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39#include <linux/string.h>
40#include <linux/slab.h>
41#include <linux/list.h>
42#include <linux/types.h>
43#include <linux/fs.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>
49
50
51
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)
57
58
59#define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \
60 | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS)
61
62
63#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
64 | NFS4_ACE_DIRECTORY_INHERIT_ACE)
65
66#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
67 | NFS4_ACE_INHERIT_ONLY_ACE \
68 | NFS4_ACE_IDENTIFIER_GROUP)
69
70#define MASK_EQUAL(mask1, mask2) \
71 ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
72
73static u32
74mask_from_posix(unsigned short perm, unsigned int flags)
75{
76 int mask = NFS4_ANYONE_MODE;
77
78 if (flags & NFS4_ACL_OWNER)
79 mask |= NFS4_OWNER_MODE;
80 if (perm & ACL_READ)
81 mask |= NFS4_READ_MODE;
82 if (perm & ACL_WRITE)
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;
88 return mask;
89}
90
91static u32
92deny_mask_from_posix(unsigned short perm, u32 flags)
93{
94 u32 mask = 0;
95
96 if (perm & ACL_READ)
97 mask |= NFS4_READ_MODE;
98 if (perm & ACL_WRITE)
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;
104 return mask;
105}
106
107
108
109
110
111
112
113
114
115
116static void
117low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
118{
119 u32 write_mode = NFS4_WRITE_MODE;
120
121 if (flags & NFS4_ACL_DIR)
122 write_mode |= NFS4_ACE_DELETE_CHILD;
123 *mode = 0;
124 if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
125 *mode |= ACL_READ;
126 if ((perm & write_mode) == write_mode)
127 *mode |= ACL_WRITE;
128 if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
129 *mode |= ACL_EXECUTE;
130}
131
132struct ace_container {
133 struct nfs4_ace *ace;
134 struct list_head ace_l;
135};
136
137static short ace2type(struct nfs4_ace *);
138static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
139 unsigned int);
140
141struct nfs4_acl *
142nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
143 unsigned int flags)
144{
145 struct nfs4_acl *acl;
146 int size = 0;
147
148 if (pacl) {
149 if (posix_acl_valid(pacl) < 0)
150 return ERR_PTR(-EINVAL);
151 size += 2*pacl->a_count;
152 }
153 if (dpacl) {
154 if (posix_acl_valid(dpacl) < 0)
155 return ERR_PTR(-EINVAL);
156 size += 2*dpacl->a_count;
157 }
158
159
160 acl = nfs4_acl_new(size);
161 if (acl == NULL)
162 return ERR_PTR(-ENOMEM);
163
164 if (pacl)
165 _posix_to_nfsv4_one(pacl, acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
166
167 if (dpacl)
168 _posix_to_nfsv4_one(dpacl, acl, flags | NFS4_ACL_TYPE_DEFAULT);
169
170 return acl;
171}
172
173struct posix_acl_summary {
174 unsigned short owner;
175 unsigned short users;
176 unsigned short group;
177 unsigned short groups;
178 unsigned short other;
179 unsigned short mask;
180};
181
182static void
183summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas)
184{
185 struct posix_acl_entry *pa, *pe;
186
187
188
189
190
191
192 memset(pas, 0, sizeof(*pas));
193 pas->mask = 07;
194
195 pe = acl->a_entries + acl->a_count;
196
197 FOREACH_ACL_ENTRY(pa, acl, pe) {
198 switch (pa->e_tag) {
199 case ACL_USER_OBJ:
200 pas->owner = pa->e_perm;
201 break;
202 case ACL_GROUP_OBJ:
203 pas->group = pa->e_perm;
204 break;
205 case ACL_USER:
206 pas->users |= pa->e_perm;
207 break;
208 case ACL_GROUP:
209 pas->groups |= pa->e_perm;
210 break;
211 case ACL_OTHER:
212 pas->other = pa->e_perm;
213 break;
214 case ACL_MASK:
215 pas->mask = pa->e_perm;
216 break;
217 }
218 }
219
220 pas->users &= pas->mask;
221 pas->group &= pas->mask;
