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377cc15bf1
copy-before-write functions always run under BQL. Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com> Message-Id: <20220303151616.325444-24-eesposit@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/*
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* copy-before-write filter driver
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*
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* The driver performs Copy-Before-Write (CBW) operation: it is injected above
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* some node, and before each write it copies _old_ data to the target node.
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*
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* Copyright (c) 2018-2021 Virtuozzo International GmbH.
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*
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* Author:
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* Sementsov-Ogievskiy Vladimir <vsementsov@virtuozzo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef COPY_BEFORE_WRITE_H
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#define COPY_BEFORE_WRITE_H
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#include "block/block_int.h"
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#include "block/block-copy.h"
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/*
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* Global state (GS) API. These functions run under the BQL.
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*
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* See include/block/block-global-state.h for more information about
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* the GS API.
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*/
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BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
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BlockDriverState *target,
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const char *filter_node_name,
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BlockCopyState **bcs,
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Error **errp);
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void bdrv_cbw_drop(BlockDriverState *bs);
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#endif /* COPY_BEFORE_WRITE_H */
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