2 * Copyright (c) 2005 Ivan Voras <ivoras@gmail.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #ifndef _G_VIRSTOR_MD_H_
31 #define _G_VIRSTOR_MD_H_
34 * Metadata declaration
37 #define G_VIRSTOR_MAGIC "GEOM::VIRSTOR"
38 #define G_VIRSTOR_VERSION 1
40 /* flag: provider is allocated */
41 #define VIRSTOR_PROVIDER_ALLOCATED 1
42 /* flag: provider is currently being filled (usually it's the last
43 * provider with VIRSTOR_PROVIDER_ALLOCATED flag */
44 #define VIRSTOR_PROVIDER_CURRENT 2
46 struct g_virstor_metadata {
47 /* Data global to the virstor device */
48 char md_magic[16]; /* Magic value. */
49 uint32_t md_version; /* Version number. */
50 char md_name[16]; /* Device name (e.g. "mydata") */
51 uint32_t md_id; /* Unique ID. */
52 uint64_t md_virsize; /* Virtual device's size */
53 uint32_t md_chunk_size; /* Chunk size in bytes */
54 uint16_t md_count; /* Total number of providers */
56 /* Data local to this provider */
57 char provider[16]; /* Hardcoded provider name */
58 uint16_t no; /* Provider number/index */
59 uint64_t provsize; /* Provider's size */
60 uint32_t chunk_count; /* Number of chunks in this pr. */
61 uint32_t chunk_next; /* Next chunk to allocate */
62 uint16_t chunk_reserved; /* Count of "reserved" chunks */
63 uint16_t flags; /* Provider's flags */
66 void virstor_metadata_encode(struct g_virstor_metadata *md, unsigned char *data);
67 void virstor_metadata_decode(unsigned char *data, struct g_virstor_metadata *md);
69 #endif /* !_G_VIRSTOR_H_ */