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

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Message-Id: <1287030937.9909.30.camel@haakon2.linux-iscsi.org>
Date:	Wed, 13 Oct 2010 21:35:37 -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 Thu, 2010-10-14 at 02:04 +0200, Christoph Hellwig wrote:
> On Wed, Oct 13, 2010 at 01:19:49PM -0700, Nicholas A. Bellinger wrote:
> > 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.
> 
> What's the point?  It's a lot of boilerplate code that does nothing
> but obsfucating what's actually going on there.
> 

So you would rather have struct se_device attributes set in TCM
subsystem specific ->create_virtdevice() code directly after
transport_add_device_to_core_hba() -> se_dev_set_default_attribs(),
right..?

Performing the assignment of these attribute values from the same local
functions and dropping the extra struct se_subsystem_api callers would
be fine with me, but I honestly don't see how these handful of subsystem
API callers with obvious names adds obsfucation while TCM code is using
struct se_device->$ATTR_NAME to enforce device limits in I/O path
code...?

Thanks for your comments.. ;)

--nab

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