Major revamping (ver 2.0)

[blktrace.git] / btt / trace_remap.c

/*
 * blktrace output analysis: generate a timeline & gather statistics
 *
 * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include "globals.h"

static void handle_remap(struct io *a_iop)
{
	struct blk_io_trace_remap *rp = a_iop->pdu;
	struct io *q_iop;

	q_iop = dip_find_sec(a_iop->dip, IOP_Q, be64_to_cpu(rp->sector));
	if (q_iop) 
		update_q2a(q_iop, tdelta(q_iop->t.time, a_iop->t.time));
}

void trace_remap(struct io *a_iop)
{
	struct blk_io_trace_remap *rp = a_iop->pdu;

	a_iop->t.device = be32_to_cpu(rp->device_from);
	if (io_setup(a_iop, IOP_A))
		handle_remap(a_iop);

	io_release(a_iop);
}