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/fs/ext2/acl.h

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C Header | 77 lines | 58 code | 13 blank | 6 comment | 6 complexity | 3f72992661a7c0fdf100d5ba3d2f38bb MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
 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/* acl.c */
57extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
58extern int ext2_acl_chmod (struct inode *);
59extern int ext2_init_acl (struct inode *, struct inode *);
60
61#else
62#include <linux/sched.h>
63#define ext2_get_acl	NULL
64#define ext2_set_acl	NULL
65
66static inline int
67ext2_acl_chmod (struct inode *inode)
68{
69	return 0;
70}
71
72static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
73{
74	return 0;
75}
76#endif
77