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
cvt_pdu_remap(struct blk_io_trace_remap * rp)23 static 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 */
trace_remap(struct io * a_iop)34 void 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
57 out:
58 io_release(a_iop);
59 }
60