From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 5DA7F26E709 for ; Mon, 13 Oct 2025 12:48:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760359737; cv=none; b=WesxYSMME8Ga4MkElv0bHMz5yWuOm90IjC3vn/qGnFiXmxTE8suAvP43fSxi4eAHw1G+cG0pCr07E96vlncCpuJGKeLO3GP/lgJf5kf/5IL8SpiiKyJUFTXCoi9wrbtnCQx5VeI5ldSPW2dEA/JCnRnSx29HLxlj2FOwXmed5yo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760359737; c=relaxed/simple; bh=q1/1g1aOp688VA6iTlmc6G4Gt6IPhwQ6SlSbAlgfVko=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=MGSmOi46F2qZ6EUedIad21xg9GoJ1WdnjRfJHhL013dYLrjqYJZlTthVwdl/8YYSK0PgeIbMFvJE/3Lal61kFuUKigYKQD/ktTkFWxBpGzMlviAxXX+pAoO7MBc1io4JDHgD5adArfzcJyVUGHiyk+v0M1ZpFzu9D84qSQcBrjk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=gCeK9oDb; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gCeK9oDb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1760359734; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=V6YxR1nTJCDrfaOZFN3CnG2vV5jcoOfzGFCcTcZo0jw=; b=gCeK9oDbwUpVGMJ5X0xQoBymzfm5LIlOlFfHGArX5/g7WHLGr51MhRSij2X5tRlyKBSCae noFeR2Ep06+Y5IVIA08vsZ3x8Ro3M4Gw5OxZhmAO3pPVejO29nGTsMW3vk4spQnSUvfoXa vEyBf2buwCQswLRQJlF+bjUxusvbmVY= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-383-UhukpOdZPvSaUfpKMSmLIQ-1; Mon, 13 Oct 2025 08:48:53 -0400 X-MC-Unique: UhukpOdZPvSaUfpKMSmLIQ-1 X-Mimecast-MFC-AGG-ID: UhukpOdZPvSaUfpKMSmLIQ_1760359732 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-46e41c32209so22694245e9.0 for ; Mon, 13 Oct 2025 05:48:52 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760359732; x=1760964532; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=V6YxR1nTJCDrfaOZFN3CnG2vV5jcoOfzGFCcTcZo0jw=; b=ZONT4KQSXa2fo7Z2imHIP+3Nb1TL9tIXiAf2CLm0omfkgssIIjyTVU/IrEQExqgvNM HgpIYOLNTGxz6+pZmI6e2t5ITArn/3FUvf/cwjBA2vS9VRiLNq4yMcPgDP+JE6LVG+oN YwXCQjkDb9yPg26B0MMLrxX2t5CvvFbmTcXBGVhver2fldvF0TtALy6c6ivzpyucJ2O3 3SuHnJ6aCokmiEwFWihHgTAJWCrEm/CtmpaKTVeenvOdn+hKAgOU7iUGCtokaic/Lkva DdqO4scD4JjpZ8FAPqfuioxOTQwiv0sVNCpj/vmz/xcVusPAfZbR6OfzNqLN7o9dLCD/ 6jGQ== X-Forwarded-Encrypted: i=1; AJvYcCVHfKjWGdzPHmj1GXFfbF3mcdc05uo+ltAK4pia9V9zD0+8g1pnuE3tA1nId2YCIc8xLeS6py04orvG@vger.kernel.org X-Gm-Message-State: AOJu0YxoBxe7AXEP3ztCrgGP0FLoGKgXtd1/6eV72raMNNYRwoU9g1WG P3ymFiaducjcgiJAYJs7nKqXLkWHz6ZWOEh637ZIA+fleq8BlhMoLXcW6OQ9ezlG8e48noKeWIA 2OedHjpdnOdFeI7PbtUI4xiAxZgb2S8HrTb0SJ5Uu8EnEVE+uDIn/MmmMZ5JwcrI= X-Gm-Gg: ASbGncteqesSzq8pCRmd6b99Ub5OF+4CxPndVm7l0GTsLJ2saMfsqqPF9aTIuJI5EJ3 mGo+ec2ynKDFnrF0mgJKKtUdh/TLFpTq8ZJBcb0FPLm/dcZnEqh0DM0J73DBIRNP4Hp7qlp5Lx9 4HWyz/ZJhVIiwj1B8GrmuBcf8Vtv0evNqWI/JKgBRY8BFhdxBGVUA7UHRWs6A0q99MxQriTnSqX yN12y5UKfEy/l17ODJ1qvnPO6HkVI9KY9dIH/30X7rJviM1x68NgDz7Kv2aniQrf0eu+SYhVKMy tbLQc6yCl8ud/TxXSR0tpKHxkOZBKdnkbLaaR9SAMq2rksRdeVEU3dc8TwW5MJGfH1eRQSnD+wq