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 11 typedef struct { 12 __le16 e_tag; 13 __le16 e_perm; 14 __le32 e_id; 15 } ext2_acl_entry; 16 17 typedef struct { 18 __le16 e_tag; 19 __le16 e_perm; 20 } ext2_acl_entry_short; 21 22 typedef struct { 23 __le32 a_version; 24 } ext2_acl_header; 25 26 static 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 38 static 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 /* Value for inode->u.ext2_i.i_acl and inode->u.ext2_i.i_default_acl 57 if the ACL has not been cached */ 58 #define EXT2_ACL_NOT_CACHED ((void *)-1) 59 60 /* acl.c */ 61 extern int ext2_permission (struct inode *, int, struct nameidata *); 62 extern int ext2_acl_chmod (struct inode *); 63 extern int ext2_init_acl (struct inode *, struct inode *); 64 65 #else 66 #include <linux/sched.h> 67 #define ext2_permission NULL 68 #define ext2_get_acl NULL 69 #define ext2_set_acl NULL 70 71 static inline int 72 ext2_acl_chmod (struct inode *inode) 73 { 74 return 0; 75 } 76 77 static inline int ext2_init_acl (struct inode *inode, struct inode *dir) 78 { 79 return 0; 80 } 81 #endif 82 83