blob: 704f6b1742f3204ddf9eae9bb0ebbdfd0e1fcace [file] [log] [blame]
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
27#define MLOG_MASK_PREFIX ML_INODE
28#include <cluster/masklog.h>
29
30#include "ocfs2.h"
31#include "alloc.h"
32#include "dlmglue.h"
33#include "file.h"
Mark Fashehfcefd252010-03-15 15:39:00 -070034#include "inode.h"
35#include "journal.h"
Tiger Yang929fb012008-11-14 11:17:04 +080036#include "ocfs2_fs.h"
37
38#include "xattr.h"
39#include "acl.h"
40
41/*
42 * Convert from xattr value to acl struct.
43 */
44static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
45{
46 int n, count;
47 struct posix_acl *acl;
48
49 if (!value)
50 return NULL;
51 if (size < sizeof(struct posix_acl_entry))
52 return ERR_PTR(-EINVAL);
53
54 count = size / sizeof(struct posix_acl_entry);
55 if (count < 0)
56 return ERR_PTR(-EINVAL);
57 if (count == 0)
58 return NULL;
59
60 acl = posix_acl_alloc(count, GFP_NOFS);
61 if (!acl)
62 return ERR_PTR(-ENOMEM);
63 for (n = 0; n < count; n++) {
64 struct ocfs2_acl_entry *entry =
65 (struct ocfs2_acl_entry *)value;
66
67 acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
68 acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
69 acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
70 value += sizeof(struct posix_acl_entry);
71
72 }
73 return acl;
74}
75
76/*
77 * Convert acl struct to xattr value.
78 */
79static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
80{
81 struct ocfs2_acl_entry *entry = NULL;
82 char *ocfs2_acl;
83 size_t n;
84
85 *size = acl->a_count * sizeof(struct posix_acl_entry);
86
87 ocfs2_acl = kmalloc(*size, GFP_NOFS);
88 if (!ocfs2_acl)
89 return ERR_PTR(-ENOMEM);
90
91 entry = (struct ocfs2_acl_entry *)ocfs2_acl;
92 for (n = 0; n < acl->a_count; n++, entry++) {
93 entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
94 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
95 entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
96 }
97 return ocfs2_acl;
98}
99
100static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
101 int type,
102 struct buffer_head *di_bh)
103{
Tiger Yang929fb012008-11-14 11:17:04 +0800104 int name_index;
105 char *value = NULL;
106 struct posix_acl *acl;
107 int retval;
108
Tiger Yang929fb012008-11-14 11:17:04 +0800109 switch (type) {
110 case ACL_TYPE_ACCESS:
111 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
112 break;
113 case ACL_TYPE_DEFAULT:
114 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
115 break;
116 default:
117 return ERR_PTR(-EINVAL);
118 }
119
120 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
121 if (retval > 0) {
122 value = kmalloc(retval, GFP_NOFS);
123 if (!value)
124 return ERR_PTR(-ENOMEM);
125 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
126 "", value, retval);
127 }
128
129 if (retval > 0)
130 acl = ocfs2_acl_from_xattr(value, retval);
131 else if (retval == -ENODATA || retval == 0)
132 acl = NULL;
133 else
134 acl = ERR_PTR(retval);
135
136 kfree(value);
137
138 return acl;
139}
140
141
142/*
143 * Get posix acl.
144 */
145static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
146{
147 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
148 struct buffer_head *di_bh = NULL;
149 struct posix_acl *acl;
150 int ret;
151
152 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
153 return NULL;
154
155 ret = ocfs2_inode_lock(inode, &di_bh, 0);
156 if (ret < 0) {
157 mlog_errno(ret);
158 acl = ERR_PTR(ret);
159 return acl;
160 }
161
162 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
163
164 ocfs2_inode_unlock(inode, 0);
165
166 brelse(di_bh);
167
168 return acl;
169}
170
171/*
Mark Fashehfcefd252010-03-15 15:39:00 -0700172 * Helper function to set i_mode in memory and disk. Some call paths
173 * will not have di_bh or a journal handle to pass, in which case it
174 * will create it's own.
