linux-kernel - Re: [PATCH repost 3] [SCSI] Retrieve the Caching mode page

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Message-ID: <20101124144811.GA29196@infradead.org>
Date:	Wed, 24 Nov 2010 09:48:11 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	James Bottomley <James.Bottomley@...e.de>
Cc:	ltuikov@...oo.com,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-usb@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: Re: [PATCH repost 3] [SCSI] Retrieve the Caching mode page

On Wed, Nov 24, 2010 at 10:10:29AM +0000, James Bottomley wrote:
> The final question is is it worth it?  Since USB devices are supposed to
> be hot unpluggable, surely a USB device with a write back cache would be
> a disaster: no-one will SYNC the cache on a surprise unplug anyway ...
> therefore there shouldn't really be any of them surviving in the wild
> (famous last words, I suppose).

There's tons of USB devices with writeback caches.  Recent windows
version tend to use the FUA bit a lot because of this.  And the linux
usb storage target implementation thus has a hook to ignore the FUA bit,
and it's probably not the only one..

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