xref: /openbmc/linux/drivers/block/rbd_types.h (revision 53ab8e7c)
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