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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 | { | |
101 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
102 | int name_index; | |
103 | char *value = NULL; | |
104 | struct posix_acl *acl; | |
105 | int retval; | |
106 | ||
107 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
108 | return NULL; | |
109 | ||
110 | switch (type) { | |
111 | case ACL_TYPE_ACCESS: | |
112 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
113 | break; | |
114 | case ACL_TYPE_DEFAULT: | |
115 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
116 | break; | |
117 | default: | |
118 | return ERR_PTR(-EINVAL); | |
119 | } | |
120 | ||
121 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); | |
122 | if (retval > 0) { | |
123 | value = kmalloc(retval, GFP_NOFS); | |
124 | if (!value) | |
125 | return ERR_PTR(-ENOMEM); | |
126 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, | |
127 | "", value, retval); | |
128 | } | |
129 | ||
130 | if (retval > 0) | |
131 | acl = ocfs2_acl_from_xattr(value, retval); | |
132 | else if (retval == -ENODATA || retval == 0) | |
133 | acl = NULL; | |
134 | else | |
135 | acl = ERR_PTR(retval); | |
136 | ||
137 | kfree(value); | |
138 | ||
139 | return acl; | |
140 | } | |
141 | ||
142 | ||
143 | /* | |
144 | * Get posix acl. | |
145 | */ | |
146 | static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type) | |
147 | { | |
148 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
149 | struct buffer_head *di_bh = NULL; | |
150 | struct posix_acl *acl; | |
151 | int ret; | |
152 | ||
153 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
154 | return NULL; | |
155 | ||
156 | ret = ocfs2_inode_lock(inode, &di_bh, 0); | |
157 | if (ret < 0) { | |
158 | mlog_errno(ret); | |
159 | acl = ERR_PTR(ret); | |
160 | return acl; | |
161 | } | |
162 | ||
163 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); | |
164 | ||
165 | ocfs2_inode_unlock(inode, 0); | |
166 | ||
167 | brelse(di_bh); | |
168 | ||
169 | return acl; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Set the access or default ACL of an inode. | |
174 | */ | |
175 | static int ocfs2_set_acl(handle_t *handle, | |
176 | struct inode *inode, | |
177 | struct buffer_head *di_bh, | |
178 | int type, | |
179 | struct posix_acl *acl, | |
180 | struct ocfs2_alloc_context *meta_ac, | |
181 | struct ocfs2_alloc_context *data_ac) | |
182 | { | |
183 | int name_index; | |
184 | void *value = NULL; | |
185 | size_t size = 0; | |
186 | int ret; | |
187 | ||
188 | if (S_ISLNK(inode->i_mode)) | |
189 | return -EOPNOTSUPP; | |
190 | ||
191 | switch (type) { | |
192 | case ACL_TYPE_ACCESS: | |
193 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
194 | if (acl) { | |
195 | mode_t mode = inode->i_mode; | |
196 | ret = posix_acl_equiv_mode(acl, &mode); | |
197 | if (ret < 0) | |
198 | return ret; | |
199 | else { | |
200 | inode->i_mode = mode; | |
201 | if (ret == 0) | |
202 | acl = NULL; | |
203 | } | |
204 | } | |
205 | break; | |
206 | case ACL_TYPE_DEFAULT: | |
207 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
208 | if (!S_ISDIR(inode->i_mode)) | |
209 | return acl ? -EACCES : 0; | |
210 | break; | |
211 | default: | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
215 | if (acl) { | |
216 | value = ocfs2_acl_to_xattr(acl, &size); | |
217 | if (IS_ERR(value)) | |
218 | return (int)PTR_ERR(value); | |
219 | } | |
220 | ||
221 | if (handle) | |
222 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, | |
223 | "", value, size, 0, | |
224 | meta_ac, data_ac); | |
225 | else | |
226 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); | |
227 | ||
228 | kfree(value); | |
229 | ||
230 | return ret; | |
231 | } | |
232 | ||
23fc2702 TY |
233 | int ocfs2_check_acl(struct inode *inode, int mask) |
234 | { | |
