4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdclass/acl.c
38 * Lustre Access Control List.
40 * Author: Fan Yong <fanyong@clusterfs.com>
43 #define DEBUG_SUBSYSTEM S_SEC
44 #include "../include/lu_object.h"
45 #include "../include/lustre_acl.h"
46 #include "../include/lustre_eacl.h"
47 #include "../include/obd_support.h"
49 #ifdef CONFIG_FS_POSIX_ACL
51 #define CFS_ACL_XATTR_VERSION POSIX_ACL_XATTR_VERSION
54 ES_UNK = 0, /* unknown stat */
55 ES_UNC = 1, /* ACL entry is not changed */
56 ES_MOD = 2, /* ACL entry is modified */
57 ES_ADD = 3, /* ACL entry is added */
58 ES_DEL = 4 /* ACL entry is deleted */
61 static inline void lustre_ext_acl_le_to_cpu(ext_acl_xattr_entry *d,
62 ext_acl_xattr_entry *s)
64 d->e_tag = le16_to_cpu(s->e_tag);
65 d->e_perm = le16_to_cpu(s->e_perm);
66 d->e_id = le32_to_cpu(s->e_id);
67 d->e_stat = le32_to_cpu(s->e_stat);
70 static inline void lustre_ext_acl_cpu_to_le(ext_acl_xattr_entry *d,
71 ext_acl_xattr_entry *s)
73 d->e_tag = cpu_to_le16(s->e_tag);
74 d->e_perm = cpu_to_le16(s->e_perm);
75 d->e_id = cpu_to_le32(s->e_id);
76 d->e_stat = cpu_to_le32(s->e_stat);
79 static inline void lustre_posix_acl_le_to_cpu(posix_acl_xattr_entry *d,
80 posix_acl_xattr_entry *s)
82 d->e_tag = le16_to_cpu(s->e_tag);
83 d->e_perm = le16_to_cpu(s->e_perm);
84 d->e_id = le32_to_cpu(s->e_id);
87 static inline void lustre_posix_acl_cpu_to_le(posix_acl_xattr_entry *d,
88 posix_acl_xattr_entry *s)
90 d->e_tag = cpu_to_le16(s->e_tag);
91 d->e_perm = cpu_to_le16(s->e_perm);
92 d->e_id = cpu_to_le32(s->e_id);
95 /* if "new_count == 0", then "new = {a_version, NULL}", NOT NULL. */
96 static int lustre_posix_acl_xattr_reduce_space(posix_acl_xattr_header **header,
97 int old_count, int new_count)
99 int old_size = CFS_ACL_XATTR_SIZE(old_count, posix_acl_xattr);
100 int new_size = CFS_ACL_XATTR_SIZE(new_count, posix_acl_xattr);
101 posix_acl_xattr_header *new;
103 if (unlikely(old_count <= new_count))
106 new = kmemdup(*header, new_size, GFP_NOFS);
107 if (unlikely(new == NULL))
115 /* if "new_count == 0", then "new = {0, NULL}", NOT NULL. */
116 static int lustre_ext_acl_xattr_reduce_space(ext_acl_xattr_header **header,
119 int ext_count = le32_to_cpu((*header)->a_count);
120 int ext_size = CFS_ACL_XATTR_SIZE(ext_count, ext_acl_xattr);
121 ext_acl_xattr_header *new;
123 if (unlikely(old_count <= ext_count))
126 new = kmemdup(*header, ext_size, GFP_NOFS);
127 if (unlikely(new == NULL))
136 * Generate new extended ACL based on the posix ACL.
138 ext_acl_xattr_header *
139 lustre_posix_acl_xattr_2ext(posix_acl_xattr_header *header, int size)
142 ext_acl_xattr_header *new;
144 if (unlikely(size < 0))
145 return ERR_PTR(-EINVAL);
149 count = CFS_ACL_XATTR_COUNT(size, posix_acl_xattr);
150 esize = CFS_ACL_XATTR_SIZE(count, ext_acl_xattr);
151 new = kzalloc(esize, GFP_NOFS);
152 if (unlikely(new == NULL))
153 return ERR_PTR(-ENOMEM);
155 new->a_count = cpu_to_le32(count);
156 for (i = 0; i < count; i++) {
157 new->a_entries[i].e_tag = header->a_entries[i].e_tag;
158 new->a_entries[i].e_perm = header->a_entries[i].e_perm;
159 new->a_entries[i].e_id = header->a_entries[i].e_id;
160 new->a_entries[i].e_stat = cpu_to_le32(ES_UNK);
165 EXPORT_SYMBOL(lustre_posix_acl_xattr_2ext);
168 * Filter out the "nobody" entries in the posix ACL.
170 int lustre_posix_acl_xattr_filter(posix_acl_xattr_header *header, size_t size,
171 posix_acl_xattr_header **out)
173 int count, i, j, rc = 0;
175 posix_acl_xattr_header *new;
179 if (size < sizeof(*new))
182 new = kzalloc(size, GFP_NOFS);
183 if (unlikely(new == NULL))
186 new->a_version = cpu_to_le32(CFS_ACL_XATTR_VERSION);
187 count = CFS_ACL_XATTR_COUNT(size, posix_acl_xattr);
188 for (i = 0, j = 0; i < count; i++) {
189 id = le32_to_cpu(header->a_entries[i].e_id);
190 switch (le16_to_cpu(header->a_entries[i].e_tag)) {
195 if (id != ACL_UNDEFINED_ID) {
200 memcpy(&new->a_entries[j++], &header->a_entries[i],
201 sizeof(posix_acl_xattr_entry));
204 if (id != NOBODY_UID)
205 memcpy(&new->a_entries[j++],
206 &header->a_entries[i],
207 sizeof(posix_acl_xattr_entry));
210 if (id != NOBODY_GID)
211 memcpy(&new->a_entries[j++],
212 &header->a_entries[i],
213 sizeof(posix_acl_xattr_entry));
221 /* free unused space. */
222 rc = lustre_posix_acl_xattr_reduce_space(&new, count, j);
236 EXPORT_SYMBOL(lustre_posix_acl_xattr_filter);
239 * Release the posix ACL space.
