linux-kernel - Re: struct fanotify_event

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Date:	Thu, 19 Aug 2010 18:07:01 +0200
From:	Andreas Gruenbacher <agruen@...e.de>
To:	Tvrtko Ursulin <tvrtko.ursulin@...hos.com>
Cc:	Andreas Schwab <schwab@...ux-m68k.org>,
	Eric Paris <eparis@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: struct fanotify_event_metadata

On Thursday 19 August 2010 17:44:29 Tvrtko Ursulin wrote:
> On Saturday 14 Aug 2010 18:44:38 Andreas Schwab wrote:
> > The pid field of struct fanotify_event_metadata has 64 bits which looks
> > excessive.  Wouldn't it make sense to make it 32 bits and swap it with
> > the mask field?  That would avoid the unaligned mask field, and remove
> > the need for the packed attribute.
> 
> No one seems to have picked up on this what I thought was an obvious good
> idea.

Yes, the pid field should be shrunk; it is a 32-bit value in user-space even 
on 64-bit platforms.  I also don't see that we'll ever need a 64-bit mask 
actually.

Andreas
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