blk-mq: support per-distpatch_queue flush machinery

[linux-2.6-block.git] / include / linux / blk-mq.h

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 325349559fb07887d8dad987e4a28b4759bc58ac..02c5d950f444dac4dbe84827ec998fc4d0f852aa 100644 (file)
--- 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;