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/*
File: fs/ext4/acl.h
(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
#include <linux/posix_acl_xattr.h>
#define EXT4_ACL_VERSION 0x0001
typedef struct {
__le16 e_tag;
__le16 e_perm;
__le32 e_id;
} ext4_acl_entry;
typedef struct {
__le16 e_tag;
__le16 e_perm;
} ext4_acl_entry_short;
typedef struct {
__le32 a_version;
} ext4_acl_header;
static inline size_t ext4_acl_size(int count)
{
if (count <= 4) {
return sizeof(ext4_acl_header) +
count * sizeof(ext4_acl_entry_short);
} else {
return sizeof(ext4_acl_header) +
4 * sizeof(ext4_acl_entry_short) +
(count - 4) * sizeof(ext4_acl_entry);
}
}
static inline int ext4_acl_count(size_t size)
{
ssize_t s;
size -= sizeof(ext4_acl_header);
s = size - 4 * sizeof(ext4_acl_entry_short);
if (s < 0) {
if (size % sizeof(ext4_acl_entry_short))
return -1;
return size / sizeof(ext4_acl_entry_short);
} else {
if (s % sizeof(ext4_acl_entry))
return -1;
return s / sizeof(ext4_acl_entry) + 4;
}
}
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
/* Value for inode->u.ext4_i.i_acl and inode->u.ext4_i.i_default_acl
if the ACL has not been cached */
#define EXT4_ACL_NOT_CACHED ((void *)-1)
/* acl.c */
extern int ext4_permission(struct inode *, int);
extern int ext4_acl_chmod(struct inode *);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
#else /* CONFIG_EXT4DEV_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext4_permission NULL
static inline int
ext4_acl_chmod(struct inode *inode)
{
return 0;
}
static inline int
ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
return 0;
}
#endif /* CONFIG_EXT4DEV_FS_POSIX_ACL */
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