From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-02.dd24.net ([193.46.215.43]:39262 "EHLO mailgw-02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753112AbcIOVXG (ORCPT ); Thu, 15 Sep 2016 17:23:06 -0400 Received: from mailpolicy-01.live.igb.homer.key-systems.net (mailpolicy-02.live.igb.homer.key-systems.net [192.168.1.27]) by mailgw-02.dd24.net (Postfix) with ESMTP id D8C795FC80 for ; Thu, 15 Sep 2016 21:23:03 +0000 (UTC) Received: from mailgw-02.dd24.net ([192.168.1.36]) by mailpolicy-01.live.igb.homer.key-systems.net (mailpolicy-02.live.igb.homer.key-systems.net [192.168.1.25]) (amavisd-new, port 10236) with ESMTP id L4sv-BOlLk9i for ; Thu, 15 Sep 2016 21:23:01 +0000 (UTC) Received: from heisenberg.fritz.box (ppp-46-244-200-251.dynamic.mnet-online.de [46.244.200.251]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailgw-02.dd24.net (Postfix) with ESMTPSA for ; Thu, 15 Sep 2016 21:23:01 +0000 (UTC) Message-ID: <1473974581.6678.53.camel@scientia.net> Subject: Re: Is stability a joke? (wiki updated) From: Christoph Anton Mitterer To: linux-btrfs@vger.kernel.org Date: Thu, 15 Sep 2016 23:23:01 +0200 In-Reply-To: <24d64f38-f036-3ae9-71fd-0c626cfbb52c@gmail.com> References: <57D51BF9.2010907@online.no> <20160912142714.GE16983@twin.jikos.cz> <20160912162747.GF16983@twin.jikos.cz> <8df2691f-94c1-61de-881f-075682d4a28d@gmail.com> <1ef8e6db-89a1-6639-cd9a-4e81590456c5@gmail.com> <24d64f38-f036-3ae9-71fd-0c626cfbb52c@gmail.com> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-vdR/kJy5fEXGe9q8st6v" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-vdR/kJy5fEXGe9q8st6v Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2016-09-15 at 14:20 -0400, Austin S. Hemmelgarn wrote: > 3. Fsck should be needed only for un-mountable filesystems.=C2=A0=C2=A0Id= eally, > we=C2=A0 > should be handling things like Windows does.=C2=A0=C2=A0Preform slightly > better=C2=A0 > checking when reading data, and if we see an error, flag the > filesystem=C2=A0 > for expensive repair on the next mount. That philosophy also has some drawbacks: - The user doesn't directly that anything went wrong. Thus errors may even continue to accumulate and getting much worse if the fs would have immediately gone ro and giving the user the chance to manually intervene (possibly then with help from upstream). - Any smart auto-magical=E2=84=A2 repair may also just fail (and make thing= s worse, as the current --repair e.g. may). Not performing such auto- repair, gives the user at least the possible chance to make a bitwise copy of the whole fs, before trying any rescue operations. This wouldn't be the case, if the user never noticed that something happen, and the fs tries to repair things right at mounting. So I think any such auto-repair should be used with extreme caution and only in those cases where one is absolutely a 100% sure that the action will help and just do good. 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