1/*
2  File: fs/ext2/acl.h
3
4  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
5*/
6
7#include <linux/posix_acl_xattr.h>
8
9#define EXT2_ACL_VERSION	0x0001
10
11typedef struct {
12	__le16		e_tag;
13	__le16		e_perm;
14	__le32		e_id;
15} ext2_acl_entry;
16
17typedef struct {
18	__le16		e_tag;
19	__le16		e_perm;
20} ext2_acl_entry_short;
21
22typedef struct {
23	__le32		a_version;
24} ext2_acl_header;
25
26static inline size_t ext2_acl_size(int count)
27{
28	if (count <= 4) {
29		return sizeof(ext2_acl_header) +
30		       count * sizeof(ext2_acl_entry_short);
31	} else {
32		return sizeof(ext2_acl_header) +
33		       4 * sizeof(ext2_acl_entry_short) +
34		       (count - 4) * sizeof(ext2_acl_entry);
35	}
36}
37
38static inline int ext2_acl_count(size_t size)
39{
40	ssize_t s;
41	size -= sizeof(ext2_acl_header);
42	s = size - 4 * sizeof(ext2_acl_entry_short);
43	if (s < 0) {
44		if (size % sizeof(ext2_acl_entry_short))
45			return -1;
46		return size / sizeof(ext2_acl_entry_short);
47	} else {
48		if (s % sizeof(ext2_acl_entry))
49			return -1;
50		return s / sizeof(ext2_acl_entry) + 4;
51	}
52}
53
54#ifdef CONFIG_EXT2_FS_POSIX_ACL
55
56/* Value for inode->u.ext2_i.i_acl and inode->u.ext2_i.i_default_acl
57   if the ACL has not been cached */
58#define EXT2_ACL_NOT_CACHED ((void *)-1)
59
60/* acl.c */
61extern int ext2_permission (struct inode *, int, struct nameidata *);
62extern int ext2_acl_chmod (struct inode *);
63extern int ext2_init_acl (struct inode *, struct inode *);
64
65#else
66#include <linux/sched.h>
67#define ext2_permission NULL
68#define ext2_get_acl	NULL
69#define ext2_set_acl	NULL
70
71static inline int
72ext2_acl_chmod (struct inode *inode)
73{
74	return 0;
75}
76
77static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
78{
79	return 0;
80}
81#endif
82