linux-kernel - Re: [RFC PATCH] file as directory

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Message-Id: <E1Hqsij-000338-00@dorka.pomaz.szeredi.hu>
Date:	Wed, 23 May 2007 17:25:49 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	viro@....linux.org.uk
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org
Subject: Re: [RFC PATCH] file as directory

> > How will this work with copy_tree() and namespace duplication, which
> > currently walk the tree with only namespace_sem held?
> 
> Easy - grab namespace_sem, grab vfsmount_lock, walk the subtree and bump
> mnt_busy on everything (by 1 + number of non-busy children).  Then drop
> vfsmount_lock and do as usual, dropping references in tree being copied
> as you go.  Nothing will get attached or detached due to namespace_sem,
> nothing will get evicted by anybody other than you since you've got all
> that stuff pinned down.  End of story...

Right.

Do you have some code?

Should I try to code something up?

Miklos
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