From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38479C25B45 for ; Mon, 23 Oct 2023 17:56:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230232AbjJWR40 (ORCPT ); Mon, 23 Oct 2023 13:56:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46130 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229529AbjJWR4Y (ORCPT ); Mon, 23 Oct 2023 13:56:24 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F715B7 for ; Mon, 23 Oct 2023 10:56:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=oJVPRZEoBC/c2HR/LZKIuQwh+jWlvEXVTr92xS5oVOY=; b=eSQsea146+2U3G4TAYQK8cuKQw eQ7II5eHr17Acoro6C8ijJfa97RX/UroHfNmSIdSGAzakfOhzo/Rz1TlzJI9iKZvxtpd61YxE0ecg Qz7NkRDhOdXLayWC51+fuZFblslPK8dnQRNygmTsABttSB380gP1uU9iUOlDVr0fylJ628ahzufGT uiwQZQoDPgn84orChrvtUCLi2I6esO6iBfegh1i847WabkhepFzVslh0SEZWkMoLCnzsJDs7M2E40 yk/wc7NRQOyZWZXulen5FXx3MDZsxZ1gxa1JldMjBPvnW/sgFNipP/p/5j5XscuvfN8TGpFD8Btd9 ZJ0AjvDA==; Received: from [2001:8b0:10b:5:545e:5208:5de0:9d33] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1quz9i-00FC2M-Mi; Mon, 23 Oct 2023 17:55:58 +0000 Message-ID: Subject: Re: [PATCH v1 2/2] jffs2: make cleanmarker support option From: David Woodhouse To: Martin Kurbanov , Richard Weinberger Cc: Christian Brauner , Dave Chinner , Yu Zhe , linux-kernel , linux-mtd , kernel@sberdevices.ru Date: Mon, 23 Oct 2023 18:55:57 +0100 In-Reply-To: <3951ac21-a0a4-47b5-be94-edb0140c69a5@salutedevices.com> References: <20231019073838.17586-1-mmkurbanov@salutedevices.com> <20231019073838.17586-3-mmkurbanov@salutedevices.com> <1258129392.18842.1697703134703.JavaMail.zimbra@nod.at> <3951ac21-a0a4-47b5-be94-edb0140c69a5@salutedevices.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-nqpevilyoVuG9vHwJ+kC" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-nqpevilyoVuG9vHwJ+kC Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-10-23 at 17:54 +0300, Martin Kurbanov wrote: > Hello Richard, >=20 > On 19.10.2023 11:12, Richard Weinberger wrote: > > > This patch support for disable cleanmarker option. This is useful on > > > some NAND devices which entire OOB area is protected by ECC. Problem > > > fires when JFFS2 driver writes cleanmarker to some page and later it > > > tries to write to this page - write will be done successfully, but af= ter > > > that such page becomes unreadable due to invalid ECC codes. This occu= rs > > > because the second write necessitates an update to ECC, but it is > > > impossible to do it correctly without block erase. > > Hmm, I miss an explanation why this change is correct and safe. > > You explain why the OOB area can't be used, okay. But you need to > > add more details on why you change is safe in terms of filesystem > > consistency. > =C2=A0 > If you disable the cleanmarker, the found clean block (filled with 0xff) > will be erased again (see fs/jffs2/scan.c#L162). > In my opinion, it is better to perform the block erasure again than to > not work with such a nand flash at all. Erasing all unused blocks over and over again on every reboot/remount is going to destroy your flash quite quickly, surely? I think you need to come up with a way to log the clean blocks (or erase requests) in the JFFS2 log itself. Perhaps a 'block erase log' node type, which just contains a version# and a list of blocks which are currently being erased. You write it out before doing any erase operation. And then at *some* point after the erase completes (it doesn't need to be immediate) you write out a new one (which may be empty, or may list new blocks which are about to be erased). On mount, we just need to re-erase any blocks which are indicated as being erased in the latest erase log node. > > Beside of that, I don't think this should be kernel config option. > > Why not a mount option? >=20 > Agreed Why even a mount option? 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