[PATCHv9 3/7] block: allow ability to limit partition write hints

[Keith Busch]

On Mon, Oct 28, 2024 at 12:58:05PM +0100, Christoph Hellwig wrote:
> On Fri, Oct 25, 2024 at 02:36:41PM -0700, Keith Busch wrote:
> > From: Keith Busch <kbusch at kernel.org>
> > 
> > When multiple partitions are used, you may want to enforce different
> > subsets of the available write hints for each partition. Provide a
> > bitmap attribute of the available write hints, and allow an admin to
> > write a different mask to set the partition's allowed write hints.
> 
> Trying my best Greg impersonator voice: This needs to be documented
> in Documentation/ABI/stable/sysfs-block.
> 
> That would have also helped me understanding it.  AFAIK the split here
> is an opt-in, which means the use case I explained in the previous
> case would still not work out of the box, right?

Right.