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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2007 Red Hat. All rights reserved.
4 */
5
6#include <linux/fs.h>
7#include <linux/string.h>
8#include <linux/xattr.h>
9#include <linux/posix_acl_xattr.h>
10#include <linux/posix_acl.h>
11#include <linux/sched.h>
12#include <linux/slab.h>
13
14#include "ctree.h"
15#include "btrfs_inode.h"
16#include "xattr.h"
17
18struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
19{
20 int size;
21 const char *name;
22 char *value = NULL;
23 struct posix_acl *acl;
24
25 switch (type) {
26 case ACL_TYPE_ACCESS:
27 name = XATTR_NAME_POSIX_ACL_ACCESS;
28 break;
29 case ACL_TYPE_DEFAULT:
30 name = XATTR_NAME_POSIX_ACL_DEFAULT;
31 break;
32 default:
33 BUG();
34 }
35
36 size = btrfs_getxattr(inode, name, "", 0);
37 if (size > 0) {
38 value = kzalloc(size, GFP_KERNEL);
39 if (!value)
40 return ERR_PTR(-ENOMEM);
41 size = btrfs_getxattr(inode, name, value, size);
42 }
43 if (size > 0) {
44 acl = posix_acl_from_xattr(&init_user_ns, value, size);
45 } else if (size == -ERANGE || size == -ENODATA || size == 0) {
46 acl = NULL;
47 } else {
48 acl = ERR_PTR(-EIO);
49 }
50 kfree(value);
51
52 return acl;
53}
54
55static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
56 struct inode *inode, struct posix_acl *acl, int type)
57{
58 int ret, size = 0;
59 const char *name;
60 char *value = NULL;
61
62 switch (type) {
63 case ACL_TYPE_ACCESS:
64 name = XATTR_NAME_POSIX_ACL_ACCESS;
65 break;
66 case ACL_TYPE_DEFAULT:
67 if (!S_ISDIR(inode->i_mode))
68 return acl ? -EINVAL : 0;
69 name = XATTR_NAME_POSIX_ACL_DEFAULT;
70 break;
71 default:
72 return -EINVAL;
73 }
74
75 if (acl) {
76 size = posix_acl_xattr_size(acl->a_count);
77 value = kmalloc(size, GFP_KERNEL);
78 if (!value) {
79 ret = -ENOMEM;
80 goto out;
81 }
82
83 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
84 if (ret < 0)
85 goto out;
86 }
87
88 ret = btrfs_setxattr(trans, inode, name, value, size, 0);
89out:
90 kfree(value);
91
92 if (!ret)
93 set_cached_acl(inode, type, acl);
94
95 return ret;
96}
97
98int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
99{
100 int ret;
101 umode_t old_mode = inode->i_mode;
102
103 if (type == ACL_TYPE_ACCESS && acl) {
104 ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
105 if (ret)
106 return ret;
107 }
108 ret = __btrfs_set_acl(NULL, inode, acl, type);
109 if (ret)
110 inode->i_mode = old_mode;
111 return ret;
112}
113
114int btrfs_init_acl(struct btrfs_trans_handle *trans,
115 struct inode *inode, struct inode *dir)
116{
117 struct posix_acl *default_acl, *acl;
118 int ret = 0;
119
120 /* this happens with subvols */
121 if (!dir)
122 return 0;
123
124 ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
125 if (ret)
126 return ret;
127
128 if (default_acl) {
129 ret = __btrfs_set_acl(trans, inode, default_acl,
130 ACL_TYPE_DEFAULT);
131 posix_acl_release(default_acl);
132 }
133
134 if (acl) {
135 if (!ret)
136 ret = __btrfs_set_acl(trans, inode, acl,
137 ACL_TYPE_ACCESS);
138 posix_acl_release(acl);
139 }
140
141 if (!default_acl && !acl)
142 cache_no_acl(inode);
143 return ret;
144}
1/*
2 * Copyright (C) 2007 Red Hat. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/fs.h>
20#include <linux/string.h>
21#include <linux/xattr.h>
