Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 4076 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
new file mode 100644
index 00000000..182d5a57
--- /dev/null
+++ b/drivers/scsi/scsi_debug.c
@@ -0,0 +1,4076 @@
+/*
+ * 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. To be more
+ *  realistic, the simulated devices have the transport attributes of
+ *  SAS disks.
+ *
+ *
+ *  For documentation see http://sg.danny.cz/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/module.h>
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/slab.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/vmalloc.h>
+#include <linux/moduleparam.h>
+#include <linux/scatterlist.h>
+#include <linux/blkdev.h>
+#include <linux/crc-t10dif.h>
+
+#include <net/checksum.h>
+
+#include <asm/unaligned.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsicam.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_dbg.h>
+
+#include "sd.h"
+#include "scsi_logging.h"
+
+#define SCSI_DEBUG_VERSION "1.82"
+static const char * scsi_debug_version_date = "20100324";
+
+/* Additional Sense Code (ASC) */
+#define NO_ADDITIONAL_SENSE 0x0
+#define LOGICAL_UNIT_NOT_READY 0x4
+#define UNRECOVERED_READ_ERR 0x11
+#define PARAMETER_LIST_LENGTH_ERR 0x1a
+#define INVALID_OPCODE 0x20
+#define ADDR_OUT_OF_RANGE 0x21
+#define INVALID_COMMAND_OPCODE 0x20
+#define INVALID_FIELD_IN_CDB 0x24
+#define INVALID_FIELD_IN_PARAM_LIST 0x26
+#define POWERON_RESET 0x29
+#define SAVING_PARAMS_UNSUP 0x39
+#define TRANSPORT_PROBLEM 0x4b
+#define THRESHOLD_EXCEEDED 0x5d
+#define LOW_POWER_COND_ON 0x5e
+
+/* Additional Sense Code Qualifier (ASCQ) */
+#define ACK_NAK_TO 0x3
+
+#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_ATO 1
+#define DEF_DELAY   1
+#define DEF_DEV_SIZE_MB   8
+#define DEF_DIF 0
+#define DEF_DIX 0
+#define DEF_D_SENSE   0
+#define DEF_EVERY_NTH   0
+#define DEF_FAKE_RW	0
+#define DEF_GUARD 0
+#define DEF_LBPU 0
+#define DEF_LBPWS 0
+#define DEF_LBPWS10 0
+#define DEF_LBPRZ 1
+#define DEF_LOWEST_ALIGNED 0
+#define DEF_NO_LUN_0   0
+#define DEF_NUM_PARTS   0
+#define DEF_OPTS   0
+#define DEF_OPT_BLKS 64
+#define DEF_PHYSBLK_EXP 0
+#define DEF_PTYPE   0
+#define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
+#define DEF_SECTOR_SIZE 512
+#define DEF_UNMAP_ALIGNMENT 0
+#define DEF_UNMAP_GRANULARITY 1
+#define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
+#define DEF_UNMAP_MAX_DESC 256
+#define DEF_VIRTUAL_GB   0
+#define DEF_VPD_USE_HOSTNO 1
+#define DEF_WRITESAME_LENGTH 0xFFFF
+
+/* 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
+#define SCSI_DEBUG_OPT_TRANSPORT_ERR   16
+#define SCSI_DEBUG_OPT_DIF_ERR   32
+#define SCSI_DEBUG_OPT_DIX_ERR   64
+#define SCSI_DEBUG_OPT_MAC_TIMEOUT  128
+/* 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.
+ *   - a TRANSPORT_ERROR is simulated on successful read and write
+ *     commands if SCSI_DEBUG_OPT_TRANSPORT_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.
