284 lines
6.8 KiB
C
284 lines
6.8 KiB
C
/* su: SCSI Universal. This is a universal SCSI device that
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* has a fixed minor number format. This allows you to refer
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* to your devices by BUS, ID, LUN instead of st0, st1, ...
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*
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* This code looks up the underlying device for a given SCSI
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* target and uses that driver.
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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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*
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* $Id: su.c,v 1.3 1995/01/08 15:56:10 dufault Exp $
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*
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* Tabstops 4
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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/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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/* XXX: These are taken from, and perhaps belong in, conf.c
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*/
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#define nxopen (d_open_t *)enxio
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#define nxclose (d_close_t *)enxio
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#define nxread (d_rdwr_t *)enxio
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#define nxwrite nxread
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#define nxstrategy (d_strategy_t *)enxio
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#define nxioctl (d_ioctl_t *)enxio
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#define nxdump (d_dump_t *)enxio
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#define nxstop (d_stop_t *)enxio
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#define nxreset (d_reset_t *)enxio
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#define nxselect (d_select_t *)enxio
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#define nxmmap (d_mmap_t *)enxio
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#define nxdevtotty (d_ttycv_t *)nullop
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#define zerosize (d_psize_t *)0
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/* bnxio, cnxio: non existent device entries
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*/
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static struct bdevsw bnxio = {
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nxopen,
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nxclose,
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nxstrategy,
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nxioctl,
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nxdump,
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zerosize,
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0
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};
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static struct cdevsw cnxio = {
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nxopen,
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nxclose,
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nxread,
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nxwrite,
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nxioctl,
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nxstop,
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nxreset,
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nxdevtotty,
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nxselect,
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nxmmap,
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nxstrategy
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};
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/* getsws: Look up the base dev switch for a given "by minor number" style
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* device.
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*/
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static int
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getsws(dev_t dev, int type,
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struct bdevsw **bdevp, struct cdevsw **cdevp, dev_t *base)
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{
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int ret = 0;
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struct scsi_link *scsi_link;
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int chr_dev, blk_dev;
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struct cdevsw *cdev;
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struct bdevsw *bdev;
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int bus = SCSI_BUS(dev),
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lun = SCSI_LUN(dev),
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id = SCSI_ID(dev);
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/* Try to look up the base device by finding the major number in
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* the scsi_link structure:
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*/
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if ((scsi_link = scsi_link_get(bus, id, lun)) == 0 ||
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scsi_link->dev == NODEV)
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{
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ret = ENXIO;
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/* XXX This assumes that you always have a character device if you
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* have a block device. That seems reasonable.
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*/
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cdev = &cnxio;
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chr_dev = NODEV;
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bdev = &bnxio;
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blk_dev = NODEV;
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}
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else
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{
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int bmaj, cmaj;
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cmaj = major(scsi_link->dev);
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cdev = cdevsw + cmaj;
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chr_dev = OLD_DEV(dev, scsi_link->dev);
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bmaj = chrtoblk(cmaj);
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bdev = (bmaj == NODEV) ? &bnxio : bdevsw + bmaj;
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blk_dev = OLD_DEV(dev, makedev(bmaj, minor(scsi_link->dev)));
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}
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if (cdevp)
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*cdevp = cdev;
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if (bdevp)
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*bdevp = bdev;
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if (type == S_IFCHR)
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*base = chr_dev;
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else
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*base = blk_dev;
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return ret;
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}
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int
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suopen(dev_t dev, int flag, int type, struct proc *p)
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{
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struct cdevsw *cdev;
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struct bdevsw *bdev;
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dev_t base;
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if (getsws(dev, type, &bdev, &cdev, &base))
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{
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/* Device not configured? Reprobe then try again.
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*/
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int bus = SCSI_BUS(dev), lun = SCSI_LUN(dev), id = SCSI_ID(dev);
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if (scsi_probe_bus(bus, id, lun) || getsws(dev, type, &bdev, &cdev,
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&base))
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return ENXIO;
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}
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/* There is a properly configured underlying device.
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* Synthesize an appropriate device number:
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*/
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if (type == S_IFCHR)
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return (*cdev->d_open)(base, flag, S_IFCHR, p);
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else
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return (*bdev->d_open)(base, flag, S_IFBLK, p);
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}
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int suclose(dev_t dev, int fflag, int type, struct proc *p)
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{
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struct cdevsw *cdev;
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struct bdevsw *bdev;
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dev_t base;
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(void)getsws(dev, type, &bdev, &cdev, &base);
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if (type == S_IFCHR)
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return (*cdev->d_close)(base, fflag, S_IFCHR, p);
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else
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return (*bdev->d_open)(base, fflag, S_IFBLK, p);
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}
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void sustrategy(struct buf *bp)
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{
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dev_t base;
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struct bdevsw *bdev;
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dev_t dev = bp->b_dev;
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/* XXX: I have no way of knowing if this was through the
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* block or the character entry point.
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*/
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(void)getsws(dev, S_IFBLK, &bdev, 0, &base);
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bp->b_dev = base;
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(*bdev->d_strategy)(bp);
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bp->b_dev = dev;
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}
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int suioctl(dev_t dev, int cmd, caddr_t data, int fflag, struct proc *p)
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{
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struct cdevsw *cdev;
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dev_t base;
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/* XXX: I have no way of knowing if this was through the
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* block or the character entry point.
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*/
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(void)getsws(dev, S_IFCHR, 0, &cdev, &base);
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return (*cdev->d_ioctl)(base, cmd, data, fflag, p);
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}
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int sudump(dev_t dev)
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{
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dev_t base;
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struct bdevsw *bdev;
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(void)getsws(dev, S_IFBLK, &bdev, 0, &base);
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return (*bdev->d_dump)(base);
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}
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int supsize(dev_t dev)
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{
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dev_t base;
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struct bdevsw *bdev;
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(void)getsws(dev, S_IFBLK, &bdev, 0, &base);
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return (*bdev->d_psize)(base);
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}
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int suread(dev_t dev, struct uio *uio, int ioflag)
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{
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dev_t base;
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struct cdevsw *cdev;
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(void)getsws(dev, S_IFCHR, 0, &cdev, &base);
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return (*cdev->d_read)(base, uio, ioflag);
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}
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int suwrite(dev_t dev, struct uio *uio, int ioflag)
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{
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dev_t base;
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struct cdevsw *cdev;
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(void)getsws(dev, S_IFCHR, 0, &cdev, &base);
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return (*cdev->d_write)(base, uio, ioflag);
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}
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int suselect(dev_t dev, int which, struct proc *p)
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{
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dev_t base;
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struct cdevsw *cdev;
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(void)getsws(dev, S_IFCHR, 0, &cdev, &base);
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return (*cdev->d_select)(base, which, p);
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}
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