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Tue, 3 Sep 2024 15:08:20 +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 15:08:19 +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 3/4] block: Support atomic writes limits for stacked devices Date: Tue, 3 Sep 2024 15:07:47 +0000 Message-Id: <20240903150748.2179966-4-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: BYAPR07CA0041.namprd07.prod.outlook.com (2603:10b6:a03:60::18) To CH2PR10MB4312.namprd10.prod.outlook.com (2603:10b6:610:7b::9) Precedence: bulk X-Mailing-List: linux-raid@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: f74425ae-e542-419a-db15-08dccc2a3ee9 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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If a bottom device does not support atomic writes, then BLK_FEAT_ATOMIC_WRITES should be cleared for that device, and the top device then will also not support atomic writes. Signed-off-by: John Garry --- block/blk-settings.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index 036e67f73116..aeb05fb24801 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -682,6 +682,25 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, t->zone_write_granularity = 0; t->max_zone_append_sectors = 0; } + if (!(b->features & BLK_FEAT_ATOMIC_WRITES)) { + t->atomic_write_hw_max = 0; + t->atomic_write_hw_unit_max = 0; + t->atomic_write_hw_unit_min = 0; + t->atomic_write_hw_boundary = 0; + t->features &= ~BLK_FEAT_ATOMIC_WRITES; + } else if (t->features & BLK_FEAT_ATOMIC_WRITES) { + t->atomic_write_hw_max = min_not_zero(t->atomic_write_hw_max, + b->atomic_write_hw_max); + t->atomic_write_boundary_sectors = + min_not_zero(t->atomic_write_boundary_sectors, + b->atomic_write_boundary_sectors); + t->atomic_write_hw_unit_min = max(t->atomic_write_hw_unit_min, + b->atomic_write_hw_unit_min); + t->atomic_write_hw_unit_max = + min_not_zero(t->atomic_write_hw_unit_max, + b->atomic_write_hw_unit_max); + } + return ret; } EXPORT_SYMBOL(blk_stack_limits);