linux-kernel - Re: 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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Date:	Tue, 4 Oct 2011 10:10:30 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Amit Sahrawat <amit.sahrawat83@...il.com>
cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Douglas Gilbert <dgilbert@...erlog.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: Re: BUG in kernel: Wrong Handling of USB HDD’s in scsiglue(slave_configure) and scsi/sd(sd_read_cache_type)

On Tue, 4 Oct 2011, Amit Sahrawat wrote:

> Not able to get tools which can show the Caching Information when
> connected USB device to Windows 7(Except one option which allows for
> optimizing Performance by enabling/disabling Cache - But that option
> is available for all the Mass storage device) - Please let me know if
> there is option to view this.

I have no idea.

> So, I have collected USB analyzer logs for Device after connected to
> Windows 7.  Please find the attached logs.

It would be more informative if your logs did not show the initial
connection, but did show what happens when you write a small file to
the drive and then go through the "Safely Remove Hardware" procedure.

The real question is whether or not Windows sends a SYNCHRONIZE CACHE 
command to the drive.

Alan Stern

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