From aa6f6a3de18131348f70951efb2c56d806033e09 Mon Sep 17 00:00:00 2001
From: Corrado Zoccolo <czoccolo@gmail.com>
Date: Mon, 26 Oct 2009 22:44:33 +0100
Subject: [PATCH] cfq-iosched: preparation to handle multiple service trees

We embed a pointer to the service tree in each queue, to handle multiple
service trees easily.
Service trees are enriched with a counter.
cfq_add_rq_rb is invoked after putting the rq in the fifo, to ensure
that all fields in rq are properly initialized.

Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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