From patchwork Fri Sep 29 10:27:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13404042 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3F44E7F154 for ; Fri, 29 Sep 2023 10:34:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233058AbjI2KeE (ORCPT ); Fri, 29 Sep 2023 06:34:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233165AbjI2KdP (ORCPT ); Fri, 29 Sep 2023 06:33:15 -0400 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B6D31BEB; Fri, 29 Sep 2023 03:31:35 -0700 (PDT) Received: from pps.filterd (m0246617.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38SK9Qm4019170; Fri, 29 Sep 2023 10:28:51 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-transfer-encoding : content-type : mime-version; s=corp-2023-03-30; bh=6dpfvd4QexpFHlVLo6uba8WrCzFwMvYjqBcVe1g0GAU=; b=M05FVCy6ewd+ln/Y7Xow+rhOvmeL+Z2fLi0sVsDKCgdRcfDt6dy0ffTspj0KQHxvC5LO 949zI3gHw6v8GP1t/BaOH8EEd2bMXQRFZSa4LidSrehcrKVSeE/74ysdIrLGQ3uWuYiU g6r61j2kjGNGY9iiyEjx3DjWgzn1ZwLVqODGPihtboJH4e9SPC5qJ+Jj9/zEIv7pv3oZ rEB/cLf3bSWWAV3zs/BaacmHnKj/EJL2VH9UCrRVxyaPPsmVEF+rajK06jW09qdei15K d4ebNBNjW3VEVMiPiRmsh0SdCJuAJxfv+Z8FQImF9ETa24ZRFlzVeE3zDgDmoumJwqii HA== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3t9rjupeug-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 29 Sep 2023 10:28:51 +0000 Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 38T81dGq004840; Fri, 29 Sep 2023 10:28:50 GMT Received: from nam10-bn7-obe.outbound.protection.outlook.com (mail-bn7nam10lp2109.outbound.protection.outlook.com [104.47.70.109]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3t9pfbj374-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 29 Sep 2023 10:28:50 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=kE95REGDQiyxCRUi8MAjAQYegi+DSBenwCP6U4+gFADN7HMoULFh+uNUgWKYEAy3ycsu37u5aNLF0YqW62tYAE2GE/4rdiOZcnmjLoJGSLUUQ9b0EwvBq3MCrm1XKIBDOtptWvJyDpe/+i9ArUkZ3wwwoeoSjKp5iLq3eutPCDC+nkxCL981f6dI2bOFUKa8iOOEnA+Gt3Rrt1Iibf2IeB7dIPPiSUQ/XOWYFgp3GSW/FrhvkhyJMI/UWwaCz3Ip4TGk5931GDSaFVExQXA+HoX8WLD6hIat412zpm1yZ3YDgXe8cf/3tzGQ/aDgvwqWU0UQH29UJmj6SGozVHZXRA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=6dpfvd4QexpFHlVLo6uba8WrCzFwMvYjqBcVe1g0GAU=; b=O8uJBAVFSXQDKa9hVySNzSmDO81HfkQ+NsRCC/86/ON3aJ/Vo4JZbTvwc1ZOA2akYRHo0stiytWZFuTkAjinR1IwwS4MhkQ42yHq1lJp+dWKYrw7YCruB34X81EB4u9E4smPPVU9vMXuJy1paX8mZ1K3j8Q7GNlyi+gwC/AUVJdGmqhQ6/g7pEuwWGq2/ylSda3dnhYE5XQzHCkqSLA3TEXwedr5ItWjm0r8dqcqNjVxG1SCxoCwwVfMfoG33vEJB6FSeK2ZbGEi9HN4E3LEuUY3Di6YY7yelpALQpR8kZPsvjbGSbI+a/ML6j0vcjesKxKfpVQykxMpfC7WKLDg8g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=6dpfvd4QexpFHlVLo6uba8WrCzFwMvYjqBcVe1g0GAU=; b=YRC3+yRXt+Szk6WXUVUpi6aHbAlY0CAU718tJ+y4l0zaAGEb6pHwRan1PhnpLMU5qXarf6ZlBqTrEEXQpthQ+Cg1ue8QRMyXrTioqFzJTUc+SwLQujbqYUwhrGc164Wz+2Ss0/uKqU1nh1flUyAeN9OvM4dyWujiLmfwtOSAE8o= Received: from DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) by PH7PR10MB6153.namprd10.prod.outlook.com (2603:10b6:510:1f7::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6813.28; Fri, 29 Sep 2023 10:28:19 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::ebfd:c49c:6b8:6fce]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::ebfd:c49c:6b8:6fce%7]) with mapi id 15.20.6813.027; Fri, 29 Sep 2023 10:28:19 +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 10/21] block: Add fops atomic write support Date: Fri, 29 Sep 2023 10:27:15 +0000 Message-Id: <20230929102726.2985188-11-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: PH0P220CA0001.NAMP220.PROD.OUTLOOK.COM (2603:10b6:510:d3::6) 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: 6fbf8b5a-a925-4b5d-15f6-08dbc0d6cc91 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR10MB4313.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(136003)(39860400002)(366004)(346002)(376002)(396003)(230922051799003)(186009)(64100799003)(1800799009)(451199024)(6506007)(6512007)(921005)(107886003)(1076003)(26005)(2616005)(8936002)(4326008)(36756003)(103116003)(66556008)(7416002)(2906002)(5660300002)(41300700001)(66946007)(86362001)(316002)(8676002)(66476007)(6666004)(478600001)(38100700002)(6486002)(83380400001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: gQFdOk/9oZLWb1GAG3V5gbDXlfjR3Kq74SuvSz5RWeWk1EA2Q0lbl06w7fEFNJTRmCQ3JkPUv/hRhdH+da6ENdg4tvrx5I8Iqq1aRXGjnfFz8i/prGyfujejVNmzUUZpA+UsmeK+S6mj7q9uUWSiZYzaRdAvpVSbVDvnlDadFHAvC6//XHLle20DtDiSNceUSHkEC4c5GTe1NRY7m7+t4yE13QDtTXkcdtGESj9PuP60ISRwVvMnbreEIe0CIHDrqGDslHVMkv3QPDHzoSDgnqGLvNxOLfuwMnnaVlULWtgdOTQAfq3AHttfI3GLQg83Z23ixDHyvpkh+2+d82euEvgHoljP9nWQdU7cY+yUP9okA1sYGyniHa+HqeoczDqevQm1pbjcn/Q72GiCdLFFScQ0ZJ8rl0iPry/h6VNcA0kpc+G+EAP5pvkmsXIAlQAUzTeUnIXNZ//Wj6Q8khTsig8zYkRTHdhCqk/xdH1dLC7oZT9GabZjVamwWrtY3JGn/Gw8Xy0Czi2NxpWMFBWYZChp46jl03t6o5WJA+xZ1NKnxeCBR6+S9GuRVjwQ3muyg1irPSpRHky77h53jWuguyBsQeKKFKLWBvJT3CNiPEMmHHxX2tkdHLwCysjJC9TDoYdCvwb+WpyF4A89WCv3Q7Rznt9qDKuokjGy9N/StBS+pTC9TZLIvX/g7zCl6jd+FdsPhO/U7nN7mvCCyIzdzFAHrfoZlfcytKIuNuGJ4GP0x6EWzFCQnL1GrBt39CbdW2RW31PHykq8BAT+dhmH8E0iAPVkiKQnGqIz1t41Wt8smlxorcZkQpKl+s0I6Y0tyXVIDM37zufYmJSxwGWU3dGo/VtR8wtrOWGodjjM7kJ83Sjk7ZoTcok6r52SRBXvE69AHUU3JqB90YB7FkptqIAZy+p9VmN32mkn9T/0whgTpdTG/uwuHYpNMBHwdDZplE9l/V3TlRHKViYN3oYD8wuQS2SbcIvSOIORYIEjekOHlEXyH2ignuwz8oErJaYfsq7n33pnel3tJdRHZY6ihB5QNwesSVbNcpbmJsl/g8fqFCG/WmiEoH6OTdp6QVRif4XTTWw4736VCTuaXJE7rkqM6cx60dW7obc6tGlKnLXdlk5BH5JjOf+QSmw2ke+TbhcPyvdjUW4xyfDXM4a/5zYm3RfTcnpQiHyp+xdO0xXfbBwGnGPwSTdGIsUB/PrV7PW5YgBHqNM53HmpCK5dnBFQDquh9CcbnswEKQNHGcVf1VvMMWGfSZFB6cZQoR0qTP6Vlnu29dlJVzpWY/3twJGXkIgEOT2T5FGiUinnXsO+GwlTzw4abvs3en/lc56sAuUYFtCoxzOpU6Q3OdHWdKbIPU3Wkq0ooUZ77nZAHpWhYq1z1nyYHqxIDfMUWRmMAgfCjebgncaW4b5tJ0m6ayvjONoFpvGdrt7EQgipHw6GxLlIGaJGeeQ+bi0o+La2/sxPiOxUKF/hb1UceRxZa405rE6NzTcmS1gpzKG87TtPXS/EGwB+a/nytC/GrA9HQHPh+sFrbaeeRRZQOAXHTr5hMYJ7Z4lk5NYwLUtgGV6FjmWCLoUXOXPAwaOc+KnUG9720zVHAaPR6uwL1pLu4g== X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: