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charset="utf-8" It is so far expected that the limits passed are valid. In future atomic writes will be supported for stacked block devices, and calculating the limits there will be complicated, so add extra sanity checks to ensure that the values are always valid. Reviewed-by: Christoph Hellwig Signed-off-by: John Garry Reviewed-by: Martin K. Petersen --- block/blk-settings.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index f1d4dfdc37a7..cdfebbd5f571 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -178,9 +178,26 @@ static void blk_validate_atomic_write_limits(struct qu= eue_limits *lim) if (!lim->atomic_write_hw_max) goto unsupported; =20 + if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_min))) + goto unsupported; + + if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_max))) + goto unsupported; + + if (WARN_ON_ONCE(lim->atomic_write_hw_unit_min > + lim->atomic_write_hw_unit_max)) + goto unsupported; + + if (WARN_ON_ONCE(lim->atomic_write_hw_unit_max > + lim->atomic_write_hw_max)) + goto unsupported; + boundary_sectors =3D lim->atomic_write_hw_boundary >> SECTOR_SHIFT; =20 if (boundary_sectors) { + if (WARN_ON_ONCE(lim->atomic_write_hw_max > + lim->atomic_write_hw_boundary)) + goto unsupported; /* * A feature of boundary support is that it disallows bios to * be merged which would result in a merged request which --=20 2.31.1 From nobody Sat Nov 23 14:49:01 2024 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (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 62E912B2F2; 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charset="utf-8" Allow stacked devices to support atomic writes by aggregating the minimum capability of all bottom devices. Flag BLK_FEAT_ATOMIC_WRITES_STACKED is set for stacked devices which have been enabled to support atomic writes. Some things to note on the implementation: - For simplicity, all bottom devices must have same atomic write boundary value (if any) - The atomic write boundary must be a power-of-2 already, but this restriction could be relaxed. Furthermore, it is now required that the chunk sectors for a top device must be aligned with this boundary. - If a bottom device atomic write unit min/max are not aligned with the top device chunk sectors, the top device atomic write unit min/max are reduced to a value which works for the chunk sectors. Reviewed-by: Christoph Hellwig Signed-off-by: John Garry Reviewed-by: Martin K. Petersen --- block/blk-settings.c | 115 +++++++++++++++++++++++++++++++++++++++++ include/linux/blkdev.h | 4 ++ 2 files changed, 119 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index cdfebbd5f571..f7368c29424c 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -496,6 +496,119 @@ static unsigned int blk_round_down_sectors(unsigned i= nt sectors, unsigned int lb return sectors; } =20 +/* Check if second and later bottom devices are compliant */ +static bool blk_stack_atomic_writes_tail(struct queue_limits *t, + struct queue_limits *b) +{ + /* We're not going to support different boundary sizes.. yet */ + if (t->atomic_write_hw_boundary !=3D b->atomic_write_hw_boundary) + return false; + + /* Can't support this */ + if (t->atomic_write_hw_unit_min > b->atomic_write_hw_unit_max) + return false; + + /* Or this */ + if (t->atomic_write_hw_unit_max < b->atomic_write_hw_unit_min) + return false; + + t->atomic_write_hw_max =3D min(t->atomic_write_hw_max, + b->atomic_write_hw_max); + t->atomic_write_hw_unit_min =3D max(t->atomic_write_hw_unit_min, + b->atomic_write_hw_unit_min); + t->atomic_write_hw_unit_max =3D min(t->atomic_write_hw_unit_max, + b->atomic_write_hw_unit_max); + return true; +} + +/* Check for valid boundary of first bottom device */ +static bool blk_stack_atomic_writes_boundary_head(struct queue_limits *t, + struct queue_limits *b) +{ + /* + * Ensure atomic write boundary is aligned with chunk sectors. Stacked + * devices store chunk sectors in t->io_min. + */ + if (b->atomic_write_hw_boundary > t->io_min && + b->atomic_write_hw_boundary % t->io_min) + return false; + if (t->io_min > b->atomic_write_hw_boundary && + t->io_min % b->atomic_write_hw_boundary) + return false; + + t->atomic_write_hw_boundary =3D b->atomic_write_hw_boundary; + return true; +} + + +/* Check stacking of first bottom device */ +static bool blk_stack_atomic_writes_head(struct queue_limits *t, + struct queue_limits *b) +{ + if (b->atomic_write_hw_boundary && + !blk_stack_atomic_writes_boundary_head(t, b)) + return false; + + if (t->io_min <=3D SECTOR_SIZE) { + /* No chunk sectors, so use bottom device values directly */ + t->atomic_write_hw_unit_max =3D b->atomic_write_hw_unit_max; + t->atomic_write_hw_unit_min =3D b->atomic_write_hw_unit_min; + t->atomic_write_hw_max =3D b->atomic_write_hw_max; + return true; + } + + /* + * Find values for limits which work for chunk size. + * b->atomic_write_hw_unit_{min, max} may not be aligned with chunk + * size (t->io_min), as chunk size is not restricted to a power-of-2. + * So we need to find highest power-of-2 which works for the chunk + * size. + * As an example scenario, we could have b->unit_max =3D 16K and + * t->io_min =3D 24K. For this case, reduce t->unit_max to a value + * aligned with both limits, i.e. 8K in this example. + */ + t->atomic_write_hw_unit_max =3D b->atomic_write_hw_unit_max; + while (t->io_min % t->atomic_write_hw_unit_max) + t->atomic_write_hw_unit_max /=3D 2; + + t->atomic_write_hw_unit_min =3D min(b->atomic_write_hw_unit_min, + t->atomic_write_hw_unit_max); + t->atomic_write_hw_max =3D min(b->atomic_write_hw_max, t->io_min); + + return true; +} + +static void blk_stack_atomic_writes_limits(struct queue_limits *t, + struct queue_limits *b) +{ + if (!(t->features & BLK_FEAT_ATOMIC_WRITES_STACKED)) + goto unsupported; + + if (!b->atomic_write_unit_min) + goto unsupported; + + /* + * If atomic_write_hw_max is set, we have already stacked 1x bottom + * device, so check for compliance. + */ + if (t->atomic_write_hw_max) { + if (!blk_stack_atomic_writes_tail(t, b)) + goto unsupported; + return; + } + + if (!blk_stack_atomic_writes_head(t, b)) + goto unsupported; + return; + +unsupported: + t->atomic_write_hw_max =3D 0; 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Mon, 18 Nov 2024 10:50:37 +0000 From: John Garry To: axboe@kernel.dk, song@kernel.org, yukuai3@huawei.com, hch@lst.de Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, martin.petersen@oracle.com, John Garry Subject: [PATCH v5 3/5] md/raid0: Atomic write support Date: Mon, 18 Nov 2024 10:50:16 +0000 Message-Id: <20241118105018.1870052-4-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20241118105018.1870052-1-john.g.garry@oracle.com> References: <20241118105018.1870052-1-john.g.garry@oracle.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SJ0PR03CA0054.namprd03.prod.outlook.com (2603:10b6:a03:33e::29) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|CH3PR10MB6812:EE_ X-MS-Office365-Filtering-Correlation-Id: 3ccf4d45-27f6-4bbf-5fee-08dd07bed5c9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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charset="utf-8" Set BLK_FEAT_ATOMIC_WRITES_STACKED to enable atomic writes. All other stacked device request queue limits should automatically be set properly. With regards to atomic write max bytes limit, this will be set at hw_max_sectors and this is limited by the stripe width, which we want. Reviewed-by: Yu Kuai Signed-off-by: John Garry Reviewed-by: Martin K. Petersen --- drivers/md/raid0.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index baaf5f8b80ae..7049ec7fb8eb 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -384,6 +384,7 @@ static int raid0_set_limits(struct mddev *mddev) lim.max_write_zeroes_sectors =3D mddev->chunk_sectors; lim.io_min =3D mddev->chunk_sectors << 9; lim.io_opt =3D lim.io_min * mddev->raid_disks; + lim.features |=3D BLK_FEAT_ATOMIC_WRITES_STACKED; err =3D mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) { queue_limits_cancel_update(mddev->gendisk->queue); --=20 2.31.1 From nobody Sat Nov 23 14:49:01 2024 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 AA0371991BB; Mon, 18 Nov 2024 10:50:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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charset="utf-8" Set BLK_FEAT_ATOMIC_WRITES_STACKED to enable atomic writes. For an attempt to atomic write to a region which has bad blocks, error the write as we just cannot do this. It is unlikely to find devices which support atomic writes and bad blocks. Reviewed-by: Yu Kuai Signed-off-by: John Garry Reviewed-by: Martin K. Petersen --- drivers/md/raid1.