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929fb014 TY |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * acl.c | |
5 | * | |
6 | * Copyright (C) 2004, 2008 Oracle. All rights reserved. | |
7 | * | |
8 | * CREDITS: | |
9 | * Lots of code in this file is copy from linux/fs/ext3/acl.c. | |
10 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public | |
14 | * License version 2 as published by the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/string.h> | |
25 | ||
26 | #define MLOG_MASK_PREFIX ML_INODE | |
27 | #include <cluster/masklog.h> | |
28 | ||
29 | #include "ocfs2.h" | |
30 | #include "alloc.h" | |
31 | #include "dlmglue.h" | |
32 | #include "file.h" | |
33 | #include "ocfs2_fs.h" | |
34 | ||
35 | #include "xattr.h" | |
36 | #include "acl.h" | |
37 | ||
38 | /* | |
39 | * Convert from xattr value to acl struct. | |
40 | */ | |
41 | static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) | |
42 | { | |
43 | int n, count; | |
44 | struct posix_acl *acl; | |
45 | ||
46 | if (!value) | |
47 | return NULL; | |
48 | if (size < sizeof(struct posix_acl_entry)) | |
49 | return ERR_PTR(-EINVAL); | |
50 | ||
51 | count = size / sizeof(struct posix_acl_entry); | |
52 | if (count < 0) | |
53 | return ERR_PTR(-EINVAL); | |
54 | if (count == 0) | |
55 | return NULL; | |
56 | ||
57 | acl = posix_acl_alloc(count, GFP_NOFS); | |
58 | if (!acl) | |
59 | return ERR_PTR(-ENOMEM); | |
60 | for (n = 0; n < count; n++) { | |
61 | struct ocfs2_acl_entry *entry = | |
62 | (struct ocfs2_acl_entry *)value; | |
63 | ||
64 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); | |
65 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); | |
66 | acl->a_entries[n].e_id = le32_to_cpu(entry->e_id); | |
67 | value += sizeof(struct posix_acl_entry); | |
68 | ||
69 | } | |
70 | return acl; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Convert acl struct to xattr value. | |
75 | */ | |
76 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) | |
77 | { | |
78 | struct ocfs2_acl_entry *entry = NULL; | |
79 | char *ocfs2_acl; | |
80 | size_t n; | |
81 | ||
82 | *size = acl->a_count * sizeof(struct posix_acl_entry); | |
83 | ||
84 | ocfs2_acl = kmalloc(*size, GFP_NOFS); | |
85 | if (!ocfs2_acl) | |
86 | return ERR_PTR(-ENOMEM); | |
87 | ||
88 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; | |
89 | for (n = 0; n < acl->a_count; n++, entry++) { | |
90 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); | |
91 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); | |
92 | entry->e_id = cpu_to_le32(acl->a_entries[n].e_id); | |
93 | } | |
94 | return ocfs2_acl; | |
95 | } | |
96 | ||
97 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, | |
98 | int type, | |
99 | struct buffer_head *di_bh) | |
100 | { | |
929fb014 TY |
101 | int name_index; |
102 | char *value = NULL; | |
103 | struct posix_acl *acl; | |
104 | int retval; | |
105 | ||
929fb014 TY |
106 | switch (type) { |
107 | case ACL_TYPE_ACCESS: | |
108 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
109 | break; | |
110 | case ACL_TYPE_DEFAULT: | |
111 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
112 | break; | |
113 | default: | |
114 | return ERR_PTR(-EINVAL); | |
115 | } | |
116 | ||
117 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); | |
118 | if (retval > 0) { | |
119 | value = kmalloc(retval, GFP_NOFS); | |
120 | if (!value) | |
121 | return ERR_PTR(-ENOMEM); | |
122 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, | |
123 | "", value, retval); | |
124 | } | |
125 | ||
126 | if (retval > 0) | |
127 | acl = ocfs2_acl_from_xattr(value, retval); | |
128 | else if (retval == -ENODATA || retval == 0) | |
129 | acl = NULL; | |
130 | else | |
131 | acl = ERR_PTR(retval); | |
132 | ||
133 | kfree(value); | |
134 | ||
135 | return acl; | |
136 | } | |
137 | ||
138 | ||
139 | /* | |
140 | * Get posix acl. | |
141 | */ | |
142 | static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type) | |
143 | { | |
144 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
145 | struct buffer_head *di_bh = NULL; | |
146 | struct posix_acl *acl; | |
147 | int ret; | |
148 | ||
149 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
150 | return NULL; | |
151 | ||
152 | ret = ocfs2_inode_lock(inode, &di_bh, 0); | |
153 | if (ret < 0) { | |
154 | mlog_errno(ret); | |
155 | acl = ERR_PTR(ret); | |
156 | return acl; | |
157 | } | |
158 | ||
159 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); | |
