Date: Tue, 31 Jan 2006 12:38:59 +0100 From: Florent Thoumie <flz@xbsd.org> To: Matthew Jacob <mj@feral.com> Cc: freebsd-scsi@freebsd.org, Nate Lawson <nate@root.org> Subject: Re: cvs commit: src/sys/cam/scsi scsi_da.c src/sys/dev/usb umass.c usbdevs Message-ID: <200601311239.10248.flz@xbsd.org> In-Reply-To: <20060130213338.H79194@ns1.feral.com> References: <20060130202806.DCC7916A4CA@hub.freebsd.org> <43DEF43A.6090804@root.org> <20060130213338.H79194@ns1.feral.com>
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On Tuesday 31 January 2006 06:33, Matthew Jacob wrote:
> >> Linux only sends the SYNCHRONIZE_CACHE command if the WCE (Write Cache
> >> Enable) bit of the disk is set. I can't seem to find something
> >> equivalent to this in our CAM framework. I have no particular SCSI
> >> knowledge but I guess I can have a look at this tomorrow.
> >>
> >> I'm forwarding this to freebsd-scsi@ (keep me CC'ed, as I'm not
> >> subscribed to this list, yet).
> >
> > Hmm, is WCE part of the inquiry response? [moving to scsi@ list]
>
> Yes.
Hum, reading Linux source and SCSI standard [1], I'm not so sure, but I mig=
ht=20
be wrong. We need to request the caching page in scsi_mode_sense_{6,10}.
I'll try to write something today, but I guess someone having already worke=
d=20
on scsi will only need 10 minutes to DTRT.
[1] http://www.danbbs.dk/~dino/SCSI/SCSI2-09.html (table 156)
=2D-=20
=46lorent Thoumie
flz@FreeBSD.org
=46reeBSD Committer
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