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Re: [Qemu-devel] [PATCH] qcow2: Switch L1 table in a single sequence
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] qcow2: Switch L1 table in a single sequence |
Date: |
Wed, 2 Oct 2013 15:38:33 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Sep 30, 2013 at 05:57:21PM +0200, 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 not a good idea when the old L1 table is no longer valid and the address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(-)
Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block
Stefan