+ *   - a TRANSPORT_ERROR is simulated on successful read and write
+ *     commands if SCSI_DEBUG_OPT_TRANSPORT_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 */
+#define OPT_MEDIUM_ERR_NUM    10     /* number of consecutive medium errs */
+
+/* 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
+#define SAM2_WLUN_REPORT_LUNS 0xc101
+
+/* Can queue up to this number of commands. Typically commands that
+ * that have a non-zero delay are queued. */
+#define SCSI_DEBUG_CANQUEUE  255
+
+static int scsi_debug_add_host = DEF_NUM_HOST;
+static int scsi_debug_ato = DEF_ATO;
+static int scsi_debug_delay = DEF_DELAY;
+static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
+static int scsi_debug_dif = DEF_DIF;
+static int scsi_debug_dix = DEF_DIX;
+static int scsi_debug_dsense = DEF_D_SENSE;
+static int scsi_debug_every_nth = DEF_EVERY_NTH;
+static int scsi_debug_fake_rw = DEF_FAKE_RW;
+static int scsi_debug_guard = DEF_GUARD;
+static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
+static int scsi_debug_max_luns = DEF_MAX_LUNS;
+static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
+static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;
+static int scsi_debug_no_uld = 0;
+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_opt_blks = DEF_OPT_BLKS;
+static int scsi_debug_opts = DEF_OPTS;
+static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP;
+static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
+static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
+static int scsi_debug_sector_size = DEF_SECTOR_SIZE;
+static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;
+static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
+static unsigned int scsi_debug_lbpu = DEF_LBPU;
+static unsigned int scsi_debug_lbpws = DEF_LBPWS;
+static unsigned int scsi_debug_lbpws10 = DEF_LBPWS10;
+static unsigned int scsi_debug_lbprz = DEF_LBPRZ;
+static unsigned int scsi_debug_unmap_alignment = DEF_UNMAP_ALIGNMENT;
+static unsigned int scsi_debug_unmap_granularity = DEF_UNMAP_GRANULARITY;
+static unsigned int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS;
+static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
+static unsigned int scsi_debug_write_same_length = DEF_WRITESAME_LENGTH;
+
+static int scsi_debug_cmnd_count = 0;
+
+#define DEV_READONLY(TGT)      (0)
+#define DEV_REMOVEABLE(TGT)    (0)
+
+static unsigned int sdebug_store_sectors;
+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 */
+
+#define SDEBUG_MAX_PARTS 4
+
+#define SDEBUG_SENSE_LEN 32
+
+#define SCSI_DEBUG_MAX_CMD_LEN 32
+
+static unsigned int scsi_debug_lbp(void)
+{
+	return scsi_debug_lbpu | scsi_debug_lbpws | scsi_debug_lbpws10;
+}
+
+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;
+	unsigned int wlun;
+	char reset;
+	char stopped;
+	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 unsigned char * fake_storep;	/* ramdisk storage */
+static unsigned char *dif_storep;	/* protection info */
+static void *map_storep;		/* provisioning map */
+
+static unsigned long map_size;
+static int num_aborts = 0;
+static int num_dev_resets = 0;
+static int num_bus_resets = 0;
+static int num_host_resets = 0;
+static int dix_writes;
+static int dix_reads;
+static int dif_errors;
+
+static DEFINE_SPINLOCK(queued_arr_lock);
+static DEFINE_RWLOCK(atomic_rw);
+
+static char sdebug_proc_name[] = "scsi_debug";
+
+static struct bus_type pseudo_lld_bus;
+
+static inline sector_t dif_offset(sector_t sector)
+{
