From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 193E3C35249 for ; Sun, 2 Feb 2020 00:00:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEA3F20679 for ; Sun, 2 Feb 2020 00:00:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="La4YUiFf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726712AbgBBAAn (ORCPT ); Sat, 1 Feb 2020 19:00:43 -0500 Received: from mout.gmx.net ([212.227.15.15]:46267 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726530AbgBBAAm (ORCPT ); Sat, 1 Feb 2020 19:00:42 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1580601640; bh=rbxfVLUrLCAGc+Wu+hkLWMU8iT4GUT6RxQ50vYu3BJM=; h=X-UI-Sender-Class:Subject:To:References:From:Date:In-Reply-To; b=La4YUiFfc8h5AL5+jztPJgRE2fTY+3lnCG0RL7Rymdgnj4CWplf8SWljm5Mqtw9hF FqkFCK+QIZILqxQ2bju9cyucKNTpbDTgaY3Bi61dH3wOMZr+mKkQDueI4wLq5cjU/z NJ9Ch5g0QnJBw0EP6rnlyTRd2ExdTyer4kSDoOSI= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [0.0.0.0] ([149.28.201.231]) by mail.gmx.com (mrgmx005 [212.227.17.184]) with ESMTPSA (Nemesis) id 1M89Gj-1itLrf0gUd-005Hs4; Sun, 02 Feb 2020 01:00:40 +0100 Subject: Re: btrfs wrongly reports 0 space available in 5.4.15 To: Marc Lehmann , linux-btrfs@vger.kernel.org References: <20200201204031.GA4203@schmorp.de> From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; prefer-encrypt=mutual; keydata= mQENBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAG0IlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT6JAU4EEwEIADgCGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1oQAKCRDC PZHzoSX+qCY6CACd+mWu3okGwRKXju6bou+7VkqCaHTdyXwWFTsr+/0ly5nUdDtT3yEVggPJ 3VP70wjlrxUjNjFb6iIvGYxiPOrop1NGwGYvQktgRhaIhALG6rPoSSAhGNjwGVRw0km0PlIN D29BTj/lYEk+jVM1YL0QLgAE1AI3krihg/lp/fQT53wLhR8YZIF8ETXbClQG1vJ0cllPuEEv efKxRyiTSjB+PsozSvYWhXsPeJ+KKjFen7ebE5reQTPFzSHctCdPnoR/4jSPlnTlnEvLeqcD ZTuKfQe1gWrPeevQzgCtgBF/WjIOeJs41klnYzC3DymuQlmFubss0jShLOW8eSOOWhLRuQEN BFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcgaCbPEwhLj 1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj/IrRUUka 68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fNGSsRb+pK EKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0q1eW4Jrv 0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEvABEBAAGJ ATwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1rgUJCWpOfwAKCRDCPZHz oSX+qFcEB/95cs8cM1OQdE/GgOfCGxwgckMeWyzOR7bkAWW0lDVp2hpgJuxBW/gyfmtBnUai fnggx3EE3ev8HTysZU9q0h+TJwwJKGv6sUc8qcTGFDtavnnl+r6xDUY7A6GvXEsSoCEEynby 72byGeSovfq/4AWGNPBG1L61Exl+gbqfvbECP3ziXnob009+z9I4qXodHSYINfAkZkA523JG