mirror of https://gitee.com/openkylin/qemu.git
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/*
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* Block driver for Parallels disk image format
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*
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* Copyright (c) 2015-2017 Virtuozzo, Inc.
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* Authors:
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* 2016-2017 Klim S. Kireev <klim.kireev@virtuozzo.com>
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* 2015 Denis V. Lunev <den@openvz.org>
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*
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* This code was originally based on comparing different disk images created
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* by Parallels. Currently it is based on opened OpenVZ sources
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* available at
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* https://github.com/OpenVZ/ploop
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef BLOCK_PARALLELS_H
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#define BLOCK_PARALLELS_H
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#include "qemu/coroutine.h"
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#define HEADS_NUMBER 16
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#define SEC_IN_CYL 32
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#define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
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/* always little-endian */
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typedef struct ParallelsHeader {
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char magic[16]; /* "WithoutFreeSpace" */
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uint32_t version;
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uint32_t heads;
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uint32_t cylinders;
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uint32_t tracks;
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uint32_t bat_entries;
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uint64_t nb_sectors;
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uint32_t inuse;
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uint32_t data_off;
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uint32_t flags;
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uint64_t ext_off;
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} QEMU_PACKED ParallelsHeader;
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typedef enum ParallelsPreallocMode {
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PRL_PREALLOC_MODE_FALLOCATE = 0,
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PRL_PREALLOC_MODE_TRUNCATE = 1,
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PRL_PREALLOC_MODE__MAX = 2,
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} ParallelsPreallocMode;
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typedef struct BDRVParallelsState {
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/** Locking is conservative, the lock protects
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* - image file extending (truncate, fallocate)
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* - any access to block allocation table
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*/
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CoMutex lock;
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ParallelsHeader *header;
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uint32_t header_size;
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bool header_unclean;
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unsigned long *bat_dirty_bmap;
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unsigned int bat_dirty_block;
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uint32_t *bat_bitmap;
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unsigned int bat_size;
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int64_t data_end;
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uint64_t prealloc_size;
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ParallelsPreallocMode prealloc_mode;
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unsigned int tracks;
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unsigned int cluster_size;
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unsigned int off_multiplier;
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Error *migration_blocker;
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} BDRVParallelsState;
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int parallels_read_format_extension(BlockDriverState *bs,
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int64_t ext_off, Error **errp);
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#endif
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