[PATCH 1/4] block: don't unconditionally set max_discard_sectors in blk_queue_max_discard_sectors

[Keith Busch]

On Wed, Jul 12, 2023 at 06:23:10PM +0200, Christoph Hellwig wrote:
> On Mon, Jul 10, 2023 at 06:42:36PM +0800, Ming Lei wrote:
> > Userspace may write 0 to discard_max_bytes, and this patch still can
> > override user setting.
> 
> True.  Maybe the right thing is to have a user_limit field, and just
> looks at the min of that and the hw limit everywhere.  These hardware
> vs user limits are a pain, and we'll probably need some proper
> infrastructure for them :P

Yeah, I had to do something very similiar for the max_sectors limit too:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=c9c77418a98273fe96835c42666f7427b3883f48