linux-kernel - Re: [PATCH 25/20] sysfs: Only support removing emtpy sysfs directories.

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Date:	Wed, 27 May 2009 11:24:38 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	SCSI development list <linux-scsi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	<linux-fsdevel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: Re: [PATCH 25/20] sysfs: Only support removing emtpy sysfs  directories.

Alan Stern <stern@...land.harvard.edu> writes:

>
> As fas as I know, they can't.  Instead, they can cause the SCSI layer 
> to unregister a sysfs directory containing a child directory.  :-)
>
> Basically, a user program can delay removal of the child (i.e., the
> target) directory indefinitely, because currently the target isn't
> unregistered when all its children are removed -- it's unregistered
> when all its children are _released_.

Ok.  Is this opens of /dev/sda1 and the like that are being held open by
userspace that are potentially causing problems?

I think I have the fix to that...

Eric
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