linux-kernel - Re: [PATCH V2] UBI: power cut emulation for testing

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Message-ID: <20150405202559.GA3500@amd>
Date:	Sun, 5 Apr 2015 22:25:59 +0200
From:	Pavel Machek <pavel@....cz>
To:	Richard Weinberger <richard@....at>
Cc:	david.oberhollenzer@...ma-star.at,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] UBI: power cut emulation for testing

On Sun 2015-04-05 22:09:27, Richard Weinberger wrote:
> Am 05.04.2015 um 22:04 schrieb Pavel Machek:
> > On Sun 2015-04-05 21:49:27, Richard Weinberger wrote:
> >> On Sun, Apr 5, 2015 at 9:31 PM, Pavel Machek <pavel@....cz> wrote:
> >>> On Thu 2015-03-26 23:59:50, david.oberhollenzer@...ma-star.at wrote:
> >>>> Emulate random power cuts by switching device to ro after a number of
> >>>> writes to allow simple power cut testing with nand-sim.
> >>>>
> >>>> Maximum and minimum number of successful writes before power cut and
> >>>> what kind of writes (EC header, VID header or none) to interrupt
> >>>> configurable via debugfs.
> >>>>
> >>>> Signed-off-by: David Oberhollenzer <david.oberhollenzer@...ma-star.at>
> >>>> ---
> >>>> V2: Remove broken check to prevent multiple triggering
> >>>
> >>> Does NAND always finish write of full block during powerfail?
> >>
> >> Not sure if I correctly understand your question.
> >> Unless you don't have special hardware a write can be interrupted and
> >> can cause problems.
> > 
> > But this only emulates fail after a full block written, no?
> 
> Emulating all aspects of real hardware is almost impossible.

I guess so. So maybe warning in the documentation somewhere that real
hardware is nastier than designed-to-be-nasty emulation would be
nice..?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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