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-rw-r--r--block/blk-core.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index a3d2fdc8ed1c..149149dd7f7b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -28,6 +28,7 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/fault-inject.h>
#include <linux/list_sort.h>
+#include <linux/delay.h>
#define CREATE_TRACE_POINTS
#include <trace/events/block.h>
@@ -345,6 +346,33 @@ void blk_put_queue(struct request_queue *q)
}
EXPORT_SYMBOL(blk_put_queue);
+/**
+ * blk_drain_queue - drain requests from request_queue
+ * @q: queue to drain
+ *
+ * Drain ELV_PRIV requests from @q. The caller is responsible for ensuring
+ * that no new requests which need to be drained are queued.
+ */
+void blk_drain_queue(struct request_queue *q)
+{
+ while (true) {
+ int nr_rqs;
+
+ spin_lock_irq(q->queue_lock);
+
+ elv_drain_elevator(q);
+
+ __blk_run_queue(q);
+ nr_rqs = q->rq.elvpriv;
+
+ spin_unlock_irq(q->queue_lock);
+
+ if (!nr_rqs)
+ break;
+ msleep(10);
+ }
+}
+
/*
* Note: If a driver supplied the queue lock, it is disconnected
* by this function. The actual state of the lock doesn't matter