kernel-ark/fs/ext4/acl.h
Linus Torvalds 1d5ccd1c42 ext[234]: move over to 'check_acl' permission model
Don't implement per-filesystem 'extX_permission()' functions that have
to be called for every path component operation, and instead just expose
the actual ACL checking so that the VFS layer can now do it for us.

Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-08 11:09:04 -07:00

78 lines
1.5 KiB
C

/*
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_EXT4_FS_POSIX_ACL
/* acl.c */
extern int ext4_check_acl(struct inode *, int);
extern int ext4_acl_chmod(struct inode *);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
#else /* CONFIG_EXT4_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext4_check_acl 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_EXT4_FS_POSIX_ACL */