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, struct nameidata *);
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
83
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