linux-kernel - Re: [PATCH RESEND 0/3] scsi: fix internal write cache issue on usb hdd.

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Date:	Tue, 17 Jul 2012 08:19:14 +0100
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Namjae Jeon <linkinjeon@...il.com>, mdharm-usb@...-eyed-alien.net,
	stern@...land.harvard.edu, sshtylyov@...sta.com,
	bvanassche@....org, akpm@...ux-foundation.org,
	linux-usb@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH RESEND 0/3] scsi: fix internal write cache issue on usb
 hdd.

On Mon, 2012-07-16 at 16:48 -0700, Greg KH wrote:
> On Sat, Jul 07, 2012 at 11:04:45PM -0400, Namjae Jeon wrote:
> > From: Namjae Jeon <namjae.jeon@...sung.com>
> > 
> > The numbers of USB HDDs(All USB HDD I checked) does not respond
> > correctly to scsi mode sense command for retrieving the write cache
> > page status. Even though write cache is enabled by default, due to
> > scsi driver assume that cache is not enabled which in turn might lead
> > to loss of data since data still will be in cache.
> > This result that all filesystems is not stable on USB HDD when the
> > device is unplugged abruptly, even though these are having journaling
> > feature. Our first trying is that scsi driver send ATA command
> > (ATA Pass through, #85) to USB HDD after failure from normal routine to
> > know write cache enable.
> > We have known it is dangerous after testing several USB HDD. some of
> > HDD is stalled by this command(A-DATA HDD). So we tried to make the
> > patch James Bottomley's suggestion(usb quirk) on version 2 that add
> > product ID and verdor ID of USB HDD to USB quirk list after checking
> > write cache.
> > All filesystem will be stable on USB HDD registered in quirk list.
> > And it will be updated continuously.
> 
> Now applied to the usb-next branch.

It's been in scsi#misc for ten days with no problems.  Lets leave it
there rather than create merge and rebase issues.

Thanks,

James


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