22#include <linux/posix_acl_xattr.h>
23#include <linux/posix_acl.h>
24#include <linux/sched.h>
25#include <linux/slab.h>
26
27#include "ctree.h"
28#include "btrfs_inode.h"
29#include "xattr.h"
30
31struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
32{
33 int size;
34 const char *name;
35 char *value = NULL;
36 struct posix_acl *acl;
37
38 switch (type) {
39 case ACL_TYPE_ACCESS:
40 name = POSIX_ACL_XATTR_ACCESS;
41 break;
42 case ACL_TYPE_DEFAULT:
43 name = POSIX_ACL_XATTR_DEFAULT;
44 break;
45 default:
46 BUG();
47 }
48
49 size = __btrfs_getxattr(inode, name, "", 0);
50 if (size > 0) {
51 value = kzalloc(size, GFP_NOFS);
52 if (!value)
53 return ERR_PTR(-ENOMEM);
54 size = __btrfs_getxattr(inode, name, value, size);
55 }
56 if (size > 0) {
57 acl = posix_acl_from_xattr(&init_user_ns, value, size);
58 } else if (size == -ENOENT || size == -ENODATA || size == 0) {
59 /* FIXME, who returns -ENOENT? I think nobody */
60 acl = NULL;
61 } else {
62 acl = ERR_PTR(-EIO);
63 }
64 kfree(value);
65
66 if (!IS_ERR(acl))
67 set_cached_acl(inode, type, acl);
68
69 return acl;
70}
71
72/*
73 * Needs to be called with fs_mutex held
74 */
75static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
76 struct inode *inode, struct posix_acl *acl, int type)
77{
78 int ret, size = 0;
79 const char *name;
80 char *value = NULL;
81
82 if (acl) {
83 ret = posix_acl_valid(acl);
84 if (ret < 0)
85 return ret;
86 ret = 0;
87 }
88
89 switch (type) {
90 case ACL_TYPE_ACCESS:
91 name = POSIX_ACL_XATTR_ACCESS;
92 if (acl) {
93 ret = posix_acl_equiv_mode(acl, &inode->i_mode);
94 if (ret < 0)
95 return ret;
96 if (ret == 0)
97 acl = NULL;
98 }
99 ret = 0;
100 break;
101 case ACL_TYPE_DEFAULT:
102 if (!S_ISDIR(inode->i_mode))
103 return acl ? -EINVAL : 0;
104 name = POSIX_ACL_XATTR_DEFAULT;
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 if (acl) {
111 size = posix_acl_xattr_size(acl->a_count);
112 value = kmalloc(size, GFP_NOFS);
113 if (!value) {
114 ret = -ENOMEM;
115 goto out;
116 }
117
118 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
119 if (ret < 0)
120 goto out;
121 }
122
123 ret = __btrfs_setxattr(trans, inode, name, value, size, 0);
124out:
125 kfree(value);
126
127 if (!ret)
128 set_cached_acl(inode, type, acl);
129
130 return ret;
131}
132
133int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
134{
135 return __btrfs_set_acl(NULL, inode, acl, type);
136}
137
138/*
139 * btrfs_init_acl is already generally called under fs_mutex, so the locking
140 * stuff has been fixed to work with that. If the locking stuff changes, we
141 * need to re-evaluate the acl locking stuff.
142 */
143int btrfs_init_acl(struct btrfs_trans_handle *trans,
144 struct inode *inode, struct inode *dir)
145{
146 struct posix_acl *default_acl, *acl;
147 int ret = 0;
148
149 /* this happens with subvols */
150 if (!dir)
151 return 0;
152
153 ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
154 if (ret)
155 return ret;
156
157 if (default_acl) {
158 ret = __btrfs_set_acl(trans, inode, default_acl,
159 ACL_TYPE_DEFAULT);
160 posix_acl_release(default_acl);
161 }
162
163 if (acl) {
164 if (!ret)
165 ret = __btrfs_set_acl(trans, inode, acl,
166 ACL_TYPE_ACCESS);
167 posix_acl_release(acl);
168 }
169
170 if (!default_acl && !acl)
171 cache_no_acl(inode);
172 return ret;
173}