linux-kernel - Re: UBI fastmap updates

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Message-ID: <1341052998.2115.3.camel@koala>
Date:	Sat, 30 Jun 2012 13:43:18 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	linux-mtd@...ts.infradead.org, nyoushchenko@...sta.com,
	artem.bityutskiy@...ux.intel.com, linux-kernel@...r.kernel.org,
	adrian.hunter@...el.com, Heinz.Egger@...utronix.de,
	thomas.wucher@...utronix.de, shmulik.ladkani@...il.com,
	tglx@...utronix.de, Marius.Mazarel@...l.ro, tim.bird@...sony.com
Subject: Re: UBI fastmap updates

On Fri, 2012-06-29 at 17:14 +0200, Richard Weinberger wrote:
> This is the next round of UBI fastmap updates.
> 
> Fastmap is now disabled by default.
> If you attach an image it will not automatically convert it
> to the fastmap format.
> UBI has a new module parameter "fm_auto".
> If set to 1 UBI will create a fastmap automatically on your
> flash device.
> Please see commit "Add a module parameter to enable fastmap"
> for more details.

One thing I've noticed is that you use vmalloc for some of the buffers
you do I/O on (fm_raw). This is a problem for many ARM platforms because
they cannot do DMA on such buffers. The drivers have to implement
various workarouns for this: either fall back to memcopies or do an
extra copy to a DMA-able buffers.

UBI and UBIFS already to I/O on vmalloc'ed buffers, an I am planning to
fix this, which is not easy. Would be great to not add more of these.

-- 
Best Regards,
Artem Bityutskiy

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