1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 325349559fb0..02c5d950f444 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -4,6 +4,7 @@
 #include <linux/blkdev.h>
 
 struct blk_mq_tags;
+struct blk_flush_queue;
 
 struct blk_mq_cpu_notifier {
         struct list_head list;
@@ -34,6 +35,7 @@ struct blk_mq_hw_ctx {
 
         struct request_queue    *queue;
         unsigned int            queue_num;
+        struct blk_flush_queue  *fq;
 
         void                    *driver_data;
 
@@ -119,6 +121,10 @@ struct blk_mq_ops {
         /*
          * Called for every command allocated by the block layer to allow
          * the driver to set up driver specific data.
+         *
+         * Tag greater than or equal to queue_depth is for setting up
+         * flush request.
+         *
          * Ditto for exit/teardown.
          */
         init_request_fn         *init_request;