linux-kernel - Re: [PATCH 4/9] vfs: introduce clone_private

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Message-Id: <20130313154811.191d970b8376f80ea98195a0@linux-foundation.org>
Date:	Wed, 13 Mar 2013 15:48:11 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	viro@...IV.linux.org.uk, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, apw@...onical.com, nbd@...nwrt.org,
	neilb@...e.de, jordipujolp@...il.com, ezk@....cs.sunysb.edu,
	dhowells@...hat.com, sedat.dilek@...glemail.com,
	hooanon05@...oo.co.jp, mszeredi@...e.cz
Subject: Re: [PATCH 4/9] vfs: introduce clone_private_mount()

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

> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> 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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