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From cfdd0c5695fc86b7f016dbe6e40342020a4931a4 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Wed, 18 Jul 2018 22:54:53 +0200
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Subject: [PATCH 235/268] block/backup: disable copy offloading for backup
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180718225511.14878-18-jsnow@redhat.com>
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Patchwork-id: 81417
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 17/35] block/backup: disable copy offloading for backup
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Bugzilla: 1207657
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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Downstream only for 2.12.0; there are several upstream fixes that fix
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the copy_range support for block/backup that are in 3.0 that we're not
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prepared to backport to 2.12.0.
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For now, then, hardcode block/backup to use the old bounce buffer method
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that works without additional caveats.
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/backup.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/block/backup.c b/block/backup.c
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index d26eeb5..adb3cbd 100644
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--- a/block/backup.c
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+++ b/block/backup.c
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@@ -727,7 +727,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
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} else {
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job->cluster_size = MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size);
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}
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- job->use_copy_range = true;
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+ job->use_copy_range = false;
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job->copy_range_size = MIN_NON_ZERO(blk_get_max_transfer(job->common.blk),
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blk_get_max_transfer(job->target));
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job->copy_range_size = MAX(job->cluster_size,
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--
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1.8.3.1
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