linux-kernel - Re: [PATCH 1/9] task_struct: add PF

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Message-Id: <1251499168.28787.2.camel@dhcp231-106.rdu.redhat.com>
Date:	Fri, 28 Aug 2009 18:39:28 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	netdev@...r.kernel.org, davem@...emloft.net,
	viro@...iv.linux.org.uk, alan@...ux.intel.com, hch@...radead.org
Subject: Re: [PATCH 1/9] task_struct: add PF_NONOTIFY for fanotify to use

On Sat, 2009-08-29 at 02:36 +0400, Evgeniy Polyakov wrote:
> Hi.
> 
> On Fri, Aug 28, 2009 at 02:55:42PM -0400, Eric Paris (eparis@...hat.com) wrote:
> > Since fanotify opens file descriptors inside the kernel for it's listeners
> > it needs a way to make sure that 2 fanotify listeners, both which listen to
> > open events do not continuously see each others open events (and get into a
> > livelock reporting on each other's activity).  This fix is to create a new
> > tast_struct flags called PF_NONOTIFY.  If this flag is set in a task no
> > fanotify events will be generated for that task.   fanotify will set the
> > flag before and open call and will clear it immediately after.
> 
> Is there a way to get old-school notifications with the object
> information instead of opened file desriptor, which may suffer rlimit
> problems and scalability issues with too many opened/closed descriptors?

Use inotify.

-Eric

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