linux-kernel - Re: configfs: Q: item leak in a failing configfs_attach

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Message-ID: <20080624171051.GD4184@ca-server1.us.oracle.com>
Date:	Tue, 24 Jun 2008 10:10:51 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Louis Rilling <Louis.Rilling@...labs.com>
Cc:	linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: configfs: Q: item leak in a failing configfs_attach_group()?

On Tue, Jun 24, 2008 at 04:16:49PM +0200, Louis Rilling wrote:
> Hi,
> 
> I'd like an opinion on the following scenario:
> 
> process 1: 					process 2:
> configfs_mkdir("A")
>   attach_group("A")
>     attach_item("A")
>       d_instantiate("A")
>     populate_groups("A")
>       mutex_lock("A")
>       attach_group("A/B")
>         attach_item("A")
>           d_instantiate("A/B")
> 						mkdir("A/B/C")
> 						  do_path_lookup("A/B/C", LOOKUP_PARENT)

					This has to sleep until
					configfs_mkdir("A") finishes.
					It's waiting on A->d_parent's
					i_mutex, which is held by
					sys_mkdirat().

Joel

-- 

"Sometimes one pays most for the things one gets for nothing."
        - Albert Einstein

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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