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Re: [Qemu-block] [PATCH v15 21/25] qcow2-bitmap: refcounts

From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH v15 21/25] qcow2-bitmap: refcounts
Date: Thu, 16 Feb 2017 15:27:13 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Am 15.02.2017 um 11:10 hat Vladimir Sementsov-Ogievskiy geschrieben:
> Calculate refcounts for qcow2 bitmaps. It is needed for qcow2's qemu-img
> check implementation.
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> Reviewed-by: Max Reitz <address@hidden>
> Reviewed-by: John Snow <address@hidden>

Maybe this should come earlier in the series so that qemu-img check
doesn't corrupt them. Basically it's needed as soon as we add the
autoclear flag as supported.

Anyway, the actual point I was going to make is that it would be good to
have a qemu-iotests case which actually invokes qemu-img check on an
image with dirty bitmaps. In general, the test case side of the series
seems to be rather weak so far. Just keep in mind that I won't feel bad
for breaking anything that isn't tested by a test case. So if you like
to keep persistent bitmaps working in the long run, you'd better write
tests and give me no chance to break anything without them failing.


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