Re: [PATCH 4/9] vfs: introduce clone_private_mount()

[Andrew Morton]

On Wed, 13 Mar 2013 15:16:28 +0100 Miklos Szeredi <miklos@xxxxxxxxxx> wrote:

> From: Miklos Szeredi <mszeredi@xxxxxxx>
> 
> Overlayfs needs a private clone of the mount, so create a function for
> this and export to modules.
> 
> ...
>
> +struct vfsmount *clone_private_mount(struct path *path)
> +{
> +	struct mount *old_mnt = real_mount(path->mnt);
> +	struct mount *new_mnt;
> +
> +	if (IS_MNT_UNBINDABLE(old_mnt))
> +		return ERR_PTR(-EINVAL);
> +
> +	down_read(&namespace_sem);
> +	new_mnt = clone_mnt(old_mnt, path->dentry, CL_PRIVATE);
> +	up_read(&namespace_sem);
> +	if (!new_mnt)
> +		return ERR_PTR(-ENOMEM);
> +
> +	return &new_mnt->mnt;
> +}
> +EXPORT_SYMBOL_GPL(clone_private_mount);

So this one gets the _GPL?

This is a new, exported-to-modules kernel interface function.  And it
is undocumented?


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