diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
new file mode 100644
index 0000000..e020888
--- /dev/null
+++ b/drivers/scsi/scsi_debug.c
@@ -0,0 +1,1976 @@
+/*
+ *  linux/kernel/scsi_debug.c
+ * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
+ *  Copyright (C) 1992  Eric Youngdale
+ *  Simulate a host adapter with 2 disks attached.  Do a lot of checking
+ *  to make sure that we are not getting blocks mixed up, and PANIC if
+ *  anything out of the ordinary is seen.
+ * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ *
+ *  This version is more generic, simulating a variable number of disk
+ *  (or disk like devices) sharing a common amount of RAM
+ *
+ *
+ *  For documentation see http://www.torque.net/sg/sdebug26.html
+ *
+ *   D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
+ *   dpg: work for devfs large number of disks [20010809]
+ *        forked for lk 2.5 series [20011216, 20020101]
+ *        use vmalloc() more inquiry+mode_sense [20020302]
+ *        add timers for delayed responses [20020721]
+ *   Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031]
+ *   Mike Anderson <andmike@us.ibm.com> sysfs work [20021118]
+ *   dpg: change style of boot options to "scsi_debug.num_tgts=2" and
+ *        module options to "modprobe scsi_debug num_tgts=2" [20021221]
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/genhd.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/vmalloc.h>
+#include <linux/moduleparam.h>
+
+#include <linux/blkdev.h>
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include <scsi/scsicam.h>
+
+#include <linux/stat.h>
+
+#ifndef LINUX_VERSION_CODE
+#include <linux/version.h>
+#endif
+
+#include "scsi_logging.h"
+#include "scsi_debug.h"
+
+#define SCSI_DEBUG_VERSION "1.75"
+static const char * scsi_debug_version_date = "20050113";
+
+/* Additional Sense Code (ASC) used */
+#define NO_ADDED_SENSE 0x0
+#define UNRECOVERED_READ_ERR 0x11
+#define INVALID_OPCODE 0x20
+#define ADDR_OUT_OF_RANGE 0x21
+#define INVALID_FIELD_IN_CDB 0x24
+#define POWERON_RESET 0x29
+#define SAVING_PARAMS_UNSUP 0x39
+#define THRESHHOLD_EXCEEDED 0x5d
+
+#define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
+
+/* Default values for driver parameters */
+#define DEF_NUM_HOST   1
+#define DEF_NUM_TGTS   1
+#define DEF_MAX_LUNS   1
+/* With these defaults, this driver will make 1 host with 1 target
+ * (id 0) containing 1 logical unit (lun 0). That is 1 device.
+ */
+#define DEF_DELAY   1
+#define DEF_DEV_SIZE_MB   8
+#define DEF_EVERY_NTH   0
+#define DEF_NUM_PARTS   0
+#define DEF_OPTS   0
+#define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
+#define DEF_PTYPE   0
+#define DEF_D_SENSE   0
+
+/* bit mask values for scsi_debug_opts */
+#define SCSI_DEBUG_OPT_NOISE   1
+#define SCSI_DEBUG_OPT_MEDIUM_ERR   2
+#define SCSI_DEBUG_OPT_TIMEOUT   4
+#define SCSI_DEBUG_OPT_RECOVERED_ERR   8
+/* When "every_nth" > 0 then modulo "every_nth" commands:
+ *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
+ *   - a RECOVERED_ERROR is simulated on successful read and write
+ *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
+ *
+ * When "every_nth" < 0 then after "- every_nth" commands:
+ *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
+ *   - a RECOVERED_ERROR is simulated on successful read and write
+ *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
+ * This will continue until some other action occurs (e.g. the user
+ * writing a new value (other than -1 or 1) to every_nth via sysfs).
+ */
+
+/* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
+ * sector on read commands: */
+#define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
+
+/* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
+ * or "peripheral device" addressing (value 0) */
+#define SAM2_LUN_ADDRESS_METHOD 0
+
+static int scsi_debug_add_host = DEF_NUM_HOST;
+static int scsi_debug_delay = DEF_DELAY;
+static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
+static int scsi_debug_every_nth = DEF_EVERY_NTH;
+static int scsi_debug_max_luns = DEF_MAX_LUNS;
+static int scsi_debug_num_parts = DEF_NUM_PARTS;
+static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
+static int scsi_debug_opts = DEF_OPTS;
+static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
+static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
+static int scsi_debug_dsense = DEF_D_SENSE;
+
+static int scsi_debug_cmnd_count = 0;
+
+#define DEV_READONLY(TGT)      (0)
+#define DEV_REMOVEABLE(TGT)    (0)
+
+static unsigned long sdebug_store_size;	/* in bytes */
+static sector_t sdebug_capacity;	/* in sectors */
+
+/* old BIOS stuff, kernel may get rid of them but some mode sense pages
+   may still need them */
+static int sdebug_heads;		/* heads per disk */
+static int sdebug_cylinders_per;	/* cylinders per surface */
+static int sdebug_sectors_per;		/* sectors per cylinder */
+
+/* default sector size is 512 bytes, 2**9 bytes */
+#define POW2_SECT_SIZE 9
+#define SECT_SIZE (1 << POW2_SECT_SIZE)
+#define SECT_SIZE_PER(TGT) SECT_SIZE
+
+#define SDEBUG_MAX_PARTS 4
+
+#define SDEBUG_SENSE_LEN 32
+
+struct sdebug_dev_info {
+	struct list_head dev_list;
+	unsigned char sense_buff[SDEBUG_SENSE_LEN];	/* weak nexus */
+	unsigned int channel;
+	unsigned int target;
+	unsigned int lun;
+	struct sdebug_host_info *sdbg_host;
+	char reset;
+	char used;
+};
+
+struct sdebug_host_info {
+	struct list_head host_list;
+	struct Scsi_Host *shost;
+	struct device dev;
+	struct list_head dev_info_list;
+};
+
+#define to_sdebug_host(d)	\
+	container_of(d, struct sdebug_host_info, dev)
+
+static LIST_HEAD(sdebug_host_list);
+static DEFINE_SPINLOCK(sdebug_host_list_lock);
+
+typedef void (* done_funct_t) (struct scsi_cmnd *);
+
+struct sdebug_queued_cmd {
+	int in_use;
+	struct timer_list cmnd_timer;
+	done_funct_t done_funct;
+	struct scsi_cmnd * a_cmnd;
+	int scsi_result;
+};
+static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
+
+static Scsi_Host_Template sdebug_driver_template = {
+	.proc_info =		scsi_debug_proc_info,
+	.name =			"SCSI DEBUG",
+	.info =			scsi_debug_info,
+	.slave_alloc =		scsi_debug_slave_alloc,
+	.slave_configure =	scsi_debug_slave_configure,
+	.slave_destroy =	scsi_debug_slave_destroy,
+	.ioctl =		scsi_debug_ioctl,
+	.queuecommand =		scsi_debug_queuecommand,
+	.eh_abort_handler =	scsi_debug_abort,
+	.eh_bus_reset_handler = scsi_debug_bus_reset,
+	.eh_device_reset_handler = scsi_debug_device_reset,
+	.eh_host_reset_handler = scsi_debug_host_reset,
+	.bios_param =		scsi_debug_biosparam,
+	.can_queue =		SCSI_DEBUG_CANQUEUE,
+	.this_id =		7,
+	.sg_tablesize =		64,
+	.cmd_per_lun =		3,
+	.max_sectors =		4096,
+	.unchecked_isa_dma = 	0,
+	.use_clustering = 	DISABLE_CLUSTERING,
+	.module =		THIS_MODULE,
+};
+
+static unsigned char * fake_storep;	/* ramdisk storage */
+
+static int num_aborts = 0;
+static int num_dev_resets = 0;
+static int num_bus_resets = 0;
+static int num_host_resets = 0;
+
+static DEFINE_SPINLOCK(queued_arr_lock);
+static DEFINE_RWLOCK(atomic_rw);
+
+static char sdebug_proc_name[] = "scsi_debug";
+
+static int sdebug_driver_probe(struct device *);
+static int sdebug_driver_remove(struct device *);
+static struct bus_type pseudo_lld_bus;
+
+static struct device_driver sdebug_driverfs_driver = {
