diff mbox series

[-next,3/5] blk-iocost: don't allow to configure bio based device

Message ID 20221028101056.1971715-4-yukuai1@huaweicloud.com
State New
Headers
Series blk-iocost: random patches to improve configuration |

Commit Message

Yu Kuai Oct. 28, 2022, 10:10 a.m. UTC 
  From: Yu Kuai <yukuai3@huawei.com>

iocost is based on rq_qos, which can only work for request based device,
thus it doesn't make sense to configure iocost for bio based device.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 block/blk-iocost.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

Comments

Christoph Hellwig Oct. 30, 2022, 9:41 a.m. UTC | #1 
Looks good (I actually stubled over this a few days ago as well):

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index c532129a1456..2bfecc511dd9 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3181,6 +3181,11 @@  static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
 		return PTR_ERR(bdev);
 
 	disk = bdev->bd_disk;
+	if (!queue_is_mq(disk->queue)) {
+		ret = -EPERM;
+		goto out;
+	}
+
 	ioc = q_to_ioc(disk->queue);
 	if (!ioc) {
 		ret = blk_iocost_init(disk);
@@ -3364,6 +3369,11 @@  static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
 		return PTR_ERR(bdev);
 
 	q = bdev_get_queue(bdev);
+	if (!queue_is_mq(q)) {
+		ret = -EPERM;
+		goto out;
+	}
+
 	ioc = q_to_ioc(q);
 	if (!ioc) {
 		ret = blk_iocost_init(bdev->bd_disk);