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_object_map.<id> - optional image object map 22 * rbd_data.<id>.0000000000000000 23 * rbd_data.<id>.0000000000000001 24 * ... - data 25 * Clients do not access header data directly in rbd format 2. 26 */ 27 28 #define RBD_HEADER_PREFIX "rbd_header." 29 #define RBD_OBJECT_MAP_PREFIX "rbd_object_map." 30 #define RBD_ID_PREFIX "rbd_id." 31 #define RBD_V2_DATA_FORMAT "%s.%016llx" 32 33 #define RBD_LOCK_NAME "rbd_lock" 34 #define RBD_LOCK_TAG "internal" 35 #define RBD_LOCK_COOKIE_PREFIX "auto" 36 37 enum rbd_notify_op { 38 RBD_NOTIFY_OP_ACQUIRED_LOCK = 0, 39 RBD_NOTIFY_OP_RELEASED_LOCK = 1, 40 RBD_NOTIFY_OP_REQUEST_LOCK = 2, 41 RBD_NOTIFY_OP_HEADER_UPDATE = 3, 42 }; 43 44 #define OBJECT_NONEXISTENT 0 45 #define OBJECT_EXISTS 1 46 #define OBJECT_PENDING 2 47 #define OBJECT_EXISTS_CLEAN 3 48 49 #define RBD_FLAG_OBJECT_MAP_INVALID (1ULL << 0) 50 #define RBD_FLAG_FAST_DIFF_INVALID (1ULL << 1) 51 52 /* 53 * For format version 1, rbd image 'foo' consists of objects 54 * foo.rbd - image metadata 55 * rb.<idhi>.<idlo>.<extra>.000000000000 56 * rb.<idhi>.<idlo>.<extra>.000000000001 57 * ... - data 58 * There is no notion of a persistent image id in rbd format 1. 59 */ 60 61 #define RBD_SUFFIX ".rbd" 62 #define RBD_V1_DATA_FORMAT "%s.%012llx" 63 64 #define RBD_DIRECTORY "rbd_directory" 65 #define RBD_INFO "rbd_info" 66 67 #define RBD_DEFAULT_OBJ_ORDER 22 /* 4MB */ 68 #define RBD_MIN_OBJ_ORDER 16 69 #define RBD_MAX_OBJ_ORDER 30 70 71 #define RBD_HEADER_TEXT "<<< Rados Block Device Image >>>\n" 72 #define RBD_HEADER_SIGNATURE "RBD" 73 #define RBD_HEADER_VERSION "001.005" 74 75 struct rbd_image_snap_ondisk { 76 __le64 id; 77 __le64 image_size; 78 } __attribute__((packed)); 79 80 struct rbd_image_header_ondisk { 81 char text[40]; 82 char object_prefix[24]; 83 char signature[4]; 84 char version[8]; 85 struct { 86 __u8 order; 87 __u8 crypt_type; 88 __u8 comp_type; 89 __u8 unused; 90 } __attribute__((packed)) options; 91 __le64 image_size; 92 __le64 snap_seq; 93 __le32 snap_count; 94 __le32 reserved; 95 __le64 snap_names_len; 96 struct rbd_image_snap_ondisk snaps[]; 97 } __attribute__((packed)); 98 99 100 #endif 101