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Re: [Qemu-devel] [PATCH v2 9/9] tests: Add coverage for recent block geo

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v2 9/9] tests: Add coverage for recent block geometry fixes
Date: Mon, 21 Nov 2016 10:16:00 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/21/2016 05:38 AM, Kevin Wolf wrote:
>> And now with my last response to patch 5, I do know. So because the
>> "align" option isn't set, the request_alignment defaults to 512.
>> blkdebug will accept requests and pass them on even if they're not
>> aligned to pdiscard_alignment, so that's similar to how iscsi only drops
>> discard requests that are not aligned to request_alignment but passes
>> everything on regardless of whether it's aligned to pdiscard_alignment.
> If the 512 byte alignment is important, please make it explicit. I have
> a patch to make blkdebug work with byte alignment and then the default
> will be 1.

In fact, I just rebased my patches on top of your blkdebug cleanup
(since it was visible on your remove-aio-em branch), even though it
hasn't been posted to the list yet, and doing that let me fix the
regression on iotest 98 that was pointed out by Max on 7/9.  So I'll
wait to post v3 until your byte-based blkdebug patch has hit the list.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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