Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / fs / ext2 / acl.h
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
11 typedef struct {
12         __le16          e_tag;
13         __le16          e_perm;
14         __le32          e_id;
15 } ext2_acl_entry;
16
17 typedef struct {
18         __le16          e_tag;
19         __le16          e_perm;
20 } ext2_acl_entry_short;
21
22 typedef struct {
23         __le32          a_version;
24 } ext2_acl_header;
25
26 static 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
38 static 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 */
61 extern int ext2_permission (struct inode *, int);
62 extern int ext2_acl_chmod (struct inode *);
63 extern 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
71 static inline int
72 ext2_acl_chmod (struct inode *inode)
73 {
74         return 0;
75 }
76
77 static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
78 {
79         return 0;
80 }
81 #endif
82