linux-kernel - Re: [PATCH 09/12] target: Convert se_portal_group->tpg_lun

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Date:	Wed, 13 May 2015 09:22:04 +0200
From:	Juergen Gross <jgross@...e.com>
To:	Christoph Hellwig <hch@....de>,
	"Nicholas A. Bellinger" <nab@...erainc.com>
CC:	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Hannes Reinecke <hare@...e.de>,
	Sagi Grimberg <sagig@...lanox.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH 09/12] target: Convert se_portal_group->tpg_lun_list[]
 to RCU hlist

On 05/13/2015 08:24 AM, Christoph Hellwig wrote:
>
>> FIXME: Figure out how sbp-target se_lun usage should work
>
> The Xen usage also looks really weird.  Maybe Juergen can explain what
> scsiback_add_translation_entry is trying to do?

scsiback_add_translation_entry() makes the connection between a pvSCSI
LUN configured by the xen tools in xenstore and a xen-scsiback target.

The xen tools specify the pvSCSI LUN via <device>:<lun>, with <device>
being either the WWN of the target or an alias of that target specified
in config_fs.

scsiback_add_translation_entry() searches all it's targets until a match
is found and links the found tpg to the device specification of the xen
guest.

> Note that I think both
> sbp and xen really should be working on node ACLs.  Right now both
> of them oly supported autogenerated ACLs, so in practice it doesn't
> matter, but keeping the data structure use clean is a goal on it's own.

I'd be fine with this, but I think I'll need some hints how to achieve
this. I guess I have to specify .fabric_make_nodeacl and
.fabric_drop_nodeacl like e.g. done in drivers/vhost/scsi.c ? Is there
anything else I have to consider?

Juergen
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