1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 File: linux/posix_acl_xattr.h 4 5 Extended attribute system call representation of Access Control Lists. 6 7 Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org> 8 Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com> 9 */ 10#ifndef _POSIX_ACL_XATTR_H 11#define _POSIX_ACL_XATTR_H 12 13#include <uapi/linux/xattr.h> 14#include <uapi/linux/posix_acl_xattr.h> 15#include <linux/posix_acl.h> 16 17static inline size_t 18posix_acl_xattr_size(int count) 19{ 20 return (sizeof(struct posix_acl_xattr_header) + 21 (count * sizeof(struct posix_acl_xattr_entry))); 22} 23 24static inline int 25posix_acl_xattr_count(size_t size) 26{ 27 if (size < sizeof(struct posix_acl_xattr_header)) 28 return -1; 29 size -= sizeof(struct posix_acl_xattr_header); 30 if (size % sizeof(struct posix_acl_xattr_entry)) 31 return -1; 32 return size / sizeof(struct posix_acl_xattr_entry); 33} 34 35#ifdef CONFIG_FS_POSIX_ACL 36void posix_acl_fix_xattr_from_user(void *value, size_t size); 37void posix_acl_fix_xattr_to_user(void *value, size_t size); 38#else 39static inline void posix_acl_fix_xattr_from_user(void *value, size_t size) 40{ 41} 42static inline void posix_acl_fix_xattr_to_user(void *value, size_t size) 43{ 44} 45#endif 46 47struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 48 const void *value, size_t size); 49int posix_acl_to_xattr(struct user_namespace *user_ns, 50 const struct posix_acl *acl, void *buffer, size_t size); 51 52extern const struct xattr_handler posix_acl_access_xattr_handler; 53extern const struct xattr_handler posix_acl_default_xattr_handler; 54 55#endif /* _POSIX_ACL_XATTR_H */ 56