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-rw-r--r--block/blk-core.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 17eed16a6e04..edc276899116 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -349,6 +349,36 @@ void blk_sync_queue(struct request_queue *q)
EXPORT_SYMBOL(blk_sync_queue);
/**
+ * blk_set_preempt_only - set QUEUE_FLAG_PREEMPT_ONLY
+ * @q: request queue pointer
+ *
+ * Returns the previous value of the PREEMPT_ONLY flag - 0 if the flag was not
+ * set and 1 if the flag was already set.
+ */
+int blk_set_preempt_only(struct request_queue *q)
+{
+ unsigned long flags;
+ int res;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ res = queue_flag_test_and_set(QUEUE_FLAG_PREEMPT_ONLY, q);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(blk_set_preempt_only);
+
+void blk_clear_preempt_only(struct request_queue *q)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ queue_flag_clear(QUEUE_FLAG_PREEMPT_ONLY, q);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+}
+EXPORT_SYMBOL_GPL(blk_clear_preempt_only);
+
+/**
* __blk_run_queue_uncond - run a queue whether or not it has been stopped
* @q: The queue to run
*