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

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Date:	Wed, 29 Jul 2009 16:11:03 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Jamie Lokier <jamie@...reable.org>, david@...g.hm,
	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, 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
Subject: Re: fanotify - overall design before I start sending patches

On Mon, 2009-07-27 at 21:52 +0400, Evgeniy Polyakov wrote:
> Hi.
> 
> On Fri, Jul 24, 2009 at 10:44:01PM +0100, Jamie Lokier (jamie@...reable.org) wrote:
> > > No, I will NOT EVER pass a pathname.  Period.  End of story.  I stated
> > > the if userspace wants to deal with pathnames (and they understand the
> > > system setup well enough to know if pathnames even make sense to them)
> > > they can use readlink(2) on /proc/self/fd
> > 
> > That makes sense.
> > 
> > In most cases where events trigger userspace cache or index updates,
> > userspace already has enough information to calculate the path (and
> > any derived data) from the inode number (in the case of non-hard-link
> > files) or from the inode number of the parent directory and the name
> > (not full path).
> 
> Except that rlimits may forbid to open new file descriptor while queue
> length is enough to put another event with the full or partial path
> name.
> 
> I will read initial mail next, but if it is not described there, how
> rlimit problem is handled?

At the moment if you run out of rlimit fds you start getting (useless)
events with the fd equal to some errno (don't remember what hitting
rlimit errno is offhand)

-Eric

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