linux-kernel - Re: [RFCv3 00/21] TCM Core and TCM

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Date:	Mon, 8 Nov 2010 16:48:25 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Jens Axboe <axboe@...nel.dk>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Joel Becker <joel.becker@...cle.com>
Subject: Re: [RFCv3 00/21] TCM Core and TCM_Loop patches for v2.6.37

On Mon, Nov 08, 2010 at 01:20:07PM -0800, Nicholas A. Bellinger wrote:
> Hmmm, it is my understanding that seq_file is currently not available
> for configfs.  Also, we never going to expect these particular calls to
> return anything close to PAGE_SIZE, so I am not sure how much of an
> issue this really is.

Seq_file is avaible for anything where you can plug in file_operations.
If configfs doesn't allow plugging in file_operations that's a serious
deficit.  If you need less than a page of data single_open provides a
simplified version of seq_file with a similar but much simpler API.

> >  - the set_configfs_dev_params method implementation contains some
> >    rather nast parsing code.  They look like they really should use
> >    the parser.h helpers we use for mount option parsing.
> 
> <nod>  This code current expects the the incoming buffer to be in the
> form of 'key0=value0,key1=value1,key2=value2' etc.   Assuming that
> parser.h code can handle the comma seperated values, I will look at
> getting these converted as well.

That's exactly how mount options work.

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