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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
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;
212 di->i_mode = cpu_to_le16(inode->i_mode);
213
214 ocfs2_journal_dirty(handle, di_bh);
215
216out_commit:
217 if (commit_handle)
218 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
219out_brelse:
220 brelse(di_bh);
221out:
222 return ret;
223}
224
225/*
Tiger Yang929fb012008-11-14 11:17:04 +0800226 * Set the access or default ACL of an inode.
227 */
228static int ocfs2_set_acl(handle_t *handle,
229 struct inode *inode,
230 struct buffer_head *di_bh,
231 int type,
232 struct posix_acl *acl,
233 struct ocfs2_alloc_context *meta_ac,
234 struct ocfs2_alloc_context *data_ac)
235{
236 int name_index;
237 void *value = NULL;
238 size_t size = 0;
239 int ret;
240
241 if (S_ISLNK(inode->i_mode))
242 return -EOPNOTSUPP;
243
244 switch (type) {
245 case ACL_TYPE_ACCESS:
246 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
247 if (acl) {
248 mode_t mode = inode->i_mode;
249 ret = posix_acl_equiv_mode(acl, &mode);
250 if (ret < 0)
251 return ret;
252 else {
Tiger Yang929fb012008-11-14 11:17:04 +0800253 if (ret == 0)
254 acl = NULL;
Mark Fashehfcefd252010-03-15 15:39:00 -0700255
256 ret = ocfs2_acl_set_mode(inode, di_bh,
257 handle, mode);
258 if (ret)
259 return ret;
260
Tiger Yang929fb012008-11-14 11:17:04 +0800261 }
262 }
263 break;
264 case ACL_TYPE_DEFAULT:
265 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
266 if (!S_ISDIR(inode->i_mode))
267 return acl ? -EACCES : 0;
268 break;
269 default:
270 return -EINVAL;
271 }
272
273 if (acl) {
274 value = ocfs2_acl_to_xattr(acl, &size);
275 if (IS_ERR(value))
276 return (int)PTR_ERR(value);
277 }
278
279 if (handle)
280 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
281 "", value, size, 0,
282 meta_ac, data_ac);
283 else
284 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
285
286 kfree(value);
287
288 return ret;
289}
290
Tiger Yang23fc2702008-11-14 11:17:18 +0800291int ocfs2_check_acl(struct inode *inode, int mask)
292{
293 struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
294
295 if (IS_ERR(acl))
296 return PTR_ERR(acl);
297 if (acl) {
298 int ret = posix_acl_permission(inode, acl, mask);
299 posix_acl_release(acl);
300 return ret;
301 }
302
303 return -EAGAIN;
304}
305
Tiger Yang060bc662008-11-14 11:17:29 +0800306int ocfs2_acl_chmod(struct inode *inode)
307{
308 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
309 struct posix_acl *acl, *clone;
310 int ret;
311
312 if (S_ISLNK(inode->i_mode))
313 return -EOPNOTSUPP;
314
315 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
316 return 0;
317
318 acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
319 if (IS_ERR(acl) || !acl)
320 return PTR_ERR(acl);
321 clone = posix_acl_clone(acl, GFP_KERNEL);
322 posix_acl_release(acl);
323 if (!clone)
324 return -ENOMEM;
325 ret = posix_acl_chmod_masq(clone, inode->i_mode);
326 if (!ret)
327 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
328 clone, NULL, NULL);
329 posix_acl_release(clone);
330 return ret;
331}
332
Tiger Yang89c38bd2008-11-14 11:17:41 +0800333/*
334 * Initialize the ACLs of a new inode. If parent directory has default ACL,
335 * then clone to new inode. Called from ocfs2_mknod.
