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Tiger Yang929fb012008-11-14 11:17:04 +08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * acl.c
5 *
6 * Copyright (C) 2004, 2008 Oracle. All rights reserved.
7 *
8 * CREDITS:
9 * Lots of code in this file is copy from linux/fs/ext3/acl.c.
10 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public
14 * License version 2 as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 */
21
22#include <linux/init.h>
23#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Tiger Yang929fb012008-11-14 11:17:04 +080025#include <linux/string.h>
26
Tiger Yang929fb012008-11-14 11:17:04 +080027#include <cluster/masklog.h>
28
29#include "ocfs2.h"
30#include "alloc.h"
31#include "dlmglue.h"
32#include "file.h"
Mark Fashehfcefd252010-03-15 15:39:00 -070033#include "inode.h"
34#include "journal.h"
Tiger Yang929fb012008-11-14 11:17:04 +080035#include "ocfs2_fs.h"
36
37#include "xattr.h"
38#include "acl.h"
39
40/*
41 * Convert from xattr value to acl struct.
42 */
43static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
44{
45 int n, count;
46 struct posix_acl *acl;
47
48 if (!value)
49 return NULL;
50 if (size < sizeof(struct posix_acl_entry))
51 return ERR_PTR(-EINVAL);
52
53 count = size / sizeof(struct posix_acl_entry);
54 if (count < 0)
55 return ERR_PTR(-EINVAL);
56 if (count == 0)
57 return NULL;
58
59 acl = posix_acl_alloc(count, GFP_NOFS);
60 if (!acl)
61 return ERR_PTR(-ENOMEM);
62 for (n = 0; n < count; n++) {
63 struct ocfs2_acl_entry *entry =
64 (struct ocfs2_acl_entry *)value;
65
66 acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
67 acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
68 acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
69 value += sizeof(struct posix_acl_entry);
70
71 }
72 return acl;
73}
74
75/*
76 * Convert acl struct to xattr value.
77 */
78static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
79{
80 struct ocfs2_acl_entry *entry = NULL;
81 char *ocfs2_acl;
82 size_t n;
83
84 *size = acl->a_count * sizeof(struct posix_acl_entry);
85
86 ocfs2_acl = kmalloc(*size, GFP_NOFS);
87 if (!ocfs2_acl)
88 return ERR_PTR(-ENOMEM);
89
90 entry = (struct ocfs2_acl_entry *)ocfs2_acl;
91 for (n = 0; n < acl->a_count; n++, entry++) {
92 entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
93 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
94 entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
95 }
96 return ocfs2_acl;
97}
98
99static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
100 int type,
101 struct buffer_head *di_bh)
102{
Tiger Yang929fb012008-11-14 11:17:04 +0800103 int name_index;
104 char *value = NULL;
105 struct posix_acl *acl;
106 int retval;
107
Tiger Yang929fb012008-11-14 11:17:04 +0800108 switch (type) {
109 case ACL_TYPE_ACCESS:
110 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
111 break;
112 case ACL_TYPE_DEFAULT:
113 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
114 break;
115 default:
116 return ERR_PTR(-EINVAL);
117 }
118
119 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
120 if (retval > 0) {
121 value = kmalloc(retval, GFP_NOFS);
122 if (!value)
123 return ERR_PTR(-ENOMEM);
124 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
125 "", value, retval);
126 }
127
128 if (retval > 0)
129 acl = ocfs2_acl_from_xattr(value, retval);
130 else if (retval == -ENODATA || retval == 0)
131 acl = NULL;
132 else
133 acl = ERR_PTR(retval);
134
135 kfree(value);
136
137 return acl;
138}
139
140
141/*
142 * Get posix acl.
