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1 | /* |
2 | * linux/fs/ceph/acl.c | |
3 | * | |
4 | * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public | |
8 | * License v2 as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public | |
16 | * License along with this program; if not, write to the | |
17 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | * Boston, MA 021110-1307, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/ceph/ceph_debug.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/xattr.h> | |
25 | #include <linux/posix_acl_xattr.h> | |
26 | #include <linux/posix_acl.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include "super.h" | |
31 | ||
32 | static inline void ceph_set_cached_acl(struct inode *inode, | |
33 | int type, struct posix_acl *acl) | |
34 | { | |
35 | struct ceph_inode_info *ci = ceph_inode(inode); | |
36 | ||
37 | spin_lock(&ci->i_ceph_lock); | |
38 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) | |
39 | set_cached_acl(inode, type, acl); | |
40 | spin_unlock(&ci->i_ceph_lock); | |
41 | } | |
42 | ||
43 | static inline struct posix_acl *ceph_get_cached_acl(struct inode *inode, | |
44 | int type) | |
45 | { | |
46 | struct ceph_inode_info *ci = ceph_inode(inode); | |
47 | struct posix_acl *acl = ACL_NOT_CACHED; | |
48 | ||
49 | spin_lock(&ci->i_ceph_lock); | |
50 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) | |
51 | acl = get_cached_acl(inode, type); | |
52 | spin_unlock(&ci->i_ceph_lock); | |
53 | ||
54 | return acl; | |
55 | } | |
56 | ||
57 | void ceph_forget_all_cached_acls(struct inode *inode) | |
58 | { | |
59 | forget_all_cached_acls(inode); | |
60 | } | |
61 | ||
62 | struct posix_acl *ceph_get_acl(struct inode *inode, int type) | |
63 | { | |
64 | int size; | |
65 | const char *name; | |
66 | char *value = NULL; | |
67 | struct posix_acl *acl; | |
68 | ||
69 | if (!IS_POSIXACL(inode)) | |
70 | return NULL; | |
71 | ||
72 | acl = ceph_get_cached_acl(inode, type); | |
73 | if (acl != ACL_NOT_CACHED) | |
74 | return acl; | |
75 | ||
76 | switch (type) { | |
77 | case ACL_TYPE_ACCESS: | |
78 | name = POSIX_ACL_XATTR_ACCESS; | |
79 | break; | |
80 | case ACL_TYPE_DEFAULT: | |
81 | name = POSIX_ACL_XATTR_DEFAULT; | |
82 | break; | |
83 | default: | |
84 | BUG(); | |
85 | } | |
86 | ||
87 | size = __ceph_getxattr(inode, name, "", 0); | |
88 | if (size > 0) { | |
89 | value = kzalloc(size, GFP_NOFS); | |
90 | if (!value) | |
91 | return ERR_PTR(-ENOMEM); | |
92 | size = __ceph_getxattr(inode, name, value, size); | |
93 | } | |
94 | ||
95 | if (size > 0) | |
96 | acl = posix_acl_from_xattr(&init_user_ns, value, size); | |
97 | else if (size == -ERANGE || size == -ENODATA || size == 0) | |
98 | acl = NULL; | |
99 | else | |
100 | acl = ERR_PTR(-EIO); | |
101 | ||
102 | kfree(value); | |
103 | ||
104 | if (!IS_ERR(acl)) | |
105 | ceph_set_cached_acl(inode, type, acl); | |
106 | ||
107 | return acl; | |
108 | } | |
109 | ||
110 | static int ceph_set_acl(struct dentry *dentry, struct inode *inode, | |
111 | struct posix_acl *acl, int type) | |
112 | { | |
113 | int ret = 0, size = 0; | |
114 | const char *name = NULL; | |
115 | char *value = NULL; | |
116 | struct iattr newattrs; | |
117 | umode_t new_mode = inode->i_mode, old_mode = inode->i_mode; | |
118 | ||
119 | if (acl) { | |
120 | ret = posix_acl_valid(acl); | |
121 | if (ret < 0) | |
122 | goto out; | |
123 | } | |
124 | ||
125 | switch (type) { | |
126 | case ACL_TYPE_ACCESS: | |
127 | name = POSIX_ACL_XATTR_ACCESS; | |
128 | if (acl) { | |
129 | ret = posix_acl_equiv_mode(acl, &new_mode); | |
130 | if (ret < 0) | |
131 | goto out; | |
132 | if (ret == 0) | |
133 | acl = NULL; | |
134 | } | |
135 | break; | |
136 | case ACL_TYPE_DEFAULT: | |
137 | if (!S_ISDIR(inode->i_mode)) { | |
138 | ret = acl ? -EINVAL : 0; | |
139 | goto out; | |
140 | } | |
141 | name = POSIX_ACL_XATTR_DEFAULT; | |
142 | break; | |
143 | default: | |
144 | ret = -EINVAL; | |
145 | goto out; | |
146 | } | |
147 | ||
148 | if (acl) { | |
149 | size = posix_acl_xattr_size(acl->a_count); | |
150 | value = kmalloc(size, GFP_NOFS); | |
151 | if (!value) { | |
152 | ret = -ENOMEM; | |
153 | goto out; | |
154 | } | |
155 | ||
156 | ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); | |
157 | if (ret < 0) | |
158 | goto out_free; | |
159 | } | |
160 | ||
161 | if (new_mode != old_mode) { | |
162 | newattrs.ia_mode = new_mode; | |
163 | newattrs.ia_valid = ATTR_MODE; | |
164 | ret = ceph_setattr(dentry, &newattrs); | |
165 | if (ret) | |
166 | goto out_free; | |
167 | } | |
