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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. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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