linux-kernel - Re: [RFC v2 05/21] tcm: Add ConfigFS subsystem backstore infrastructure

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Date:	Wed, 06 Oct 2010 16:13:55 +0400
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	nab@...ux-iscsi.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, michaelc@...wisc.edu, hch@....de,
	hare@...e.de, James.Bottomley@...e.de, axboe@...nel.dk,
	bharrosh@...asas.com
Subject: Re: [RFC v2 05/21] tcm: Add ConfigFS subsystem backstore infrastructure

FUJITA Tomonori, on 10/06/2010 11:25 AM wrote:
>>> The main issue here is that the user still needs to know the $LPORT_WWPN
>>> before hand (either from looking at a sticker on the card, or via
>>> another method) in order to preform the initial TFO->fabric_make_wwn()
>>> -> $TCM_MOD_make_wwn() operation.  So what we need is a configfs attrib
>>> at the top level TCM fabric group in order to see a list of the
>>> available hardware ports from the specific $TCM_MOD.  What I was
>>> thinking for TCM HW fabric module ports would be to have something like:
>>>
>>> 	/sys/kernel/config/target/$TCM_MOD/hw_ports
>>>
>>> that would walk the struct pci_dev looking for fabric module specific HW
>>> target mode capabilities.  I assume this is what you had in mind for
>>> drivers/scsi/ibmvscsi as well, yes..?
>>
>> Doesn't sound so.
>>
>> I want the driver to create necessary target directories in
>> /sys/kernel/config/target/ibmvscsit/ automatically.
> 
> In addition, I also think that /sys/kernel/config/target/$TCM_MOD
> should show up automatically when I load the module.
> 
> vine:/home/fujita# modprobe iscsi_target_mod
> 
> Then why do I need to create iscsi directory by hand?

Hello Tomonori,

Welcome to the world of configfs-based SCSI target configuration
infrastructure!

Configfs is user space driven and only by user space. This is the main
reason why I from the very beginning have writing that it isn't suitable
for managing SCSI targets.

Needless to say that SCST's sysfs-based configuration infrastructure
doesn't suffer from this limitation and allows creation of entries from
both kernel and user spaces.

Vlad
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