158 lines
4.5 KiB
C
158 lines
4.5 KiB
C
/* "superscsi" pseudo device.
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* "superscsi" supports general SCSI utilities that can iterate
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* over all SCSI targets, including those without device entry
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* points.
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*
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* "superscsi" supports the SCIOCADDR ioctl to change the BUS, ID, LUN
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* of the target so that you can get to all devices. The only thing
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* you can do to "superscsi" is open it, set the target, perform ioctl
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* calls, and close it.
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*
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* Keep "superscsi" protected: you can drive a truck through the
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* security hole if you don't.
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*
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*Begin copyright
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*
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* Copyright (C) 1993, 1994, 1995, HD Associates, Inc.
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* PO Box 276
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* Pepperell, MA 01463
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* 508 433 5266
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* dufault@hda.com
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*
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* This code is contributed to the University of California at Berkeley:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*End copyright
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* $Id: ssc.c,v 1.9 1995/12/08 23:22:26 phk Exp $
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/scsiio.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <sys/buf.h>
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#include <sys/systm.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#include <scsi/scsiconf.h>
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static d_open_t sscopen;
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static d_close_t sscclose;
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static d_ioctl_t sscioctl;
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extern d_open_t suopen;
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extern d_close_t suclose;
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extern d_ioctl_t suioctl;
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#define CDEV_MAJOR 49
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static struct cdevsw ssc_cdevsw =
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{ sscopen, sscclose, noread, nowrite, /*49*/
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sscioctl, nostop, nullreset, nodevtotty,
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noselect, nommap, nostrategy, "ssc", NULL, -1 };
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static dev_t sscdev = NODEV;
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static int
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sscopen(dev_t dev, int flag, int type, struct proc *p)
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{
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if (sscdev != NODEV)
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return suopen(sscdev, flag, type, p);
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return 0;
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}
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static int
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sscclose(dev_t dev, int fflag, int type, struct proc *p)
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{
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if (sscdev != NODEV)
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return suclose(sscdev, fflag, type, p);
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return 0;
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}
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static int
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sscioctl(dev_t dev, int cmd, caddr_t data, int fflag, struct proc *p)
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{
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if (cmd == SCIOCADDR)
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{
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struct scsi_addr *sca = (struct scsi_addr *) data;
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dev_t newdev = SCSI_MKFIXED(sca->scbus,sca->target,sca->lun);
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int ret;
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if (sscdev != NODEV)
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{
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suclose(sscdev, fflag, S_IFCHR, p);
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sscdev = NODEV;
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}
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if ( (ret = suopen(newdev, fflag, S_IFCHR, p)) )
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return ret;
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sscdev = newdev;
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return 0;
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}
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if (sscdev != NODEV)
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return suioctl(sscdev, cmd, data, fflag, p);
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return ENXIO;
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}
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/*
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* I've elected not to support any other entries. There really is no
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* good reason other than I'm not sure how you would use them.
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*/
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static ssc_devsw_installed = 0;
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static void *ssc_devfs_token;
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static void
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ssc_drvinit(void *unused)
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{
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dev_t dev;
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if( ! ssc_devsw_installed ) {
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev,&ssc_cdevsw, NULL);
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ssc_devsw_installed = 1;
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#ifdef DEVFS
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ssc_devfs_token = devfs_add_devsw(
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"/scsi", "ssc", &ssc_cdevsw, 0,
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DV_CHR, 0, 0, 0600);
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#endif
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}
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}
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SYSINIT(sscdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ssc_drvinit,NULL)
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