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 A275930C61C for ; Mon, 8 Sep 2025 15:10:29 +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=1757344231; cv=none; b=n0DUdQpDDLDSMMfBZxmtViMPfsl3o+RatbQHMb2eWFE6RgQDjwhEnHzik72rK3fx5KHzcNy12V1I0FVQKyvVSiDbNvvgSkMyx5V3htkMZbi/N3t3e68Z3Xqo49lSX6tfMIuWl8VrLWhaYJfpw/LHKZu1/YFl0IRuOCszHQNOs14= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757344231; c=relaxed/simple; bh=+o2tafkg6TjpR08DCjpzYMHUFNGJ83pFkPMS/W5xD2o=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WOu8qqZ8QYAJo9WEC6LyA1p+GYai4mOl8C4wNpf+Vmj36xJTPaIyCBs6N68Dmnfh4qVmH3roirUBCXU/9B/Na0WTNhiEXApogwtOPRlotjiAM8h6JAG+4hw2VqsmiMq7f5flfXGsumj6vW3pIMS4ApNRfICq8ZvPq3iKeXhbFX8= 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=eSUqyYgX; 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="eSUqyYgX" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1757344228; 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=MWs38ipt6qYVKPoOaNWVE9IjFwNAzWbj0IVoNQpA9LM=; b=eSUqyYgX5e+Fmj+QaYD0LUGqC8yvHxlgeWnbjAy4nkoi4iVJlWg1rByA1f7uemrYU9qMUi uyegjyohPHFIpMkE6EqvFfjVds/9KR9n6ffOVSxX1u9ukIb1+I5dGuY7pvWwiy5jvp7Feq ln+p5cL+Zt3IMmm6EKutOloYx5QWeqQ= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-683-inM_BXq9PiazA837xxmM3A-1; Mon, 08 Sep 2025 11:10:26 -0400 X-MC-Unique: inM_BXq9PiazA837xxmM3A-1 X-Mimecast-MFC-AGG-ID: inM_BXq9PiazA837xxmM3A_1757344225 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-45b990eb77cso32840655e9.0 for ; Mon, 08 Sep 2025 08:10:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757344225; x=1757949025; 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=MWs38ipt6qYVKPoOaNWVE9IjFwNAzWbj0IVoNQpA9LM=; b=DRadUvscMOw6WXyJt8IjwDhw0LxKUHwsHbjkrxDAdRLsXyNw+wnVeIoYRfP2cFjbNm 5XDiAb9+5jlnpMnI2rzw8KOf/QcvAMpyKXGB54qzFm71KWqHAFgJsX/m/k32/Wk/JPfv OMY6xcBfbN63Xoxu3RrWChvUMxEUi2bhPl0CFz0Sr8KkzvwD0CKt+ZzIirSwFhJ14UwS xiRcIFzAuRMHlVVIf0e8Islay+OzsmDIPR10seFBZj1gPY8rd5TKJLAs20n6BfU3RdES Yr83diCpFg+ppkpYQsCY5DjpIjAwTrZ68+lqT1VPq6E2ufZg35YhAyhrO/tVrJmAEL9t ceiw== X-Forwarded-Encrypted: i=1; AJvYcCVD7U2VrxGqUbEs64vG9crGwgOhB9VNFhQ0tITOfgcdwzJJAGECIPs7OzxSq7o8VVNJW4v+dZO7Md/3@vger.kernel.org X-Gm-Message-State: AOJu0YxlWvuQAY8OoUFEYODZSsAxrJQkvZlKwvHFColJHM8f/Mg1noUl OPqWGtzSxB6K++ZDkoewjpu224oq9si26hT1dQIJc2BwoniRdoRMV4T81OjThtcXMpy+HzlugdC cKvZvtBHJvXLqkOFiRCNr8MVS6ON1X7CN4xJyl1cdydci97N55Mge7mHMieQTl0c= X-Gm-Gg: ASbGncsL0bFLfxSxrCrv0L7fzZqfEx8CqcKCcdUnZZJMD+WbJR6PI1CtCTH3IWvhJvs L//4deaM0hevQltGIZiG6LTOnxEcBLH+AwHIMqEAyR+UGN4DmRGbibi0/WA/a/ROosQswn31lyV 3Mf1JXd/4zBnJkr/OrzOynzFScBu0pBlOauMv2ttu7vGLs68VZloF9HncUIICansMi6hZjirGT0 c1dEYoc9YZQU5gQ61hsyxitCc1XfLD3vnZ/u3ZQHSf1Z9LMkj4GQxaRCEnQ0L4BXGpOrn+aDZmC fhClcNML/MRKI4zjHxOkZ7m1gyHp715DsCnF0FOwidS7ctzUC7dVlTdTQwZ9JDmq3xLSSmoqc1I xnl+ve2T2yL3VxCgbHhG5vlz7Cl1TQN9ePLLLdg3Y9U9Iojsj1ikSJPiiXHGyI9Zt X-Received: by 2002:a05:600d:f:b0:45d:e775:d8b8 with SMTP id 5b1f17b1804b1-45de775e1famr26225185e9.1.1757344224800; Mon, 08 Sep 2025 08:10:24 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGe7ZTfhfsgtooC3/5pep0igJoOBuPGNNCiAINQdm3uwOco5gprVmhHIhPkct+pdrN1/wAPVA== X-Received: by 2002:a05:600d:f:b0:45d:e775:d8b8 with SMTP id 5b1f17b1804b1-45de775e1famr26224795e9.1.1757344224275; Mon, 08 Sep 2025 08:10:24 -0700 (PDT) Received: from ?IPV6:2003:d8:2f25:700:d846:15f3:6ca0:8029? (p200300d82f250700d84615f36ca08029.dip0.t-ipconnect.de. [2003:d8:2f25:700:d846:15f3:6ca0:8029]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45dddf8c51dsm109133275e9.20.2025.09.08.08.10.