linux-kernel - Re: [PATCH 0/5] Allow more than PAGESIZE data read in configfs

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Date:	Mon, 16 Oct 2006 16:09:13 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Chandra Seetharaman <sekharan@...ibm.com>
Cc:	Andrew Morton <akpm@...l.org>, Greg KH <greg@...ah.com>,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] Allow more than PAGESIZE data read in configfs

On Mon, Oct 16, 2006 at 12:24:35PM -0700, Chandra Seetharaman wrote:
> On Sat, 2006-10-14 at 13:10 -0700, Joel Becker wrote:
> > 	Issues of PAGE_SIZE and attribute size aside, the patch posted
> > was incorrect.  While they used seq_file, they implemented it in a
> 
> I do not think it is incorrect. It provides a simplest interface to
> configfs's clients.

	I understand that it provides a simple sed(1)-based change for
existing clients.  However, it abuses seq_file in exactly the wrong way.

> > completely inefficent fashion, filling the entire buffer in one ->show()
> > call rather than letting multiple read(2) calls iterate their list.
> 
> So, are you suggesting that we should provide a generic seq_operations
> interface to configfs's clients ?

	Yes, if we provide a vector type in any way, it should be via
seq_operations or something like it.  If we're going to use seq_file, we
should use it correctly.

Joel

-- 

"What no boss of a programmer can ever understand is that a programmer
 is working when he's staring out of the window"
	- With apologies to Burton Rascoe


Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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