143 */
144static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
145{
146 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
147 struct buffer_head *di_bh = NULL;
148 struct posix_acl *acl;
149 int ret;
150
151 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
152 return NULL;
153
154 ret = ocfs2_inode_lock(inode, &di_bh, 0);
155 if (ret < 0) {
156 mlog_errno(ret);
157 acl = ERR_PTR(ret);
158 return acl;
159 }
160
161 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
162
163 ocfs2_inode_unlock(inode, 0);
164
165 brelse(di_bh);
166
167 return acl;
168}
169
170/*
Mark Fashehfcefd252010-03-15 15:39:00 -0700171 * Helper function to set i_mode in memory and disk. Some call paths
172 * will not have di_bh or a journal handle to pass, in which case it
173 * will create it's own.
174 */
175static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
176 handle_t *handle, umode_t new_mode)
177{
178 int ret, commit_handle = 0;
179 struct ocfs2_dinode *di;
180
181 if (di_bh == NULL) {
182 ret = ocfs2_read_inode_block(inode, &di_bh);
183 if (ret) {
184 mlog_errno(ret);
185 goto out;
186 }
187 } else
188 get_bh(di_bh);
189
190 if (handle == NULL) {
191 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
192 OCFS2_INODE_UPDATE_CREDITS);
193 if (IS_ERR(handle)) {
194 ret = PTR_ERR(handle);
195 mlog_errno(ret);
196 goto out_brelse;
197 }
198
199 commit_handle = 1;
200 }
201
202 di = (struct ocfs2_dinode *)di_bh->b_data;
203 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
204 OCFS2_JOURNAL_ACCESS_WRITE);
205 if (ret) {
206 mlog_errno(ret);
207 goto out_commit;
208 }
209
210 inode->i_mode = new_mode;
Tao Ma12828062010-09-13 14:00:23 +0800211 inode->i_ctime = CURRENT_TIME;
Mark Fashehfcefd252010-03-15 15:39:00 -0700212 di->i_mode = cpu_to_le16(inode->i_mode);
Tao Ma12828062010-09-13 14:00:23 +0800213 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
214 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
Mark Fashehfcefd252010-03-15 15:39:00 -0700215
216 ocfs2_journal_dirty(handle, di_bh);
217
218out_commit:
219 if (commit_handle)
220 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
221out_brelse:
222 brelse(di_bh);
223out:
224 return ret;
225}
226
227/*
Tiger Yang929fb012008-11-14 11:17:04 +0800228 * Set the access or default ACL of an inode.
229 */
230static int ocfs2_set_acl(handle_t *handle,
231 struct inode *inode,
232 struct buffer_head *di_bh,
233 int type,
234 struct posix_acl *acl,
235 struct ocfs2_alloc_context *meta_ac,
236 struct ocfs2_alloc_context *data_ac)
237{
238 int name_index;
239 void *value = NULL;
240 size_t size = 0;
241 int ret;
242
243 if (S_ISLNK(inode->i_mode))
244 return -EOPNOTSUPP;
245
246 switch (type) {
247 case ACL_TYPE_ACCESS:
248 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
249 if (acl) {
250 mode_t mode = inode->i_mode;
251 ret = posix_acl_equiv_mode(acl, &mode);
252 if (ret < 0)
253 return ret;
254 else {
Tiger Yang929fb012008-11-14 11:17:04 +0800255 if (ret == 0)
256 acl = NULL;
Mark Fashehfcefd252010-03-15 15:39:00 -0700257
258 ret = ocfs2_acl_set_mode(inode, di_bh,
259 handle, mode);
260 if (ret)
261 return ret;
262
Tiger Yang929fb012008-11-14 11:17:04 +0800263 }
264 }
265 break;
266 case ACL_TYPE_DEFAULT:
267 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
268 if (!S_ISDIR(inode->i_mode))
269 return acl ? -EACCES : 0;
270 break;
271 default:
272 return -EINVAL;
273 }
274
275 if (acl) {
276 value = ocfs2_acl_to_xattr(acl, &size);
277 if (IS_ERR(value))
278 return (int)PTR_ERR(value);
279 }
280
281 if (handle)
282 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
283 "", value, size, 0,
284 meta_ac, data_ac);
285 else
286 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
287
288 kfree(value);
289
290 return ret;
291}
292
Al Viro7e401452011-06-20 19:12:17 -0400293int ocfs2_check_acl(struct inode *inode, int mask)
Tiger Yang23fc2702008-11-14 11:17:18 +0800294{
Nick Pigginb74c79e2011-01-07 17:49:58 +1100295 struct ocfs2_super *osb;
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800296 struct buffer_head *di_bh = NULL;
297 struct posix_acl *acl;
298 int ret = -EAGAIN;
Tiger Yang23fc2702008-11-14 11:17:18 +0800299
Al Viro9c2c7032011-06-20 19:06:22 -0400300 if (mask & MAY_NOT_BLOCK)
