blob: b4f788e0ca318955ab797f2350f8dffa320a53cb [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
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);
Tiger Yang929fb012008-11-14 11:17:04 +080054
55 acl = posix_acl_alloc(count, GFP_NOFS);
56 if (!acl)
57 return ERR_PTR(-ENOMEM);
58 for (n = 0; n < count; n++) {
59 struct ocfs2_acl_entry *entry =
60 (struct ocfs2_acl_entry *)value;
61
62 acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
63 acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
Eric W. Biederman95227512013-01-31 04:49:40 -080064 switch(acl->a_entries[n].e_tag) {
65 case ACL_USER:
66 acl->a_entries[n].e_uid =
67 make_kuid(&init_user_ns,
68 le32_to_cpu(entry->e_id));
69 break;
70 case ACL_GROUP:
71 acl->a_entries[n].e_gid =
72 make_kgid(&init_user_ns,
73 le32_to_cpu(entry->e_id));
74 break;
75 default:
76 break;
77 }
Tiger Yang929fb012008-11-14 11:17:04 +080078 value += sizeof(struct posix_acl_entry);
79
80 }
81 return acl;
82}
83
84/*
85 * Convert acl struct to xattr value.
86 */
87static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
88{
89 struct ocfs2_acl_entry *entry = NULL;
90 char *ocfs2_acl;
91 size_t n;
92
93 *size = acl->a_count * sizeof(struct posix_acl_entry);
94
95 ocfs2_acl = kmalloc(*size, GFP_NOFS);
96 if (!ocfs2_acl)
97 return ERR_PTR(-ENOMEM);
98
99 entry = (struct ocfs2_acl_entry *)ocfs2_acl;
100 for (n = 0; n < acl->a_count; n++, entry++) {
101 entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
102 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
Eric W. Biederman95227512013-01-31 04:49:40 -0800103 switch(acl->a_entries[n].e_tag) {
104 case ACL_USER:
105 entry->e_id = cpu_to_le32(
106 from_kuid(&init_user_ns,
107 acl->a_entries[n].e_uid));
108 break;
109 case ACL_GROUP:
110 entry->e_id = cpu_to_le32(
111 from_kgid(&init_user_ns,
112 acl->a_entries[n].e_gid));
113 break;
114 default:
115 entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
116 break;
117 }
Tiger Yang929fb012008-11-14 11:17:04 +0800118 }
119 return ocfs2_acl;
120}
121
122static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
123 int type,
124 struct buffer_head *di_bh)
125{
Tiger Yang929fb012008-11-14 11:17:04 +0800126 int name_index;
127 char *value = NULL;
128 struct posix_acl *acl;
129 int retval;
130
Tiger Yang929fb012008-11-14 11:17:04 +0800131 switch (type) {
132 case ACL_TYPE_ACCESS:
133 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
134 break;
135 case ACL_TYPE_DEFAULT:
136 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
137 break;
138 default:
139 return ERR_PTR(-EINVAL);
140 }
141
142 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
143 if (retval > 0) {
144 value = kmalloc(retval, GFP_NOFS);
145 if (!value)
146 return ERR_PTR(-ENOMEM);
147 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
148 "", value, retval);
149 }
150
151 if (retval > 0)
152 acl = ocfs2_acl_from_xattr(value, retval);
153 else if (retval == -ENODATA || retval == 0)
154 acl = NULL;
155 else
156 acl = ERR_PTR(retval);
157
158 kfree(value);
159
160 return acl;
161}
162
163
164/*
165 * Get posix acl.
166 */
167static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
168{
169 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
170 struct buffer_head *di_bh = NULL;
171 struct posix_acl *acl;
172 int ret;
173
174 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
175 return NULL;
176
177 ret = ocfs2_inode_lock(inode, &di_bh, 0);
178 if (ret < 0) {
179 mlog_errno(ret);
180 acl = ERR_PTR(ret);
181 return acl;
182 }
183
184 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
185
186 ocfs2_inode_unlock(inode, 0);
187
188 brelse(di_bh);
189
190 return acl;
191}
192
193/*
Mark Fashehfcefd252010-03-15 15:39:00 -0700194 * Helper function to set i_mode in memory and disk. Some call paths
195 * will not have di_bh or a journal handle to pass, in which case it
196 * will create it's own.
