1 #include <linux/capability.h>
3 #include <linux/posix_acl.h>
4 #include <linux/reiserfs_fs.h>
5 #include <linux/errno.h>
6 #include <linux/pagemap.h>
7 #include <linux/xattr.h>
8 #include <linux/posix_acl_xattr.h>
9 #include <linux/reiserfs_xattr.h>
10 #include <linux/reiserfs_acl.h>
11 #include <asm/uaccess.h>
13 static int reiserfs_set_acl(struct inode *inode, int type,
14 struct posix_acl *acl);
17 xattr_set_acl(struct inode *inode, int type, const void *value, size_t size)
19 struct posix_acl *acl;
22 if (!reiserfs_posixacl(inode->i_sb))
24 if (!is_owner_or_cap(inode))
28 acl = posix_acl_from_xattr(value, size);
32 error = posix_acl_valid(acl);
39 error = reiserfs_set_acl(inode, type, acl);
42 posix_acl_release(acl);
47 xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)
49 struct posix_acl *acl;
52 if (!reiserfs_posixacl(inode->i_sb))
55 acl = reiserfs_get_acl(inode, type);
60 error = posix_acl_to_xattr(acl, buffer, size);
61 posix_acl_release(acl);
67 * Convert from filesystem to in-memory representation.
69 static struct posix_acl *posix_acl_from_disk(const void *value, size_t size)
71 const char *end = (char *)value + size;
73 struct posix_acl *acl;
77 if (size < sizeof(reiserfs_acl_header))
78 return ERR_PTR(-EINVAL);
79 if (((reiserfs_acl_header *) value)->a_version !=
80 cpu_to_le32(REISERFS_ACL_VERSION))
81 return ERR_PTR(-EINVAL);
82 value = (char *)value + sizeof(reiserfs_acl_header);
83 count = reiserfs_acl_count(size);
85 return ERR_PTR(-EINVAL);
88 acl = posix_acl_alloc(count, GFP_NOFS);
90 return ERR_PTR(-ENOMEM);
91 for (n = 0; n < count; n++) {
92 reiserfs_acl_entry *entry = (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 = le32_to_cpu(entry->e_id);
124 posix_acl_release(acl);
125 return ERR_PTR(-EINVAL);
129 * Convert from in-memory to filesystem representation.
131 static void *posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
133 reiserfs_acl_header *ext_acl;
137 *size = reiserfs_acl_size(acl->a_count);
138 ext_acl = kmalloc(sizeof(reiserfs_acl_header) +
140 sizeof(reiserfs_acl_entry),
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) {
153 entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
154 e += sizeof(reiserfs_acl_entry);
161 e += sizeof(reiserfs_acl_entry_short);
168 return (char *)ext_acl;
172 return ERR_PTR(-EINVAL);
175 static inline void iset_acl(struct inode *inode, struct posix_acl **i_acl,
176 struct posix_acl *acl)
178 spin_lock(&inode->i_lock);
179 if (*i_acl != ERR_PTR(-ENODATA))
180 posix_acl_release(*i_acl);
181 *i_acl = posix_acl_dup(acl);
182 spin_unlock(&inode->i_lock);
185 static inline struct posix_acl *iget_acl(struct inode *inode,
186 struct posix_acl **i_acl)
188 struct posix_acl *acl = ERR_PTR(-ENODATA);
190 spin_lock(&inode->i_lock);
191 if (*i_acl != ERR_PTR(-ENODATA))
192 acl = posix_acl_dup(*i_acl);
193 spin_unlock(&inode->i_lock);
199 * Inode operation get_posix_acl().
201 * inode->i_mutex: down
202 * BKL held [before 2.5.x]
204 struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
207 struct posix_acl *acl, **p_acl;
210 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
213 case ACL_TYPE_ACCESS:
214 name = POSIX_ACL_XATTR_ACCESS;
215 p_acl = &reiserfs_i->i_acl_access;
217 case ACL_TYPE_DEFAULT:
218 name = POSIX_ACL_XATTR_DEFAULT;
219 p_acl = &reiserfs_i->i_acl_default;
222 return ERR_PTR(-EINVAL);
225 acl = iget_acl(inode, p_acl);
226 if (acl && !IS_ERR(acl))
228 else if (PTR_ERR(acl) == -ENODATA)
231 size = reiserfs_xattr_get(inode, name, NULL, 0);
233 if (size == -ENODATA || size == -ENOSYS) {
234 *p_acl = ERR_PTR(-ENODATA);
237 return ERR_PTR(size);
240 value = kmalloc(size, GFP_NOFS);
242 return ERR_PTR(-ENOMEM);
244 retval = reiserfs_xattr_get(inode, name, value, size);
245 if (retval == -ENODATA || retval == -ENOSYS) {
246 /* This shouldn't actually happen as it should have
247 been caught above.. but just in case */
249 *p_acl = ERR_PTR(-ENODATA);
250 } else if (retval < 0) {
251 acl = ERR_PTR(retval);
253 acl = posix_acl_from_disk(value, retval);
255 iset_acl(inode, p_acl, acl);
263 * Inode operation set_posix_acl().
