f2fs: do SSR for node segments more aggresively

This patch gives more SSR chances for node blocks.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/segment.c

@@ -1528,17 +1528,22 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
 	const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
-	int i;
+	int i, n;
 
 	/* need_SSR() already forces to do this */
 	if (v_ops->get_victim(sbi, &(curseg)->next_segno, BG_GC, type, SSR))
 		return 1;
 
-	if (IS_NODESEG(type))
-		return 0;
+	/* For node segments, let's do SSR more intensively */
+	if (IS_NODESEG(type)) {
+		i = CURSEG_HOT_NODE;
+		n = CURSEG_COLD_NODE;
+	} else {
+		i = CURSEG_HOT_DATA;
+		n = CURSEG_COLD_DATA;
+	}
 
-	/* For data segments, let's do SSR more intensively */
-	for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
+	for (; i <= n; i++) {
 		if (i == type)
 			continue;
 		if (v_ops->get_victim(sbi, &(curseg)->next_segno,