vdi: make it thread-safe
The VirtualBox driver is using a mutex to order all allocating writes, but it is not protecting accesses to the bitmap because they implicitly happen under the AioContext mutex. Change this to use a CoRwlock explicitly. Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Message-Id: <20170629132749.997-4-pbonzini@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
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