+	return sector << 3;
+}
+
+static struct device_driver sdebug_driverfs_driver = {
+	.name 		= sdebug_proc_name,
+	.bus		= &pseudo_lld_bus,
+};
+
+static const int check_condition_result =
+		(DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+static const int illegal_condition_result =
+	(DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
+
+static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
+				    0, 0, 0x2, 0x4b};
+static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
+			           0, 0, 0x0, 0x0};
+
+static int sdebug_add_adapter(void);
+static void sdebug_remove_adapter(void);
+
+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;
+		/* scsi_debug_max_luns; */
+		hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;
+	}
+	spin_unlock(&sdebug_host_list_lock);
+}
+
+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);
+
+	scsi_build_sense_buffer(scsi_debug_dsense, sbuff, key, asc, 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 void get_data_transfer_info(unsigned char *cmd,
+				   unsigned long long *lba, unsigned int *num,
+				   u32 *ei_lba)
+{
+	*ei_lba = 0;
+
+	switch (*cmd) {
+	case VARIABLE_LENGTH_CMD:
+		*lba = (u64)cmd[19] | (u64)cmd[18] << 8 |
+			(u64)cmd[17] << 16 | (u64)cmd[16] << 24 |
+			(u64)cmd[15] << 32 | (u64)cmd[14] << 40 |
+			(u64)cmd[13] << 48 | (u64)cmd[12] << 56;
+
+		*ei_lba = (u32)cmd[23] | (u32)cmd[22] << 8 |
+			(u32)cmd[21] << 16 | (u32)cmd[20] << 24;
+
+		*num = (u32)cmd[31] | (u32)cmd[30] << 8 | (u32)cmd[29] << 16 |
+			(u32)cmd[28] << 24;
+		break;
+
+	case WRITE_SAME_16:
+	case WRITE_16:
+	case READ_16:
+		*lba = (u64)cmd[9] | (u64)cmd[8] << 8 |
+			(u64)cmd[7] << 16 | (u64)cmd[6] << 24 |
+			(u64)cmd[5] << 32 | (u64)cmd[4] << 40 |
+			(u64)cmd[3] << 48 | (u64)cmd[2] << 56;
+
+		*num = (u32)cmd[13] | (u32)cmd[12] << 8 | (u32)cmd[11] << 16 |
+			(u32)cmd[10] << 24;
+		break;
+	case WRITE_12:
+	case READ_12:
+		*lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
+			(u32)cmd[2] << 24;
+
+		*num = (u32)cmd[9] | (u32)cmd[8] << 8 | (u32)cmd[7] << 16 |
+			(u32)cmd[6] << 24;
+		break;
+	case WRITE_SAME:
+	case WRITE_10:
+	case READ_10:
+	case XDWRITEREAD_10:
+		*lba = (u32)cmd[5] | (u32)cmd[4] << 8 |	(u32)cmd[3] << 16 |
+			(u32)cmd[2] << 24;
+
+		*num = (u32)cmd[8] | (u32)cmd[7] << 8;
+		break;
+	case WRITE_6:
+	case READ_6:
+		*lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
+			(u32)(cmd[1] & 0x1f) << 16;
+		*num = (0 == cmd[4]) ? 256 : cmd[4];
+		break;
+	default:
+		break;
+	}
+}
+
+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_readiness(struct scsi_cmnd * SCpnt, int reset_only,
+			   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;
+	}
+	if ((0 == reset_only) && devip->stopped) {
+		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+			printk(KERN_INFO "scsi_debug: Reporting Not "
+			       "ready: initializing command required\n");
+		mk_sense_buffer(devip, NOT_READY, LOGICAL_UNIT_NOT_READY,
+				0x2);
+		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 act_len;
+	struct scsi_data_buffer *sdb = scsi_in(scp);
+
+	if (!sdb->length)
+		return 0;
+	if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
+		return (DID_ERROR << 16);
+
+	act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents,
+				      arr, arr_len);
+	if (sdb->resid)
+		sdb->resid -= act_len;
+	else
+		sdb->resid = scsi_bufflen(scp) - 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 arr_len)
+{
+	if (!scsi_bufflen(scp))
+		return 0;
