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Fri, 29 Sep 2023 10:28:00 +0000 From: John Garry To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, jejb@linux.ibm.com, martin.petersen@oracle.com, djwong@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, chandan.babu@oracle.com, dchinner@redhat.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, linux-api@vger.kernel.org, John Garry Subject: [PATCH 02/21] block: Limit atomic writes according to bio and queue limits Date: Fri, 29 Sep 2023 10:27:07 +0000 Message-Id: <20230929102726.2985188-3-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230929102726.2985188-1-john.g.garry@oracle.com> References: <20230929102726.2985188-1-john.g.garry@oracle.com> X-ClientProxiedBy: PH7PR10CA0011.namprd10.prod.outlook.com (2603:10b6:510:23d::12) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|PH7PR10MB6153:EE_ X-MS-Office365-Filtering-Correlation-Id: 95cb4a4b-7fe6-4547-9df5-08dbc0d6c107 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Fri, 29 Sep 2023 03:29:07 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778383766474132808 X-GMAIL-MSGID: 1778383766474132808 We rely the block layer always being able to send a bio of size atomic_write_unit_max without being required to split it due to request queue or other bio limits. A bio may contain min(BIO_MAX_VECS, limits->max_segments) vectors, and each vector is at worst case the device logical block size from direct IO alignment requirement. Signed-off-by: John Garry --- block/blk-settings.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/block/blk-settings.c b/block/blk-settings.c index d151be394c98..57d487a00c64 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -213,6 +213,18 @@ void blk_queue_atomic_write_boundary_bytes(struct request_queue *q, } EXPORT_SYMBOL(blk_queue_atomic_write_boundary_bytes); +static unsigned int blk_queue_max_guaranteed_bio_size_sectors( + struct request_queue *q) +{ + struct queue_limits *limits = &q->limits; + unsigned int max_segments = min_t(unsigned int, BIO_MAX_VECS, + limits->max_segments); + /* Limit according to dev sector size as we only support direct-io */ + unsigned int limit = max_segments * queue_logical_block_size(q); + + return rounddown_pow_of_two(limit >> SECTOR_SHIFT); +} + /** * blk_queue_atomic_write_unit_min_sectors - smallest unit that can be written * atomically to the device. @@ -223,8 +235,10 @@ void blk_queue_atomic_write_unit_min_sectors(struct request_queue *q, unsigned int sectors) { struct queue_limits *limits = &q->limits; + unsigned int guaranteed_sectors = + blk_queue_max_guaranteed_bio_size_sectors(q); - limits->atomic_write_unit_min_sectors = sectors; + limits->atomic_write_unit_min_sectors = min(guaranteed_sectors, sectors); } EXPORT_SYMBOL(blk_queue_atomic_write_unit_min_sectors); @@ -238,8 +252,10 @@ void blk_queue_atomic_write_unit_max_sectors(struct request_queue *q, unsigned int sectors) { struct queue_limits *limits = &q->limits; + unsigned int guaranteed_sectors = + blk_queue_max_guaranteed_bio_size_sectors(q); - limits->atomic_write_unit_max_sectors = sectors; + limits->atomic_write_unit_max_sectors = min(guaranteed_sectors, sectors); } EXPORT_SYMBOL(blk_queue_atomic_write_unit_max_sectors);