Re: [PATCH 1/2] block: also mark disk-owned queues as dying in __blk_mark_disk_dead

[Christoph Hellwig <hch@lst.de>]

On Wed, Oct 09, 2024 at 09:31:23PM +0900, Sergey Senozhatsky wrote:
> >  	if (!test_bit(GD_OWNS_QUEUE, &disk->state)) {
> > +		if (test_bit(QUEUE_FLAG_RESURRECT, &q->queue_flags)) {
> > +			clear_bit(QUEUE_FLAG_DYING, &q->queue_flags);
> > +			clear_bit(QUEUE_FLAG_RESURRECT, &q->queue_flags);
> > +		}
> 
> Christoph, shouldn't QUEUE_FLAG_RESURRECT handling be outside of
> GD_OWNS_QUEUE if-block? Because __blk_mark_disk_dead() sets
> QUEUE_FLAG_DYING/QUEUE_FLAG_RESURRECT regardless of GD_OWNS_QUEUE.

For !GD_OWNS_QUEUE the queue is freed right below, so there isn't much
of a point.

> // A silly nit: it seems the code uses blk_queue_flag_set() and
> // blk_queue_flag_clear() helpers, but there is no queue_flag_test(),
> // I don't know what if the preference here - stick to queue_flag
> // helpers, or is it ok to mix them.

Yeah.  I looked into a test_and_set wrapper, but then saw how pointless
the existing wrappers are.  So for now this just open codes it, and
once we're done with the fixes I plan to just send a patch to remove
the wrappers entirely.