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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);
Eric W. Biederman95227512013-01-31 04:49:40 -080068 switch(acl->a_entries[n].e_tag) {
69 case ACL_USER:
70 acl->a_entries[n].e_uid =
71 make_kuid(&init_user_ns,
72 le32_to_cpu(entry->e_id));
73 break;
74 case ACL_GROUP:
75 acl->a_entries[n].e_gid =
76 make_kgid(&init_user_ns,
77 le32_to_cpu(entry->e_id));
78 break;
79 default:
80 break;
81 }
Tiger Yang929fb012008-11-14 11:17:04 +080082 value += sizeof(struct posix_acl_entry);
83
84 }
85 return acl;
86}
87
88/*
89 * Convert acl struct to xattr value.
90 */
91static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
92{
93 struct ocfs2_acl_entry *entry = NULL;
94 char *ocfs2_acl;
95 size_t n;
96
97 *size = acl->a_count * sizeof(struct posix_acl_entry);
98
99 ocfs2_acl = kmalloc(*size, GFP_NOFS);
100 if (!ocfs2_acl)
101 return ERR_PTR(-ENOMEM);
102
103 entry = (struct ocfs2_acl_entry *)ocfs2_acl;
104 for (n = 0; n < acl->a_count; n++, entry++) {
105 entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
106 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
Eric W. Biederman95227512013-01-31 04:49:40 -0800107 switch(acl->a_entries[n].e_tag) {
108 case ACL_USER:
109 entry->e_id = cpu_to_le32(
110 from_kuid(&init_user_ns,
111 acl->a_entries[n].e_uid));
112 break;
113 case ACL_GROUP:
114 entry->e_id = cpu_to_le32(
115 from_kgid(&init_user_ns,
116 acl->a_entries[n].e_gid));
117 break;
118 default:
119 entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
120 break;
121 }
Tiger Yang929fb012008-11-14 11:17:04 +0800122 }
123 return ocfs2_acl;
124}
125
126static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
127 int type,
128 struct buffer_head *di_bh)
129{
Tiger Yang929fb012008-11-14 11:17:04 +0800130 int name_index;
131 char *value = NULL;
132 struct posix_acl *acl;
133 int retval;
134
Tiger Yang929fb012008-11-14 11:17:04 +0800135 switch (type) {
136 case ACL_TYPE_ACCESS:
137 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
138 break;
139 case ACL_TYPE_DEFAULT:
140 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
141 break;
142 default:
143 return ERR_PTR(-EINVAL);
144 }
145
146 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
147 if (retval > 0) {
148 value = kmalloc(retval, GFP_NOFS);
149 if (!value)
150 return ERR_PTR(-ENOMEM);
151 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
152 "", value, retval);
153 }
154
155 if (retval > 0)
156 acl = ocfs2_acl_from_xattr(value, retval);
157 else if (retval == -ENODATA || retval == 0)
158 acl = NULL;
159 else
160 acl = ERR_PTR(retval);
161
162 kfree(value);
163
164 return acl;
165}
166
167
168/*
169 * Get posix acl.
170 */
171static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
172{
173 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
174 struct buffer_head *di_bh = NULL;
175 struct posix_acl *acl;
176 int ret;
177
178 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
179 return NULL;
180
181 ret = ocfs2_inode_lock(inode, &di_bh, 0);
182 if (ret < 0) {
183 mlog_errno(ret);
184 acl = ERR_PTR(ret);
185 return acl;
186 }
187
188 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
189
190 ocfs2_inode_unlock(inode, 0);
191
192 brelse(di_bh);
193
194 return acl;
195}
196
197/*
Mark Fashehfcefd252010-03-15 15:39:00 -0700198 * Helper function to set i_mode in memory and disk. Some call paths
199 * will not have di_bh or a journal handle to pass, in which case it
200 * will create it's own.
201 */
202static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
203 handle_t *handle, umode_t new_mode)
204{
205 int ret, commit_handle = 0;
206 struct ocfs2_dinode *di;
207
208 if (di_bh == NULL) {
209 ret = ocfs2_read_inode_block(inode, &di_bh);
210 if (ret) {
211 mlog_errno(ret);
212 goto out;
213 }
214 } else
215 get_bh(di_bh);
216
217 if (handle == NULL) {
218 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
219 OCFS2_INODE_UPDATE_CREDITS);
220 if (IS_ERR(handle)) {
221 ret = PTR_ERR(handle);
222 mlog_errno(ret);
223 goto out_brelse;
224 }
225
226 commit_handle = 1;
227 }
228
229 di = (struct ocfs2_dinode *)di_bh->b_data;
230 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
231 OCFS2_JOURNAL_ACCESS_WRITE);
232 if (ret) {
233 mlog_errno(ret);
234 goto out_commit;
235 }
236
237 inode->i_mode = new_mode;
Tao Ma12828062010-09-13 14:00:23 +0800238 inode->i_ctime = CURRENT_TIME;
Mark Fashehfcefd252010-03-15 15:39:00 -0700239 di->i_mode = cpu_to_le16(inode->i_mode);
Tao Ma12828062010-09-13 14:00:23 +0800240 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
241 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
Mark Fashehfcefd252010-03-15 15:39:00 -0700242
243 ocfs2_journal_dirty(handle, di_bh);
244
245out_commit:
246 if (commit_handle)
247 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
248out_brelse:
249 brelse(di_bh);
250out:
251 return ret;
252}
253
254/*
Tiger Yang929fb012008-11-14 11:17:04 +0800255 * Set the access or default ACL of an inode.
