[PATCH 4.4 36/69] ovl: fsync after copy-up

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <mszer...@redhat.com>

commit 641089c1549d8d3df0b047b5de7e9a111362cdce upstream.

Make sure the copied up file hits the disk before renaming to the final
destination.  If this is not done then the copy-up may corrupt the data in
the file in case of a crash.

Signed-off-by: Miklos Szeredi <mszer...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/overlayfs/copy_up.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -139,6 +139,8 @@ static int ovl_copy_up_data(struct path
                len -= bytes;
        }
 
+       if (!error)
+               error = vfs_fsync(new_file, 0);
        fput(new_file);
 out_fput:
        fput(old_file);