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);
154 /* allocate for worst case: one (deny, allow) pair each: */
155 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;
167 *acl = nfs4_acl_new(size);
174 _posix_to_nfsv4_one(pacl, *acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
177 _posix_to_nfsv4_one(dpacl, *acl, flags | NFS4_ACL_TYPE_DEFAULT);
180 posix_acl_release(pacl);
181 posix_acl_release(dpacl);
185 struct posix_acl_summary {
186 unsigned short owner;
187 unsigned short users;
188 unsigned short group;
189 unsigned short groups;
190 unsigned short other;
195 summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas)
197 struct posix_acl_entry *pa, *pe;
200 * Only pas.users and pas.groups need initialization; previous
201 * posix_acl_valid() calls ensure that the other fields will be
202 * initialized in the following loop. But, just to placate gcc:
204 memset(pas, 0, sizeof(*pas));
207 pe = acl->a_entries + acl->a_count;
209 FOREACH_ACL_ENTRY(pa, acl, pe) {
212 pas->owner = pa->e_perm;
215 pas->group = pa->e_perm;
218 pas->users |= pa->e_perm;
221 pas->groups |= pa->e_perm;
224 pas->other = pa->e_perm;
227 pas->mask = pa->e_perm;
231 /* We'll only care about effective permissions: */
232 pas->users &= pas->mask;
233 pas->group &= pas->mask;
234 pas->groups &= pas->mask;
237 /* We assume the acl has been verified with posix_acl_valid. */
239 _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
242 struct posix_acl_entry *pa, *group_owner_entry;
243 struct nfs4_ace *ace;
244 struct posix_acl_summary pas;
246 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
247 NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0);
249 BUG_ON(pacl->a_count < 3);
250 summarize_posix_acl(pacl, &pas);
252 pa = pacl->a_entries;
253 ace = acl->aces + acl->naces;
255 /* We could deny everything not granted by the owner: */
258 * but it is equivalent (and simpler) to deny only what is not
259 * granted by later entries:
261 deny &= pas.users | pas.group | pas.groups | pas.other;
263 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
265 ace->access_mask = deny_mask_from_posix(deny, flags);
266 ace->whotype = NFS4_ACL_WHO_OWNER;
271 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
273 ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
274 ace->whotype = NFS4_ACL_WHO_OWNER;
279 while (pa->e_tag == ACL_USER) {
280 deny = ~(pa->e_perm & pas.mask);
281 deny &= pas.groups | pas.group | pas.other;
283 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
285 ace->access_mask = deny_mask_from_posix(deny, flags);
286 ace->whotype = NFS4_ACL_WHO_NAMED;
287 ace->who_uid = pa->e_uid;
291 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
293 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
295 ace->whotype = NFS4_ACL_WHO_NAMED;
296 ace->who_uid = pa->e_uid;
302 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
303 * since a user can be in more than one group. */
307 group_owner_entry = pa;
309 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
311 ace->access_mask = mask_from_posix(pas.group, flags);
312 ace->whotype = NFS4_ACL_WHO_GROUP;
317 while (pa->e_tag == ACL_GROUP) {
318 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
319 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
320 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
322 ace->whotype = NFS4_ACL_WHO_NAMED;
323 ace->who_gid = pa->e_gid;
331 pa = group_owner_entry;
333 deny = ~pas.group & pas.other;
335 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
337 ace->access_mask = deny_mask_from_posix(deny, flags);
338 ace->whotype = NFS4_ACL_WHO_GROUP;
344 while (pa->e_tag == ACL_GROUP) {
345 deny = ~(pa->e_perm & pas.mask);
348 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
349 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
350 ace->access_mask = deny_mask_from_posix(deny, flags);
351 ace->whotype = NFS4_ACL_WHO_NAMED;
352 ace->who_gid = pa->e_gid;
359 if (pa->e_tag == ACL_MASK)
361 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
363 ace->access_mask = mask_from_posix(pa->e_perm, flags);
364 ace->whotype = NFS4_ACL_WHO_EVERYONE;
369 pace_gt(struct posix_acl_entry *pace1, struct posix_acl_entry *pace2)
371 if (pace1->e_tag != pace2->e_tag)
372 return pace1->e_tag > pace2->e_tag;
373 if (pace1->e_tag == ACL_USER)
374 return uid_gt(pace1->e_uid, pace2->e_uid);
375 if (pace1->e_tag == ACL_GROUP)
376 return gid_gt(pace1->e_gid, pace2->e_gid);
381 sort_pacl_range(struct posix_acl *pacl, int start, int end) {
383 struct posix_acl_entry tmp;
385 /* We just do a bubble sort; easy to do in place, and we're not
386 * expecting acl's to be long enough to justify anything more. */
389 for (i = start; i < end; i++) {
390 if (pace_gt(&pacl->a_entries[i],
391 &pacl->a_entries[i+1])) {
393 tmp = pacl->a_entries[i];
394 pacl->a_entries[i] = pacl->a_entries[i+1];
395 pacl->a_entries[i+1] = tmp;
402 sort_pacl(struct posix_acl *pacl)
404 /* posix_acl_valid requires that users and groups be in order
408 if (pacl->a_count <= 4)
409 return; /* no users or groups */