ap12LndJeLk3gfWNZfXEWyGnuciRGbqESkhIRav8ootsCIops/SqXm0/k+Kcl4gGUO/iD/T5 oagaDh0QtOd8RWSMwLxwn8uIhpH84Q4X1LadJ5NCgGa6xPP5qqRuiC+9gZqbq4Nj Message-ID: Date: Sun, 2 Feb 2020 08:00:37 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.2 MIME-Version: 1.0 In-Reply-To: <20200201204031.GA4203@schmorp.de> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Vk4y9i4wrZRl1UwV4vYE8mtzPGt0B4Z9H" X-Provags-ID: V03:K1:fm3qubsDC7JxdQHhwn50gIdSyxlFoXOuKLiyVANn6L399RIC2we kxks+zP6cWeQuJok+Dy8SPaT1AsIyP8WehBjh6HTwWBYSfQBK/uhU1FA4UVg87PAk6mGYrE 9TeNgbwBw/hPfv9vBgFFyXibGNtZvsSX1PVMRzHNTODDAAHabh6YwXsk36sun36bHMqvKNX 9OTHspwzMCAwS2HSCkwWw== X-UI-Out-Filterresults: notjunk:1;V03:K0:eEfgJRCfQ9Q=:jr/i+2XL7vFWL0MKEEOwlD IHj+mxKWZbqmmHZgiAI09L+DDb5yXfKu8+Ts4e0GNNvr3+g5Nx+U1UpcufFQMphoZ0QIk2eW+ 4rpIGDYnDS6waHOJysUryxnHGhL869s3My+s/t8fOXvuIduFRR/zl1HqOjRrJ+iKwAbPK/dUC wwZCjs+0sGigijYRfz1utPIkg69BOOQBBrLpsZJoIG75Ltvp8TO6GqiqHYNtwGtGblqs/teXm qpW1knNSCOVC8/sbBjbzIo4FhmzBFh+ZEAiMc7bYNqlfha9iRE/+rptL4S+Mp9upKvztcmWca Hi0G7QtZFHp/q8SBPRKLqASBHnq/eMsJRFQXlJjv6dKe8bf8QkJKmJZCSud89QFWYr2K7sAMg t9etG2Fyeuo1OtTAp4ucyu0pxkayzQ97cDtg+Iio3PaJo6xkspryGf6pfocv+XjoLGgEnamlb b5XM3sGprjGVugRajwzoLVgEc/rCJSsKHUon13y4sk7zCPuVRlGtxr3AdN5/NNB/SQCHE4fFL c7ZygKv6knT1FqPyNBX+xtU1r5a1IPgk80TXrDXawc9/2Zhz2cMIja4GYC8Stn5x+/S5O0lee LgVAwr5YQg8H3Zlgd4xwr7Fgbw67JSm1ugihqHc6k20ZSs7uCp+sQ7g3ythnn5eMcrmTdbUKZ 8ujqyCDzkencSWxOjHeRQoNnjrWdOX6+7TCl1IH42yaevv6+yQByW7qDZv7b65QmeUqAbYaMF B/MIfocRheX4jP6pluRAEwPRcyDdlROovrGukhvDQqrQID9yK4Gs77zfHbTArf7cVr2jUURzx he6dEtx1a1SGdsSLqerM5IIAzyLbXE2jIc5H3ashAgcfKSN37sjvqqqeXmyrLCiCHeudAb20c 8Q/HyrHisfK6PIC1E6NEvV51YHIZYHt94RjEqmTioap/gCszbUgdKz2ULrJrUCc3RkSpSFPJ0 +2u69Vi+W8/0W/FduajFgpL8B4vWWb4887vZrjNRVn4btQZyxZSkWaL7v4TIeRB9pbEMsZ05K 41EwwA3Ua1+n9uUZSH2km1RIfvgRCm+9I3/J1u2BOYVPdu4neF0fsTwCh/yyhKcl2ETB77Db/ CH31bIPEAaXoFBD0Q0YWhxAOufPUPoYahoRdiZWKjwbPdCV22K34pVEYlIuRzmAJgO+T/W5z2 vEcHmC0d3oWSuaBwGMqZPlRAX2JZT6pE0IXA2B9Ze5//9D7I/7eDC6HBELjb4ysuznLnWpElQ rgrKoUbabXdswzlco Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Vk4y9i4wrZRl1UwV4vYE8mtzPGt0B4Z9H Content-Type: multipart/mixed; boundary="Z4Ubd1X6gVANje86qA1T6PcTZ0LEUjeDw" --Z4Ubd1X6gVANje86qA1T6PcTZ0LEUjeDw Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2020/2/2 =E4=B8=8A=E5=8D=884:40, Marc Lehmann wrote: > Hi! >=20 > I upgraded one machine from 5.2.21 to 5.4.15, and one (freshly-created)= > btrfs filesystem wrongly shows 0 avail in df after writing a bit of dat= a: >=20 > Filesystem Size Used Avail Use% Mounted on > /dev/mapper/vg_ssd-data 