Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/fs.h> |
2 | #include <linux/posix_acl.h> | |
3 | #include <linux/reiserfs_fs.h> | |
4 | #include <linux/errno.h> | |
5 | #include <linux/pagemap.h> | |
6 | #include <linux/xattr.h> | |
9a59f452 | 7 | #include <linux/posix_acl_xattr.h> |
1da177e4 LT |
8 | #include <linux/reiserfs_xattr.h> |
9 | #include <linux/reiserfs_acl.h> | |
10 | #include <asm/uaccess.h> | |
11 | ||
12 | static int reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl); | |
13 | ||
14 | static int | |
15 | xattr_set_acl(struct inode *inode, int type, const void *value, size_t size) | |
16 | { | |
17 | struct posix_acl *acl; | |
18 | int error; | |
19 | ||
20 | if (!reiserfs_posixacl(inode->i_sb)) | |
21 | return -EOPNOTSUPP; | |
22 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | |
23 | return -EPERM; | |
24 | ||
25 | if (value) { | |
26 | acl = posix_acl_from_xattr(value, size); | |
27 | if (IS_ERR(acl)) { | |
28 | return PTR_ERR(acl); | |
29 | } else if (acl) { | |
30 | error = posix_acl_valid(acl); | |
31 | if (error) | |
32 | goto release_and_out; | |
33 | } | |
34 | } else | |
35 | acl = NULL; | |
36 | ||
37 | error = reiserfs_set_acl (inode, type, acl); | |
38 | ||
39 | release_and_out: | |
40 | posix_acl_release(acl); | |
41 | return error; | |
42 | } | |
43 | ||
44 | ||
45 | static int | |
46 | xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size) | |
47 | { | |
48 | struct posix_acl *acl; | |
49 | int error; | |
50 | ||
51 | if (!reiserfs_posixacl(inode->i_sb)) | |
52 | return -EOPNOTSUPP; | |
53 | ||
54 | acl = reiserfs_get_acl (inode, type); | |
55 | if (IS_ERR(acl)) | |
56 | return PTR_ERR(acl); | |
57 | if (acl == NULL) | |
58 | return -ENODATA; | |
59 | error = posix_acl_to_xattr(acl, buffer, size); | |
60 | posix_acl_release(acl); | |
61 | ||
62 | return error; | |
63 | } | |
64 | ||
65 | ||
66 | /* | |
67 | * Convert from filesystem to in-memory representation. | |
68 | */ | |
69 | static struct posix_acl * | |
70 | posix_acl_from_disk(const void *value, size_t size) | |
71 | { | |
72 | const char *end = (char *)value + size; | |
73 | int n, count; | |
74 | struct posix_acl *acl; | |
75 | ||
76 | if (!value) | |
77 | return NULL; | |
78 | if (size < sizeof(reiserfs_acl_header)) | |
79 | return ERR_PTR(-EINVAL); | |
80 | if (((reiserfs_acl_header *)value)->a_version != | |
81 | cpu_to_le32(REISERFS_ACL_VERSION)) | |
82 | return ERR_PTR(-EINVAL); | |
83 | value = (char *)value + sizeof(reiserfs_acl_header); | |
84 | count = reiserfs_acl_count(size); | |
85 | if (count < 0) | |
86 | return ERR_PTR(-EINVAL); | |
87 | if (count == 0) | |
88 | return NULL; | |
89 | acl = posix_acl_alloc(count, GFP_NOFS); | |
90 | if (!acl) | |
91 | return ERR_PTR(-ENOMEM); | |
92 | for (n=0; n < count; n++) { | |
93 | reiserfs_acl_entry *entry = | |
94 | (reiserfs_acl_entry *)value; | |
95 | if ((char *)value + sizeof(reiserfs_acl_entry_short) > end) | |
96 | goto fail; | |
97 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); | |
98 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); | |
99 | switch(acl->a_entries[n].e_tag) { | |
100 | case ACL_USER_OBJ: | |
101 | case ACL_GROUP_OBJ: | |
102 | case ACL_MASK: | |
103 | case ACL_OTHER: | |
104 | value = (char *)value + | |
105 | sizeof(reiserfs_acl_entry_short); | |
106 | acl->a_entries[n].e_id = ACL_UNDEFINED_ID; | |
107 | break; | |
108 | ||
109 | case ACL_USER: | |
110 | case ACL_GROUP: | |
111 | value = (char *)value + sizeof(reiserfs_acl_entry); | |
112 | if ((char *)value > end) | |
113 | goto fail; | |
114 | acl->a_entries[n].e_id = | |
115 | le32_to_cpu(entry->e_id); | |
116 | break; | |
117 | ||
118 | default: | |
