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From: "Michał Nazarewicz" <m.nazarewicz@samsung.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	Andy Shevchenko <ext-andriy.shevchenko@nokia.com>,
	Denis Karpov <ext-denis.2.karpov@nokia.com>,
	Adrian Hunter <adrian.hunter@nokia.com>,
	Alan Stern <stern@rowland.harvard.edu>,
	David Brownell <dbrownell@users.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@suse.de>,
	linux-usb@vger.kernel.org
Subject: Re: [PATCHv2] usb: gadget: storage: optional SCSI WRITE FUA bit
Date: Wed, 14 Jul 2010 19:12:49 +0200	[thread overview]
Message-ID: <op.vfuffnzb7p4s8u@pikus> (raw)
In-Reply-To: <AANLkTilnIRCgyiSbLVbPubU38CSLwVan17GAHqNMX1Ir@mail.gmail.com>

> 2010/7/14 Michał Nazarewicz <m.nazarewicz@samsung.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@gmail.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).

-- 
Best regards,                                        _     _
| Humble Liege of Serenely Enlightened Majesty of  o' \,=./ `o
| Computer Science,  Michał "mina86" Nazarewicz       (o o)
+----[mina86*mina86.com]---[mina86*jabber.org]----ooO--(_)--Ooo--

  reply	other threads:[~2010-07-14 17:11 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-13  8:36 [PATCH] usb: gadget: storage: optional SCSI WRITE FUA bit Andy Shevchenko
2010-07-13 14:09 ` Alan Stern
2010-07-14  9:05   ` [PATCHv2] " Andy Shevchenko
2010-07-14 12:38     ` Michał Nazarewicz
2010-07-14 13:44       ` Andy Shevchenko
2010-07-14 13:55         ` Roger Quadros
2010-07-16  7:54           ` Felipe Balbi
2010-07-16  8:38             ` Roger Quadros
2010-07-14 14:24         ` Michał Nazarewicz
2010-07-14 15:05           ` Andy Shevchenko
2010-07-14 17:12             ` Michał Nazarewicz [this message]
2010-07-15  9:07           ` [PATCHv3 1/2] usb: gadget: storage: strict coversion of 'ro' parameter Andy Shevchenko
2010-07-15  9:07             ` [PATCHv3 2/2] usb: gadget: storage: optional SCSI WRITE FUA bit Andy Shevchenko
2010-07-21 19:17               ` Greg KH
2010-07-22  8:58                 ` [PATCHv4 1/2] usb: gadget: storage: strict coversion of 'ro' parameter Andy Shevchenko
2010-07-22  8:58                   ` [PATCHv4 2/2] usb: gadget: storage: optional SCSI WRITE FUA bit Andy Shevchenko
2010-07-22 14:13                     ` Alan Stern
2010-07-22 14:27                       ` Andy Shevchenko
2010-07-22 14:53                       ` [PATCHv5] " Andy Shevchenko
2010-07-22 14:07                   ` [PATCHv4 1/2] usb: gadget: storage: strict coversion of 'ro' parameter Alan Stern
2010-07-22 14:17                     ` Michał Nazarewicz
2010-07-21 19:17             ` [PATCHv3 " Greg KH

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