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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 | |
4e34e719 | 33 | struct posix_acl *btrfs_get_acl(struct inode *inode, int type) |
33268eaf | 34 | { |
95819c05 CH |
35 | int size; |
36 | const char *name; | |
33268eaf | 37 | char *value = NULL; |
073aaa1b AV |
38 | struct posix_acl *acl; |
39 | ||
d0f69686 MX |
40 | if (!IS_POSIXACL(inode)) |
41 | return NULL; | |
42 | ||
073aaa1b AV |
43 | acl = get_cached_acl(inode, type); |
44 | if (acl != ACL_NOT_CACHED) | |
45 | return acl; | |
33268eaf JB |
46 | |
47 | switch (type) { | |
48 | case ACL_TYPE_ACCESS: | |
95819c05 | 49 | name = POSIX_ACL_XATTR_ACCESS; |
33268eaf JB |
50 | break; |
51 | case ACL_TYPE_DEFAULT: | |
95819c05 | 52 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
53 | break; |
54 | default: | |
073aaa1b | 55 | BUG(); |
33268eaf JB |
56 | } |
57 | ||
95819c05 | 58 | size = __btrfs_getxattr(inode, name, "", 0); |
33268eaf JB |
59 | if (size > 0) { |
60 | value = kzalloc(size, GFP_NOFS); | |
61 | if (!value) | |
62 | return ERR_PTR(-ENOMEM); | |
95819c05 | 63 | size = __btrfs_getxattr(inode, name, value, size); |
33268eaf JB |
64 | if (size > 0) { |
65 | acl = posix_acl_from_xattr(value, size); | |
42838bb2 JJ |
66 | if (IS_ERR(acl)) { |
67 | kfree(value); | |
834e7475 | 68 | return acl; |
42838bb2 | 69 | } |
073aaa1b | 70 | set_cached_acl(inode, type, acl); |
33268eaf JB |
71 | } |
72 | kfree(value); | |
7b1a14bb CM |
73 | } else if (size == -ENOENT || size == -ENODATA || size == 0) { |
74 | /* FIXME, who returns -ENOENT? I think nobody */ | |
33268eaf | 75 | acl = NULL; |
073aaa1b | 76 | set_cached_acl(inode, type, acl); |
7b1a14bb CM |
77 | } else { |
78 | acl = ERR_PTR(-EIO); | |
33268eaf JB |
79 | } |
80 | ||
81 | return acl; | |
82 | } | |
83 | ||
431547b3 CH |
84 | static int btrfs_xattr_acl_get(struct dentry *dentry, const char *name, |
85 | void *value, size_t size, int type) | |
33268eaf JB |
86 | { |
87 | struct posix_acl *acl; | |
88 | int ret = 0; | |
89 | ||
d0f69686 MX |
90 | if (!IS_POSIXACL(dentry->d_inode)) |
91 | return -EOPNOTSUPP; | |
92 | ||
431547b3 | 93 | acl = btrfs_get_acl(dentry->d_inode, type); |
33268eaf JB |
94 | |
95 | if (IS_ERR(acl)) | |
96 | return PTR_ERR(acl); | |
97 | if (acl == NULL) | |
98 | return -ENODATA; | |
99 | ret = posix_acl_to_xattr(acl, value, size); | |
100 | posix_acl_release(acl); | |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Needs to be called with fs_mutex held | |
107 | */ | |
f34f57a3 YZ |
108 | static int btrfs_set_acl(struct btrfs_trans_handle *trans, |
109 | struct inode *inode, struct posix_acl *acl, int type) | |
33268eaf | 110 | { |
95819c05 CH |
111 | int ret, size = 0; |
112 | const char *name; | |
33268eaf JB |
113 | char *value = NULL; |
114 | mode_t mode; | |
115 | ||
116 | if (acl) { | |
117 | ret = posix_acl_valid(acl); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | ret = 0; | |
121 | } | |
122 | ||
123 | switch (type) { | |
124 | case ACL_TYPE_ACCESS: | |
125 | mode = inode->i_mode; | |
95819c05 | 126 | name = POSIX_ACL_XATTR_ACCESS; |
a9cc71a6 CM |
127 | if (acl) { |
128 | ret = posix_acl_equiv_mode(acl, &mode); | |
129 | if (ret < 0) | |
130 | return ret; | |
131 | inode->i_mode = mode; | |
132 | } | |
133 | ret = 0; | |
33268eaf JB |
134 | break; |
135 | case ACL_TYPE_DEFAULT: | |
136 | if (!S_ISDIR(inode->i_mode)) | |
137 | return acl ? -EINVAL : 0; | |
95819c05 | 138 | name = POSIX_ACL_XATTR_DEFAULT; |
33268eaf JB |
139 | break; |
140 | default: | |
141 | return -EINVAL; | |
142 | } | |
143 | ||
144 | if (acl) { | |
145 | size = posix_acl_xattr_size(acl->a_count); | |
146 | value = kmalloc(size, GFP_NOFS); | |
147 | if (!value) { | |
148 | ret = -ENOMEM; | |
149 | goto out; | |
150 | } | |
151 | ||
152 | ret = posix_acl_to_xattr(acl, value, size); | |
153 | if (ret < 0) | |
154 | goto out; | |
155 | } | |
156 | ||
f34f57a3 | 157 | ret = __btrfs_setxattr(trans, inode, name, value, size, 0); |
33268eaf | 158 | out: |
d397712b | 159 | kfree(value); |
33268eaf JB |
160 | |
161 | if (!ret) | |
073aaa1b | 162 | set_cached_acl(inode, type, acl); |
33268eaf JB |
163 | |
164 | return ret; | |
165 | } | |
fb4bc1e0 | 166 | |
431547b3 CH |
