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Subject[PATCH -next 3/6] blk-wbt: don't enable wbt for bio based device
Date
From: Yu Kuai <yukuai3@huawei.com>

Because rq_qos only make sense for rq based device. Instead of fail
from sysfs configuration, make wbt sysfs dentry invisible directly.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
block/blk-sysfs.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 6c1c4ba66bc0..c8e1f1462422 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -686,6 +686,10 @@ static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
!blk_queue_is_zoned(q))
return 0;

+#ifdef CONFIG_BLK_WBT
+ if (attr == &queue_wb_lat_entry.attr && !queue_is_mq(q))
+ return 0;
+#endif
return attr->mode;
}

--
2.39.2
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