forked from luck/tmp_suning_uos_patched
2aeccbe957
With the ->set_acl inode operation we can implement the Posix ACL xattr handlers in generic code instead of duplicating them all over the tree. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
|
|
File: linux/posix_acl_xattr.h
|
|
|
|
Extended attribute system call representation of Access Control Lists.
|
|
|
|
Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
|
|
Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
|
|
*/
|
|
#ifndef _POSIX_ACL_XATTR_H
|
|
#define _POSIX_ACL_XATTR_H
|
|
|
|
#include <linux/posix_acl.h>
|
|
|
|
/* Extended attribute names */
|
|
#define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access"
|
|
#define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default"
|
|
|
|
/* Supported ACL a_version fields */
|
|
#define POSIX_ACL_XATTR_VERSION 0x0002
|
|
|
|
|
|
/* An undefined entry e_id value */
|
|
#define ACL_UNDEFINED_ID (-1)
|
|
|
|
typedef struct {
|
|
__le16 e_tag;
|
|
__le16 e_perm;
|
|
__le32 e_id;
|
|
} posix_acl_xattr_entry;
|
|
|
|
typedef struct {
|
|
__le32 a_version;
|
|
posix_acl_xattr_entry a_entries[0];
|
|
} posix_acl_xattr_header;
|
|
|
|
|
|
static inline size_t
|
|
posix_acl_xattr_size(int count)
|
|
{
|
|
return (sizeof(posix_acl_xattr_header) +
|
|
(count * sizeof(posix_acl_xattr_entry)));
|
|
}
|
|
|
|
static inline int
|
|
posix_acl_xattr_count(size_t size)
|
|
{
|
|
if (size < sizeof(posix_acl_xattr_header))
|
|
return -1;
|
|
size -= sizeof(posix_acl_xattr_header);
|
|
if (size % sizeof(posix_acl_xattr_entry))
|
|
return -1;
|
|
return size / sizeof(posix_acl_xattr_entry);
|
|
}
|
|
|
|
#ifdef CONFIG_FS_POSIX_ACL
|
|
void posix_acl_fix_xattr_from_user(void *value, size_t size);
|
|
void posix_acl_fix_xattr_to_user(void *value, size_t size);
|
|
#else
|
|
static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
|
|
{
|
|
}
|
|
static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns,
|
|
const void *value, size_t size);
|
|
int posix_acl_to_xattr(struct user_namespace *user_ns,
|
|
const struct posix_acl *acl, void *buffer, size_t size);
|
|
|
|
extern const struct xattr_handler posix_acl_access_xattr_handler;
|
|
extern const struct xattr_handler posix_acl_default_xattr_handler;
|
|
|
|
#endif /* _POSIX_ACL_XATTR_H */
|