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Re: [PATCH 3/8] qcow2: Unlock the graph in qcow2_do_open() where necessa


From: Eric Blake
Subject: Re: [PATCH 3/8] qcow2: Unlock the graph in qcow2_do_open() where necessary
Date: Fri, 12 May 2023 11:19:05 -0500
User-agent: NeoMutt/20230512

On Wed, May 10, 2023 at 10:35:56PM +0200, Kevin Wolf wrote:
> 
> qcow2_do_open() calls a few no_co_wrappers that wrap functions taking
> the graph lock internally as a writer. Therefore, it can't hold the
> reader lock across these calls, it causes deadlocks. Drop the lock
> temporarily around the calls.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  block/qcow2.c | 6 ++++++
>  1 file changed, 6 insertions(+)

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org




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