Date: Wed, 15 Aug 2012 02:21:47 +0400
From: Cyrill Gorcunov <gorcunov@openvz.org>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Pavel Emelyanov <xemul@parallels.com>,
        James Bottomley <jbottomley@parallels.com>,
        Matthew Helsley <matt.helsley@gmail.com>
Subject: Re: [patch 3/8] procfs: Add ability to plug in auxiliary fdinfo
 providers
Message-ID: <20120814222147.GA21674@moon>
References: <20120814140342.354405844@openvz.org>
 <20120814140620.033884909@openvz.org>
 <20120814183142.GH23464@ZenIV.linux.org.uk>
 <20120814183558.GA1551@moon>
 <20120814195649.GB31043@moon>
 <20120814212721.GJ23464@ZenIV.linux.org.uk>
 <20120814215616.GC31043@moon>
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On Wed, Aug 15, 2012 at 01:56:16AM +0400, Cyrill Gorcunov wrote:
> > >  struct file_operations {
> > >  	struct module *owner;
> > > +	struct seq_operations *fdinfo_ops;
> > 
> > IDGI.  Why on the earth do you need the whole iterator?  All it takes
> > is show_fdinfo(struct seq_file *m, struct file *f); have ->show() in
> > your iterator (one going through the files) call that sucker for the
> > file we are trying to show.
> > 
> > I think you are severely overdesigning that thing...
> 
> Hmm, in very first versions I've been using one ->show method, but
> then I thought that this is not very correlate with seq-files idea
> where for each record show/next sequence is called. I'll update (this
> for sure will make code simplier, and I'll have to check for seq-file
> overflow after seq_printf call to not continue printing data for too
> long if buffer already out of space).

Al, I'll cook the whole series tomorrow and resend it for review,
also I guess the new show_fdinfo() member in file-operations should
be guarded with CONFIG_PROC_FS, right?
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