256 */
257static int ocfs2_set_acl(handle_t *handle,
258 struct inode *inode,
259 struct buffer_head *di_bh,
260 int type,
261 struct posix_acl *acl,
262 struct ocfs2_alloc_context *meta_ac,
263 struct ocfs2_alloc_context *data_ac)
264{
265 int name_index;
266 void *value = NULL;
267 size_t size = 0;
268 int ret;
269
270 if (S_ISLNK(inode->i_mode))
271 return -EOPNOTSUPP;
272
273 switch (type) {
274 case ACL_TYPE_ACCESS:
275 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
276 if (acl) {
Al Virod6952122011-07-23 18:56:36 -0400277 umode_t mode = inode->i_mode;
Tiger Yang929fb012008-11-14 11:17:04 +0800278 ret = posix_acl_equiv_mode(acl, &mode);
279 if (ret < 0)
280 return ret;
281 else {
Tiger Yang929fb012008-11-14 11:17:04 +0800282 if (ret == 0)
283 acl = NULL;
Mark Fashehfcefd252010-03-15 15:39:00 -0700284
285 ret = ocfs2_acl_set_mode(inode, di_bh,
286 handle, mode);
287 if (ret)
288 return ret;
289
Tiger Yang929fb012008-11-14 11:17:04 +0800290 }
291 }
292 break;
293 case ACL_TYPE_DEFAULT:
294 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
295 if (!S_ISDIR(inode->i_mode))
296 return acl ? -EACCES : 0;
297 break;
298 default:
299 return -EINVAL;
300 }
301
302 if (acl) {
303 value = ocfs2_acl_to_xattr(acl, &size);
304 if (IS_ERR(value))
305 return (int)PTR_ERR(value);
306 }
307
308 if (handle)
309 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
310 "", value, size, 0,
311 meta_ac, data_ac);
312 else
313 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
314
315 kfree(value);
316
317 return ret;
318}
319
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200320struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
Tiger Yang23fc2702008-11-14 11:17:18 +0800321{
Nick Pigginb74c79e2011-01-07 17:49:58 +1100322 struct ocfs2_super *osb;
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800323 struct buffer_head *di_bh = NULL;
324 struct posix_acl *acl;
325 int ret = -EAGAIN;
Tiger Yang23fc2702008-11-14 11:17:18 +0800326
Nick Pigginb74c79e2011-01-07 17:49:58 +1100327 osb = OCFS2_SB(inode->i_sb);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800328 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200329 return NULL;
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800330
331 ret = ocfs2_read_inode_block(inode, &di_bh);
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200332 if (ret < 0)
333 return ERR_PTR(ret);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800334
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200335 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800336
337 brelse(di_bh);
338
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200339 return acl;
Tiger Yang23fc2702008-11-14 11:17:18 +0800340}
341
Tiger Yang060bc662008-11-14 11:17:29 +0800342int ocfs2_acl_chmod(struct inode *inode)
343{
344 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Al Virobc26ab52011-07-23 00:18:02 -0400345 struct posix_acl *acl;
Tiger Yang060bc662008-11-14 11:17:29 +0800346 int ret;
347
348 if (S_ISLNK(inode->i_mode))
349 return -EOPNOTSUPP;
350
351 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
352 return 0;
353
354 acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
355 if (IS_ERR(acl) || !acl)
356 return PTR_ERR(acl);
Al Virobc26ab52011-07-23 00:18:02 -0400357 ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
358 if (ret)
359 return ret;
360 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
361 acl, NULL, NULL);
Tiger Yang060bc662008-11-14 11:17:29 +0800362 posix_acl_release(acl);
Tiger Yang060bc662008-11-14 11:17:29 +0800363 return ret;
364}
365
Tiger Yang89c38bd2008-11-14 11:17:41 +0800366/*
367 * Initialize the ACLs of a new inode. If parent directory has default ACL,
368 * then clone to new inode. Called from ocfs2_mknod.
