linux-kernel - Re: Finding hardlinks

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Message-Id: <1168359985.7817.4.camel@localhost.localdomain>
Date:	Tue, 09 Jan 2007 11:26:25 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	pavel@....cz, mikulas@...ax.karlin.mff.cuni.cz, matthew@....cx,
	bhalevy@...asas.com, arjan@...radead.org, jaharkes@...cmu.edu,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	nfsv4@...f.org
Subject: Re: Finding hardlinks

On Mon, 2007-01-08 at 13:00 +0100, Miklos Szeredi wrote:

> > 50% probability of false positive on 4G files seems like very ugly
> > design problem to me.
> 
> 4 billion files, each with more than one link is pretty far fetched.
> And anyway, filesystems can take steps to prevent collisions, as they
> do currently for 32bit st_ino, without serious difficulties
> apparently.

Maybe not 4 billion files, but you can get a large number of >1 linked
files, when you copy full directories with "cp -rl".  Which I do a lot
when developing. I've done that a few times with the Linux tree.  Given
other utils that copy as hard links, can perhaps make a 4 billion number
of files with >1 link possible, and perhaps likely in the near future.

-- Steve


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