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 | NFS4_ACE_INHERIT_ONLY_ACE)
66 #define MASK_EQUAL(mask1, mask2) \
67 ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
70 mask_from_posix(unsigned short perm, unsigned int flags)
72 int mask = NFS4_ANYONE_MODE;
74 if (flags & NFS4_ACL_OWNER)
75 mask |= NFS4_OWNER_MODE;
77 mask |= NFS4_READ_MODE;
79 mask |= NFS4_WRITE_MODE;
80 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
81 mask |= NFS4_ACE_DELETE_CHILD;
82 if (perm & ACL_EXECUTE)
83 mask |= NFS4_EXECUTE_MODE;
88 deny_mask(u32 allow_mask, unsigned int flags)
90 u32 ret = ~allow_mask & ~NFS4_MASK_UNSUPP;
91 if (!(flags & NFS4_ACL_DIR))
92 ret &= ~NFS4_ACE_DELETE_CHILD;
96 /* XXX: modify functions to return NFS errors; they're only ever
97 * used by nfs code, after all.... */
99 /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
100 * side of being more restrictive, so the mode bit mapping below is
101 * pessimistic. An optimistic version would be needed to handle DENY's,
102 * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
106 low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
108 u32 write_mode = NFS4_WRITE_MODE;
110 if (flags & NFS4_ACL_DIR)
111 write_mode |= NFS4_ACE_DELETE_CHILD;
113 if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
115 if ((perm & write_mode) == write_mode)
117 if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
118 *mode |= ACL_EXECUTE;
121 struct ace_container {
122 struct nfs4_ace *ace;
123 struct list_head ace_l;
126 static short ace2type(struct nfs4_ace *);
127 static int _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, unsigned int);
128 static struct posix_acl *_nfsv4_to_posix_one(struct nfs4_acl *, unsigned int);
129 int nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);
130 static int nfs4_acl_split(struct nfs4_acl *, struct nfs4_acl *);
133 nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
136 struct nfs4_acl *acl;
140 (posix_acl_valid(pacl) < 0 || pacl->a_count == 0)) ||
142 (posix_acl_valid(dpacl) < 0 || dpacl->a_count == 0)))
145 acl = nfs4_acl_new();
152 error = _posix_to_nfsv4_one(pacl, acl,
153 flags & ~NFS4_ACL_TYPE_DEFAULT);
159 error = _posix_to_nfsv4_one(dpacl, acl,
160 flags | NFS4_ACL_TYPE_DEFAULT);
170 acl = ERR_PTR(error);
176 nfs4_acl_add_pair(struct nfs4_acl *acl, int eflag, u32 mask, int whotype,
177 uid_t owner, unsigned int flags)
181 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
182 eflag, mask, whotype, owner);
185 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
186 eflag, deny_mask(mask, flags), whotype, owner);
190 /* We assume the acl has been verified with posix_acl_valid. */
192 _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
195 struct posix_acl_entry *pa, *pe, *group_owner_entry;
198 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
199 NFS4_INHERITANCE_FLAGS : 0);
201 BUG_ON(pacl->a_count < 3);
202 pe = pacl->a_entries + pacl->a_count;
203 pa = pe - 2; /* if mask entry exists, it's second from the last. */
204 if (pa->e_tag == ACL_MASK)
205 mask_mask = deny_mask(mask_from_posix(pa->e_perm, flags), flags);
209 pa = pacl->a_entries;
210 BUG_ON(pa->e_tag != ACL_USER_OBJ);
211 mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
212 error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags);
217 while (pa->e_tag == ACL_USER) {
218 mask = mask_from_posix(pa->e_perm, flags);
219 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
220 eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id);
225 error = nfs4_acl_add_pair(acl, eflag, mask,
226 NFS4_ACL_WHO_NAMED, pa->e_id, flags);
232 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
233 * since a user can be in more than one group. */
237 if (pacl->a_count > 3) {
238 BUG_ON(pa->e_tag != ACL_GROUP_OBJ);
239 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
240 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
241 NFS4_ACL_WHO_GROUP, 0);
245 group_owner_entry = pa;
246 mask = mask_from_posix(pa->e_perm, flags);
247 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
248 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
249 NFS4_ACL_WHO_GROUP, 0);
254 while (pa->e_tag == ACL_GROUP) {
255 mask = mask_from_posix(pa->e_perm, flags);
256 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
