1 /* 2 * Ceph - scalable distributed file system 3 * 4 * Copyright (C) 2004-2010 Sage Weil <[email protected]> 5 * 6 * This is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License version 2.1, as published by the Free Software 9 * Foundation. See file COPYING. 10 * 11 */ 12 13 #ifndef CEPH_RBD_TYPES_H 14 #define CEPH_RBD_TYPES_H 15 16 #include <linux/types.h> 17 18 /* 19 * rbd image 'foo' consists of objects 20 * foo.rbd - image metadata 21 * foo.00000000 22 * foo.00000001 23 * ... - data 24 */ 25 26 #define RBD_SUFFIX ".rbd" 27 #define RBD_DIRECTORY "rbd_directory" 28 #define RBD_INFO "rbd_info" 29 30 #define RBD_DEFAULT_OBJ_ORDER 22 /* 4MB */ 31 #define RBD_MIN_OBJ_ORDER 16 32 #define RBD_MAX_OBJ_ORDER 30 33 34 #define RBD_MAX_SEG_NAME_LEN 128 35 36 #define RBD_COMP_NONE 0 37 #define RBD_CRYPT_NONE 0 38 39 #define RBD_HEADER_TEXT "<<< Rados Block Device Image >>>\n" 40 #define RBD_HEADER_SIGNATURE "RBD" 41 #define RBD_HEADER_VERSION "001.005" 42 43 struct rbd_image_snap_ondisk { 44 __le64 id; 45 __le64 image_size; 46 } __attribute__((packed)); 47 48 struct rbd_image_header_ondisk { 49 char text[40]; 50 char object_prefix[24]; 51 char signature[4]; 52 char version[8]; 53 struct { 54 __u8 order; 55 __u8 crypt_type; 56 __u8 comp_type; 57 __u8 unused; 58 } __attribute__((packed)) options; 59 __le64 image_size; 60 __le64 snap_seq; 61 __le32 snap_count; 62 __le32 reserved; 63 __le64 snap_names_len; 64 struct rbd_image_snap_ondisk snaps[0]; 65 } __attribute__((packed)); 66 67 68 #endif 69