222 pas->groups &= pas->mask;
223}
224
225
226static void
227_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
228 unsigned int flags)
229{
230 struct posix_acl_entry *pa, *group_owner_entry;
231 struct nfs4_ace *ace;
232 struct posix_acl_summary pas;
233 unsigned short deny;
234 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
235 NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0);
236
237 BUG_ON(pacl->a_count < 3);
238 summarize_posix_acl(pacl, &pas);
239
240 pa = pacl->a_entries;
241 ace = acl->aces + acl->naces;
242
243
244 deny = ~pas.owner;
245
246
247
248
249 deny &= pas.users | pas.group | pas.groups | pas.other;
250 if (deny) {
251 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
252 ace->flag = eflag;
253 ace->access_mask = deny_mask_from_posix(deny, flags);
254 ace->whotype = NFS4_ACL_WHO_OWNER;
255 ace++;
256 acl->naces++;
257 }
258
259 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
260 ace->flag = eflag;
261 ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
262 ace->whotype = NFS4_ACL_WHO_OWNER;
263 ace++;
264 acl->naces++;
265 pa++;
266
267 while (pa->e_tag == ACL_USER) {
268 deny = ~(pa->e_perm & pas.mask);
269 deny &= pas.groups | pas.group | pas.other;
270 if (deny) {
271 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
272 ace->flag = eflag;
273 ace->access_mask = deny_mask_from_posix(deny, flags);
274 ace->whotype = NFS4_ACL_WHO_NAMED;
275 ace->who = pa->e_id;
276 ace++;
277 acl->naces++;
278 }
279 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
280 ace->flag = eflag;
281 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
282 flags);
283 ace->whotype = NFS4_ACL_WHO_NAMED;
284 ace->who = pa->e_id;
285 ace++;
286 acl->naces++;
287 pa++;
288 }
289
290
291
292
293
294
295 group_owner_entry = pa;
296
297 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
298 ace->flag = eflag;
299 ace->access_mask = mask_from_posix(pas.group, flags);
300 ace->whotype = NFS4_ACL_WHO_GROUP;
301 ace++;
302 acl->naces++;
303 pa++;
304
305 while (pa->e_tag == ACL_GROUP) {
306 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
307 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
308 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
309 flags);
310 ace->whotype = NFS4_ACL_WHO_NAMED;
311 ace->who = pa->e_id;
312 ace++;
313 acl->naces++;
314 pa++;
315 }
316
317
318
319 pa = group_owner_entry;
320
321 deny = ~pas.group & pas.other;
322 if (deny) {
323 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
324 ace->flag = eflag;
325 ace->access_mask = deny_mask_from_posix(deny, flags);
326 ace->whotype = NFS4_ACL_WHO_GROUP;
327 ace++;
328 acl->naces++;
329 }
330 pa++;
331
332 while (pa->e_tag == ACL_GROUP) {
333 deny = ~(pa->e_perm & pas.mask);
334 deny &= pas.other;
335 if (deny) {
336 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
337 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
338 ace->access_mask = deny_mask_from_posix(deny, flags);
339 ace->whotype = NFS4_ACL_WHO_NAMED;
340 ace->who = pa->e_id;
341 ace++;
342 acl->naces++;
343 }
344 pa++;
345 }
346
347 if (pa->e_tag == ACL_MASK)
348 pa++;
349 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
350 ace->flag = eflag;
351 ace->access_mask = mask_from_posix(pa->e_perm, flags);
352 ace->whotype = NFS4_ACL_WHO_EVERYONE;
353 acl->naces++;
354}
355
356static void
357sort_pacl_range(struct posix_acl *pacl, int start, int end) {
358 int sorted = 0, i;
359 struct posix_acl_entry tmp;
360
361
362
363 while (!sorted) {
364 sorted = 1;
365 for (i = start; i < end; i++) {
366 if (pacl->a_entries[i].e_id
367 > pacl->a_entries[i+1].e_id) {
368 sorted = 0;
369 tmp = pacl->a_entries[i];
370 pacl->a_entries[i] = pacl->a_entries[i+1];