+	.name 		= sdebug_proc_name,
+	.bus		= &pseudo_lld_bus,
+	.probe          = sdebug_driver_probe,
+	.remove         = sdebug_driver_remove,
+};
+
+static const int check_condition_result =
+		(DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+/* function declarations */
+static int resp_inquiry(struct scsi_cmnd * SCpnt, int target,
+			struct sdebug_dev_info * devip);
+static int resp_requests(struct scsi_cmnd * SCpnt,
+			 struct sdebug_dev_info * devip);
+static int resp_readcap(struct scsi_cmnd * SCpnt,
+			struct sdebug_dev_info * devip);
+static int resp_mode_sense(struct scsi_cmnd * SCpnt, int target,
+			   struct sdebug_dev_info * devip);
+static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
+		     int num, struct sdebug_dev_info * devip);
+static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
+		      int num, struct sdebug_dev_info * devip);
+static int resp_report_luns(struct scsi_cmnd * SCpnt,
+			    struct sdebug_dev_info * devip);
+static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
+                                int arr_len);
+static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
+                               int max_arr_len);
+static void timer_intr_handler(unsigned long);
+static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev);
+static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
+			    int asc, int asq);
+static int check_reset(struct scsi_cmnd * SCpnt,
+		       struct sdebug_dev_info * devip);
+static int schedule_resp(struct scsi_cmnd * cmnd,
+			 struct sdebug_dev_info * devip,
+			 done_funct_t done, int scsi_result, int delta_jiff);
+static void __init sdebug_build_parts(unsigned char * ramp);
+static void __init init_all_queued(void);
+static void stop_all_queued(void);
+static int stop_queued_cmnd(struct scsi_cmnd * cmnd);
+static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
+                           const char * dev_id_str, int dev_id_str_len);
+static void do_create_driverfs_files(void);
+static void do_remove_driverfs_files(void);
+
+static int sdebug_add_adapter(void);
+static void sdebug_remove_adapter(void);
+static void sdebug_max_tgts_luns(void);
+
+static struct device pseudo_primary;
+static struct bus_type pseudo_lld_bus;
+
+
+static
+int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
+{
+	unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
+	int block, upper_blk, num, k;
+	int errsts = 0;
+	int target = SCpnt->device->id;
+	struct sdebug_dev_info * devip = NULL;
+	int inj_recovered = 0;
+
+	if (done == NULL)
+		return 0;	/* assume mid level reprocessing command */
+
+	if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
+		printk(KERN_INFO "scsi_debug: cmd ");
+		for (k = 0, num = SCpnt->cmd_len; k < num; ++k)
+			printk("%02x ", (int)cmd[k]);
+		printk("\n");
+	}
+        if(target == sdebug_driver_template.this_id) {
+		printk(KERN_INFO "scsi_debug: initiator's id used as "
+		       "target!\n");
+		return schedule_resp(SCpnt, NULL, done,
+				     DID_NO_CONNECT << 16, 0);
+        }
+
+	if (SCpnt->device->lun >= scsi_debug_max_luns)
+		return schedule_resp(SCpnt, NULL, done,
+				     DID_NO_CONNECT << 16, 0);
+	devip = devInfoReg(SCpnt->device);
+	if (NULL == devip)
+		return schedule_resp(SCpnt, NULL, done,
+				     DID_NO_CONNECT << 16, 0);
+
+        if ((scsi_debug_every_nth != 0) &&
+            (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
+                scsi_debug_cmnd_count = 0;
+		if (scsi_debug_every_nth < -1)
+			scsi_debug_every_nth = -1;
+		if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
+			return 0; /* ignore command causing timeout */
+		else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
+			inj_recovered = 1; /* to reads and writes below */
+        }
+
+	switch (*cmd) {
+	case INQUIRY:     /* mandatory, ignore unit attention */
+		errsts = resp_inquiry(SCpnt, target, devip);
+		break;
+	case REQUEST_SENSE:	/* mandatory, ignore unit attention */
+		errsts = resp_requests(SCpnt, devip);
+		break;
+	case REZERO_UNIT:	/* actually this is REWIND for SSC */
+	case START_STOP:
+		errsts = check_reset(SCpnt, devip);
+		break;
+	case ALLOW_MEDIUM_REMOVAL:
+		if ((errsts = check_reset(SCpnt, devip)))
+			break;
+		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+			printk(KERN_INFO "scsi_debug: Medium removal %s\n",
+			        cmd[4] ? "inhibited" : "enabled");
+		break;
+	case SEND_DIAGNOSTIC:     /* mandatory */
+		errsts = check_reset(SCpnt, devip);
+		break;
+	case TEST_UNIT_READY:     /* mandatory */
+		errsts = check_reset(SCpnt, devip);
+		break;
+        case RESERVE:
+		errsts = check_reset(SCpnt, devip);
+                break;
+        case RESERVE_10:
+		errsts = check_reset(SCpnt, devip);
+                break;
+        case RELEASE:
+		errsts = check_reset(SCpnt, devip);
+                break;
+        case RELEASE_10:
+		errsts = check_reset(SCpnt, devip);
+                break;
+	case READ_CAPACITY:
+		errsts = resp_readcap(SCpnt, devip);
+		break;
+	case READ_16:
+	case READ_12:
+	case READ_10:
+	case READ_6:
+		if ((errsts = check_reset(SCpnt, devip)))
+			break;
+		upper_blk = 0;
+		if ((*cmd) == READ_16) {
+			upper_blk = cmd[5] + (cmd[4] << 8) +
+				    (cmd[3] << 16) + (cmd[2] << 24);
+			block = cmd[9] + (cmd[8] << 8) +
+				(cmd[7] << 16) + (cmd[6] << 24);
+			num = cmd[13] + (cmd[12] << 8) +
+				(cmd[11] << 16) + (cmd[10] << 24);
+		} else if ((*cmd) == READ_12) {
+			block = cmd[5] + (cmd[4] << 8) +
+				(cmd[3] << 16) + (cmd[2] << 24);
+			num = cmd[9] + (cmd[8] << 8) +
+				(cmd[7] << 16) + (cmd[6] << 24);
+		} else if ((*cmd) == READ_10) {
+			block = cmd[5] + (cmd[4] << 8) +
+				(cmd[3] << 16) + (cmd[2] << 24);
+			num = cmd[8] + (cmd[7] << 8);
+		} else {
+			block = cmd[3] + (cmd[2] << 8) +
+				((cmd[1] & 0x1f) << 16);
+			num = cmd[4];
+		}
+		errsts = resp_read(SCpnt, upper_blk, block, num, devip);
+		if (inj_recovered && (0 == errsts)) {
+			mk_sense_buffer(devip, RECOVERED_ERROR,
+					THRESHHOLD_EXCEEDED, 0);
+			errsts = check_condition_result;
+		}
+		break;
+	case REPORT_LUNS:	/* mandatory, ignore unit attention */
+		errsts = resp_report_luns(SCpnt, devip);
+		break;
+	case VERIFY:		/* 10 byte SBC-2 command */
+		errsts = check_reset(SCpnt, devip);
+		break;
+	case WRITE_16:
+	case WRITE_12:
+	case WRITE_10:
+	case WRITE_6:
+		if ((errsts = check_reset(SCpnt, devip)))
+			break;
+		upper_blk = 0;
+		if ((*cmd) == WRITE_16) {
+			upper_blk = cmd[5] + (cmd[4] << 8) +
+				    (cmd[3] << 16) + (cmd[2] << 24);
+			block = cmd[9] + (cmd[8] << 8) +
+				(cmd[7] << 16) + (cmd[6] << 24);
+			num = cmd[13] + (cmd[12] << 8) +
+				(cmd[11] << 16) + (cmd[10] << 24);
+		} else if ((*cmd) == WRITE_12) {
+			block = cmd[5] + (cmd[4] << 8) +
+				(cmd[3] << 16) + (cmd[2] << 24);
+			num = cmd[9] + (cmd[8] << 8) +
+				(cmd[7] << 16) + (cmd[6] << 24);
+		} else if ((*cmd) == WRITE_10) {
+			block = cmd[5] + (cmd[4] << 8) +
+				(cmd[3] << 16) + (cmd[2] << 24);
+			num = cmd[8] + (cmd[7] << 8);
+		} else {
+			block = cmd[3] + (cmd[2] << 8) +
+				((cmd[1] & 0x1f) << 16);
+			num = cmd[4];
+		}
+		errsts = resp_write(SCpnt, upper_blk, block, num, devip);
+		if (inj_recovered && (0 == errsts)) {