119 | goto fail; | |
120 | } | |
121 | } | |
122 | if (value != end) | |
123 | goto fail; | |
124 | return acl; | |
125 | ||
126 | fail: | |
127 | posix_acl_release(acl); | |
128 | return ERR_PTR(-EINVAL); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Convert from in-memory to filesystem representation. | |
133 | */ | |
134 | static void * | |
135 | posix_acl_to_disk(const struct posix_acl *acl, size_t *size) | |
136 | { | |
137 | reiserfs_acl_header *ext_acl; | |
138 | char *e; | |
139 | int n; | |
140 | ||
141 | *size = reiserfs_acl_size(acl->a_count); | |
142 | ext_acl = (reiserfs_acl_header *)kmalloc(sizeof(reiserfs_acl_header) + | |
143 | acl->a_count * sizeof(reiserfs_acl_entry), GFP_NOFS); | |
144 | if (!ext_acl) | |
145 | return ERR_PTR(-ENOMEM); | |
146 | ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION); | |
147 | e = (char *)ext_acl + sizeof(reiserfs_acl_header); | |
148 | for (n=0; n < acl->a_count; n++) { | |
149 | reiserfs_acl_entry *entry = (reiserfs_acl_entry *)e; | |
150 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); | |
151 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); | |
152 | switch(acl->a_entries[n].e_tag) { | |
153 | case ACL_USER: | |
154 | case ACL_GROUP: | |
155 | entry->e_id = | |
156 | cpu_to_le32(acl->a_entries[n].e_id); | |
157 | e += sizeof(reiserfs_acl_entry); | |
158 | break; | |
159 | ||
160 | case ACL_USER_OBJ: | |
161 | case ACL_GROUP_OBJ: | |
162 | case ACL_MASK: | |
163 | case ACL_OTHER: | |
164 | e += sizeof(reiserfs_acl_entry_short); | |
165 | break; | |
166 | ||
167 | default: | |
168 | goto fail; | |
169 | } | |
170 | } | |
171 | return (char *)ext_acl; | |
172 | ||
173 | fail: | |
174 | kfree(ext_acl); | |
175 | return ERR_PTR(-EINVAL); | |
176 | } | |
177 | ||
178 | /* | |
179 | * Inode operation get_posix_acl(). | |
180 | * | |
181 | * inode->i_sem: down | |
182 | * BKL held [before 2.5.x] | |
183 | */ | |
184 | struct posix_acl * | |
185 | reiserfs_get_acl(struct inode *inode, int type) | |
186 | { | |
187 | char *name, *value; | |
188 | struct posix_acl *acl, **p_acl; | |
189 | size_t size; | |
190 | int retval; | |
191 | struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode); | |
192 | ||
193 | switch (type) { | |
194 | case ACL_TYPE_ACCESS: | |
9a59f452 | 195 | name = POSIX_ACL_XATTR_ACCESS; |
1da177e4 LT |
196 | p_acl = &reiserfs_i->i_acl_access; |
197 | break; | |
198 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 199 | name = POSIX_ACL_XATTR_DEFAULT; |
1da177e4 LT |
200 | p_acl = &reiserfs_i->i_acl_default; |
201 | break; | |
202 | default: | |
203 | return ERR_PTR (-EINVAL); | |
204 | } | |
205 | ||
206 | if (IS_ERR (*p_acl)) { | |
207 | if (PTR_ERR (*p_acl) == -ENODATA) | |
208 | return NULL; | |
209 | } else if (*p_acl != NULL) | |
210 | return posix_acl_dup (*p_acl); | |
211 | ||
212 | size = reiserfs_xattr_get (inode, name, NULL, 0); | |
213 | if ((int)size < 0) { | |
214 | if (size == -ENODATA || size == -ENOSYS) { | |
215 | *p_acl = ERR_PTR (-ENODATA); | |
216 | return NULL; | |
217 | } | |
218 | return ERR_PTR (size); | |
219 | } | |
220 | ||
221 | value = kmalloc (size, GFP_NOFS); | |
222 | if (!value) | |
223 | return ERR_PTR (-ENOMEM); | |
224 | ||
225 | retval = reiserfs_xattr_get(inode, name, value, size); | |
226 | if (retval == -ENODATA || retval == -ENOSYS) { | |
227 | /* This shouldn't actually happen as it should have | |
228 | been caught above.. but just in case */ | |
229 | acl = NULL; | |
230 | *p_acl = ERR_PTR (-ENODATA); | |
231 | } else if (retval < 0) { | |
232 | acl = ERR_PTR(retval); | |
233 | } else { | |
234 | acl = posix_acl_from_disk(value, retval); | |
235 | *p_acl = posix_acl_dup (acl); | |
