linux-kernel - Re: [RFC/PATCH 5/5] mtd: ubi: Add sysfs entry to force all pebs' scan

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Message-ID: <5427CCA4.6060909@codeaurora.org>
Date:	Sun, 28 Sep 2014 11:53:56 +0300
From:	Tanya Brokhman <tlinder@...eaurora.org>
To:	Richard Weinberger <richard.weinberger@...il.com>
CC:	Artem Bityutskiy <dedekind1@...il.com>,
	linux-arm-msm@...r.kernel.org,
	Pratibhasagar V <pratibha@...eaurora.org>,
	open list <linux-kernel@...r.kernel.org>, dedeking1@...il.com,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [RFC/PATCH 5/5] mtd: ubi: Add sysfs entry to force all pebs'
 scan

On 9/28/2014 11:42 AM, Richard Weinberger wrote:
> Tanya,
>
> On Sun, Sep 28, 2014 at 8:38 AM, Tanya Brokhman <tlinder@...eaurora.org> wrote:
>> A given eraseblock can be read many times or not at all.
>> We do not have the account of such eraseblocks that have
>> not been accessed since a pre-defined threshold interval.
>> By means of scanning the entire flash device it is possible to identify
>> all such eraseblocks.
>>
>> Add a sysfs entry to force scan on all the PEBs on demand basis.
>>
>> The sysfs entry would be available under /sys/class/ubi/ubiX/peb_scan
>>   - echo 1 to this entry would trigger the scan, ignored if in progress
>>   - On reading returns the scan status (1 = Scan executing, 0 = Scan not
>>     executing)
>
> Did you see that?
> http://linux-kernel.2935.n7.nabble.com/RFC-UBI-bitrot-checking-td949453.html
> Maybe we can combine our work.
> Although your patch seems to be in better shape than mine. :)

oh, I'm sorry, missed that (its new :) )
this patch was tested thoroughly and working. I would appreciate if you 
could review this patch and perhaps we could improve it if required.


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