From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from 220-245-31-42.static.tpgi.com.au ([220.245.31.42]:59278 "EHLO smtp.sws.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750891Ab2L2DOq (ORCPT ); Fri, 28 Dec 2012 22:14:46 -0500 From: Russell Coker Reply-To: russell@coker.com.au To: Chris Murphy Subject: Re: corrupt filesystem after snapshots on 3.2 Date: Sat, 29 Dec 2012 14:14:35 +1100 Cc: linux-btrfs@vger.kernel.org References: <201212291031.44745.russell+btrfs@coker.com.au> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Message-Id: <201212291414.37552.russell@coker.com.au> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Sat, 29 Dec 2012, Chris Murphy wrote: > Add another disk, or disk partition, to the Btrfs volume. That'll give it > more space and hopefully you can back out at that point. # df -h /mnt/tmp Filesystem Size Used Avail Use% Mounted on /dev/mapper/rjca-crypt 12G 12G 637M 95% /mnt/tmp I didn't expect that to work because the filesystem already reported free space. I removed the snapshots and had problems during/after the removal so it seemed that there was space. # btrfs filesystem show --all-devices Label: none uuid: 0f0b48e9-d2f7-4280-b417-4d1f5a933975 Total devices 3 FS bytes used 5.63GB devid 1 size 6.00GB used 6.00GB path /dev/dm-16 devid 2 size 6.00GB used 6.00GB path /dev/dm-17 devid 3 size 6.00GB used 19.00MB path /dev/dm-18 However I've added another device and now "du -h" completes without any kernel panic (a major improvement). Now I'm seeing the above, apparently 19MB used on the new dm-18 device seems to be making all the difference. # btrfs subvol list /mnt/tmp ERROR: Failed to lookup path for root 0 - No such file or directory Strangely I was getting the above error while the btrfs scrub was in progress, but it went away when the scrub finished. That seems like a bug to me. Now the filesystem is now OK and I've copied all the data off it. The data appears to be all intact (much of it could be verified against another system). -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/