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/*

 * drivers/scsi/sd_ioctl.c

 *

 * ioctl handling for SCSI disks

 */

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/mm.h>

#include <linux/fs.h>

#include <linux/hdreg.h>

#include <linux/errno.h>

#include <asm/segment.h>

#include <linux/blk.h>

#include "scsi.h"

#include <scsi/scsi_ioctl.h>

#include "hosts.h"

#include "sd.h"

#include <scsi/scsicam.h>     /* must follow "hosts.h" */

int sd_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg)

{

    kdev_t dev = inode->i_rdev;

    int error;

    struct Scsi_Host * host;

    int diskinfo[4];

    struct hd_geometry *loc = (struct hd_geometry *) arg;

    switch (cmd) {

    case HDIO_GETGEO:   /* Return BIOS disk parameters */

        if (!loc)  return -EINVAL;

        error = verify_area(VERIFY_WRITE, loc, sizeof(*loc));

        if (error)

            return error;

        host = rscsi_disks[MINOR(dev) >> 4].device->host;

/* default to most commonly used values */

        diskinfo[0] = 0x40;

        diskinfo[1] = 0x20;

        diskinfo[2] = rscsi_disks[MINOR(dev) >> 4].capacity >> 11;

/* override with calculated, extended default, or driver values */

        if(host->hostt->bios_param != NULL)

            host->hostt->bios_param(&rscsi_disks[MINOR(dev) >> 4],

                                    dev,

                                    &diskinfo[0]);

        else scsicam_bios_param(&rscsi_disks[MINOR(dev) >> 4],

                                dev, &diskinfo[0]);

        put_user(diskinfo[0], &loc->heads);

        put_user(diskinfo[1], &loc->sectors);

        put_user(diskinfo[2], &loc->cylinders);

        put_user(sd[MINOR(inode->i_rdev)].start_sect, &loc->start);

        return 0;

    case BLKGETSIZE:   /* Return device size */

        if (!arg)  return -EINVAL;

        error = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));

        if (error)

            return error;

        put_user(sd[MINOR(inode->i_rdev)].nr_sects,

                 (long *) arg);

        return 0;

    case BLKRASET:

        if (!suser())

                return -EACCES;

        if(!(inode->i_rdev)) return -EINVAL;

        if(arg > 0xff) return -EINVAL;

        read_ahead[MAJOR(inode->i_rdev)] = arg;

        return 0;

    case BLKRAGET:

        if (!arg)

                return -EINVAL;

        error = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));

        if (error)

            return error;

        put_user(read_ahead[MAJOR(inode->i_rdev)], (int *) arg);

        return 0;

    case BLKFLSBUF:

        if(!suser())  return -EACCES;

        if(!(inode->i_rdev)) return -EINVAL;

        fsync_dev(inode->i_rdev);

        invalidate_buffers(inode->i_rdev);

        return 0;

    case BLKRRPART: /* Re-read partition tables */

        return revalidate_scsidisk(dev, 1);

    RO_IOCTLS(dev, arg);

    default:

        return scsi_ioctl(rscsi_disks[MINOR(dev) >> 4].device , cmd, (void *) arg);

    }

}

/*

 * Overrides for Emacs so that we follow Linus's tabbing style.

 * Emacs will notice this stuff at the end of the file and automatically

 * adjust the settings for this buffer only.  This must remain at the end

 * of the file.

 * ---------------------------------------------------------------------------

 * Local variables:

 * c-indent-level: 4

 * c-brace-imaginary-offset: 0

 * c-brace-offset: -4

 * c-argdecl-indent: 4

 * c-label-offset: -4

 * c-continued-statement-offset: 4

 * c-continued-brace-offset: 0

 * indent-tabs-mode: nil

 * tab-width: 8

 * End:

 */