linux-ext4 - Re: [PATCH 4/5] ext4: add isolated project support

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Message-ID: <20100311120747.GD4706@infradead.org>
Date:	Thu, 11 Mar 2010 07:07:47 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/5] ext4: add isolated project support

On Thu, Mar 04, 2010 at 09:34:36PM +0300, Dmitry Monakhov wrote:
> PROJECT_ISOLATION
> This feature allows to create an isolated project subtrees.
> Isolation means what:
>   1) directory subtree has no common inodes (no hadlinks across subtrees)
>   2) All descendants belongs to the same subtree.
> 
> Project subtree's isolation assumptions:
>   1)Inode can not belongs to different subtree trees
>     Otherwise changes in one subtree result in changes in other subtree
>     which contradict to isolation criteria.
> 
> *Usage*
>  We already has bind mounts which prevent link/remount across mounts.
>  But if user has isolated project which consists of several subtrees
>  and he want link/renames to work between subtrees(but in one project)
> 
> Since this feature is non obvious it controlled by mount option.

Making this a mount option is even more non-obvious.  Unless you have
very good reason to support both and not just stick to the existing
"isolated" semantics make it a chattr option so we can easily check
out what kind of subtree we deal with.

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