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 | |
eab922ec JB |
30 | #ifdef CONFIG_FS_POSIX_ACL |
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 | ||
76 | static int btrfs_xattr_get_acl(struct inode *inode, int type, | |
77 | void *value, size_t size) | |
78 | { | |
79 | struct posix_acl *acl; | |
80 | int ret = 0; | |
81 | ||
82 | acl = btrfs_get_acl(inode, type); | |
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 | */ | |
97 | static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
98 | { | |
95819c05 CH |
99 | int ret, size = 0; |
100 | const char *name; | |
33268eaf JB |
101 | char *value = NULL; |
102 | mode_t mode; | |
103 | ||
104 | if (acl) { | |
105 | ret = posix_acl_valid(acl); | |
106 | if (ret < 0) | |
107 | return ret; | |
108 | ret = 0; | |
109 | } | |
110 | ||
111 | switch (type) { | |
112 | case ACL_TYPE_ACCESS: | |
113 | mode = inode->i_mode; | |
114 | ret = posix_acl_equiv_mode(acl, &mode); | |
115 | if (ret < 0) | |
116 | return ret; | |
117 | ret = 0; | |
118 | inode->i_mode = mode; | |
95819c05 | 119 | name = POSIX_ACL_XATTR_ACCESS; |
33268eaf JB |
120 | break; |
121 | case ACL_TYPE_DEFAULT: | |
122 | if (!S_ISDIR(inode->i_mode)) | |
123 | return acl ? -EINVAL : 0; | |
95819c05 | 124 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
125 | break; |
126 | default: | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | if (acl) { | |
131 | size = posix_acl_xattr_size(acl->a_count); | |
132 | value = kmalloc(size, GFP_NOFS); | |
133 | if (!value) { | |
134 | ret = -ENOMEM; | |
135 | goto out; | |
136 | } | |
137 | ||
138 | ret = posix_acl_to_xattr(acl, value, size); | |
139 | if (ret < 0) | |
140 | goto out; | |
141 | } | |
142 | ||
95819c05 | 143 | ret = __btrfs_setxattr(inode, name, value, size, 0); |
33268eaf JB |
144 | |
145 | out: | |
d397712b | 146 | kfree(value); |
33268eaf JB |
147 | |
148 | if (!ret) | |
073aaa1b | 149 | set_cached_acl(inode, type, acl); |
33268eaf JB |
150 | |
151 | return ret; | |
152 | } | |
fb4bc1e0 | 153 | |
744f52f9 Y |
154 | static int btrfs_xattr_set_acl(struct inode *inode, int type, |
155 | const void *value, size_t size) | |
156 | { | |
157 | int ret = 0; | |
33268eaf | 158 | struct posix_acl *acl = NULL; |
5103e947 | 159 | |
744f52f9 Y |
160 | if (value) { |
161 | acl = posix_acl_from_xattr(value, size); | |
162 | if (acl == NULL) { | |
163 | value = NULL; | |
164 | size = 0; | |
165 | } else if (IS_ERR(acl)) { | |
33268eaf | 166 | return PTR_ERR(acl); |
744f52f9 | 167 | } |
744f52f9 | 168 | } |
1caf9342 | 169 | |
33268eaf JB |
170 | ret = btrfs_set_acl(inode, acl, type); |
171 | ||
172 | posix_acl_release(acl); | |
173 | ||
174 | return ret; | |
744f52f9 | 175 | } |
33268eaf JB |
176 | |
177 | ||
5103e947 JB |
178 | static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name, |
179 | void *value, size_t size) | |
180 | { | |
33268eaf | 181 | return btrfs_xattr_get_acl(inode, ACL_TYPE_ACCESS, value, size); |
5103e947 | 182 | } |
33268eaf | 183 | |
5103e947 JB |
184 | static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name, |
185 | const void *value, size_t size, int flags) | |
186 | { | |
33268eaf | 187 | return btrfs_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size); |
5103e947 | 188 | } |
33268eaf | 189 | |
5103e947 JB |
190 | static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name, |
191 | void *value, size_t size) | |
192 | { | |
33268eaf | 193 | return btrfs_xattr_get_acl(inode, ACL_TYPE_DEFAULT, value, size); |
5103e947 | 194 | } |
33268eaf | 195 | |
5103e947 | 196 | static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name, |
d397712b | 197 | const void *value, size_t size, int flags) |
5103e947 | 198 | { |
33268eaf JB |
199 | return btrfs_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size); |
