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Re: More on write caching

To: Jens Axboe <axboe@xxxxxxx>
Subject: Re: More on write caching
From: Andrew Morton <andrewm@xxxxxxxxxx>
Date: Sat, 07 Jul 2001 21:22:13 +1000
Cc: Steve Lord <lord@xxxxxxx>, Andrew Klaassen <ak@xxxxxxx>, linux-xfs@xxxxxxxxxxx
References: <ak@xxxxxxx> <20010706130636.C2814@xxxxxxx> <200107061738.f66Hcpb09219@xxxxxxxxxxxxxxxxxxxx> <3B469DDF.905AEC0B@xxxxxxxxxx>, <3B469DDF.905AEC0B@xxxxxxxxxx> <20010707131328.F16505@xxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
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?

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