7df7868b96
Backup-top filter caches write operations and does copy-before-write operations. The driver will be used in backup instead of write-notifiers. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20191001131409.14202-5-vsementsov@virtuozzo.com Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
/*
|
|
* backup-top filter driver
|
|
*
|
|
* The driver performs Copy-Before-Write (CBW) operation: it is injected above
|
|
* some node, and before each write it copies _old_ data to the target node.
|
|
*
|
|
* Copyright (c) 2018-2019 Virtuozzo International GmbH.
|
|
*
|
|
* Author:
|
|
* Sementsov-Ogievskiy Vladimir <vsementsov@virtuozzo.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef BACKUP_TOP_H
|
|
#define BACKUP_TOP_H
|
|
|
|
#include "block/block_int.h"
|
|
#include "block/block-copy.h"
|
|
|
|
BlockDriverState *bdrv_backup_top_append(BlockDriverState *source,
|
|
BlockDriverState *target,
|
|
const char *filter_node_name,
|
|
uint64_t cluster_size,
|
|
BdrvRequestFlags write_flags,
|
|
BlockCopyState **bcs,
|
|
Error **errp);
|
|
void bdrv_backup_top_drop(BlockDriverState *bs);
|
|
|
|
#endif /* BACKUP_TOP_H */
|