linux-kernel - Re: [RFC][PATCH] fs: configfs: programmatically create config groups

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Date:	Mon, 26 Nov 2012 18:54:06 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joel Becker <jlbec@...lplan.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RFC][PATCH] fs: configfs: programmatically create config groups

On Mon, Nov 26 2012, Sebastian Andrzej Siewior wrote:
> Wouldn't say that. It may adds complexity on another level. The target
> subsystem has the same problem with adding luns and there seems nothing
> wrong with having lun3 and 4 and leaving 0 and 1 unsued.

That's not what Wikipedia claims though (from
<http://en.wikipedia.org/wiki/Logical_Unit_Number>):

	LUN 0: There is one LUN which is required to exist in every
	target: zero. The logical unit with LUN zero is special in that
	it must implement a few specific commands, most notably Report
	LUNs, which is how an initiator can find out all the other LUNs
	in the target. But LUN zero need not provide any other services,
	such as a storage volume.

That's why I proposed solution where one needs to have continuous
numbering of LUNs.  I'm not an expert on SCSI though.

> With the tcm gadget I get:
>
> |scsi 0:0:0:2: Direct-Access     LIO-ORG  RAMDISK-MCP      4.0  PQ: 0 
> ANSI: 5
> |scsi 0:0:0:3: Direct-Access     LIO-ORG  FILEIO           4.0  PQ: 0 
> ANSI: 5
>
> You notice :2 and :3 instead :0 and :1. While should be there something
> wrong with this?

It may be that it works on Linux but fails on some other systems (or
even older Linux kernels).  Like I've said, I'm not SCSI expert, so my
knowledge of it is (embarrassingly) minimal.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@...gle.com>--------------ooO--(_)--Ooo--

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