Nick Pigginb74c79e2011-01-07 17:49:58 +1100301 return -ECHILD;
302
303 osb = OCFS2_SB(inode->i_sb);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800304 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
305 return ret;
306
307 ret = ocfs2_read_inode_block(inode, &di_bh);
308 if (ret < 0) {
309 mlog_errno(ret);
310 return ret;
311 }
312
313 acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, di_bh);
314
315 brelse(di_bh);
316
317 if (IS_ERR(acl)) {
318 mlog_errno(PTR_ERR(acl));
Tiger Yang23fc2702008-11-14 11:17:18 +0800319 return PTR_ERR(acl);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800320 }
Tiger Yang23fc2702008-11-14 11:17:18 +0800321 if (acl) {
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800322 ret = posix_acl_permission(inode, acl, mask);
Tiger Yang23fc2702008-11-14 11:17:18 +0800323 posix_acl_release(acl);
324 return ret;
325 }
326
327 return -EAGAIN;
328}
329
Tiger Yang060bc662008-11-14 11:17:29 +0800330int ocfs2_acl_chmod(struct inode *inode)
331{
332 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
333 struct posix_acl *acl, *clone;
334 int ret;
335
336 if (S_ISLNK(inode->i_mode))
337 return -EOPNOTSUPP;
338
339 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
340 return 0;
341
342 acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
343 if (IS_ERR(acl) || !acl)
344 return PTR_ERR(acl);
345 clone = posix_acl_clone(acl, GFP_KERNEL);
346 posix_acl_release(acl);
347 if (!clone)
348 return -ENOMEM;
349 ret = posix_acl_chmod_masq(clone, inode->i_mode);
350 if (!ret)
351 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
352 clone, NULL, NULL);
353 posix_acl_release(clone);
354 return ret;
355}
356
Tiger Yang89c38bd2008-11-14 11:17:41 +0800357/*
358 * Initialize the ACLs of a new inode. If parent directory has default ACL,
359 * then clone to new inode. Called from ocfs2_mknod.
360 */
361int ocfs2_init_acl(handle_t *handle,
362 struct inode *inode,
363 struct inode *dir,
364 struct buffer_head *di_bh,
365 struct buffer_head *dir_bh,
366 struct ocfs2_alloc_context *meta_ac,
367 struct ocfs2_alloc_context *data_ac)
368{
369 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
370 struct posix_acl *acl = NULL;
Tiger Yang6eda3dd2010-07-16 11:21:23 +0800371 int ret = 0, ret2;
Mark Fashehfcefd252010-03-15 15:39:00 -0700372 mode_t mode;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800373
374 if (!S_ISLNK(inode->i_mode)) {
375 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
376 acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
377 dir_bh);
378 if (IS_ERR(acl))
379 return PTR_ERR(acl);
380 }
Mark Fashehfcefd252010-03-15 15:39:00 -0700381 if (!acl) {
382 mode = inode->i_mode & ~current_umask();
383 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
384 if (ret) {
385 mlog_errno(ret);
386 goto cleanup;
387 }
388 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800389 }
390 if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
391 struct posix_acl *clone;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800392
393 if (S_ISDIR(inode->i_mode)) {
394 ret = ocfs2_set_acl(handle, inode, di_bh,
395 ACL_TYPE_DEFAULT, acl,
396 meta_ac, data_ac);
397 if (ret)
398 goto cleanup;
399 }
400 clone = posix_acl_clone(acl, GFP_NOFS);
401 ret = -ENOMEM;
402 if (!clone)
403 goto cleanup;
404
405 mode = inode->i_mode;
406 ret = posix_acl_create_masq(clone, &mode);
407 if (ret >= 0) {
Tiger Yang6eda3dd2010-07-16 11:21:23 +0800408 ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
409 if (ret2) {
410 mlog_errno(ret2);
411 ret = ret2;
412 goto cleanup;
413 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800414 if (ret > 0) {
415 ret = ocfs2_set_acl(handle, inode,
416 di_bh, ACL_TYPE_ACCESS,
417 clone, meta_ac, data_ac);
418 }
419 }
420 posix_acl_release(clone);
421 }
422cleanup:
423 posix_acl_release(acl);
424 return ret;
425}
426
Christoph Hellwig431547b2009-11-13 09:52:56 +0000427static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800428 char *list,
429 size_t list_len,
430 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000431 size_t name_len,
