[PATCH RESEND] f2fs: don't allow volatile writes for non-regular file

[Chao Yu]

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

Signed-off-by: Chao Yu <yuch...@huawei.com>
---
 fs/f2fs/file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f64475a53ad8..f544a1648313 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1594,6 +1594,9 @@ 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;
-- 
2.8.2.295.g3f1c1d0