257 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
258 NFS4_ACL_WHO_NAMED, pa->e_id);
262 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
263 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
264 NFS4_ACL_WHO_NAMED, pa->e_id);
272 pa = group_owner_entry;
273 mask = mask_from_posix(pa->e_perm, flags);
274 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
275 NFS4_ACE_IDENTIFIER_GROUP | eflag,
276 deny_mask(mask, flags), NFS4_ACL_WHO_GROUP, 0);
280 while (pa->e_tag == ACL_GROUP) {
281 mask = mask_from_posix(pa->e_perm, flags);
282 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
283 NFS4_ACE_IDENTIFIER_GROUP | eflag,
284 deny_mask(mask, flags), NFS4_ACL_WHO_NAMED, pa->e_id);
290 if (pa->e_tag == ACL_MASK)
292 BUG_ON(pa->e_tag != ACL_OTHER);
293 mask = mask_from_posix(pa->e_perm, flags);
294 error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags);
301 sort_pacl_range(struct posix_acl *pacl, int start, int end) {
303 struct posix_acl_entry tmp;
305 /* We just do a bubble sort; easy to do in place, and we're not
306 * expecting acl's to be long enough to justify anything more. */
309 for (i = start; i < end; i++) {
310 if (pacl->a_entries[i].e_id
311 > pacl->a_entries[i+1].e_id) {
313 tmp = pacl->a_entries[i];
314 pacl->a_entries[i] = pacl->a_entries[i+1];
315 pacl->a_entries[i+1] = tmp;
322 sort_pacl(struct posix_acl *pacl)
324 /* posix_acl_valid requires that users and groups be in order
328 if (pacl->a_count <= 4)
329 return; /* no users or groups */
331 while (pacl->a_entries[i].e_tag == ACL_USER)
333 sort_pacl_range(pacl, 1, i-1);
335 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
337 while (pacl->a_entries[j].e_tag == ACL_GROUP)
339 sort_pacl_range(pacl, i, j-1);
344 nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
345 struct posix_acl **dpacl, unsigned int flags)
347 struct nfs4_acl *dacl;
353 dacl = nfs4_acl_new();
357 error = nfs4_acl_split(acl, dacl);
362 if (acl->naces == 0) {
367 *pacl = _nfsv4_to_posix_one(acl, flags);
369 error = PTR_ERR(*pacl);
377 if (dacl->naces == 0) {
378 if (pacl == NULL || *pacl == NULL)
384 *dpacl = _nfsv4_to_posix_one(dacl, flags);
385 if (IS_ERR(*dpacl)) {
386 error = PTR_ERR(*dpacl);
394 posix_acl_release(*pacl);
403 * While processing the NFSv4 ACE, this maintains bitmasks representing
404 * which permission bits have been allowed and which denied to a given
406 struct posix_ace_state {
411 struct posix_user_ace_state {
413 struct posix_ace_state perms;
416 struct posix_ace_state_array {
418 struct posix_user_ace_state aces[];
422 * While processing the NFSv4 ACE, this maintains the partial permissions
423 * calculated so far: */
425 struct posix_acl_state {
426 struct posix_ace_state owner;
427 struct posix_ace_state group;
428 struct posix_ace_state other;
429 struct posix_ace_state everyone;
430 struct posix_ace_state mask; /* Deny unused in this case */
431 struct posix_ace_state_array *users;
432 struct posix_ace_state_array *groups;
436 init_state(struct posix_acl_state *state, int cnt)
440 memset(state, 0, sizeof(struct posix_acl_state));
442 * In the worst case, each individual acl could be for a distinct
443 * named user or group, but we don't no which, so we allocate
444 * enough space for either:
446 alloc = sizeof(struct posix_ace_state_array)
447 + cnt*sizeof(struct posix_ace_state);
448 state->users = kzalloc(alloc, GFP_KERNEL);
451 state->groups = kzalloc(alloc, GFP_KERNEL);
452 if (!state->groups) {
460 free_state(struct posix_acl_state *state) {
462 kfree(state->groups);
465 static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
467 state->mask.allow |= astate->allow;
471 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
472 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
473 * to traditional read/write/execute permissions.
475 * It's problematic to reject acls that use certain mode bits, because it
476 * places the burden on users to learn the rules about which bits one
477 * particular server sets, without giving the user a lot of help--we return an
478 * error that could mean any number of different things. To make matters
479 * worse, the problematic bits might be introduced by some application that's
480 * automatically mapping from some other acl model.
