On Tue, May 29, 2018 at 04:43:23PM +0200, Miklos Szeredi wrote: > Signed-off-by: Miklos Szeredi <mszer...@redhat.com> > --- > fs/overlayfs/file.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c > index 3f610a5b38e4..e5e7ccaaf9ec 100644 > --- a/fs/overlayfs/file.c > +++ b/fs/overlayfs/file.c > @@ -110,6 +110,9 @@ static int ovl_open(struct inode *inode, struct file > *file) > if (IS_ERR(realfile)) > return PTR_ERR(realfile); > > + /* For O_DIRECT dentry_open() checks f_mapping->a_ops->direct_IO */ > + file->f_mapping = realfile->f_mapping;
Umm... What happens if upper layer doesn't allow O_DIRECT, while the lower one does?
