netdev - Re: fanotify as syscalls

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Message-Id: <200909222338.32646.agruen@suse.de>
Date:	Tue, 22 Sep 2009 23:38:32 +0200
From:	Andreas Gruenbacher <agruen@...e.de>
To:	Eric Paris <eparis@...hat.com>
Cc:	Jamie Lokier <jamie@...reable.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	netdev@...r.kernel.org, viro@...iv.linux.org.uk,
	alan@...ux.intel.com, hch@...radead.org
Subject: Re: fanotify as syscalls

On Tuesday, 22 September 2009 23:06:16 Eric Paris wrote:
> this is true, if there is only one namespace subtree notification works
> the same as global notification.
>
> [...]
>
> I don't see how subtree notification can possibly solve the global
> notification problem.

I'm thinking of is something like this: A listener registers interest in "/", 
recursively. The kernel sets a FSNOTIFY_WATCH_RECURSIVE flag on "/" and each 
mount point below. Afterwards when something is mounted anywhere, same 
namespace or not, the kernel sets the new mount's FSNOTIFY_WATCH_RECURSIVE 
flag if the parent mount has this flag set.

(Of course we need per fsnotify_group flags and not global ones, but this 
doesn't change the principle.)

Andreas
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