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 | |
0eda294d | 31 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
eab922ec | 32 | |
33268eaf JB |
33 | static struct posix_acl *btrfs_get_acl(struct inode *inode, int type) |
34 | { | |
95819c05 CH |
35 | int size; |
36 | const char *name; | |
33268eaf | 37 | char *value = NULL; |
073aaa1b AV |
38 | struct posix_acl *acl; |
39 | ||
40 | acl = get_cached_acl(inode, type); | |
41 | if (acl != ACL_NOT_CACHED) | |
42 | return acl; | |
33268eaf JB |
43 | |
44 | switch (type) { | |
45 | case ACL_TYPE_ACCESS: | |
95819c05 | 46 | name = POSIX_ACL_XATTR_ACCESS; |
33268eaf JB |
47 | break; |
48 | case ACL_TYPE_DEFAULT: | |
95819c05 | 49 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
50 | break; |
51 | default: | |
073aaa1b | 52 | BUG(); |
33268eaf JB |
53 | } |
54 | ||
95819c05 | 55 | size = __btrfs_getxattr(inode, name, "", 0); |
33268eaf JB |
56 | if (size > 0) { |
57 | value = kzalloc(size, GFP_NOFS); | |
58 | if (!value) | |
59 | return ERR_PTR(-ENOMEM); | |
95819c05 | 60 | size = __btrfs_getxattr(inode, name, value, size); |
33268eaf JB |
61 | if (size > 0) { |
62 | acl = posix_acl_from_xattr(value, size); | |
073aaa1b | 63 | set_cached_acl(inode, type, acl); |
33268eaf JB |
64 | } |
65 | kfree(value); | |
7b1a14bb CM |
66 | } else if (size == -ENOENT || size == -ENODATA || size == 0) { |
67 | /* FIXME, who returns -ENOENT? I think nobody */ | |
33268eaf | 68 | acl = NULL; |
073aaa1b | 69 | set_cached_acl(inode, type, acl); |
7b1a14bb CM |
70 | } else { |
71 | acl = ERR_PTR(-EIO); | |
33268eaf JB |
72 | } |
73 | ||
74 | return acl; | |
75 | } | |
76 | ||
431547b3 CH |
77 | static int btrfs_xattr_acl_get(struct dentry *dentry, const char *name, |
78 | void *value, size_t size, int type) | |
33268eaf JB |
79 | { |
80 | struct posix_acl *acl; | |
81 | int ret = 0; | |
82 | ||
431547b3 | 83 | acl = btrfs_get_acl(dentry->d_inode, type); |
33268eaf JB |
84 | |
85 | if (IS_ERR(acl)) | |
86 | return PTR_ERR(acl); | |
87 | if (acl == NULL) | |
88 | return -ENODATA; | |
89 | ret = posix_acl_to_xattr(acl, value, size); | |
90 | posix_acl_release(acl); | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
95 | /* | |
96 | * Needs to be called with fs_mutex held | |
97 | */ | |
f34f57a3 YZ |
98 | static int btrfs_set_acl(struct btrfs_trans_handle *trans, |
99 | struct inode *inode, struct posix_acl *acl, int type) | |
33268eaf | 100 | { |
95819c05 CH |
101 | int ret, size = 0; |
102 | const char *name; | |
33268eaf JB |
103 | char *value = NULL; |
104 | mode_t mode; | |
105 | ||
106 | if (acl) { | |
107 | ret = posix_acl_valid(acl); | |
108 | if (ret < 0) | |
109 | return ret; | |
110 | ret = 0; | |
111 | } | |
112 | ||
113 | switch (type) { | |
114 | case ACL_TYPE_ACCESS: | |
115 | mode = inode->i_mode; | |
95819c05 | 116 | name = POSIX_ACL_XATTR_ACCESS; |
a9cc71a6 CM |
117 | if (acl) { |
118 | ret = posix_acl_equiv_mode(acl, &mode); | |
119 | if (ret < 0) | |
