posix_acl_xattr.h
上传用户:szlgq88
上传日期:2009-04-28
资源大小:48287k
文件大小:1k
- /*
- 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);
- }
- struct posix_acl *posix_acl_from_xattr(const void *value, size_t size);
- int posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size);
- #endif /* _POSIX_ACL_XATTR_H */