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Re: [Qemu-devel] [PATCH] qcow2: Flush pending discards before allocating

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH] qcow2: Flush pending discards before allocating cluster
Date: Fri, 8 May 2015 12:55:20 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Am 06.05.2015 um 13:29 hat Kevin Wolf geschrieben:
> Before a freed cluster can be reused, pending discards for this cluster
> must be processed.
> The original assumption was that this was not a problem because discards
> are only cached during discard/write zeroes operations, which are
> synchronous so that no concurrent write requests can cause cluster
> allocations.
> However, the discard/write zeroes operation itself can allocate a new L2
> table (and it has to in order to put zero flags there), so make sure we
> can cope with the situation.
> This fixes https://bugs.launchpad.net/bugs/1349972.
> Signed-off-by: Kevin Wolf <address@hidden>

Cc: address@hidden

Applied to my block branch.


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