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> |
33268eaf | 25 | |
5103e947 | 26 | #include "ctree.h" |
33268eaf | 27 | #include "btrfs_inode.h" |
5103e947 | 28 | #include "xattr.h" |
33268eaf | 29 | |
0eda294d | 30 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
eab922ec | 31 | |
33268eaf JB |
32 | static struct posix_acl *btrfs_get_acl(struct inode *inode, int type) |
33 | { | |
95819c05 CH |
34 | int size; |
35 | const char *name; | |
33268eaf | 36 | char *value = NULL; |
073aaa1b AV |
37 | struct posix_acl *acl; |
38 | ||
39 | acl = get_cached_acl(inode, type); | |
40 | if (acl != ACL_NOT_CACHED) | |
41 | return acl; | |
33268eaf JB |
42 | |
43 | switch (type) { | |
44 | case ACL_TYPE_ACCESS: | |
95819c05 | 45 | name = POSIX_ACL_XATTR_ACCESS; |
33268eaf JB |
46 | break; |
47 | case ACL_TYPE_DEFAULT: | |
95819c05 | 48 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
49 | break; |
50 | default: | |
073aaa1b | 51 | BUG(); |
33268eaf JB |
52 | } |
53 | ||
95819c05 | 54 | size = __btrfs_getxattr(inode, name, "", 0); |
33268eaf JB |
55 | if (size > 0) { |
56 | value = kzalloc(size, GFP_NOFS); | |
57 | if (!value) | |
58 | return ERR_PTR(-ENOMEM); | |
95819c05 | 59 | size = __btrfs_getxattr(inode, name, value, size); |
33268eaf JB |
60 | if (size > 0) { |
61 | acl = posix_acl_from_xattr(value, size); | |
073aaa1b | 62 | set_cached_acl(inode, type, acl); |
33268eaf JB |
63 | } |
64 | kfree(value); | |
7b1a14bb CM |
65 | } else if (size == -ENOENT || size == -ENODATA || size == 0) { |
66 | /* FIXME, who returns -ENOENT? I think nobody */ | |
33268eaf | 67 | acl = NULL; |
073aaa1b | 68 | set_cached_acl(inode, type, acl); |
7b1a14bb CM |
69 | } else { |
70 | acl = ERR_PTR(-EIO); | |
33268eaf JB |
71 | } |
72 | ||
73 | return acl; | |
74 | } | |
75 | ||
431547b3 CH |
76 | static int btrfs_xattr_acl_get(struct dentry *dentry, const char *name, |
77 | void *value, size_t size, int type) | |
33268eaf JB |
78 | { |
79 | struct posix_acl *acl; | |
80 | int ret = 0; | |
81 | ||
431547b3 | 82 | acl = btrfs_get_acl(dentry->d_inode, type); |
33268eaf JB |
83 | |
84 | if (IS_ERR(acl)) | |
85 | return PTR_ERR(acl); | |
86 | if (acl == NULL) | |
87 | return -ENODATA; | |
88 | ret = posix_acl_to_xattr(acl, value, size); | |
89 | posix_acl_release(acl); | |
90 | ||
91 | return ret; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Needs to be called with fs_mutex held | |
96 | */ | |
f34f57a3 YZ |
97 | static int btrfs_set_acl(struct btrfs_trans_handle *trans, |
98 | struct inode *inode, struct posix_acl *acl, int type) | |
33268eaf | 99 | { |
95819c05 CH |
100 | int ret, size = 0; |
101 | const char *name; | |
33268eaf JB |
102 | char *value = NULL; |
103 | mode_t mode; | |
104 | ||
105 | if (acl) { | |
106 | ret = posix_acl_valid(acl); | |
107 | if (ret < 0) | |
108 | return ret; | |
109 | ret = 0; | |
110 | } | |
111 | ||
112 | switch (type) { | |
113 | case ACL_TYPE_ACCESS: | |
114 | mode = inode->i_mode; | |
95819c05 | 115 | name = POSIX_ACL_XATTR_ACCESS; |