236 | } | |
237 | ||
238 | kfree(value); | |
239 | return acl; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Inode operation set_posix_acl(). | |
244 | * | |
245 | * inode->i_sem: down | |
246 | * BKL held [before 2.5.x] | |
247 | */ | |
248 | static int | |
249 | reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl) | |
250 | { | |
251 | char *name; | |
252 | void *value = NULL; | |
253 | struct posix_acl **p_acl; | |
254 | size_t size; | |
255 | int error; | |
256 | struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode); | |
257 | ||
258 | if (S_ISLNK(inode->i_mode)) | |
259 | return -EOPNOTSUPP; | |
260 | ||
261 | switch (type) { | |
262 | case ACL_TYPE_ACCESS: | |
9a59f452 | 263 | name = POSIX_ACL_XATTR_ACCESS; |
1da177e4 LT |
264 | p_acl = &reiserfs_i->i_acl_access; |
265 | if (acl) { | |
266 | mode_t mode = inode->i_mode; | |
267 | error = posix_acl_equiv_mode (acl, &mode); | |
268 | if (error < 0) | |
269 | return error; | |
270 | else { | |
271 | inode->i_mode = mode; | |
272 | if (error == 0) | |
273 | acl = NULL; | |
274 | } | |
275 | } | |
276 | break; | |
277 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 278 | name = POSIX_ACL_XATTR_DEFAULT; |
1da177e4 LT |
279 | p_acl = &reiserfs_i->i_acl_default; |
280 | if (!S_ISDIR (inode->i_mode)) | |
281 | return acl ? -EACCES : 0; | |
282 | break; | |
283 | default: | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
287 | if (acl) { | |
288 | value = posix_acl_to_disk(acl, &size); | |
289 | if (IS_ERR(value)) | |
290 | return (int)PTR_ERR(value); | |
291 | error = reiserfs_xattr_set(inode, name, value, size, 0); | |
292 | } else { | |
293 | error = reiserfs_xattr_del (inode, name); | |
294 | if (error == -ENODATA) { | |
295 | /* This may seem odd here, but it means that the ACL was set | |
296 | * with a value representable with mode bits. If there was | |
297 | * an ACL before, reiserfs_xattr_del already dirtied the inode. | |
298 | */ | |
299 | mark_inode_dirty (inode); | |
300 | error = 0; | |
301 | } | |
302 | } | |
303 | ||
304 | if (value) | |
305 | kfree(value); | |
306 | ||
307 | if (!error) { | |
308 | /* Release the old one */ | |
309 | if (!IS_ERR (*p_acl) && *p_acl) | |
310 | posix_acl_release (*p_acl); | |
311 | ||
312 | if (acl == NULL) | |
313 | *p_acl = ERR_PTR (-ENODATA); | |
314 | else | |
315 | *p_acl = posix_acl_dup (acl); | |
316 | } | |
317 | ||
318 | return error; | |
319 | } | |
320 | ||
321 | /* dir->i_sem: down, | |
322 | * inode is new and not released into the wild yet */ | |
323 | int | |
324 | reiserfs_inherit_default_acl (struct inode *dir, struct dentry *dentry, struct inode *inode) | |
325 | { | |
326 | struct posix_acl *acl; | |
327 | int err = 0; | |
328 | ||
329 | /* ACLs only get applied to files and directories */ | |
330 | if (S_ISLNK (inode->i_mode)) | |
331 | return 0; | |
332 | ||
333 | /* ACLs can only be used on "new" objects, so if it's an old object | |
334 | * there is nothing to inherit from */ | |
335 | if (get_inode_sd_version (dir) == STAT_DATA_V1) | |
336 | goto apply_umask; | |
337 | ||
338 | /* Don't apply ACLs to objects in the .reiserfs_priv tree.. This | |
339 | * would be useless since permissions are ignored, and a pain because | |
340 | * it introduces locking cycles */ | |
341 | if (is_reiserfs_priv_object (dir)) { | |
342 | reiserfs_mark_inode_private (inode); | |
343 | goto apply_umask; | |
344 | } | |
345 | ||
346 | acl = reiserfs_get_acl (dir, ACL_TYPE_DEFAULT); | |
347 | if (IS_ERR (acl)) { | |
348 | if (PTR_ERR (acl) == -ENODATA) | |
349 | goto apply_umask; | |
350 | return PTR_ERR (acl); | |
351 | } | |
352 | ||
353 | if (acl) { | |
