linux-kernel - Re: [PATCH 00/22 take 3] UBI: Unsorted Block Images

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Message-Id: <1174236579.17249.6.camel@sauron>
Date:	Sun, 18 Mar 2007 18:49:39 +0200
From:	Artem Bityutskiy <dedekind@...radead.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frank Haverkamp <haver@...t.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
Subject: Re: [PATCH 00/22 take 3] UBI: Unsorted Block Images

On Sun, 2007-03-18 at 11:27 -0500, Matt Mackall wrote:
> Forgive my ignorance, but why did you not implement the two features
> above as device mapper layers instead? A device mapper can arbitrarily
> transform I/O addresses and contents and has direct access to the
> mapped device's ioctl interfaces, etc.

Just because UBI is designed for flash devices, not block devices. Note,
UBI is not for MMC/USB stick/SC/etc flashes, which are used as block
devices, but for _bare_ flashes.

Please, glance here to find more information about the different between
flashes and block devices:

http://www.linux-mtd.infradead.org/faq/general.html#L_mtd_vs_hdd

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

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