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This patch extends the blockdev-backup QMP command to allow users to specify how to behave when IO errors occur during copy-before-write operations. Previously, the behavior was fixed and could not be controlled by the user. The new 'on-cbw-error' option can be set to one of two values: - 'break-guest-write': Forwards the IO error to the guest and triggers the on-source-error policy. This preserves snapshot integrity at the expense of guest IO operations. - 'break-snapshot': Allows the guest OS to continue running normally, but invalidates the snapshot and aborts related jobs. This prioritizes guest operation over backup consistency. This enhancement provides more flexibility for backup operations in different environments where requirements for guest availability versus backup consistency may vary. The default behavior remains unchanged to maintain backward compatibility. Signed-off-by: Raman Dzehtsiar <Raman.Dzehtsiar@gmail.com> Message-ID: <20250414090025.828660-1-Raman.Dzehtsiar@gmail.com> Acked-by: Markus Armbruster <armbru@redhat.com> [vsementsov: fix long lines] Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Tested-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
49 lines
1.8 KiB
C
49 lines
1.8 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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bool discard_source,
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uint64_t min_cluster_size,
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BlockCopyState **bcs,
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OnCbwError on_cbw_error,
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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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