241 void lustre_posix_acl_xattr_free(posix_acl_xattr_header *header, int size)
245 EXPORT_SYMBOL(lustre_posix_acl_xattr_free);
248 * Release the extended ACL space.
250 void lustre_ext_acl_xattr_free(ext_acl_xattr_header *header)
254 EXPORT_SYMBOL(lustre_ext_acl_xattr_free);
256 static ext_acl_xattr_entry *
257 lustre_ext_acl_xattr_search(ext_acl_xattr_header *header,
258 posix_acl_xattr_entry *entry, int *pos)
260 int once, start, end, i, j, count = le32_to_cpu(header->a_count);
267 for (i = start; i < end; i++) {
268 if (header->a_entries[i].e_tag == entry->e_tag &&
269 header->a_entries[i].e_id == entry->e_id) {
274 return &header->a_entries[j];
289 * Merge the posix ACL and the extended ACL into new extended ACL.
291 ext_acl_xattr_header *
292 lustre_acl_xattr_merge2ext(posix_acl_xattr_header *posix_header, int size,
293 ext_acl_xattr_header *ext_header)
295 int ori_ext_count, posix_count, ext_count, ext_size;
296 int i, j, pos = 0, rc = 0;
297 posix_acl_xattr_entry pae;
298 ext_acl_xattr_header *new;
299 ext_acl_xattr_entry *ee, eae;
301 if (unlikely(size < 0))
302 return ERR_PTR(-EINVAL);
306 posix_count = CFS_ACL_XATTR_COUNT(size, posix_acl_xattr);
307 ori_ext_count = le32_to_cpu(ext_header->a_count);
308 ext_count = posix_count + ori_ext_count;
309 ext_size = CFS_ACL_XATTR_SIZE(ext_count, ext_acl_xattr);
311 new = kzalloc(ext_size, GFP_NOFS);
312 if (unlikely(new == NULL))
313 return ERR_PTR(-ENOMEM);
315 for (i = 0, j = 0; i < posix_count; i++) {
316 lustre_posix_acl_le_to_cpu(&pae, &posix_header->a_entries[i]);
322 if (pae.e_id != ACL_UNDEFINED_ID) {
327 /* ignore "nobody" entry. */
328 if (pae.e_id == NOBODY_UID)
331 new->a_entries[j].e_tag =
332 posix_header->a_entries[i].e_tag;
333 new->a_entries[j].e_perm =
334 posix_header->a_entries[i].e_perm;
335 new->a_entries[j].e_id =
336 posix_header->a_entries[i].e_id;
337 ee = lustre_ext_acl_xattr_search(ext_header,
338 &posix_header->a_entries[i], &pos);
340 if (posix_header->a_entries[i].e_perm !=
342 /* entry modified. */
344 new->a_entries[j++].e_stat =
347 /* entry unchanged. */
349 new->a_entries[j++].e_stat =
353 new->a_entries[j++].e_stat =
358 /* ignore "nobody" entry. */
359 if (pae.e_id == NOBODY_GID)
361 new->a_entries[j].e_tag =
362 posix_header->a_entries[i].e_tag;
363 new->a_entries[j].e_perm =
364 posix_header->a_entries[i].e_perm;
365 new->a_entries[j].e_id =
366 posix_header->a_entries[i].e_id;
367 ee = lustre_ext_acl_xattr_search(ext_header,
368 &posix_header->a_entries[i], &pos);
370 if (posix_header->a_entries[i].e_perm !=
372 /* entry modified. */
374 new->a_entries[j++].e_stat =
377 /* entry unchanged. */
379 new->a_entries[j++].e_stat =
383 new->a_entries[j++].e_stat =
393 /* process deleted entries. */
394 for (i = 0; i < ori_ext_count; i++) {
395 lustre_ext_acl_le_to_cpu(&eae, &ext_header->a_entries[i]);
396 if (eae.e_stat == ES_UNK) {
397 /* ignore "nobody" entry. */
398 if ((eae.e_tag == ACL_USER && eae.e_id == NOBODY_UID) ||
399 (eae.e_tag == ACL_GROUP && eae.e_id == NOBODY_GID))
402 new->a_entries[j].e_tag =
403 ext_header->a_entries[i].e_tag;
404 new->a_entries[j].e_perm =
405 ext_header->a_entries[i].e_perm;
406 new->a_entries[j].e_id = ext_header->a_entries[i].e_id;
407 new->a_entries[j++].e_stat = cpu_to_le32(ES_DEL);
411 new->a_count = cpu_to_le32(j);
412 /* free unused space. */
413 rc = lustre_ext_acl_xattr_reduce_space(&new, ext_count);
422 EXPORT_SYMBOL(lustre_acl_xattr_merge2ext);