+			mk_sense_buffer(devip, RECOVERED_ERROR,
+					THRESHHOLD_EXCEEDED, 0);
+			errsts = check_condition_result;
+		}
+		break;
+	case MODE_SENSE:
+	case MODE_SENSE_10:
+		errsts = resp_mode_sense(SCpnt, target, devip);
+		break;
+	case SYNCHRONIZE_CACHE:
+		errsts = check_reset(SCpnt, devip);
+		break;
+	default:
+		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+			printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
+			       "supported\n", *cmd);
+		if ((errsts = check_reset(SCpnt, devip)))
+			break;	/* Unit attention takes precedence */
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
+		errsts = check_condition_result;
+		break;
+	}
+	return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay);
+}
+
+static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
+{
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
+		printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
+	}
+	return -EINVAL;
+	/* return -ENOTTY; // correct return but upsets fdisk */
+}
+
+static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip)
+{
+	if (devip->reset) {
+		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+			printk(KERN_INFO "scsi_debug: Reporting Unit "
+			       "attention: power on reset\n");
+		devip->reset = 0;
+		mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0);
+		return check_condition_result;
+	}
+	return 0;
+}
+
+/* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */
+static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
+				int arr_len)
+{
+	int k, req_len, act_len, len, active;
+	void * kaddr;
+	void * kaddr_off;
+	struct scatterlist * sgpnt;
+
+	if (0 == scp->request_bufflen)
+		return 0;
+	if (NULL == scp->request_buffer)
+		return (DID_ERROR << 16);
+	if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
+	      (scp->sc_data_direction == DMA_FROM_DEVICE)))
+		return (DID_ERROR << 16);
+	if (0 == scp->use_sg) {
+		req_len = scp->request_bufflen;
+		act_len = (req_len < arr_len) ? req_len : arr_len;
+		memcpy(scp->request_buffer, arr, act_len);
+		scp->resid = req_len - act_len;
+		return 0;
+	}
+	sgpnt = (struct scatterlist *)scp->request_buffer;
+	active = 1;
+	for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) {
+		if (active) {
+			kaddr = (unsigned char *)
+				kmap_atomic(sgpnt->page, KM_USER0);
+			if (NULL == kaddr)
+				return (DID_ERROR << 16);
+			kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
+			len = sgpnt->length;
+			if ((req_len + len) > arr_len) {
+				active = 0;
+				len = arr_len - req_len;
+			}
+			memcpy(kaddr_off, arr + req_len, len);
+			kunmap_atomic(kaddr, KM_USER0);
+			act_len += len;
+		}
+		req_len += sgpnt->length;
+	}
+	scp->resid = req_len - act_len;
+	return 0;
+}
+
+/* Returns number of bytes fetched into 'arr' or -1 if error. */
+static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
+			       int max_arr_len)
+{
+	int k, req_len, len, fin;
+	void * kaddr;
+	void * kaddr_off;
+	struct scatterlist * sgpnt;
+
+	if (0 == scp->request_bufflen)
+		return 0;
+	if (NULL == scp->request_buffer)
+		return -1;
+	if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
+	      (scp->sc_data_direction == DMA_TO_DEVICE)))
+		return -1;
+	if (0 == scp->use_sg) {
+		req_len = scp->request_bufflen;
+		len = (req_len < max_arr_len) ? req_len : max_arr_len;
+		memcpy(arr, scp->request_buffer, len);
+		return len;
+	}
+	sgpnt = (struct scatterlist *)scp->request_buffer;
+	for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) {
+		kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0);
+		if (NULL == kaddr)
+			return -1;
+		kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
+		len = sgpnt->length;
+		if ((req_len + len) > max_arr_len) {
+			len = max_arr_len - req_len;
+			fin = 1;
+		}
+		memcpy(arr + req_len, kaddr_off, len);
+		kunmap_atomic(kaddr, KM_USER0);
+		if (fin)
+			return req_len + len;
+		req_len += sgpnt->length;
+	}
+	return req_len;
+}
+
+
+static const char * inq_vendor_id = "Linux   ";
+static const char * inq_product_id = "scsi_debug      ";
+static const char * inq_product_rev = "0004";
+
+static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
+			   const char * dev_id_str, int dev_id_str_len)
+{
+	int num;
+
+	/* Two identification descriptors: */
+	/* T10 vendor identifier field format (faked) */
+	arr[0] = 0x2;	/* ASCII */
+	arr[1] = 0x1;
+	arr[2] = 0x0;
+	memcpy(&arr[4], inq_vendor_id, 8);
+	memcpy(&arr[12], inq_product_id, 16);
+	memcpy(&arr[28], dev_id_str, dev_id_str_len);
+	num = 8 + 16 + dev_id_str_len;
+	arr[3] = num;
+	num += 4;
+	/* NAA IEEE registered identifier (faked) */
+	arr[num] = 0x1;	/* binary */
+	arr[num + 1] = 0x3;
+	arr[num + 2] = 0x0;
+	arr[num + 3] = 0x8;
+	arr[num + 4] = 0x51;	/* ieee company id=0x123456 (faked) */
+	arr[num + 5] = 0x23;
+	arr[num + 6] = 0x45;
+	arr[num + 7] = 0x60;
+	arr[num + 8] = (dev_id_num >> 24);
+	arr[num + 9] = (dev_id_num >> 16) & 0xff;
+	arr[num + 10] = (dev_id_num >> 8) & 0xff;
+	arr[num + 11] = dev_id_num & 0xff;
+	return num + 12;
+}
+
+
+#define SDEBUG_LONG_INQ_SZ 96
+#define SDEBUG_MAX_INQ_ARR_SZ 128
+
+static int resp_inquiry(struct scsi_cmnd * scp, int target,
+			struct sdebug_dev_info * devip)
+{
+	unsigned char pq_pdt;
+	unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ];
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+	int alloc_len;
+
+	alloc_len = (cmd[3] << 8) + cmd[4];
+	memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ);
+	pq_pdt = (scsi_debug_ptype & 0x1f);
+	arr[0] = pq_pdt;
+	if (0x2 & cmd[1]) {  /* CMDDT bit set */
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
+			       	0);
+		return check_condition_result;
+	} else if (0x1 & cmd[1]) {  /* EVPD bit set */
+		int dev_id_num, len;
+		char dev_id_str[6];
+		
+		dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
+			     (devip->target * 1000) + devip->lun;
+		len = scnprintf(dev_id_str, 6, "%d", dev_id_num);
+		if (0 == cmd[2]) { /* supported vital product data pages */
+			arr[3] = 3;
+			arr[4] = 0x0; /* this page */
+			arr[5] = 0x80; /* unit serial number */
+			arr[6] = 0x83; /* device identification */
+		} else if (0x80 == cmd[2]) { /* unit serial number */
+			arr[1] = 0x80;
+			arr[3] = len;
+			memcpy(&arr[4], dev_id_str, len);
+		} else if (0x83 == cmd[2]) { /* device identification */
+			arr[1] = 0x83;
+			arr[3] = inquiry_evpd_83(&arr[4], dev_id_num,
+						 dev_id_str, len);
+		} else {
+			/* Illegal request, invalid field in cdb */
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_FIELD_IN_CDB, 0);
+			return check_condition_result;
+		}
+		return fill_from_dev_buffer(scp, arr,
+			    min(alloc_len, SDEBUG_MAX_INQ_ARR_SZ));
+	}
+	/* drops through here for a standard inquiry */
+	arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0;	/* Removable disk */
+	arr[2] = scsi_debug_scsi_level;
+	arr[3] = 2;    /* response_data_format==2 */
+	arr[4] = SDEBUG_LONG_INQ_SZ - 5;
+	arr[6] = 0x1; /* claim: ADDR16 */
+	/* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
+	arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */
+	memcpy(&arr[8], inq_vendor_id, 8);
+	memcpy(&arr[16], inq_product_id, 16);
+	memcpy(&arr[32], inq_product_rev, 4);
+	/* version descriptors (2 bytes each) follow */
