Synchronization of collision table

Adding synchronization around metadata collision segment pages.
This part of metadata is modified when cacheline is mapped/unmapped
and when dirty status changes.

Synchronization on page level is required on top of cacheline
and hash bucket locks to assure metadata flush always reads
consistent state when copying entire collision table memory
page.

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

src/eviction/lru.c

@@ -432,9 +432,13 @@ uint32_t evp_lru_req_clines(ocf_cache_t cache, ocf_queue_t io_queue,
 			evp_lru_zero_line(cache, io_queue, curr_cline);
 
 		} else {
+			ocf_metadata_start_collision_shared_access(cache,
+					curr_cline);
 			set_cache_line_invalid_no_flush(cache, 0,
 					ocf_line_end_sector(cache),
 					curr_cline);
+			ocf_metadata_end_collision_shared_access(cache,
+					curr_cline);
 
 			/* Goto next item. */
 			i++;