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_DATA_PREFIX        "rbd_data."
29#define RBD_ID_PREFIX          "rbd_id."
30
31/*
32 * For format version 1, rbd image 'foo' consists of objects
33 *   foo.rbd		- image metadata
34 *   rb.<idhi>.<idlo>.00000000
35 *   rb.<idhi>.<idlo>.00000001
36 *   ...		- data
37 * There is no notion of a persistent image id in rbd format 1.
38 */
39
40#define RBD_SUFFIX		".rbd"
41
42#define RBD_DIRECTORY           "rbd_directory"
43#define RBD_INFO                "rbd_info"
44
45#define RBD_DEFAULT_OBJ_ORDER	22   /* 4MB */
46#define RBD_MIN_OBJ_ORDER       16
47#define RBD_MAX_OBJ_ORDER       30
48
49#define RBD_COMP_NONE		0
50#define RBD_CRYPT_NONE		0
51
52#define RBD_HEADER_TEXT		"<<< Rados Block Device Image >>>\n"
53#define RBD_HEADER_SIGNATURE	"RBD"
54#define RBD_HEADER_VERSION	"001.005"
55
56struct rbd_image_snap_ondisk {
57	__le64 id;
58	__le64 image_size;
59} __attribute__((packed));
60
61struct rbd_image_header_ondisk {
62	char text[40];
63	char object_prefix[24];
64	char signature[4];
65	char version[8];
66	struct {
67		__u8 order;
68		__u8 crypt_type;
69		__u8 comp_type;
70		__u8 unused;
71	} __attribute__((packed)) options;
72	__le64 image_size;
73	__le64 snap_seq;
74	__le32 snap_count;
75	__le32 reserved;
76	__le64 snap_names_len;
77	struct rbd_image_snap_ondisk snaps[0];
78} __attribute__((packed));
79
80
81#endif
82