ftl: copy the page of the cousin instead of the page to trim in ftl_trim()

source/ftl/ftl.c

@@ -82,7 +82,7 @@ int ftl_trim(struct ftl_map *map, uint32_t va)
 {
 	struct ftl_page_desc page_desc, alt_page_desc;
 	size_t level, i;
-	uint32_t alt_va, page;
+	uint32_t alt_page, page;
 	int ret;
 
 	if ((ret = trace_path(map, &page_desc, &page, va)) < 0) {
@@ -97,7 +97,7 @@ int ftl_trim(struct ftl_map *map, uint32_t va)
 	for (i = 0; i < 32; ++i) {
 		level = 32 - i - 1;
 
-		if ((alt_va = page_desc.subtrees[level]) != UINT32_MAX)
+		if ((alt_page = page_desc.subtrees[level]) != UINT32_MAX)
 			break;
 	}
 
@@ -110,7 +110,7 @@ int ftl_trim(struct ftl_map *map, uint32_t va)
 		return write_upage(map, NULL, &page_desc);
 	}
 
-	if (read_page_desc(map, &alt_page_desc, alt_va) < 0)
+	if (read_page_desc(map, &alt_page_desc, alt_page) < 0)
 		return -1;
 
 	page_desc.va = alt_page_desc.va;
@@ -122,7 +122,7 @@ int ftl_trim(struct ftl_map *map, uint32_t va)
 	}
 
 	if (flash_copy(map->dev, map->head << map->log2_page_size,
-		page << map->log2_page_size, 1 << map->log2_page_size) < 0)
+		alt_page << map->log2_page_size, 1 << map->log2_page_size) < 0)
 		return -1;
 
 	return write_upage(map, NULL, &page_desc);