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Vladimir Sementsov-Ogievskiyd003e0a2021-08-24 11:38:27 +03001/*
2 * copy-before-write filter driver
3 *
4 * The driver performs Copy-Before-Write (CBW) operation: it is injected above
5 * some node, and before each write it copies _old_ data to the target node.
6 *
7 * Copyright (c) 2018-2021 Virtuozzo International GmbH.
8 *
9 * Author:
10 * Sementsov-Ogievskiy Vladimir <vsementsov@virtuozzo.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 */
25
26#ifndef COPY_BEFORE_WRITE_H
27#define COPY_BEFORE_WRITE_H
28
29#include "block/block_int.h"
30#include "block/block-copy.h"
31
Emanuele Giuseppe Esposito377cc152022-03-03 10:16:08 -050032/*
33 * Global state (GS) API. These functions run under the BQL.
34 *
35 * See include/block/block-global-state.h for more information about
36 * the GS API.
37 */
38
Vladimir Sementsov-Ogievskiyd003e0a2021-08-24 11:38:27 +030039BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
40 BlockDriverState *target,
41 const char *filter_node_name,
Vladimir Sementsov-Ogievskiy0fd05c82024-03-13 18:28:21 +030042 bool discard_source,
Fiona Ebner6252deb2024-07-11 14:09:15 +020043 uint64_t min_cluster_size,
Vladimir Sementsov-Ogievskiyd003e0a2021-08-24 11:38:27 +030044 BlockCopyState **bcs,
45 Error **errp);
46void bdrv_cbw_drop(BlockDriverState *bs);
47
48#endif /* COPY_BEFORE_WRITE_H */