From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-fx0-f49.google.com ([209.85.161.49]) by canuck.infradead.org with esmtp (Exim 4.72 #1 (Red Hat Linux)) id 1P877w-0006nE-16 for linux-mtd@lists.infradead.org; Tue, 19 Oct 2010 08:00:56 +0000 Received: by fxm15 with SMTP id 15so1379804fxm.36 for ; Tue, 19 Oct 2010 01:00:54 -0700 (PDT) Subject: Re: [PATCH 2/2] UBIFS: add unstable pages problem description From: Artem Bityutskiy To: Matthieu CASTET In-Reply-To: <1287396125-1890-1-git-send-email-dedekind1@gmail.com> References: <1287396125-1890-1-git-send-email-dedekind1@gmail.com> Content-Type: text/plain; charset="UTF-8" Date: Tue, 19 Oct 2010 10:57:48 +0300 Message-ID: <1287475068.9272.8.camel@localhost> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Cc: linux-mtd@lists.infradead.org, Adrian Hunter Reply-To: dedekind1@gmail.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Mon, 2010-10-18 at 13:02 +0300, Artem Bityutskiy wrote: > From: Artem Bityutskiy > > Describe a problem reported by Matthieu CASTET which is currently > not handled by UBIFS. > > Signed-off-by: Artem Bityutskiy Matthiew, are you happy with this description? Does it properly reflect your findings? Could you please correct, if not? I'm starting working on your problem. Since I do not have much time, I'll do a little everyday, but hope to come up with some patches this week already. The thing is that it is a lot of work. We need to go through a lot of UBI/UBIFS subsystems and analyze them. Why a lot of work? Because we assumed everywhere we can rely on CRC - if it is correct, we are safe. However, according to you this is not reliable for unstable pages - you do not have guarantee that next time you read it you will get correct data. Also, I do not have HW to test this, so I expect you to help by testing, are your testing set-ups kept ready? :-) -- Best Regards, Artem Bityutskiy (Артём Битюцкий)