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


From: Christoph Hellwig
Subject: Re: [PATCH 1/2] block:hdev: support BLKSECDISCARD
Date: Tue, 16 Nov 2021 21:53:39 -0800

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.

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..



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