BSD 4_3_Tahoe release

[unix-history] / usr / src / sys / stand / dev.c

/*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
*      @(#)dev.c       7.4 (Berkeley) 6/29/88
*/

#include "param.h"
#include "inode.h"
#include "fs.h"
#include "saio.h"

/*
* NB: the value "io->i_ino.i_dev", used to offset the devsw[] array
* in the routines below, is munged by the vaxstand Makefile to work
* for certain boots.
*/

devread(io)
       register struct iob *io;
{
       int cc;

       io->i_flgs |= F_RDDATA;
       io->i_error = 0;
       cc = (*devsw[io->i_ino.i_dev].dv_strategy)(io, READ);
       io->i_flgs &= ~F_TYPEMASK;
       return (cc);
}

devwrite(io)
       register struct iob *io;
{
       int cc;

       io->i_flgs |= F_WRDATA;
       io->i_error = 0;
       cc = (*devsw[io->i_ino.i_dev].dv_strategy)(io, WRITE);
       io->i_flgs &= ~F_TYPEMASK;
       return (cc);
}

devopen(io)
       register struct iob *io;
{
       int ret;

       if (!(ret = (*devsw[io->i_ino.i_dev].dv_open)(io)))
               return (0);
       printf("%s(%d,%d,%d,%d): ", devsw[io->i_ino.i_dev].dv_name,
               io->i_adapt, io->i_ctlr, io->i_unit, io->i_part);
       switch(ret) {
       case EIO:
               break;          /* already reported */
       case EADAPT:
               printf("bad adaptor number\n");
               break;
       case ECTLR:
               printf("bad controller number\n");
               break;
       case EUNIT:
               printf("bad drive number\n");
               break;
       case EPART:
               printf("bad partition\n");
               break;
       case ERDLAB:
               printf("can't read disk label\n");
               break;
       case EUNLAB:
               printf("unlabeled\n");
               break;
       case ENXIO:
               printf("bad device specification\n");
               break;
       default:
               printf("unknown open error\n");
               break;
       }
       return (ret);
}

devclose(io)
       register struct iob *io;
{
       (*devsw[io->i_ino.i_dev].dv_close)(io);
}

devioctl(io, cmd, arg)
       register struct iob *io;
       int cmd;
       caddr_t arg;
{
       return ((*devsw[io->i_ino.i_dev].dv_ioctl)(io, cmd, arg));
}

/*ARGSUSED*/
nullsys(io)
       struct iob *io;
{}

/*ARGSUSED*/
nodev(io)
       struct iob *io;
{
       errno = EBADF;
}

/*ARGSUSED*/
noioctl(io, cmd, arg)
       struct iob *io;
       int cmd;
       caddr_t arg;
{
       return (ECMD);
}