432 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800433{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000434 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800435 const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
436
437 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
438 return 0;
439
440 if (list && size <= list_len)
441 memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
442 return size;
443}
444
Christoph Hellwig431547b2009-11-13 09:52:56 +0000445static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800446 char *list,
447 size_t list_len,
448 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000449 size_t name_len,
450 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800451{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000452 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800453 const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
454
455 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
456 return 0;
457
458 if (list && size <= list_len)
459 memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
460 return size;
461}
462
Christoph Hellwig431547b2009-11-13 09:52:56 +0000463static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name,
464 void *buffer, size_t size, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800465{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000466 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800467 struct posix_acl *acl;
468 int ret;
469
Christoph Hellwig431547b2009-11-13 09:52:56 +0000470 if (strcmp(name, "") != 0)
471 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800472 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
473 return -EOPNOTSUPP;
474
Christoph Hellwig431547b2009-11-13 09:52:56 +0000475 acl = ocfs2_get_acl(dentry->d_inode, type);
Tiger Yang929fb012008-11-14 11:17:04 +0800476 if (IS_ERR(acl))
477 return PTR_ERR(acl);
478 if (acl == NULL)
479 return -ENODATA;
480 ret = posix_acl_to_xattr(acl, buffer, size);
481 posix_acl_release(acl);
482
483 return ret;
484}
485
Christoph Hellwig431547b2009-11-13 09:52:56 +0000486static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name,
487 const void *value, size_t size, int flags, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800488{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000489 struct inode *inode = dentry->d_inode;
Tiger Yang929fb012008-11-14 11:17:04 +0800490 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
491 struct posix_acl *acl;
492 int ret = 0;
493
Christoph Hellwig431547b2009-11-13 09:52:56 +0000494 if (strcmp(name, "") != 0)
495 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800496 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
497 return -EOPNOTSUPP;
498
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700499 if (!inode_owner_or_capable(inode))
Tiger Yang929fb012008-11-14 11:17:04 +0800500 return -EPERM;
501
502 if (value) {
503 acl = posix_acl_from_xattr(value, size);
504 if (IS_ERR(acl))
505 return PTR_ERR(acl);
506 else if (acl) {
507 ret = posix_acl_valid(acl);
508 if (ret)
509 goto cleanup;
510 }
511 } else
512 acl = NULL;
513
514 ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
515
516cleanup:
517 posix_acl_release(acl);
518 return ret;
519}
520
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700521const struct xattr_handler ocfs2_xattr_acl_access_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800522 .prefix = POSIX_ACL_XATTR_ACCESS,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000523 .flags = ACL_TYPE_ACCESS,
Tiger Yang929fb012008-11-14 11:17:04 +0800524 .list = ocfs2_xattr_list_acl_access,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000525 .get = ocfs2_xattr_get_acl,
526 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800527};
528
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700529const struct xattr_handler ocfs2_xattr_acl_default_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800530 .prefix = POSIX_ACL_XATTR_DEFAULT,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000531 .flags = ACL_TYPE_DEFAULT,
Tiger Yang929fb012008-11-14 11:17:04 +0800532 .list = ocfs2_xattr_list_acl_default,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000533 .get = ocfs2_xattr_get_acl,
534 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800535};