From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-02.dd24.net ([193.46.215.43]:55554 "EHLO mailgw-02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750764AbcABFMu (ORCPT ); Sat, 2 Jan 2016 00:12:50 -0500 Message-ID: <1451711566.8761.31.camel@scientia.net> Subject: Re: Btrfs Check - "type mismatch with chunk" From: Christoph Anton Mitterer To: Duncan <1i5t5.duncan@cox.net>, linux-btrfs@vger.kernel.org Date: Sat, 02 Jan 2016 06:12:46 +0100 In-Reply-To: References: <9871.1451021289@ccs.covici.com> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-QILfNKUJuMd4ibtq0Y7t" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-QILfNKUJuMd4ibtq0Y7t Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-12-25 at 08:06 +0000, Duncan wrote: > I wasn't personally sure if 4.1 itself was affected or not, but the > wiki=C2=A0 > says don't use 4.1.1 as it's broken with this bug, with the quick-fix=20 > in=C2=A0 > 4.1.2, so I /think/ 4.1 itself is fine.=C2=A0=C2=A0A scan with a current = btrfs=C2=A0 > check should tell you for sure.=C2=A0=C2=A0But if you meant 4.1.1 and onl= y > typed=C2=A0 > 4.1, then yes, better redo. What exactly was that bug in 4.1.1 mkfs and how would one notice that one suffers from it? I created a number of personal filesystems that I use "productively" and I'm not 100% sure during which version I've created them... :/ Is there some easy way to find out, like a fs creation time stamp?? > Unfortunately, the > btrfs- > convert bug isn't as nailed down, but btrfs-convert has a warning up > on=C2=A0 > the wiki anyway, as currently being buggy and not reliable. I hope I don't step on anyone's toes who puts efforts into this, but in all doing respect,... I think the whole convert thing is at least in parts a waste of manpower - or perhaps better said: it would be nice to have, but given the lack of manpower at btrfs development and the numerous areas[0] that would need some urgent and probably lots of care,... having a convert from other fs to btrfs seems like luxury that isn't really needed. People don't choose btrfs because they can easy convert, I'd guess. Either they'll choose it (at some time in the future), because it's the default in distros then,... or they choose it already nowadays because it's already pretty great and has awesome features. The conversion is always a think, which at best works and doesn't make things worse[1],... in practise though it's rather likely to fail than to work, because the convert tools would need to keep up with developments at both side (btrfs and e.g. ext) forever. If people want to change their fs, they should simply copy the data from on to the other. Saves a lot of time for the devs :-) Cheers, Chris. [0] From the really awful things like the UUID collision->corruption issues,... over the pretty serious things like all the missing RAID functionality (just look at the recent reports at the list where even RAID1 seems to be far from production ready, not to talk about 5/6),... and many other bugs (like all the recent error reports about non working scrubs, etc.)... to the really strongly desired wishlist- features [1] It's kinda like the situation when many photographers think it makes sense to convert their XYZ RAW format to DNG, which is IMHO inherently stupid. At best all information from XYZ would be preserved (which is however unlikely) at worst you loose information. And since there are good readers (dcraw) for basically all RAW formats there's really not much need to convert it to DNG. 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