#include <linux/kernel.h>#include <linux/sched.h>#include <linux/fs.h>#include <linux/hdreg.h>#include <linux/errno.h>#include <asm/segment.h>#include "../block/blk.h"#include "scsi.h"#include "scsi_ioctl.h"#include "hosts.h"#include "sd.h"extern int revalidate_scsidisk(int, int);int sd_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg){	int 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_REQ:   /* 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;			diskinfo[0] = 0;			diskinfo[1] = 0;			diskinfo[2] = 0;			if(host->hostt->bios_param != NULL)			      host->hostt->bios_param(rscsi_disks[MINOR(dev) >> 4].capacity,							  dev,							  &diskinfo[0]);			put_fs_byte(diskinfo[0],				(char *) &loc->heads);			put_fs_byte(diskinfo[1],				(char *) &loc->sectors);			put_fs_word(diskinfo[2],				(short *) &loc->cylinders);			put_fs_long(sd[MINOR(inode->i_rdev)].start_sect,				(long *) &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_fs_long(sd[MINOR(inode->i_rdev)].nr_sects,				(long *) 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);		default:			return scsi_ioctl(rscsi_disks[MINOR(dev) >> 4].device , cmd, (void *) arg);	}}