+	if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
+		return -1;
+
+	return scsi_sg_copy_to_buffer(scp, arr, arr_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 port_group_id,
+			   int target_dev_id, int dev_id_num,
+			   const char * dev_id_str,
+			   int dev_id_str_len)
+{
+	int num, port_a;
+	char b[32];
+
+	port_a = target_dev_id + 1;
+	/* 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;
+	if (dev_id_num >= 0) {
+		/* NAA-5, Logical unit identifier (binary) */
+		arr[num++] = 0x1;	/* binary (not necessarily sas) */
+		arr[num++] = 0x3;	/* PIV=0, lu, naa */
+		arr[num++] = 0x0;
+		arr[num++] = 0x8;
+		arr[num++] = 0x53;  /* naa-5 ieee company id=0x333333 (fake) */
+		arr[num++] = 0x33;
+		arr[num++] = 0x33;
+		arr[num++] = 0x30;
+		arr[num++] = (dev_id_num >> 24);
+		arr[num++] = (dev_id_num >> 16) & 0xff;
+		arr[num++] = (dev_id_num >> 8) & 0xff;
+		arr[num++] = dev_id_num & 0xff;
+		/* Target relative port number */
+		arr[num++] = 0x61;	/* proto=sas, binary */
+		arr[num++] = 0x94;	/* PIV=1, target port, rel port */
+		arr[num++] = 0x0;	/* reserved */
+		arr[num++] = 0x4;	/* length */
+		arr[num++] = 0x0;	/* reserved */
+		arr[num++] = 0x0;	/* reserved */
+		arr[num++] = 0x0;
+		arr[num++] = 0x1;	/* relative port A */
+	}
+	/* NAA-5, Target port identifier */
+	arr[num++] = 0x61;	/* proto=sas, binary */
+	arr[num++] = 0x93;	/* piv=1, target port, naa */
+	arr[num++] = 0x0;
+	arr[num++] = 0x8;
+	arr[num++] = 0x52;	/* naa-5, company id=0x222222 (fake) */
+	arr[num++] = 0x22;
+	arr[num++] = 0x22;
+	arr[num++] = 0x20;
+	arr[num++] = (port_a >> 24);
+	arr[num++] = (port_a >> 16) & 0xff;
+	arr[num++] = (port_a >> 8) & 0xff;
+	arr[num++] = port_a & 0xff;
+	/* NAA-5, Target port group identifier */
+	arr[num++] = 0x61;	/* proto=sas, binary */
+	arr[num++] = 0x95;	/* piv=1, target port group id */
+	arr[num++] = 0x0;
+	arr[num++] = 0x4;
+	arr[num++] = 0;
+	arr[num++] = 0;
+	arr[num++] = (port_group_id >> 8) & 0xff;
+	arr[num++] = port_group_id & 0xff;
+	/* NAA-5, Target device identifier */
+	arr[num++] = 0x61;	/* proto=sas, binary */
+	arr[num++] = 0xa3;	/* piv=1, target device, naa */
+	arr[num++] = 0x0;
+	arr[num++] = 0x8;
+	arr[num++] = 0x52;	/* naa-5, company id=0x222222 (fake) */
+	arr[num++] = 0x22;
+	arr[num++] = 0x22;
+	arr[num++] = 0x20;
+	arr[num++] = (target_dev_id >> 24);
+	arr[num++] = (target_dev_id >> 16) & 0xff;
+	arr[num++] = (target_dev_id >> 8) & 0xff;
+	arr[num++] = target_dev_id & 0xff;
+	/* SCSI name string: Target device identifier */
+	arr[num++] = 0x63;	/* proto=sas, UTF-8 */
+	arr[num++] = 0xa8;	/* piv=1, target device, SCSI name string */
+	arr[num++] = 0x0;
+	arr[num++] = 24;
+	memcpy(arr + num, "naa.52222220", 12);
+	num += 12;
+	snprintf(b, sizeof(b), "%08X", target_dev_id);
+	memcpy(arr + num, b, 8);
+	num += 8;
+	memset(arr + num, 0, 4);
+	num += 4;
+	return num;
+}
+
+
+static unsigned char vpd84_data[] = {
+/* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0,
+    0x22,0x22,0x22,0x0,0xbb,0x1,
+    0x22,0x22,0x22,0x0,0xbb,0x2,
+};
+
+static int inquiry_evpd_84(unsigned char * arr)
+{
+	memcpy(arr, vpd84_data, sizeof(vpd84_data));
+	return sizeof(vpd84_data);
+}
+
+static int inquiry_evpd_85(unsigned char * arr)
+{
+	int num = 0;
+	const char * na1 = "https://www.kernel.org/config";
+	const char * na2 = "http://www.kernel.org/log";
+	int plen, olen;
+
+	arr[num++] = 0x1;	/* lu, storage config */
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x0;
