1/*
2 * blktrace output analysis: generate a timeline & gather statistics
3 *
4 * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com>
5 *
6 *  This program is free software; you can redistribute it and/or modify
7 *  it under the terms of the GNU General Public License as published by
8 *  the Free Software Foundation; either version 2 of the License, or
9 *  (at your option) any later version.
10 *
11 *  This program is distributed in the hope that it will be useful,
12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *  GNU General Public License for more details.
15 *
16 *  You should have received a copy of the GNU General Public License
17 *  along with this program; if not, write to the Free Software
18 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 *
20 */
21#include "globals.h"
22
23static inline void cvt_pdu_remap(struct blk_io_trace_remap *rp)
24{
25	rp->device_from = be32_to_cpu(rp->device_from);
26	rp->device_to   = be32_to_cpu(rp->device_to);
27	rp->sector_from = be64_to_cpu(rp->sector_from);
28}
29
30/*
31 * q_iop == volume device
32 * a_iop == underlying device
33 */
34void trace_remap(struct io *a_iop)
35{
36	struct io *q_iop;
37	struct d_info *q_dip;
38	struct blk_io_trace_remap *rp;
39
40	if (ignore_remaps)
41		goto out;
42
43	rp = a_iop->pdu;
44	cvt_pdu_remap(rp);
45
46	if (!io_setup(a_iop, IOP_A))
47		goto out;
48
49	q_dip = __dip_find(rp->device_from);
50	if (!q_dip)
51		goto out;
52
53	q_iop = dip_find_sec(q_dip, IOP_Q, rp->sector_from);
54	if (q_iop)
55		update_q2a(q_iop, tdelta(q_iop->t.time, a_iop->t.time));
56
57out:
58	io_release(a_iop);
59}
60