From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f180.google.com ([209.85.223.180]:32916 "EHLO mail-io0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161341AbbKTNwj (ORCPT ); Fri, 20 Nov 2015 08:52:39 -0500 Received: by iouu10 with SMTP id u10so125758370iou.0 for ; Fri, 20 Nov 2015 05:52:39 -0800 (PST) Subject: Re: Kernel 3.19 and still "disk full" even though 'btrfs fi df" reports enough room left? To: Hugo Mills , Dmitry Katsubo , linux-btrfs@vger.kernel.org References: <564CC90F.3060703@gmail.com> <20151118190857.GY24333@carfax.org.uk> <564D1AE5.3000700@cn.fujitsu.com> <564F0671.8060402@mail.ru> <564F1E5B.6040004@gmail.com> <20151120132714.GK24333@carfax.org.uk> From: Austin S Hemmelgarn Message-ID: <564F2599.6050802@gmail.com> Date: Fri, 20 Nov 2015 08:52:25 -0500 MIME-Version: 1.0 In-Reply-To: <20151120132714.GK24333@carfax.org.uk> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms060607080005090402010904" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms060607080005090402010904 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-11-20 08:27, Hugo Mills wrote: > On Fri, Nov 20, 2015 at 08:21:31AM -0500, Austin S Hemmelgarn wrote: >> On 2015-11-20 06:39, Dmitry Katsubo wrote: >>> If I may add: >>> >>> Information for "System" >>> >>> System, DUP: total=3D32.00MiB, used=3D16.00KiB >>> >>> is also quite technical, as for end user system =3D metadata (one can= call >>> it "filesystem metadata" perhaps). For simplicity the numbers can be >>> added to "Metadata" thus eliminating that line as well. >>> >>> For those power users who really want to see the tiny details like >>> "System" and "GlobalReserve" I suggest to implement "-v" flag: >>> >>> # btrfs fi usage -v >> Actually, I really like this idea, one of the questions I get asked >> when I show people BTRFS is the difference between System and >> Metadata, and it's not always easy to explain to somebody who >> doesn't have a background in filesystem development. For some >> reason, people seem to have trouble with the concept that the system >> tree is an index of the other trees. > > Actually, it's not that in the system chunks. :) > > System chunks contain the chunk tree, not the tree of tree roots. > They're special (and small) because they're listed explicitly by devid > and physical offset at the end of the superblock, and allow the FS to > read them first so that it can bootstrap the logical:physical mapping > table before it starts reading all the other metadata like the tree of > tree roots (which is "normal" metadata). I guess my understanding was wrong then. 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