371 pacl->a_entries[i+1] = tmp;
372 }
373 }
374 }
375}
376
377static void
378sort_pacl(struct posix_acl *pacl)
379{
380
381
382 int i, j;
383
384 if (pacl->a_count <= 4)
385 return;
386 i = 1;
387 while (pacl->a_entries[i].e_tag == ACL_USER)
388 i++;
389 sort_pacl_range(pacl, 1, i-1);
390
391 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
392 j = i++;
393 while (pacl->a_entries[j].e_tag == ACL_GROUP)
394 j++;
395 sort_pacl_range(pacl, i, j-1);
396 return;
397}
398
399
400
401
402
403struct posix_ace_state {
404 u32 allow;
405 u32 deny;
406};
407
408struct posix_user_ace_state {
409 uid_t uid;
410 struct posix_ace_state perms;
411};
412
413struct posix_ace_state_array {
414 int n;
415 struct posix_user_ace_state aces[];
416};
417
418
419
420
421
422struct posix_acl_state {
423 int empty;
424 struct posix_ace_state owner;
425 struct posix_ace_state group;
426 struct posix_ace_state other;
427 struct posix_ace_state everyone;
428 struct posix_ace_state mask;
429 struct posix_ace_state_array *users;
430 struct posix_ace_state_array *groups;
431};
432
433static int
434init_state(struct posix_acl_state *state, int cnt)
435{
436 int alloc;
437
438 memset(state, 0, sizeof(struct posix_acl_state));
439 state->empty = 1;
440
441
442
443
444
445 alloc = sizeof(struct posix_ace_state_array)
446 + cnt*sizeof(struct posix_user_ace_state);
447 state->users = kzalloc(alloc, GFP_KERNEL);
448 if (!state->users)
449 return -ENOMEM;
450 state->groups = kzalloc(alloc, GFP_KERNEL);
451 if (!state->groups) {
452 kfree(state->users);
453 return -ENOMEM;
454 }
455 return 0;
456}
457
458static void
459free_state(struct posix_acl_state *state) {
460 kfree(state->users);
461 kfree(state->groups);
462}
463
464static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
465{
466 state->mask.allow |= astate->allow;
467}
468
469
470
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483
484
485
486
487
488static inline int check_deny(u32 mask, int isowner)
489{
490 if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
491 return -EINVAL;
492 if (!isowner)
493 return 0;
494 if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
495 return -EINVAL;
496 return 0;
497}
498
499static struct posix_acl *
500posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
501{
502 struct posix_acl_entry *pace;
503 struct posix_acl *pacl;
504 int nace;
505 int i, error = 0;
506
507
508
509
510
511
512 if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) {
513 pacl = posix_acl_alloc(0, GFP_KERNEL);
514 return pacl ? pacl : ERR_PTR(-ENOMEM);
515 }
516
517
518
519
520
521 nace = 4 + state->users->n + state->groups->n;
522 pacl = posix_acl_alloc(nace, GFP_KERNEL);
523 if (!pacl)
524 return ERR_PTR(-ENOMEM);
525
526 pace = pacl->a_entries;
527 pace->e_tag = ACL_USER_OBJ;
528 error = check_deny(state->owner.deny, 1);
529 if (error)
530 goto out_err;
531 low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags);
532 pace->e_id = ACL_UNDEFINED_ID;
533
534 for (i=0; i < state->users->n; i++) {
535 pace++;
536 pace->e_tag = ACL_USER;
537 error = check_deny(state->users->aces[i].perms.deny, 0);
538 if (error)
539 goto out_err;
540 low_mode_from_nfs4(state->users->aces[i].perms.allow,
541 &pace->e_perm, flags);
542 pace->e_id = state->users->aces[i].uid;
543 add_to_mask(state, &state->users->aces[i].perms);
544 }
545
546 pace++;
547 pace->e_tag = ACL_GROUP_OBJ;
548 error = check_deny(state->group.deny, 0);
549 if (error)
550 goto out_err;
551 low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags);
552 pace->e_id = ACL_UNDEFINED_ID;
553 add_to_mask(state, &state->group);
554
555 for (i=0; i < state->groups->n; i++) {
556 pace++;
557 pace->e_tag = ACL_GROUP;
