From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-36-i2.italiaonline.it ([212.48.25.210]:54104 "EHLO smtp-36.italiaonline.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932455AbaLDSck (ORCPT ); Thu, 4 Dec 2014 13:32:40 -0500 Message-ID: <5480A8C6.8010201@inwind.it> Date: Thu, 04 Dec 2014 19:32:38 +0100 From: Goffredo Baroncelli Reply-To: kreijack@inwind.it MIME-Version: 1.0 To: Shriramana Sharma , linux-btrfs CC: Hugo Mills Subject: Re: System/single + Metadata/single as leftover cruft of mkfs? References: In-Reply-To: Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 12/04/2014 02:53 PM, Shriramana Sharma wrote: > I observe that whenever I create a BtrFS instance using mkfs.btrfs, > there is always the leftover cruft of two System/Metadata-Single > allocation profiles: > > btrfs fi df /run/media/samjnaa/BRIHATII/ > Data, single: total=460.01GiB, used=458.47GiB > System, DUP: total=8.00MiB, used=80.00KiB > System, single: total=4.00MiB, used=0.00B > Metadata, DUP: total=1.50GiB, used=736.86MiB > Metadata, single: total=8.00MiB, used=0.00B > GlobalReserve, single: total=256.00MiB, used=0.00B Time, to time this question returns: this was a explanation from Hugo Mills http://permalink.gmane.org/gmane.comp.file-systems.btrfs/38205 : I believe it comes from mkfs creating a trivial basic filesystem : (with the single profiles), and then setting enough flags on it that the : kernel can bootstrap it with the desired chunks in it -- but I may be : wrong about that. > > Doing btrfs balance eventually removes these (but since I forgot to do > it *before* copying 400+ G of data to the drive it's still running) > but I don't understand why these have to be created in the first > place? (I just used SuSE Tumbleweed's default mkfs.btrfs without any > -m or -d options.) > -- gpg @keyserver.linux.it: Goffredo Baroncelli Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5