iFFg= X-Received: by 2002:a05:600c:530e:b0:46e:4c90:81d0 with SMTP id 5b1f17b1804b1-46fa9a8f1c5mr144086795e9.2.1760359731939; Mon, 13 Oct 2025 05:48:51 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGGLnouyUlx2MAgaHkKm2L1dKdQ4wuo7Nrhykv7xLHekC80pf6DEJPuKh5QZvTCPV+to9J8TA== X-Received: by 2002:a05:600c:530e:b0:46e:4c90:81d0 with SMTP id 5b1f17b1804b1-46fa9a8f1c5mr144086535e9.2.1760359731494; Mon, 13 Oct 2025 05:48:51 -0700 (PDT) Received: from [192.168.3.141] (tmo-083-189.customers.d1-online.com. [80.187.83.189]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46fb497aec2sm189420095e9.1.2025.10.13.05.48.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Oct 2025 05:48:51 -0700 (PDT) Message-ID: <41f5cd92-6bd8-46d4-afce-3c14a1cd48dc@redhat.com> Date: Mon, 13 Oct 2025 14:48:48 +0200 Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 06/10] mm,btrfs: add a filemap_fdatawrite_kick_nr helper To: Christoph Hellwig , "Matthew Wilcox (Oracle)" , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , Chris Mason , David Sterba , Mark Fasheh , Joel Becker , Joseph Qi Cc: Alexander Viro , Christian Brauner , Josef Bacik , Jan Kara , linux-block@vger.kernel.org, v9fs@lists.linux.dev, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, jfs-discussion@lists.sourceforge.net, ocfs2-devel@lists.linux.dev, linux-xfs@vger.kernel.org, linux-mm@kvack.org References: <20251013025808.4111128-1-hch@lst.de> <20251013025808.4111128-7-hch@lst.de> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20251013025808.4111128-7-hch@lst.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit > @@ -474,6 +474,28 @@ int filemap_flush(struct address_space *mapping) > } > EXPORT_SYMBOL(filemap_flush); > > +/* > + * Start writeback on @nr_to_write pages from @mapping. No one but the existing > + * btrfs caller should be using this. Talk to linux-mm if you think adding a > + * new caller is a good idea. > + */ Nit: We seem to prefer proper kerneldoc for filemap_fdatawrite* functions. > +int filemap_fdatawrite_kick_nr(struct address_space *mapping, long *nr_to_write) > +{ > + struct writeback_control wbc = { > + .nr_to_write = *nr_to_write, > + .sync_mode = WB_SYNC_NONE, > + .range_start = 0, > + .range_end = LLONG_MAX, > + }; > + int ret; > + > + ret = filemap_fdatawrite_wbc(mapping, &wbc); > + if (!ret) > + *nr_to_write = wbc.nr_to_write; > + return ret; > +} > +EXPORT_SYMBOL_FOR_MODULES(filemap_fdatawrite_kick_nr, "btrfs"); > + > /** > * filemap_range_has_page - check if a page exists in range. > * @mapping: address space within which to check I think there is still a discussion on the name, but in general LGTM Reviewed-by: David Hildenbrand -- Cheers David / dhildenb