linux-kernel - Re: [patch 06/14] hfsplus: remove hfsplus

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Message-ID: <Pine.LNX.4.64.0805232347500.18302@localhost.localdomain>
Date:	Fri, 23 May 2008 23:52:20 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	hch@...radead.org, linux-fsdevel@...r.kernel.org,
	viro@...IV.linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [patch 06/14] hfsplus: remove hfsplus_permission()

Hi,

On Fri, 23 May 2008, Miklos Szeredi wrote:

> Semi-concrete: link(2) locks the target's parent and the source.
> Cross-directory rename(2) locks both parents.  If link's target is a
> file which has children, this can result in an ABBA deadlock.  That's
> _before_ the filesystem's ->link() or ->rename() function is called.

I'm afraid you have to be more concrete than this. 
hfsplus_file_inode_operations doesn't have a link or rename operation, so 
if one your source parents above involves a file, it shouldn't get this 
far or you have to describe your scenario in more detail.

bye, Roman
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