block: Enhance new plugging support to support general callbacks

[firefly-linux-kernel-4.4.55.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ec0357d8c4a58679c96bc3e937b5de97e9a4063c..f3f7879391a7c380ac7daa40757245dafea021c5 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -860,8 +860,13 @@ extern void blk_put_queue(struct request_queue *);
 struct blk_plug {
        unsigned long magic;
        struct list_head list;
+       struct list_head cb_list;
        unsigned int should_sort;
 };
+struct blk_plug_cb {
+       struct list_head list;
+       void (*callback)(struct blk_plug_cb *);
+};
 
 extern void blk_start_plug(struct blk_plug *);
 extern void blk_finish_plug(struct blk_plug *);
@@ -887,7 +892,7 @@ static inline bool blk_needs_flush_plug(struct task_struct *tsk)
 {
        struct blk_plug *plug = tsk->plug;
 
-       return plug && !list_empty(&plug->list);
+       return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list));
 }
 
 /*