1 /* 2 * Ceph - scalable distributed file system 3 * 4 * Copyright (C) 2004-2010 Sage Weil <sage@newdream.net> 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 /* For format version 2, rbd image 'foo' consists of objects 19 * rbd_id.foo - id of image 20 * rbd_header.<id> - image metadata 21 * rbd_data.<id>.0000000000000000 22 * rbd_data.<id>.0000000000000001 23 * ... - data 24 * Clients do not access header data directly in rbd format 2. 25 */ 26 27 #define RBD_HEADER_PREFIX "rbd_header." 28 #define RBD_ID_PREFIX "rbd_id." 29 #define RBD_V2_DATA_FORMAT "%s.%016llx" 30 31 #define RBD_LOCK_NAME "rbd_lock" 32 #define RBD_LOCK_TAG "internal" 33 #define RBD_LOCK_COOKIE_PREFIX "auto" 34 35 enum rbd_notify_op { 36 RBD_NOTIFY_OP_ACQUIRED_LOCK = 0, 37 RBD_NOTIFY_OP_RELEASED_LOCK = 1, 38 RBD_NOTIFY_OP_REQUEST_LOCK = 2, 39 RBD_NOTIFY_OP_HEADER_UPDATE = 3, 40 }; 41 42 /* 43 * For format version 1, rbd image 'foo' consists of objects 44 * foo.rbd - image metadata 45 * rb.<idhi>.<idlo>.<extra>.000000000000 46 * rb.<idhi>.<idlo>.<extra>.000000000001 47 * ... - data 48 * There is no notion of a persistent image id in rbd format 1. 49 */ 50 51 #define RBD_SUFFIX ".rbd" 52 #define RBD_V1_DATA_FORMAT "%s.%012llx" 53 54 #define RBD_DIRECTORY "rbd_directory" 55 #define RBD_INFO "rbd_info" 56 57 #define RBD_DEFAULT_OBJ_ORDER 22 /* 4MB */ 58 #define RBD_MIN_OBJ_ORDER 16 59 #define RBD_MAX_OBJ_ORDER 30 60 61 #define RBD_HEADER_TEXT "<<< Rados Block Device Image >>>\n" 62 #define RBD_HEADER_SIGNATURE "RBD" 63 #define RBD_HEADER_VERSION "001.005" 64 65 struct rbd_image_snap_ondisk { 66 __le64 id; 67 __le64 image_size; 68 } __attribute__((packed)); 69 70 struct rbd_image_header_ondisk { 71 char text[40]; 72 char object_prefix[24]; 73 char signature[4]; 74 char version[8]; 75 struct { 76 __u8 order; 77 __u8 crypt_type; 78 __u8 comp_type; 79 __u8 unused; 80 } __attribute__((packed)) options; 81 __le64 image_size; 82 __le64 snap_seq; 83 __le32 snap_count; 84 __le32 reserved; 85 __le64 snap_names_len; 86 struct rbd_image_snap_ondisk snaps[0]; 87 } __attribute__((packed)); 88 89 90 #endif 91