linux-kernel - Re: Re: BUG in kernel: Wrong Handling of USB HDD’s in scsiglue(slave_configure) and scsi/sd(sd_read_cache

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Message-ID: <Pine.LNX.4.44L0.1110031548310.1882-100000@iolanthe.rowland.org>
Date:	Mon, 3 Oct 2011 15:53:45 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Douglas Gilbert <dgilbert@...erlog.com>,
	Amit Sahrawat <amit.sahrawat83@...il.com>,
	<linux-usb@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: Re: BUG in kernel: Wrong Handling of USB HDD’s
 in scsiglue(slave_configure) and scsi/sd(sd_read_cache_type)

On Mon, 3 Oct 2011, James Bottomley wrote:

> On Mon, 2011-10-03 at 14:10 -0400, Alan Stern wrote:
> > > No. You need to also take into account the RBC
> > > device parameters mode page if present. See above.
> > 
> > All right, suppose neither page is present.  Does it then make sense to 
> > assume by default that write caching is enabled?
> 
> You're the USB expert ... if we do that, we'll start sending
> SYNCHRONIZE_CACHE commands down to a whole slew of devices we didn't
> before ... is that going to cause problems with any USB SATLs?

Hmmm...  Actually, I doubt it would bother any SATLs, but it might well
bother other sorts of USB translation layers.  No way to tell without
trying it, and I don't really want to deal with the fallout.

Maybe a better question to be asking is this: What happens when one of 
these drives (the ones that report their caching capabilities 
incorrectly) is plugged into a Windows system?

Alan Stern

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