+	arr[58] = 0x0; arr[59] = 0x40; /* SAM-2 */
+	arr[60] = 0x3; arr[61] = 0x0;  /* SPC-3 */
+	if (scsi_debug_ptype == 0) {
+		arr[62] = 0x1; arr[63] = 0x80; /* SBC */
+	} else if (scsi_debug_ptype == 1) {
+		arr[62] = 0x2; arr[63] = 0x00; /* SSC */
+	}
+	return fill_from_dev_buffer(scp, arr,
+			    min(alloc_len, SDEBUG_LONG_INQ_SZ));
+}
+
+static int resp_requests(struct scsi_cmnd * scp,
+			 struct sdebug_dev_info * devip)
+{
+	unsigned char * sbuff;
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+	unsigned char arr[SDEBUG_SENSE_LEN];
+	int len = 18;
+
+	memset(arr, 0, SDEBUG_SENSE_LEN);
+	if (devip->reset == 1)
+		mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0);
+	sbuff = devip->sense_buff;
+	if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
+		/* DESC bit set and sense_buff in fixed format */
+		arr[0] = 0x72;
+		arr[1] = sbuff[2];     /* sense key */
+		arr[2] = sbuff[12];    /* asc */
+		arr[3] = sbuff[13];    /* ascq */
+		len = 8;
+	} else
+		memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
+	mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0);
+	return fill_from_dev_buffer(scp, arr, len);
+}
+
+#define SDEBUG_READCAP_ARR_SZ 8
+static int resp_readcap(struct scsi_cmnd * scp,
+			struct sdebug_dev_info * devip)
+{
+	unsigned char arr[SDEBUG_READCAP_ARR_SZ];
+	unsigned long capac;
+	int errsts;
+
+	if ((errsts = check_reset(scp, devip)))
+		return errsts;
+	memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
+	capac = (unsigned long)sdebug_capacity - 1;
+	arr[0] = (capac >> 24);
+	arr[1] = (capac >> 16) & 0xff;
+	arr[2] = (capac >> 8) & 0xff;
+	arr[3] = capac & 0xff;
+	arr[6] = (SECT_SIZE_PER(target) >> 8) & 0xff;
+	arr[7] = SECT_SIZE_PER(target) & 0xff;
+	return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
+}
+
+/* <<Following mode page info copied from ST318451LW>> */
+
+static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
+{	/* Read-Write Error Recovery page for mode_sense */
+	unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
+					5, 0, 0xff, 0xff};
+
+	memcpy(p, err_recov_pg, sizeof(err_recov_pg));
+	if (1 == pcontrol)
+		memset(p + 2, 0, sizeof(err_recov_pg) - 2);
+	return sizeof(err_recov_pg);
+}
+
+static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
+{ 	/* Disconnect-Reconnect page for mode_sense */
+	unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
+					 0, 0, 0, 0, 0, 0, 0, 0};
+
+	memcpy(p, disconnect_pg, sizeof(disconnect_pg));
+	if (1 == pcontrol)
+		memset(p + 2, 0, sizeof(disconnect_pg) - 2);
+	return sizeof(disconnect_pg);
+}
+
+static int resp_format_pg(unsigned char * p, int pcontrol, int target)
+{       /* Format device page for mode_sense */
+        unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
+                                     0, 0, 0, 0, 0, 0, 0, 0,
+                                     0, 0, 0, 0, 0x40, 0, 0, 0};
+
+        memcpy(p, format_pg, sizeof(format_pg));
+        p[10] = (sdebug_sectors_per >> 8) & 0xff;
+        p[11] = sdebug_sectors_per & 0xff;
+        p[12] = (SECT_SIZE >> 8) & 0xff;
+        p[13] = SECT_SIZE & 0xff;
+        if (DEV_REMOVEABLE(target))
+                p[20] |= 0x20; /* should agree with INQUIRY */
+        if (1 == pcontrol)
+                memset(p + 2, 0, sizeof(format_pg) - 2);
+        return sizeof(format_pg);
+}
+
+static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
+{ 	/* Caching page for mode_sense */
+	unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
+		0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
+
+	memcpy(p, caching_pg, sizeof(caching_pg));
+	if (1 == pcontrol)
+		memset(p + 2, 0, sizeof(caching_pg) - 2);
+	return sizeof(caching_pg);
+}
+
+static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
+{ 	/* Control mode page for mode_sense */
+	unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
+				     0, 0, 0x2, 0x4b};
+
+	if (scsi_debug_dsense)
+		ctrl_m_pg[2] |= 0x4;
+	memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
+	if (1 == pcontrol)
+		memset(p + 2, 0, sizeof(ctrl_m_pg) - 2);
+	return sizeof(ctrl_m_pg);
+}
+
+static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
+{	/* Informational Exceptions control mode page for mode_sense */
+	unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
+				    0, 0, 0x0, 0x0};
+	memcpy(p, iec_m_pg, sizeof(iec_m_pg));
+	if (1 == pcontrol)
+		memset(p + 2, 0, sizeof(iec_m_pg) - 2);
+	return sizeof(iec_m_pg);
+}
+
+#define SDEBUG_MAX_MSENSE_SZ 256
+
+static int resp_mode_sense(struct scsi_cmnd * scp, int target,
+			   struct sdebug_dev_info * devip)
+{
+	unsigned char dbd;
+	int pcontrol, pcode, subpcode;
+	unsigned char dev_spec;
+	int alloc_len, msense_6, offset, len, errsts;
+	unsigned char * ap;
+	unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+
+	if ((errsts = check_reset(scp, devip)))
+		return errsts;
+	dbd = cmd[1] & 0x8;
+	pcontrol = (cmd[2] & 0xc0) >> 6;
+	pcode = cmd[2] & 0x3f;
+	subpcode = cmd[3];
+	msense_6 = (MODE_SENSE == cmd[0]);
+	alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
+	memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
+	if (0x3 == pcontrol) {  /* Saving values not supported */
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
+			       	0);
+		return check_condition_result;
+	}
+	dev_spec = DEV_READONLY(target) ? 0x80 : 0x0;
+	if (msense_6) {
+		arr[2] = dev_spec;
+		offset = 4;
+	} else {
+		arr[3] = dev_spec;
+		offset = 8;
+	}
+	ap = arr + offset;
+
+	if (0 != subpcode) { /* TODO: Control Extension page */
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
+			       	0);
+		return check_condition_result;
+	}
+	switch (pcode) {
+	case 0x1:	/* Read-Write error recovery page, direct access */
+		len = resp_err_recov_pg(ap, pcontrol, target);
+		offset += len;
+		break;
+	case 0x2:	/* Disconnect-Reconnect page, all devices */
+		len = resp_disconnect_pg(ap, pcontrol, target);
+		offset += len;
+		break;
+        case 0x3:       /* Format device page, direct access */
+                len = resp_format_pg(ap, pcontrol, target);
+                offset += len;
+                break;
+	case 0x8:	/* Caching page, direct access */
+		len = resp_caching_pg(ap, pcontrol, target);
+		offset += len;
+		break;
+	case 0xa:	/* Control Mode page, all devices */
+		len = resp_ctrl_m_pg(ap, pcontrol, target);
+		offset += len;
+		break;
+	case 0x1c:	/* Informational Exceptions Mode page, all devices */
+		len = resp_iec_m_pg(ap, pcontrol, target);
+		offset += len;
+		break;
+	case 0x3f:	/* Read all Mode pages */
+		len = resp_err_recov_pg(ap, pcontrol, target);
+		len += resp_disconnect_pg(ap + len, pcontrol, target);
+		len += resp_format_pg(ap + len, pcontrol, target);
+		len += resp_caching_pg(ap + len, pcontrol, target);
+		len += resp_ctrl_m_pg(ap + len, pcontrol, target);
+		len += resp_iec_m_pg(ap + len, pcontrol, target);
+		offset += len;
+		break;
+	default:
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
+			       	0);
+		return check_condition_result;
+	}
+	if (msense_6)
+		arr[0] = offset - 1;
+	else {
+		arr[0] = ((offset - 2) >> 8) & 0xff;
+		arr[1] = (offset - 2) & 0xff;
+	}
+	return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
+}
+
+static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
