x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / fs / ext4 / acl.h
blob9d843d5deac402593b8b557e27c6ed25aafe401d
1 /*
2 File: fs/ext4/acl.h
4 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
5 */
7 #include <linux/posix_acl_xattr.h>
9 #define EXT4_ACL_VERSION 0x0001
11 typedef struct {
12 __le16 e_tag;
13 __le16 e_perm;
14 __le32 e_id;
15 } ext4_acl_entry;
17 typedef struct {
18 __le16 e_tag;
19 __le16 e_perm;
20 } ext4_acl_entry_short;
22 typedef struct {
23 __le32 a_version;
24 } ext4_acl_header;
26 static inline size_t ext4_acl_size(int count)
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);
38 static inline int ext4_acl_count(size_t size)
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;
54 #ifdef CONFIG_EXT4_FS_POSIX_ACL
56 /* acl.c */
57 extern int ext4_check_acl(struct inode *, int);
58 extern int ext4_acl_chmod(struct inode *);
59 extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
61 #else /* CONFIG_EXT4_FS_POSIX_ACL */
62 #include <linux/sched.h>
63 #define ext4_check_acl NULL
65 static inline int
66 ext4_acl_chmod(struct inode *inode)
68 return 0;
71 static inline int
72 ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
74 return 0;
76 #endif /* CONFIG_EXT4_FS_POSIX_ACL */