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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 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 X-Rspam-User: X-Rspamd-Queue-Id: B7C4740005 X-Rspamd-Server: rspam10 X-Stat-Signature: wc5twiyq5e5mcjgkh5zsic8ikea6fpf3 X-HE-Tag: 1767714112-21346 X-HE-Meta: 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 ePANovEJ gGbuDxxO1n8vbmy7a/hGnLp3j9FPMGWPrdnxJIohNkko9wrGefZzMfUT+9o4BfCovuX37LqMDiyYZHyS+q/knGAOZOa1Q4oS928cCn0BNiXIVpFmC5BR0xMkEBYV2TwGdr4iAcNblaG9dk/fWKeGCqJ8R8rUW1TFohYLe3FxdUaj61cMShc8XpDQxSmRnsxtqD4d0tspsoIpwAzx6rP/DECRk6oIxzW5AdvA2lzvc+F4hc6m5OnzTaG4LBFy8MnSv3lBOuJD4U9oiMY99+Xjak9ahjnAW6MgyUYotLmcMTkaDjCRUFMXJRFDrRxl1czO8sHeKrbNQCYEPkrM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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