block: move the bdi from the request_queue to the gendisk
The backing device information only makes sense for file system I/O,
and thus belongs into the gendisk and not the lower level request_queue
structure. Move it there.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20210809141744.1203023-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 575d7a2..db034e3 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -489,10 +489,9 @@ static int blkcg_reset_stats(struct cgroup_subsys_state *css,
const char *blkg_dev_name(struct blkcg_gq *blkg)
{
- /* some drivers (floppy) instantiate a queue w/o disk registered */
- if (blkg->q->backing_dev_info->dev)
- return bdi_dev_name(blkg->q->backing_dev_info);
- return NULL;
+ if (!queue_has_disk(blkg->q) || !queue_to_disk(blkg->q)->bdi->dev)
+ return NULL;
+ return bdi_dev_name(queue_to_disk(blkg->q)->bdi);
}
/**