Re: [PATCH] tcm_vhost: Expose ABI version via VHOST_SCSI_GET_ABI_VERSION

On Thu, 2012-07-26 at 11:58 +0300, Avi Kivity wrote:

On 07/26/2012 05:34 AM, Nicholas A. Bellinger wrote:

quoted

In that case, respinning a -v5 for tcm_vhost to start from ABI=0 and
will post an updated patch shortly.

quoted

The main thing I would like to confirm is that this only versions the
tcm_vhost ioctls?  In that case a single version number works.

Correct, the GET_ABI_VERSION call is only intended to identify the
changing of tcm_vhost ioctls.

Why use version numbers at all?

This was a request by QEMU folks.. 

Feature maps are better, because you can get very fine granularity.

Example..?  If there is a better way to handle ioctl compat I'd
certainly like to hear about it.