From 3d60b5db39906313247391c2173496fb0927e5e9 Mon Sep 17 00:00:00 2001
From: Chao Yu <yuchao0@huawei.com>
Date: Fri, 17 Mar 2017 15:43:57 +0800
Subject: [PATCH] f2fs: don't allow volatile writes for non-regular file

Now f2fs only supports volatile writes for journal db regular file.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 0e15770cc728..055495008c6c 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1603,6 +1603,9 @@ static int f2fs_ioc_start_volatile_write(struct file *filp)
 	if (!inode_owner_or_capable(inode))
 		return -EACCES;
 
+	if (!S_ISREG(inode->i_mode))
+		return -EINVAL;
+
 	ret = mnt_want_write_file(filp);
 	if (ret)
 		return ret;