Move ocf_request from utils

ocf_request has always been first class citizen in OCF,
so lets place it along with another essential objects.

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

src/ocf_request.h

@@ -8,6 +8,8 @@
 
 #include "ocf_env.h"
 
+struct ocf_req_allocator;
+
 struct ocf_req_info {
 	/* Number of hits, invalid, misses. */
 	unsigned int hit_no;
@@ -201,4 +203,131 @@ struct ocf_request {
 
 typedef void (*ocf_req_end_t)(struct ocf_request *req, int error);
 
-#endif
+/**
+ * @brief Initialize OCF request allocation utility
+ *
+ * @param cache - OCF cache instance
+ * @return Operation status 0 - successful, non-zero failure
+ */
+int ocf_req_allocator_init(struct ocf_ctx *ocf_ctx);
+
+/**
+ * @brief De-initialize OCF request allocation utility
+ *
+ * @param cache - OCF cache instance
+ */
+void ocf_req_allocator_deinit(struct ocf_ctx *ocf_ctx);
+
+/**
+ * @brief Allocate new OCF request
+ *
+ * @param queue - I/O queue handle
+ * @param core - OCF core instance
+ * @param addr - LBA of request
+ * @param bytes - number of bytes of request
+ * @param rw - Read or Write
+ *
+ * @return new OCF request
+ */
+struct ocf_request *ocf_req_new(ocf_queue_t queue, ocf_core_t core,
+		uint64_t addr, uint32_t bytes, int rw);
+
+/**
+ * @brief Allocate OCF request map
+ *
+ * @param req OCF request
+ *
+ * @retval 0 Allocation succeed
+ * @retval non-zero Allocation failed
+ */
+int ocf_req_alloc_map(struct ocf_request *req);
+
+/**
+ * @brief Allocate new OCF request with NOIO map allocation for huge request
+ *
+ * @param queue - I/O queue handle
+ * @param core - OCF core instance
+ * @param addr - LBA of request
+ * @param bytes - number of bytes of request
+ * @param rw - Read or Write
+ *
+ * @return new OCF request
+ */
+
+struct ocf_request *ocf_req_new_extended(ocf_queue_t queue, ocf_core_t core,
+		uint64_t addr, uint32_t bytes, int rw);
+
+/**
+ * @brief Allocate new OCF request for DISCARD operation
+ *
+ * @param queue - I/O queue handle
+ * @param core - OCF core instance
+ * @param addr - LBA of request
+ * @param bytes - number of bytes of request
+ * @param rw - Read or Write
+ *
+ * @return new OCF request
+ */
+struct ocf_request *ocf_req_new_discard(ocf_queue_t queue, ocf_core_t core,
+		uint64_t addr, uint32_t bytes, int rw);
+
+/**
+ * @brief Increment OCF request reference count
+ *
+ * @param req - OCF request
+ */
+void ocf_req_get(struct ocf_request *req);
+
+/**
+ * @brief Decrement OCF request reference. If reference is 0 then request will
+ * be deallocated
+ *
+ * @param req - OCF request
+ */
+void ocf_req_put(struct ocf_request *req);
+
+/**
+ * @brief Clear OCF request info
+ *
+ * @param req - OCF request
+ */
+void ocf_req_clear_info(struct ocf_request *req);
+
+/**
+ * @brief Clear OCF request map
+ *
+ * @param req - OCF request
+ */
+void ocf_req_clear_map(struct ocf_request *req);
+
+/**
+ * @brief Clear OCF request
+ *
+ * @param req - OCF request
+ */
+static inline void ocf_req_clear(struct ocf_request *req)
+{
+	ocf_req_clear_info(req);
+	ocf_req_clear_map(req);
+
+	env_atomic_set(&req->lock_remaining, 0);
+	env_atomic_set(&req->req_remaining, 0);
+}
+
+/**
+ * @brief Return OCF request reference count
+ *
+ * @param req - OCF request
+ * @return OCF request reference count
+ */
+static inline int ocf_req_ref_count(struct ocf_request *req)
+{
+	return env_atomic_read(&req->ref_count);
+}
+
+static inline bool ocf_req_is_4k(uint64_t addr, uint32_t bytes)
+{
+	return !((addr % PAGE_SIZE) || (bytes % PAGE_SIZE));
+}
+
+#endif /* __OCF_REQUEST_H__ */