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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 739CBCD343F for ; Fri, 15 May 2026 09:19:42 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4gH1qc6cNYz2xRs; Fri, 15 May 2026 19:19:40 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=213.95.11.211 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1778836780; cv=none; b=jc40GKJp9bF+kWlSO5qCYQFKtdAoExGIIFNwlSsTo1hV8E7W23VjQGLE4B+V8kjo3pbh2ausQzR0yPeLyHSfOfPoeTz3O0VzR7jFa3749hTlTXO3O8Hy5Nvlwe90l5M44RKUYRMxP/JIr6p9Ht30/xfof54+VM/6jb0vGoLsLaC/TRDCQkEvbPZ83FYKfXnqaCEEzVw96ge2T3aSZRf9m+liZKHouAG2kBPFg7uxP/e3+sxRE1hpzT+QRkr080AyVxj++lK5n8MSzahyKzK5p13sagoNebbv0c2Ma6FqELwH+OVKbr+r2cG0JuLmBsYu223pwyz6rIK2NwZRiffXNw== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1778836780; c=relaxed/relaxed; bh=A3ggIcTT9QpNE6xAWUcm+Edx6+JDZ1X1JlzR3+EsdbA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ONQs14cg/6mEpFSLcNA1vRyGKbK5azfFEKuCPCu+aDw5qXqnbGhfT9dN24jZCgMmNFludMTcBokKXHygxzy0r5t7YnuKaQDqiYkgfH/AkSpiMU9RKQ0a+CiQawycfaUhfkHZNGpaiVW/7rAQ9oPj6HpFHGg4fsnQpXyZPl0Dqq4P3tuf2Z5Y1PBTi231N5RW0uOBClcCC5VtI6fzhk1g8gxxHs1oT8jWz6vj4iahPwqpmVsTtjk5J7ccbA1r2xDGLbDkF6PfldjlzCE24LWKJyx0mhwxEBbv4Bu7BiM7cfHM+W3aU95BBH4k/1gjSSSEsJhe+RzODtIUv9PUJPN4Jg== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=lst.de; spf=pass (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=lists.ozlabs.org) smtp.mailfrom=lst.de Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=lst.de Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lst.de (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=lists.ozlabs.org) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4gH1qb5qQFz2xPb for ; Fri, 15 May 2026 19:19:38 +1000 (AEST) Received: by verein.lst.de (Postfix, from userid 2407) id 1C6DB68BFE; Fri, 15 May 2026 06:37:58 +0200 (CEST) Date: Fri, 15 May 2026 06:37:57 +0200 From: Christoph Hellwig To: "H. Peter Anvin" Cc: kreijack@inwind.it, Goffredo Baroncelli , Christoph Hellwig , David Sterba , Andrew Morton , Catalin Marinas , Will Deacon , Ard Biesheuvel , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Herbert Xu , Dan Williams , Chris Mason , David Sterba , Arnd Bergmann , Song Liu , Yu Kuai , Li Nan , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-crypto@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-arch@vger.kernel.org, linux-raid@vger.kernel.org Subject: Re: [PATCH 01/19] btrfs: require at least 4 devices for RAID 6 Message-ID: <20260515043757.GB3855@lst.de> References: <20260512052230.2947683-1-hch@lst.de> <20260512052230.2947683-2-hch@lst.de> <20260512114231.GG2558453@suse.cz> <20260513054742.GA1018@lst.de> <0a8d1ff4-f5a2-49e9-aa45-d25dbe4ded40@libero.it> <0507CCEF-0548-442F-8703-1D006B5E068B@zytor.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <0507CCEF-0548-442F-8703-1D006B5E068B@zytor.com> User-Agent: Mutt/1.5.17 (2007-11-01) On Thu, May 14, 2026 at 12:57:53PM -0700, H. Peter Anvin wrote: > That's what I'm saying – it should invoke the RAID-1 code under the > cover (as with 3 disks, D = P = Q.) Yes, if the btrfs maintainer cared for this setup that is what should be done.