dm mpath: add optional "queue_mode" feature

[mirror_ubuntu-jammy-kernel.git] / include / linux / device-mapper.h

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 0830c9e86f0ddb94e897758724439df922721d97..2ce339212b6e6c87474c395856d430aa2cdf6200 100644 (file)
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -19,6 +19,14 @@ struct dm_table;
 struct mapped_device;
 struct bio_vec;
 
+/*
+ * Type of table, mapped_device's mempool and request_queue
+ */
+#define DM_TYPE_NONE                   0
+#define DM_TYPE_BIO_BASED              1
+#define DM_TYPE_REQUEST_BASED          2
+#define DM_TYPE_MQ_REQUEST_BASED       3
+
 typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
 
 union map_info {
@@ -443,6 +451,14 @@ int dm_table_add_target(struct dm_table *t, const char *type,
  */
 void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb);
 
+/*
+ * Target can use this to set the table's type.
+ * Can only ever be called from a target's ctr.
+ * Useful for "hybrid" target (supports both bio-based
+ * and request-based).
+ */
+void dm_table_set_type(struct dm_table *t, unsigned type);
+
 /*
  * Finally call this to make the table ready for use.
  */