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Re: [Qemu-block] [Qemu-devel] [PATCH 5/5] block: Move request_alignment

From: Paolo Bonzini
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 5/5] block: Move request_alignment into BlockLimit
Date: Tue, 7 Jun 2016 13:04:17 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

On 07/06/2016 12:08, Kevin Wolf wrote:
>>> > > Something in this patch is causing qemu-iotests 77 to infloop; we may
>>> > > decide it is just easier to drop this patch rather than find all the
>>> > > places where the request_alignment must be preserved across what
>>> > > otherwise zeroes out limits.
>> > 
>> > Found it; squash this in (or use it as an argument why we don't want
>> > request_alignment in bs->bl after all):
> This hunk doesn't make sense to me. For the correctness of the code it
> shouldn't make a difference whether the alignment happens before passing
> the request to file/raw-posix or already in the raw format layer.
> The cause for the hang you're seeing is probably that the request is
> already aligned before the blkdebug layer and therefore the blkdebug
> events aren't generated any more. That's a problem with the test (I'm
> considering the blkdebug events part of the test infrastructure),
> however, and not with the code.

Perhaps you could add an alignment option to blkdebug (or in general
options to force block limits on blkdebug), which would help testing in



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