On Mon, May 21, 2012 at 05:08:29PM +0800, Asias He wrote: > When user hot-unplug a disk which is busy serving I/O, __blk_run_queue > might be unable to drain all the requests. As a result, the > blk_drain_queue() would loop forever and blk_cleanup_queue would not > return. So hot-unplug will fail. > > This patch adds a callback in blk_drain_queue() for low lever driver to > abort requests. > > Currently, this is useful for virtio-blk to do cleanup in hot-unplug.
Why is this necessary? virtio-blk should know that the device is gone and fail in-flight / new commands. That's what other drivers do. What makes virtio-blk different? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
