static int cciss_ioctl(struct inode *inode, struct file *filep,
		       unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct gendisk *disk = bdev->bd_disk;
	ctlr_info_t *host = get_host(disk);
	drive_info_struct *drv = get_drv(disk);
	int ctlr = host->ctlr;
	void __user *argp = (void __user *)arg;

#ifdef CCISS_DEBUG
	printk(KERN_DEBUG "cciss_ioctl: Called with cmd=%x %lx\n", cmd, arg);
#endif				/* CCISS_DEBUG */

	switch (cmd) {
	case CCISS_GETPCIINFO:
		{
			cciss_pci_info_struct pciinfo;

			if (!arg)
				return -EINVAL;
			pciinfo.domain = pci_domain_nr(host->pdev->bus);
			pciinfo.bus = host->pdev->bus->number;
			pciinfo.dev_fn = host->pdev->devfn;
			pciinfo.board_id = host->board_id;
			if (copy_to_user
			    (argp, &pciinfo, sizeof(cciss_pci_info_struct)))
				return -EFAULT;
			return 0;
		}
	case CCISS_GETINTINFO:
		{
			cciss_coalint_struct intinfo;
			if (!arg)
				return -EINVAL;
			intinfo.delay =
			    readl(&host->cfgtable->HostWrite.CoalIntDelay);
			intinfo.count =
			    readl(&host->cfgtable->HostWrite.CoalIntCount);
			if (copy_to_user
			    (argp, &intinfo, sizeof(cciss_coalint_struct)))
				return -EFAULT;
			return 0;
		}
	case CCISS_SETINTINFO:
		{
			cciss_coalint_struct intinfo;
			unsigned long flags;
			int i;

			if (!arg)
				return -EINVAL;
			if (!capable(CAP_SYS_ADMIN))
				return -EPERM;
			if (copy_from_user
			    (&intinfo, argp, sizeof(cciss_coalint_struct)))
				return -EFAULT;
			if ((intinfo.delay == 0) && (intinfo.count == 0))
			{
//                      printk("cciss_ioctl: delay and count cannot be 0\n");
				return -EINVAL;
			}
			spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
			/* Update the field, and then ring the doorbell */
			writel(intinfo.delay,
			       &(host->cfgtable->HostWrite.CoalIntDelay));
			writel(intinfo.count,
			       &(host->cfgtable->HostWrite.CoalIntCount));
			writel(CFGTBL_ChangeReq, host->vaddr + SA5_DOORBELL);

			for (i = 0; i < MAX_IOCTL_CONFIG_WAIT; i++) {
				if (!(readl(host->vaddr + SA5_DOORBELL)
				      & CFGTBL_ChangeReq))
					break;
				/* delay and try again */
				udelay(1000);
			}
			spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
			if (i >= MAX_IOCTL_CONFIG_WAIT)
				return -EAGAIN;
			return 0;
		}
	case CCISS_GETNODENAME:
		{
			NodeName_type NodeName;
			int i;

			if (!arg)
				return -EINVAL;
			for (i = 0; i < 16; i++)
				NodeName[i] =
				    readb(&host->cfgtable->ServerName[i]);
			if (copy_to_user(argp, NodeName, sizeof(NodeName_type)))
				return -EFAULT;
			return 0;
		}
	case CCISS_SETNODENAME:
		{
			NodeName_type NodeName;
			unsigned long flags;
			int i;

			if (!arg)
				return -EINVAL;
			if (!capable(CAP_SYS_ADMIN))
				return -EPERM;

			if (copy_from_user
			    (NodeName, argp, sizeof(NodeName_type)))
				return -EFAULT;

			spin_lock_irqsave(CCISS_LOCK(ctlr), flags);