558 error = check_deny(state->groups->aces[i].perms.deny, 0);
559 if (error)
560 goto out_err;
561 low_mode_from_nfs4(state->groups->aces[i].perms.allow,
562 &pace->e_perm, flags);
563 pace->e_id = state->groups->aces[i].uid;
564 add_to_mask(state, &state->groups->aces[i].perms);
565 }
566
567 pace++;
568 pace->e_tag = ACL_MASK;
569 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
570 pace->e_id = ACL_UNDEFINED_ID;
571
572 pace++;
573 pace->e_tag = ACL_OTHER;
574 error = check_deny(state->other.deny, 0);
575 if (error)
576 goto out_err;
577 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
578 pace->e_id = ACL_UNDEFINED_ID;
579
580 return pacl;
581out_err:
582 posix_acl_release(pacl);
583 return ERR_PTR(error);
584}
585
586static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
587{
588
589 astate->allow |= mask & ~astate->deny;
590}
591
592static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
593{
594
595 astate->deny |= mask & ~astate->allow;
596}
597
598static int find_uid(struct posix_acl_state *state, struct posix_ace_state_array *a, uid_t uid)
599{
600 int i;
601
602 for (i = 0; i < a->n; i++)
603 if (a->aces[i].uid == uid)
604 return i;
605
606 a->n++;
607 a->aces[i].uid = uid;
608 a->aces[i].perms.allow = state->everyone.allow;
609 a->aces[i].perms.deny = state->everyone.deny;
610
611 return i;
612}
613
614static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
615{
616 int i;
617
618 for (i=0; i < a->n; i++)
619 deny_bits(&a->aces[i].perms, mask);
620}
621
622static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
623{
624 int i;
625
626 for (i=0; i < a->n; i++)
627 allow_bits(&a->aces[i].perms, mask);
628}
629
630static void process_one_v4_ace(struct posix_acl_state *state,
631 struct nfs4_ace *ace)
632{
633 u32 mask = ace->access_mask;
634 int i;
635
636 state->empty = 0;
637
638 switch (ace2type(ace)) {
639 case ACL_USER_OBJ:
640 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
641 allow_bits(&state->owner, mask);
642 } else {
643 deny_bits(&state->owner, mask);
644 }
645 break;
646 case ACL_USER:
647 i = find_uid(state, state->users, ace->who);
648 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
649 allow_bits(&state->users->aces[i].perms, mask);
650 } else {
651 deny_bits(&state->users->aces[i].perms, mask);
652 mask = state->users->aces[i].perms.deny;
653 deny_bits(&state->owner, mask);
654 }
655 break;
656 case ACL_GROUP_OBJ:
657 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
658 allow_bits(&state->group, mask);
659 } else {
660 deny_bits(&state->group, mask);
661 mask = state->group.deny;
662 deny_bits(&state->owner, mask);
663 deny_bits(&state->everyone, mask);
664 deny_bits_array(state->users, mask);
665 deny_bits_array(state->groups, mask);
666 }
667 break;
668 case ACL_GROUP:
669 i = find_uid(state, state->groups, ace->who);
670 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
671 allow_bits(&state->groups->aces[i].perms, mask);
672 } else {
673 deny_bits(&state->groups->aces[i].perms, mask);
674 mask = state->groups->aces[i].perms.deny;
675 deny_bits(&state->owner, mask);
676 deny_bits(&state->group, mask);
677 deny_bits(&state->everyone, mask);
678 deny_bits_array(state->users, mask);
679 deny_bits_array(state->groups, mask);
680 }
681 break;
682 case ACL_OTHER:
683 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
684 allow_bits(&state->owner, mask);
685 allow_bits(&state->group, mask);
686 allow_bits(&state->other, mask);
687 allow_bits(&state->everyone, mask);
688 allow_bits_array(state->users, mask);
689 allow_bits_array(state->groups, mask);
690 } else {
691 deny_bits(&state->owner, mask);
692 deny_bits(&state->group, mask);
