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Commit | Line | Data |
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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 |