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Re: [Qemu-devel] [PATCH] qcow2: Switch L1 table in a single sequence

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH] qcow2: Switch L1 table in a single sequence
Date: Mon, 30 Sep 2013 11:48:32 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9

On 09/30/2013 09:57 AM, Max Reitz wrote:
> Switching the L1 table in memory should be an atomic operation, as far
> as possible. Calling qcow2_free_clusters on the old L1 table on disk is
> not a good idea when the old L1 table is no longer valid and the address
> to the new one hasn't yet been written into the corresponding
> BDRVQcowState field. To be more specific, this can lead to segfaults due
> to qcow2_check_metadata_overlap trying to access the L1 table during the
> free operation.
> Signed-off-by: Max Reitz <address@hidden>
> ---
>  block/qcow2-cluster.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

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

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