197 */
198static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
199 handle_t *handle, umode_t new_mode)
200{
201 int ret, commit_handle = 0;
202 struct ocfs2_dinode *di;
203
204 if (di_bh == NULL) {
205 ret = ocfs2_read_inode_block(inode, &di_bh);
206 if (ret) {
207 mlog_errno(ret);
208 goto out;
209 }
210 } else
211 get_bh(di_bh);
212
213 if (handle == NULL) {
214 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
215 OCFS2_INODE_UPDATE_CREDITS);
216 if (IS_ERR(handle)) {
217 ret = PTR_ERR(handle);
218 mlog_errno(ret);
219 goto out_brelse;
220 }
221
222 commit_handle = 1;
223 }
224
225 di = (struct ocfs2_dinode *)di_bh->b_data;
226 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
227 OCFS2_JOURNAL_ACCESS_WRITE);
228 if (ret) {
229 mlog_errno(ret);
230 goto out_commit;
231 }
232
233 inode->i_mode = new_mode;
Tao Ma12828062010-09-13 14:00:23 +0800234 inode->i_ctime = CURRENT_TIME;
Mark Fashehfcefd252010-03-15 15:39:00 -0700235 di->i_mode = cpu_to_le16(inode->i_mode);
Tao Ma12828062010-09-13 14:00:23 +0800236 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
237 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
Mark Fashehfcefd252010-03-15 15:39:00 -0700238
239 ocfs2_journal_dirty(handle, di_bh);
240
241out_commit:
242 if (commit_handle)
243 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
244out_brelse:
245 brelse(di_bh);
246out:
247 return ret;
248}
249
250/*
Tiger Yang929fb012008-11-14 11:17:04 +0800251 * Set the access or default ACL of an inode.
252 */
253static int ocfs2_set_acl(handle_t *handle,
254 struct inode *inode,
255 struct buffer_head *di_bh,
256 int type,
257 struct posix_acl *acl,
258 struct ocfs2_alloc_context *meta_ac,
259 struct ocfs2_alloc_context *data_ac)
260{
261 int name_index;
262 void *value = NULL;
263 size_t size = 0;
264 int ret;
265
266 if (S_ISLNK(inode->i_mode))
267 return -EOPNOTSUPP;
268
269 switch (type) {
270 case ACL_TYPE_ACCESS:
271 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
272 if (acl) {
Al Virod6952122011-07-23 18:56:36 -0400273 umode_t mode = inode->i_mode;
Tiger Yang929fb012008-11-14 11:17:04 +0800274 ret = posix_acl_equiv_mode(acl, &mode);
275 if (ret < 0)
276 return ret;
277 else {
Tiger Yang929fb012008-11-14 11:17:04 +0800278 if (ret == 0)
279 acl = NULL;
Mark Fashehfcefd252010-03-15 15:39:00 -0700280
281 ret = ocfs2_acl_set_mode(inode, di_bh,
282 handle, mode);
283 if (ret)
284 return ret;
285
Tiger Yang929fb012008-11-14 11:17:04 +0800286 }
287 }
288 break;
289 case ACL_TYPE_DEFAULT:
290 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
291 if (!S_ISDIR(inode->i_mode))
292 return acl ? -EACCES : 0;
293 break;
294 default:
295 return -EINVAL;
296 }
297
298 if (acl) {
299 value = ocfs2_acl_to_xattr(acl, &size);
300 if (IS_ERR(value))
301 return (int)PTR_ERR(value);
302 }
303
304 if (handle)
305 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
306 "", value, size, 0,
307 meta_ac, data_ac);
308 else
309 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
310
311 kfree(value);
312
313 return ret;
314}
315
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200316struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
Tiger Yang23fc2702008-11-14 11:17:18 +0800317{
Nick Pigginb74c79e2011-01-07 17:49:58 +1100318 struct ocfs2_super *osb;
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800319 struct buffer_head *di_bh = NULL;
320 struct posix_acl *acl;
321 int ret = -EAGAIN;
Tiger Yang23fc2702008-11-14 11:17:18 +0800322
Nick Pigginb74c79e2011-01-07 17:49:58 +1100323 osb = OCFS2_SB(inode->i_sb);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800324 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200325 return NULL;
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800326
327 ret = ocfs2_read_inode_block(inode, &di_bh);
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200328 if (ret < 0)
329 return ERR_PTR(ret);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800330
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200331 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