6.5G 160M 0 100% /ssd >=20 > When at the same time, the filesystem should claim gobs of free space > (the df output corresponds to a time a bit earlier when not all data wa= s > written yet): >=20 > Overall: > Device size: 6.00GiB > Device allocated: 0.63GiB > Device unallocated: 5.37GiB > Device missing: 0.00GiB > Used: 0.22GiB > Free (estimated): 5.77GiB (min: 5.77Gi= B) > Data ratio: 1.00 > Metadata ratio: 1.00 > Global reserve: 0.00GiB (used: 0.00G= iB) >=20 > Data,single: Size:0.62GiB, Used:0.22GiB > /dev/mapper/vg_ssd-data 0.62GiB >=20 > Metadata,single: Size:0.01GiB, Used:0.00GiB > /dev/mapper/vg_ssd-data 0.01GiB >=20 > System,single: Size:0.00GiB, Used:0.00GiB > /dev/mapper/vg_ssd-data 0.00GiB >=20 > Unallocated: > /dev/mapper/vg_ssd-data 5.37GiB >=20 > This didn't happen under 5.2.21 for me, obviously. >=20 > Deleting some files makes the remaining space appear again, creating > them again changes to 0 free. I retried with a 76G partition but had > essentially the same results. >=20 > Only df output seems affected, the fs is still writable (I only realize= d > because apt told me the disk was full - the fs only stores apt package > lists and the apt cache). >=20 > When writing, this switch to 0 free happens suddenly (example with bigg= er > partition): >=20 > /dev/mapper/vg_ssd-data 76G 3.9M 76G 1% /ssd > /dev/mapper/vg_ssd-data 76G 3.9M 76G 1% /ssd > /dev/mapper/vg_ssd-data 76G 122M 76G 1% /ssd > /dev/mapper/vg_ssd-data 76G 201M 0 100% /ssd > /dev/mapper/vg_ssd-data 76G 244M 0 100% /ssd >=20 > Mount options are noatime,nossd,discard. >=20 > I see there were multiple reports for this and some discussion in decem= ber > (https://www.spinics.net/lists/linux-btrfs/msg95694.html), but apparent= ly > nothing came of it and the bug still persists. >=20 The discussion on how to fix it has finally settled down. https://patchwork.kernel.org/patch/11359995/ Will be backported to related stable trees. Thanks, Qu --Z4Ubd1X6gVANje86qA1T6PcTZ0LEUjeDw-- --Vk4y9i4wrZRl1UwV4vYE8mtzPGt0B4Z9H Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAl42ESUACgkQwj2R86El /qjaEAf/djoXqNEnYsKtQchfK+6I+Vqxxjun0vuh/uK5lVeT50/7+IpyUxdrcQ+3 oPU2qE5LNP3oavQahxmnz7Q0uH5UN3Om6PVqt/CX/LMeOUoHA8hUGx7s1g4edTIx x2ftNU5NWhwRND7KzYjvsD52gQZiWpWzyrqz6w+LwfH/5MWUVnwZTp7jpLN7eNZR E2MYphNoQvGoAC3jKqAWcwJuRHfigFB1cStrZnMJE1PjHmNrRYETiesQlBdfld5b 2xhFZ1mk9AMNfxCfrbgUreVOYefoT3ngWscYckQYrwTtKyoz3DvvZbWy4AOSB8m0 ZCXB+MHecnGVgemUeJANpelloXzjTw== =iw3A -----END PGP SIGNATURE----- --Vk4y9i4wrZRl1UwV4vYE8mtzPGt0B4Z9H--