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Fri, 10 Jan 2025 06:01:27 +0000 Received: from DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::953f:2f80:90c5:67fe]) by DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::953f:2f80:90c5:67fe%7]) with mapi id 15.20.8335.011; Fri, 10 Jan 2025 06:01:27 +0000 From: Alistair Popple To: akpm@linux-foundation.org, dan.j.williams@intel.com, linux-mm@kvack.org Cc: alison.schofield@intel.com, Alistair Popple , lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, david@redhat.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com, chenhuacai@kernel.org, kernel@xen0n.name, loongarch@lists.linux.dev Subject: [PATCH v6 02/26] fs/dax: Return unmapped busy pages from dax_layout_busy_page_range() Date: Fri, 10 Jan 2025 17:00:30 +1100 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SYCPR01CA0034.ausprd01.prod.outlook.com (2603:10c6:10:e::22) To DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB7726:EE_|BY5PR12MB4132:EE_ X-MS-Office365-Filtering-Correlation-Id: b730bb22-f970-4dea-bba5-08dd313c38c1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|366016; 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Currently it checks to see the file mapping is mapped into user-space with mapping_mapped() and returns early if not, skipping the check for DMA busy pages. This is wrong as pages may still be undergoing DMA access even if they have subsequently been unmapped from user-space. Fix this by dropping the check for mapping_mapped(). Signed-off-by: Alistair Popple Suggested-by: Dan Williams Reviewed-by: Dan Williams --- fs/dax.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/dax.c b/fs/dax.c index 21b4740..5133568 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -690,7 +690,7 @@ struct page *dax_layout_busy_page_range(struct address_space *mapping, if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) return NULL; - if (!dax_mapping(mapping) || !mapping_mapped(mapping)) + if (!dax_mapping(mapping)) return NULL; /* If end == LLONG_MAX, all pages from start to till end of file */ -- git-series 0.9.1