265 * inode->i_mutex: down
266 * BKL held [before 2.5.x]
269 reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
273 struct posix_acl **p_acl;
276 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
278 if (S_ISLNK(inode->i_mode))
282 case ACL_TYPE_ACCESS:
283 name = POSIX_ACL_XATTR_ACCESS;
284 p_acl = &reiserfs_i->i_acl_access;
286 mode_t mode = inode->i_mode;
287 error = posix_acl_equiv_mode(acl, &mode);
291 inode->i_mode = mode;
297 case ACL_TYPE_DEFAULT:
298 name = POSIX_ACL_XATTR_DEFAULT;
299 p_acl = &reiserfs_i->i_acl_default;
300 if (!S_ISDIR(inode->i_mode))
301 return acl ? -EACCES : 0;
308 value = posix_acl_to_disk(acl, &size);
310 return (int)PTR_ERR(value);
311 error = reiserfs_xattr_set(inode, name, value, size, 0);
313 error = reiserfs_xattr_del(inode, name);
314 if (error == -ENODATA) {
315 /* This may seem odd here, but it means that the ACL was set
316 * with a value representable with mode bits. If there was
317 * an ACL before, reiserfs_xattr_del already dirtied the inode.
319 mark_inode_dirty(inode);
327 iset_acl(inode, p_acl, acl);
332 /* dir->i_mutex: locked,
333 * inode is new and not released into the wild yet */
335 reiserfs_inherit_default_acl(struct inode *dir, struct dentry *dentry,
338 struct posix_acl *acl;
341 /* ACLs only get applied to files and directories */
342 if (S_ISLNK(inode->i_mode))
345 /* ACLs can only be used on "new" objects, so if it's an old object
346 * there is nothing to inherit from */
347 if (get_inode_sd_version(dir) == STAT_DATA_V1)
350 /* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
351 * would be useless since permissions are ignored, and a pain because
352 * it introduces locking cycles */
353 if (IS_PRIVATE(dir)) {
354 inode->i_flags |= S_PRIVATE;
358 acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
360 if (PTR_ERR(acl) == -ENODATA)
366 struct posix_acl *acl_copy;
367 mode_t mode = inode->i_mode;
370 /* Copy the default ACL to the default ACL of a new directory */
371 if (S_ISDIR(inode->i_mode)) {
372 err = reiserfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
377 /* Now we reconcile the new ACL and the mode,
378 potentially modifying both */
379 acl_copy = posix_acl_clone(acl, GFP_NOFS);
385 need_acl = posix_acl_create_masq(acl_copy, &mode);
387 if (mode != inode->i_mode) {
388 inode->i_mode = mode;
391 /* If we need an ACL.. */
394 reiserfs_set_acl(inode, ACL_TYPE_ACCESS,
401 posix_acl_release(acl_copy);
403 posix_acl_release(acl);
406 /* no ACL, apply umask */
407 inode->i_mode &= ~current->fs->umask;
413 /* Looks up and caches the result of the default ACL.
414 * We do this so that we don't need to carry the xattr_sem into
415 * reiserfs_new_inode if we don't need to */
416 int reiserfs_cache_default_acl(struct inode *inode)
419 if (reiserfs_posixacl(inode->i_sb) && !IS_PRIVATE(inode)) {
420 struct posix_acl *acl;
421 reiserfs_read_lock_xattr_i(inode);
422 acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
423 reiserfs_read_unlock_xattr_i(inode);
424 ret = (acl && !IS_ERR(acl));
426 posix_acl_release(acl);
432 int reiserfs_acl_chmod(struct inode *inode)
434 struct posix_acl *acl, *clone;
437 if (S_ISLNK(inode->i_mode))
440 if (get_inode_sd_version(inode) == STAT_DATA_V1 ||
441 !reiserfs_posixacl(inode->i_sb)) {
445 acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
450 clone = posix_acl_clone(acl, GFP_NOFS);
451 posix_acl_release(acl);
454 error = posix_acl_chmod_masq(clone, inode->i_mode);
456 reiserfs_write_lock_xattr_i(inode);
457 error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
458 reiserfs_write_unlock_xattr_i(inode);
460 posix_acl_release(clone);
465 posix_acl_access_get(struct inode *inode, const char *name,
466 void *buffer, size_t size)
468 if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
470 return xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
474 posix_acl_access_set(struct inode *inode, const char *name,
475 const void *value, size_t size, int flags)
477 if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
479 return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
482 static int posix_acl_access_del(struct inode *inode, const char *name)
484 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
485 if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
487 iset_acl(inode, &reiserfs_i->i_acl_access, ERR_PTR(-ENODATA));
492 posix_acl_access_list(struct inode *inode, const char *name, int namelen,
496 if (!reiserfs_posixacl(inode->i_sb))
499 memcpy(out, name, len);
504 struct reiserfs_xattr_handler posix_acl_access_handler = {
505 .prefix = POSIX_ACL_XATTR_ACCESS,
506 .get = posix_acl_access_get,
507 .set = posix_acl_access_set,
508 .del = posix_acl_access_del,
509 .list = posix_acl_access_list,
513 posix_acl_default_get(struct inode *inode, const char *name,
514 void *buffer, size_t size)
516 if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
518 return xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
522 posix_acl_default_set(struct inode *inode, const char *name,
523 const void *value, size_t size, int flags)
525 if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
527 return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
530 static int posix_acl_default_del(struct inode *inode, const char *name)
532 struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
533 if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
535 iset_acl(inode, &reiserfs_i->i_acl_default, ERR_PTR(-ENODATA));
540 posix_acl_default_list(struct inode *inode, const char *name, int namelen,
544 if (!reiserfs_posixacl(inode->i_sb))
547 memcpy(out, name, len);
552 struct reiserfs_xattr_handler posix_acl_default_handler = {
553 .prefix = POSIX_ACL_XATTR_DEFAULT,
554 .get = posix_acl_default_get,
555 .set = posix_acl_default_set,
556 .del = posix_acl_default_del,
557 .list = posix_acl_default_list,