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Tue, 3 Sep 2024 15:08:15 +0000 Received: from CH2PR10MB4312.namprd10.prod.outlook.com ([fe80::fd5e:682a:f1ac:d0a2]) by CH2PR10MB4312.namprd10.prod.outlook.com ([fe80::fd5e:682a:f1ac:d0a2%3]) with mapi id 15.20.7918.012; Tue, 3 Sep 2024 15:08:15 +0000 From: John Garry To: axboe@kernel.dk, song@kernel.org, yukuai3@huawei.com, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, John Garry Subject: [PATCH RFC 1/4] block: Make bdev_can_atomic_write() robust against mis-aligned bdev size Date: Tue, 3 Sep 2024 15:07:45 +0000 Message-Id: <20240903150748.2179966-2-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240903150748.2179966-1-john.g.garry@oracle.com> References: <20240903150748.2179966-1-john.g.garry@oracle.com> X-ClientProxiedBy: BYAPR01CA0007.prod.exchangelabs.com (2603:10b6:a02:80::20) To CH2PR10MB4312.namprd10.prod.outlook.com (2603:10b6:610:7b::9) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4312:EE_|LV3PR10MB8105:EE_ X-MS-Office365-Filtering-Correlation-Id: bb6a53c5-dffe-4bf6-9f3e-08dccc2a3c6a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014; 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This could not be tolerated for an atomic write. Ensure that the size of the bdev matches max atomic write unit so that this truncation would never occur. Fixes: 9da3d1e912f3 ("block: Add core atomic write support") Signed-off-by: John Garry --- include/linux/blkdev.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index b7664d593486..af8434e391fa 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1662,6 +1662,9 @@ static inline bool bdev_can_atomic_write(struct block_device *bdev) if (!limits->atomic_write_unit_min) return false; + if (!IS_ALIGNED(bdev_nr_bytes(bdev), limits->atomic_write_unit_max)) + return false; + if (bdev_is_partition(bdev)) { sector_t bd_start_sect = bdev->bd_start_sect; unsigned int alignment =