			/* Update the field, and then ring the doorbell */
			for (i = 0; i < 16; i++)
				writeb(NodeName[i],
				       &host->cfgtable->ServerName[i]);

			writel(CFGTBL_ChangeReq, host->vaddr + SA5_DOORBELL);

			for (i = 0; i < MAX_IOCTL_CONFIG_WAIT; i++) {
				if (!(readl(host->vaddr + SA5_DOORBELL)
				      & CFGTBL_ChangeReq))
					break;
				/* delay and try again */
				udelay(1000);
			}
			spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
			if (i >= MAX_IOCTL_CONFIG_WAIT)
				return -EAGAIN;
			return 0;
		}

	case CCISS_GETHEARTBEAT:
		{
			Heartbeat_type heartbeat;

			if (!arg)
				return -EINVAL;
			heartbeat = readl(&host->cfgtable->HeartBeat);
			if (copy_to_user
			    (argp, &heartbeat, sizeof(Heartbeat_type)))
				return -EFAULT;
			return 0;
		}
	case CCISS_GETBUSTYPES:
		{
			BusTypes_type BusTypes;

			if (!arg)
				return -EINVAL;
			BusTypes = readl(&host->cfgtable->BusTypes);
			if (copy_to_user
			    (argp, &BusTypes, sizeof(BusTypes_type)))
				return -EFAULT;
			return 0;
		}
	case CCISS_GETFIRMVER:
		{
			FirmwareVer_type firmware;

			if (!arg)
				return -EINVAL;
			memcpy(firmware, host->firm_ver, 4);

			if (copy_to_user
			    (argp, firmware, sizeof(FirmwareVer_type)))
				return -EFAULT;
			return 0;
		}
	case CCISS_GETDRIVVER:
		{
			DriverVer_type DriverVer = DRIVER_VERSION;

			if (!arg)
				return -EINVAL;

			if (copy_to_user
			    (argp, &DriverVer, sizeof(DriverVer_type)))
				return -EFAULT;
			return 0;
		}

	case CCISS_REVALIDVOLS:
		return rebuild_lun_table(host, NULL);

	case CCISS_GETLUNINFO:{
			LogvolInfo_struct luninfo;

			luninfo.LunID = drv->LunID;
			luninfo.num_opens = drv->usage_count;
			luninfo.num_parts = 0;
			if (copy_to_user(argp, &luninfo,
					 sizeof(LogvolInfo_struct)))
				return -EFAULT;
			return 0;
		}
	case CCISS_DEREGDISK:
		return rebuild_lun_table(host, disk);

	case CCISS_REGNEWD:
		return rebuild_lun_table(host, NULL);

	case CCISS_PASSTHRU:
		{
			IOCTL_Command_struct iocommand;
			CommandList_struct *c;
			char *buff = NULL;
			u64bit temp64;
			unsigned long flags;
			DECLARE_COMPLETION_ONSTACK(wait);

			if (!arg)
				return -EINVAL;

			if (!capable(CAP_SYS_RAWIO))
				return -EPERM;

			if (copy_from_user
			    (&iocommand, argp, sizeof(IOCTL_Command_struct)))
				return -EFAULT;
			if ((iocommand.buf_size < 1) &&
			    (iocommand.Request.Type.Direction != XFER_NONE)) {
				return -EINVAL;
			}
#if 0				/* 'buf_size' member is 16-bits, and always smaller than kmalloc limit */
			/* Check kmalloc limits */
			if (iocommand.buf_size > 128000)
				return -EINVAL;
#endif
			if (iocommand.buf_size > 0) {
				buff = kmalloc(iocommand.buf_size, GFP_KERNEL);
				if (buff == NULL)
					return -EFAULT;
			}
			if (iocommand.Request.Type.Direction == XFER_WRITE) {
				/* Copy the data into the buffer we created */
				if (copy_from_user
				    (buff, iocommand.buf, iocommand.buf_size)) {
					kfree(buff);
					return -EFAULT;
				}
			} else {
				memset(buff, 0, iocommand.buf_size);
			}
			if ((c = cmd_alloc(host, 0)) == NULL) {
				kfree(buff);
				return -ENOMEM;
			}
			// Fill in the command type
			c->cmd_type = CMD_IOCTL_PEND;
			// Fill in Command Header
			c->Header.ReplyQueue = 0;	// unused in simple mode
			if (iocommand.buf_size > 0)	// buffer to fill
			{
				c->Header.SGList = 1;
				c->Header.SGTotal = 1;
			} else	// no buffers to fill
			{
				c->Header.SGList = 0;
				c->Header.SGTotal = 0;
			}
			c->Header.LUN = iocommand.LUN_info;
			c->Header.Tag.lower = c->busaddr;	// use the kernel address the cmd block for tag

