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-rw-r--r--block/blk-cgroup.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 8dfe62786cd5..97266ebde975 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1950,6 +1950,26 @@ void blk_cgroup_bio_start(struct bio *bio)
put_cpu();
}
+bool blk_cgroup_congested(void)
+{
+ struct cgroup_subsys_state *css;
+ bool ret = false;
+
+ rcu_read_lock();
+ css = kthread_blkcg();
+ if (!css)
+ css = task_css(current, io_cgrp_id);
+ while (css) {
+ if (atomic_read(&css->cgroup->congestion_count)) {
+ ret = true;
+ break;
+ }
+ css = css->parent;
+ }
+ rcu_read_unlock();
+ return ret;
+}
+
static int __init blkcg_init(void)
{
blkcg_punt_bio_wq = alloc_workqueue("blkcg_punt_bio",