175 */
176static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
177 handle_t *handle, umode_t new_mode)
178{
179 int ret, commit_handle = 0;
180 struct ocfs2_dinode *di;
181
182 if (di_bh == NULL) {
183 ret = ocfs2_read_inode_block(inode, &di_bh);
184 if (ret) {
185 mlog_errno(ret);
186 goto out;
187 }
188 } else
189 get_bh(di_bh);
190
191 if (handle == NULL) {
192 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
193 OCFS2_INODE_UPDATE_CREDITS);
194 if (IS_ERR(handle)) {
195 ret = PTR_ERR(handle);
196 mlog_errno(ret);
197 goto out_brelse;
198 }
199
200 commit_handle = 1;
201 }
202
203 di = (struct ocfs2_dinode *)di_bh->b_data;
204 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
205 OCFS2_JOURNAL_ACCESS_WRITE);
206 if (ret) {
207 mlog_errno(ret);
208 goto out_commit;
209 }
210
211 inode->i_mode = new_mode;
Tao Ma12828062010-09-13 14:00:23 +0800212 inode->i_ctime = CURRENT_TIME;
Mark Fashehfcefd252010-03-15 15:39:00 -0700213 di->i_mode = cpu_to_le16(inode->i_mode);
Tao Ma12828062010-09-13 14:00:23 +0800214 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
215 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
Mark Fashehfcefd252010-03-15 15:39:00 -0700216
217 ocfs2_journal_dirty(handle, di_bh);
218
219out_commit:
220 if (commit_handle)
221 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
222out_brelse:
223 brelse(di_bh);
224out:
225 return ret;
226}
227
228/*
Tiger Yang929fb012008-11-14 11:17:04 +0800229 * Set the access or default ACL of an inode.
230 */
231static int ocfs2_set_acl(handle_t *handle,
232 struct inode *inode,
233 struct buffer_head *di_bh,
234 int type,
235 struct posix_acl *acl,
236 struct ocfs2_alloc_context *meta_ac,
237 struct ocfs2_alloc_context *data_ac)
238{
239 int name_index;
240 void *value = NULL;
241 size_t size = 0;
242 int ret;
243
244 if (S_ISLNK(inode->i_mode))
245 return -EOPNOTSUPP;
246
247 switch (type) {
248 case ACL_TYPE_ACCESS:
249 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
250 if (acl) {
251 mode_t mode = inode->i_mode;
252 ret = posix_acl_equiv_mode(acl, &mode);
253 if (ret < 0)
254 return ret;
255 else {
Tiger Yang929fb012008-11-14 11:17:04 +0800256 if (ret == 0)
257 acl = NULL;
Mark Fashehfcefd252010-03-15 15:39:00 -0700258
259 ret = ocfs2_acl_set_mode(inode, di_bh,
260 handle, mode);
261 if (ret)
262 return ret;
263
Tiger Yang929fb012008-11-14 11:17:04 +0800264 }
265 }
266 break;
267 case ACL_TYPE_DEFAULT:
268 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
269 if (!S_ISDIR(inode->i_mode))
270 return acl ? -EACCES : 0;
271 break;
272 default:
273 return -EINVAL;
274 }
275
276 if (acl) {
277 value = ocfs2_acl_to_xattr(acl, &size);
278 if (IS_ERR(value))
279 return (int)PTR_ERR(value);
280 }
281
282 if (handle)
283 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
284 "", value, size, 0,
285 meta_ac, data_ac);
286 else
287 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
288
289 kfree(value);
290
291 return ret;
292}
293
Nick Pigginb74c79e2011-01-07 17:49:58 +1100294int ocfs2_check_acl(struct inode *inode, int mask, unsigned int flags)
Tiger Yang23fc2702008-11-14 11:17:18 +0800295{
Nick Pigginb74c79e2011-01-07 17:49:58 +1100296 struct ocfs2_super *osb;
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800297 struct buffer_head *di_bh = NULL;
298 struct posix_acl *acl;
299 int ret = -EAGAIN;
Tiger Yang23fc2702008-11-14 11:17:18 +0800300
Nick Pigginb74c79e2011-01-07 17:49:58 +1100301 if (flags & IPERM_FLAG_RCU)
302 return -ECHILD;
303
304 osb = OCFS2_SB(inode->i_sb);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800305 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
306 return ret;
307
308 ret = ocfs2_read_inode_block(inode, &di_bh);
309 if (ret < 0) {
310 mlog_errno(ret);
311 return ret;
312 }
313
314 acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, di_bh);
315
316 brelse(di_bh);
317
318 if (IS_ERR(acl)) {
319 mlog_errno(PTR_ERR(acl));
