From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.fusionio.com ([66.114.96.31]:44776 "EHLO mx2.fusionio.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932791Ab2ISSC1 (ORCPT ); Wed, 19 Sep 2012 14:02:27 -0400 Date: Wed, 19 Sep 2012 14:02:24 -0400 From: Josef Bacik To: =?iso-8859-1?Q?Sw=E2mi?= Petaramesh CC: Josef Bacik , Linux Btrfs Subject: Re: "free space cache generation" ? Message-ID: <20120919180224.GE2272@localhost.localdomain> References: <50597CD5.5060001@petaramesh.org> <20120919160109.GC2272@localhost.localdomain> <505A013F.8000303@petaramesh.org> <20120919173628.GD2272@localhost.localdomain> <505A06DE.1050503@petaramesh.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" In-Reply-To: <505A06DE.1050503@petaramesh.org> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Wed, Sep 19, 2012 at 11:54:38AM -0600, Swâmi Petaramesh wrote: > Le 19/09/2012 19:36, Josef Bacik a écrit : > > It can happen for all sorts of different reasons. Did you have a > > unclean unmount at some point? > > Not that I'm aware of... > > > Do you have a particularly full file system? > > ~1 TB FS, 23% full... > > Only, I have several Linux distros installed on the same BTRFS - in > different subvols - so I sometimes mount it with a 3.5.x kernel, and > more rarely - but sometimes - with a 3.2.x... > Well I think I changed the space cache format between those releases which would cause them all to be discarded and remade. > => Also I have to mention that I have lost a complete BTRFS FS, that was > a /boot with snapshots. At some point it started to fail mounting, the > kernel complaining that some trees (corresponding to removed snapshots > as far as I could tell) were b0rked, and btrfsck couldn't help... > > So I lost the FS - and lost quite a bit of confidence into BTRFS the > same day... :-\ > Yes well, welcome to using an experimental file system. Josef