f2fs: increase pages_skipped when skipping writepages

This patch increases pages_skipped when skipping writepages.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 1f52b70..aef32f3 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -190,12 +190,9 @@
 	int nrpages = nr_pages_to_skip(sbi, META);
 	long written;
 
-	if (wbc->for_kupdate)
-		return 0;
-
 	/* collect a number of dirty meta pages and write together */
-	if (get_pages(sbi, F2FS_DIRTY_META) < nrpages)
-		return 0;
+	if (wbc->for_kupdate || get_pages(sbi, F2FS_DIRTY_META) < nrpages)
+		goto skip_write;
 
 	/* if mounting is failed, skip writing node pages */
 	mutex_lock(&sbi->cp_mutex);
@@ -203,6 +200,10 @@
 	mutex_unlock(&sbi->cp_mutex);
 	wbc->nr_to_write -= written;
 	return 0;
+
+skip_write:
+	wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
+	return 0;
 }
 
 long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,