235 | struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); | |
236 | ||
237 | if (IS_ERR(acl)) | |
238 | return PTR_ERR(acl); | |
239 | if (acl) { | |
240 | int ret = posix_acl_permission(inode, acl, mask); | |
241 | posix_acl_release(acl); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | return -EAGAIN; | |
246 | } | |
247 | ||
060bc66d TY |
248 | int ocfs2_acl_chmod(struct inode *inode) |
249 | { | |
250 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
251 | struct posix_acl *acl, *clone; | |
252 | int ret; | |
253 | ||
254 | if (S_ISLNK(inode->i_mode)) | |
255 | return -EOPNOTSUPP; | |
256 | ||
257 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
258 | return 0; | |
259 | ||
260 | acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); | |
261 | if (IS_ERR(acl) || !acl) | |
262 | return PTR_ERR(acl); | |
263 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
264 | posix_acl_release(acl); | |
265 | if (!clone) | |
266 | return -ENOMEM; | |
267 | ret = posix_acl_chmod_masq(clone, inode->i_mode); | |
268 | if (!ret) | |
269 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, | |
270 | clone, NULL, NULL); | |
271 | posix_acl_release(clone); | |
272 | return ret; | |
273 | } | |
274 | ||
89c38bd0 TY |
275 | /* |
276 | * Initialize the ACLs of a new inode. If parent directory has default ACL, | |
277 | * then clone to new inode. Called from ocfs2_mknod. | |
278 | */ | |
279 | int ocfs2_init_acl(handle_t *handle, | |
280 | struct inode *inode, | |
281 | struct inode *dir, | |
282 | struct buffer_head *di_bh, | |
283 | struct buffer_head *dir_bh, | |
284 | struct ocfs2_alloc_context *meta_ac, | |
285 | struct ocfs2_alloc_context *data_ac) | |
286 | { | |
287 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
288 | struct posix_acl *acl = NULL; | |
289 | int ret = 0; | |
290 | ||
291 | if (!S_ISLNK(inode->i_mode)) { | |
292 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { | |
293 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, | |
294 | dir_bh); | |
295 | if (IS_ERR(acl)) | |
296 | return PTR_ERR(acl); | |
297 | } | |
298 | if (!acl) | |
ce3b0f8d | 299 | inode->i_mode &= ~current_umask(); |
89c38bd0 TY |
300 | } |
301 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { | |
302 | struct posix_acl *clone; | |
303 | mode_t mode; | |
304 | ||
305 | if (S_ISDIR(inode->i_mode)) { | |
306 | ret = ocfs2_set_acl(handle, inode, di_bh, | |
307 | ACL_TYPE_DEFAULT, acl, | |
308 | meta_ac, data_ac); | |
309 | if (ret) | |
310 | goto cleanup; | |
311 | } | |
312 | clone = posix_acl_clone(acl, GFP_NOFS); | |
313 | ret = -ENOMEM; | |
314 | if (!clone) | |
315 | goto cleanup; | |
316 | ||
317 | mode = inode->i_mode; | |
318 | ret = posix_acl_create_masq(clone, &mode); | |
319 | if (ret >= 0) { | |
320 | inode->i_mode = mode; | |
321 | if (ret > 0) { | |
322 | ret = ocfs2_set_acl(handle, inode, | |
323 | di_bh, ACL_TYPE_ACCESS, | |
324 | clone, meta_ac, data_ac); | |
325 | } | |
326 | } | |
327 | posix_acl_release(clone); | |
328 | } | |
329 | cleanup: | |
330 | posix_acl_release(acl); | |
331 | return ret; | |
332 | } | |
333 | ||
929fb014 TY |
334 | static size_t ocfs2_xattr_list_acl_access(struct inode *inode, |
335 | char *list, | |
336 | size_t list_len, | |
337 | const char *name, | |
338 | size_t name_len) | |
339 | { | |
340 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
341 | const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS); | |
342 | ||
343 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
344 | return 0; | |
345 | ||
346 | if (list && size <= list_len) | |
347 | memcpy(list, POSIX_ACL_XATTR_ACCESS, size); | |
348 | return size; | |
349 | } | |
350 | ||
351 | static size_t ocfs2_xattr_list_acl_default(struct inode *inode, | |
352 | char *list, | |
353 | size_t list_len, | |
354 | const char *name, | |
355 | size_t name_len) | |
