sys/src/iosubrams.c

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// _Id: iosubrams.c,v 1.4 2009-05-10 21:16:05 roart Exp $
// _Locker:  $

// Author. Roar Thronæs.
/**
   \file iosubrams.c
   \brief QIO subroutines
   \author Roar Thronæs
*/

#include <linux/kernel.h>
#include <asmlink.h>
#include <linux/smp.h>
#include <linux/sched.h>
#include <asm/hw_irq.h>
#include <asm/current.h>
#include <system_data_cells.h>
#include <internals.h>
#include<queue.h>
#include<ddtdef.h>
#include<ucbdef.h>
#include<irpdef.h>
#include<ipldef.h>
#include<wcbdef.h>
#include<ssdef.h>

/**
   \brief map virtual block to logical block - see 5.2 21.8.2
   \param vbn virtual block number
   \param numbytes yet unused
   \param wcb window control block
   \param irp yet unused
   \param ucb yet unused
   \param lbn_p return logical block value
   \param notmapped_p yet unused
   \param new_ucb_p yet unused
*/

int ioc_std_mapvblk (unsigned int vbn, unsigned int numbytes, struct _wcb *wcb, struct _irp *irp, struct _ucb *ucb, unsigned int *lbn_p, unsigned *notmapped_p, struct _ucb **new_ucb_p) {
  struct _wcb * head=wcb;
  struct _wcb * tmp=head->wcb_l_wlfl;
  while (tmp!=head) {
    if (vbn>=tmp->wcb_l_stvbn && vbn<(tmp->wcb$l_stvbn+tmp->wcb$l_p1_count)) {
      *lbn_p=tmp->wcb_l_p1_lbn+(vbn-tmp->wcb$l_stvbn);
      return SS__NORMAL;
    }
    tmp=tmp->wcb_l_wlfl;
  }
  return 0;
}

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