120 | return ret; | |
121 | inode->i_mode = mode; | |
122 | } | |
123 | ret = 0; | |
33268eaf JB |
124 | break; |
125 | case ACL_TYPE_DEFAULT: | |
126 | if (!S_ISDIR(inode->i_mode)) | |
127 | return acl ? -EINVAL : 0; | |
95819c05 | 128 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
129 | break; |
130 | default: | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | if (acl) { | |
135 | size = posix_acl_xattr_size(acl->a_count); | |
136 | value = kmalloc(size, GFP_NOFS); | |
137 | if (!value) { | |
138 | ret = -ENOMEM; | |
139 | goto out; | |
140 | } | |
141 | ||
142 | ret = posix_acl_to_xattr(acl, value, size); | |
143 | if (ret < 0) | |
144 | goto out; | |
145 | } | |
146 | ||
f34f57a3 | 147 | ret = __btrfs_setxattr(trans, inode, name, value, size, 0); |
33268eaf | 148 | out: |
d397712b | 149 | kfree(value); |
33268eaf JB |
150 | |
151 | if (!ret) | |
073aaa1b | 152 | set_cached_acl(inode, type, acl); |
33268eaf JB |
153 | |
154 | return ret; | |
155 | } | |
fb4bc1e0 | 156 | |
431547b3 CH |
157 | static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name, |
158 | const void *value, size_t size, int flags, int type) | |
744f52f9 | 159 | { |
f34f57a3 | 160 | int ret; |
33268eaf | 161 | struct posix_acl *acl = NULL; |
5103e947 | 162 | |
744f52f9 Y |
163 | if (value) { |
164 | acl = posix_acl_from_xattr(value, size); | |
165 | if (acl == NULL) { | |
166 | value = NULL; | |
167 | size = 0; | |
168 | } else if (IS_ERR(acl)) { | |
33268eaf | 169 | return PTR_ERR(acl); |
744f52f9 | 170 | } |
744f52f9 | 171 | } |
1caf9342 | 172 | |
ebfee3d7 | 173 | ret = btrfs_set_acl(NULL, dentry->d_inode, acl, type); |
33268eaf JB |
174 | |
175 | posix_acl_release(acl); | |
176 | ||
177 | return ret; | |
744f52f9 | 178 | } |
33268eaf | 179 | |
33268eaf JB |
180 | int btrfs_check_acl(struct inode *inode, int mask) |
181 | { | |
182 | struct posix_acl *acl; | |
183 | int error = -EAGAIN; | |
184 | ||
185 | acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); | |
186 | ||
187 | if (IS_ERR(acl)) | |
188 | return PTR_ERR(acl); | |
189 | if (acl) { | |
190 | error = posix_acl_permission(inode, acl, mask); | |
191 | posix_acl_release(acl); | |
192 | } | |
193 | ||
194 | return error; | |
195 | } | |
196 | ||
197 | /* | |
198 | * btrfs_init_acl is already generally called under fs_mutex, so the locking | |
199 | * stuff has been fixed to work with that. If the locking stuff changes, we | |
200 | * need to re-evaluate the acl locking stuff. | |
201 | */ | |
f34f57a3 YZ |
202 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
203 | struct inode *inode, struct inode *dir) | |
33268eaf JB |
204 | { |
205 | struct posix_acl *acl = NULL; | |
206 | int ret = 0; | |
207 | ||
208 | /* this happens with subvols */ | |
209 | if (!dir) | |
210 | return 0; | |
211 | ||
212 | if (!S_ISLNK(inode->i_mode)) { | |
213 | if (IS_POSIXACL(dir)) { | |
214 | acl = btrfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
215 | if (IS_ERR(acl)) | |
