/*
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* blktrace output analysis: generate a timeline & gather statistics
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*
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* Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "globals.h"
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static inline void cvt_pdu_remap(struct blk_io_trace_remap *rp)
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{
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rp->device_from = be32_to_cpu(rp->device_from);
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rp->device_to = be32_to_cpu(rp->device_to);
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rp->sector_from = be64_to_cpu(rp->sector_from);
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}
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/*
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* q_iop == volume device
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* a_iop == underlying device
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*/
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void trace_remap(struct io *a_iop)
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{
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struct io *q_iop;
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struct d_info *q_dip;
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struct blk_io_trace_remap *rp;
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if (ignore_remaps)
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goto out;
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rp = a_iop->pdu;
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cvt_pdu_remap(rp);
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if (!io_setup(a_iop, IOP_A))
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goto out;
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q_dip = __dip_find(rp->device_from);
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if (!q_dip)
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goto out;
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q_iop = dip_find_sec(q_dip, IOP_Q, rp->sector_from);
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if (q_iop)
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update_q2a(q_iop, tdelta(q_iop->t.time, a_iop->t.time));
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out:
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io_release(a_iop);
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}
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