336 */
337int ocfs2_init_acl(handle_t *handle,
338 struct inode *inode,
339 struct inode *dir,
340 struct buffer_head *di_bh,
341 struct buffer_head *dir_bh,
342 struct ocfs2_alloc_context *meta_ac,
343 struct ocfs2_alloc_context *data_ac)
344{
345 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
346 struct posix_acl *acl = NULL;
347 int ret = 0;
Mark Fashehfcefd252010-03-15 15:39:00 -0700348 mode_t mode;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800349
350 if (!S_ISLNK(inode->i_mode)) {
351 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
352 acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
353 dir_bh);
354 if (IS_ERR(acl))
355 return PTR_ERR(acl);
356 }
Mark Fashehfcefd252010-03-15 15:39:00 -0700357 if (!acl) {
358 mode = inode->i_mode & ~current_umask();
359 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
360 if (ret) {
361 mlog_errno(ret);
362 goto cleanup;
363 }
364 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800365 }
366 if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
367 struct posix_acl *clone;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800368
369 if (S_ISDIR(inode->i_mode)) {
370 ret = ocfs2_set_acl(handle, inode, di_bh,
371 ACL_TYPE_DEFAULT, acl,
372 meta_ac, data_ac);
373 if (ret)
374 goto cleanup;
375 }
376 clone = posix_acl_clone(acl, GFP_NOFS);
377 ret = -ENOMEM;
378 if (!clone)
379 goto cleanup;
380
381 mode = inode->i_mode;
382 ret = posix_acl_create_masq(clone, &mode);
383 if (ret >= 0) {
Mark Fashehfcefd252010-03-15 15:39:00 -0700384 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
Tiger Yang89c38bd2008-11-14 11:17:41 +0800385 if (ret > 0) {
386 ret = ocfs2_set_acl(handle, inode,
387 di_bh, ACL_TYPE_ACCESS,
388 clone, meta_ac, data_ac);
389 }
390 }
391 posix_acl_release(clone);
392 }
393cleanup:
394 posix_acl_release(acl);
395 return ret;
396}
397
Christoph Hellwig431547b2009-11-13 09:52:56 +0000398static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800399 char *list,
400 size_t list_len,
401 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000402 size_t name_len,
403 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800404{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000405 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800406 const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
407
408 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
409 return 0;
410
411 if (list && size <= list_len)
412 memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
413 return size;
414}
415
Christoph Hellwig431547b2009-11-13 09:52:56 +0000416static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800417 char *list,
418 size_t list_len,
419 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000420 size_t name_len,
421 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800422{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000423 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800424 const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
425
426 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
427 return 0;
428
429 if (list && size <= list_len)
430 memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
431 return size;
432}
433
Christoph Hellwig431547b2009-11-13 09:52:56 +0000434static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name,
435 void *buffer, size_t size, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800436{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000437 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800438 struct posix_acl *acl;
439 int ret;
440
Christoph Hellwig431547b2009-11-13 09:52:56 +0000441 if (strcmp(name, "") != 0)
442 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800443 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
444 return -EOPNOTSUPP;
445
Christoph Hellwig431547b2009-11-13 09:52:56 +0000446 acl = ocfs2_get_acl(dentry->d_inode, type);
Tiger Yang929fb012008-11-14 11:17:04 +0800447 if (IS_ERR(acl))
448 return PTR_ERR(acl);
449 if (acl == NULL)
450 return -ENODATA;
451 ret = posix_acl_to_xattr(acl, buffer, size);
452 posix_acl_release(acl);
453
454 return ret;
455}
456
Christoph Hellwig431547b2009-11-13 09:52:56 +0000457static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name,
458 const void *value, size_t size, int flags, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800459{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000460 struct inode *inode = dentry->d_inode;
Tiger Yang929fb012008-11-14 11:17:04 +0800461 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
462 struct posix_acl *acl;
463 int ret = 0;
464
Christoph Hellwig431547b2009-11-13 09:52:56 +0000465 if (strcmp(name, "") != 0)
466 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800467 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
468 return -EOPNOTSUPP;
469
470 if (!is_owner_or_cap(inode))
471 return -EPERM;
472
473 if (value) {
474 acl = posix_acl_from_xattr(value, size);
475 if (IS_ERR(acl))
476 return PTR_ERR(acl);
477 else if (acl) {
478 ret = posix_acl_valid(acl);
479 if (ret)
480 goto cleanup;
481 }
482 } else
483 acl = NULL;
484
485 ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
486
487cleanup:
488 posix_acl_release(acl);
489 return ret;
490}
491
Tiger Yang929fb012008-11-14 11:17:04 +0800492struct xattr_handler ocfs2_xattr_acl_access_handler = {
493 .prefix = POSIX_ACL_XATTR_ACCESS,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000494 .flags = ACL_TYPE_ACCESS,
Tiger Yang929fb012008-11-14 11:17:04 +0800495 .list = ocfs2_xattr_list_acl_access,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000496 .get = ocfs2_xattr_get_acl,
497 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800498};
499
500struct xattr_handler ocfs2_xattr_acl_default_handler = {
501 .prefix = POSIX_ACL_XATTR_DEFAULT,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000502 .flags = ACL_TYPE_DEFAULT,
Tiger Yang929fb012008-11-14 11:17:04 +0800503 .list = ocfs2_xattr_list_acl_default,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000504 .get = ocfs2_xattr_get_acl,
505 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800506};