FV/zhekTmLuYgdqBbaa6GMckie0YXad1pYgw7PwrLUyrBfRM7f1fxasc8vxhPjaVSEB1pERO1ldI+bgvnStcoj3NQ6mKygbx/CSowr/0Ozw8Co8wMqBWJtQGzAtNc30xc8n1uStOVuPOaX/Ek04bttCOLsyja5yOMWytc9fOvRBz9kIqgBBPUi335youWP7PM5QBvhnYjPZQ39rACPY9TBV2Ajd+brae/nuxJOePcplrpS+ecwY1s7pWtUVXNDeUc4jXkDsMllYhbT+seqZYH2fgSnMOC4PjDUfynmwSrZ93rgCYFN74m5QLtE+DAneh4SS8wXauvAYYWBUb5WTgPQi8ONNRBO1fHkgjYC8kvdoQKLaELYg6g3SrpKGIuVJ9b83TqXn2jRzt6OvZ4l8HoQKefHWnfvOQwfrvJZuVPeNLm6jK3dRuPKGXXxJ3eb3Pj/wADQc3WIlpEzjEvaYNJNYSUIbWrRRG4AMsiATv2SpUNgxpPancSAiZ75AwDF40HSTzC7kY2GKC3rBR9xXfKDI0XbqHBJoUOq08RCz6MNLjV53Thl73/ZbzHxx8i88qBluznSkt8iSOfZUxYmBd1G9bWJzzbTXsgcddurbRBb6S8hL20e7nX0syfCCVx9lviDR3Q+xxgp4gF1291OxvIjgPkyPtdKpusq01+u8Gdb1O+G/EqVO26gA3IIdd/7PaQXLCEipTJ8ApuYn33LijiU5PIofvO7/rpeP5wPA+pnKj75uxcaRM7+vO8X3MFKQjiEzfdPPKMJ0zoTXoIFuS4ROYtZh0Wb+37/xPb1Xg5RaXmdDWU7HD0KrQzIXknHCZ3Ba3TD94ghOCHM8r/GkQKSolM5ntL/p3LWrT8DzJR+q6Kj61JWgT5RPzPWIYxMvhE0aZd2GGXAtIAed1BtaaiJ8GpwqClBckSf60Y/8QgSm6wxTtFE1o4LazuOG7i2P9f2U4SwCTXpyuO7IHsldtP4JkkxdlwWoZHno29kQvCxduspupKxEIA8CSEvyWitI06vD0ncqX823xNxdRY0GejTg9dyK83CKPUr/6zBEWVXcaEakO0gHJGId+G1oLVL80ZW2wLVgAY3x3iD6NdsqQnA== X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6fbf8b5a-a925-4b5d-15f6-08dbc0d6cc91 X-MS-Exchange-CrossTenant-AuthSource: DM6PR10MB4313.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Sep 2023 10:28:19.2183 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: adXVzi7vP3Q7EBAfZvzsl5OuCvppN62L4Q89UL0sz61VOeRfuG7MW9HhkQBE6YDIn5/gtjTYmtBN6tXLSfDjlg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR10MB6153 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-09-29_08,2023-09-28_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 bulkscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2309290090 X-Proofpoint-ORIG-GUID: IBwO50uRtkvIDU46NwWnYxSbmDjvVWvT X-Proofpoint-GUID: IBwO50uRtkvIDU46NwWnYxSbmDjvVWvT Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org Add support for atomic writes, as follows: - Ensure that the IO follows all the atomic writes rules, like must be naturally aligned - Set REQ_ATOMIC Signed-off-by: John Garry --- block/fops.c | 42 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 41 insertions(+), 1 deletion(-) diff --git a/block/fops.c b/block/fops.c index acff3d5d22d4..516669ad69e5 100644 --- a/block/fops.c +++ b/block/fops.c @@ -41,6 +41,29 @@ static bool blkdev_dio_unaligned(struct block_device *bdev, loff_t pos, !bdev_iter_is_aligned(bdev, iter); } +static bool blkdev_atomic_write_valid(struct block_device *bdev, loff_t pos, + struct iov_iter *iter) +{ + unsigned int atomic_write_unit_min_bytes = + queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev)); + unsigned int atomic_write_unit_max_bytes = + queue_atomic_write_unit_max_bytes(bdev_get_queue(bdev)); + + if (!atomic_write_unit_min_bytes) + return false; + if (pos % atomic_write_unit_min_bytes) + return