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=-1.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 0CF6BC169C4 for ; Fri, 1 Feb 2019 01:45:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0ED320844 for ; Fri, 1 Feb 2019 01:45:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=dilger-ca.20150623.gappssmtp.com header.i=@dilger-ca.20150623.gappssmtp.com header.b="D6KXrh/w" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727438AbfBABpe (ORCPT ); Thu, 31 Jan 2019 20:45:34 -0500 Received: from mail-pf1-f169.google.com ([209.85.210.169]:33576 "EHLO mail-pf1-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726425AbfBABpd (ORCPT ); Thu, 31 Jan 2019 20:45:33 -0500 Received: by mail-pf1-f169.google.com with SMTP id c123so2368764pfb.0 for ; Thu, 31 Jan 2019 17:45:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dilger-ca.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=Dk9TPM/GdHHvDXo1P3dyIp+qMpX7IJSJ1nAf4Wsnz0Y=; b=D6KXrh/wqM7FCn4S0q58BwA3kcEMo33yNHTvxVpN429OKJp43/xeAdY0pM7yt4N946 6lHbO6w5exNiaCQ7XhaWi5jcIaY728E6+kI9ix1UtJ75cpMBeBIwJ8hiySL01Rpcbfs2 tire1n7RDse+Rh/ftC0IUIzL1Hlgng2W6oDByKtvwp/9DwlCBsf2qmSHx6Cp6Cy3XWDq u2c4PdvLEqile+fgvfoNe2GuVS+SWGVYlXkPfhdo6tSVBxBo/am4SY6uc2dLubVOAKIF Vxscwivs+hLJGa4/4ZAr/w0UVe9UddVOu8Ye5ep96vNqrG5nkxxcZy+PcfNtUHNd7SBI 6jcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=Dk9TPM/GdHHvDXo1P3dyIp+qMpX7IJSJ1nAf4Wsnz0Y=; b=o+ec5aKkPF4p5JBNqsW051vSbCkwqhTkHly+uzFHRNGdfbI7qc9iOzhg73UozqtMJ0 Y5d9WyDOSoDzLkTZoojIvWRh4/5hgBo3AUqKB1LcvfO/ttjo79hUioJD/A9iR9du3AR/ wIueLHT2HVUIZ2eCaVxonZR9gVdiKOByq9v5wIimmF+QV5OY5rN6RseG/LPEmssB0mzJ rAGNkbgVT9c5VI06FWnJTuR9xOl79aaSN+rKzqva9sy6wmFy0c0uzIVElmGq3ujYYi3a phE3aIT9CSdsK7X0eE3ckcEL3S/QQydFBqd4VG6T+EVgwA9r9VlbDdSOqrKZmEMzdInW a+xA== X-Gm-Message-State: AJcUukeRVQRiV8PTSMnp0MtvvYplqdn3nDuZTjOWQk7YGWs82fOn8ccR mG4W4y7CbuaIyHK4+Tx5sdU/yYvGIvQ= X-Google-Smtp-Source: ALg8bN4ZiIzZ49m+I3ISHk5IHfEg60V/WKdkjVf/NH+TbBIVfXb/EKxmHT+m+QrOt1fPbD9YGhDPQQ== X-Received: by 2002:a65:50c1:: with SMTP id s1mr32886387pgp.350.1548985532648; Thu, 31 Jan 2019 17:45:32 -0800 (PST) Received: from cabot.adilger.ext (S0106a84e3fe4b223.cg.shawcable.net. [70.77.216.213]) by smtp.gmail.com with ESMTPSA id l74sm10617797pfb.145.2019.01.31.17.45.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 31 Jan 2019 17:45:31 -0800 (PST) From: Andreas Dilger Message-Id: Content-Type: multipart/signed; boundary="Apple-Mail=_3D2DBF02-7125-4239-A639-44D714FE66E6"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: question about ext4 backup block group descriptors Date: Thu, 31 Jan 2019 18:45:29 -0700 In-Reply-To: <4fc3271a-3098-afcd-24c1-e2e130e1e86a@linux.alibaba.com> Cc: linux-ext4@vger.kernel.org To: Xiaoguang Wang References: <4fc3271a-3098-afcd-24c1-e2e130e1e86a@linux.alibaba.com> X-Mailer: Apple Mail (2.3273) Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org --Apple-Mail=_3D2DBF02-7125-4239-A639-44D714FE66E6 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Jan 31, 2019, at 1:07 AM, Xiaoguang Wang = wrote: >=20 > Anyone can help answer when ext4's backup block group descriptors are = updated? > I had used blktrace to track the corresponding backup block group = descriptor > block, but didn't find that any backup blocks were written. > Thanks in advance. The ext4 kernel code never updates the backup block group descriptors. = That is only done by e2fsck. Cheers, Andreas --Apple-Mail=_3D2DBF02-7125-4239-A639-44D714FE66E6 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIzBAEBCAAdFiEEDb73u6ZejP5ZMprvcqXauRfMH+AFAlxTpLkACgkQcqXauRfM H+A3kQ//dVyUSJXrLZe5yszNJlo94dOJeoG8DFaMosKr+6J8KBvwWo0OdToGYjB+ ms+/Ct6q7m4vAcd+J9nTj3a0YMFqKFKX21DZRzGDaqXnyhKOly+U/3Eb1iQMWcU1 IqFuCIEIqEJh/y1f9L87izhsahlu0qesQ4QH8M0fHZxuuHrEQZ01wLFS/BPWGDzn 7seHrG4Sdg/+pRInVg1n266gl0s9K23wMvh0caYqf9F6/j2Xk+u80/eOWmWeMbbK LKAkROJgbYorPoKgt+aOWGdkhzWbpROg6jvC/xeRrys1Ye6jaejTf4NsMuwb7268 vPI+WbrLw5WsI0dGff4tBz+FxqEGu1pAXu/nxl4H52B5dNjOv0aZuJIQ6S6VHu5e dVpDjZsgkdKwfyDHvHu0M65CCXyhX1HMzpLcznjFKGrSirXVVkyJXxaUMvSx4Ks/ nAPH96ih0vDR2ZA3TRsQpqr3OidddhS4r6NcWTVe+tc0R2cB17pgxs/wgMkyJhPH aJtam5ceMAoOzmy/drh2BL6yTP4XRF46a32WAImB3o/JdKN4rnA3R0XRBu5+e45U LEtLpGi2ywR55EyAO2axoF3LBOK5rC9HSEayADOxqpqnFq7lp8gxZrbED+nQendI lMCTWETn3R5J/9F5nM5wi29IEegE/pqZruK4COP7TqfaFZXE3M4= =adm6 -----END PGP SIGNATURE----- --Apple-Mail=_3D2DBF02-7125-4239-A639-44D714FE66E6--