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5103e947 JB |
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> | |
c1e32da6 | 23 | #include <linux/sched.h> |
5103e947 JB |
24 | #include "ctree.h" |
25 | #include "xattr.h" | |
fb4bc1e0 Y |
26 | #ifndef is_owner_or_cap |
27 | #define is_owner_or_cap(inode) \ | |
28 | ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER)) | |
29 | #endif | |
30 | ||
744f52f9 Y |
31 | static int btrfs_xattr_set_acl(struct inode *inode, int type, |
32 | const void *value, size_t size) | |
33 | { | |
34 | int ret = 0; | |
35 | struct posix_acl *acl; | |
5103e947 | 36 | |
744f52f9 Y |
37 | if (!is_owner_or_cap(inode)) |
38 | return -EPERM; | |
39 | if (value) { | |
40 | acl = posix_acl_from_xattr(value, size); | |
41 | if (acl == NULL) { | |
42 | value = NULL; | |
43 | size = 0; | |
44 | } else if (IS_ERR(acl)) { | |
45 | ret = PTR_ERR(acl); | |
46 | } else { | |
47 | ret = posix_acl_valid(acl); | |
48 | posix_acl_release(acl); | |
49 | } | |
50 | if (ret) | |
51 | return ret; | |
52 | } | |
53 | return btrfs_xattr_set(inode, type, "", value, size, 0); | |
54 | } | |
1caf9342 | 55 | |
744f52f9 Y |
56 | static int btrfs_xattr_get_acl(struct inode *inode, int type, |
57 | void *value, size_t size) | |
58 | { | |
59 | return btrfs_xattr_get(inode, type, "", value, size); | |
60 | } | |
5103e947 JB |
61 | static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name, |
62 | void *value, size_t size) | |
63 | { | |
744f52f9 Y |
64 | if (*name != '\0') |
65 | return -EINVAL; | |
66 | return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS, | |
67 | value, size); | |
5103e947 | 68 | } |
5103e947 JB |
69 | static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name, |
70 | const void *value, size_t size, int flags) | |
71 | { | |
744f52f9 Y |
72 | if (*name != '\0') |
73 | return -EINVAL; | |
74 | return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS, | |
75 | value, size); | |
5103e947 | 76 | } |
5103e947 JB |
77 | static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name, |
78 | void *value, size_t size) | |
79 | { | |
744f52f9 Y |
80 | if (*name != '\0') |
81 | return -EINVAL; | |
82 | return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT, | |
83 | value, size); | |
5103e947 | 84 | } |
5103e947 JB |
85 | static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name, |
86 | const void *value, size_t size, int flags) | |
87 | { | |
744f52f9 Y |
88 | if (*name != '\0') |
89 | return -EINVAL; | |
90 | return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT, | |
91 | value, size); | |
5103e947 | 92 | } |
5103e947 JB |
93 | struct xattr_handler btrfs_xattr_acl_default_handler = { |
94 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
95 | .list = btrfs_xattr_generic_list, | |
96 | .get = btrfs_xattr_acl_default_get, | |
97 | .set = btrfs_xattr_acl_default_set, | |
98 | }; | |
99 | ||
100 | struct xattr_handler btrfs_xattr_acl_access_handler = { | |
101 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
102 | .list = btrfs_xattr_generic_list, | |
103 | .get = btrfs_xattr_acl_access_get, | |
104 | .set = btrfs_xattr_acl_access_set, | |
105 | }; |