+		     int num, struct sdebug_dev_info * devip)
+{
+	unsigned long iflags;
+	int ret;
+
+	if (upper_blk || (block + num > sdebug_capacity)) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
+				0);
+		return check_condition_result;
+	}
+	if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
+	    (block <= OPT_MEDIUM_ERR_ADDR) &&
+	    ((block + num) > OPT_MEDIUM_ERR_ADDR)) {
+		mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR,
+				0);
+		/* claim unrecoverable read error */
+		return check_condition_result;
+	}
+	read_lock_irqsave(&atomic_rw, iflags);
+	ret = fill_from_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE),
+			   	   num * SECT_SIZE);
+	read_unlock_irqrestore(&atomic_rw, iflags);
+	return ret;
+}
+
+static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
+		      int num, struct sdebug_dev_info * devip)
+{
+	unsigned long iflags;
+	int res;
+
+	if (upper_blk || (block + num > sdebug_capacity)) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
+			       	0);
+		return check_condition_result;
+	}
+
+	write_lock_irqsave(&atomic_rw, iflags);
+	res = fetch_to_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE),
+			   	  num * SECT_SIZE);
+	write_unlock_irqrestore(&atomic_rw, iflags);
+	if (-1 == res)
+		return (DID_ERROR << 16);
+	else if ((res < (num * SECT_SIZE)) &&
+		 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
+		printk(KERN_INFO "scsi_debug: write: cdb indicated=%d, "
+		       " IO sent=%d bytes\n", num * SECT_SIZE, res);
+	return 0;
+}
+
+#define SDEBUG_RLUN_ARR_SZ 128
+
+static int resp_report_luns(struct scsi_cmnd * scp,
+			    struct sdebug_dev_info * devip)
+{
+	unsigned int alloc_len;
+	int lun_cnt, i, upper;
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+	int select_report = (int)cmd[2];
+	struct scsi_lun *one_lun;
+	unsigned char arr[SDEBUG_RLUN_ARR_SZ];
+
+	alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
+	if ((alloc_len < 16) || (select_report > 2)) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
+			       	0);
+		return check_condition_result;
+	}
+	/* can produce response with up to 16k luns (lun 0 to lun 16383) */
+	memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
+	lun_cnt = scsi_debug_max_luns;
+	arr[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff;
+	arr[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff;
+	lun_cnt = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
+			    sizeof(struct scsi_lun)), lun_cnt);
+	one_lun = (struct scsi_lun *) &arr[8];
+	for (i = 0; i < lun_cnt; i++) {
+		upper = (i >> 8) & 0x3f;
+		if (upper)
+			one_lun[i].scsi_lun[0] =
+			    (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
+		one_lun[i].scsi_lun[1] = i & 0xff;
+	}
+	return fill_from_dev_buffer(scp, arr,
+				    min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
+}
+
+/* When timer goes off this function is called. */
+static void timer_intr_handler(unsigned long indx)
+{
+	struct sdebug_queued_cmd * sqcp;
+	unsigned long iflags;
+
+	if (indx >= SCSI_DEBUG_CANQUEUE) {
+		printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
+		       "large\n");
+		return;
+	}
+	spin_lock_irqsave(&queued_arr_lock, iflags);
+	sqcp = &queued_arr[(int)indx];
+	if (! sqcp->in_use) {
+		printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
+		       "interrupt\n");
+		spin_unlock_irqrestore(&queued_arr_lock, iflags);
+		return;
+	}
+	sqcp->in_use = 0;
+	if (sqcp->done_funct) {
+		sqcp->a_cmnd->result = sqcp->scsi_result;
+		sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
+	}
+	sqcp->done_funct = NULL;
+	spin_unlock_irqrestore(&queued_arr_lock, iflags);
+}
+
+static int scsi_debug_slave_alloc(struct scsi_device * sdp)
+{
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
+		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
+	return 0;
+}
+
+static int scsi_debug_slave_configure(struct scsi_device * sdp)
+{
+	struct sdebug_dev_info * devip;
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
+		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
+	if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
+		sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
+	devip = devInfoReg(sdp);
+	sdp->hostdata = devip;
+	if (sdp->host->cmd_per_lun)
+		scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
+					sdp->host->cmd_per_lun);
+	return 0;
+}
+
+static void scsi_debug_slave_destroy(struct scsi_device * sdp)
+{
+	struct sdebug_dev_info * devip =
+				(struct sdebug_dev_info *)sdp->hostdata;
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
+		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
+	if (devip) {
+		/* make this slot avaliable for re-use */
+		devip->used = 0;
+		sdp->hostdata = NULL;
+	}
+}
+
+static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
+{
+	struct sdebug_host_info * sdbg_host;
+	struct sdebug_dev_info * open_devip = NULL;
+	struct sdebug_dev_info * devip =
+			(struct sdebug_dev_info *)sdev->hostdata;
+
+	if (devip)
+		return devip;
+	sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata;
+        if(! sdbg_host) {
+                printk(KERN_ERR "Host info NULL\n");
+		return NULL;
+        }
+	list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
+		if ((devip->used) && (devip->channel == sdev->channel) &&
+                    (devip->target == sdev->id) &&
+                    (devip->lun == sdev->lun))
+                        return devip;
+		else {
+			if ((!devip->used) && (!open_devip))
+				open_devip = devip;
+		}
+	}
+	if (NULL == open_devip) { /* try and make a new one */
+		open_devip = kmalloc(sizeof(*open_devip),GFP_KERNEL);
+		if (NULL == open_devip) {
+			printk(KERN_ERR "%s: out of memory at line %d\n",
+				__FUNCTION__, __LINE__);
+			return NULL;
+		}
+		memset(open_devip, 0, sizeof(*open_devip));
+		open_devip->sdbg_host = sdbg_host;
+		list_add_tail(&open_devip->dev_list,
+		&sdbg_host->dev_info_list);
+	}
+        if (open_devip) {
+		open_devip->channel = sdev->channel;
+		open_devip->target = sdev->id;
+		open_devip->lun = sdev->lun;
+		open_devip->sdbg_host = sdbg_host;
+		open_devip->reset = 1;
+		open_devip->used = 1;
+		memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
+		if (scsi_debug_dsense)
+			open_devip->sense_buff[0] = 0x72;
+		else {
+			open_devip->sense_buff[0] = 0x70;
+			open_devip->sense_buff[7] = 0xa;
+		}
+		return open_devip;
+        }
+        return NULL;
+}
+
+static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
+			    int asc, int asq)
+{
+	unsigned char * sbuff;
+
+	sbuff = devip->sense_buff;
+	memset(sbuff, 0, SDEBUG_SENSE_LEN);
+	if (scsi_debug_dsense) {
+		sbuff[0] = 0x72;  /* descriptor, current */
+		sbuff[1] = key;
+		sbuff[2] = asc;
+		sbuff[3] = asq;
+	} else {
+		sbuff[0] = 0x70;  /* fixed, current */
+		sbuff[2] = key;
+		sbuff[7] = 0xa;	  /* implies 18 byte sense buffer */
+		sbuff[12] = asc;
+		sbuff[13] = asq;
+	}
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug:    [sense_key,asc,ascq]: "
+		      "[0x%x,0x%x,0x%x]\n", key, asc, asq);
+}
+
+static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
+{
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: abort\n");
+	++num_aborts;
+	stop_queued_cmnd(SCpnt);
+	return SUCCESS;