160 | ||
161 | ocfs2_inode_unlock(inode, 0); | |
162 | ||
163 | brelse(di_bh); | |
164 | ||
165 | return acl; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Set the access or default ACL of an inode. | |
170 | */ | |
171 | static int ocfs2_set_acl(handle_t *handle, | |
172 | struct inode *inode, | |
173 | struct buffer_head *di_bh, | |
174 | int type, | |
175 | struct posix_acl *acl, | |
176 | struct ocfs2_alloc_context *meta_ac, | |
177 | struct ocfs2_alloc_context *data_ac) | |
178 | { | |
179 | int name_index; | |
180 | void *value = NULL; | |
181 | size_t size = 0; | |
182 | int ret; | |
183 | ||
184 | if (S_ISLNK(inode->i_mode)) | |
185 | return -EOPNOTSUPP; | |
186 | ||
187 | switch (type) { | |
188 | case ACL_TYPE_ACCESS: | |
189 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
190 | if (acl) { | |
191 | mode_t mode = inode->i_mode; | |
192 | ret = posix_acl_equiv_mode(acl, &mode); | |
193 | if (ret < 0) | |
194 | return ret; | |
195 | else { | |
196 | inode->i_mode = mode; | |
197 | if (ret == 0) | |
198 | acl = NULL; | |
199 | } | |
200 | } | |
201 | break; | |
202 | case ACL_TYPE_DEFAULT: | |
203 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
204 | if (!S_ISDIR(inode->i_mode)) | |
205 | return acl ? -EACCES : 0; | |
206 | break; | |
207 | default: | |
208 | return -EINVAL; | |
209 | } | |
210 | ||
211 | if (acl) { | |
212 | value = ocfs2_acl_to_xattr(acl, &size); | |
213 | if (IS_ERR(value)) | |
214 | return (int)PTR_ERR(value); | |
215 | } | |
216 | ||
217 | if (handle) | |
218 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, | |
219 | "", value, size, 0, | |
220 | meta_ac, data_ac); | |
221 | else | |
222 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); | |
223 | ||
224 | kfree(value); | |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
23fc2702 TY |
229 | int ocfs2_check_acl(struct inode *inode, int mask) |
230 | { | |
231 | struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); | |
232 | ||
233 | if (IS_ERR(acl)) | |
234 | return PTR_ERR(acl); | |
235 | if (acl) { | |
236 | int ret = posix_acl_permission(inode, acl, mask); | |
237 | posix_acl_release(acl); | |
238 | return ret; | |
239 | } | |
240 | ||
241 | return -EAGAIN; | |
242 | } | |
243 | ||
060bc66d TY |
244 | int ocfs2_acl_chmod(struct inode *inode) |
245 | { | |
246 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
247 | struct posix_acl *acl, *clone; | |
248 | int ret; | |
249 | ||
250 | if (S_ISLNK(inode->i_mode)) | |
251 | return -EOPNOTSUPP; | |
252 | ||
253 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
254 | return 0; | |
255 | ||
256 | acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); | |
257 | if (IS_ERR(acl) || !acl) | |
258 | return PTR_ERR(acl); | |
259 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
260 | posix_acl_release(acl); | |
261 | if (!clone) | |
262 | return -ENOMEM; | |
263 | ret = posix_acl_chmod_masq(clone, inode->i_mode); | |
264 | if (!ret) | |
265 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, | |
266 | clone, NULL, NULL); | |
267 | posix_acl_release(clone); | |
268 | return ret; | |
269 | } | |
270 | ||
89c38bd0 TY |
271 | /* |
272 | * Initialize the ACLs of a new inode. If parent directory has default ACL, | |
273 | * then clone to new inode. Called from ocfs2_mknod. | |
274 | */ | |
275 | int ocfs2_init_acl(handle_t *handle, | |
276 | struct inode *inode, | |
277 | struct inode *dir, | |
278 | struct buffer_head *di_bh, | |
279 | struct buffer_head *dir_bh, | |
280 | struct ocfs2_alloc_context *meta_ac, | |
281 | struct ocfs2_alloc_context *data_ac) | |
282 | { | |
283 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
284 | struct posix_acl *acl = NULL; | |
285 | int ret = 0; | |
286 | ||
287 | if (!S_ISLNK(inode->i_mode)) { | |
288 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { | |
289 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, | |
290 | dir_bh); | |
291 | if (IS_ERR(acl)) | |
292 | return PTR_ERR(acl); | |
293 | } | |
294 | if (!acl) | |
ce3b0f8d | 295 | inode->i_mode &= ~current_umask(); |
89c38bd0 TY |
296 | } |
297 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { | |
298 | struct posix_acl *clone; | |
299 | mode_t mode; | |
300 | ||
301 | if (S_ISDIR(inode->i_mode)) { | |
302 | ret = ocfs2_set_acl(handle, inode, di_bh, | |
303 | ACL_TYPE_DEFAULT, acl, | |
304 | meta_ac, data_ac); | |
305 | if (ret) | |
306 | goto cleanup; | |
307 | } | |
