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=-1.0 required=3.0 tests=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 72990C282C4 for ; Tue, 12 Feb 2019 07:22:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 492352184A for ; Tue, 12 Feb 2019 07:22:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726238AbfBLHWa (ORCPT ); Tue, 12 Feb 2019 02:22:30 -0500 Received: from mx2.suse.de ([195.135.220.15]:33910 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725936AbfBLHWa (ORCPT ); Tue, 12 Feb 2019 02:22:30 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 1D1A3AE04; Tue, 12 Feb 2019 07:22:28 +0000 (UTC) Subject: Re: [PATCH RFC] btrfs: Don't create SINGLE or DUP chunks for degraded rw mount To: Remi Gauvin , linux-btrfs@vger.kernel.org References: <20190212070319.30619-1-wqu@suse.com> From: Qu Wenruo Openpgp: preference=signencrypt Autocrypt: addr=wqu@suse.de; prefer-encrypt=mutual; keydata= mQENBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAG0F1F1IFdlbnJ1byA8d3F1QHN1c2UuZGU+iQFUBBMBCAA+AhsDBQsJCAcCBhUICQoLAgQW AgMBAh4BAheAFiEELd9y5aWlW6idqkLhwj2R86El/qgFAlnVgp0FCQlmAm4ACgkQwj2R86El /qilmgf/cUq9kFQo577ku5gc6rFpVg68ublBwjYpwjw0b//xo+Wo1wm+RRbUGs+djSZAqw12 D4F3r0mBTI7abUCNWAbFkYZSAIFVi0DMkjypIVS7PSaEt04rM9VBTToE+YqU6WENeJ57R2p2 +hI0wZrBwxObdsdaOtxWtsp3bmhIbdqxSKrtXuRawy4KnQYcLuGzOce9okdlbAE0W3KHm1gQ oNAe6FX8nC9qo14m8LqEbThYH+qj4iCMlN8HIfbSx4F3e7nHZ+UAMW+E/lnMRkIB9Df+JyVd /NlXzIjZAggcWsqpx6D4wyAuexKWkiGQeUeArUNihAwXjmyqWPGmjVyIh+oC6LkBDQRZ1YGv AQgAqlPrYeBLMv3PAZ75YhQIwH6c4SNcB++hQ9TCT5gIQNw51+SQzkXIGgmzxMIS49cZcE4K Xk/kHw5hieQeQZa60BWVRNXwoRI4ib8okgDuMkD5Kz1WEyO149+BZ7HD4/yK0VFJGuvDJR8T 7RZwB69uVSLjkuNZZmCmDcDzS0c/SJOg5nkxt1iTtgUETb1wNKV6yR9XzRkrEW/qShChyrS9 fNN8e9c0MQsC4fsyz9Ylx1TOY/IF/c6rqYoEEfwnpdlz0uOM1nA1vK+wdKtXluCa79MdfaeD /dt76Kp/o6CAKLLcjU1Iwnkq1HSrYfY3HZWpvV9g84gPwxwxX0uXquHxLwARAQABiQE8BBgB CAAmFiEELd9y5aWlW6idqkLhwj2R86El/qgFAlnVga8CGwwFCQPCZwAACgkQwj2R86El/qgN 8Qf+M0vM2Idwm5txZZSs+/kSgcPxEwYmxUinnUJGyc0ZWYQXPl0cBetZon9El0naijGzNWvf HxIPB+ZFehk6Otgc78p1a3/xck/s1myFRLrmbbTJNoFiyL25ljcq0J8z5Zp4yuABL2RiLdaZ Pt/jfwjBHwGR+QKp6dD2qMrUWf9b7TFzYDMZXzZ2/eoIgtyjEelNBPrIgOFe24iKMjaGjd97 fJuRcBMHdhUAxvXQF1oRtd83JvYJ5OtwTd8MgkEfl+fo7HwWkuHbzc70L4fFKv2BowqFdaHy mId1ijGPGr46tuZ5a4cw/zbaPYx6fJ4sK9tSv/6V1QPNUdqml6hm6pfs6A== Message-ID: <964481b6-e761-8d0d-3ef1-cbe19dbfae9e@suse.de> Date: Tue, 12 Feb 2019 15:22:21 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="uNnJyg30KTvunhfWSWEDcgNpz7uusz0iU" 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) --uNnJyg30KTvunhfWSWEDcgNpz7uusz0iU Content-Type: multipart/mixed; boundary="Ie0YjjzVkSh4kcUwNENyUat4DwzdfLQVs"; protected-headers="v1" From: Qu Wenruo To: Remi Gauvin , linux-btrfs@vger.kernel.org Message-ID: <964481b6-e761-8d0d-3ef1-cbe19dbfae9e@suse.de> Subject: Re: [PATCH RFC] btrfs: Don't create SINGLE or DUP chunks for degraded rw mount References: <20190212070319.30619-1-wqu@suse.com> In-Reply-To: --Ie0YjjzVkSh4kcUwNENyUat4DwzdfLQVs Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2019/2/12 =E4=B8=8B=E5=8D=883:20, Remi Gauvin wrote: > On 2019-02-12 2:03 a.m., Qu Wenruo wrote: >=20 >> So we only need to consider missing devices as writable, and calculate= >> our chunk allocation profile with missing devices too. >> >> Then every thing should work as expected, without annoying SINGLE/DUP >> chunks blocking later degraded mount. >> >> >=20 > Does this mean you would rely on scrub/CSUM to repair the missing data > if device is restored? Yes, just as btrfs usually does. Thanks, Qu --Ie0YjjzVkSh4kcUwNENyUat4DwzdfLQVs-- --uNnJyg30KTvunhfWSWEDcgNpz7uusz0iU Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAlxidC0ACgkQwj2R86El /qgaIAf/elCR7zq3rbAMFkUEdQ0l/Xm050pbzy5ga67ayhApVirmV/Y5If0KpeME HzOGEDORrL3nquE4VwU0bi4XEKKUbYZ8+sgpCVQaKl4iQXaPHWENd5Aw/zrecgrm yaAWAHRNuVbaeRt51cPuy9xv6JJuaC7tgJNKltbP369cMxweDAco2gUVZmgCEMvH amUYESljdGKWswkAHeJj6cCj9XBDrufa1b8ybpiAm1xmKrQn5ygZxF693CWcZGDW MCjLB0yDrT7h/Zk/XG8aSoCX6sL0h+nJpMA478cZ9Md14GSyHWsHnC488zr2augK tWZyHR5zqiK3ok6vLcTeZbJH0gr6bQ== =YT5F -----END PGP SIGNATURE----- --uNnJyg30KTvunhfWSWEDcgNpz7uusz0iU--