linux-kernel - [PATCH 2/4] dm: Process .io_hints for drivers not having underlying devices

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Date:   Mon, 28 Mar 2022 14:18:29 +0300
From:   Kirill Tkhai <kirill.tkhai@...nvz.org>
To:     agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
        song@...nel.org, linux-kernel@...r.kernel.org,
        khorenko@...tuozzo.com, kirill.tkhai@...nvz.org
Subject: [PATCH 2/4] dm: Process .io_hints for drivers not having underlying
 devices

This makes dm_calculate_queue_limits() sets the hints also for drivers,
which do not have underlying devices.
This is useful for dm-qcow2 driver, that wants to have incomming requests
are likely splitted by QCOW2 cluster size alignment.

Signed-off-by: Kirill Tkhai <kirill.tkhai@...nvz.org>
---
 drivers/md/dm-table.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index e43096cfe9e2..aa2e85bef6e7 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1660,8 +1660,11 @@ int dm_calculate_queue_limits(struct dm_table *table,
 
 		ti = dm_table_get_target(table, i);
 
-		if (!ti->type->iterate_devices)
+		if (!ti->type->iterate_devices) {
+			if (ti->type->io_hints)
+				ti->type->io_hints(ti, &ti_limits);
 			goto combine_limits;
+		}
 
 		/*
 		 * Combine queue limits of all the devices this target uses.