linux-kernel - Re: fanotify - overall design before I start sending patches

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Message-Id: <1248898455.2597.59.camel@localhost>
Date:	Wed, 29 Jul 2009 16:14:15 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Andreas Dilger <adilger@....com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, malware-list@...sg.printk.net,
	Valdis.Kletnieks@...edu, greg@...ah.com, jcm@...hat.com,
	douglas.leeder@...hos.com, tytso@....edu, arjan@...radead.org,
	david@...g.hm, jengelh@...ozas.de, aviro@...hat.com,
	mrkafk@...il.com, alexl@...hat.com, jack@...e.cz,
	tvrtko.ursulin@...hos.com, a.p.zijlstra@...llo.nl,
	hch@...radead.org, alan@...rguk.ukuu.org.uk, mmorley@....in,
	pavel@...e.cz
Subject: Re: fanotify - overall design before I start sending patches

On Mon, 2009-07-27 at 20:23 +0100, Jamie Lokier wrote:
> Andreas Dilger wrote:
> > On Jul 25, 2009  01:29 +0100, Jamie Lokier wrote:
> > > Eric Paris wrote:

> What's wrong with fanotify-using applications generating events when
> they modify files themselves?
> 
> An example was given where app A gets an event and modifies the file,
> then app B gets an event and modifies the file, and app A... cycling.

No the example was the 'open' which the kernel does on behalf of the
listener.  I'm thinking now I should only exclude

OPEN
OPEN_PERM
ACCESS_PERM

as those are the only 3 event types I can see deadlock/recursion
problems with.

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