Tiger Yang23fc2702008-11-14 11:17:18 +0800320 return PTR_ERR(acl);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800321 }
Tiger Yang23fc2702008-11-14 11:17:18 +0800322 if (acl) {
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800323 ret = posix_acl_permission(inode, acl, mask);
Tiger Yang23fc2702008-11-14 11:17:18 +0800324 posix_acl_release(acl);
325 return ret;
326 }
327
328 return -EAGAIN;
329}
330
Tiger Yang060bc662008-11-14 11:17:29 +0800331int ocfs2_acl_chmod(struct inode *inode)
332{
333 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
334 struct posix_acl *acl, *clone;
335 int ret;
336
337 if (S_ISLNK(inode->i_mode))
338 return -EOPNOTSUPP;
339
340 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
341 return 0;
342
343 acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
344 if (IS_ERR(acl) || !acl)
345 return PTR_ERR(acl);
346 clone = posix_acl_clone(acl, GFP_KERNEL);
347 posix_acl_release(acl);
348 if (!clone)
349 return -ENOMEM;
350 ret = posix_acl_chmod_masq(clone, inode->i_mode);
351 if (!ret)
352 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
353 clone, NULL, NULL);
354 posix_acl_release(clone);
355 return ret;
356}
357
Tiger Yang89c38bd2008-11-14 11:17:41 +0800358/*
359 * Initialize the ACLs of a new inode. If parent directory has default ACL,
360 * then clone to new inode. Called from ocfs2_mknod.
361 */
362int ocfs2_init_acl(handle_t *handle,
363 struct inode *inode,
364 struct inode *dir,
365 struct buffer_head *di_bh,
366 struct buffer_head *dir_bh,
367 struct ocfs2_alloc_context *meta_ac,
368 struct ocfs2_alloc_context *data_ac)
369{
370 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
371 struct posix_acl *acl = NULL;
Tiger Yang6eda3dd2010-07-16 11:21:23 +0800372 int ret = 0, ret2;
Mark Fashehfcefd252010-03-15 15:39:00 -0700373 mode_t mode;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800374
375 if (!S_ISLNK(inode->i_mode)) {
376 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
377 acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
378 dir_bh);
379 if (IS_ERR(acl))
380 return PTR_ERR(acl);
381 }
Mark Fashehfcefd252010-03-15 15:39:00 -0700382 if (!acl) {
383 mode = inode->i_mode & ~current_umask();
384 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
385 if (ret) {
386 mlog_errno(ret);
387 goto cleanup;
388 }
389 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800390 }
391 if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
392 struct posix_acl *clone;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800393
394 if (S_ISDIR(inode->i_mode)) {
395 ret = ocfs2_set_acl(handle, inode, di_bh,
396 ACL_TYPE_DEFAULT, acl,
397 meta_ac, data_ac);
398 if (ret)
399 goto cleanup;
400 }
401 clone = posix_acl_clone(acl, GFP_NOFS);
402 ret = -ENOMEM;
403 if (!clone)
404 goto cleanup;
405
406 mode = inode->i_mode;
407 ret = posix_acl_create_masq(clone, &mode);
408 if (ret >= 0) {
Tiger Yang6eda3dd2010-07-16 11:21:23 +0800409 ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
410 if (ret2) {
411 mlog_errno(ret2);
412 ret = ret2;
413 goto cleanup;
414 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800415 if (ret > 0) {
416 ret = ocfs2_set_acl(handle, inode,
417 di_bh, ACL_TYPE_ACCESS,
418 clone, meta_ac, data_ac);
419 }
420 }
421 posix_acl_release(clone);
422 }
423cleanup:
424 posix_acl_release(acl);
425 return ret;
426}
427
Christoph Hellwig431547b2009-11-13 09:52:56 +0000428static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800429 char *list,
430 size_t list_len,
431 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000432 size_t name_len,
433 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800434{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000435 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800436 const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
437
438 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
