Write-only cache mode

Write-only cache mode is similar to writeback, however read
operations do not promote data to cache. Reads are mostly serviced
by the core device, only dirty sectors are fetched from the cache.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>

src/ocf_request.h

@@ -144,7 +144,7 @@ struct ocf_request {
 	/*!< Copy of request data */
 
 	uint64_t byte_position;
-	/*!< LBA byte position of request in code domain */
+	/*!< LBA byte position of request in core domain */
 
 	uint64_t core_line_first;
 	/*! First core line */