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block: access copy_on_read with atomic ops

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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20170605123908.18777-2-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini
2017-06-05 14:38:50 +02:00
committed by Fam Zheng
parent 79f24568e5
commit d3faa13e5f
4 changed files with 15 additions and 12 deletions
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2
blockdev.c
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@@ -1791,7 +1791,7 @@ static void external_snapshot_commit(BlkActionState *common)
/* We don't need (or want) to use the transactional
* bdrv_reopen_multiple() across all the entries at once, because we
* don't want to abort all of them if one of them fails the reopen */
if (!state->old_bs->copy_on_read) {
if (!atomic_read(&state->old_bs->copy_on_read)) {
bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
NULL);
}