queue reference counting

Nick Piggin
2003-08-07T09:20:51Z

Jens Axboe wrote:

>On Thu, Aug 07 2003, Pavel Machek wrote:
>
>>Hi!
>>
>>
>>>I ported `subj` to 2.6.0-test2. I do not yet have idea if it works,
>>>but it compiles ;-).
>>>
>>It compiles, it event boots, but it does not seem to have much effect
>>:-(.
>>
>
>Now that the queue reference counting is in the current bk tree, we are
>that much closer to real modular io schedulers. I'll post the cfq with
>priorities for that.
>

OK, the QUEUE_FLAG_DEAD. I assume that will be set in blk_cleanup_queue?
Then all remaining requests are flushed out of the queue?

This requires that a driver must be able to continue to process requests
during the call to blk_cleanup_queue, and that blk_cleanup_queue might
block, right? Is this acceptable, or should there be an earlier call to
set QUEUE_FLAG_DEAD and ensure queue is flushed?