From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f47.google.com (mail-ed1-f47.google.com [209.85.208.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 128953E00B5 for ; Mon, 13 Jul 2026 09:19:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783934386; cv=none; b=i9ViJ/9WY38AIVc8uqS1Wwt5HtqlaD+86cCArif+Gamxl5tGLpmmm2OfNv/oiTXTV2jWhF6uIYpHUjUmLx/7VcnKjpy7pKAfmxosNRdcJgQ1Vn2J3F84/rhyprwxG4Cjvb2BzgRInet1e4s8Brwz8BNCEhYvj65jFzuhsFuhRhc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783934386; c=relaxed/simple; bh=3ZfdHrAjeIKCtzgFro/qo5aWAh/WGZIlIka4TDu/DAE=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=dJy2F1+U4UJ80jZmKwcO/VIw9AXsSelzBMORad4X08Q70093318DQiL9TUsPpQS9T8mHXbSmTUtgOg02OsrzMQnwH0gHU/a2Cys9AoqMBA46bysSpJdMfPFUCLJSRV2S9P5sRqgGItjmFHj/cHVvYEftAX1HxzQooWg+WQGnzO4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=a8/hl2dZ; arc=none smtp.client-ip=209.85.208.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="a8/hl2dZ" Received: by mail-ed1-f47.google.com with SMTP id 4fb4d7f45d1cf-69c19a37eeaso5681861a12.2 for ; Mon, 13 Jul 2026 02:19:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1783934383; x=1784539183; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:autocrypt :content-language:references:cc:to:from:subject:user-agent :mime-version:date:message-id:from:to:cc:subject:date:message-id :reply-to:content-type; bh=f5qgJIYE3jPPN16EaxeYkTdaYU5IoLrksy2JUMgb8Rk=; b=a8/hl2dZfjdhZMcnMa6sUds7vxP+A/fKRCLW1yNGzA7hZAYC/aYL05PW8hAO54ydhL LJiMd2LoXHkbtldGn17+RRQSZl39gDJsCNpS6JvUPLigVPbBELpEVcw069YfWh+wds+i 9rpU/4zJ97L/eGf1saWtXsYnWk5vi2vUAf1m32+yMhVL1rlvkGJujoBou/PIQlBqzcU6 pZBx3Ix2EBe3vLtbbOqMHwrgh0riOqQlaMZ03NK/FZhQ2aBAPy3Xb1kWrbMfOAetgbTW XpNFiN0hwr7AgLEebXznaocdACMFPTFCiC7a/y+NlSFPjzh1Zrnrr7VhVaiO4rhgCl7G gHRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783934383; x=1784539183; h=content-transfer-encoding:content-type:in-reply-to:autocrypt :content-language:references:cc:to:from:subject:user-agent :mime-version:date:message-id:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to:content-type; bh=f5qgJIYE3jPPN16EaxeYkTdaYU5IoLrksy2JUMgb8Rk=; b=Po0pQzCyx4F2nWqyo8YGdJ4xtINZu3k+7M7uC+cZ6v16jGyjaQlvInnXt+8M3tzb3z 7+wyRWRVspFEDSLM/O804lAQM/MZ2PJ+t55zokY+GegeSarnS5rpFHv9F9hk0O+liX/r KFfz/Sqk051kkOH2+OMsMel+k7kaZ1fGjKBXvsAc69FBWx+iAFle8NZKw5yTX8myZKIC mE9nRhVRztG0ezp3wv3a/C25ETt4dwYYABLkWN51gJrE+R2zYPOda9fif0CYw9XIUBUi XlmdSwYTmR5i8NpTxCiuUCnQ+Mg4kPepkVVEdA0qjerfXMzcbNNYWXnxJRzIqrr2S1dR 2aRg== X-Forwarded-Encrypted: i=1; AHgh+RrlJcJPLr1JFGUHWFFBePPbVuzyElv9qrLSy8KJz3jK8vjG8bVTlow7/f6nNOKGVO0RLl1YiUM0SuBF@vger.kernel.org X-Gm-Message-State: AOJu0YzSLORI7ku8CJ0ywKE+OQ66BGjzxJ4AOnSru5dFSkuCjhAxZMef eNrzvvi/rHZIVKbrZ3qzEmOKDNOR42hGxIOj9RmSNT1iSnqmlxq7EQxluil+oUC8vII= X-Gm-Gg: AfdE7ckMSxd2Ig5s+P1ha/GHwTYz3n648Fx3mRT5Lf1vr+VI3/K2DRu3pBJ1CJnnsZK 0ChYgkh/56YJhHDUsVSu/aj6igrSXOsWoTiZDuL+wKayU2H2Xnxvo0AMEzyuWDG6+afXmOTJ3rr yN3+eVZDjHCtDcek9pU+Mu7XCoPyoWQbgbox9jM9toi1CrgmVlh9V9JY5SV41cYjGByzBOf0pw5 eFf8N4vHyIRGTshWpnlihRlpCsWknllIBJj4caL5p8dCC8ImYP+XEtKQNcKbCaO0k3cINOIzRUV IWk85CIeEGkltYOJNvNXr9AzXPYV2yZc0XmrlP2Jupp3xXn50R+V1P3WdJ7DKNvO1QSY6SbJ93q zwZw9O9+zG/DX16WnSuDc1u0G9twyRIytwfnranaW9HReGC5P50N0IR9MifWk4XT947f1aULg94 0WkOLV5w== X-Received: by 2002:a17:907:783:b0:c16:c65:56b5 with SMTP id a640c23a62f3a-c161e8e97b6mr384403166b.24.1783934383403; Mon, 13 Jul 2026 02:19:43 -0700 (PDT) Received: from [172.16.0.229] ([159.196.52.54]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38d2fdd777csm3373649a91.1.2026.07.13.02.19.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Jul 2026 02:19:42 -0700 (PDT) Message-ID: <32c03d5d-d5b4-4954-9bc7-d7f64e46fda1@suse.com> Date: Mon, 13 Jul 2026 18:49:37 +0930 Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/3] btrfs: disguise single-data-RAID56 as RAID1/RAID1C3 From: Qu Wenruo To: linux-btrfs@vger.kernel.org, David Sterba Cc: hch@lst.de, linux-raid@vger.kernel.org References: Content-Language: en-US Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi David, I know you hate this way to fix the problem, but considering it's already 7.2-rc3, if you do not like this method I think it's time for you to submit your alternative. My existing patches still apply on the latest for-next and is known to avoid the extra warning from RAID6 lib. Thanks, Qu 在 2026/5/22 18:53, Qu Wenruo 写道: > [CHANGELOG] > RFC->v1: > - Remove unused btrfs_chunk_map::io_(align|width) members > To make space for the new member. > > - Fix a duplicated bg->flags assignment in fill_dummy_bgs() > Just exposed by the last patch which also touches that code. > > - Use a dedicated member to record the on-disk chunk type > So it's less fragile than the RFC patch. > > The single-data-RAID56 (2 disks raid5 or 3 disks raid6) is not a feature > that should be supported in the first place, thus raid56 is going to > remove such support. > > Meanwhile rejecting single-data-RAID56 will cause existing btrfs users > unable to mount their fs, even if there is only a single > empty chunk with that flag, mostly caused by some degraded mount. > > So to avoid impacting existing users, implement an internal > single-data-RAID56 to RAID1/RAID1C3 mapping, to co-operate with the > upstream raid56 lib changes. > > Qu Wenruo (3): > btrfs: remove btrfs_chunk_map::io_(align|width) members > btrfs: remove duplicated block group type assignment > btrfs: disguise single-data-RAID56 as RAID1/RAID1C3 > > fs/btrfs/block-group.c | 3 +-- > fs/btrfs/volumes.c | 25 ++++++++++++++++++------- > fs/btrfs/volumes.h | 10 ++++++++-- > 3 files changed, 27 insertions(+), 11 deletions(-) >