a9cc71a6 CM |
116 | if (acl) { |
117 | ret = posix_acl_equiv_mode(acl, &mode); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | inode->i_mode = mode; | |
121 | } | |
122 | ret = 0; | |
33268eaf JB |
123 | break; |
124 | case ACL_TYPE_DEFAULT: | |
125 | if (!S_ISDIR(inode->i_mode)) | |
126 | return acl ? -EINVAL : 0; | |
95819c05 | 127 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
128 | break; |
129 | default: | |
130 | return -EINVAL; | |
131 | } | |
132 | ||
133 | if (acl) { | |
134 | size = posix_acl_xattr_size(acl->a_count); | |
135 | value = kmalloc(size, GFP_NOFS); | |
136 | if (!value) { | |
137 | ret = -ENOMEM; | |
138 | goto out; | |
139 | } | |
140 | ||
141 | ret = posix_acl_to_xattr(acl, value, size); | |
142 | if (ret < 0) | |
143 | goto out; | |
144 | } | |
145 | ||
f34f57a3 | 146 | ret = __btrfs_setxattr(trans, inode, name, value, size, 0); |
33268eaf | 147 | out: |
d397712b | 148 | kfree(value); |
33268eaf JB |
149 | |
150 | if (!ret) | |
073aaa1b | 151 | set_cached_acl(inode, type, acl); |
33268eaf JB |
152 | |
153 | return ret; | |
154 | } | |
fb4bc1e0 | 155 | |
431547b3 CH |
156 | static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name, |
157 | const void *value, size_t size, int flags, int type) | |
744f52f9 | 158 | { |
f34f57a3 | 159 | int ret; |
33268eaf | 160 | struct posix_acl *acl = NULL; |
5103e947 | 161 | |
744f52f9 Y |
162 | if (value) { |
163 | acl = posix_acl_from_xattr(value, size); | |
164 | if (acl == NULL) { | |
165 | value = NULL; | |
166 | size = 0; | |
167 | } else if (IS_ERR(acl)) { | |
33268eaf | 168 | return PTR_ERR(acl); |
744f52f9 | 169 | } |
744f52f9 | 170 | } |
1caf9342 | 171 | |
ebfee3d7 | 172 | ret = btrfs_set_acl(NULL, dentry->d_inode, acl, type); |
33268eaf JB |
173 | |
174 | posix_acl_release(acl); | |
175 | ||
176 | return ret; | |
744f52f9 | 177 | } |
33268eaf | 178 | |
33268eaf JB |
179 | int btrfs_check_acl(struct inode *inode, int mask) |
180 | { | |
181 | struct posix_acl *acl; | |
182 | int error = -EAGAIN; | |
183 | ||
184 | acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); | |
185 | ||
186 | if (IS_ERR(acl)) | |
187 | return PTR_ERR(acl); | |
188 | if (acl) { | |
189 | error = posix_acl_permission(inode, acl, mask); | |
190 | posix_acl_release(acl); | |
191 | } | |
192 | ||
193 | return error; | |
194 | } | |
195 | ||
196 | /* | |
197 | * btrfs_init_acl is already generally called under fs_mutex, so the locking | |
198 | * stuff has been fixed to work with that. If the locking stuff changes, we | |
199 | * need to re-evaluate the acl locking stuff. | |
200 | */ | |
f34f57a3 YZ |
201 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
202 | struct inode *inode, struct inode *dir) | |
33268eaf JB |
203 | { |
204 | struct posix_acl *acl = NULL; | |
205 | int ret = 0; | |
206 | ||
207 | /* this happens with subvols */ | |
208 | if (!dir) | |
209 | return 0; | |
210 | ||
211 | if (!S_ISLNK(inode->i_mode)) { | |
212 | if (IS_POSIXACL(dir)) { | |
213 | acl = btrfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