Jiaju Zhang845b6cf2010-07-28 13:21:06 +0800332
333 brelse(di_bh);
334
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200335 return acl;
Tiger Yang23fc2702008-11-14 11:17:18 +0800336}
337
Tiger Yang060bc662008-11-14 11:17:29 +0800338int ocfs2_acl_chmod(struct inode *inode)
339{
340 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Al Virobc26ab52011-07-23 00:18:02 -0400341 struct posix_acl *acl;
Tiger Yang060bc662008-11-14 11:17:29 +0800342 int ret;
343
344 if (S_ISLNK(inode->i_mode))
345 return -EOPNOTSUPP;
346
347 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
348 return 0;
349
350 acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
351 if (IS_ERR(acl) || !acl)
352 return PTR_ERR(acl);
Al Virobc26ab52011-07-23 00:18:02 -0400353 ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
354 if (ret)
355 return ret;
356 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
357 acl, NULL, NULL);
Tiger Yang060bc662008-11-14 11:17:29 +0800358 posix_acl_release(acl);
Tiger Yang060bc662008-11-14 11:17:29 +0800359 return ret;
360}
361
Tiger Yang89c38bd2008-11-14 11:17:41 +0800362/*
363 * Initialize the ACLs of a new inode. If parent directory has default ACL,
364 * then clone to new inode. Called from ocfs2_mknod.
365 */
366int ocfs2_init_acl(handle_t *handle,
367 struct inode *inode,
368 struct inode *dir,
369 struct buffer_head *di_bh,
370 struct buffer_head *dir_bh,
371 struct ocfs2_alloc_context *meta_ac,
372 struct ocfs2_alloc_context *data_ac)
373{
374 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
375 struct posix_acl *acl = NULL;
Tiger Yang6eda3dd2010-07-16 11:21:23 +0800376 int ret = 0, ret2;
Al Virod3fb6122011-07-23 18:37:50 -0400377 umode_t mode;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800378
379 if (!S_ISLNK(inode->i_mode)) {
380 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
381 acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
382 dir_bh);
383 if (IS_ERR(acl))
384 return PTR_ERR(acl);
385 }
Mark Fashehfcefd252010-03-15 15:39:00 -0700386 if (!acl) {
387 mode = inode->i_mode & ~current_umask();
388 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
389 if (ret) {
390 mlog_errno(ret);
391 goto cleanup;
392 }
393 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800394 }
395 if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
Tiger Yang89c38bd2008-11-14 11:17:41 +0800396 if (S_ISDIR(inode->i_mode)) {
397 ret = ocfs2_set_acl(handle, inode, di_bh,
398 ACL_TYPE_DEFAULT, acl,
399 meta_ac, data_ac);
400 if (ret)
401 goto cleanup;
402 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800403 mode = inode->i_mode;
Al Viro826cae22011-07-23 03:10:32 -0400404 ret = posix_acl_create(&acl, GFP_NOFS, &mode);
405 if (ret < 0)
406 return ret;
407
408 ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
409 if (ret2) {
410 mlog_errno(ret2);
411 ret = ret2;
412 goto cleanup;
Tiger Yang89c38bd2008-11-14 11:17:41 +0800413 }
Al Viro826cae22011-07-23 03:10:32 -0400414 if (ret > 0) {
415 ret = ocfs2_set_acl(handle, inode,
416 di_bh, ACL_TYPE_ACCESS,
417 acl, meta_ac, data_ac);
418 }
Tiger Yang89c38bd2008-11-14 11:17:41 +0800419 }
420cleanup:
421 posix_acl_release(acl);
422 return ret;
423}
424
Christoph Hellwig431547b2009-11-13 09:52:56 +0000425static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800426 char *list,
427 size_t list_len,
428 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000429 size_t name_len,
430 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800431{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000432 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800433 const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
434
435 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
436 return 0;
437
438 if (list && size <= list_len)
439 memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
440 return size;
441}
442
Christoph Hellwig431547b2009-11-13 09:52:56 +0000443static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
Tiger Yang929fb012008-11-14 11:17:04 +0800444 char *list,