167 | static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name, |
168 | const void *value, size_t size, int flags, int type) | |
744f52f9 | 169 | { |
f34f57a3 | 170 | int ret; |
33268eaf | 171 | struct posix_acl *acl = NULL; |
5103e947 | 172 | |
2e149670 | 173 | if (!inode_owner_or_capable(dentry->d_inode)) |
2f26afba SW |
174 | return -EPERM; |
175 | ||
731e3d1b SW |
176 | if (!IS_POSIXACL(dentry->d_inode)) |
177 | return -EOPNOTSUPP; | |
178 | ||
744f52f9 Y |
179 | if (value) { |
180 | acl = posix_acl_from_xattr(value, size); | |
f5de9391 DB |
181 | if (IS_ERR(acl)) |
182 | return PTR_ERR(acl); | |
183 | ||
329c5056 MX |
184 | if (acl) { |
185 | ret = posix_acl_valid(acl); | |
186 | if (ret) | |
187 | goto out; | |
744f52f9 | 188 | } |
744f52f9 | 189 | } |
1caf9342 | 190 | |
ebfee3d7 | 191 | ret = btrfs_set_acl(NULL, dentry->d_inode, acl, type); |
329c5056 | 192 | out: |
33268eaf JB |
193 | posix_acl_release(acl); |
194 | ||
195 | return ret; | |
744f52f9 | 196 | } |
33268eaf | 197 | |
33268eaf JB |
198 | /* |
199 | * btrfs_init_acl is already generally called under fs_mutex, so the locking | |
200 | * stuff has been fixed to work with that. If the locking stuff changes, we | |
201 | * need to re-evaluate the acl locking stuff. | |
202 | */ | |
f34f57a3 YZ |
203 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
204 | struct inode *inode, struct inode *dir) | |
33268eaf JB |
205 | { |
206 | struct posix_acl *acl = NULL; | |
207 | int ret = 0; | |
208 | ||
209 | /* this happens with subvols */ | |
210 | if (!dir) | |
211 | return 0; | |
212 | ||
213 | if (!S_ISLNK(inode->i_mode)) { | |
214 | if (IS_POSIXACL(dir)) { | |
215 | acl = btrfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
216 | if (IS_ERR(acl)) | |
217 | return PTR_ERR(acl); | |
218 | } | |
219 | ||
220 | if (!acl) | |
ce3b0f8d | 221 | inode->i_mode &= ~current_umask(); |
33268eaf JB |
222 | } |
223 | ||
224 | if (IS_POSIXACL(dir) && acl) { | |
826cae2f | 225 | mode_t mode = inode->i_mode; |
33268eaf JB |
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 | } | |
826cae2f AV |
233 | ret = posix_acl_create(&acl, GFP_NOFS, &mode); |
234 | if (ret < 0) | |
235 | return ret; | |
33268eaf | 236 | |
826cae2f AV |
237 | inode->i_mode = mode; |
238 | if (ret > 0) { | |
239 | /* we need an acl */ | |
240 | ret = btrfs_set_acl(trans, inode, acl, ACL_TYPE_ACCESS); | |
33268eaf JB |
241 | } |
242 | } | |
243 | failed: | |
244 | posix_acl_release(acl); | |
245 | ||
246 | return ret; | |
247 | } | |
248 | ||
249 | int btrfs_acl_chmod(struct inode *inode) | |
250 | { | |
bc26ab5f | 251 | struct posix_acl *acl; |
33268eaf JB |
252 | int ret = 0; |
253 | ||
254 | if (S_ISLNK(inode->i_mode)) | |
255 | return -EOPNOTSUPP; | |
256 | ||
257 | if (!IS_POSIXACL(inode)) | |
258 | return 0; | |
259 | ||
260 | acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); | |
c704005d | 261 | if (IS_ERR_OR_NULL(acl)) |
33268eaf JB |
262 | return PTR_ERR(acl); |
263 | ||
bc26ab5f AV |
264 | ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
265 | if (ret) | |
266 | return ret; | |
267 | ret = btrfs_set_acl(NULL, inode, acl, ACL_TYPE_ACCESS); | |
33268eaf | 268 | posix_acl_release(acl); |
33268eaf | 269 | return ret; |
5103e947 | 270 | } |
33268eaf | 271 | |
f01cbd3f | 272 | const struct xattr_handler btrfs_xattr_acl_default_handler = { |
5103e947 | 273 | .prefix = POSIX_ACL_XATTR_DEFAULT, |
431547b3 CH |
274 | .flags = ACL_TYPE_DEFAULT, |
275 | .get = btrfs_xattr_acl_get, | |
276 | .set = btrfs_xattr_acl_set, | |
5103e947 JB |
277 | }; |
278 | ||
f01cbd3f | 279 | const struct xattr_handler btrfs_xattr_acl_access_handler = { |
5103e947 | 280 | .prefix = POSIX_ACL_XATTR_ACCESS, |
431547b3 CH |
281 | .flags = ACL_TYPE_ACCESS, |
282 | .get = btrfs_xattr_acl_get, | |
283 | .set = btrfs_xattr_acl_set, | |
5103e947 | 284 | }; |
eab922ec | 285 | |
0eda294d | 286 | #else /* CONFIG_BTRFS_FS_POSIX_ACL */ |
eab922ec JB |
287 | |
288 | int btrfs_acl_chmod(struct inode *inode) | |
289 | { | |
290 | return 0; | |
291 | } | |
292 | ||
f34f57a3 YZ |
293 | int btrfs_init_acl(struct btrfs_trans_handle *trans, |
294 | struct inode *inode, struct inode *dir) | |
eab922ec JB |
295 | { |
296 | return 0; | |
297 | } | |
298 | ||
0eda294d | 299 | #endif /* CONFIG_BTRFS_FS_POSIX_ACL */ |