linux-kernel - question about {target,expander,port}_id allocation for scsi_transport

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Date:	Tue, 21 Feb 2012 11:44:49 +0800
From:	Yang Bai <hamo.by@...il.com>
To:	JBottomley@...allels.com
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: question about {target,expander,port}_id allocation for scsi_transport_sas

Hi all,

I want to move there 3 id allocation from the simple way to ida. I
have some questions about this:

1. We have a struct sas_host_attrs to hold the 3 int for the next id
and a mutex for protect them. What's the purpose of the other 2
members (rphy_list and q). Are they related about these 3 id's
allocation?

2. Since for ida, we need a static struct, and for there 3 ids, we
need 3. Where can I store them? In the host's struct? Or somewhere
else?

Thanks and waiting for your help,
Yang
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