acl.c (37bc15392a2363ca822b2c2828e0ccafbea32f75) acl.c (64e178a7118b1cf7648391755e44dcc209091003)
1/*
2 * linux/fs/ext4/acl.c
3 *
4 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
5 */
6
7#include <linux/init.h>
8#include <linux/sched.h>

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147struct posix_acl *
148ext4_get_acl(struct inode *inode, int type)
149{
150 int name_index;
151 char *value = NULL;
152 struct posix_acl *acl;
153 int retval;
154
1/*
2 * linux/fs/ext4/acl.c
3 *
4 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
5 */
6
7#include <linux/init.h>
8#include <linux/sched.h>

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147struct posix_acl *
148ext4_get_acl(struct inode *inode, int type)
149{
150 int name_index;
151 char *value = NULL;
152 struct posix_acl *acl;
153 int retval;
154
155 if (!test_opt(inode->i_sb, POSIX_ACL))
156 return NULL;
157
158 acl = get_cached_acl(inode, type);
159 if (acl != ACL_NOT_CACHED)
160 return acl;
161
162 switch (type) {
163 case ACL_TYPE_ACCESS:
164 name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
165 break;
166 case ACL_TYPE_DEFAULT:
167 name_index = EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT;
168 break;
169 default:

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191}
192
193/*
194 * Set the access or default ACL of an inode.
195 *
196 * inode->i_mutex: down unless called from ext4_new_inode
197 */
198static int
155 switch (type) {
156 case ACL_TYPE_ACCESS:
157 name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
158 break;
159 case ACL_TYPE_DEFAULT:
160 name_index = EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT;
161 break;
162 default:

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184}
185
186/*
187 * Set the access or default ACL of an inode.
188 *
189 * inode->i_mutex: down unless called from ext4_new_inode
190 */
191static int
199ext4_set_acl(handle_t *handle, struct inode *inode, int type,
192__ext4_set_acl(handle_t *handle, struct inode *inode, int type,
200 struct posix_acl *acl)
201{
202 int name_index;
203 void *value = NULL;
204 size_t size = 0;
205 int error;
206
193 struct posix_acl *acl)
194{
195 int name_index;
196 void *value = NULL;
197 size_t size = 0;
198 int error;
199
207 if (S_ISLNK(inode->i_mode))
208 return -EOPNOTSUPP;
209
210 switch (type) {
211 case ACL_TYPE_ACCESS:
212 name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
213 if (acl) {
214 error = posix_acl_equiv_mode(acl, &inode->i_mode);
215 if (error < 0)
216 return error;
217 else {

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243
244 kfree(value);
245 if (!error)
246 set_cached_acl(inode, type, acl);
247
248 return error;
249}
250
200 switch (type) {
201 case ACL_TYPE_ACCESS:
202 name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
203 if (acl) {
204 error = posix_acl_equiv_mode(acl, &inode->i_mode);
205 if (error < 0)
206 return error;
207 else {

