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 
44 struct rbd_info {
45 	__le64 max_id;
46 } __attribute__ ((packed));
47 
48 struct rbd_image_snap_ondisk {
49 	__le64 id;
50 	__le64 image_size;
51 } __attribute__((packed));
52 
53 struct 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