From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C9FE322F77B; Tue, 6 Jan 2026 15:41:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767714112; cv=none; b=mz9hKXfJ1kMqtlvv63VVOVu4+GzPsDsGVLzE5wn3REVq1MEU0eKpnb9WLX7Krx9sfUFiAMcGmC4fm8/xjUiYPbxGAccA1s03Ex4b6aRtul3dE1sbB7xUetKiGtj3o2R8QSYUc5D2Yt4eXXrSG0OjmIUvqyjIjPfOPO9TysgyT2k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767714112; c=relaxed/simple; bh=lLS8KmtOZp2zZZScnCqYpBIcm1XXF9y6DjF8nyQEl2k=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=fcaqhZf2xsc6NCCuXg3hv09tobVyTMFkx6hB5SsjU9/CsoaFdrw86Q6uI+dITQx+xJz0tJ54b2H4bY2yyRtqVveh5BYpLImHaAV1r4EIRyGfE3ZjqCOnhqOg67HIfBMmPRN6B417ykbaqTDbx1DEhMwdEpoaunWvKvoIHjrte0U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=g3oqSPRr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="g3oqSPRr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5CC48C116C6; Tue, 6 Jan 2026 15:41:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767714111; bh=lLS8KmtOZp2zZZScnCqYpBIcm1XXF9y6DjF8nyQEl2k=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=g3oqSPRrkU8q7sONds5Cf2OqAY/lUYNmQljRgD2wu+PLkdCs7+5lpK02C3YF2wcOy KXpMmdJ+qc96quWHQW6pIOk+RWVePLuLHW0J3pxbMNeJFbT+mOv9a+cxksjTrGbIQ1 H1E1dy1AmyLWTtQYUHnNq4LAG3CvOFHB8eUzN8J4/DrB6dL4c4ivpUZVHGUu9HZoQG O07TtVhyC4IXPUzFkblGph3FTi08R2Wr1y7Y3iBaaGO7zw13sCtFRdCWHwqq4yGt3/ O73JmTX9H1tfnccCgB0x5C8t+Kxfxf6vDHGLp6wL/2X4ZUZy4RjBAI8S0g8++Tpbrh dqzGbcx8AkGYg== Message-ID: Date: Tue, 6 Jan 2026 16:41:46 +0100 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/1] fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes() To: Miklos Szeredi Cc: Jan Kara , Joanne Koong , akpm@linux-foundation.org, linux-mm@kvack.org, athul.krishna.kr@protonmail.com, j.neuschaefer@gmx.net, carnil@debian.org, linux-fsdevel@vger.kernel.org, stable@vger.kernel.org References: <20251215030043.1431306-1-joannelkoong@gmail.com> <20251215030043.1431306-2-joannelkoong@gmail.com> <616c2e51-ff69-4ef9-9637-41f3ff8691dd@kernel.org> <238ef4ab-7ea3-442a-a344-a683dd64f818@kernel.org> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/6/26 16:21, Miklos Szeredi wrote: > On Tue, 6 Jan 2026 at 15:34, David Hildenbrand (Red Hat) > wrote: > >> I don't recall all the details, but I think that we might end up holding >> the folio lock forever while the fuse user space daemon is supposed to >> fill the page with data; anybody trying to lock the folio would >> similarly deadlock. > > Right. > >> Maybe only compaction/migration is affected by that, hard to tell. > > Can't imagine anything beyond actual I/O and folio logistics > (reclaim/compaction) that would want to touch the page lock. I assume the usual suspects, including mm/memory-failure.c. memory_failure() not only contains a folio_wait_writeback() but also a folio_lock(), so twice the fun :) -- Cheers David