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83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
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/* "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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*/
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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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