block: Use block_job_add_bdrv() in backup_start()
Use block_job_add_bdrv() instead of blocking all operations in backup_start() and unblocking them in backup_run(). Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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