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233
234 kfree(value);
235 if (!error)
236 set_cached_acl(inode, type, acl);
237
238 return error;
239}
240
251/*
252 * Initialize the ACLs of a new inode. Called from ext4_new_inode.
253 *
254 * dir->i_mutex: down
255 * inode->i_mutex: up (access to inode is still exclusive)
256 */
257int
241int
258ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
242ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type)
259{
243{
260 struct posix_acl *acl = NULL;
261 int error = 0;
262
263 if (!S_ISLNK(inode->i_mode)) {
264 if (test_opt(dir->i_sb, POSIX_ACL)) {
265 acl = ext4_get_acl(dir, ACL_TYPE_DEFAULT);
266 if (IS_ERR(acl))
267 return PTR_ERR(acl);
268 }
269 if (!acl)
270 inode->i_mode &= ~current_umask();
271 }
272 if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
273 if (S_ISDIR(inode->i_mode)) {
274 error = ext4_set_acl(handle, inode,
275 ACL_TYPE_DEFAULT, acl);
276 if (error)
277 goto cleanup;
278 }
279 error = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
280 if (error < 0)
281 return error;
282
283 if (error > 0) {
284 /* This is an extended ACL */
285 error = ext4_set_acl(handle, inode, ACL_TYPE_ACCESS, acl);
286 }
287 }
288cleanup:
289 posix_acl_release(acl);
290 return error;
291}
292
293/*
294 * Does chmod for an inode that may have an Access Control List. The
295 * inode->i_mode field must be updated to the desired value by the caller
296 * before calling this function.
297 * Returns 0 on success, or a negative error number.
298 *
299 * We change the ACL rather than storing some ACL entries in the file
300 * mode permission bits (which would be more efficient), because that
301 * would break once additional permissions (like ACL_APPEND, ACL_DELETE
302 * for directories) are added. There are no more bits available in the
303 * file mode.
304 *
305 * inode->i_mutex: down
306 */
307int
308ext4_acl_chmod(struct inode *inode)
309{
310 struct posix_acl *acl;
311 handle_t *handle;
244 handle_t *handle;
312 int retries = 0;
313 int error;
245 int error, retries = 0;
314
246
315
316 if (S_ISLNK(inode->i_mode))
317 return -EOPNOTSUPP;
318 if (!test_opt(inode->i_sb, POSIX_ACL))
319 return 0;
320 acl = ext4_get_acl(inode, ACL_TYPE_ACCESS);
321 if (IS_ERR(acl) || !acl)
322 return PTR_ERR(acl);
323 error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
324 if (error)
325 return error;
326retry:
327 handle = ext4_journal_start(inode, EXT4_HT_XATTR,
328 ext4_jbd2_credits_xattr(inode));
247retry:
248 handle = ext4_journal_start(inode, EXT4_HT_XATTR,
249 ext4_jbd2_credits_xattr(inode));
329 if (IS_ERR(handle)) {
330 error = PTR_ERR(handle);
331 ext4_std_error(inode->i_sb, error);
332 goto out;
333 }
334 error = ext4_set_acl(handle, inode, ACL_TYPE_ACCESS, acl);
250 if (IS_ERR(handle))
251 return PTR_ERR(handle);
252
253 error = __ext4_set_acl(handle, inode, type, acl);
335 ext4_journal_stop(handle);
254 ext4_journal_stop(handle);
336 if (error == -ENOSPC &&
337 ext4_should_retry_alloc(inode->i_sb, &retries))
255 if (error == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
338 goto retry;
256 goto retry;
339out:
340 posix_acl_release(acl);
341 return error;
342}
343
344/*
257 return error;
258}
259
260/*
345 * Extended attribute handlers
261 * Initialize the ACLs of a new inode. Called from ext4_new_inode.
262 *
263 * dir->i_mutex: down
264 * inode->i_mutex: up (access to inode is still exclusive)
346 */
265 */
347static size_t
348ext4_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_len,
349 const char *name, size_t name_len, int type)
266int
267ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
350{
268{
351 const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
352
353 if (!test_opt(dentry->d_sb, POSIX_ACL))
354 return 0;
355 if (list && size <= list_len)
356 memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
357 return size;
358}
359
360static size_t
361ext4_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_len,
362 const char *name, size_t name_len, int type)
363{
364 const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
365
366 if (!test_opt(dentry->d_sb, POSIX_ACL))
367 return 0;
368 if (list && size <= list_len)
369 memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
370 return size;
371}
372
373static int
374ext4_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
375 size_t size, int type)
376{
377 struct posix_acl *acl;
269 struct posix_acl *default_acl, *acl;
378 int error;
379
270 int error;
271
380 if (strcmp(name, "") != 0)
381 return -EINVAL;
382 if (!test_opt(dentry->d_sb, POSIX_ACL))
383 return -EOPNOTSUPP;
272 error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
273 if (error)
274 return error;
384
275
385 acl = ext4_get_acl(dentry->d_inode, type);
386 if (IS_ERR(acl))
387 return PTR_ERR(acl);
388 if (acl == NULL)
389 return -ENODATA;
390 error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
391 posix_acl_release(acl);
392
393 return error;
394}
395
396static int
397ext4_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
398 size_t size, int flags, int type)
399{
400 struct inode *inode = dentry->d_inode;
401 handle_t *handle;
402 struct posix_acl *acl;
403 int error, retries = 0;
404
405 if (strcmp(name, "") != 0)
406 return -EINVAL;
407 if (!test_opt(inode->i_sb, POSIX_ACL))
408 return -EOPNOTSUPP;
409 if (!inode_owner_or_capable(inode))
410 return -EPERM;
411
412 if (value) {
413 acl = posix_acl_from_xattr(&init_user_ns, value, size);
414 if (IS_ERR(acl))
415 return PTR_ERR(acl);
416 else if (acl) {
417 error = posix_acl_valid(acl);
418 if (error)
419 goto release_and_out;
420 }
421 } else
422 acl = NULL;
423
424retry:
425 handle = ext4_journal_start(inode, EXT4_HT_XATTR,
426 ext4_jbd2_credits_xattr(inode));
427 if (IS_ERR(handle)) {
428 error = PTR_ERR(handle);
429 goto release_and_out;
276 if (default_acl) {
277 error = __ext4_set_acl(handle, inode, ACL_TYPE_DEFAULT,
278 default_acl);
279 posix_acl_release(default_acl);
430 }
280 }
431 error = ext4_set_acl(handle, inode, type, acl);
432 ext4_journal_stop(handle);
433 if (error == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
434 goto retry;
435
436release_and_out:
437 posix_acl_release(acl);
281 if (acl) {
282 if (!error)
283 error = __ext4_set_acl(handle, inode, ACL_TYPE_ACCESS,
284 acl);
285 posix_acl_release(acl);
286 }
438 return error;
439}
287 return error;
288}
440
441const struct xattr_handler ext4_xattr_acl_access_handler = {
442 .prefix = POSIX_ACL_XATTR_ACCESS,
443 .flags = ACL_TYPE_ACCESS,
444 .list = ext4_xattr_list_acl_access,
445 .get = ext4_xattr_get_acl,
446 .set = ext4_xattr_set_acl,
447};
448
449const struct xattr_handler ext4_xattr_acl_default_handler = {
450 .prefix = POSIX_ACL_XATTR_DEFAULT,
451 .flags = ACL_TYPE_DEFAULT,
452 .list = ext4_xattr_list_acl_default,
453 .get = ext4_xattr_get_acl,
454 .set = ext4_xattr_set_acl,
455};