linux-kernel - Re: [PATCHv3 2/2] usb: gadget: storage: optional SCSI WRITE FUA bit

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Message-ID: <20100721191711.GA28893@kroah.com>
Date:	Wed, 21 Jul 2010 12:17:11 -0700
From:	Greg KH <greg@...ah.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: [PATCHv3 2/2] usb: gadget: storage: optional SCSI WRITE FUA bit

On Thu, Jul 15, 2010 at 12:07:21PM +0300, Andy Shevchenko wrote:
> MS Windows mounts removable storage in "Removal optimized mode" by
> default. All the writes to the media are synchronous which is achieved
> by setting FUA (Force Unit Access) bit in SCSI WRITE(10,12) commands.
> This prevents I/O requests aggregation in block layer dramatically
> decreasing performance.
> 
> This patch brings an option to accept or ignore mentioned bit
>  a) via specifying module parameter "nofua", or
>  b) through sysfs entry
> 	/sys/devices/platform/musb_hdrc/gadget/gadget-lun-N/nofua

Any new sysfs entry needs a matching documentation entry in the
Documentation/ABI/ directory.

Care to resend these two patches, with that documentation change added
as well?

thanks,

greg k-h
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