1/*
2* Block driver for Parallels disk image format
3*
4* Copyright (c) 2015-2017 Virtuozzo, Inc.
5* Authors:
6* 2016-2017 Klim S. Kireev <klim.kireev@virtuozzo.com>
7* 2015 Denis V. Lunev <den@openvz.org>
8*
9* This code was originally based on comparing different disk images created
10* by Parallels. Currently it is based on opened OpenVZ sources
11* available at
12* https://github.com/OpenVZ/ploop
13*
14* Permission is hereby granted, free of charge, to any person obtaining a copy
15* of this software and associated documentation files (the "Software"), to deal
16* in the Software without restriction, including without limitation the rights
17* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18* copies of the Software, and to permit persons to whom the Software is
19* furnished to do so, subject to the following conditions:
20*
21* The above copyright notice and this permission notice shall be included in
22* all copies or substantial portions of the Software.
23*
24* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30* THE SOFTWARE.
31*/
32#ifndef BLOCK_PARALLELS_H
33#define BLOCK_PARALLELS_H
34#include "qemu/coroutine.h"
35
36#define HEADS_NUMBER 16
37#define SEC_IN_CYL 32
38#define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
39
40/* always little-endian */
41typedef struct ParallelsHeader {
42 char magic[16]; /* "WithoutFreeSpace" */
43 uint32_t version;
44 uint32_t heads;
45 uint32_t cylinders;
46 uint32_t tracks;
47 uint32_t bat_entries;
48 uint64_t nb_sectors;
49 uint32_t inuse;
50 uint32_t data_off;
51 char padding[12];
52} QEMU_PACKED ParallelsHeader;
53
54typedef enum ParallelsPreallocMode {
55 PRL_PREALLOC_MODE_FALLOCATE = 0,
56 PRL_PREALLOC_MODE_TRUNCATE = 1,
57 PRL_PREALLOC_MODE__MAX = 2,
58} ParallelsPreallocMode;
59
60typedef struct BDRVParallelsState {
61 /** Locking is conservative, the lock protects
62 * - image file extending (truncate, fallocate)
63 * - any access to block allocation table
64 */
65 CoMutex lock;
66
67 ParallelsHeader *header;
68 uint32_t header_size;
69 bool header_unclean;
70
71 unsigned long *bat_dirty_bmap;
72 unsigned int bat_dirty_block;
73
74 uint32_t *bat_bitmap;
75 unsigned int bat_size;
76
77 int64_t data_end;
78 uint64_t prealloc_size;
79 ParallelsPreallocMode prealloc_mode;
80
81 unsigned int tracks;
82
83 unsigned int off_multiplier;
84 Error *migration_blocker;
85} BDRVParallelsState;
86
87#endif
88