693 deny_bits(&state->other, mask);
694 deny_bits(&state->everyone, mask);
695 deny_bits_array(state->users, mask);
696 deny_bits_array(state->groups, mask);
697 }
698 }
699}
700
701int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
702 struct posix_acl **dpacl, unsigned int flags)
703{
704 struct posix_acl_state effective_acl_state, default_acl_state;
705 struct nfs4_ace *ace;
706 int ret;
707
708 ret = init_state(&effective_acl_state, acl->naces);
709 if (ret)
710 return ret;
711 ret = init_state(&default_acl_state, acl->naces);
712 if (ret)
713 goto out_estate;
714 ret = -EINVAL;
715 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
716 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
717 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
718 goto out_dstate;
719 if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
720 goto out_dstate;
721 if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
722 process_one_v4_ace(&effective_acl_state, ace);
723 continue;
724 }
725 if (!(flags & NFS4_ACL_DIR))
726 goto out_dstate;
727
728
729
730
731
732 process_one_v4_ace(&default_acl_state, ace);
733
734 if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
735 process_one_v4_ace(&effective_acl_state, ace);
736 }
737 *pacl = posix_state_to_acl(&effective_acl_state, flags);
738 if (IS_ERR(*pacl)) {
739 ret = PTR_ERR(*pacl);
740 *pacl = NULL;
741 goto out_dstate;
742 }
743 *dpacl = posix_state_to_acl(&default_acl_state,
744 flags | NFS4_ACL_TYPE_DEFAULT);
745 if (IS_ERR(*dpacl)) {
746 ret = PTR_ERR(*dpacl);
747 *dpacl = NULL;
748 posix_acl_release(*pacl);
749 *pacl = NULL;
750 goto out_dstate;
751 }
752 sort_pacl(*pacl);
753 sort_pacl(*dpacl);
754 ret = 0;
755out_dstate:
756 free_state(&default_acl_state);
757out_estate:
758 free_state(&effective_acl_state);
759 return ret;
760}
761
762static short
763ace2type(struct nfs4_ace *ace)
764{
765 switch (ace->whotype) {
766 case NFS4_ACL_WHO_NAMED:
767 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
768 ACL_GROUP : ACL_USER);
769 case NFS4_ACL_WHO_OWNER:
770 return ACL_USER_OBJ;
771 case NFS4_ACL_WHO_GROUP:
772 return ACL_GROUP_OBJ;
773 case NFS4_ACL_WHO_EVERYONE:
774 return ACL_OTHER;
775 }
776 BUG();
777 return -1;
778}
779
780EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4);
781EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix);
782
783struct nfs4_acl *
784nfs4_acl_new(int n)
785{
786 struct nfs4_acl *acl;
787
788 acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL);
789 if (acl == NULL)
790 return NULL;
791 acl->naces = 0;
792 return acl;
793}
794
795static struct {
796 char *string;
797 int stringlen;
798 int type;
799} s2t_map[] = {
800 {
801 .string = "OWNER@",
802 .stringlen = sizeof("OWNER@") - 1,
803 .type = NFS4_ACL_WHO_OWNER,
804 },
805 {
806 .string = "GROUP@",
807 .stringlen = sizeof("GROUP@") - 1,
808 .type = NFS4_ACL_WHO_GROUP,
809 },
810 {
811 .string = "EVERYONE@",
812 .stringlen = sizeof("EVERYONE@") - 1,
813 .type = NFS4_ACL_WHO_EVERYONE,
814 },
815};
816
817int
818nfs4_acl_get_whotype(char *p, u32 len)
819{
820 int i;
821
822 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
823 if (s2t_map[i].stringlen == len &&
824 0 == memcmp(s2t_map[i].string, p, len))
825 return s2t_map[i].type;
826 }
827 return NFS4_ACL_WHO_NAMED;
828}
829
830int
831nfs4_acl_write_who(int who, char *p)
832{
833 int i;
834
835 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
836 if (s2t_map[i].type == who) {
837 memcpy(p, s2t_map[i].string, s2t_map[i].stringlen);
838 return s2t_map[i].stringlen;
839 }
840 }
841 BUG();
842 return -1;
843}
844
845EXPORT_SYMBOL(nfs4_acl_new);
846EXPORT_SYMBOL(nfs4_acl_get_whotype);
847EXPORT_SYMBOL(nfs4_acl_write_who);
848