439 return 0;
440
441 if (list && size <= list_len)
442 memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
443 return size;
444}
445
Christoph Hellwig431547b2009-11-13 09:52:56 +0000446static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800447 char *list,
448 size_t list_len,
449 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000450 size_t name_len,
451 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800452{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000453 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800454 const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
455
456 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
457 return 0;
458
459 if (list && size <= list_len)
460 memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
461 return size;
462}
463
Christoph Hellwig431547b2009-11-13 09:52:56 +0000464static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name,
465 void *buffer, size_t size, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800466{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000467 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800468 struct posix_acl *acl;
469 int ret;
470
Christoph Hellwig431547b2009-11-13 09:52:56 +0000471 if (strcmp(name, "") != 0)
472 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800473 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
474 return -EOPNOTSUPP;
475
Christoph Hellwig431547b2009-11-13 09:52:56 +0000476 acl = ocfs2_get_acl(dentry->d_inode, type);
Tiger Yang929fb012008-11-14 11:17:04 +0800477 if (IS_ERR(acl))
478 return PTR_ERR(acl);
479 if (acl == NULL)
480 return -ENODATA;
481 ret = posix_acl_to_xattr(acl, buffer, size);
482 posix_acl_release(acl);
483
484 return ret;
485}
486
Christoph Hellwig431547b2009-11-13 09:52:56 +0000487static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name,
488 const void *value, size_t size, int flags, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800489{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000490 struct inode *inode = dentry->d_inode;
Tiger Yang929fb012008-11-14 11:17:04 +0800491 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
492 struct posix_acl *acl;
493 int ret = 0;
494
Christoph Hellwig431547b2009-11-13 09:52:56 +0000495 if (strcmp(name, "") != 0)
496 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800497 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
498 return -EOPNOTSUPP;
499
500 if (!is_owner_or_cap(inode))
501 return -EPERM;
502
503 if (value) {
504 acl = posix_acl_from_xattr(value, size);
505 if (IS_ERR(acl))
506 return PTR_ERR(acl);
507 else if (acl) {
508 ret = posix_acl_valid(acl);
509 if (ret)
510 goto cleanup;
511 }
512 } else
513 acl = NULL;
514
515 ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
516
517cleanup:
518 posix_acl_release(acl);
519 return ret;
520}
521
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700522const struct xattr_handler ocfs2_xattr_acl_access_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800523 .prefix = POSIX_ACL_XATTR_ACCESS,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000524 .flags = ACL_TYPE_ACCESS,
Tiger Yang929fb012008-11-14 11:17:04 +0800525 .list = ocfs2_xattr_list_acl_access,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000526 .get = ocfs2_xattr_get_acl,
527 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800528};
529
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700530const struct xattr_handler ocfs2_xattr_acl_default_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800531 .prefix = POSIX_ACL_XATTR_DEFAULT,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000532 .flags = ACL_TYPE_DEFAULT,
Tiger Yang929fb012008-11-14 11:17:04 +0800533 .list = ocfs2_xattr_list_acl_default,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000534 .get = ocfs2_xattr_get_acl,
535 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800536};