f2fs: fix flushing node pages when checkpoint is disabled

This patch fixes skipping node page writes when checkpoint is disabled.
In this period, we can't rely on checkpoint to flush node pages.

Fixes: fd8c8ca ("f2fs: let checkpoint flush dnode page of regular")
Fixes: 4354994 ("f2fs: checkpoint disabling")
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/node.c

@@ -1524,7 +1524,8 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
 	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 		goto redirty_out;
 
-	if (wbc->sync_mode == WB_SYNC_NONE &&
+	if (!is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
+			wbc->sync_mode == WB_SYNC_NONE &&
 			IS_DNODE(page) && is_cold_node(page))
 		goto redirty_out;
 
@@ -1909,7 +1910,8 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
 	}
 
 	if (step < 2) {
-		if (wbc->sync_mode == WB_SYNC_NONE && step == 1)
+		if (!is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
+				wbc->sync_mode == WB_SYNC_NONE && step == 1)
 			goto out;
 		step++;
 		goto next_step;