482 * So wherever possible we accept anything, possibly erring on the side of
483 * denying more permissions than necessary.
485 * However we do reject *explicit* DENY's of a few bits representing
486 * permissions we could never deny:
489 static inline int check_deny(u32 mask, int isowner)
491 if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
495 if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
500 static struct posix_acl *
501 posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
503 struct posix_acl_entry *pace;
504 struct posix_acl *pacl;
508 nace = 4 + state->users->n + state->groups->n;
509 pacl = posix_acl_alloc(nace, GFP_KERNEL);
511 return ERR_PTR(-ENOMEM);
513 pace = pacl->a_entries;
514 pace->e_tag = ACL_USER_OBJ;
515 error = check_deny(state->owner.deny, 1);
518 low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags);
519 pace->e_id = ACL_UNDEFINED_ID;
521 for (i=0; i < state->users->n; i++) {
523 pace->e_tag = ACL_USER;
524 error = check_deny(state->users->aces[i].perms.deny, 0);
527 low_mode_from_nfs4(state->users->aces[i].perms.allow,
528 &pace->e_perm, flags);
529 pace->e_id = state->users->aces[i].uid;
530 add_to_mask(state, &state->users->aces[i].perms);
534 pace->e_tag = ACL_GROUP_OBJ;
535 error = check_deny(state->group.deny, 0);
538 low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags);
539 pace->e_id = ACL_UNDEFINED_ID;
540 add_to_mask(state, &state->group);
542 for (i=0; i < state->groups->n; i++) {
544 pace->e_tag = ACL_GROUP;
545 error = check_deny(state->groups->aces[i].perms.deny, 0);
548 low_mode_from_nfs4(state->groups->aces[i].perms.allow,
549 &pace->e_perm, flags);
550 pace->e_id = state->groups->aces[i].uid;
551 add_to_mask(state, &state->groups->aces[i].perms);
555 pace->e_tag = ACL_MASK;
556 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
557 pace->e_id = ACL_UNDEFINED_ID;
560 pace->e_tag = ACL_OTHER;
561 error = check_deny(state->other.deny, 0);
564 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
565 pace->e_id = ACL_UNDEFINED_ID;
569 posix_acl_release(pacl);
570 return ERR_PTR(error);
573 static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
575 /* Allow all bits in the mask not already denied: */
576 astate->allow |= mask & ~astate->deny;
579 static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
581 /* Deny all bits in the mask not already allowed: */
582 astate->deny |= mask & ~astate->allow;
585 static int find_uid(struct posix_acl_state *state, struct posix_ace_state_array *a, uid_t uid)
589 for (i = 0; i < a->n; i++)
590 if (a->aces[i].uid == uid)
594 a->aces[i].uid = uid;
595 a->aces[i].perms.allow = state->everyone.allow;
596 a->aces[i].perms.deny = state->everyone.deny;
601 static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
605 for (i=0; i < a->n; i++)
606 deny_bits(&a->aces[i].perms, mask);
609 static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
613 for (i=0; i < a->n; i++)
614 allow_bits(&a->aces[i].perms, mask);
617 static void process_one_v4_ace(struct posix_acl_state *state,
618 struct nfs4_ace *ace)
620 u32 mask = ace->access_mask;
623 switch (ace2type(ace)) {
625 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
626 allow_bits(&state->owner, mask);
628 deny_bits(&state->owner, mask);
632 i = find_uid(state, state->users, ace->who);
633 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
634 allow_bits(&state->users->aces[i].perms, mask);
636 deny_bits(&state->users->aces[i].perms, mask);
637 mask = state->users->aces[i].perms.deny;
638 deny_bits(&state->owner, mask);
642 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
643 allow_bits(&state->group, mask);
645 deny_bits(&state->group, mask);
646 mask = state->group.deny;
647 deny_bits(&state->owner, mask);
648 deny_bits(&state->everyone, mask);
649 deny_bits_array(state->users, mask);
