blkio: Take care of cgroup deletion and cfq group reference counting
o One can choose to change elevator or delete a cgroup. Implement group
reference counting so that both elevator exit and cgroup deletion can
take place gracefully.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Nauman Rafique <nauman@google.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index ba5703f..cd50a2f 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -26,6 +26,7 @@
/* An rcu protected unique identifier for the group */
void *key;
struct hlist_node blkcg_node;
+ unsigned short blkcg_id;
};
#define BLKIO_WEIGHT_MIN 100