354 | struct posix_acl *acl_copy; | |
355 | mode_t mode = inode->i_mode; | |
356 | int need_acl; | |
357 | ||
358 | /* Copy the default ACL to the default ACL of a new directory */ | |
359 | if (S_ISDIR (inode->i_mode)) { | |
360 | err = reiserfs_set_acl (inode, ACL_TYPE_DEFAULT, acl); | |
361 | if (err) | |
362 | goto cleanup; | |
363 | } | |
364 | ||
365 | /* Now we reconcile the new ACL and the mode, | |
366 | potentially modifying both */ | |
367 | acl_copy = posix_acl_clone (acl, GFP_NOFS); | |
368 | if (!acl_copy) { | |
369 | err = -ENOMEM; | |
370 | goto cleanup; | |
371 | } | |
372 | ||
373 | ||
374 | need_acl = posix_acl_create_masq (acl_copy, &mode); | |
375 | if (need_acl >= 0) { | |
376 | if (mode != inode->i_mode) { | |
377 | inode->i_mode = mode; | |
378 | } | |
379 | ||
380 | /* If we need an ACL.. */ | |
381 | if (need_acl > 0) { | |
382 | err = reiserfs_set_acl (inode, ACL_TYPE_ACCESS, acl_copy); | |
383 | if (err) | |
384 | goto cleanup_copy; | |
385 | } | |
386 | } | |
387 | cleanup_copy: | |
388 | posix_acl_release (acl_copy); | |
389 | cleanup: | |
390 | posix_acl_release (acl); | |
391 | } else { | |
392 | apply_umask: | |
393 | /* no ACL, apply umask */ | |
394 | inode->i_mode &= ~current->fs->umask; | |
395 | } | |
396 | ||
397 | return err; | |
398 | } | |
399 | ||
400 | /* Looks up and caches the result of the default ACL. | |
401 | * We do this so that we don't need to carry the xattr_sem into | |
402 | * reiserfs_new_inode if we don't need to */ | |
403 | int | |
404 | reiserfs_cache_default_acl (struct inode *inode) | |
405 | { | |
406 | int ret = 0; | |
407 | if (reiserfs_posixacl (inode->i_sb) && | |
408 | !is_reiserfs_priv_object (inode)) { | |
409 | struct posix_acl *acl; | |
410 | reiserfs_read_lock_xattr_i (inode); | |
411 | reiserfs_read_lock_xattrs (inode->i_sb); | |
412 | acl = reiserfs_get_acl (inode, ACL_TYPE_DEFAULT); | |
413 | reiserfs_read_unlock_xattrs (inode->i_sb); | |
414 | reiserfs_read_unlock_xattr_i (inode); | |
415 | ret = acl ? 1 : 0; | |
416 | posix_acl_release (acl); | |
417 | } | |
418 | ||
419 | return ret; | |
420 | } | |
421 | ||
422 | int | |
423 | reiserfs_acl_chmod (struct inode *inode) | |
424 | { | |
425 | struct posix_acl *acl, *clone; | |
426 | int error; | |
427 | ||
428 | if (S_ISLNK(inode->i_mode)) | |
429 | return -EOPNOTSUPP; | |
430 | ||
431 | if (get_inode_sd_version (inode) == STAT_DATA_V1 || | |
432 | !reiserfs_posixacl(inode->i_sb)) | |
433 | { | |
434 | return 0; | |
435 | } | |
436 | ||
437 | reiserfs_read_lock_xattrs (inode->i_sb); | |
438 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); | |
439 | reiserfs_read_unlock_xattrs (inode->i_sb); | |
440 | if (!acl) | |
441 | return 0; | |
442 | if (IS_ERR(acl)) | |
443 | return PTR_ERR(acl); | |
444 | clone = posix_acl_clone(acl, GFP_NOFS); | |
445 | posix_acl_release(acl); | |
446 | if (!clone) | |
447 | return -ENOMEM; | |
448 | error = posix_acl_chmod_masq(clone, inode->i_mode); | |
449 | if (!error) { | |
450 | int lock = !has_xattr_dir (inode); | |
451 | reiserfs_write_lock_xattr_i (inode); | |
452 | if (lock) | |
453 | reiserfs_write_lock_xattrs (inode->i_sb); | |
454 | else | |
455 | reiserfs_read_lock_xattrs (inode->i_sb); | |
456 | error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone); | |
457 | if (lock) | |
458 | reiserfs_write_unlock_xattrs (inode->i_sb); | |
459 | else | |
460 | reiserfs_read_unlock_xattrs (inode->i_sb); | |
461 | reiserfs_write_unlock_xattr_i (inode); | |
462 | } | |
463 | posix_acl_release(clone); | |
464 | return error; | |
465 | } | |
466 | ||
467 | static int | |
468 | posix_acl_access_get(struct inode *inode, const char *name, | |
469 | void *buffer, size_t size) | |
