There is no need to initialize the group code before the disk is marked
live. Moving the cgroup initialization earlier will help to have a
fully initialized struct device in the gendisk for the cgroup code to
use in the future. Similarly tear the cgroup information down in
del_gendisk to be symmetric and because none of the cgroup tracking is
needed once non-passthrough I/O stops.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/genhd.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/block/genhd.c b/block/genhd.c
index 23cf83b3331cde..705dec0800d62e 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -466,10 +466,14 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
*/
pm_runtime_set_memalloc_noio(ddev, true);
- ret = blk_integrity_add(disk);
+ ret = blkcg_init_disk(disk);
if (ret)
goto out_del_block_link;
+ ret = blk_integrity_add(disk);
+ if (ret)
+ goto out_blkcg_exit;
+
disk->part0->bd_holder_dir =
kobject_create_and_add("holders", &ddev->kobj);
if (!disk->part0->bd_holder_dir) {
@@ -534,6 +538,8 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
kobject_put(disk->part0->bd_holder_dir);
out_del_integrity:
blk_integrity_del(disk);
+out_blkcg_exit:
+ blkcg_exit_disk(disk);
out_del_block_link:
if (!sysfs_deprecated)
sysfs_remove_link(block_depr, dev_name(ddev));
@@ -662,6 +668,8 @@ void del_gendisk(struct gendisk *disk)
rq_qos_exit(q);
blk_mq_unquiesce_queue(q);
+ blkcg_exit_disk(disk);
+
/*
* If the disk does not own the queue, allow using passthrough requests
* again. Else leave the queue frozen to fail all I/O.
@@ -1171,8 +1179,6 @@ static void disk_release(struct device *dev)
!test_bit(GD_ADDED, &disk->state))
blk_mq_exit_queue(disk->queue);
- blkcg_exit_disk(disk);
-
bioset_exit(&disk->bio_split);
disk_release_events(disk);
@@ -1385,9 +1391,6 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL))
goto out_destroy_part_tbl;
- if (blkcg_init_disk(disk))
- goto out_erase_part0;
-
rand_initialize_disk(disk);
disk_to_dev(disk)->class = &block_class;
disk_to_dev(disk)->type = &disk_type;
@@ -1400,8 +1403,6 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
#endif
return disk;
-out_erase_part0:
- xa_erase(&disk->part_tbl, 0);
out_destroy_part_tbl:
xa_destroy(&disk->part_tbl);
disk->part0->bd_disk = NULL;
--
2.39.0
