From: Chao Yu <yuchao0@huawei.com>
Date: Fri, 17 Mar 2017 07:43:57 +0000 (+0800)
Subject: f2fs: don't allow volatile writes for non-regular file
X-Git-Tag: v4.12-rc1~71^2~99
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=8ff0971f1500953935339c23c91f660793fd4c64;p=linux.git

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>
---

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 2cf16ed5b74c..427ab1b41de3 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1598,6 +1598,9 @@ 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;