On Wed, Jul 26, 2023 at 09:48:07AM +0200, Stefano Garzarella wrote:
> qemu_open() in blkio_virtio_blk_common_open() is used to open the
> character device (e.g. /dev/vhost-vdpa-0 or /dev/vfio/vfio) or in
> the future eventually the unix socket.
>
> In all these cases we cannot open the path in read-only mode,
> when the `read-only` option of blockdev is on, because the exchange
> of IOCTL commands for example will fail.
>
> In order to open the device read-only, we have to use the `read-only`
> property of the libblkio driver as we already do in blkio_file_open().
>
> Fixes: cad2ccc395 ("block/blkio: use qemu_open() to support fd passing for
> virtio-blk")
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2225439
> Reported-by: Qing Wang <qinw...@redhat.com>
> Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
> ---
>
> Notes:
> v2:
> - added comment on top of qemu_open() [Daniel]
>
> v1:
> https://lore.kernel.org/qemu-devel/20230725111155.85426-1-sgarz...@redhat.com/
>
> block/blkio.c | 21 ++++++++++++---------
> 1 file changed, 12 insertions(+), 9 deletions(-)
Reviewed-by: Daniel P. Berrangé <berra...@redhat.com>
With regards,
Daniel
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