1 /*
2 File: fs/ext3/acl.h
3
4 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
5 */
6
7 #include <linux/posix_acl_xattr.h>
8
9 #define EXT3_ACL_VERSION 0x0001
10
11 typedef struct {
12 __le16 e_tag;
13 __le16 e_perm;
14 __le32 e_id;
15 } ext3_acl_entry;
16
17 typedef struct {
18 __le16 e_tag;
19 __le16 e_perm;
20 } ext3_acl_entry_short;
21
22 typedef struct {
23 __le32 a_version;
24 } ext3_acl_header;
25
26 static inline size_t ext3_acl_size(int count)
27 {
28 if (count <= 4) {
29 return sizeof(ext3_acl_header) +
30 count * sizeof(ext3_acl_entry_short);
31 } else {
32 return sizeof(ext3_acl_header) +
33 4 * sizeof(ext3_acl_entry_short) +
34 (count - 4) * sizeof(ext3_acl_entry);
35 }
36 }
37
38 static inline int ext3_acl_count(size_t size)
39 {
40 ssize_t s;
41 size -= sizeof(ext3_acl_header);
42 s = size - 4 * sizeof(ext3_acl_entry_short);
43 if (s < 0) {
44 if (size % sizeof(ext3_acl_entry_short))
45 return -1;
46 return size / sizeof(ext3_acl_entry_short);
47 } else {
48 if (s % sizeof(ext3_acl_entry))
49 return -1;
50 return s / sizeof(ext3_acl_entry) + 4;
51 }
52 }
53
54 #ifdef CONFIG_EXT3_FS_POSIX_ACL
55
56 /* Value for inode->u.ext3_i.i_acl and inode->u.ext3_i.i_default_acl
57 if the ACL has not been cached */
58 #define EXT3_ACL_NOT_CACHED ((void *)-1)
59
60 /* acl.c */
61 extern int ext3_permission (struct inode *, int, struct nameidata *);
62 extern int ext3_acl_chmod (struct inode *);
63 extern int ext3_init_acl (handle_t *, struct inode *, struct inode *);
64
65 extern int init_ext3_acl(void);
66 extern void exit_ext3_acl(void);
67
68 #else /* CONFIG_EXT3_FS_POSIX_ACL */
69 #include <linux/sched.h>
70 #define ext3_permission NULL
71
72 static inline int
73 ext3_acl_chmod(struct inode *inode)
74 {
75 return 0;
76 }
77
78 static inline int
79 ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
80 {
81 return 0;
82 }
83 #endif /* CONFIG_EXT3_FS_POSIX_ACL */
84
85
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