356 | { | |
357 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
358 | const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT); | |
359 | ||
360 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
361 | return 0; | |
362 | ||
363 | if (list && size <= list_len) | |
364 | memcpy(list, POSIX_ACL_XATTR_DEFAULT, size); | |
365 | return size; | |
366 | } | |
367 | ||
368 | static int ocfs2_xattr_get_acl(struct inode *inode, | |
369 | int type, | |
370 | void *buffer, | |
371 | size_t size) | |
372 | { | |
373 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
374 | struct posix_acl *acl; | |
375 | int ret; | |
376 | ||
377 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
378 | return -EOPNOTSUPP; | |
379 | ||
380 | acl = ocfs2_get_acl(inode, type); | |
381 | if (IS_ERR(acl)) | |
382 | return PTR_ERR(acl); | |
383 | if (acl == NULL) | |
384 | return -ENODATA; | |
385 | ret = posix_acl_to_xattr(acl, buffer, size); | |
386 | posix_acl_release(acl); | |
387 | ||
388 | return ret; | |
389 | } | |
390 | ||
391 | static int ocfs2_xattr_get_acl_access(struct inode *inode, | |
392 | const char *name, | |
393 | void *buffer, | |
394 | size_t size) | |
395 | { | |
396 | if (strcmp(name, "") != 0) | |
397 | return -EINVAL; | |
398 | return ocfs2_xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size); | |
399 | } | |
400 | ||
401 | static int ocfs2_xattr_get_acl_default(struct inode *inode, | |
402 | const char *name, | |
403 | void *buffer, | |
404 | size_t size) | |
405 | { | |
406 | if (strcmp(name, "") != 0) | |
407 | return -EINVAL; | |
408 | return ocfs2_xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size); | |
409 | } | |
410 | ||
411 | static int ocfs2_xattr_set_acl(struct inode *inode, | |
412 | int type, | |
413 | const void *value, | |
414 | size_t size) | |
415 | { | |
416 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
417 | struct posix_acl *acl; | |
418 | int ret = 0; | |
419 | ||
420 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
421 | return -EOPNOTSUPP; | |
422 | ||
423 | if (!is_owner_or_cap(inode)) | |
424 | return -EPERM; | |
425 | ||
426 | if (value) { | |
427 | acl = posix_acl_from_xattr(value, size); | |
428 | if (IS_ERR(acl)) | |
429 | return PTR_ERR(acl); | |
430 | else if (acl) { | |
431 | ret = posix_acl_valid(acl); | |
432 | if (ret) | |
433 | goto cleanup; | |
434 | } | |
435 | } else | |
436 | acl = NULL; | |
437 | ||
438 | ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL); | |
439 | ||
440 | cleanup: | |
441 | posix_acl_release(acl); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | static int ocfs2_xattr_set_acl_access(struct inode *inode, | |
446 | const char *name, | |
447 | const void *value, | |
448 | size_t size, | |
449 | int flags) | |
450 | { | |
451 | if (strcmp(name, "") != 0) | |
452 | return -EINVAL; | |
453 | return ocfs2_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size); | |
454 | } | |
455 | ||
456 | static int ocfs2_xattr_set_acl_default(struct inode *inode, | |
457 | const char *name, | |
458 | const void *value, | |
459 | size_t size, | |
460 | int flags) | |
461 | { | |
462 | if (strcmp(name, "") != 0) | |
463 | return -EINVAL; | |
464 | return ocfs2_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size); | |
465 | } | |
466 | ||
467 | struct xattr_handler ocfs2_xattr_acl_access_handler = { | |
468 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
469 | .list = ocfs2_xattr_list_acl_access, | |
470 | .get = ocfs2_xattr_get_acl_access, | |
471 | .set = ocfs2_xattr_set_acl_access, | |
472 | }; | |
473 | ||
474 | struct xattr_handler ocfs2_xattr_acl_default_handler = { | |
475 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
476 | .list = ocfs2_xattr_list_acl_default, | |
477 | .get = ocfs2_xattr_get_acl_default, | |
478 | .set = ocfs2_xattr_set_acl_default, | |
479 | }; |