+	olen = strlen(na1);
+	plen = olen + 1;
+	if (plen % 4)
+		plen = ((plen / 4) + 1) * 4;
+	arr[num++] = plen;	/* length, null termianted, padded */
+	memcpy(arr + num, na1, olen);
+	memset(arr + num + olen, 0, plen - olen);
+	num += plen;
+
+	arr[num++] = 0x4;	/* lu, logging */
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x0;
+	olen = strlen(na2);
+	plen = olen + 1;
+	if (plen % 4)
+		plen = ((plen / 4) + 1) * 4;
+	arr[num++] = plen;	/* length, null terminated, padded */
+	memcpy(arr + num, na2, olen);
+	memset(arr + num + olen, 0, plen - olen);
+	num += plen;
+
+	return num;
+}
+
+/* SCSI ports VPD page */
+static int inquiry_evpd_88(unsigned char * arr, int target_dev_id)
+{
+	int num = 0;
+	int port_a, port_b;
+
+	port_a = target_dev_id + 1;
+	port_b = port_a + 1;
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x0;
+	arr[num++] = 0x1;	/* relative port 1 (primary) */
+	memset(arr + num, 0, 6);
+	num += 6;
+	arr[num++] = 0x0;
+	arr[num++] = 12;	/* length tp descriptor */
+	/* naa-5 target port identifier (A) */
+	arr[num++] = 0x61;	/* proto=sas, binary */
+	arr[num++] = 0x93;	/* PIV=1, target port, NAA */
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x8;	/* length */
+	arr[num++] = 0x52;	/* NAA-5, company_id=0x222222 (fake) */
+	arr[num++] = 0x22;
+	arr[num++] = 0x22;
+	arr[num++] = 0x20;
+	arr[num++] = (port_a >> 24);
+	arr[num++] = (port_a >> 16) & 0xff;
+	arr[num++] = (port_a >> 8) & 0xff;
+	arr[num++] = port_a & 0xff;
+
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x0;
+	arr[num++] = 0x2;	/* relative port 2 (secondary) */
+	memset(arr + num, 0, 6);
+	num += 6;
+	arr[num++] = 0x0;
+	arr[num++] = 12;	/* length tp descriptor */
+	/* naa-5 target port identifier (B) */
+	arr[num++] = 0x61;	/* proto=sas, binary */
+	arr[num++] = 0x93;	/* PIV=1, target port, NAA */
+	arr[num++] = 0x0;	/* reserved */
+	arr[num++] = 0x8;	/* length */
+	arr[num++] = 0x52;	/* NAA-5, company_id=0x222222 (fake) */
+	arr[num++] = 0x22;
+	arr[num++] = 0x22;
+	arr[num++] = 0x20;
+	arr[num++] = (port_b >> 24);
+	arr[num++] = (port_b >> 16) & 0xff;
+	arr[num++] = (port_b >> 8) & 0xff;
+	arr[num++] = port_b & 0xff;
+
+	return num;
+}
+
+
+static unsigned char vpd89_data[] = {
+/* from 4th byte */ 0,0,0,0,
+'l','i','n','u','x',' ',' ',' ',
+'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ',
+'1','2','3','4',
+0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
+0xec,0,0,0,
+0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0,
+0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20,
+0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33,
+0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31,
+0x53,0x41,
+0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
+0x20,0x20,
+0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
+0x10,0x80,
+0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0,
+0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0,
+0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0,
+0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40,
+0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0,
+0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42,
+0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8,
+0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe,
+0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51,
+};
+
+static int inquiry_evpd_89(unsigned char * arr)
+{
+	memcpy(arr, vpd89_data, sizeof(vpd89_data));
+	return sizeof(vpd89_data);
+}
+
+
