122 lines
4.0 KiB
C
122 lines
4.0 KiB
C
/* "superscsi" pseudo device. This requires options SCSISUPER.
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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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* $Id:$
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*/
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#include <sys/types.h>
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#include <sys/conf.h>
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#include <scsi/scsiconf.h>
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#include <sys/scsiio.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/buf.h>
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#include <sys/systm.h>
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static dev_t sscdev = NODEV;
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int 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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int 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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int 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 =
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SCSI_MKSUPER(SCSI_MKDEV(sca->scbus,sca->lun,sca->target));
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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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/* I've elected not to support any of these other entries. There
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* really is no good reason other than I'm not sure how you would use
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* them.
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*/
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int sscstrategy(struct buf *bp) { return ENXIO; }
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int sscdump(dev_t dev) { return ENXIO; }
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int sscpsize(dev_t dev) { return ENXIO; }
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int sscread(dev_t dev, struct uio *uio, int ioflag) { return ENXIO; }
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int sscwrite(dev_t dev, struct uio *uio, int ioflag) { return ENXIO; }
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int sscselect(dev_t dev, int which, struct proc *p) { return ENXIO; }
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