linux-kernel - Re: Thinking outside the box on file systems

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Message-ID: <17471.1187278162@turing-police.cc.vt.edu>
Date:	Thu, 16 Aug 2007 11:29:22 -0400
From:	Valdis.Kletnieks@...edu
To:	Phillip Susi <psusi@....rr.com>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	Michael Tharp <gxti@...tiallystapled.com>,
	alan <alan@...eserver.org>, Marc Perkel <mperkel@...oo.com>,
	LKML Kernel <linux-kernel@...r.kernel.org>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: Thinking outside the box on file systems

On Thu, 16 Aug 2007 11:09:16 EDT, Phillip Susi said:

> No recursion is needed because only one acl exists, so that is the only 
> one you need to update.  At least on disk.  Any cached acls in memory of 
> descendant objects would need updated, but the number of those should be 
> relatively small. 

On my laptop (this is a *laptop*, mind you):

% df -i /home
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/mapper/VolGroup00-home
                      655360  532361  122999   82% /home

What happens if I do a 'mv /home /home1'?  Looks like more than a "relatively
small" number.  A cold-cache 'find' takes a few minutes to wade through it all,
so any solutions you come up with should beware of locking issues...



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