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 11 typedef struct { 12 __le16 e_tag; 13 __le16 e_perm; 14 __le32 e_id; 15 } ext4_acl_entry; 16 17 typedef struct { 18 __le16 e_tag; 19 __le16 e_perm; 20 } ext4_acl_entry_short; 21 22 typedef struct { 23 __le32 a_version; 24 } ext4_acl_header; 25 26 static 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 38 static 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_EXT4_FS_POSIX_ACL 55 56 /* acl.c */ 57 extern int ext4_permission(struct inode *, int); 58 extern int ext4_acl_chmod(struct inode *); 59 extern int ext4_init_acl(handle_t *, struct inode *, struct inode *); 60 61 #else /* CONFIG_EXT4_FS_POSIX_ACL */ 62 #include <linux/sched.h> 63 #define ext4_permission NULL 64 65 static inline int 66 ext4_acl_chmod(struct inode *inode) 67 { 68 return 0; 69 } 70 71 static inline int 72 ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) 73 { 74 return 0; 75 } 76 #endif /* CONFIG_EXT4_FS_POSIX_ACL */ 77 78