1/* 2 File: fs/ext4/acl.h 3 4 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 5*/ 6 7#include <linux/posix_acl_xattr.h> 8 9#define EXT4_ACL_VERSION 0x0001 10 11typedef struct { 12 __le16 e_tag; 13 __le16 e_perm; 14 __le32 e_id; 15} ext4_acl_entry; 16 17typedef struct { 18 __le16 e_tag; 19 __le16 e_perm; 20} ext4_acl_entry_short; 21 22typedef struct { 23 __le32 a_version; 24} ext4_acl_header; 25 26static inline size_t ext4_acl_size(int count) 27{ 28 if (count <= 4) { 29 return sizeof(ext4_acl_header) + 30 count * sizeof(ext4_acl_entry_short); 31 } else { 32 return sizeof(ext4_acl_header) + 33 4 * sizeof(ext4_acl_entry_short) + 34 (count - 4) * sizeof(ext4_acl_entry); 35 } 36} 37 38static inline int ext4_acl_count(size_t size) 39{ 40 ssize_t s; 41 size -= sizeof(ext4_acl_header); 42 s = size - 4 * sizeof(ext4_acl_entry_short); 43 if (s < 0) { 44 if (size % sizeof(ext4_acl_entry_short)) 45 return -1; 46 return size / sizeof(ext4_acl_entry_short); 47 } else { 48 if (s % sizeof(ext4_acl_entry)) 49 return -1; 50 return s / sizeof(ext4_acl_entry) + 4; 51 } 52} 53 54#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 55 56/* Value for inode->u.ext4_i.i_acl and inode->u.ext4_i.i_default_acl 57 if the ACL has not been cached */ 58#define EXT4_ACL_NOT_CACHED ((void *)-1) 59 60/* acl.c */ 61extern int ext4_permission (struct inode *, int, struct nameidata *); 62extern int ext4_acl_chmod (struct inode *); 63extern int ext4_init_acl (handle_t *, struct inode *, struct inode *); 64 65#else /* CONFIG_EXT4DEV_FS_POSIX_ACL */ 66#include <linux/sched.h> 67#define ext4_permission NULL 68 69static inline int 70ext4_acl_chmod(struct inode *inode) 71{ 72 return 0; 73} 74 75static inline int 76ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) 77{ 78 return 0; 79} 80#endif /* CONFIG_EXT4DEV_FS_POSIX_ACL */ 81