linux-kernel - Re: Copy on write hard links?

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Date:	Wed, 25 Sep 2013 03:40:42 +0200
From:	Adam Borowski <kilobyte@...band.pl>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Copy on write hard links?

On Tue, Sep 24, 2013 at 08:36:56PM +0200, Thomas Meyer wrote:
> Is there such a thing?

In mainline, AFAIK no.  The vserver patchset, on the other hand, adds a new
xattr, iunlink, that copies the whole file when needed.  That works on most
filesystems.

That's quite a hack, though, and I think you'd be better off using btrfs
which does cow transparently at a lower level than hardlinks.

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