From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Garzik <jeff@garzik.org>
Subject: Re: [PATCH 2.6.16-rc6] Promise SuperTrak driver
Date: Thu, 16 Mar 2006 00:11:08 -0500
Message-ID: <4418F36C.1090508@garzik.org>
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To: Ed Lin <ed.lin@promise.com>
Cc: Matthew Wilcox <matthew@wil.cx>, "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>, "promise_linux@promise.com" <promise_linux@promise.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>

Ed Lin wrote:
> I think the tcq is good after reading the related kernel code. But driver
> still need to keep track of the tag for eh and flush. Maybe the driver
> can use find_first_zero_bit(), __set_bit(), and __test_and_clear_bit(),
> because this is what the block layer uses for tag operations.


Once mapped by the block layer, the tag should be accessible via struct
request::tag variable for the lifetime of the struct request.

	Jeff