 ace->access_mask = mask_from_posix(pa->e_perm, flags);
342 ace->whotype = NFS4_ACL_WHO_EVERYONE;
347 sort_pacl_range(struct posix_acl *pacl, int start, int end) {
349 struct posix_acl_entry tmp;
351 /* We just do a bubble sort; easy to do in place, and we're not
352 * expecting acl's to be long enough to justify anything more. */
355 for (i = start; i < end; i++) {
356 if (pacl->a_entries[i].e_id
357 > pacl->a_entries[i+1].e_id) {
359 tmp = pacl->a_entries[i];
360 pacl->a_entries[i] = pacl->a_entries[i+1];
361 pacl->a_entries[i+1] = tmp;
368 sort_pacl(struct posix_acl *pacl)
370 /* posix_acl_valid requires that users and groups be in order
374 if (pacl->a_count <= 4)
375 return; /* no users or groups */
377 while (pacl->a_entries[i].e_tag == ACL_USER)
379 sort_pacl_range(pacl, 1, i-1);
381 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
383 while (pacl->a_entries[j].e_tag == ACL_GROUP)
385 sort_pacl_range(pacl, i, j-1);
390 * While processing the NFSv4 ACE, this maintains bitmasks representing
391 * which permission bits have been allowed and which denied to a given
393 struct posix_ace_state {
398 struct posix_user_ace_state {
400 struct posix_ace_state perms;
403 struct posix_ace_state_array {
405 struct posix_user_ace_state aces[];
409 * While processing the NFSv4 ACE, this maintains the partial permissions
410 * calculated so far: */
412 struct posix_acl_state {
414 struct posix_ace_state owner;
415 struct posix_ace_state group;
416 struct posix_ace_state other;
417 struct posix_ace_state everyone;
418 struct posix_ace_state mask; /* Deny unused in this case */
419 struct posix_ace_state_array *users;
420 struct posix_ace_state_array *groups;
424 init_state(struct posix_acl_state *state, int cnt)
428 memset(state, 0, sizeof(struct posix_acl_state));
431 * In the worst case, each individual acl could be for a distinct
432 * named user or group, but we don't no which, so we allocate
433 * enough space for either:
435 alloc = sizeof(struct posix_ace_state_array)
436 + cnt*sizeof(struct posix_user_ace_state);
437 state->users = kzalloc(alloc, GFP_KERNEL);
440 state->groups = kzalloc(alloc, GFP_KERNEL);
441 if (!state->groups) {
449 free_state(struct posix_acl_state *state) {
451 kfree(state->groups);
454 static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
456 state->mask.allow |= astate->allow;
460 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
461 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
462 * to traditional read/write/execute permissions.
464 * It's problematic to reject acls that use certain mode bits, because it
465 * places the burden on users to learn the rules about which bits one
466 * particular server sets, without giving the user a lot of help--we return an
467 * error that could mean any number of different things. To make matters
468 * worse, the problematic bits might be introduced by some application that's
469 * automatically mapping from some other acl model.
471 * So wherever possible we accept anything, possibly erring on the side of
472 * denying more permissions than necessary.
474 * However we do reject *explicit* DENY's of a few bits representing
475 * permissions we could never deny:
478 static inline int check_deny(u32 mask, int isowner)
480 if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
484 if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
489 static struct posix_acl *
490 posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
492 struct posix_acl_entry *pace;
493 struct posix_acl *pacl;
498 * ACLs with no ACEs are treated differently in the inheritable
499 * and effective cases: when there are no inheritable ACEs, we
500 * set a zero-length default posix acl:
502 if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) {
503 pacl = posix_acl_alloc(0, GFP_KERNEL);
504 return pacl ? pacl : ERR_PTR(-ENOMEM);
507 * When there are no effective ACEs, the following will end
508 * up setting a 3-element effective posix ACL with all
511 nace = 4 + state->users->n + state->groups->n;
512 pacl = posix_acl_alloc(nace, GFP_KERNEL);
514 return ERR_PTR(-ENOMEM);
516 pace = pacl->a_entries;
517 pace->e_tag = ACL_USER_OBJ;
518 error = check_deny(state->owner.deny, 1);
521 low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags);
522 pace->e_id = ACL_UNDEFINED_ID;
524 for (i=0; i < state->users->n; i++) {
526 pace->e_tag = ACL_USER;
527 error = check_deny(state->users->aces[i].perms.deny, 0);
530 low_mode_from_nfs4(state->users->aces[i].perms.allow,
531 &pace->e_perm, flags);
532 pace->e_id = state->users->aces[i].uid;
533 add_to_mask(state, &state->users->aces[i].perms);
537 pace->e_tag = ACL_GROUP_OBJ;
538 error = check_deny(state->group.deny, 0);
541 low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags);
542 pace->e_id = ACL_UNDEFINED_ID;
543 add_to_mask(state, &state->group);
545 for (i=0; i < state->groups->n; i++) {
547 pace->e_tag = ACL_GROUP;
548 error = check_deny(state->groups->aces[i].perms.deny, 0);
551 low_mode_from_nfs4(state->groups->aces[i].perms.allow,
552 &pace->e_perm, flags);
553 pace->e_id = state->groups->aces[i].uid;
554 add_to_mask(state, &state->groups->aces[i].perms);
558 pace->e_tag = ACL_MASK;
559 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
560 pace->e_id = ACL_UNDEFINED_ID;
563 pace->e_tag = ACL_OTHER;
564 error = check_deny(state->other.deny, 0);
567 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
568 pace->e_id = ACL_UNDEFINED_ID;
