diff options
Diffstat (limited to 'block/copy-before-write.h')
| -rw-r--r-- | block/copy-before-write.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/block/copy-before-write.h b/block/copy-before-write.h new file mode 100644 index 0000000000..5977b7aa31 --- /dev/null +++ b/block/copy-before-write.h @@ -0,0 +1,42 @@ +/* + * copy-before-write 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) 2018-2021 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 COPY_BEFORE_WRITE_H +#define COPY_BEFORE_WRITE_H + +#include "block/block_int.h" +#include "block/block-copy.h" + +BlockDriverState *bdrv_cbw_append(BlockDriverState *source, + BlockDriverState *target, + const char *filter_node_name, + uint64_t cluster_size, + BackupPerf *perf, + BdrvRequestFlags write_flags, + BlockCopyState **bcs, + Error **errp); +void bdrv_cbw_drop(BlockDriverState *bs); + +#endif /* COPY_BEFORE_WRITE_H */ |