linux-kernel - Re: [PATCH 2/5] tcm: Unify INQUIRY subsystem plugin handling

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Date:	Wed, 13 Oct 2010 13:19:49 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Christoph Hellwig <hch@....de>
Cc:	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>,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Jens Axboe <axboe@...nel.dk>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	Richard Sharpe <realrichardsharpe@...il.com>
Subject: Re: [PATCH 2/5] tcm: Unify INQUIRY subsystem plugin handling

On Wed, 2010-10-13 at 13:06 +0200, Christoph Hellwig wrote:
> On Wed, Oct 13, 2010 at 01:48:01AM -0700, Nicholas A. Bellinger wrote:
> > From: Nicholas Bellinger <nab@...ux-iscsi.org>
> > 
> > This patch adds the following two struct se_subsystem_api function pointer
> > ops for INQUIRY emulation reponse payload Product and Product Rev:
> 
> FYI, I'd wonder if it wouldn't be easier to store this and the number
> of blocks data directly in struct se_device instead of adding methods.
> 
> That means they just need to be initialized once at device creation time
> and the code in the backends becomes simpler again.  This also applies
> to many of the get_ prefix methods, e.g. get_max_cdb_len, get_blocksize,
> etc.

I should point out that the majority of values mentioned here (other
than the two INQUIRY strings) are already present in struct
se_dev_attrib and which appear as configfs attributes under
under /sys/kernel/config/target/core/$HBA/$DEV/attrib/.  This means that
the struct se_subsystem_api calls only really used by during init
target_core_device.c:se_dev_set_default_attribs() and
DEV_ATTRIB(dev)->block_size, etc are used in TCM Core code.

I am happy to include the two INQUIRY strings needed for emulation into
struct se_subsystem_api directly, but I would still prefer to keep the
function pointers for extracting values from subsystem specific code for
the initial device attribute setup.

--nab


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