ftl: separate code to start a transaction

source/ftl/ftl.c

@@ -44,24 +44,18 @@ size_t ftl_read(struct ftl_map *map, void *data, size_t len, uint32_t va)
 		len);
 }
 
-static int ftl_seek(struct ftl_map *map, uint32_t va)
+static int ftl_start_transaction(struct ftl_map *map, uint32_t va)
 {
-	size_t len;
+	uint32_t page;
 	int ret;
-	uint32_t offset, page, dst, src;
-
-	if (va >= ftl_get_capacity(map))
-		return -1;
 
-	offset = va & ((1 << map->log2_page_size) - 1);
+	if ((map->outstanding.flags & FTL_PRESENT) && map->outstanding.va == va)
-	va >>= map->log2_page_size;
+		return 0;
 
-	if (!(map->outstanding.flags & FTL_PRESENT) || map->outstanding.va != va) {
 	if (ftl_sync(map) < 0)
 		return -1;
 
-		if ((ret = trace_path(map, NULL, &page, va)) < 0 &&
+	if ((ret = trace_path(map, NULL, &page, va)) < 0 && ret != -ERR_NOT_FOUND)
-			ret != -ERR_NOT_FOUND)
 		return -1;
 
 	if (prepare_head(map) < 0)
@@ -77,8 +71,25 @@ static int ftl_seek(struct ftl_map *map, uint32_t va)
 	}
 
 	map->offset = 0;
+
+	return 0;
 }
 
+static int ftl_seek(struct ftl_map *map, uint32_t va)
+{
+	size_t len;
+	uint32_t offset, dst, src;
+	int ret;
+
+	if (va >= ftl_get_capacity(map))
+		return -1;
+
+	offset = va & ((1 << map->log2_page_size) - 1);
+	va >>= map->log2_page_size;
+
+	if (ftl_start_transaction(map, va) < 0)
+		return -1;
+
 	if (offset < map->offset)
 		return -1;