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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 | |
11 | typedef struct { |
12 | __le16 e_tag; |
13 | __le16 e_perm; |
14 | __le32 e_id; |
15 | } ext4_acl_entry; |
16 | |
17 | typedef struct { |
18 | __le16 e_tag; |
19 | __le16 e_perm; |
20 | } ext4_acl_entry_short; |
21 | |
22 | typedef struct { |
23 | __le32 a_version; |
24 | } ext4_acl_header; |
25 | |
26 | static 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 | |
38 | static 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 */ |
57 | extern int ext4_permission(struct inode *, int); |
58 | extern int ext4_acl_chmod(struct inode *); |
59 | extern 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 | |
65 | static inline int |
66 | ext4_acl_chmod(struct inode *inode) |
67 | { |
68 | return 0; |
69 | } |
70 | |
71 | static inline int |
72 | ext4_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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