216 | return PTR_ERR(acl); | |
217 | } | |
218 | ||
219 | if (!acl) | |
ce3b0f8d | 220 | inode->i_mode &= ~current_umask(); |
33268eaf JB |
221 | } |
222 | ||
223 | if (IS_POSIXACL(dir) && acl) { | |
224 | struct posix_acl *clone; | |
225 | mode_t mode; | |
226 | ||
227 | if (S_ISDIR(inode->i_mode)) { | |
f34f57a3 YZ |
228 | ret = btrfs_set_acl(trans, inode, acl, |
229 | ACL_TYPE_DEFAULT); | |
33268eaf JB |
230 | if (ret) |
231 | goto failed; | |
232 | } | |
233 | clone = posix_acl_clone(acl, GFP_NOFS); | |
234 | ret = -ENOMEM; | |
235 | if (!clone) | |
236 | goto failed; | |
237 | ||
238 | mode = inode->i_mode; | |
239 | ret = posix_acl_create_masq(clone, &mode); | |
240 | if (ret >= 0) { | |
241 | inode->i_mode = mode; | |
242 | if (ret > 0) { | |
243 | /* we need an acl */ | |
f34f57a3 | 244 | ret = btrfs_set_acl(trans, inode, clone, |
33268eaf JB |
245 | ACL_TYPE_ACCESS); |
246 | } | |
247 | } | |
f858153c | 248 | posix_acl_release(clone); |
33268eaf JB |
249 | } |
250 | failed: | |
251 | posix_acl_release(acl); | |
252 | ||
253 | return ret; | |
254 | } | |
255 | ||
256 | int btrfs_acl_chmod(struct inode *inode) | |
257 | { | |
258 | struct posix_acl *acl, *clone; | |
259 | int ret = 0; | |
260 | ||
261 | if (S_ISLNK(inode->i_mode)) | |
262 | return -EOPNOTSUPP; | |
263 | ||
264 | if (!IS_POSIXACL(inode)) | |
265 | return 0; | |
266 | ||
267 | acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); | |
268 | if (IS_ERR(acl) || !acl) | |
269 | return PTR_ERR(acl); | |
270 | ||
271 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
272 | posix_acl_release(acl); | |
273 | if (!clone) | |
274 | return -ENOMEM; | |
275 | ||
276 | ret = posix_acl_chmod_masq(clone, inode->i_mode); | |
277 | if (!ret) | |
f34f57a3 | 278 | ret = btrfs_set_acl(NULL, inode, clone, ACL_TYPE_ACCESS); |
33268eaf JB |
279 | |
280 | posix_acl_release(clone); | |
281 | ||
282 | return ret; | |
5103e947 | 283 | } |
33268eaf | 284 | |
5103e947 JB |
285 | struct xattr_handler btrfs_xattr_acl_default_handler = { |
286 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
431547b3 CH |
287 | .flags = ACL_TYPE_DEFAULT, |
288 | .get = btrfs_xattr_acl_get, | |
289 | .set = btrfs_xattr_acl_set, | |
5103e947 JB |
290 | }; |
291 | ||
292 | struct xattr_handler btrfs_xattr_acl_access_handler = { | |
293 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
431547b3 CH |
294 | .flags = ACL_TYPE_ACCESS, |
295 | .get = btrfs_xattr_acl_get, | |
296 | .set = btrfs_xattr_acl_set, | |
5103e947 | 297 | }; |
eab922ec | 298 | |
0eda294d | 299 | #else /* CONFIG_BTRFS_FS_POSIX_ACL */ |
eab922ec JB |
300 | |
301 | int btrfs_acl_chmod(struct inode *inode) | |
302 | { | |
303 | return 0; | |
304 | } | |
305 | ||
f34f57a3 YZ |
306 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
307 | struct inode *inode, struct inode *dir) | |
eab922ec JB |
308 | { |
309 | return 0; | |
310 | } | |
311 | ||
0eda294d | 312 | #endif /* CONFIG_BTRFS_FS_POSIX_ACL */ |