blk-mq: improve support for shared tags maps

[mirror_ubuntu-bionic-kernel.git] / include / linux / blk-mq.h

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index f83d15f6e1c1846c88f76f60dd471b39c5c1bfa4..379f88d5c44d399511cb3fe990c97f1455f178f7 100644 (file)
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -48,6 +48,8 @@ struct blk_mq_hw_ctx {
        unsigned int            numa_node;
        unsigned int            cmd_size;       /* per-request extra data */
 
+       atomic_t                nr_active;
+
        struct blk_mq_cpu_notifier      cpu_notifier;
        struct kobject          kobj;
 };
@@ -64,6 +66,9 @@ struct blk_mq_tag_set {
        void                    *driver_data;
 
        struct blk_mq_tags      **tags;
+
+       struct mutex            tag_list_lock;
+       struct list_head        tag_list;
 };
 
 typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *);
@@ -126,8 +131,10 @@ enum {
 
        BLK_MQ_F_SHOULD_MERGE   = 1 << 0,
        BLK_MQ_F_SHOULD_SORT    = 1 << 1,
+       BLK_MQ_F_TAG_SHARED     = 1 << 2,
 
        BLK_MQ_S_STOPPED        = 0,
+       BLK_MQ_S_TAG_ACTIVE     = 1,
 
        BLK_MQ_MAX_DEPTH        = 2048,