block/backup-top.h

   1 /*
   2  * backup-top 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) 2018-2019 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 BACKUP_TOP_H
  27 #define BACKUP_TOP_H
  28
  29 #include "block/block_int.h"
  30 #include "block/block-copy.h"
  31
  32 BlockDriverState *bdrv_backup_top_append(BlockDriverState *source,
  33                                          BlockDriverState *target,
  34                                          const char *filter_node_name,
  35                                          uint64_t cluster_size,
  36                                          BdrvRequestFlags write_flags,
  37                                          BlockCopyState **bcs,
  38                                          Error **errp);
  39 void bdrv_backup_top_drop(BlockDriverState *bs);
  40
  41 #endif /* BACKUP_TOP_H */