On Tue, Jan 18, 2022 at 11:47:33PM +0800, Ming Lei wrote:

On Tue, Jan 18, 2022 at 09:22:59AM +0100, Christoph Hellwig wrote:

quoted

How does this work for SCSI where we can detach the disk from the
request queue, reattach it and then maybe later free them both?

Commit 8e141f9eb803 ("block: drain file system I/O on del_gendisk") has
marked queue as dying, so how can the above case work given no any code
clears the queue's dying flag?

oops, my fault, blk_queue_start_drain() actually doesn't set
QUEUE_FLAG_DYING, so the rettach case works with commit 8e141f9eb803.


Thanks,
Ming