linux-kernel - [RFC PATCH 03/21] nbd: use lib tagset init helper

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Date:   Tue, 4 Oct 2022 20:22:39 -0700
From:   Chaitanya Kulkarni <kch@...dia.com>
To:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
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Subject: [RFC PATCH 03/21] nbd: use lib tagset init helper

Use the block layer helper to initialize the common fields of tag_set
such as blk_mq_ops, number of h/w queues, queue depth, command size,
numa_node, timeout, BLK_MQ_F_XXX flags, driver data. This initialization
is spread all over the block drivers. This avoids the code repetation of
the inialization code of the tag set in current block drivers and any
future ones.

Signed-off-by: Chaitanya Kulkarni <kch@...dia.com>
---
 drivers/block/nbd.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 2a2a1d996a57..01be68d1f722 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1749,14 +1749,9 @@ static struct nbd_device *nbd_dev_add(int index, unsigned int refs)
 	if (!nbd)
 		goto out;
 
-	nbd->tag_set.ops = &nbd_mq_ops;
-	nbd->tag_set.nr_hw_queues = 1;
-	nbd->tag_set.queue_depth = 128;
-	nbd->tag_set.numa_node = NUMA_NO_NODE;
-	nbd->tag_set.cmd_size = sizeof(struct nbd_cmd);
-	nbd->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
-		BLK_MQ_F_BLOCKING;
-	nbd->tag_set.driver_data = nbd;
+	blk_mq_init_tag_set(&nbd->tag_set, &nbd_mq_ops, 1, 128,
+			sizeof(struct nbd_cmd), NUMA_NO_NODE, 0,
+			BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING, nbd);
 	INIT_WORK(&nbd->remove_work, nbd_dev_remove_work);
 	nbd->backend = NULL;
 
-- 
2.29.0