On Wed, Mar 06, 2013 at 02:16:27PM +0800, Asias He wrote:
> This helper is useful to check if a feature is supported.
>
> Signed-off-by: Asias He <asias@xxxxxxxxxx>
> ---
> drivers/vhost/tcm_vhost.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
> index b3e50d7..fdbf986 100644
> --- a/drivers/vhost/tcm_vhost.c
> +++ b/drivers/vhost/tcm_vhost.c
> @@ -91,6 +91,20 @@ 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, u64 feature)
> +{
> + u64 acked_features;
> + bool ret = false;
> +
> + mutex_lock(&vs->dev.mutex);
> + acked_features = vs->dev.acked_features;
> + if (acked_features & 1ULL << feature)
> + ret = true;
> + mutex_unlock(&vs->dev.mutex);
> +
> + return ret;
> +}
This is like vhost_has_feature() except it acquires dev.mutex?
In any case it isn't tcm_vhost-specific and could be in vhost.c.
Stefan
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