1 /* 2 * blktrace output analysis: generate a timeline & gather statistics 3 * 4 * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle (at) 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 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 */ 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
