From patchwork Mon Feb 19 13:01:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 13562629 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0ED32383A6; Mon, 19 Feb 2024 13:02:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.177.32 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708347768; cv=fail; b=Uaw3nW2s75DT8ztiYLpjgcb9wT32ACZWj1mRwTYuit7GbhJ1kX+SNlbeW+79OfrJOzBOqlG0pSENs1Y/5zaF0tHTATqwo7G0petF6/o/jfZBFoMb8/5mD7gh99mYYkBirEqftBhROD3729St1Og/RDduhD+qNgi0ONj8G9T3dDk= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708347768; c=relaxed/simple; bh=uT+Cfio807eeLInUynlSjGeeEzH9oz2qyfwW6Xyf65o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=J0gc9EygehRjGttmbnO0XVVTopAvR2rlkmi+OlpzHYUWXflD4YOCPi/FZBZtQoTO6LeeIuD/c2pu0h1FpuAj59krBbJ1g7JszoorYHw46q6QKT73jH8bwNez6IkSUVTNpplUQOT8491x6Z/LRMxLLghz7/P9SGcSK75rD61q/zo= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=NWoYR8ya; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=d/nzw7aI; arc=fail smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="NWoYR8ya"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="d/nzw7aI" Received: from pps.filterd (m0246632.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 41J8OAVe022474; Mon, 19 Feb 2024 13:01:50 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-2023-11-20; bh=2z/8eSSYabRkF+uqNk0U/lhIklmfGyq2q8zki9qeB9k=; b=NWoYR8yabiql00PLH9af0yAMNnFUYFB9M7wDgrz9J1DjRZlrTW9aIjYxKgmz5NBSBKDI Grgt41VazNfYcxcwQ7mjTCUDQsA00Exy+ZH0KBZuFDFGlT5ZFvwRAkiCiRt5IG+IGAxU qWdB3lkTPC7hMfZEz/ZZjw1GpD+TXWvzyb2T4Qt6B/u9kSvDJay+Mc8ZKF6H0B4SHAAU DtF0DzikNX6WiCYscZKHlAxYpULBS44I4flBe2POvJ6dMT5EgluHsvMrFwEiQRhUlwZB Zb9r+vW03OUbyLxKA/xwi+EV51eNnnsF57nEBEA90N2wBEvLW4ys5BumuGaweXZkh+Yn FQ== Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.appoci.oracle.com [138.1.114.2]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3wamdtv3bx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Feb 2024 13:01:50 +0000 Received: from pps.filterd (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 41JCPHxg013054; Mon, 19 Feb 2024 13:01:49 GMT Received: from nam11-dm6-obe.outbound.protection.outlook.com (mail-dm6nam11lp2168.outbound.protection.outlook.com [104.47.57.168]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3wak85vtss-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Feb 2024 13:01:49 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=S4oA2C00Ge9fVZVI0zscgSrEhruT/yAUoSxMz4wMraiMPrTILUOyF5AqMLWgTY8SfpH42RsU9GZlifYVvdhSbo3bwiefXAJXVRQxjfeI6n51zbMuh7UClAx7U3N1v9U0HXSQlOMQhoCDO6ZsJB4H7BpCcBQevHd4C7TBbGXsy/FdHOouyQ+aPYS7OJLnkD/LoFjq+Ejpg5/JwyJHZlQGrcsBq8BwTtsgouLL8B5sNcQmxvx11ujRYcBIQWaYIkM0QG7AoAAqhUYRQg8zNJrlgdRsB/0waJBkOYPGpcavtxD3oMH7TMTYnbY/OL8iZiHJMZhe/xo0yLlSGGL19/27xA== 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=2z/8eSSYabRkF+uqNk0U/lhIklmfGyq2q8zki9qeB9k=; b=nUlvkAMxUZiffBMoPYOgEYTcrg4IHSdejciIpUJnWDQql7TMnBQazK5KqbVMu7pj7Pf3ttTNsY3vSJwc4tJD3Jdl2el2A9NV3Z1VP44yBEoqHVrqHamRON3RDkHbUrJ0+GH9FmM2XMecKzHpLTR6tcZG8HKK82p+nTVDjJoPl3iq6Wt8RspyWDLKTXmWbkzZwJlmBAAbCabkbGYTdscHIgzIu4WBkTFRbStq2gFawPXExJknITODrYQAXXeIk/9e78Erfsm1cjx0vtUStvw3gm3R1J/xHyICUIqCl5H+bjrgg3SyxWELsqtYzfvtvcAl0yUvL+rLWYjezyzZAF2eNg== 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=2z/8eSSYabRkF+uqNk0U/lhIklmfGyq2q8zki9qeB9k=; b=d/nzw7aI7qnIHls7+O/ulx6u/OQh8ICSD3aGHfNlNnfJ7nqODx+dFAAvqOZCqPkMe5DHtebDqy2K/8v6m6QIsmWhF0PePT9G40Bc4wBhhmibvlqrOIKHbZd3v8Rjh1p6oq6XWoLEee4e/eUURQ8HXGzu1WXIMAovv0574IAN00Q= Received: from DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) by DS0PR10MB6894.namprd10.prod.outlook.com (2603:10b6:8:134::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7292.38; Mon, 19 Feb 2024 13:01:46 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::56f9:2210:db18:61c4]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::56f9:2210:db18:61c4%4]) with mapi id 15.20.7292.036; Mon, 19 Feb 2024 13:01:46 +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, dchinner@redhat.com, jack@suse.cz Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, linux-scsi@vger.kernel.org, ojaswin@linux.ibm.com, linux-aio@kvack.org, linux-btrfs@vger.kernel.org, io-uring@vger.kernel.org, nilay@linux.ibm.com, ritesh.list@gmail.com, John Garry Subject: [PATCH v4 07/11] block: Add fops atomic write support Date: Mon, 19 Feb 2024 13:01:05 +0000 Message-Id: <20240219130109.341523-8-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240219130109.341523-1-john.g.garry@oracle.com> References: <20240219130109.341523-1-john.g.garry@oracle.com> X-ClientProxiedBy: SJ0PR03CA0289.namprd03.prod.outlook.com (2603:10b6:a03:39e::24) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) 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: DM6PR10MB4313:EE_|DS0PR10MB6894:EE_ X-MS-Office365-Filtering-Correlation-Id: d5a34c4a-6fe7-4ef6-d1ff-08dc314aeda6 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)(921011);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: SEfco3GNnYVYKg9fflKq5HK12KZ+NwVCOQ7LfEDcCa+Rvw7eFhx+DbSeYBhcW565ODdCBwfT8A6BCEPmCYwOci4K6BsFXJ4rSp/tdcDqCGV40KP6xrS3hD2Zje3qjGd7E5lBFh8oJ3fg5lK3owALv7ZM50bxGZilkHjWh5ywuEqtWMFndZ7ROC5HMZcQjLgD8tjxOr3u/THxl3X+VwoZIfcE305LZr7l+E+jyUerO4PKv+grNt/A0cBdZ/4j44qi8kVdbXBZ9V6E4DveWoRprYVo8Rof+ui7CHEfgov5TO0vc9bpdkIYG4wDbTCaxfMEEqoihkUvtqql9cEb/ZO43ECA7zZiHU4sC/iJ9u5Sr4Z+r3GktcsQ9IafnpfSRjNiKuBJnuvf3SFpe4qPi5ZumtAsGW6h3+S61CuayO7Teaz6RQKXhA9YblkfbXO85zSK1kyRPaTswQVoJ3kNBwo6dyZZE/7GSzh1E8evc6/l6gTTotHjB9ox0WiqENsOYzhry66fVjLRPf9xRX8oZULxIoZDYbslgmjeqR3wtaG5RqxN9qOdVQqXAXkbgqkUxX7igZq5DsDdW3Q2UtL+TejH7ADXxgAyB3yA4gmNOn+EpDwl02pZ7mK18W/Hg1jE80DxTyLFytX2H5hEZNhED4M3snSiHEOUJU6uWCV7Q+cRDVMBaFL68pJpnoztF0E9V91FXqWmx3JDgtBWbxe0sqKaPYDjPWnv3giOhEv9FCKBjRrN8Vzedkls5g/Es8m+hByQm4Q7FwDCf6DMoliup92YNHs77PPE0kHNAr0L2aODN6TD92QAFwo3P/w3n3Mj3ZhyBwa9Brv1oqWm1XzVpwevmJ2+M0gNGfYmjfvNH5E05uDSjkLjzHr9EMTk0wLLafpZPCxhNodyAxWiUMZLLO28wir1IYmvhRHGqORIRFMzRPv+QlnEVaPfzIJ2sMSnDTOhVsCi2W4sl4PVjPU6dwAuBj4FwPdpy9/dHPPENie/5rDJ4SFWKlV0c+JpmRqHnhoK0g1zxoJ5dRO72r1pFVWmFCIJQHD441rCjm8x5GNxkv2i9gCF4XrZ0bsXJlETvIC/J/fjT52xoFAoQklQRFB/w2HVMIZdFZg3SmRpN5DrG+SaID+bUKLuGzjlGlBu1JQPodFNwnh9kmqQqnhAaxe8NkZLIoeOZMAqX0PlDPd+a8v4Zy+YmYjH6vRMGcIeoPBEgO/Vd/qnIhflkNMtrK1YzNUCuNpv3KO/Hvlx7/mwTBlQ8yGZGwjAELyhg632UGRXi2EpQnZfUVWtEs2ec8ST7vvOFj8vQ6S1MOabWk3rjNqLXm6JLZyUYzd+0Zb4z87+H3aOMtzB2mObngYSw0P9ufdOTeR68Y/VZq1xsp2KzowYIRr6sOcsxkaXs2lrvnPkk0GMyVulExBQava51iJao4jGyKXtSI3NmywYS5cXZDBdt1oQnLEabNT4blWwE0vgSsQKmd4UUcle48SCfCjjO1btr8bf8rKTgIsY1F5RGK6fzb8fl5TSViBB3gXtfCtgJ92+NEClcLVJfW2HWBE6y7IVMQqgMv34LZiN9DrzD08BGsnsp6qq+UtFalc7Rfk8ggc8QwdwBGwfqZ9qmm1VhA== X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: d5a34c4a-6fe7-4ef6-d1ff-08dc314aeda6 X-MS-Exchange-CrossTenant-AuthSource: DM6PR10MB4313.