200 | } | |
201 | ||
202 | int btrfs_check_acl(struct inode *inode, int mask) | |
203 | { | |
204 | struct posix_acl *acl; | |
205 | int error = -EAGAIN; | |
206 | ||
207 | acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); | |
208 | ||
209 | if (IS_ERR(acl)) | |
210 | return PTR_ERR(acl); | |
211 | if (acl) { | |
212 | error = posix_acl_permission(inode, acl, mask); | |
213 | posix_acl_release(acl); | |
214 | } | |
215 | ||
216 | return error; | |
217 | } | |
218 | ||
219 | /* | |
220 | * btrfs_init_acl is already generally called under fs_mutex, so the locking | |
221 | * stuff has been fixed to work with that. If the locking stuff changes, we | |
222 | * need to re-evaluate the acl locking stuff. | |
223 | */ | |
224 | int btrfs_init_acl(struct inode *inode, struct inode *dir) | |
225 | { | |
226 | struct posix_acl *acl = NULL; | |
227 | int ret = 0; | |
228 | ||
229 | /* this happens with subvols */ | |
230 | if (!dir) | |
231 | return 0; | |
232 | ||
233 | if (!S_ISLNK(inode->i_mode)) { | |
234 | if (IS_POSIXACL(dir)) { | |
235 | acl = btrfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
236 | if (IS_ERR(acl)) | |
237 | return PTR_ERR(acl); | |
238 | } | |
239 | ||
240 | if (!acl) | |
ce3b0f8d | 241 | inode->i_mode &= ~current_umask(); |
33268eaf JB |
242 | } |
243 | ||
244 | if (IS_POSIXACL(dir) && acl) { | |
245 | struct posix_acl *clone; | |
246 | mode_t mode; | |
247 | ||
248 | if (S_ISDIR(inode->i_mode)) { | |
249 | ret = btrfs_set_acl(inode, acl, ACL_TYPE_DEFAULT); | |
250 | if (ret) | |
251 | goto failed; | |
252 | } | |
253 | clone = posix_acl_clone(acl, GFP_NOFS); | |
254 | ret = -ENOMEM; | |
255 | if (!clone) | |
256 | goto failed; | |
257 | ||
258 | mode = inode->i_mode; | |
259 | ret = posix_acl_create_masq(clone, &mode); | |
260 | if (ret >= 0) { | |
261 | inode->i_mode = mode; | |
262 | if (ret > 0) { | |
263 | /* we need an acl */ | |
264 | ret = btrfs_set_acl(inode, clone, | |
265 | ACL_TYPE_ACCESS); | |
266 | } | |
267 | } | |
268 | } | |
269 | failed: | |
270 | posix_acl_release(acl); | |
271 | ||
272 | return ret; | |
273 | } | |
274 | ||
275 | int btrfs_acl_chmod(struct inode *inode) | |
276 | { | |
277 | struct posix_acl *acl, *clone; | |
278 | int ret = 0; | |
279 | ||
280 | if (S_ISLNK(inode->i_mode)) | |
281 | return -EOPNOTSUPP; | |
282 | ||
283 | if (!IS_POSIXACL(inode)) | |
284 | return 0; | |
285 | ||
286 | acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); | |
287 | if (IS_ERR(acl) || !acl) | |
288 | return PTR_ERR(acl); | |
289 | ||
290 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
291 | posix_acl_release(acl); | |
292 | if (!clone) | |
293 | return -ENOMEM; | |
294 | ||
295 | ret = posix_acl_chmod_masq(clone, inode->i_mode); | |
296 | if (!ret) | |
297 | ret = btrfs_set_acl(inode, clone, ACL_TYPE_ACCESS); | |
298 | ||
299 | posix_acl_release(clone); | |
300 | ||
301 | return ret; | |
5103e947 | 302 | } |
33268eaf | 303 | |
5103e947 JB |
304 | struct xattr_handler btrfs_xattr_acl_default_handler = { |
305 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
5103e947 JB |
306 | .get = btrfs_xattr_acl_default_get, |
307 | .set = btrfs_xattr_acl_default_set, | |
308 | }; | |
309 | ||
310 | struct xattr_handler btrfs_xattr_acl_access_handler = { | |
311 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
5103e947 JB |
312 | .get = btrfs_xattr_acl_access_get, |
313 | .set = btrfs_xattr_acl_access_set, | |
314 | }; | |
eab922ec JB |
315 | |
316 | #else /* CONFIG_FS_POSIX_ACL */ | |
317 | ||
318 | int btrfs_acl_chmod(struct inode *inode) | |
319 | { | |
320 | return 0; | |
321 | } | |
322 | ||
323 | int btrfs_init_acl(struct inode *inode, struct inode *dir) | |
324 | { | |
325 | return 0; | |
326 | } | |
327 | ||
eab922ec | 328 | #endif /* CONFIG_FS_POSIX_ACL */ |