1/*
2  File: fs/ext4/acl.h
3
4  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
5*/
6
7#include <linux/posix_acl_xattr.h>
8
9#define EXT4_ACL_VERSION	0x0001
10
11typedef struct {
12	__le16		e_tag;
13	__le16		e_perm;
14	__le32		e_id;
15} ext4_acl_entry;
16
17typedef struct {
18	__le16		e_tag;
19	__le16		e_perm;
20} ext4_acl_entry_short;
21
22typedef struct {
23	__le32		a_version;
24} ext4_acl_header;
25
26static inline size_t ext4_acl_size(int count)
27{
28	if (count <= 4) {
29		return sizeof(ext4_acl_header) +
30		       count * sizeof(ext4_acl_entry_short);
31	} else {
32		return sizeof(ext4_acl_header) +
33		       4 * sizeof(ext4_acl_entry_short) +
34		       (count - 4) * sizeof(ext4_acl_entry);
35	}
36}
37
38static inline int ext4_acl_count(size_t size)
39{
40	ssize_t s;
41	size -= sizeof(ext4_acl_header);
42	s = size - 4 * sizeof(ext4_acl_entry_short);
43	if (s < 0) {
44		if (size % sizeof(ext4_acl_entry_short))
45			return -1;
46		return size / sizeof(ext4_acl_entry_short);
47	} else {
48		if (s % sizeof(ext4_acl_entry))
49			return -1;
50		return s / sizeof(ext4_acl_entry) + 4;
51	}
52}
53
54#ifdef CONFIG_EXT4_FS_POSIX_ACL
55
56/* acl.c */
57extern int ext4_check_acl(struct inode *, int);
58extern int ext4_acl_chmod(struct inode *);
59extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
60
61#else  /* CONFIG_EXT4_FS_POSIX_ACL */
62#include <linux/sched.h>
63#define ext4_check_acl NULL
64
65static inline int
66ext4_acl_chmod(struct inode *inode)
67{
68	return 0;
69}
70
71static inline int
72ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
73{
74	return 0;
75}
76#endif  /* CONFIG_EXT4_FS_POSIX_ACL */
77