1/* 2 File: fs/ext2/acl.h 3 4 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 5*/ 6 7#include <linux/posix_acl_xattr.h> 8 9#define EXT2_ACL_VERSION 0x0001 10 11typedef struct { 12 __le16 e_tag; 13 __le16 e_perm; 14 __le32 e_id; 15} ext2_acl_entry; 16 17typedef struct { 18 __le16 e_tag; 19 __le16 e_perm; 20} ext2_acl_entry_short; 21 22typedef struct { 23 __le32 a_version; 24} ext2_acl_header; 25 26static inline size_t ext2_acl_size(int count) 27{ 28 if (count <= 4) { 29 return sizeof(ext2_acl_header) + 30 count * sizeof(ext2_acl_entry_short); 31 } else { 32 return sizeof(ext2_acl_header) + 33 4 * sizeof(ext2_acl_entry_short) + 34 (count - 4) * sizeof(ext2_acl_entry); 35 } 36} 37 38static inline int ext2_acl_count(size_t size) 39{ 40 ssize_t s; 41 size -= sizeof(ext2_acl_header); 42 s = size - 4 * sizeof(ext2_acl_entry_short); 43 if (s < 0) { 44 if (size % sizeof(ext2_acl_entry_short)) 45 return -1; 46 return size / sizeof(ext2_acl_entry_short); 47 } else { 48 if (s % sizeof(ext2_acl_entry)) 49 return -1; 50 return s / sizeof(ext2_acl_entry) + 4; 51 } 52} 53 54#ifdef CONFIG_EXT2_FS_POSIX_ACL 55 56/* acl.c */ 57extern struct posix_acl *ext2_get_acl(struct inode *inode, int type); 58extern int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type); 59extern int ext2_init_acl (struct inode *, struct inode *); 60 61#else 62#include <linux/sched.h> 63#define ext2_get_acl NULL 64#define ext2_set_acl NULL 65 66static inline int ext2_init_acl (struct inode *inode, struct inode *dir) 67{ 68 return 0; 69} 70#endif 71 72