bool __mnt_is_readonly(struct vfsmount *mnt)
{
	return (mnt->mnt_flags & MNT_READONLY) || sb_rdonly(mnt->mnt_sb);
}
bool __mnt_is_readonly(struct vfsmount *mnt)
{
	return (mnt->mnt_flags & MNT_READONLY) || sb_rdonly(mnt->mnt_sb);
}