ftl: add ftl_is_mapped() to check if a page is mapped

include/ftl.h

@@ -30,6 +30,7 @@ struct ftl_map {
 
 int ftl_init_map(struct ftl_map *map, struct flash_dev *dev);
 int ftl_resume_map(struct ftl_map *map);
+int ftl_is_mapped(struct ftl_map *map, uint32_t va);
 size_t ftl_write(struct ftl_map *map, uint32_t addr, const void *data,
 	size_t len);
 size_t ftl_read(struct ftl_map *map, void *data, size_t len, uint32_t va);

source/ftl/ftl.c

@@ -12,6 +12,16 @@
 #include "gc.h"
 #include "map.h"
 
+int ftl_is_mapped(struct ftl_map *map, uint32_t va)
+{
+	va = align(va, map->log2_page_size);
+
+	if (trace_path(map, NULL, NULL, va) < 0)
+		return 0;
+
+	return 1;
+}
+
 size_t ftl_read(struct ftl_map *map, void *data, size_t len, uint32_t va)
 {
 	int ret;