308 | clone = posix_acl_clone(acl, GFP_NOFS); | |
309 | ret = -ENOMEM; | |
310 | if (!clone) | |
311 | goto cleanup; | |
312 | ||
313 | mode = inode->i_mode; | |
314 | ret = posix_acl_create_masq(clone, &mode); | |
315 | if (ret >= 0) { | |
316 | inode->i_mode = mode; | |
317 | if (ret > 0) { | |
318 | ret = ocfs2_set_acl(handle, inode, | |
319 | di_bh, ACL_TYPE_ACCESS, | |
320 | clone, meta_ac, data_ac); | |
321 | } | |
322 | } | |
323 | posix_acl_release(clone); | |
324 | } | |
325 | cleanup: | |
326 | posix_acl_release(acl); | |
327 | return ret; | |
328 | } | |
329 | ||
431547b3 | 330 | static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry, |
929fb014 TY |
331 | char *list, |
332 | size_t list_len, | |
333 | const char *name, | |
431547b3 CH |
334 | size_t name_len, |
335 | int type) | |
929fb014 | 336 | { |
431547b3 | 337 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
929fb014 TY |
338 | const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS); |
339 | ||
340 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
341 | return 0; | |
342 | ||
343 | if (list && size <= list_len) | |
344 | memcpy(list, POSIX_ACL_XATTR_ACCESS, size); | |
345 | return size; | |
346 | } | |
347 | ||
431547b3 | 348 | static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry, |
929fb014 TY |
349 | char *list, |
350 | size_t list_len, | |
351 | const char *name, | |
431547b3 CH |
352 | size_t name_len, |
353 | int type) | |
929fb014 | 354 | { |
431547b3 | 355 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
929fb014 TY |
356 | const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT); |
357 | ||
358 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
359 | return 0; | |
360 | ||
361 | if (list && size <= list_len) | |
362 | memcpy(list, POSIX_ACL_XATTR_DEFAULT, size); | |
363 | return size; | |
364 | } | |
365 | ||
431547b3 CH |
366 | static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name, |
367 | void *buffer, size_t size, int type) | |
929fb014 | 368 | { |
431547b3 | 369 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
929fb014 TY |
370 | struct posix_acl *acl; |
371 | int ret; | |
372 | ||
431547b3 CH |
373 | if (strcmp(name, "") != 0) |
374 | return -EINVAL; | |
929fb014 TY |
375 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
376 | return -EOPNOTSUPP; | |
377 | ||
431547b3 | 378 | acl = ocfs2_get_acl(dentry->d_inode, type); |
929fb014 TY |
379 | if (IS_ERR(acl)) |
380 | return PTR_ERR(acl); | |
381 | if (acl == NULL) | |
382 | return -ENODATA; | |
383 | ret = posix_acl_to_xattr(acl, buffer, size); | |
384 | posix_acl_release(acl); | |
385 | ||
386 | return ret; | |
387 | } | |
388 | ||
431547b3 CH |
389 | static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name, |
390 | const void *value, size_t size, int flags, int type) | |
929fb014 | 391 | { |
431547b3 | 392 | struct inode *inode = dentry->d_inode; |
929fb014 TY |
393 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
394 | struct posix_acl *acl; | |
395 | int ret = 0; | |
396 | ||
431547b3 CH |
397 | if (strcmp(name, "") != 0) |
398 | return -EINVAL; | |
929fb014 TY |
399 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
400 | return -EOPNOTSUPP; | |
401 | ||
402 | if (!is_owner_or_cap(inode)) | |
403 | return -EPERM; | |
404 | ||
405 | if (value) { | |
406 | acl = posix_acl_from_xattr(value, size); | |
407 | if (IS_ERR(acl)) | |
408 | return PTR_ERR(acl); | |
409 | else if (acl) { | |
410 | ret = posix_acl_valid(acl); | |
411 | if (ret) | |
412 | goto cleanup; | |
413 | } | |
414 | } else | |
415 | acl = NULL; | |
416 | ||
417 | ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL); | |
418 | ||
419 | cleanup: | |
420 | posix_acl_release(acl); | |
421 | return ret; | |
422 | } | |
423 | ||
929fb014 TY |
424 | struct xattr_handler ocfs2_xattr_acl_access_handler = { |
425 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
431547b3 | 426 | .flags = ACL_TYPE_ACCESS, |
929fb014 | 427 | .list = ocfs2_xattr_list_acl_access, |
431547b3 CH |
428 | .get = ocfs2_xattr_get_acl, |
429 | .set = ocfs2_xattr_set_acl, | |
929fb014 TY |
430 | }; |
431 | ||
432 | struct xattr_handler ocfs2_xattr_acl_default_handler = { | |
433 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
431547b3 | 434 | .flags = ACL_TYPE_DEFAULT, |
929fb014 | 435 | .list = ocfs2_xattr_list_acl_default, |
431547b3 CH |
436 | .get = ocfs2_xattr_get_acl, |
437 | .set = ocfs2_xattr_set_acl, | |
929fb014 | 438 | }; |