From: Yu Kuai <yukuai3@xxxxxxxxxx>
The bdi_dev_name() should not be used in blk-cgroup code, because bdi is
not related at all, add a new helper to print device name directly from
gendisk. The helper can also fix that "unknown" will be printed for
hidden disks.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
block/blk-cgroup.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index b9e3265c1eb3..d62bcc2bae14 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -239,6 +239,18 @@ static inline bool bio_issue_as_root_blkg(struct bio *bio)
return (bio->bi_opf & (REQ_META | REQ_SWAP)) != 0;
}
+static inline bool blkg_print_dev_name(struct seq_file *sf,
+ struct blkcg_gq *blkg)
+{
+ struct gendisk *disk = blkg->q->disk;
+
+ if (!disk)
+ return false;
+
+ seq_printf(sf, "%u:%u", disk->major, disk->first_minor);
+ return true;
+}
+
/**
* blkg_lookup - lookup blkg for the specified blkcg - q pair
* @blkcg: blkcg of interest
--
2.39.2