650 deny_bits_array(state->groups, mask);
654 i = find_uid(state, state->groups, ace->who);
655 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
656 allow_bits(&state->groups->aces[i].perms, mask);
658 deny_bits(&state->groups->aces[i].perms, mask);
659 mask = state->groups->aces[i].perms.deny;
660 deny_bits(&state->owner, mask);
661 deny_bits(&state->group, mask);
662 deny_bits(&state->everyone, mask);
663 deny_bits_array(state->users, mask);
664 deny_bits_array(state->groups, mask);
668 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
669 allow_bits(&state->owner, mask);
670 allow_bits(&state->group, mask);
671 allow_bits(&state->other, mask);
672 allow_bits(&state->everyone, mask);
673 allow_bits_array(state->users, mask);
674 allow_bits_array(state->groups, mask);
676 deny_bits(&state->owner, mask);
677 deny_bits(&state->group, mask);
678 deny_bits(&state->other, mask);
679 deny_bits(&state->everyone, mask);
680 deny_bits_array(state->users, mask);
681 deny_bits_array(state->groups, mask);
686 static struct posix_acl *
687 _nfsv4_to_posix_one(struct nfs4_acl *n4acl, unsigned int flags)
689 struct posix_acl_state state;
690 struct posix_acl *pacl;
691 struct nfs4_ace *ace;
694 ret = init_state(&state, n4acl->naces);
698 list_for_each_entry(ace, &n4acl->ace_head, l_ace)
699 process_one_v4_ace(&state, ace);
701 pacl = posix_state_to_acl(&state, flags);
711 nfs4_acl_split(struct nfs4_acl *acl, struct nfs4_acl *dacl)
713 struct list_head *h, *n;
714 struct nfs4_ace *ace;
717 list_for_each_safe(h, n, &acl->ace_head) {
718 ace = list_entry(h, struct nfs4_ace, l_ace);
720 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
721 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
724 if ((ace->flag & NFS4_INHERITANCE_FLAGS)
725 != NFS4_INHERITANCE_FLAGS)
728 error = nfs4_acl_add_ace(dacl, ace->type, ace->flag,
729 ace->access_mask, ace->whotype, ace->who);
743 ace2type(struct nfs4_ace *ace)
745 switch (ace->whotype) {
746 case NFS4_ACL_WHO_NAMED:
747 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
748 ACL_GROUP : ACL_USER);
749 case NFS4_ACL_WHO_OWNER:
751 case NFS4_ACL_WHO_GROUP:
752 return ACL_GROUP_OBJ;
753 case NFS4_ACL_WHO_EVERYONE:
760 EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4);
761 EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix);
766 struct nfs4_acl *acl;
768 if ((acl = kmalloc(sizeof(*acl), GFP_KERNEL)) == NULL)
772 INIT_LIST_HEAD(&acl->ace_head);
778 nfs4_acl_free(struct nfs4_acl *acl)
781 struct nfs4_ace *ace;
786 while (!list_empty(&acl->ace_head)) {
787 h = acl->ace_head.next;
789 ace = list_entry(h, struct nfs4_ace, l_ace);
799 nfs4_acl_add_ace(struct nfs4_acl *acl, u32 type, u32 flag, u32 access_mask,
800 int whotype, uid_t who)
802 struct nfs4_ace *ace;
804 if ((ace = kmalloc(sizeof(*ace), GFP_KERNEL)) == NULL)
809 ace->access_mask = access_mask;
810 ace->whotype = whotype;
813 list_add_tail(&ace->l_ace, &acl->ace_head);
826 .stringlen = sizeof("OWNER@") - 1,
827 .type = NFS4_ACL_WHO_OWNER,
831 .stringlen = sizeof("GROUP@") - 1,
832 .type = NFS4_ACL_WHO_GROUP,
835 .string = "EVERYONE@",
836 .stringlen = sizeof("EVERYONE@") - 1,
837 .type = NFS4_ACL_WHO_EVERYONE,
842 nfs4_acl_get_whotype(char *p, u32 len)
846 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
847 if (s2t_map[i].stringlen == len &&
848 0 == memcmp(s2t_map[i].string, p, len))
849 return s2t_map[i].type;
851 return NFS4_ACL_WHO_NAMED;
855 nfs4_acl_write_who(int who, char *p)
859 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
860 if (s2t_map[i].type == who) {
861 memcpy(p, s2t_map[i].string, s2t_map[i].stringlen);
862 return s2t_map[i].stringlen;
869 EXPORT_SYMBOL(nfs4_acl_new);
870 EXPORT_SYMBOL(nfs4_acl_free);
871 EXPORT_SYMBOL(nfs4_acl_add_ace);
872 EXPORT_SYMBOL(nfs4_acl_get_whotype);
873 EXPORT_SYMBOL(nfs4_acl_write_who);