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index a5adf08ee174..519c56f0ee3d 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1571,7 +1571,21 @@ static void raid1_write_request(struct mddev *mddev,= struct bio *bio, continue; } if (is_bad) { - int good_sectors =3D first_bad - r1_bio->sector; + int good_sectors; + + /* + * We cannot atomically write this, so just + * error in that case. It could be possible to + * atomically write other mirrors, but the + * complexity of supporting that is not worth + * the benefit. + */ + if (bio->bi_opf & REQ_ATOMIC) { + error =3D -EIO; + goto err_handle; + } + + good_sectors =3D first_bad - r1_bio->sector; if (good_sectors < max_sectors) max_sectors =3D good_sectors; } @@ -1657,7 +1671,8 @@ static void raid1_write_request(struct mddev *mddev, = struct bio *bio, =20 mbio->bi_iter.bi_sector =3D (r1_bio->sector + rdev->data_offset); mbio->bi_end_io =3D raid1_end_write_request; - mbio->bi_opf =3D bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); + mbio->bi_opf =3D bio_op(bio) | + (bio->bi_opf & (REQ_SYNC | REQ_FUA | REQ_ATOMIC)); if (test_bit(FailFast, &rdev->flags) && !test_bit(WriteMostly, &rdev->flags) && conf->raid_disks - mddev->degraded > 1) @@ -3224,6 +3239,7 @@ static int raid1_set_limits(struct mddev *mddev) =20 md_init_stacking_limits(&lim); lim.max_write_zeroes_sectors =3D 0; + lim.features |=3D BLK_FEAT_ATOMIC_WRITES_STACKED; 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charset="utf-8" Set BLK_FEAT_ATOMIC_WRITES_STACKED to enable atomic writes. For an attempt to atomic write to a region which has bad blocks, error the write as we just cannot do this. It is unlikely to find devices which support atomic writes and bad blocks. Reviewed-by: Yu Kuai Signed-off-by: John Garry Reviewed-by: Martin K. Petersen --- drivers/md/raid10.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 8c7f5daa073a..f779d8225667 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1255,6 +1255,7 @@ static void raid10_write_one_disk(struct mddev *mddev= , struct r10bio *r10_bio, const enum req_op op =3D bio_op(bio); const blk_opf_t do_sync =3D bio->bi_opf & REQ_SYNC; const blk_opf_t do_fua =3D bio->bi_opf & REQ_FUA; + const blk_opf_t do_atomic =3D bio->bi_opf & REQ_ATOMIC; unsigned long flags; struct r10conf *conf =3D mddev->private; struct md_rdev *rdev; @@ -1273,7 +1274,7 @@ static void raid10_write_one_disk(struct mddev *mddev= , struct r10bio *r10_bio, mbio->bi_iter.bi_sector =3D (r10_bio->devs[n_copy].addr + choose_data_offset(r10_bio, rdev)); mbio->bi_end_io =3D raid10_end_write_request; - mbio->bi_opf =3D op | do_sync | do_fua; + mbio->bi_opf =3D op | do_sync | do_fua | do_atomic; if (!replacement && test_bit(FailFast, &conf->mirrors[devnum].rdev->flags) && enough(conf, devnum)) @@ -1468,7 +1469,21 @@ static void raid10_write_request(struct mddev *mddev= , struct bio *bio, continue; } if (is_bad) { - int good_sectors =3D first_bad - dev_sector; + int good_sectors; + + /* + * We cannot atomically write this, so just + * error in that case. It could be possible to + * atomically write other mirrors, but the + * complexity of supporting that is not worth + * the benefit. + */ + if (bio->bi_opf & REQ_ATOMIC) { + error =3D -EIO; + goto err_handle; + } + + good_sectors =3D first_bad - dev_sector; if (good_sectors < max_sectors) max_sectors =3D good_sectors; } @@ -4025,6 +4040,7 @@ static int raid10_set_queue_limits(struct mddev *mdde= v) lim.max_write_zeroes_sectors =3D 0; lim.io_min =3D mddev->chunk_sectors << 9; lim.io_opt =3D lim.io_min * raid10_nr_stripes(conf); + lim.features |=3D BLK_FEAT_ATOMIC_WRITES_STACKED; err =3D mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) { queue_limits_cancel_update(mddev->gendisk->queue); --=20 2.31.1