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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_image_snap_ondisk {
45 __le64 id;
46 __le64 image_size;
47} __attribute__((packed));
48
49struct rbd_image_header_ondisk {
50 char text[40];
51 char block_name[24];
52 char signature[4];
53 char version[8];
54 struct {
55 __u8 order;
56 __u8 crypt_type;
57 __u8 comp_type;
58 __u8 unused;
59 } __attribute__((packed)) options;
60 __le64 image_size;
61 __le64 snap_seq;
62 __le32 snap_count;
63 __le32 reserved;
64 __le64 snap_names_len;
65 struct rbd_image_snap_ondisk snaps[0];
66} __attribute__((packed));
67
68
69#endif