			// Fill in Request block
			c->Request = iocommand.Request;

			// Fill in the scatter gather information
			if (iocommand.buf_size > 0) {
				temp64.val = pci_map_single(host->pdev, buff,
					iocommand.buf_size,
					PCI_DMA_BIDIRECTIONAL);
				c->SG[0].Addr.lower = temp64.val32.lower;
				c->SG[0].Addr.upper = temp64.val32.upper;
				c->SG[0].Len = iocommand.buf_size;
				c->SG[0].Ext = 0;	// we are not chaining
			}
			c->waiting = &wait;

			/* Put the request on the tail of the request queue */
			spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
			addQ(&host->reqQ, c);
			host->Qdepth++;
			start_io(host);
			spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);

			wait_for_completion(&wait);

			/* unlock the buffers from DMA */
			temp64.val32.lower = c->SG[0].Addr.lower;
			temp64.val32.upper = c->SG[0].Addr.upper;
			pci_unmap_single(host->pdev, (dma_addr_t) temp64.val,
					 iocommand.buf_size,
					 PCI_DMA_BIDIRECTIONAL);

			/* Copy the error information out */
			iocommand.error_info = *(c->err_info);
			if (copy_to_user
			    (argp, &iocommand, sizeof(IOCTL_Command_struct))) {
				kfree(buff);
				cmd_free(host, c, 0);
				return -EFAULT;
			}

			if (iocommand.Request.Type.Direction == XFER_READ) {
				/* Copy the data out of the buffer we created */
				if (copy_to_user
				    (iocommand.buf, buff, iocommand.buf_size)) {
					kfree(buff);
					cmd_free(host, c, 0);
					return -EFAULT;
				}
			}
			kfree(buff);
			cmd_free(host, c, 0);
			return 0;
		}
	case CCISS_BIG_PASSTHRU:{
			BIG_IOCTL_Command_struct *ioc;
			CommandList_struct *c;
			unsigned char **buff = NULL;
			int *buff_size = NULL;
			u64bit temp64;
			unsigned long flags;
			BYTE sg_used = 0;
			int status = 0;
			int i;
			DECLARE_COMPLETION_ONSTACK(wait);
			__u32 left;
			__u32 sz;
			BYTE __user *data_ptr;

			if (!arg)
				return -EINVAL;
			if (!capable(CAP_SYS_RAWIO))
				return -EPERM;
			ioc = (BIG_IOCTL_Command_struct *)
			    kmalloc(sizeof(*ioc), GFP_KERNEL);
			if (!ioc) {
				status = -ENOMEM;
				goto cleanup1;
			}
			if (copy_from_user(ioc, argp, sizeof(*ioc))) {
				status = -EFAULT;
				goto cleanup1;
			}
			if ((ioc->buf_size < 1) &&
			    (ioc->Request.Type.Direction != XFER_NONE)) {
				status = -EINVAL;
				goto cleanup1;
			}
			/* Check kmalloc limits  using all SGs */
			if (ioc->malloc_size > MAX_KMALLOC_SIZE) {
				status = -EINVAL;
				goto cleanup1;
			}
			if (ioc->buf_size > ioc->malloc_size * MAXSGENTRIES) {
				status = -EINVAL;
				goto cleanup1;
			}
			buff =
			    kzalloc(MAXSGENTRIES * sizeof(char *), GFP_KERNEL);
			if (!buff) {
				status = -ENOMEM;
				goto cleanup1;
			}
			buff_size = kmalloc(MAXSGENTRIES * sizeof(int),
						   GFP_KERNEL);
			if (!buff_size) {
				status = -ENOMEM;
				goto cleanup1;
			}
			left = ioc->buf_size;
			data_ptr = ioc->buf;
			while (left) {
				sz = (left >
				      ioc->malloc_size) ? ioc->
				    malloc_size : left;
				buff_size[sg_used] = sz;
				buff[sg_used] = kmalloc(sz, GFP_KERNEL);
				if (buff[sg_used] == NULL) {
					status = -ENOMEM;
					goto cleanup1;
				}
				if (ioc->Request.Type.Direction == XFER_WRITE) {
					if (copy_from_user
					    (buff[sg_used], data_ptr, sz)) {
						status = -ENOMEM;
						goto cleanup1;
					}
				} else {
					memset(buff[sg_used], 0, sz);
				}
				left -= sz;
				data_ptr += sz;
				sg_used++;
			}
			if ((c = cmd_alloc(host, 0)) == NULL) {
				status = -ENOMEM;
				goto cleanup1;
			}
			c->cmd_type = CMD_IOCTL_PEND;
			c->Header.ReplyQueue = 0;

