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 <[email protected]> 8 Copyright (C) 2002 SGI - Silicon Graphics, Inc <[email protected]> 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 17 static inline size_t 18 posix_acl_xattr_size(int count) 19 { 20 return (sizeof(struct posix_acl_xattr_header) + 21 (count * sizeof(struct posix_acl_xattr_entry))); 22 } 23 24 static inline int 25 posix_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 36 void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns, 37 void *value, size_t size); 38 void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns, 39 void *value, size_t size); 40 #else 41 static inline void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns, 42 void *value, size_t size) 43 { 44 } 45 static inline void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns, 46 void *value, size_t size) 47 { 48 } 49 #endif 50 51 struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 52 const void *value, size_t size); 53 int posix_acl_to_xattr(struct user_namespace *user_ns, 54 const struct posix_acl *acl, void *buffer, size_t size); 55 56 extern const struct xattr_handler posix_acl_access_xattr_handler; 57 extern const struct xattr_handler posix_acl_default_xattr_handler; 58 59 #endif /* _POSIX_ACL_XATTR_H */ 60