1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3  File: fs/ext2/acl.h
4
5  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
6*/
7
8#include <linux/posix_acl_xattr.h>
9
10#define EXT2_ACL_VERSION	0x0001
11
12typedef struct {
13	__le16		e_tag;
14	__le16		e_perm;
15	__le32		e_id;
16} ext2_acl_entry;
17
18typedef struct {
19	__le16		e_tag;
20	__le16		e_perm;
21} ext2_acl_entry_short;
22
23typedef struct {
24	__le32		a_version;
25} ext2_acl_header;
26
27static inline size_t ext2_acl_size(int count)
28{
29	if (count <= 4) {
30		return sizeof(ext2_acl_header) +
31		       count * sizeof(ext2_acl_entry_short);
32	} else {
33		return sizeof(ext2_acl_header) +
34		       4 * sizeof(ext2_acl_entry_short) +
35		       (count - 4) * sizeof(ext2_acl_entry);
36	}
37}
38
39static inline int ext2_acl_count(size_t size)
40{
41	ssize_t s;
42	size -= sizeof(ext2_acl_header);
43	s = size - 4 * sizeof(ext2_acl_entry_short);
44	if (s < 0) {
45		if (size % sizeof(ext2_acl_entry_short))
46			return -1;
47		return size / sizeof(ext2_acl_entry_short);
48	} else {
49		if (s % sizeof(ext2_acl_entry))
50			return -1;
51		return s / sizeof(ext2_acl_entry) + 4;
52	}
53}
54
55#ifdef CONFIG_EXT2_FS_POSIX_ACL
56
57/* acl.c */
58extern struct posix_acl *ext2_get_acl(struct inode *inode, int type, bool rcu);
59extern int ext2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
60			struct posix_acl *acl, int type);
61extern int ext2_init_acl (struct inode *, struct inode *);
62
63#else
64#include <linux/sched.h>
65#define ext2_get_acl	NULL
66#define ext2_set_acl	NULL
67
68static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
69{
70	return 0;
71}
72#endif
73
74