Introduce passive cache state

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

inc/ocf_cache.h

@@ -103,6 +103,15 @@ struct ocf_cache_info {
  */
 ocf_volume_t ocf_cache_get_volume(ocf_cache_t cache);
 
+/**
+ * @brief Obtain front volume from cache
+ *
+ * @param[in] cache Cache object
+ *
+ * @retval Volume, NULL if dettached.
+ */
+ocf_volume_t ocf_cache_get_front_volume(ocf_cache_t cache);
+
 /**
  * @brief Get name of given cache object
  *

inc/ocf_def.h

@@ -124,6 +124,9 @@ typedef enum {
 	ocf_cache_state_incomplete = 3, //!< ocf_cache_state_incomplete
 		/*!< OCF cache has at least one inactive core */
 
+	ocf_cache_state_passive = 4,     //!< ocf_cache_state_passive
+		/*!< OCF is currently in passive mode */
+
 	ocf_cache_state_max              //!< ocf_cache_state_max
 		/*!< Stopper of cache state enumerator */
 } ocf_cache_state_t;

inc/ocf_mngt.h

@@ -514,6 +514,28 @@ void ocf_mngt_cache_load(ocf_cache_t cache,
 		struct ocf_mngt_cache_device_config *cfg,
 		ocf_mngt_cache_load_end_t cmpl, void *priv);
 
+/**
+ * @brief Completion callback of cache bind operation
+ *
+ * @param[in] cache Cache handle
+ * @param[in] priv Callback context
+ * @param[in] error Error code (zero on success)
+ */
+typedef void (*ocf_mngt_cache_bind_end_t)(ocf_cache_t cache,
+		void *priv, int error);
+
+/**
+ * @brief Bind cache instance
+ *
+ * @param[in] cache Cache handle
+ * @param[in] cfg Caching device configuration
+ * @param[in] cmpl Completion callback
+ * @param[in] priv Completion callback context
+ */
+void ocf_mngt_cache_bind(ocf_cache_t cache,
+		struct ocf_mngt_cache_device_config *cfg,
+		ocf_mngt_cache_bind_end_t cmpl, void *priv);
+
 /* Adding and removing cores */
 
 /**