linux-kernel - Re: VFS support for fast copy on deduplicating FSes

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Message-ID: <20101125103258.GA16562@mother.pipebreaker.pl>
Date:	Thu, 25 Nov 2010 11:32:59 +0100
From:	Tomasz Torcz <tomek@...ebreaker.pl>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	BTRFS MAILING LIST <linux-btrfs@...r.kernel.org>
Subject: Re: VFS support for fast copy on deduplicating FSes

On Thu, Nov 25, 2010 at 04:19:17AM -0600, David Nicol wrote:
> unresearched question/suggestion:
> 
> Is there general support for a "fast copy" ioctl in the VFS layer,
> which would be hooked by file systems that support COW or other forms
> of deduplication and can provide copy semantics by manipulating
> metadata only?
> 

  Yes, see reflink(2) syscall (http://lwn.net/Articles/331576/).

-- 
Tomasz Torcz                "Funeral in the morning, IDE hacking
xmpp: zdzichubg@...ome.pl    in the afternoon and evening." - Alan Cox

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