470 | { | |
9a59f452 | 471 | if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS)-1) |
1da177e4 LT |
472 | return -EINVAL; |
473 | return xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size); | |
474 | } | |
475 | ||
476 | static int | |
477 | posix_acl_access_set(struct inode *inode, const char *name, | |
478 | const void *value, size_t size, int flags) | |
479 | { | |
9a59f452 | 480 | if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS)-1) |
1da177e4 LT |
481 | return -EINVAL; |
482 | return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size); | |
483 | } | |
484 | ||
485 | static int | |
486 | posix_acl_access_del (struct inode *inode, const char *name) | |
487 | { | |
488 | struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode); | |
489 | struct posix_acl **acl = &reiserfs_i->i_acl_access; | |
9a59f452 | 490 | if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS)-1) |
1da177e4 LT |
491 | return -EINVAL; |
492 | if (!IS_ERR (*acl) && *acl) { | |
493 | posix_acl_release (*acl); | |
494 | *acl = ERR_PTR (-ENODATA); | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static int | |
501 | posix_acl_access_list (struct inode *inode, const char *name, int namelen, char *out) | |
502 | { | |
503 | int len = namelen; | |
504 | if (!reiserfs_posixacl (inode->i_sb)) | |
505 | return 0; | |
506 | if (out) | |
507 | memcpy (out, name, len); | |
508 | ||
509 | return len; | |
510 | } | |
511 | ||
512 | struct reiserfs_xattr_handler posix_acl_access_handler = { | |
9a59f452 | 513 | .prefix = POSIX_ACL_XATTR_ACCESS, |
1da177e4 LT |
514 | .get = posix_acl_access_get, |
515 | .set = posix_acl_access_set, | |
516 | .del = posix_acl_access_del, | |
517 | .list = posix_acl_access_list, | |
518 | }; | |
519 | ||
520 | static int | |
521 | posix_acl_default_get (struct inode *inode, const char *name, | |
522 | void *buffer, size_t size) | |
523 | { | |
9a59f452 | 524 | if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT)-1) |
1da177e4 LT |
525 | return -EINVAL; |
526 | return xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size); | |
527 | } | |
528 | ||
529 | static int | |
530 | posix_acl_default_set(struct inode *inode, const char *name, | |
531 | const void *value, size_t size, int flags) | |
532 | { | |
9a59f452 | 533 | if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT)-1) |
1da177e4 LT |
534 | return -EINVAL; |
535 | return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size); | |
536 | } | |
537 | ||
538 | static int | |
539 | posix_acl_default_del (struct inode *inode, const char *name) | |
540 | { | |
541 | struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode); | |
542 | struct posix_acl **acl = &reiserfs_i->i_acl_default; | |
9a59f452 | 543 | if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT)-1) |
1da177e4 LT |
544 | return -EINVAL; |
545 | if (!IS_ERR (*acl) && *acl) { | |
546 | posix_acl_release (*acl); | |
547 | *acl = ERR_PTR (-ENODATA); | |
548 | } | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | static int | |
554 | posix_acl_default_list (struct inode *inode, const char *name, int namelen, char *out) | |
555 | { | |
556 | int len = namelen; | |
557 | if (!reiserfs_posixacl (inode->i_sb)) | |
558 | return 0; | |
559 | if (out) | |
560 | memcpy (out, name, len); | |
561 | ||
562 | return len; | |
563 | } | |
564 | ||
565 | struct reiserfs_xattr_handler posix_acl_default_handler = { | |
9a59f452 | 566 | .prefix = POSIX_ACL_XATTR_DEFAULT, |
1da177e4 LT |
567 | .get = posix_acl_default_get, |
568 | .set = posix_acl_default_set, | |
569 | .del = posix_acl_default_del, | |
570 | .list = posix_acl_default_list, | |
571 | }; |