[PATCH] md: Correctly disable write zeroes for raid 1, 10 and 5

[Damien Le Moal <dlemoal@kernel.org>]

raid1_set_limits(), raid10_set_queue_limits() and raid5_set_limits()
set max_write_zeroes_sectors to 0 to disable write zeroes support.

However, blk_validate_limits() checks that if
max_hw_wzeroes_unmap_sectors is not zero, it must be equal to
max_write_zeroes_sectors. When creating a RAID1, RAID10 or RAID5 array
of block devices that have a non-zero max_hw_wzeroes_unmap_sectors
limit, blk_validate_limits() returns an error resulting in a failure
to start the array.

Fix this by setting max_hw_wzeroes_unmap_sectors to 0 as well in
raid1_set_limits(), raid10_set_queue_limits() and raid5_set_limits().

Fixes: 0c40d7cb5ef3 ("block: introduce max_{hw|user}_wzeroes_unmap_sectors to queue limits")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/md/raid1.c  | 2 ++
 drivers/md/raid10.c | 1 +
 drivers/md/raid5.c  | 1 +
 3 files changed, 4 insertions(+)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 408c26398321..b366438f3c00 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3211,6 +3211,8 @@ static int raid1_set_limits(struct mddev *mddev)
 
 	md_init_stacking_limits(&lim);
 	lim.max_write_zeroes_sectors = 0;
+	lim.max_hw_wzeroes_unmap_sectors = 0;
+
 	lim.features |= BLK_FEAT_ATOMIC_WRITES;
 	err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
 	if (err)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index b60c30bfb6c7..fe3390948326 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4008,6 +4008,7 @@ static int raid10_set_queue_limits(struct mddev *mddev)
 
 	md_init_stacking_limits(&lim);
 	lim.max_write_zeroes_sectors = 0;
+	lim.max_hw_wzeroes_unmap_sectors = 0
 	lim.io_min = mddev->chunk_sectors << 9;
 	lim.chunk_sectors = mddev->chunk_sectors;
 	lim.io_opt = lim.io_min * raid10_nr_stripes(conf);
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 023649fe2476..5f65dd80e2ef 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7732,6 +7732,7 @@ static int raid5_set_limits(struct mddev *mddev)
 	lim.features |= BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE;
 	lim.discard_granularity = stripe;
 	lim.max_write_zeroes_sectors = 0;
+	lim.max_hw_wzeroes_unmap_sectors = 0
 	mddev_stack_rdev_limits(mddev, &lim, 0);
 	rdev_for_each(rdev, mddev)
 		queue_limits_stack_bdev(&lim, rdev->bdev, rdev->new_data_offset,
-- 
2.51.0