false; + if (iov_iter_count(iter) % atomic_write_unit_min_bytes) + return false; + if (!is_power_of_2(iov_iter_count(iter))) + return false; + if (iov_iter_count(iter) > atomic_write_unit_max_bytes) + return false; + if (pos % iov_iter_count(iter)) + return false; + return true; +} + #define DIO_INLINE_BIO_VECS 4 static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, @@ -48,6 +71,8 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, { struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host); struct bio_vec inline_vecs[DIO_INLINE_BIO_VECS], *vecs; + bool is_read = iov_iter_rw(iter) == READ; + bool atomic_write = (iocb->ki_flags & IOCB_ATOMIC) && !is_read; loff_t pos = iocb->ki_pos; bool should_dirty = false; struct bio bio; @@ -56,6 +81,9 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, if (blkdev_dio_unaligned(bdev, pos, iter)) return -EINVAL; + if (atomic_write && !blkdev_atomic_write_valid(bdev, pos, iter)) + return -EINVAL; + if (nr_pages <= DIO_INLINE_BIO_VECS) vecs = inline_vecs; else { @@ -65,7 +93,7 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, return -ENOMEM; } - if (iov_iter_rw(iter) == READ) { + if (is_read) { bio_init(&bio, bdev, vecs, nr_pages, REQ_OP_READ); if (user_backed_iter(iter)) should_dirty = true; @@ -74,6 +102,8 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, } bio.bi_iter.bi_sector = pos >> SECTOR_SHIFT; bio.bi_ioprio = iocb->ki_ioprio; + if (atomic_write) + bio.bi_opf |= REQ_ATOMIC; ret = bio_iov_iter_get_pages(&bio, iter); if (unlikely(ret)) @@ -167,10 +197,14 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, struct blkdev_dio *dio; struct bio *bio; bool is_read = (iov_iter_rw(iter) == READ), is_sync; + bool atomic_write = (iocb->ki_flags & IOCB_ATOMIC) && !is_read; blk_opf_t opf = is_read ? REQ_OP_READ : dio_bio_write_op(iocb); loff_t pos = iocb->ki_pos; int ret = 0; + if (atomic_write) + return -EINVAL; + if (blkdev_dio_unaligned(bdev, pos, iter)) return -EINVAL; @@ -305,6 +339,7 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb, struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host); bool is_read = iov_iter_rw(iter) == READ; blk_opf_t opf = is_read ? REQ_OP_READ : dio_bio_write_op(iocb); + bool atomic_write = (iocb->ki_flags & IOCB_ATOMIC) && !is_read; struct blkdev_dio *dio; struct bio *bio; loff_t pos = iocb->ki_pos; @@ -313,6 +348,9 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb, if (blkdev_dio_unaligned(bdev, pos, iter)) return -EINVAL; + if (atomic_write && !blkdev_atomic_write_valid(bdev, pos, iter)) + return -EINVAL; + if (iocb->ki_flags & IOCB_ALLOC_CACHE) opf |= REQ_ALLOC_CACHE; bio = bio_alloc_bioset(bdev, nr_pages, opf, GFP_KERNEL, @@ -347,6 +385,8 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb, bio_set_pages_dirty(bio); } } else { + if (atomic_write) + bio->bi_opf |= REQ_ATOMIC; task_io_account_write(bio->bi_iter.bi_size); }