168 | ||
169 | if (value) | |
170 | ret = __ceph_setxattr(dentry, name, value, size, 0); | |
171 | else | |
172 | ret = __ceph_removexattr(dentry, name); | |
173 | ||
174 | if (ret) { | |
175 | if (new_mode != old_mode) { | |
176 | newattrs.ia_mode = old_mode; | |
177 | newattrs.ia_valid = ATTR_MODE; | |
178 | ceph_setattr(dentry, &newattrs); | |
179 | } | |
180 | goto out_free; | |
181 | } | |
182 | ||
183 | ceph_set_cached_acl(inode, type, acl); | |
184 | ||
185 | out_free: | |
186 | kfree(value); | |
187 | out: | |
188 | return ret; | |
189 | } | |
190 | ||
191 | int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir) | |
192 | { | |
193 | struct posix_acl *acl = NULL; | |
194 | int ret = 0; | |
195 | ||
196 | if (!S_ISLNK(inode->i_mode)) { | |
197 | if (IS_POSIXACL(dir)) { | |
198 | acl = ceph_get_acl(dir, ACL_TYPE_DEFAULT); | |
199 | if (IS_ERR(acl)) { | |
200 | ret = PTR_ERR(acl); | |
201 | goto out; | |
202 | } | |
203 | } | |
204 | ||
205 | if (!acl) | |
206 | inode->i_mode &= ~current_umask(); | |
207 | } | |
208 | ||
209 | if (IS_POSIXACL(dir) && acl) { | |
210 | if (S_ISDIR(inode->i_mode)) { | |
211 | ret = ceph_set_acl(dentry, inode, acl, | |
212 | ACL_TYPE_DEFAULT); | |
213 | if (ret) | |
214 | goto out_release; | |
215 | } | |
216 | ret = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode); | |
217 | if (ret < 0) | |
218 | goto out; | |
219 | else if (ret > 0) | |
220 | ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS); | |
221 | else | |
222 | cache_no_acl(inode); | |
223 | } else { | |
224 | cache_no_acl(inode); | |
225 | } | |
226 | ||
227 | out_release: | |
228 | posix_acl_release(acl); | |
229 | out: | |
230 | return ret; | |
231 | } | |
232 | ||
233 | int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) | |
234 | { | |
235 | struct posix_acl *acl; | |
236 | int ret = 0; | |
237 | ||
238 | if (S_ISLNK(inode->i_mode)) { | |
239 | ret = -EOPNOTSUPP; | |
240 | goto out; | |
241 | } | |
242 | ||
243 | if (!IS_POSIXACL(inode)) | |
244 | goto out; | |
245 | ||
246 | acl = ceph_get_acl(inode, ACL_TYPE_ACCESS); | |
247 | if (IS_ERR_OR_NULL(acl)) { | |
248 | ret = PTR_ERR(acl); | |
249 | goto out; | |
250 | } | |
251 | ||
252 | ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); | |
253 | if (ret) | |
254 | goto out; | |
255 | ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS); | |
256 | posix_acl_release(acl); | |
257 | out: | |
258 | return ret; | |
259 | } | |
260 | ||
261 | static int ceph_xattr_acl_get(struct dentry *dentry, const char *name, | |
262 | void *value, size_t size, int type) | |
263 | { | |
264 | struct posix_acl *acl; | |
265 | int ret = 0; | |
266 | ||
267 | if (!IS_POSIXACL(dentry->d_inode)) | |
268 | return -EOPNOTSUPP; | |
269 | ||
270 | acl = ceph_get_acl(dentry->d_inode, type); | |
271 | if (IS_ERR(acl)) | |
272 | return PTR_ERR(acl); | |
273 | if (acl == NULL) | |
274 | return -ENODATA; | |
275 | ||
276 | ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); | |
277 | posix_acl_release(acl); | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | static int ceph_xattr_acl_set(struct dentry *dentry, const char *name, | |
283 | const void *value, size_t size, int flags, int type) | |
284 | { | |
285 | int ret = 0; | |
286 | struct posix_acl *acl = NULL; | |
287 | ||
288 | if (!inode_owner_or_capable(dentry->d_inode)) { | |
289 | ret = -EPERM; | |
290 | goto out; | |
291 | } | |
292 | ||
293 | if (!IS_POSIXACL(dentry->d_inode)) { | |
294 | ret = -EOPNOTSUPP; | |
295 | goto out; | |
296 | } | |
297 | ||
298 | if (value) { | |
299 | acl = posix_acl_from_xattr(&init_user_ns, value, size); | |
300 | if (IS_ERR(acl)) { | |
301 | ret = PTR_ERR(acl); | |
302 | goto out; | |
303 | } | |
304 | ||
305 | if (acl) { | |
306 | ret = posix_acl_valid(acl); | |
307 | if (ret) | |
308 | goto out_release; | |
309 | } | |
310 | } | |
311 | ||
312 | ret = ceph_set_acl(dentry, dentry->d_inode, acl, type); | |
313 | ||
314 | out_release: | |
315 | posix_acl_release(acl); | |
316 | out: | |
317 | return ret; | |
318 | } | |
319 | ||
320 | const struct xattr_handler ceph_xattr_acl_default_handler = { | |
321 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
322 | .flags = ACL_TYPE_DEFAULT, | |
323 | .get = ceph_xattr_acl_get, | |
324 | .set = ceph_xattr_acl_set, | |
325 | }; | |
326 | ||
327 | const struct xattr_handler ceph_xattr_acl_access_handler = { | |
328 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
329 | .flags = ACL_TYPE_ACCESS, | |
330 | .get = ceph_xattr_acl_get, | |
331 | .set = ceph_xattr_acl_set, | |
332 | }; |