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mirror: Quiesce source during "mirror_exit"

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With dataplane, the ioeventfd events could be dispatched after
mirror_run releases the dirty bitmap, but before mirror_exit actually
does the device switch, because the iothread will still be running, and
it will cause silent data loss.

Fix this by adding a bdrv_drained_begin/end pair around the window, so
that no new external request will be handled.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Fam Zheng 2015-11-23 10:28:04 +08:00 committed by Jeff Cody
parent 9d7b969ea6
commit 176c36997f
1 changed files with 4 additions and 0 deletions
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4
block/mirror.c
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@ -388,6 +388,7 @@ static void mirror_exit(BlockJob *job, void *opaque)
bdrv_unref(s->target);
block_job_completed(&s->common, data->ret);
g_free(data);
bdrv_drained_end(src);
bdrv_unref(src);
}
@ -607,6 +608,9 @@ immediate_exit:
data = g_malloc(sizeof(*data));
data->ret = ret;
/* Before we switch to target in mirror_exit, make sure data doesn't
* change. */
bdrv_drained_begin(s->common.bs);
block_job_defer_to_main_loop(&s->common, mirror_exit, data);
}