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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/sched/mm.h>
13#include <linux/slab.h>
14#include "ctree.h"
15#include "btrfs_inode.h"
16#include "xattr.h"
17#include "acl.h"
18
19struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu)
20{
21 int size;
22 const char *name;
23 char *value = NULL;
24 struct posix_acl *acl;
25
26 if (rcu)
27 return ERR_PTR(-ECHILD);
28
29 switch (type) {
30 case ACL_TYPE_ACCESS:
31 name = XATTR_NAME_POSIX_ACL_ACCESS;
32 break;
33 case ACL_TYPE_DEFAULT:
34 name = XATTR_NAME_POSIX_ACL_DEFAULT;
35 break;
36 default:
37 return ERR_PTR(-EINVAL);
38 }
39
40 size = btrfs_getxattr(inode, name, NULL, 0);
41 if (size > 0) {
42 value = kzalloc(size, GFP_KERNEL);
43 if (!value)
44 return ERR_PTR(-ENOMEM);
45 size = btrfs_getxattr(inode, name, value, size);
46 }
47 if (size > 0)
48 acl = posix_acl_from_xattr(&init_user_ns, value, size);
49 else if (size == -ENODATA || size == 0)
50 acl = NULL;
51 else
52 acl = ERR_PTR(size);
53 kfree(value);
54
55 return acl;
56}
57
58int __btrfs_set_acl(struct btrfs_trans_handle *trans, struct inode *inode,
59 struct posix_acl *acl, int type)
60{
61 int ret, size = 0;
62 const char *name;
63 char *value = NULL;
64
65 switch (type) {
66 case ACL_TYPE_ACCESS:
67 name = XATTR_NAME_POSIX_ACL_ACCESS;
68 break;
69 case ACL_TYPE_DEFAULT:
70 if (!S_ISDIR(inode->i_mode))
71 return acl ? -EINVAL : 0;
72 name = XATTR_NAME_POSIX_ACL_DEFAULT;
73 break;
74 default:
75 return -EINVAL;
76 }
77
78 if (acl) {
79 unsigned int nofs_flag;
80
81 size = posix_acl_xattr_size(acl->a_count);
82 /*
83 * We're holding a transaction handle, so use a NOFS memory
84 * allocation context to avoid deadlock if reclaim happens.
85 */
86 nofs_flag = memalloc_nofs_save();
87 value = kmalloc(size, GFP_KERNEL);
88 memalloc_nofs_restore(nofs_flag);
89 if (!value) {
90 ret = -ENOMEM;
91 goto out;
92 }
93
94 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
95 if (ret < 0)
96 goto out;
97 }
98
99 if (trans)
100 ret = btrfs_setxattr(trans, inode, name, value, size, 0);
101 else
102 ret = btrfs_setxattr_trans(inode, name, value, size, 0);
103
104out:
105 kfree(value);
106
107 if (!ret)
108 set_cached_acl(inode, type, acl);
109
110 return ret;
111}
112
113int btrfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
114 struct posix_acl *acl, int type)
115{
116 int ret;
117 struct inode *inode = d_inode(dentry);
118 umode_t old_mode = inode->i_mode;
119
120 if (type == ACL_TYPE_ACCESS && acl) {
121 ret = posix_acl_update_mode(idmap, inode,
122 &inode->i_mode, &acl);
123 if (ret)
124 return ret;
125 }
126 ret = __btrfs_set_acl(NULL, inode, acl, type);
127 if (ret)
128 inode->i_mode = old_mode;
129 return ret;
130}
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/sched/mm.h>
13#include <linux/slab.h>
14#include "ctree.h"
15#include "xattr.h"
16#include "acl.h"
17
18struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu)
19{
20 int size;
21 const char *name;
22 char *value = NULL;
23 struct posix_acl *acl;
24
25 if (rcu)
26 return ERR_PTR(-ECHILD);
27
28 switch (type) {
29 case ACL_TYPE_ACCESS:
30 name = XATTR_NAME_POSIX_ACL_ACCESS;
31 break;
32 case ACL_TYPE_DEFAULT:
33 name = XATTR_NAME_POSIX_ACL_DEFAULT;
34 break;
35 default:
36 return ERR_PTR(-EINVAL);
37 }
38
39 size = btrfs_getxattr(inode, name, NULL, 0);
40 if (size > 0) {
41 value = kzalloc(size, GFP_KERNEL);
42 if (!value)
43 return ERR_PTR(-ENOMEM);
44 size = btrfs_getxattr(inode, name, value, size);
45 }
46 if (size > 0)
47 acl = posix_acl_from_xattr(&init_user_ns, value, size);
48 else if (size == -ENODATA || size == 0)
49 acl = NULL;
50 else
51 acl = ERR_PTR(size);
52 kfree(value);
53
54 return acl;
55}
56
57int __btrfs_set_acl(struct btrfs_trans_handle *trans, struct inode *inode,
58 struct posix_acl *acl, int type)
59{
60 int ret, size = 0;
61 const char *name;
62 char *value = NULL;
63
64 switch (type) {
65 case ACL_TYPE_ACCESS:
66 name = XATTR_NAME_POSIX_ACL_ACCESS;
67 break;
68 case ACL_TYPE_DEFAULT:
69 if (!S_ISDIR(inode->i_mode))
70 return acl ? -EINVAL : 0;
71 name = XATTR_NAME_POSIX_ACL_DEFAULT;
72 break;
73 default:
74 return -EINVAL;
75 }
76
77 if (acl) {
78 unsigned int nofs_flag;
79
80 size = posix_acl_xattr_size(acl->a_count);
81 /*
82 * We're holding a transaction handle, so use a NOFS memory
83 * allocation context to avoid deadlock if reclaim happens.
84 */
85 nofs_flag = memalloc_nofs_save();
86 value = kmalloc(size, GFP_KERNEL);
87 memalloc_nofs_restore(nofs_flag);
88 if (!value) {
89 ret = -ENOMEM;
90 goto out;
91 }
92
93 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
94 if (ret < 0)
95 goto out;
96 }
97
98 if (trans)
99 ret = btrfs_setxattr(trans, inode, name, value, size, 0);
100 else
101 ret = btrfs_setxattr_trans(inode, name, value, size, 0);
102
103out:
104 kfree(value);
105
106 if (!ret)
107 set_cached_acl(inode, type, acl);
108
109 return ret;
110}
111
112int btrfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
113 struct posix_acl *acl, int type)
114{
115 int ret;
116 struct inode *inode = d_inode(dentry);
117 umode_t old_mode = inode->i_mode;
118
119 if (type == ACL_TYPE_ACCESS && acl) {
120 ret = posix_acl_update_mode(idmap, inode,
121 &inode->i_mode, &acl);
122 if (ret)
123 return ret;
124 }
125 ret = __btrfs_set_acl(NULL, inode, acl, type);
126 if (ret)
127 inode->i_mode = old_mode;
128 return ret;
129}