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e185100fec
If the operation is failed, we need to check image consistency if the problem is not about memory allocation. Bitmap adjustments in allocate_cluster are not performed yet. They worth to be separate. This was proven useful during debug of this series. Kept as is for future bissecting. It should be specifically noted that used bitmap must be recalculated if data_off has been fixed during image consistency check. Signed-off-by: Denis V. Lunev <den@openvz.org> Reviewed-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
97 lines
3 KiB
C
97 lines
3 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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unsigned long *used_bmap;
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unsigned long used_bmap_size;
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uint32_t *bat_bitmap;
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unsigned int bat_size;
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int64_t data_start;
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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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