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Commit | Line | Data |
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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> | |
33268eaf | 23 | #include <linux/posix_acl.h> |
c1e32da6 | 24 | #include <linux/sched.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
33268eaf | 26 | |
5103e947 | 27 | #include "ctree.h" |
33268eaf | 28 | #include "btrfs_inode.h" |
5103e947 | 29 | #include "xattr.h" |
33268eaf | 30 | |
4e34e719 | 31 | struct posix_acl *btrfs_get_acl(struct inode *inode, int type) |
33268eaf | 32 | { |
95819c05 CH |
33 | int size; |
34 | const char *name; | |
33268eaf | 35 | char *value = NULL; |
073aaa1b AV |
36 | struct posix_acl *acl; |
37 | ||
33268eaf JB |
38 | switch (type) { |
39 | case ACL_TYPE_ACCESS: | |
97d79299 | 40 | name = XATTR_NAME_POSIX_ACL_ACCESS; |
33268eaf JB |
41 | break; |
42 | case ACL_TYPE_DEFAULT: | |
97d79299 | 43 | name = XATTR_NAME_POSIX_ACL_DEFAULT; |
33268eaf JB |
44 | break; |
45 | default: | |
073aaa1b | 46 | BUG(); |
33268eaf JB |
47 | } |
48 | ||
95819c05 | 49 | size = __btrfs_getxattr(inode, name, "", 0); |
33268eaf | 50 | if (size > 0) { |
39a27ec1 | 51 | value = kzalloc(size, GFP_KERNEL); |
33268eaf JB |
52 | if (!value) |
53 | return ERR_PTR(-ENOMEM); | |
95819c05 | 54 | size = __btrfs_getxattr(inode, name, value, size); |
cfbffc39 TI |
55 | } |
56 | if (size > 0) { | |
5f3a4a28 | 57 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
7b1a14bb CM |
58 | } else if (size == -ENOENT || size == -ENODATA || size == 0) { |
59 | /* FIXME, who returns -ENOENT? I think nobody */ | |
33268eaf | 60 | acl = NULL; |
7b1a14bb CM |
61 | } else { |
62 | acl = ERR_PTR(-EIO); | |
33268eaf | 63 | } |
cfbffc39 TI |
64 | kfree(value); |
65 | ||
33268eaf JB |
66 | return acl; |
67 | } | |
68 | ||
33268eaf JB |
69 | /* |
70 | * Needs to be called with fs_mutex held | |
71 | */ | |
996a710d | 72 | static int __btrfs_set_acl(struct btrfs_trans_handle *trans, |
f34f57a3 | 73 | struct inode *inode, struct posix_acl *acl, int type) |
33268eaf | 74 | { |
95819c05 CH |
75 | int ret, size = 0; |
76 | const char *name; | |
33268eaf | 77 | char *value = NULL; |
33268eaf | 78 | |
33268eaf JB |
79 | switch (type) { |
80 | case ACL_TYPE_ACCESS: | |
97d79299 | 81 | name = XATTR_NAME_POSIX_ACL_ACCESS; |
a9cc71a6 | 82 | if (acl) { |
d6952123 | 83 | ret = posix_acl_equiv_mode(acl, &inode->i_mode); |
a9cc71a6 CM |
84 | if (ret < 0) |
85 | return ret; | |
755ac67f LB |
86 | if (ret == 0) |
87 | acl = NULL; | |
a9cc71a6 CM |
88 | } |
89 | ret = 0; | |
33268eaf JB |
90 | break; |
91 | case ACL_TYPE_DEFAULT: | |
92 | if (!S_ISDIR(inode->i_mode)) | |
93 | return acl ? -EINVAL : 0; | |
97d79299 | 94 | name = XATTR_NAME_POSIX_ACL_DEFAULT; |
33268eaf JB |
95 | break; |
96 | default: | |
97 | return -EINVAL; | |
98 | } | |
99 | ||
100 | if (acl) { | |
101 | size = posix_acl_xattr_size(acl->a_count); | |
39a27ec1 | 102 | value = kmalloc(size, GFP_KERNEL); |
33268eaf JB |
103 | if (!value) { |
104 | ret = -ENOMEM; | |
105 | goto out; | |
106 | } | |
107 | ||
5f3a4a28 | 108 | ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); |
33268eaf JB |
109 | if (ret < 0) |
110 | goto out; | |
111 | } | |
112 | ||
f34f57a3 | 113 | ret = __btrfs_setxattr(trans, inode, name, value, size, 0); |
33268eaf | 114 | out: |
d397712b | 115 | kfree(value); |
33268eaf JB |
116 | |
117 | if (!ret) | |
073aaa1b | 118 | set_cached_acl(inode, type, acl); |
33268eaf JB |
119 | |
120 | return ret; | |
121 | } | |
fb4bc1e0 | 122 | |
996a710d | 123 | int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
744f52f9 | 124 | { |
996a710d | 125 | return __btrfs_set_acl(NULL, inode, acl, type); |
744f52f9 | 126 | } |
33268eaf | 127 | |
33268eaf JB |
128 | /* |
129 | * btrfs_init_acl is already generally called under fs_mutex, so the locking | |
130 | * stuff has been fixed to work with that. If the locking stuff changes, we | |
131 | * need to re-evaluate the acl locking stuff. | |
132 | */ | |
f34f57a3 YZ |
133 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
134 | struct inode *inode, struct inode *dir) | |
33268eaf | 135 | { |
996a710d | 136 | struct posix_acl *default_acl, *acl; |
33268eaf JB |
137 | int ret = 0; |
138 | ||
139 | /* this happens with subvols */ | |
140 | if (!dir) | |
141 | return 0; | |
142 | ||
996a710d CH |
143 | ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
144 | if (ret) | |
145 | return ret; | |
33268eaf | 146 | |
996a710d CH |
147 | if (default_acl) { |
148 | ret = __btrfs_set_acl(trans, inode, default_acl, | |
149 | ACL_TYPE_DEFAULT); | |
150 | posix_acl_release(default_acl); | |
33268eaf JB |
151 | } |
152 | ||
996a710d CH |
153 | if (acl) { |
154 | if (!ret) | |
155 | ret = __btrfs_set_acl(trans, inode, acl, | |
156 | ACL_TYPE_ACCESS); | |
157 | posix_acl_release(acl); | |
33268eaf | 158 | } |
33268eaf | 159 | |
996a710d CH |
160 | if (!default_acl && !acl) |
161 | cache_no_acl(inode); | |
33268eaf | 162 | return ret; |
5103e947 | 163 | } |