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: | |
95819c05 | 40 | name = POSIX_ACL_XATTR_ACCESS; |
33268eaf JB |
41 | break; |
42 | case ACL_TYPE_DEFAULT: | |
95819c05 | 43 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
44 | break; |
45 | default: | |
073aaa1b | 46 | BUG(); |
33268eaf JB |
47 | } |
48 | ||
95819c05 | 49 | size = __btrfs_getxattr(inode, name, "", 0); |
33268eaf JB |
50 | if (size > 0) { |
51 | value = kzalloc(size, GFP_NOFS); | |
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 | ||
66 | if (!IS_ERR(acl)) | |
67 | set_cached_acl(inode, type, acl); | |
33268eaf JB |
68 | |
69 | return acl; | |
70 | } | |
71 | ||
33268eaf JB |
72 | /* |
73 | * Needs to be called with fs_mutex held | |
74 | */ | |
996a710d | 75 | static int __btrfs_set_acl(struct btrfs_trans_handle *trans, |
f34f57a3 | 76 | struct inode *inode, struct posix_acl *acl, int type) |
33268eaf | 77 | { |
95819c05 CH |
78 | int ret, size = 0; |
79 | const char *name; | |
33268eaf | 80 | char *value = NULL; |
33268eaf JB |
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: | |
95819c05 | 91 | name = POSIX_ACL_XATTR_ACCESS; |
a9cc71a6 | 92 | if (acl) { |
d6952123 | 93 | ret = posix_acl_equiv_mode(acl, &inode->i_mode); |
a9cc71a6 CM |
94 | if (ret < 0) |
95 | return ret; | |
755ac67f LB |
96 | if (ret == 0) |
97 | acl = NULL; | |
a9cc71a6 CM |
98 | } |
99 | ret = 0; | |
33268eaf JB |
100 | break; |
101 | case ACL_TYPE_DEFAULT: | |
102 | if (!S_ISDIR(inode->i_mode)) | |
103 | return acl ? -EINVAL : 0; | |
95819c05 | 104 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
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 | ||
5f3a4a28 | 118 | ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); |
33268eaf JB |
119 | if (ret < 0) |
120 | goto out; | |
121 | } | |
122 | ||
f34f57a3 | 123 | ret = __btrfs_setxattr(trans, inode, name, value, size, 0); |
33268eaf | 124 | out: |
d397712b | 125 | kfree(value); |
33268eaf JB |
126 | |
127 | if (!ret) | |
073aaa1b | 128 | set_cached_acl(inode, type, acl); |
33268eaf JB |
129 | |
130 | return ret; | |
131 | } | |
fb4bc1e0 | 132 | |
996a710d | 133 | int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
744f52f9 | 134 | { |
996a710d | 135 | return __btrfs_set_acl(NULL, inode, acl, type); |
744f52f9 | 136 | } |
33268eaf | 137 | |
33268eaf JB |
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 | */ | |
f34f57a3 YZ |
143 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
144 | struct inode *inode, struct inode *dir) | |
33268eaf | 145 | { |
996a710d | 146 | struct posix_acl *default_acl, *acl; |
33268eaf JB |
147 | int ret = 0; |
148 | ||
149 | /* this happens with subvols */ | |
150 | if (!dir) | |
151 | return 0; | |
152 | ||
996a710d CH |
153 | ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
154 | if (ret) | |
155 | return ret; | |
33268eaf | 156 | |
996a710d CH |
157 | if (default_acl) { |
158 | ret = __btrfs_set_acl(trans, inode, default_acl, | |
159 | ACL_TYPE_DEFAULT); | |
160 | posix_acl_release(default_acl); | |
33268eaf JB |
161 | } |
162 | ||
996a710d CH |
163 | if (acl) { |
164 | if (!ret) | |
165 | ret = __btrfs_set_acl(trans, inode, acl, | |
166 | ACL_TYPE_ACCESS); | |
167 | posix_acl_release(acl); | |
33268eaf | 168 | } |
33268eaf | 169 | |
996a710d CH |
170 | if (!default_acl && !acl) |
171 | cache_no_acl(inode); | |
33268eaf | 172 | return ret; |
5103e947 | 173 | } |