1 /* 2 File: fs/ext3/acl.h 3 4 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 5 */ 6 7 #include <linux/posix_acl_xattr.h> 8 9 #define EXT3_ACL_VERSION 0x0001 10 11 typedef struct { 12 __le16 e_tag; 13 __le16 e_perm; 14 __le32 e_id; 15 } ext3_acl_entry; 16 17 typedef struct { 18 __le16 e_tag; 19 __le16 e_perm; 20 } ext3_acl_entry_short; 21 22 typedef struct { 23 __le32 a_version; 24 } ext3_acl_header; 25 26 static inline size_t ext3_acl_size(int count) 27 { 28 if (count <= 4) { 29 return sizeof(ext3_acl_header) + 30 count * sizeof(ext3_acl_entry_short); 31 } else { 32 return sizeof(ext3_acl_header) + 33 4 * sizeof(ext3_acl_entry_short) + 34 (count - 4) * sizeof(ext3_acl_entry); 35 } 36 } 37 38 static inline int ext3_acl_count(size_t size) 39 { 40 ssize_t s; 41 size -= sizeof(ext3_acl_header); 42 s = size - 4 * sizeof(ext3_acl_entry_short); 43 if (s < 0) { 44 if (size % sizeof(ext3_acl_entry_short)) 45 return -1; 46 return size / sizeof(ext3_acl_entry_short); 47 } else { 48 if (s % sizeof(ext3_acl_entry)) 49 return -1; 50 return s / sizeof(ext3_acl_entry) + 4; 51 } 52 } 53 54 #ifdef CONFIG_EXT3_FS_POSIX_ACL 55 56 /* Value for inode->u.ext3_i.i_acl and inode->u.ext3_i.i_default_acl 57 if the ACL has not been cached */ 58 #define EXT3_ACL_NOT_CACHED ((void *)-1) 59 60 /* acl.c */ 61 extern int ext3_permission (struct inode *, int, struct nameidata *); 62 extern int ext3_acl_chmod (struct inode *); 63 extern int ext3_init_acl (handle_t *, struct inode *, struct inode *); 64 65 #else /* CONFIG_EXT3_FS_POSIX_ACL */ 66 #include <linux/sched.h> 67 #define ext3_permission NULL 68 69 static inline int 70 ext3_acl_chmod(struct inode *inode) 71 { 72 return 0; 73 } 74 75 static inline int 76 ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) 77 { 78 return 0; 79 } 80 #endif /* CONFIG_EXT3_FS_POSIX_ACL */ 81 82