			if (ioc->buf_size > 0) {
				c->Header.SGList = sg_used;
				c->Header.SGTotal = sg_used;
			} else {
				c->Header.SGList = 0;
				c->Header.SGTotal = 0;
			}
			c->Header.LUN = ioc->LUN_info;
			c->Header.Tag.lower = c->busaddr;

			c->Request = ioc->Request;
			if (ioc->buf_size > 0) {
				int i;
				for (i = 0; i < sg_used; i++) {
					temp64.val =
					    pci_map_single(host->pdev, buff[i],
						    buff_size[i],
						    PCI_DMA_BIDIRECTIONAL);
					c->SG[i].Addr.lower =
					    temp64.val32.lower;
					c->SG[i].Addr.upper =
					    temp64.val32.upper;
					c->SG[i].Len = buff_size[i];
					c->SG[i].Ext = 0;	/* we are not chaining */
				}
			}
			c->waiting = &wait;
			/* Put the request on the tail of the request queue */
			spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
			addQ(&host->reqQ, c);
			host->Qdepth++;
			start_io(host);
			spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
			wait_for_completion(&wait);
			/* unlock the buffers from DMA */
			for (i = 0; i < sg_used; i++) {
				temp64.val32.lower = c->SG[i].Addr.lower;
				temp64.val32.upper = c->SG[i].Addr.upper;
				pci_unmap_single(host->pdev,
					(dma_addr_t) temp64.val, buff_size[i],
					PCI_DMA_BIDIRECTIONAL);
			}
			/* Copy the error information out */
			ioc->error_info = *(c->err_info);
			if (copy_to_user(argp, ioc, sizeof(*ioc))) {
				cmd_free(host, c, 0);
				status = -EFAULT;
				goto cleanup1;
			}
			if (ioc->Request.Type.Direction == XFER_READ) {
				/* Copy the data out of the buffer we created */
				BYTE __user *ptr = ioc->buf;
				for (i = 0; i < sg_used; i++) {
					if (copy_to_user
					    (ptr, buff[i], buff_size[i])) {
						cmd_free(host, c, 0);
						status = -EFAULT;
						goto cleanup1;
					}
					ptr += buff_size[i];
				}
			}
			cmd_free(host, c, 0);
			status = 0;
		      cleanup1:
			if (buff) {
				for (i = 0; i < sg_used; i++)
					kfree(buff[i]);
				kfree(buff);
			}
			kfree(buff_size);
			kfree(ioc);
			return status;
		}

	/* scsi_cmd_ioctl handles these, below, though some are not */
	/* very meaningful for cciss.  SG_IO is the main one people want. */

	case SG_GET_VERSION_NUM:
	case SG_SET_TIMEOUT:
	case SG_GET_TIMEOUT:
	case SG_GET_RESERVED_SIZE:
	case SG_SET_RESERVED_SIZE:
	case SG_EMULATED_HOST:
	case SG_IO:
	case SCSI_IOCTL_SEND_COMMAND:
		return scsi_cmd_ioctl(filep, disk->queue, disk, cmd, argp);

	/* scsi_cmd_ioctl would normally handle these, below, but */
	/* they aren't a good fit for cciss, as CD-ROMs are */
	/* not supported, and we don't have any bus/target/lun */
	/* which we present to the kernel. */

	case CDROM_SEND_PACKET:
	case CDROMCLOSETRAY:
	case CDROMEJECT:
	case SCSI_IOCTL_GET_IDLUN:
	case SCSI_IOCTL_GET_BUS_NUMBER:
	default:
		return -ENOTTY;
	}
}