214 | if (IS_ERR(acl)) | |
215 | return PTR_ERR(acl); | |
216 | } | |
217 | ||
218 | if (!acl) | |
ce3b0f8d | 219 | inode->i_mode &= ~current_umask(); |
33268eaf JB |
220 | } |
221 | ||
222 | if (IS_POSIXACL(dir) && acl) { | |
223 | struct posix_acl *clone; | |
224 | mode_t mode; | |
225 | ||
226 | if (S_ISDIR(inode->i_mode)) { | |
f34f57a3 YZ |
227 | ret = btrfs_set_acl(trans, inode, acl, |
228 | ACL_TYPE_DEFAULT); | |
33268eaf JB |
229 | if (ret) |
230 | goto failed; | |
231 | } | |
232 | clone = posix_acl_clone(acl, GFP_NOFS); | |
233 | ret = -ENOMEM; | |
234 | if (!clone) | |
235 | goto failed; | |
236 | ||
237 | mode = inode->i_mode; | |
238 | ret = posix_acl_create_masq(clone, &mode); | |
239 | if (ret >= 0) { | |
240 | inode->i_mode = mode; | |
241 | if (ret > 0) { | |
242 | /* we need an acl */ | |
f34f57a3 | 243 | ret = btrfs_set_acl(trans, inode, clone, |
33268eaf JB |
244 | ACL_TYPE_ACCESS); |
245 | } | |
246 | } | |
f858153c | 247 | posix_acl_release(clone); |
33268eaf JB |
248 | } |
249 | failed: | |
250 | posix_acl_release(acl); | |
251 | ||
252 | return ret; | |
253 | } | |
254 | ||
255 | int btrfs_acl_chmod(struct inode *inode) | |
256 | { | |
257 | struct posix_acl *acl, *clone; | |
258 | int ret = 0; | |
259 | ||
260 | if (S_ISLNK(inode->i_mode)) | |
261 | return -EOPNOTSUPP; | |
262 | ||
263 | if (!IS_POSIXACL(inode)) | |
264 | return 0; | |
265 | ||
266 | acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); | |
267 | if (IS_ERR(acl) || !acl) | |
268 | return PTR_ERR(acl); | |
269 | ||
270 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
271 | posix_acl_release(acl); | |
272 | if (!clone) | |
273 | return -ENOMEM; | |
274 | ||
275 | ret = posix_acl_chmod_masq(clone, inode->i_mode); | |
276 | if (!ret) | |
f34f57a3 | 277 | ret = btrfs_set_acl(NULL, inode, clone, ACL_TYPE_ACCESS); |
33268eaf JB |
278 | |
279 | posix_acl_release(clone); | |
280 | ||
281 | return ret; | |
5103e947 | 282 | } |
33268eaf | 283 | |
5103e947 JB |
284 | struct xattr_handler btrfs_xattr_acl_default_handler = { |
285 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
431547b3 CH |
286 | .flags = ACL_TYPE_DEFAULT, |
287 | .get = btrfs_xattr_acl_get, | |
288 | .set = btrfs_xattr_acl_set, | |
5103e947 JB |
289 | }; |
290 | ||
291 | struct xattr_handler btrfs_xattr_acl_access_handler = { | |
292 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
431547b3 CH |
293 | .flags = ACL_TYPE_ACCESS, |
294 | .get = btrfs_xattr_acl_get, | |
295 | .set = btrfs_xattr_acl_set, | |
5103e947 | 296 | }; |
eab922ec | 297 | |
0eda294d | 298 | #else /* CONFIG_BTRFS_FS_POSIX_ACL */ |
eab922ec JB |
299 | |
300 | int btrfs_acl_chmod(struct inode *inode) | |
301 | { | |
302 | return 0; | |
303 | } | |
304 | ||
f34f57a3 YZ |
305 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
306 | struct inode *inode, struct inode *dir) | |
eab922ec JB |
307 | { |
308 | return 0; | |
309 | } | |
310 | ||
0eda294d | 311 | #endif /* CONFIG_BTRFS_FS_POSIX_ACL */ |