linux-kernel - [PATCH RFC v2 6/8] dm-stripe: Enable atomic writes

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Message-Id: <20250116170301.474130-7-john.g.garry@oracle.com>
Date: Thu, 16 Jan 2025 17:02:59 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, agk@...hat.com, mpatocka@...hat.com, hch@....de
Cc: song@...nel.org, yukuai3@...wei.com, kbusch@...nel.org, sagi@...mberg.me,
        James.Bottomley@...senPartnership.com, martin.petersen@...cle.com,
        linux-block@...r.kernel.org, dm-devel@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH RFC v2 6/8] dm-stripe: Enable atomic writes

Set feature flag DM_TARGET_ATOMIC_WRITES.

Similar to md raid0, the chunk size set in stripe_io_hints() limits the
atomic write unit max.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 drivers/md/dm-stripe.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 4112071de0be..9add79c234ae 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -466,7 +466,8 @@ static void stripe_io_hints(struct dm_target *ti,
 static struct target_type stripe_target = {
 	.name   = "striped",
 	.version = {1, 6, 0},
-	.features = DM_TARGET_PASSES_INTEGRITY | DM_TARGET_NOWAIT,
+	.features = DM_TARGET_PASSES_INTEGRITY | DM_TARGET_NOWAIT |
+		    DM_TARGET_ATOMIC_WRITES,
 	.module = THIS_MODULE,
 	.ctr    = stripe_ctr,
 	.dtr    = stripe_dtr,
-- 
2.31.1