Re: [PATCH 1/2] block:hdev: support BLKSECDISCARD

[Stefan Hajnoczi]

On Tue, Nov 16, 2021 at 09:53:39PM -0800, Christoph Hellwig wrote:
> On Tue, Nov 16, 2021 at 10:58:30AM +0000, Stefan Hajnoczi wrote:
> > Question for Jens and Christoph:
> > 
> > Is there a way for userspace to detect whether a Linux block device
> > supports SECDISCARD?
> 
> I don't know of one.
> 
> > If not, then maybe a new sysfs attribute can be added:
> 
> This looks correct, but if we start looking into SECDISCARD seriously
> I'd like to split the max_sectors settings for it from discard as that
> is currently a bit of a mess.  If we then expose the secure erase max
> sectors in sysfs that would also be a good indicator.

That is probably better because userspace would the queue limits
information too. Thanks!

> What is the use case for exposing secure erase in qemu?  The whole
> concept for a LBA based secure erase is generally not a very smart
> idea for flash based media..

Yadong, please see Christoph's question above.

Stefan

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