linux-kernel - [PATCH v3 4/5] dm-stripe: limit chunk

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Message-ID: <20250703114613.9124-5-john.g.garry@oracle.com>
Date: Thu,  3 Jul 2025 11:46:12 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com,
        song@...nel.org, yukuai3@...wei.com, hch@....de, nilay@...ux.ibm.com
Cc: dm-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, linux-block@...r.kernel.org,
        ojaswin@...ux.ibm.com, martin.petersen@...cle.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH v3 4/5] dm-stripe: limit chunk_sectors to the stripe size

Same as done for raid0, set chunk_sectors limit to appropriately set the
atomic write size limit.

Setting chunk_sectors limit in this way overrides the stacked limit
already calculated based on the bottom device limits. This is ok, as
when any bios are sent to the bottom devices, the block layer will still
respect the bottom device chunk_sectors.

Reviewed-by: Nilay Shroff <nilay@...ux.ibm.com>
Reviewed-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 drivers/md/dm-stripe.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index a1b7535c508a..8f61030d3b2d 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -459,6 +459,7 @@ static void stripe_io_hints(struct dm_target *ti,
 	struct stripe_c *sc = ti->private;
 	unsigned int chunk_size = sc->chunk_size << SECTOR_SHIFT;
 
+	limits->chunk_sectors = sc->chunk_size;
 	limits->io_min = chunk_size;
 	limits->io_opt = chunk_size * sc->stripes;
 }
-- 
2.43.5