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Feb 2024 13:01:46.5694 (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: aRmnCAcJWs6PrPwyjKfGdIFlU/2QTkBTDnzJSheI2x8lHgKLw50/D/IteU9xnLs9bm6X4/AmkoMqfbC9SAkzSQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR10MB6894 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-19_09,2024-02-19_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 bulkscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402190096 X-Proofpoint-GUID: n2dauEaZCTSIuI2_iot595EEUVaHbAT- X-Proofpoint-ORIG-GUID: n2dauEaZCTSIuI2_iot595EEUVaHbAT- Support atomic writes by submitting a single BIO with the REQ_ATOMIC set. It must be ensured that the atomic write adheres to its rules, like naturally aligned offset, so call blkdev_dio_invalid() -> blkdev_atomic_write_valid() [with renaming blkdev_dio_unaligned() to blkdev_dio_invalid()] for this purpose. In blkdev_direct_IO(), if the nr_pages exceeds BIO_MAX_VECS, then we cannot produce a single BIO, so error in this case. Finally set FMODE_CAN_ATOMIC_WRITE when the bdev can support atomic writes and the associated file flag is for O_DIRECT. Signed-off-by: John Garry --- block/fops.c | 31 ++++++++++++++++++++++++++++--- 1 file changed, 28 insertions(+), 3 deletions(-) diff --git a/block/fops.c b/block/fops.c index 28382b4d097a..563189c2fc5a 100644 --- a/block/fops.c +++ b/block/fops.c @@ -34,13 +34,27 @@ static blk_opf_t dio_bio_write_op(struct kiocb *iocb) return opf; } -static bool blkdev_dio_unaligned(struct block_device *bdev, loff_t pos, - struct iov_iter *iter) +static bool blkdev_atomic_write_valid(struct block_device *bdev, loff_t pos, + struct iov_iter *iter) { + struct request_queue *q = bdev_get_queue(bdev); + unsigned int min_bytes = queue_atomic_write_unit_min_bytes(q); + unsigned int max_bytes = queue_atomic_write_unit_max_bytes(q); + + return atomic_write_valid(pos, iter, min_bytes, max_bytes); +} + +static bool blkdev_dio_invalid(struct block_device *bdev, loff_t pos, + struct iov_iter *iter, bool atomic_write) +{ + if (atomic_write && !blkdev_atomic_write_valid(bdev, pos, iter)) + return true; + return pos & (bdev_logical_block_size(bdev) - 1) || !bdev_iter_is_aligned(bdev, iter); } + #define DIO_INLINE_BIO_VECS 4 static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, @@ -71,6 +85,8 @@ 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 (iocb->ki_flags & IOCB_ATOMIC) + bio.bi_opf |= REQ_ATOMIC; ret = bio_iov_iter_get_pages(&bio, iter); if (unlikely(ret)) @@ -341,6 +357,9 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb, task_io_account_write(bio->bi_iter.bi_size); } + if (iocb->ki_flags & IOCB_ATOMIC) + bio->bi_opf |= REQ_ATOMIC; + if (iocb->ki_flags & IOCB_NOWAIT) bio->bi_opf |= REQ_NOWAIT; @@ -357,13 +376,14 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb, static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host); + bool atomic_write = iocb->ki_flags & IOCB_ATOMIC; loff_t pos = iocb->ki_pos; unsigned int nr_pages; if (!iov_iter_count(iter)) return 0; - if (blkdev_dio_unaligned(bdev, pos, iter)) + if (blkdev_dio_invalid(bdev, pos, iter, atomic_write)) return -EINVAL; nr_pages = bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS + 1); @@ -371,6 +391,8 @@ static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter) if (is_sync_kiocb(iocb)) return __blkdev_direct_IO_simple(iocb, iter, nr_pages); return __blkdev_direct_IO_async(iocb, iter, nr_pages); + } else if (atomic_write) { + return -EINVAL; } return __blkdev_direct_IO(iocb, iter, bio_max_segs(nr_pages)); } @@ -616,6 +638,9 @@ static int blkdev_open(struct inode *inode, struct file *filp) if (bdev_nowait(handle->bdev)) filp->f_mode |= FMODE_NOWAIT; + if (bdev_can_atomic_write(handle->bdev) && filp->f_flags & O_DIRECT) + filp->f_mode |= FMODE_CAN_ATOMIC_WRITE; + filp->f_mapping = handle->bdev->bd_inode->i_mapping; filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping); filp->private_data = handle;