From: Christoph Hellwig <hch@infradead.org>
To: Dmitry Monakhov <dmonakhov@openvz.org>
Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 4/5] ext4: add isolated project support
Date: Thu, 11 Mar 2010 07:07:47 -0500 [thread overview]
Message-ID: <20100311120747.GD4706@infradead.org> (raw)
In-Reply-To: <1267727677-11956-5-git-send-email-dmonakhov@openvz.org>
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.
next prev parent reply other threads:[~2010-03-11 12:07 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-04 18:34 [PATCH 0/5] RFC: introduce extended inode owner identifier v5 Dmitry Monakhov
2010-03-04 18:34 ` [PATCH 1/5] vfs: Add additional owner identifier Dmitry Monakhov
2010-03-04 18:34 ` [PATCH 2/5] quota: Implement project id support for generic quota Dmitry Monakhov
2010-03-04 18:34 ` [PATCH 3/5] ext4: Implement project ID support for ext4 filesystem Dmitry Monakhov
2010-03-04 18:34 ` [PATCH 4/5] ext4: add isolated project support Dmitry Monakhov
2010-03-04 18:34 ` [PATCH 5/5] ext4: add project quota support Dmitry Monakhov
2010-03-04 20:07 ` [PATCH 4/5] ext4: add isolated project support Jan Kara
2010-03-04 20:34 ` Dmitry Monakhov
2010-03-11 12:07 ` Christoph Hellwig [this message]
2010-03-11 12:06 ` [PATCH 3/5] ext4: Implement project ID support for ext4 filesystem Christoph Hellwig
2010-03-11 13:30 ` Dmitry Monakhov
2010-03-11 19:54 ` Andreas Dilger
2010-03-11 22:01 ` tytso
2010-03-12 9:32 ` Dmitry Monakhov
2010-03-12 20:07 ` J. Bruce Fields
2010-03-11 12:03 ` [PATCH 2/5] quota: Implement project id support for generic quota Christoph Hellwig
2010-03-11 13:17 ` Dmitry Monakhov
2010-03-11 12:01 ` [PATCH 1/5] vfs: Add additional owner identifier Christoph Hellwig
2010-03-11 13:11 ` Dmitry Monakhov
2010-03-11 18:51 ` J. Bruce Fields
2010-03-11 19:40 ` Andreas Dilger
2010-03-12 8:47 ` Dmitry Monakhov
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