On Thu, Apr 18, 2013 at 09:05:52AM +0800, Asias He wrote:
> This helper is useful to check if a feature is supported.
>
> Signed-off-by: Asias He <asias@xxxxxxxxxx>
> Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Why do we need the locking here by the way?
It seems features don't change while vhost
is running.
> ---
> drivers/vhost/tcm_vhost.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
> index 957a0b9..88ebb79 100644
> --- a/drivers/vhost/tcm_vhost.c
> +++ b/drivers/vhost/tcm_vhost.c
> @@ -99,6 +99,18 @@ static int iov_num_pages(struct iovec *iov)
> ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
> }
>
> +static bool tcm_vhost_check_feature(struct vhost_scsi *vs, int feature)
> +{
> + bool ret = false;
> +
> + mutex_lock(&vs->dev.mutex);
> + if (vhost_has_feature(&vs->dev, feature))
> + ret = true;
> + mutex_unlock(&vs->dev.mutex);
> +
> + return ret;
> +}
> +
> static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
> {
> return 1;
> --
> 1.8.1.4
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