f2fs: add sbi and page pointer in f2fs_io_info

This patch adds f2fs_sb_info and page pointers in f2fs_io_info structure.
With this change, we can reduce a lot of parameters for IO functions.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/super.c

@@ -520,7 +520,7 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
 	} else {
 		f2fs_balance_fs(sbi);
 	}
-	f2fs_trace_ios(NULL, NULL, 1);
+	f2fs_trace_ios(NULL, 1);
 
 	return 0;
 }