445 size_t list_len,
446 const char *name,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000447 size_t name_len,
448 int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800449{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000450 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800451 const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
452
453 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
454 return 0;
455
456 if (list && size <= list_len)
457 memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
458 return size;
459}
460
Christoph Hellwig431547b2009-11-13 09:52:56 +0000461static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name,
462 void *buffer, size_t size, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800463{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000464 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
Tiger Yang929fb012008-11-14 11:17:04 +0800465 struct posix_acl *acl;
466 int ret;
467
Christoph Hellwig431547b2009-11-13 09:52:56 +0000468 if (strcmp(name, "") != 0)
469 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800470 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
471 return -EOPNOTSUPP;
472
Christoph Hellwig431547b2009-11-13 09:52:56 +0000473 acl = ocfs2_get_acl(dentry->d_inode, type);
Tiger Yang929fb012008-11-14 11:17:04 +0800474 if (IS_ERR(acl))
475 return PTR_ERR(acl);
476 if (acl == NULL)
477 return -ENODATA;
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -0700478 ret = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
Tiger Yang929fb012008-11-14 11:17:04 +0800479 posix_acl_release(acl);
480
481 return ret;
482}
483
Christoph Hellwig431547b2009-11-13 09:52:56 +0000484static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name,
485 const void *value, size_t size, int flags, int type)
Tiger Yang929fb012008-11-14 11:17:04 +0800486{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000487 struct inode *inode = dentry->d_inode;
Tiger Yang929fb012008-11-14 11:17:04 +0800488 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
489 struct posix_acl *acl;
490 int ret = 0;
491
Christoph Hellwig431547b2009-11-13 09:52:56 +0000492 if (strcmp(name, "") != 0)
493 return -EINVAL;
Tiger Yang929fb012008-11-14 11:17:04 +0800494 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
495 return -EOPNOTSUPP;
496
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700497 if (!inode_owner_or_capable(inode))
Tiger Yang929fb012008-11-14 11:17:04 +0800498 return -EPERM;
499
500 if (value) {
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -0700501 acl = posix_acl_from_xattr(&init_user_ns, value, size);
Tiger Yang929fb012008-11-14 11:17:04 +0800502 if (IS_ERR(acl))
503 return PTR_ERR(acl);
504 else if (acl) {
505 ret = posix_acl_valid(acl);
506 if (ret)
507 goto cleanup;
508 }
509 } else
510 acl = NULL;
511
512 ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
513
514cleanup:
515 posix_acl_release(acl);
516 return ret;
517}
518
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700519const struct xattr_handler ocfs2_xattr_acl_access_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800520 .prefix = POSIX_ACL_XATTR_ACCESS,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000521 .flags = ACL_TYPE_ACCESS,
Tiger Yang929fb012008-11-14 11:17:04 +0800522 .list = ocfs2_xattr_list_acl_access,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000523 .get = ocfs2_xattr_get_acl,
524 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800525};
526
Stephen Hemminger537d81c2010-05-13 17:53:22 -0700527const struct xattr_handler ocfs2_xattr_acl_default_handler = {
Tiger Yang929fb012008-11-14 11:17:04 +0800528 .prefix = POSIX_ACL_XATTR_DEFAULT,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000529 .flags = ACL_TYPE_DEFAULT,
Tiger Yang929fb012008-11-14 11:17:04 +0800530 .list = ocfs2_xattr_list_acl_default,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000531 .get = ocfs2_xattr_get_acl,
532 .set = ocfs2_xattr_set_acl,
Tiger Yang929fb012008-11-14 11:17:04 +0800533};