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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. Signed-off-by: John Garry Reviewed-by: Christoph Hellwig --- block/blk-settings.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index a446654ddee5..1642e65a6521 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -179,9 +179,26 @@ 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; 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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. Signed-off-by: John Garry --- block/blk-settings.c | 89 ++++++++++++++++++++++++++++++++++++++++++ include/linux/blkdev.h | 4 ++ 2 files changed, 93 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index 1642e65a6521..6a900ef86e5a 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -496,6 +496,93 @@ static unsigned int blk_round_down_sectors(unsigned in= t sectors, unsigned int lb return sectors; } =20 +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) { + /* We're not going to support different boundary sizes.. yet */ + if (t->atomic_write_hw_boundary !=3D b->atomic_write_hw_boundary) + goto unsupported; + + /* Can't support this */ + if (t->atomic_write_hw_unit_min > b->atomic_write_hw_unit_max) + goto unsupported; + + /* Or this */ + if (t->atomic_write_hw_unit_max < b->atomic_write_hw_unit_min) + goto unsupported; + + 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; + } + + /* Check first bottom device limits */ + if (!b->atomic_write_hw_boundary) + goto check_unit; + /* + * 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) + goto unsupported; + else if (t->io_min > b->atomic_write_hw_boundary && + t->io_min % b->atomic_write_hw_boundary) + goto unsupported; + + t->atomic_write_hw_boundary =3D b->atomic_write_hw_boundary; + +check_unit: + 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; + } + + /* + * 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; + +unsupported: + t->atomic_write_hw_max =3D 0; + t->atomic_write_hw_unit_max =3D 0; + t->atomic_write_hw_unit_min =3D 0; + t->atomic_write_hw_boundary =3D 0; + t->features &=3D ~BLK_FEAT_ATOMIC_WRITES_STACKED; +} + /** * blk_stack_limits - adjust queue_limits for stacked devices * @t: the stacking driver limits (top device) @@ -656,6 +743,8 @@ int blk_stack_limits(struct queue_limits *t, struct que= ue_limits *b, t->zone_write_granularity =3D 0; t->max_zone_append_sectors =3D 0; } + blk_stack_atomic_writes_limits(t, b); + return ret; } EXPORT_SYMBOL(blk_stack_limits); 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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. Signed-off-by: John Garry --- 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 Mon Nov 25 02:28:44 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 5CDAF47F69; Wed, 30 Oct 2024 09:52:14 +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. Signed-off-by: John Garry --- drivers/md/raid1.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index a10018282629..b57f69e3e8a7 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1524,6 +1524,13 @@ static void raid1_write_request(struct mddev *mddev,= struct bio *bio, blocked_rdev =3D rdev; break; } + + if (is_bad && bio->bi_opf & REQ_ATOMIC) { + /* We just cannot atomically write this ... */ + error =3D -EFAULT; + goto err_handle; + } + if (is_bad && first_bad <=3D r1_bio->sector) { /* Cannot write here at all */ bad_sectors -=3D (r1_bio->sector - first_bad); @@ -3220,6 +3227,7 @@ 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; 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 Mon Nov 25 02:28:44 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 A1679199E89; 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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. Signed-off-by: John Garry --- drivers/md/raid10.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 9c56b27b754a..aacd8c3381f5 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1454,6 +1454,13 @@ static void raid10_write_request(struct mddev *mddev= , struct bio *bio, =20 is_bad =3D is_badblock(rdev, dev_sector, max_sectors, &first_bad, &bad_sectors); + + if (is_bad && bio->bi_opf & REQ_ATOMIC) { + /* We just cannot atomically write this ... */ + error =3D -EFAULT; + goto err_handle; + } + if (is_bad && first_bad <=3D dev_sector) { /* Cannot write here at all */ bad_sectors -=3D (dev_sector - first_bad); @@ -4029,6 +4036,7 @@ 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