+}
+
+static int scsi_debug_biosparam(struct scsi_device *sdev,
+		struct block_device * bdev, sector_t capacity, int *info)
+{
+	int res;
+	unsigned char *buf;
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: biosparam\n");
+	buf = scsi_bios_ptable(bdev);
+	if (buf) {
+		res = scsi_partsize(buf, capacity,
+				    &info[2], &info[0], &info[1]);
+		kfree(buf);
+		if (! res)
+			return res;
+	}
+	info[0] = sdebug_heads;
+	info[1] = sdebug_sectors_per;
+	info[2] = sdebug_cylinders_per;
+	return 0;
+}
+
+static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
+{
+	struct sdebug_dev_info * devip;
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: device_reset\n");
+	++num_dev_resets;
+	if (SCpnt) {
+		devip = devInfoReg(SCpnt->device);
+		if (devip)
+			devip->reset = 1;
+	}
+	return SUCCESS;
+}
+
+static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
+{
+	struct sdebug_host_info *sdbg_host;
+        struct sdebug_dev_info * dev_info;
+        struct scsi_device * sdp;
+        struct Scsi_Host * hp;
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: bus_reset\n");
+	++num_bus_resets;
+	if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
+		sdbg_host = *(struct sdebug_host_info **) hp->hostdata;
+		if (sdbg_host) {
+			list_for_each_entry(dev_info,
+                                            &sdbg_host->dev_info_list,
+                                            dev_list)
+				dev_info->reset = 1;
+		}
+	}
+	return SUCCESS;
+}
+
+static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
+{
+	struct sdebug_host_info * sdbg_host;
+        struct sdebug_dev_info * dev_info;
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: host_reset\n");
+	++num_host_resets;
+        spin_lock(&sdebug_host_list_lock);
+        list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
+                list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
+                                    dev_list)
+                        dev_info->reset = 1;
+        }
+        spin_unlock(&sdebug_host_list_lock);
+	stop_all_queued();
+	return SUCCESS;
+}
+
+/* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
+static int stop_queued_cmnd(struct scsi_cmnd * cmnd)
+{
+	unsigned long iflags;
+	int k;
+	struct sdebug_queued_cmd * sqcp;
+
+	spin_lock_irqsave(&queued_arr_lock, iflags);
+	for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
+		sqcp = &queued_arr[k];
+		if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
+			del_timer_sync(&sqcp->cmnd_timer);
+			sqcp->in_use = 0;
+			sqcp->a_cmnd = NULL;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&queued_arr_lock, iflags);
+	return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
+}
+
+/* Deletes (stops) timers of all queued commands */
+static void stop_all_queued(void)
+{
+	unsigned long iflags;
+	int k;
+	struct sdebug_queued_cmd * sqcp;
+
+	spin_lock_irqsave(&queued_arr_lock, iflags);
+	for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
+		sqcp = &queued_arr[k];
+		if (sqcp->in_use && sqcp->a_cmnd) {
+			del_timer_sync(&sqcp->cmnd_timer);
+			sqcp->in_use = 0;
+			sqcp->a_cmnd = NULL;
+		}
+	}
+	spin_unlock_irqrestore(&queued_arr_lock, iflags);
+}
+
+/* Initializes timers in queued array */
+static void __init init_all_queued(void)
+{
+	unsigned long iflags;
+	int k;
+	struct sdebug_queued_cmd * sqcp;
+
+	spin_lock_irqsave(&queued_arr_lock, iflags);
+	for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
+		sqcp = &queued_arr[k];
+		init_timer(&sqcp->cmnd_timer);
+		sqcp->in_use = 0;
+		sqcp->a_cmnd = NULL;
+	}
+	spin_unlock_irqrestore(&queued_arr_lock, iflags);
+}
+
+static void __init sdebug_build_parts(unsigned char * ramp)
+{
+	struct partition * pp;
+	int starts[SDEBUG_MAX_PARTS + 2];
+	int sectors_per_part, num_sectors, k;
+	int heads_by_sects, start_sec, end_sec;
+
+	/* assume partition table already zeroed */
+	if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576))
+		return;
+	if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
+		scsi_debug_num_parts = SDEBUG_MAX_PARTS;
+		printk(KERN_WARNING "scsi_debug:build_parts: reducing "
+				    "partitions to %d\n", SDEBUG_MAX_PARTS);
+	}
+	num_sectors = (int)(sdebug_store_size / SECT_SIZE);
+	sectors_per_part = (num_sectors - sdebug_sectors_per)
+			   / scsi_debug_num_parts;
+	heads_by_sects = sdebug_heads * sdebug_sectors_per;
+        starts[0] = sdebug_sectors_per;
+	for (k = 1; k < scsi_debug_num_parts; ++k)
+		starts[k] = ((k * sectors_per_part) / heads_by_sects)
+			    * heads_by_sects;
+	starts[scsi_debug_num_parts] = num_sectors;
+	starts[scsi_debug_num_parts + 1] = 0;
+
+	ramp[510] = 0x55;	/* magic partition markings */
+	ramp[511] = 0xAA;
+	pp = (struct partition *)(ramp + 0x1be);
+	for (k = 0; starts[k + 1]; ++k, ++pp) {
+		start_sec = starts[k];
+		end_sec = starts[k + 1] - 1;
+		pp->boot_ind = 0;
+
+		pp->cyl = start_sec / heads_by_sects;
+		pp->head = (start_sec - (pp->cyl * heads_by_sects))
+			   / sdebug_sectors_per;
+		pp->sector = (start_sec % sdebug_sectors_per) + 1;
+
+		pp->end_cyl = end_sec / heads_by_sects;
+		pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
+			       / sdebug_sectors_per;
+		pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
+
+		pp->start_sect = start_sec;
+		pp->nr_sects = end_sec - start_sec + 1;
+		pp->sys_ind = 0x83;	/* plain Linux partition */
+	}
+}
+
+static int schedule_resp(struct scsi_cmnd * cmnd,
+			 struct sdebug_dev_info * devip,
+			 done_funct_t done, int scsi_result, int delta_jiff)
+{
+	if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
+		if (scsi_result) {
+			struct scsi_device * sdp = cmnd->device;
+
+			printk(KERN_INFO "scsi_debug:    <%u %u %u %u> "
+			       "non-zero result=0x%x\n", sdp->host->host_no,
+			       sdp->channel, sdp->id, sdp->lun, scsi_result);
+		}
+	}
+	if (cmnd && devip) {
+		/* simulate autosense by this driver */
+		if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
+			memcpy(cmnd->sense_buffer, devip->sense_buff,
+			       (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
+			       SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
+	}
+	if (delta_jiff <= 0) {
+		if (cmnd)
+			cmnd->result = scsi_result;
+		if (done)
+			done(cmnd);
+		return 0;
+	} else {
+		unsigned long iflags;
+		int k;
+		struct sdebug_queued_cmd * sqcp = NULL;
+
+		spin_lock_irqsave(&queued_arr_lock, iflags);
+		for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
+			sqcp = &queued_arr[k];
+			if (! sqcp->in_use)
+				break;
+		}
+		if (k >= SCSI_DEBUG_CANQUEUE) {
+			spin_unlock_irqrestore(&queued_arr_lock, iflags);
+			printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
+			return 1;	/* report busy to mid level */
+		}
+		sqcp->in_use = 1;
+		sqcp->a_cmnd = cmnd;
+		sqcp->scsi_result = scsi_result;
+		sqcp->done_funct = done;
+		sqcp->cmnd_timer.function = timer_intr_handler;
+		sqcp->cmnd_timer.data = k;
+		sqcp->cmnd_timer.expires = jiffies + delta_jiff;
+		add_timer(&sqcp->cmnd_timer);
+		spin_unlock_irqrestore(&queued_arr_lock, iflags);
+		if (cmnd)
+			cmnd->result = 0;
+		return 0;
+	}
+}
+
+/* Set 'perm' (4th argument) to 0 to disable module_param's definition
+ * of sysfs parameters (which module_param doesn't yet support).
