f2fs: flush bios to handle cp_error in put_super

Sometimes, if cp_error is set, there remains under-writeback pages, resulting in
kernel hang in put_super.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 58d9a55..9445a34 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -582,6 +582,13 @@
 	f2fs_leave_shrinker(sbi);
 	mutex_unlock(&sbi->umount_mutex);
 
+	/* our cp_error case, we can wait for any writeback page */
+	if (get_pages(sbi, F2FS_WRITEBACK)) {
+		f2fs_submit_merged_bio(sbi, DATA, WRITE);
+		f2fs_submit_merged_bio(sbi, NODE, WRITE);
+		f2fs_submit_merged_bio(sbi, META, WRITE);
+	}
+
 	iput(sbi->node_inode);
 	iput(sbi->meta_inode);