linux-kernel - Re: [patch 3/8] procfs: Add ability to plug in auxiliary fdinfo providers

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Message-ID: <20120814215616.GC31043@moon>
Date:	Wed, 15 Aug 2012 01:56:16 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>
Subject: Re: [patch 3/8] procfs: Add ability to plug in auxiliary fdinfo
 providers

On Tue, Aug 14, 2012 at 10:27:21PM +0100, Al Viro wrote:
> On Tue, Aug 14, 2012 at 11:56:49PM +0400, Cyrill Gorcunov wrote:
> > Al, does the patch below looks better? If so I'll fix up the rest.
> 
> >  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).

	Cyrill
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