411 while (pacl->a_entries[i].e_tag == ACL_USER)
413 sort_pacl_range(pacl, 1, i-1);
415 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
417 while (pacl->a_entries[j].e_tag == ACL_GROUP)
419 sort_pacl_range(pacl, i, j-1);
424 * While processing the NFSv4 ACE, this maintains bitmasks representing
425 * which permission bits have been allowed and which denied to a given
427 struct posix_ace_state {
432 struct posix_user_ace_state {
437 struct posix_ace_state perms;
440 struct posix_ace_state_array {
442 struct posix_user_ace_state aces[];
446 * While processing the NFSv4 ACE, this maintains the partial permissions
447 * calculated so far: */
449 struct posix_acl_state {
451 struct posix_ace_state owner;
452 struct posix_ace_state group;
453 struct posix_ace_state other;
454 struct posix_ace_state everyone;
455 struct posix_ace_state mask; /* Deny unused in this case */
456 struct posix_ace_state_array *users;
457 struct posix_ace_state_array *groups;
461 init_state(struct posix_acl_state *state, int cnt)
465 memset(state, 0, sizeof(struct posix_acl_state));
468 * In the worst case, each individual acl could be for a distinct
469 * named user or group, but we don't no which, so we allocate
470 * enough space for either:
472 alloc = sizeof(struct posix_ace_state_array)
473 + cnt*sizeof(struct posix_user_ace_state);
474 state->users = kzalloc(alloc, GFP_KERNEL);
477 state->groups = kzalloc(alloc, GFP_KERNEL);
478 if (!state->groups) {
486 free_state(struct posix_acl_state *state) {
488 kfree(state->groups);
491 static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
493 state->mask.allow |= astate->allow;
497 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
498 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
499 * to traditional read/write/execute permissions.
501 * It's problematic to reject acls that use certain mode bits, because it
502 * places the burden on users to learn the rules about which bits one
503 * particular server sets, without giving the user a lot of help--we return an
504 * error that could mean any number of different things. To make matters
505 * worse, the problematic bits might be introduced by some application that's
506 * automatically mapping from some other acl model.
508 * So wherever possible we accept anything, possibly erring on the side of
509 * denying more permissions than necessary.
511 * However we do reject *explicit* DENY's of a few bits representing
512 * permissions we could never deny:
515 static inline int check_deny(u32 mask, int isowner)
517 if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
521 if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
526 static struct posix_acl *
527 posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
529 struct posix_acl_entry *pace;
530 struct posix_acl *pacl;
535 * ACLs with no ACEs are treated differently in the inheritable
536 * and effective cases: when there are no inheritable ACEs, we
537 * set a zero-length default posix acl:
539 if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) {
540 pacl = posix_acl_alloc(0, GFP_KERNEL);
541 return pacl ? pacl : ERR_PTR(-ENOMEM);
544 * When there are no effective ACEs, the following will end
545 * up setting a 3-element effective posix ACL with all
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);
593 pace->e_tag = ACL_MASK;
594 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
597 pace->e_tag = ACL_OTHER;
598 error = check_deny(state->other.deny, 0);
601 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
605 posix_acl_release(pacl);
606 return ERR_PTR(error);
609 static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
611 /* Allow all bits in the mask not already denied: */
612 astate->allow |= mask & ~astate->deny;
615 static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
617 /* Deny all bits in the mask not already allowed: */
618 astate->deny |= mask & ~astate->allow;
621 static int find_uid(struct posix_acl_state *state, kuid_t uid)
623 struct posix_ace_state_array *a = state->users;
626 for (i = 0; i < a->n; i++)
627 if (uid_eq(a->aces[i].uid, uid))
631 a->aces[i].uid = uid;
632 a->aces[i].perms.allow = state->everyone.allow;
633 a->aces[i].perms.deny = state->everyone.deny;
638 static int find_gid(struct posix_acl_state *state, kgid_t gid)
640 struct posix_ace_state_array *a = state->groups;
643 for (i = 0; i < a->n; i++)
644 if (gid_eq(a->aces[i].gid, gid))
648 a->aces[i].gid = gid;
649 a->aces[i].perms.allow = state->everyone.allow;
650 a->aces[i].perms.deny = state->everyone.deny;
655 static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
659 for (i=0; i < a->n; i++)
660 deny_bits(&a->aces[i].perms, mask);
663 static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
667 for (i=0; i < a->n; i++)
668 allow_bits(&a->aces[i].perms, mask);
671 static void process_one_v4_ace(struct posix_acl_state *state,
672 struct nfs4_ace *ace)
674 u32 mask = ace->access_mask;
679 switch (ace2type(ace)) {
681 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
