Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
[qemu/ar7.git] / block / parallels.h
blobf22f43f988bbcdf3640c2cbc510f3a8cbcafbb07
1 /*
2 * Block driver for Parallels disk image format
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>
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
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:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
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.
32 #ifndef BLOCK_PARALLELS_H
33 #define BLOCK_PARALLELS_H
34 #include "qemu/coroutine.h"
36 #define HEADS_NUMBER 16
37 #define SEC_IN_CYL 32
38 #define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
40 /* always little-endian */
41 typedef 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 uint32_t flags;
52 uint64_t ext_off;
53 } QEMU_PACKED ParallelsHeader;
55 typedef enum ParallelsPreallocMode {
56 PRL_PREALLOC_MODE_FALLOCATE = 0,
57 PRL_PREALLOC_MODE_TRUNCATE = 1,
58 PRL_PREALLOC_MODE__MAX = 2,
59 } ParallelsPreallocMode;
61 typedef struct BDRVParallelsState {
62 /** Locking is conservative, the lock protects
63 * - image file extending (truncate, fallocate)
64 * - any access to block allocation table
66 CoMutex lock;
68 ParallelsHeader *header;
69 uint32_t header_size;
70 bool header_unclean;
72 unsigned long *bat_dirty_bmap;
73 unsigned int bat_dirty_block;
75 uint32_t *bat_bitmap;
76 unsigned int bat_size;
78 int64_t data_end;
79 uint64_t prealloc_size;
80 ParallelsPreallocMode prealloc_mode;
82 unsigned int tracks;
83 unsigned int cluster_size;
85 unsigned int off_multiplier;
86 Error *migration_blocker;
87 } BDRVParallelsState;
89 int parallels_read_format_extension(BlockDriverState *bs,
90 int64_t ext_off, Error **errp);
92 #endif