572 posix_acl_release(pacl);
573 return ERR_PTR(error);
576 static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
578 /* Allow all bits in the mask not already denied: */
579 astate->allow |= mask & ~astate->deny;
582 static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
584 /* Deny all bits in the mask not already allowed: */
585 astate->deny |= mask & ~astate->allow;
588 static int find_uid(struct posix_acl_state *state, struct posix_ace_state_array *a, uid_t uid)
592 for (i = 0; i < a->n; i++)
593 if (a->aces[i].uid == uid)
597 a->aces[i].uid = uid;
598 a->aces[i].perms.allow = state->everyone.allow;
599 a->aces[i].perms.deny = state->everyone.deny;
604 static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
608 for (i=0; i < a->n; i++)
609 deny_bits(&a->aces[i].perms, mask);
612 static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
616 for (i=0; i < a->n; i++)
617 allow_bits(&a->aces[i].perms, mask);
620 static void process_one_v4_ace(struct posix_acl_state *state,
621 struct nfs4_ace *ace)
623 u32 mask = ace->access_mask;
628 switch (ace2type(ace)) {
630 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
631 allow_bits(&state->owner, mask);
633 deny_bits(&state->owner, mask);
637 i = find_uid(state, state->users, ace->who);
638 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
639 allow_bits(&state->users->aces[i].perms, mask);
641 deny_bits(&state->users->aces[i].perms, mask);
642 mask = state->users->aces[i].perms.deny;
643 deny_bits(&state->owner, mask);
647 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
648 allow_bits(&state->group, mask);
650 deny_bits(&state->group, mask);
651 mask = state->group.deny;
652 deny_bits(&state->owner, mask);
653 deny_bits(&state->everyone, mask);
654 deny_bits_array(state->users, mask);
655 deny_bits_array(state->groups, mask);
659 i = find_uid(state, state->groups, ace->who);
660 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
661 allow_bits(&state->groups->aces[i].perms, mask);
663 deny_bits(&state->groups->aces[i].perms, mask);
664 mask = state->groups->aces[i].perms.deny;
665 deny_bits(&state->owner, mask);
666 deny_bits(&state->group, mask);
667 deny_bits(&state->everyone, mask);
668 deny_bits_array(state->users, mask);
669 deny_bits_array(state->groups, mask);
673 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
674 allow_bits(&state->owner, mask);
675 allow_bits(&state->group, mask);
676 allow_bits(&state->other, mask);
677 allow_bits(&state->everyone, mask);
678 allow_bits_array(state->users, mask);
679 allow_bits_array(state->groups, mask);
681 deny_bits(&state->owner, mask);
682 deny_bits(&state->group, mask);
683 deny_bits(&state->other, mask);
684 deny_bits(&state->everyone, mask);
685 deny_bits_array(state->users, mask);
686 deny_bits_array(state->groups, mask);
691 int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
692 struct posix_acl **dpacl, unsigned int flags)
694 struct posix_acl_state effective_acl_state, default_acl_state;
695 struct nfs4_ace *ace;
698 ret = init_state(&effective_acl_state, acl->naces);
701 ret = init_state(&default_acl_state, acl->naces);
705 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
706 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
707 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
709 if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
711 if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
712 process_one_v4_ace(&effective_acl_state, ace);
715 if (!(flags & NFS4_ACL_DIR))
718 * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
719 * is set, we're effectively turning on the other. That's OK,
720 * according to rfc 3530.
722 process_one_v4_ace(&default_acl_state, ace);
724 if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
725 process_one_v4_ace(&effective_acl_state, ace);
727 *pacl = posix_state_to_acl(&effective_acl_state, flags);
729 ret = PTR_ERR(*pacl);
733 *dpacl = posix_state_to_acl(&default_acl_state,
734 flags | NFS4_ACL_TYPE_DEFAULT);
735 if (IS_ERR(*dpacl)) {
736 ret = PTR_ERR(*dpacl);
738 posix_acl_release(*pacl);
746 free_state(&default_acl_state);
748 free_state(&effective_acl_state);
753 ace2type(struct nfs4_ace *ace)
755 switch (ace->whotype) {
756 case NFS4_ACL_WHO_NAMED:
757 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
758 ACL_GROUP : ACL_USER);
759 case NFS4_ACL_WHO_OWNER:
761 case NFS4_ACL_WHO_GROUP:
762 return ACL_GROUP_OBJ;
763 case NFS4_ACL_WHO_EVERYONE:
770 EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4);
771 EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix);
776 struct nfs4_acl *acl;
778 acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL);
792 .stringlen = sizeof("OWNER@") - 1,
793 .type = NFS4_ACL_WHO_OWNER,
797 .stringlen = sizeof("GROUP@") - 1,
798 .type = NFS4_ACL_WHO_GROUP,
801 .string = "EVERYONE@",
802 .stringlen = sizeof("EVERYONE@") - 1,
803 .type = NFS4_ACL_WHO_EVERYONE,
808 nfs4_acl_get_whotype(char *p, u32 len)
812 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
813 if (s2t_map[i].stringlen == len &&
814 0 == memcmp(s2t_map[i].string, p, len))
815 return s2t_map[i].type;
817 return NFS4_ACL_WHO_NAMED;
821 nfs4_acl_write_who(int who, char *p)
825 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
826 if (s2t_map[i].type == who) {
827 memcpy(p, s2t_map[i].string, s2t_map[i].stringlen);
828 return s2t_map[i].stringlen;
835 EXPORT_SYMBOL(nfs4_acl_new);
836 EXPORT_SYMBOL(nfs4_acl_get_whotype);
837 EXPORT_SYMBOL(nfs4_acl_write_who);