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>
7 #include <linux/xattr_acl.h>
8 #include <linux/reiserfs_xattr.h>
9 #include <linux/reiserfs_acl.h>
10 #include <asm/uaccess.h>
13 xattr_set_acl(struct inode *inode, int type, const void *value, size_t size)
15 struct posix_acl *acl;
18 if (!reiserfs_posixacl(inode->i_sb))
20 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
24 acl = posix_acl_from_xattr(value, size);
28 error = posix_acl_valid(acl);
35 error = reiserfs_set_acl (inode, type, acl);
38 posix_acl_release(acl);
44 xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)
46 struct posix_acl *acl;
49 if (!reiserfs_posixacl(inode->i_sb))
52 acl = reiserfs_get_acl (inode, type);
57 error = posix_acl_to_xattr(acl, buffer, size);
58 posix_acl_release(acl);
65 * Convert from filesystem to in-memory representation.
67 static struct posix_acl *
68 posix_acl_from_disk(const void *value, size_t size)
70 const char *end = (char *)value + size;
72 struct posix_acl *acl;
76 if (size < sizeof(reiserfs_acl_header))
77 return ERR_PTR(-EINVAL);
78 if (((reiserfs_acl_header *)value)->a_version !=
79 cpu_to_le32(REISERFS_ACL_VERSION))
80 return ERR_PTR(-EINVAL);
81 value = (char *)value + sizeof(reiserfs_acl_header);
82 count = reiserfs_acl_count(size);
84 return ERR_PTR(-EINVAL);
87 acl = posix_acl_alloc(count, GFP_NOFS);
89 return ERR_PTR(-ENOMEM);
90 for (n=0; n < count; n++) {
91 reiserfs_acl_entry *entry =
92 (reiserfs_acl_entry *)value;
93 if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
95 acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
96 acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
97 switch(acl->a_entries[n].e_tag) {
102 value = (char *)value +
103 sizeof(reiserfs_acl_entry_short);
104 acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
109 value = (char *)value + sizeof(reiserfs_acl_entry);
110 if ((char *)value > end)
112 acl->a_entries[n].e_id =
113 le32_to_cpu(entry->e_id);
125 posix_acl_release(acl);
126 return ERR_PTR(-EINVAL);
130 * Convert from in-memory to filesystem representation.
133 posix_acl_to_disk(const struct posix_acl *acl, size_t *size)
135 reiserfs_acl_header *ext_acl;
139 *size = reiserfs_acl_size(acl->a_count);
140 ext_acl = (reiserfs_acl_header *)kmalloc(sizeof(reiserfs_acl_header) +
141 acl->a_count * sizeof(reiserfs_acl_entry), GFP_NOFS);
143 return ERR_PTR(-ENOMEM);
144 ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
145 e = (char *)ext_acl + sizeof(reiserfs_acl_header);
146 for (n=0; n < acl->a_count; n++) {
147 reiserfs_acl_entry *entry = (reiserfs_acl_entry *)e;
148 entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
149 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
150 switch(acl->a_entries[n].e_tag) {
154 cpu_to_le32(acl->a_entries[n].e_id);
155 e += sizeof(reiserfs_acl_entry);
162 e += sizeof(reiserfs_acl_entry_short);
169 return (char *)ext_acl;
173 return ERR_PTR(-EINVAL);
177 * Inode operation get_posix_acl().
180 * BKL held [before 2.5.x]
183 reiserfs_get_acl(struct inode *inode, int type)
186 struct posix_acl *acl, **p_acl;
189 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
192 case ACL_TYPE_ACCESS:
193 name = XATTR_NAME_ACL_ACCESS;
194 p_acl = &reiserfs_i->i_acl_access;
196 case ACL_TYPE_DEFAULT:
197 name = XATTR_NAME_ACL_DEFAULT;
198 p_acl = &reiserfs_i->i_acl_default;
201 return ERR_PTR (-EINVAL);
204 if (IS_ERR (*p_acl)) {
205 if (PTR_ERR (*p_acl) == -ENODATA)
207 } else if (*p_acl != NULL)
208 return posix_acl_dup (*p_acl);
210 size = reiserfs_xattr_get (inode, name, NULL, 0);
212 if (size == -ENODATA || size == -ENOSYS) {
213 *p_acl = ERR_PTR (-ENODATA);
216 return ERR_PTR (size);
219 value = kmalloc (size, GFP_NOFS);
221 return ERR_PTR (-ENOMEM);
223 retval = reiserfs_xattr_get(inode, name, value, size);
224 if (retval == -ENODATA || retval == -ENOSYS) {
225 /* This shouldn't actually happen as it should have
226 been caught above.. but just in case */
228 *p_acl = ERR_PTR (-ENODATA);
229 } else if (retval < 0) {
230 acl = ERR_PTR(retval);
232 acl = posix_acl_from_disk(value, retval);
233 *p_acl = posix_acl_dup (acl);
241 * Inode operation set_posix_acl().
