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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 File: fs/ext2/acl.h
3
4 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
5*/
6
Christoph Hellwig9a59f452005-06-23 00:10:19 -07007#include <linux/posix_acl_xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
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 */
Al Viroe6305c42008-07-15 21:03:57 -040061extern int ext2_permission (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062extern 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