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b=Z1TbNG9CpTxcy6DpAY+80uBkMJ AsYaVD7oqKSOXgE9NsGc/405ZZAEWccRkgPIM/deRvYGRjqq2ZKGmKUQDJ94rtuq+PTCf6cC6JU+G EtpsNOMu4blF5yhEFYkUsWjr/ce4Hr2UcqUA9KO85CWp/SEBL0yekBMWb7bDmTGzLQMgFTEnhIGpR L5EUlII81UnD3//exZRW357uOOQfKLvTaRZalC+1KGGmolgW2VriezGI+KbtU97nVh083tYH/sCxA hKwrsZOTuy7PwJs7L6p0636nIl54WecZGYTDUj1RoC24hSBA6pmsnO/zXCU78yVrYNBvBFvYsuZJq JZbZhzzg==; Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1veRxl-00000000HUR-0L0v; Sat, 10 Jan 2026 05:56:37 +0000 Date: Sat, 10 Jan 2026 05:56:36 +0000 From: Matthew Wilcox To: Qu Wenruo Cc: linux-btrfs@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Johannes Thumshirn Subject: Re: [PATCH v3 1/3] btrfs: use bdev_rw_virt() to read and scratch the disk super block Message-ID: References: <829db7e054cd290b5aed0b337cd219da128ac0e7.1768017091.git.wqu@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <829db7e054cd290b5aed0b337cd219da128ac0e7.1768017091.git.wqu@suse.com> X-Rspam-User: X-Stat-Signature: d1bnm7dbrdspe6rjrodjk1wy5gbgogjj X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 666BF14000E X-HE-Tag: 1768024600-569397 X-HE-Meta: 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 xR3jC9Sk JnpQv6HQwobLiOQ53I0mnpN6ipIYjYao1JucG4XV5ItbeoedGwcNuN4TkDfQlLCpoA9kNaohK16QNpX2rEMKxVabrKxM/IHPW7XHwLCU5cs3tlA7/m4eo9EjzfKvMNcJWf9uHipdCWiGcwm0mpLgyZJSU5ZiwMbhLkEkoU237DrX83sv3vMXDyO0YAOoQx59jJPLZCnWlTbicXOMfgRL4Qj2hTCXZzHyKPL1g8f0v44+0fNSoY8ep1Pmdh3x7RNqDj7mBgIIdlX5LoDXFalEnG5q9L39qVctgg8sQERldJ/Bb5pc= 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 Sat, Jan 10, 2026 at 02:26:19PM +1030, Qu Wenruo wrote: > Furthermore read_cache_page*() can race with device block size setting, > thus requires extra locking. What? There's supposed to be sufficient locking to prevent this. Is there a bug report I can look at?