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 08:10:23 -0700 (PDT) Message-ID: <076658ac-78bc-4d4b-bf3b-d04cd3f0fa21@redhat.com> Date: Mon, 8 Sep 2025 17:10:20 +0200 Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 03/16] mm: add vma_desc_size(), vma_desc_pages() helpers To: Lorenzo Stoakes , Andrew Morton Cc: Jonathan Corbet , Matthew Wilcox , Guo Ren , Thomas Bogendoerfer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "David S . Miller" , Andreas Larsson , Arnd Bergmann , Greg Kroah-Hartman , Dan Williams , Vishal Verma , Dave Jiang , Nicolas Pitre , Muchun Song , Oscar Salvador , Konstantin Komarov , Baoquan He , Vivek Goyal , Dave Young , Tony Luck , Reinette Chatre , Dave Martin , James Morse , Alexander Viro , Christian Brauner , Jan Kara , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , Uladzislau Rezki , Dmitry Vyukov , Andrey Konovalov , Jann Horn , Pedro Falcato , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-mm@kvack.org, ntfs3@lists.linux.dev, kexec@lists.infradead.org, kasan-dev@googlegroups.com, Jason Gunthorpe References: 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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 08.09.25 13:10, Lorenzo Stoakes wrote: > It's useful to be able to determine the size of a VMA descriptor range used > on f_op->mmap_prepare, expressed both in bytes and pages, so add helpers > for both and update code that could make use of it to do so. > > Signed-off-by: Lorenzo Stoakes > --- > fs/ntfs3/file.c | 2 +- > include/linux/mm.h | 10 ++++++++++ > mm/secretmem.c | 2 +- > 3 files changed, 12 insertions(+), 2 deletions(-) > > diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c > index c1ece707b195..86eb88f62714 100644 > --- a/fs/ntfs3/file.c > +++ b/fs/ntfs3/file.c > @@ -304,7 +304,7 @@ static int ntfs_file_mmap_prepare(struct vm_area_desc *desc) > > if (rw) { > u64 to = min_t(loff_t, i_size_read(inode), > - from + desc->end - desc->start); > + from + vma_desc_size(desc)); > > if (is_sparsed(ni)) { > /* Allocate clusters for rw map. */ > diff --git a/include/linux/mm.h b/include/linux/mm.h > index a6bfa46937a8..9d4508b20be3 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -3560,6 +3560,16 @@ static inline unsigned long vma_pages(const struct vm_area_struct *vma) > return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; > } > > +static inline unsigned long vma_desc_size(struct vm_area_desc *desc) > +{ > + return desc->end - desc->start; > +} > + > +static inline unsigned long vma_desc_pages(struct vm_area_desc *desc) > +{ > + return vma_desc_size(desc) >> PAGE_SHIFT; > +} "const struct vm_area_desc *" in both cases? > + > /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ > static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, > unsigned long vm_start, unsigned long vm_end) > diff --git a/mm/secretmem.c b/mm/secretmem.c > index 60137305bc20..62066ddb1e9c 100644 > --- a/mm/secretmem.c > +++ b/mm/secretmem.c > @@ -120,7 +120,7 @@ static int secretmem_release(struct inode *inode, struct file *file) > > static int secretmem_mmap_prepare(struct vm_area_desc *desc) > { > - const unsigned long len = desc->end - desc->start; > + const unsigned long len = vma_desc_size(desc); > > if ((desc->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0) > return -EINVAL; We really want to forbid any private mappings here, independent of cow. Maybe a is_private_mapping() helper or a vma_desc_is_private_mapping() helper if we really need it -- Cheers David / dhildenb