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From: Kevin Wolf <kwolf@redhat.com>
To: qemu-block@nongnu.org
Cc: qemu-stable@nongnu.org, qemu-devel@nongnu.org, mreitz@redhat.com
Subject: Re: [Qemu-devel] [PATCH] qcow2: Flush pending discards before allocating cluster
Date: Fri, 8 May 2015 12:55:20 +0200	[thread overview]
Message-ID: <20150508105520.GH4318@noname.redhat.com> (raw)
In-Reply-To: <1430911774-19006-1-git-send-email-kwolf@redhat.com>

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 <kwolf@redhat.com>

Cc: qemu-stable@nongnu.org

Applied to my block branch.

Kevin

      parent reply	other threads:[~2015-05-08 10:55 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-06 11:29 [Qemu-devel] [PATCH] qcow2: Flush pending discards before allocating cluster Kevin Wolf
2015-05-06 13:31 ` Max Reitz
2015-05-08 10:55 ` Kevin Wolf [this message]

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