244 * BKL held [before 2.5.x]
247 reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
251 struct posix_acl **p_acl;
254 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
256 if (S_ISLNK(inode->i_mode))
260 case ACL_TYPE_ACCESS:
261 name = XATTR_NAME_ACL_ACCESS;
262 p_acl = &reiserfs_i->i_acl_access;
264 mode_t mode = inode->i_mode;
265 error = posix_acl_equiv_mode (acl, &mode);
269 inode->i_mode = mode;
275 case ACL_TYPE_DEFAULT:
276 name = XATTR_NAME_ACL_DEFAULT;
277 p_acl = &reiserfs_i->i_acl_default;
278 if (!S_ISDIR (inode->i_mode))
279 return acl ? -EACCES : 0;
286 value = posix_acl_to_disk(acl, &size);
288 return (int)PTR_ERR(value);
289 error = reiserfs_xattr_set(inode, name, value, size, 0);
291 error = reiserfs_xattr_del (inode, name);
292 if (error == -ENODATA) {
293 /* This may seem odd here, but it means that the ACL was set
294 * with a value representable with mode bits. If there was
295 * an ACL before, reiserfs_xattr_del already dirtied the inode.
297 mark_inode_dirty (inode);
306 /* Release the old one */
307 if (!IS_ERR (*p_acl) && *p_acl)
308 posix_acl_release (*p_acl);
311 *p_acl = ERR_PTR (-ENODATA);
313 *p_acl = posix_acl_dup (acl);
320 * inode is new and not released into the wild yet */
322 reiserfs_inherit_default_acl (struct inode *dir, struct dentry *dentry, struct inode *inode)
324 struct posix_acl *acl;
327 /* ACLs only get applied to files and directories */
328 if (S_ISLNK (inode->i_mode))
331 /* ACLs can only be used on "new" objects, so if it's an old object
332 * there is nothing to inherit from */
333 if (get_inode_sd_version (dir) == STAT_DATA_V1)
336 /* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
337 * would be useless since permissions are ignored, and a pain because
338 * it introduces locking cycles */
339 if (is_reiserfs_priv_object (dir)) {
340 REISERFS_I(inode)->i_flags |= i_priv_object;
344 acl = reiserfs_get_acl (dir, ACL_TYPE_DEFAULT);
346 if (PTR_ERR (acl) == -ENODATA)
348 return PTR_ERR (acl);
352 struct posix_acl *acl_copy;
353 mode_t mode = inode->i_mode;
356 /* Copy the default ACL to the default ACL of a new directory */
357 if (S_ISDIR (inode->i_mode)) {
358 err = reiserfs_set_acl (inode, ACL_TYPE_DEFAULT, acl);
363 /* Now we reconcile the new ACL and the mode,
364 potentially modifying both */
365 acl_copy = posix_acl_clone (acl, GFP_NOFS);
372 need_acl = posix_acl_create_masq (acl_copy, &mode);
374 if (mode != inode->i_mode) {
375 inode->i_mode = mode;
378 /* If we need an ACL.. */
380 err = reiserfs_set_acl (inode, ACL_TYPE_ACCESS, acl_copy);
386 posix_acl_release (acl_copy);
388 posix_acl_release (acl);
391 /* no ACL, apply umask */
392 inode->i_mode &= ~current->fs->umask;
398 /* Looks up and caches the result of the default ACL.