682 allow_bits(&state->owner, mask);
684 deny_bits(&state->owner, mask);
688 i = find_uid(state, ace->who_uid);
689 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
690 allow_bits(&state->users->aces[i].perms, mask);
692 deny_bits(&state->users->aces[i].perms, mask);
693 mask = state->users->aces[i].perms.deny;
694 deny_bits(&state->owner, mask);
698 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
699 allow_bits(&state->group, mask);
701 deny_bits(&state->group, mask);
702 mask = state->group.deny;
703 deny_bits(&state->owner, mask);
704 deny_bits(&state->everyone, mask);
705 deny_bits_array(state->users, mask);
706 deny_bits_array(state->groups, mask);
710 i = find_gid(state, ace->who_gid);
711 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
712 allow_bits(&state->groups->aces[i].perms, mask);
714 deny_bits(&state->groups->aces[i].perms, mask);
715 mask = state->groups->aces[i].perms.deny;
716 deny_bits(&state->owner, mask);
717 deny_bits(&state->group, mask);
718 deny_bits(&state->everyone, mask);
719 deny_bits_array(state->users, mask);
720 deny_bits_array(state->groups, mask);
724 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
725 allow_bits(&state->owner, mask);
726 allow_bits(&state->group, mask);
727 allow_bits(&state->other, mask);
728 allow_bits(&state->everyone, mask);
729 allow_bits_array(state->users, mask);
730 allow_bits_array(state->groups, mask);
732 deny_bits(&state->owner, mask);
733 deny_bits(&state->group, mask);
734 deny_bits(&state->other, mask);
735 deny_bits(&state->everyone, mask);
736 deny_bits_array(state->users, mask);
737 deny_bits_array(state->groups, mask);
742 static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
743 struct posix_acl **pacl, struct posix_acl **dpacl,
746 struct posix_acl_state effective_acl_state, default_acl_state;
747 struct nfs4_ace *ace;
750 ret = init_state(&effective_acl_state, acl->naces);
753 ret = init_state(&default_acl_state, acl->naces);
757 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
758 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
759 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
761 if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
763 if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
764 process_one_v4_ace(&effective_acl_state, ace);
767 if (!(flags & NFS4_ACL_DIR))
770 * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
771 * is set, we're effectively turning on the other. That's OK,
772 * according to rfc 3530.
774 process_one_v4_ace(&default_acl_state, ace);
776 if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
777 process_one_v4_ace(&effective_acl_state, ace);
779 *pacl = posix_state_to_acl(&effective_acl_state, flags);
781 ret = PTR_ERR(*pacl);
785 *dpacl = posix_state_to_acl(&default_acl_state,
786 flags | NFS4_ACL_TYPE_DEFAULT);
787 if (IS_ERR(*dpacl)) {
788 ret = PTR_ERR(*dpacl);
790 posix_acl_release(*pacl);
798 free_state(&default_acl_state);
800 free_state(&effective_acl_state);
805 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
806 struct nfs4_acl *acl)
810 struct dentry *dentry;
812 struct posix_acl *pacl = NULL, *dpacl = NULL;
813 unsigned int flags = 0;
816 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR);
820 dentry = fhp->fh_dentry;
821 inode = dentry->d_inode;
823 if (!inode->i_op->set_acl || !IS_POSIXACL(inode))
824 return nfserr_attrnotsupp;
826 if (S_ISDIR(inode->i_mode))
827 flags = NFS4_ACL_DIR;
829 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
830 if (host_error == -EINVAL)
831 return nfserr_attrnotsupp;
835 host_error = inode->i_op->set_acl(inode, pacl, ACL_TYPE_ACCESS);
839 if (S_ISDIR(inode->i_mode)) {
840 host_error = inode->i_op->set_acl(inode, dpacl,
845 posix_acl_release(pacl);
846 posix_acl_release(dpacl);
848 if (host_error == -EOPNOTSUPP)
849 return nfserr_attrnotsupp;
851 return nfserrno(host_error);
856 ace2type(struct nfs4_ace *ace)
858 switch (ace->whotype) {
859 case NFS4_ACL_WHO_NAMED:
860 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
861 ACL_GROUP : ACL_USER);
862 case NFS4_ACL_WHO_OWNER:
864 case NFS4_ACL_WHO_GROUP:
865 return ACL_GROUP_OBJ;
866 case NFS4_ACL_WHO_EVERYONE:
876 struct nfs4_acl *acl;
878 acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL);
892 .stringlen = sizeof("OWNER@") - 1,
893 .type = NFS4_ACL_WHO_OWNER,
897 .stringlen = sizeof("GROUP@") - 1,
898 .type = NFS4_ACL_WHO_GROUP,
901 .string = "EVERYONE@",
902 .stringlen = sizeof("EVERYONE@") - 1,
903 .type = NFS4_ACL_WHO_EVERYONE,
908 nfs4_acl_get_whotype(char *p, u32 len)
912 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
913 if (s2t_map[i].stringlen == len &&
914 0 == memcmp(s2t_map[i].string, p, len))
915 return s2t_map[i].type;
917 return NFS4_ACL_WHO_NAMED;
920 __be32 nfs4_acl_write_who(int who, __be32 **p, int *len)
925 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
926 if (s2t_map[i].type != who)
928 bytes = 4 + (XDR_QUADLEN(s2t_map[i].stringlen) << 2);
930 return nfserr_resource;
931 *p = xdr_encode_opaque(*p, s2t_map[i].string,
932 s2t_map[i].stringlen);