linux-kernel - Re: [PATCHv2] usb: gadget: storage: optional SCSI WRITE FUA bit

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Date:	Wed, 14 Jul 2010 19:12:49 +0200
From:	Michał Nazarewicz <m.nazarewicz@...sung.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Andy Shevchenko <ext-andriy.shevchenko@...ia.com>,
	Denis Karpov <ext-denis.2.karpov@...ia.com>,
	Adrian Hunter <adrian.hunter@...ia.com>,
	Alan Stern <stern@...land.harvard.edu>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org
Subject: Re: [PATCHv2] usb: gadget: storage: optional SCSI WRITE FUA bit

> 2010/7/14 Michał Nazarewicz <m.nazarewicz@...sung.com>:
>> Ah, OK, I see why this is per LUN.  You want to be able not to ignore
>> FUA if the backing storage is a removable media, right?

On Wed, 14 Jul 2010 17:05:07 +0200, Andy Shevchenko <andy.shevchenko@...il.com> wrote:
> In instance, or vise versa.

I actually see the most sense in disabling FUA on devices with their
own power supply for logical units which backing file is not (on) a
removable device unless the removable device has some kind of lock
(like CD-ROM's door).

Either way, I now see the point of having this option per-LUN.

>>> Actually fua = 1 means ignorance of that flag.

>> ignore_fua would be better name then I think.  This also stands for
>> module parameter.

Or even “nofua”.  The other solution would be to change the meaning
to the opposite (1 meaning that FUA is not ignored).

-- 
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