399 * We do this so that we don't need to carry the xattr_sem into
400 * reiserfs_new_inode if we don't need to */
402 reiserfs_cache_default_acl (struct inode *inode)
405 if (reiserfs_posixacl (inode->i_sb) &&
406 !is_reiserfs_priv_object (inode)) {
407 struct posix_acl *acl;
408 reiserfs_read_lock_xattr_i (inode);
409 reiserfs_read_lock_xattrs (inode->i_sb);
410 acl = reiserfs_get_acl (inode, ACL_TYPE_DEFAULT);
411 reiserfs_read_unlock_xattrs (inode->i_sb);
412 reiserfs_read_unlock_xattr_i (inode);
414 posix_acl_release (acl);
421 reiserfs_acl_chmod (struct inode *inode)
423 struct posix_acl *acl, *clone;
426 if (S_ISLNK(inode->i_mode))
429 if (get_inode_sd_version (inode) == STAT_DATA_V1 ||
430 !reiserfs_posixacl(inode->i_sb))
435 reiserfs_read_lock_xattrs (inode->i_sb);
436 acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
437 reiserfs_read_unlock_xattrs (inode->i_sb);
442 clone = posix_acl_clone(acl, GFP_NOFS);
443 posix_acl_release(acl);
446 error = posix_acl_chmod_masq(clone, inode->i_mode);
448 int lock = !has_xattr_dir (inode);
449 reiserfs_write_lock_xattr_i (inode);
451 reiserfs_write_lock_xattrs (inode->i_sb);
453 reiserfs_read_lock_xattrs (inode->i_sb);
454 error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
456 reiserfs_write_unlock_xattrs (inode->i_sb);
458 reiserfs_read_unlock_xattrs (inode->i_sb);
459 reiserfs_write_unlock_xattr_i (inode);
461 posix_acl_release(clone);
466 posix_acl_access_get(struct inode *inode, const char *name,
467 void *buffer, size_t size)
469 if (strlen(name) != sizeof(XATTR_NAME_ACL_ACCESS)-1)
471 return xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
475 posix_acl_access_set(struct inode *inode, const char *name,
476 const void *value, size_t size, int flags)
478 if (strlen(name) != sizeof(XATTR_NAME_ACL_ACCESS)-1)
480 return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
484 posix_acl_access_del (struct inode *inode, const char *name)
486 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
487 struct posix_acl **acl = &reiserfs_i->i_acl_access;
488 if (strlen(name) != sizeof(XATTR_NAME_ACL_ACCESS)-1)
490 if (!IS_ERR (*acl) && *acl) {
491 posix_acl_release (*acl);
492 *acl = ERR_PTR (-ENODATA);
499 posix_acl_access_list (struct inode *inode, const char *name, int namelen, char *out)
502 if (!reiserfs_posixacl (inode->i_sb))
505 memcpy (out, name, len);
510 struct reiserfs_xattr_handler posix_acl_access_handler = {
511 .prefix = XATTR_NAME_ACL_ACCESS,
512 .get = posix_acl_access_get,
513 .set = posix_acl_access_set,
514 .del = posix_acl_access_del,
515 .list = posix_acl_access_list,
519 posix_acl_default_get (struct inode *inode, const char *name,
520 void *buffer, size_t size)
522 if (strlen(name) != sizeof(XATTR_NAME_ACL_DEFAULT)-1)
524 return xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
528 posix_acl_default_set(struct inode *inode, const char *name,
529 const void *value, size_t size, int flags)
531 if (strlen(name) != sizeof(XATTR_NAME_ACL_DEFAULT)-1)
533 return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
537 posix_acl_default_del (struct inode *inode, const char *name)
539 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
540 struct posix_acl **acl = &reiserfs_i->i_acl_default;
541 if (strlen(name) != sizeof(XATTR_NAME_ACL_DEFAULT)-1)
543 if (!IS_ERR (*acl) && *acl) {
544 posix_acl_release (*acl);
545 *acl = ERR_PTR (-ENODATA);
552 posix_acl_default_list (struct inode *inode, const char *name, int namelen, char *out)
555 if (!reiserfs_posixacl (inode->i_sb))
558 memcpy (out, name, len);
563 struct reiserfs_xattr_handler posix_acl_default_handler = {
564 .prefix = XATTR_NAME_ACL_DEFAULT,
565 .get = posix_acl_default_get,
566 .set = posix_acl_default_set,
567 .del = posix_acl_default_del,
568 .list = posix_acl_default_list,