+ * Sysfs parameters defined explicitly below.
+ */
+module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */
+module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */
+module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0);
+module_param_named(dsense, scsi_debug_dsense, int, 0);
+module_param_named(every_nth, scsi_debug_every_nth, int, 0);
+module_param_named(max_luns, scsi_debug_max_luns, int, 0);
+module_param_named(num_parts, scsi_debug_num_parts, int, 0);
+module_param_named(num_tgts, scsi_debug_num_tgts, int, 0);
+module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */
+module_param_named(ptype, scsi_debug_ptype, int, 0);
+module_param_named(scsi_level, scsi_debug_scsi_level, int, 0);
+
+MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
+MODULE_DESCRIPTION("SCSI debug adapter driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(SCSI_DEBUG_VERSION);
+
+MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
+MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
+MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs");
+MODULE_PARM_DESC(dsense, "use descriptor sense format(def: fixed)");
+MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)");
+MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate");
+MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
+MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate");
+MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->...");
+MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
+MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
+
+
+static char sdebug_info[256];
+
+static const char * scsi_debug_info(struct Scsi_Host * shp)
+{
+	sprintf(sdebug_info, "scsi_debug, version %s [%s], "
+		"dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
+		scsi_debug_version_date, scsi_debug_dev_size_mb,
+		scsi_debug_opts);
+	return sdebug_info;
+}
+
+/* scsi_debug_proc_info
+ * Used if the driver currently has no own support for /proc/scsi
+ */
+static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
+				int length, int inout)
+{
+	int len, pos, begin;
+	int orig_length;
+
+	orig_length = length;
+
+	if (inout == 1) {
+		char arr[16];
+		int minLen = length > 15 ? 15 : length;
+
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+			return -EACCES;
+		memcpy(arr, buffer, minLen);
+		arr[minLen] = '\0';
+		if (1 != sscanf(arr, "%d", &pos))
+			return -EINVAL;
+		scsi_debug_opts = pos;
+		if (scsi_debug_every_nth != 0)
+                        scsi_debug_cmnd_count = 0;
+		return length;
+	}
+	begin = 0;
+	pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
+	    "%s [%s]\n"
+	    "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
+	    "every_nth=%d(curr:%d)\n"
+	    "delay=%d, max_luns=%d, scsi_level=%d\n"
+	    "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
+	    "number of aborts=%d, device_reset=%d, bus_resets=%d, "
+	    "host_resets=%d\n",
+	    SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
+	    scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
+	    scsi_debug_cmnd_count, scsi_debug_delay,
+	    scsi_debug_max_luns, scsi_debug_scsi_level,
+	    SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per,
+	    num_aborts, num_dev_resets, num_bus_resets, num_host_resets);
+	if (pos < offset) {
+		len = 0;
+		begin = pos;
+	}
+	*start = buffer + (offset - begin);	/* Start of wanted data */
+	len -= (offset - begin);
+	if (len > length)
+		len = length;
+	return len;
+}
+
+static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
+}
+
+static ssize_t sdebug_delay_store(struct device_driver * ddp,
+				  const char * buf, size_t count)
+{
+        int delay;
+	char work[20];
+
+        if (1 == sscanf(buf, "%10s", work)) {
+		if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
+			scsi_debug_delay = delay;
+			return count;
+		}
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
+	    sdebug_delay_store);
+
+static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
+}
+
+static ssize_t sdebug_opts_store(struct device_driver * ddp,
+				 const char * buf, size_t count)
+{
+        int opts;
+	char work[20];
+
+        if (1 == sscanf(buf, "%10s", work)) {
+		if (0 == strnicmp(work,"0x", 2)) {
+			if (1 == sscanf(&work[2], "%x", &opts))
+				goto opts_done;
+		} else {
+			if (1 == sscanf(work, "%d", &opts))
+				goto opts_done;
+		}
+	}
+	return -EINVAL;
+opts_done:
+	scsi_debug_opts = opts;
+	scsi_debug_cmnd_count = 0;
+	return count;
+}
+DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
+	    sdebug_opts_store);
+
+static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
+}
+static ssize_t sdebug_ptype_store(struct device_driver * ddp,
+				  const char * buf, size_t count)
+{
+        int n;
+
+	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
+		scsi_debug_ptype = n;
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
+
+static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
+}
+static ssize_t sdebug_dsense_store(struct device_driver * ddp,
+				  const char * buf, size_t count)
+{
+        int n;
+
+	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
+		scsi_debug_dsense = n;
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
+	    sdebug_dsense_store);
+
+static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
+}
+static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
+				     const char * buf, size_t count)
+{
+        int n;
+
+	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
+		scsi_debug_num_tgts = n;
+		sdebug_max_tgts_luns();
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
+	    sdebug_num_tgts_store);
+
+static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
+}
+DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
+
+static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
+}
+DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
+
+static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
+}
+static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
+				      const char * buf, size_t count)
+{
+        int nth;
+
+	if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
+		scsi_debug_every_nth = nth;
+		scsi_debug_cmnd_count = 0;
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
+	    sdebug_every_nth_store);
+
+static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
+}
+static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
+				     const char * buf, size_t count)
+{
+        int n;
+
+	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
+		scsi_debug_max_luns = n;
+		sdebug_max_tgts_luns();
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
+	    sdebug_max_luns_store);
+
+static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
+}
+DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
+
+static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
+}
+
+static ssize_t sdebug_add_host_store(struct device_driver * ddp,
+				     const char * buf, size_t count)
+{
+        int delta_hosts;
+	char work[20];
+
+        if (1 != sscanf(buf, "%10s", work))
+		return -EINVAL;
+	{	/* temporary hack around sscanf() problem with -ve nums */
+		int neg = 0;
+
+		if ('-' == *work)
+			neg = 1;
+		if (1 != sscanf(work + neg, "%d", &delta_hosts))
+			return -EINVAL;
+		if (neg)
+			delta_hosts = -delta_hosts;
+	}
+	if (delta_hosts > 0) {
+		do {
+			sdebug_add_adapter();
+		} while (--delta_hosts);
+	} else if (delta_hosts < 0) {
+		do {
+			sdebug_remove_adapter();
+		} while (++delta_hosts);
+	}
+	return count;
+}
+DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show, 
+	    sdebug_add_host_store);
+
+static void do_create_driverfs_files(void)
+{
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
+	driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
+}
+
+static void do_remove_driverfs_files(void)
+{
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
