From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-fsdevel-owner@vger.kernel.org>
Received: from mail-wm0-f68.google.com ([74.125.82.68]:35668 "EHLO
        mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S936136AbeFORPY (ORCPT
        <rfc822;linux-fsdevel@vger.kernel.org>);
        Fri, 15 Jun 2018 13:15:24 -0400
Date: Fri, 15 Jun 2018 20:15:21 +0300
From: Alexey Dobriyan <adobriyan@gmail.com>
To: David Howells <dhowells@redhat.com>
Cc: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] proc: Make inline name size calculation automatic
Message-ID: <20180615171521.GA4417@avx2>
References: <20180614200956.GB7137@avx2>
 <15003.1529008242@warthog.procyon.org.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <15003.1529008242@warthog.procyon.org.uk>
Sender: linux-fsdevel-owner@vger.kernel.org
List-ID: <linux-fsdevel.vger.kernel.org>

On Thu, Jun 14, 2018 at 09:30:42PM +0100, David Howells wrote:
> Alexey Dobriyan <adobriyan@gmail.com> wrote:
> 
> > > Require a minimum inline name size of 33+1 to allow for names that look
> > > like two hex numbers with a dash between.
> > 
> > Why 34? /proc will fallback to separate allocation for name anyway.
> 
> See above comment.  I ran find on /proc and there were a bunch of files whose
> names were "<hex>-<hex>".  Allow for 16-char hex addresses and add a NUL char
> to that and you get 34.

Those must be /proc/*/map_files symlinks. If that's the case,
they don't have PDEs allocated.