Re: More on write caching

[Andrew Morton <andrewm@xxxxxxxxxx>]

Jens Axboe wrote:
> 
> On Sat, Jul 07 2001, Andrew Morton wrote:
> > For more sophisticated storage systems such as RAID controllers,
> > I guess we'd have to propagate a SCSI write barrier command down to
> > the controller itself.  I'm not sure that the Linux request
> > and SCSI layers are up to doing that.  Have you looked into it?
> 
> I have, I wrote a barrier write patch some time ago. SCSI support is the
> easy part, having the luxury of just setting a tag option.

Good.  Please keep that patch warm.

Question is: does IDE need it at all?  If we can assume
that the data is safe once the drive has acked it, then that's
all a journalling fs cares about, yes?