+}
+
+static int __init scsi_debug_init(void)
+{
+	unsigned long sz;
+	int host_to_add;
+	int k;
+
+	if (scsi_debug_dev_size_mb < 1)
+		scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
+	sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576;
+	sdebug_capacity = sdebug_store_size / SECT_SIZE;
+
+	/* play around with geometry, don't waste too much on track 0 */
+	sdebug_heads = 8;
+	sdebug_sectors_per = 32;
+	if (scsi_debug_dev_size_mb >= 16)
+		sdebug_heads = 32;
+	else if (scsi_debug_dev_size_mb >= 256)
+		sdebug_heads = 64;
+	sdebug_cylinders_per = (unsigned long)sdebug_capacity /
+			       (sdebug_sectors_per * sdebug_heads);
+	if (sdebug_cylinders_per >= 1024) {
+		/* other LLDs do this; implies >= 1GB ram disk ... */
+		sdebug_heads = 255;
+		sdebug_sectors_per = 63;
+		sdebug_cylinders_per = (unsigned long)sdebug_capacity /
+			       (sdebug_sectors_per * sdebug_heads);
+	}
+
+	sz = sdebug_store_size;
+	fake_storep = vmalloc(sz);
+	if (NULL == fake_storep) {
+		printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
+		return -ENOMEM;
+	}
+	memset(fake_storep, 0, sz);
+	if (scsi_debug_num_parts > 0)
+		sdebug_build_parts(fake_storep);
+
+	init_all_queued();
+
+	device_register(&pseudo_primary);
+	bus_register(&pseudo_lld_bus);
+	driver_register(&sdebug_driverfs_driver);
+	do_create_driverfs_files();
+
+	sdebug_driver_template.proc_name = (char *)sdebug_proc_name;
+
+	host_to_add = scsi_debug_add_host;
+        scsi_debug_add_host = 0;
+
+        for (k = 0; k < host_to_add; k++) {
+                if (sdebug_add_adapter()) {
+                        printk(KERN_ERR "scsi_debug_init: "
+                               "sdebug_add_adapter failed k=%d\n", k);
+                        break;
+                }
+        }
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
+		printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
+		       scsi_debug_add_host);
+	}
+	return 0;
+}
+
+static void __exit scsi_debug_exit(void)
+{
+	int k = scsi_debug_add_host;
+
+	stop_all_queued();
+	for (; k; k--)
+		sdebug_remove_adapter();
+	do_remove_driverfs_files();
+	driver_unregister(&sdebug_driverfs_driver);
+	bus_unregister(&pseudo_lld_bus);
+	device_unregister(&pseudo_primary);
+
+	vfree(fake_storep);
+}
+
+device_initcall(scsi_debug_init);
+module_exit(scsi_debug_exit);
+
+void pseudo_0_release(struct device * dev)
+{
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
+}
+
+static struct device pseudo_primary = {
+	.bus_id		= "pseudo_0",
+	.release	= pseudo_0_release,
+};
+
+static int pseudo_lld_bus_match(struct device *dev,
+                          struct device_driver *dev_driver)
+{
+        return 1;
+}
+
+static struct bus_type pseudo_lld_bus = {
+        .name = "pseudo",
+        .match = pseudo_lld_bus_match,
+};
+
+static void sdebug_release_adapter(struct device * dev)
+{
+        struct sdebug_host_info *sdbg_host;
+
+	sdbg_host = to_sdebug_host(dev);
+        kfree(sdbg_host);
+}
+
+static int sdebug_add_adapter(void)
+{
+	int k, devs_per_host;
+        int error = 0;
+        struct sdebug_host_info *sdbg_host;
+        struct sdebug_dev_info *sdbg_devinfo;
+        struct list_head *lh, *lh_sf;
+
+        sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL);
+
+        if (NULL == sdbg_host) {
+                printk(KERN_ERR "%s: out of memory at line %d\n",
+                       __FUNCTION__, __LINE__);
+                return -ENOMEM;
+        }
+
+        memset(sdbg_host, 0, sizeof(*sdbg_host));
+        INIT_LIST_HEAD(&sdbg_host->dev_info_list);
+
+	devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
+        for (k = 0; k < devs_per_host; k++) {
+                sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL);
+                if (NULL == sdbg_devinfo) {
+                        printk(KERN_ERR "%s: out of memory at line %d\n",
+                               __FUNCTION__, __LINE__);
+                        error = -ENOMEM;
+			goto clean;
+                }
+                memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo));
+                sdbg_devinfo->sdbg_host = sdbg_host;
+                list_add_tail(&sdbg_devinfo->dev_list,
+                              &sdbg_host->dev_info_list);
+        }
+
+        spin_lock(&sdebug_host_list_lock);
+        list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
+        spin_unlock(&sdebug_host_list_lock);
+
+        sdbg_host->dev.bus = &pseudo_lld_bus;
+        sdbg_host->dev.parent = &pseudo_primary;
+        sdbg_host->dev.release = &sdebug_release_adapter;
+        sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host);
+
+        error = device_register(&sdbg_host->dev);
+
+        if (error)
+		goto clean;
+
+	++scsi_debug_add_host;
+        return error;
+
+clean:
+	list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
+		sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
+					  dev_list);
+		list_del(&sdbg_devinfo->dev_list);
+		kfree(sdbg_devinfo);
+	}
+
+	kfree(sdbg_host);
+        return error;
+}
+
+static void sdebug_remove_adapter(void)
+{
+        struct sdebug_host_info * sdbg_host = NULL;
+
+        spin_lock(&sdebug_host_list_lock);
+        if (!list_empty(&sdebug_host_list)) {
+                sdbg_host = list_entry(sdebug_host_list.prev,
+                                       struct sdebug_host_info, host_list);
+		list_del(&sdbg_host->host_list);
+	}
+        spin_unlock(&sdebug_host_list_lock);
+
+	if (!sdbg_host)
+		return;
+
+        device_unregister(&sdbg_host->dev);
+        --scsi_debug_add_host;
+}
+
+static int sdebug_driver_probe(struct device * dev)
+{
+        int error = 0;
+        struct sdebug_host_info *sdbg_host;
+        struct Scsi_Host *hpnt;
+
+	sdbg_host = to_sdebug_host(dev);
+
+        hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
+        if (NULL == hpnt) {
+                printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__);
+                error = -ENODEV;
+		return error;
+        }
+
+        sdbg_host->shost = hpnt;
+	*((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
+	if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
+		hpnt->max_id = scsi_debug_num_tgts + 1;
+	else
+		hpnt->max_id = scsi_debug_num_tgts;
+	hpnt->max_lun = scsi_debug_max_luns;
+
+        error = scsi_add_host(hpnt, &sdbg_host->dev);
+        if (error) {
+                printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__);
+                error = -ENODEV;
+		scsi_host_put(hpnt);
+        } else
+		scsi_scan_host(hpnt);
+
+
+        return error;
+}
+
+static int sdebug_driver_remove(struct device * dev)
+{
+        struct list_head *lh, *lh_sf;
+        struct sdebug_host_info *sdbg_host;
+        struct sdebug_dev_info *sdbg_devinfo;
+
+	sdbg_host = to_sdebug_host(dev);
+
+	if (!sdbg_host) {
+		printk(KERN_ERR "%s: Unable to locate host info\n",
+		       __FUNCTION__);
+		return -ENODEV;
+	}
+
+        scsi_remove_host(sdbg_host->shost);
+
+        list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
+                sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
+                                          dev_list);
+                list_del(&sdbg_devinfo->dev_list);
+                kfree(sdbg_devinfo);
+        }
+
+        scsi_host_put(sdbg_host->shost);
+        return 0;
+}
+
+static void sdebug_max_tgts_luns(void)
+{
+	struct sdebug_host_info * sdbg_host;
+	struct Scsi_Host *hpnt;
+
+	spin_lock(&sdebug_host_list_lock);
+	list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
+		hpnt = sdbg_host->shost;
+		if ((hpnt->this_id >= 0) &&
+		    (scsi_debug_num_tgts > hpnt->this_id))
+			hpnt->max_id = scsi_debug_num_tgts + 1;
+		else
+			hpnt->max_id = scsi_debug_num_tgts;
+		hpnt->max_lun = scsi_debug_max_luns;
+	}
+	spin_unlock(&sdebug_host_list_lock);
+}