369 */
370int ocfs2_init_acl(handle_t *handle,
371 struct inode *inode,
372 struct inode *dir,
373 struct buffer_head *di_bh,
374 struct buffer_head *dir_bh,
375 struct ocfs2_alloc_context *meta_ac,
376 struct ocfs2_alloc_context *data_ac)
377{
378 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
379 struct posix_acl *acl = NULL;
Tiger Yang6eda3dd2010-07-16 11:21:23 +0800380 int ret = 0, ret2;
Al Virod3fb6122011-07-23 18:37:50 -0400381 umode_t mode;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800382
383 if (!S_ISLNK(inode->i_mode)) {
384 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
385 acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
386 dir_bh);
387 if (IS_ERR(acl))
388 return PTR_ERR(acl);
389 }
Mark Fashehfcefd252010-03-15 15:39:00 -0700390 if (!acl) {
391 mode = inode->i_mode & ~current_umask();
392 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
393 if (ret) {
394 mlog_errno(ret);
395 goto cleanup;
396 }
397 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800398 }
399 if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
Tiger Yang89c38bd2008-11-14 11:17:41 +0800400 if (S_ISDIR(inode->i_mode)) {
401 ret = ocfs2_set_acl(handle, inode, di_bh,
402 ACL_TYPE_DEFAULT, acl,
403 meta_ac, data_ac);
404 if (ret)
405 goto cleanup;
406 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800407 mode = inode->i_mode;
Al Viro826cae22011-07-23 03:10:32 -0400408 ret = posix_acl_create(&acl, GFP_NOFS, &mode);
409 if (ret < 0)
410 return ret;
411
412 ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
413 if (ret2) {
414 mlog_errno(ret2);
415 ret = ret2;
416 goto cleanup;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800417 }
Al Viro826cae22011-07-23 03:10:32 -0400418 if (ret > 0) {
419 ret = ocfs2_set_acl(handle, inode,
420 di_bh, ACL_TYPE_ACCESS,
421 acl, meta_ac, data_ac);
422 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800423 }
424cleanup:
425 posix_acl_release(acl);
426 return ret;
427}
428
Christoph Hellwig431547b2009-11-13 09:52:56 +0000429static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800430 char *list,
431 size_t list_len,
432 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000433 size_t name_len,
434 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800435{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000436 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800437 const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
438
439 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
440 return 0;
441
442 if (list && size <= list_len)
443 memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
444 return size;
445}
446
Christoph Hellwig431547b2009-11-13 09:52:56 +0000447static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800448 char *list,
449 size_t list_len,
450 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000451 size_t name_len,
452 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800453{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000454 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800455 const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
456
457 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
458 return 0;
459
460 if (list && size <= list_len)
461 memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
462 return size;
463}
464
Christoph Hellwig431547b2009-11-13 09:52:56 +0000465static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name,
466 void *buffer, size_t size, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800467{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000468 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800469 struct posix_acl *acl;
470 int ret;
471
Christoph Hellwig431547b2009-11-13 09:52:56 +0000472 if (strcmp(name, "") != 0)
473 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800474 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
475 return -EOPNOTSUPP;
476
Christoph Hellwig431547b2009-11-13 09:52:56 +0000477 acl = ocfs2_get_acl(dentry->d_inode, type);
Tiger Yang929fb012008-11-14 11:17:04 +0800478 if (IS_ERR(acl))
479 return PTR_ERR(acl);
480 if (acl == NULL)
481 return -ENODATA;
Eric W. Biederman5f3a4a282012-09-10 20:17:44 -0700482 ret = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
Tiger Yang929fb012008-11-14 11:17:04 +0800483 posix_acl_release(acl);
484
485 return ret;
486}
487
Christoph Hellwig431547b2009-11-13 09:52:56 +0000488static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name,
489 const void *value, size_t size, int flags, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800490{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000491 struct inode *inode = dentry->d_inode;
Tiger Yang929fb012008-11-14 11:17:04 +0800492 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
493 struct posix_acl *acl;
494 int ret = 0;
495
Christoph Hellwig431547b2009-11-13 09:52:56 +0000496 if (strcmp(name, "") != 0)
497 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800498 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
499 return -EOPNOTSUPP;
500
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700501 if (!inode_owner_or_capable(inode))
Tiger Yang929fb012008-11-14 11:17:04 +0800502 return -EPERM;
503
504 if (value) {
Eric W. Biederman5f3a4a282012-09-10 20:17:44 -0700505 acl = posix_acl_from_xattr(&init_user_ns, value, size);
Tiger Yang929fb012008-11-14 11:17:04 +0800506 if (IS_ERR(acl))
507 return PTR_ERR(acl);
508 else if (acl) {
509 ret = posix_acl_valid(acl);
510 if (ret)
511 goto cleanup;
512 }
513 } else
514 acl = NULL;
515
516 ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
517
518cleanup:
519 posix_acl_release(acl);
520 return ret;
521}
522
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700523const struct xattr_handler ocfs2_xattr_acl_access_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800524 .prefix = POSIX_ACL_XATTR_ACCESS,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000525 .flags = ACL_TYPE_ACCESS,
Tiger Yang929fb012008-11-14 11:17:04 +0800526 .list = ocfs2_xattr_list_acl_access,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000527 .get = ocfs2_xattr_get_acl,
528 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800529};
530
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700531const struct xattr_handler ocfs2_xattr_acl_default_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800532 .prefix = POSIX_ACL_XATTR_DEFAULT,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000533 .flags = ACL_TYPE_DEFAULT,
Tiger Yang929fb012008-11-14 11:17:04 +0800534 .list = ocfs2_xattr_list_acl_default,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000535 .get = ocfs2_xattr_get_acl,
536 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800537};