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/*
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_OBJ_NAME_LEN	96
35#define RBD_MAX_SEG_NAME_LEN	128
36
37#define RBD_COMP_NONE		0
38#define RBD_CRYPT_NONE		0
39
40#define RBD_HEADER_TEXT		"<<< Rados Block Device Image >>>\n"
41#define RBD_HEADER_SIGNATURE	"RBD"
42#define RBD_HEADER_VERSION	"001.005"
43
44struct rbd_info {
45	__le64 max_id;
46} __attribute__ ((packed));
47
48struct rbd_image_snap_ondisk {
49	__le64 id;
50	__le64 image_size;
51} __attribute__((packed));
52
53struct rbd_image_header_ondisk {
54	char text[40];
55	char block_name[24];
56	char signature[4];
57	char version[8];
58	struct {
59		__u8 order;
60		__u8 crypt_type;
61		__u8 comp_type;
62		__u8 unused;
63	} __attribute__((packed)) options;
64	__le64 image_size;
65	__le64 snap_seq;
66	__le32 snap_count;
67	__le32 reserved;
68	__le64 snap_names_len;
69	struct rbd_image_snap_ondisk snaps[0];
70} __attribute__((packed));
71
72
73#endif
74