Root/fs/ext4/acl.h

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_permission(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_permission 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
78

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