linux-kernel - Re: [PATCH 01/12] target: Convert se_node_acl->device

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Message-ID: <20150517165142.GA17217@lst.de>
Date:	Sun, 17 May 2015 18:51:42 +0200
From:	Christoph Hellwig <hch@....de>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	Christoph Hellwig <hch@....de>,
	"Nicholas A. Bellinger" <nab@...erainc.com>,
	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>
Subject: Re: [PATCH 01/12] target: Convert se_node_acl->device_list[] to
	RCU hlist

On Wed, May 13, 2015 at 01:46:11AM -0700, Nicholas A. Bellinger wrote:
> Updated to use a mirror lun->lun_rtpi, with the assignment from sep_rtpi
> occuring in core_dev_export() code.

>From looking at your current tree I suspect freeing the se_port structure
using kfree_rcu might be a better idea.  Together with dropping the references
to the se_device from call_rcu context this basically means all pointers
in struct se_lun are rcu protected which is much safer if you want
to access struct se_lun under rcu protection, as this avoids having to
deal with special cases.  Additionally that basically allows you to
replace lun_sep_lock with rcu_read_lock for anything remotely like
a fast path.
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