+/* Block limits VPD page (SBC-3) */
+static unsigned char vpdb0_data[] = {
+	/* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+};
+
+static int inquiry_evpd_b0(unsigned char * arr)
+{
+	unsigned int gran;
+
+	memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
+
+	/* Optimal transfer length granularity */
+	gran = 1 << scsi_debug_physblk_exp;
+	arr[2] = (gran >> 8) & 0xff;
+	arr[3] = gran & 0xff;
+
+	/* Maximum Transfer Length */
+	if (sdebug_store_sectors > 0x400) {
+		arr[4] = (sdebug_store_sectors >> 24) & 0xff;
+		arr[5] = (sdebug_store_sectors >> 16) & 0xff;
+		arr[6] = (sdebug_store_sectors >> 8) & 0xff;
+		arr[7] = sdebug_store_sectors & 0xff;
+	}
+
+	/* Optimal Transfer Length */
+	put_unaligned_be32(scsi_debug_opt_blks, &arr[8]);
+
+	if (scsi_debug_lbpu) {
+		/* Maximum Unmap LBA Count */
+		put_unaligned_be32(scsi_debug_unmap_max_blocks, &arr[16]);
+
+		/* Maximum Unmap Block Descriptor Count */
+		put_unaligned_be32(scsi_debug_unmap_max_desc, &arr[20]);
+	}
+
+	/* Unmap Granularity Alignment */
+	if (scsi_debug_unmap_alignment) {
+		put_unaligned_be32(scsi_debug_unmap_alignment, &arr[28]);
+		arr[28] |= 0x80; /* UGAVALID */
+	}
+
+	/* Optimal Unmap Granularity */
+	put_unaligned_be32(scsi_debug_unmap_granularity, &arr[24]);
+
+	/* Maximum WRITE SAME Length */
+	put_unaligned_be64(scsi_debug_write_same_length, &arr[32]);
+
+	return 0x3c; /* Mandatory page length for Logical Block Provisioning */
+
+	return sizeof(vpdb0_data);
+}
+
+/* Block device characteristics VPD page (SBC-3) */
+static int inquiry_evpd_b1(unsigned char *arr)
+{
+	memset(arr, 0, 0x3c);
+	arr[0] = 0;
+	arr[1] = 1;	/* non rotating medium (e.g. solid state) */
+	arr[2] = 0;
+	arr[3] = 5;	/* less than 1.8" */
+
+	return 0x3c;
+}
+
+/* Logical block provisioning VPD page (SBC-3) */
+static int inquiry_evpd_b2(unsigned char *arr)
+{
+	memset(arr, 0, 0x4);
+	arr[0] = 0;			/* threshold exponent */
+
+	if (scsi_debug_lbpu)
+		arr[1] = 1 << 7;
+
+	if (scsi_debug_lbpws)
+		arr[1] |= 1 << 6;
+
+	if (scsi_debug_lbpws10)
+		arr[1] |= 1 << 5;
+
+	if (scsi_debug_lbprz)
+		arr[1] |= 1 << 2;
+
+	return 0x4;
+}
+
+#define SDEBUG_LONG_INQ_SZ 96
+#define SDEBUG_MAX_INQ_ARR_SZ 584
+
+static int resp_inquiry(struct scsi_cmnd * scp, int target,
+			struct sdebug_dev_info * devip)
+{
+	unsigned char pq_pdt;
+	unsigned char * arr;
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+	int alloc_len, n, ret;
+
+	alloc_len = (cmd[3] << 8) + cmd[4];
+	arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
+	if (! arr)
+		return DID_REQUEUE << 16;
+	if (devip->wlun)
+		pq_pdt = 0x1e;	/* present, wlun */
+	else if (scsi_debug_no_lun_0 && (0 == devip->lun))
+		pq_pdt = 0x7f;	/* not present, no device type */
+	else
+		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);
+		kfree(arr);
+		return check_condition_result;
+	} else if (0x1 & cmd[1]) {  /* EVPD bit set */
+		int lu_id_num, port_group_id, target_dev_id, len;
+		char lu_id_str[6];
+		int host_no = devip->sdbg_host->shost->host_no;
+		
+		port_group_id = (((host_no + 1) & 0x7f) << 8) +
+		    (devip->channel & 0x7f);
+		if (0 == scsi_debug_vpd_use_hostno)
+			host_no = 0;
+		lu_id_num = devip->wlun ? -1 : (((host_no + 1) * 2000) +
+			    (devip->target * 1000) + devip->lun);
+		target_dev_id = ((host_no + 1) * 2000) +
+				 (devip->target * 1000) - 3;
+		len = scnprintf(lu_id_str, 6, "%d", lu_id_num);
+		if (0 == cmd[2]) { /* supported vital product data pages */
+			arr[1] = cmd[2];	/*sanity */
+			n = 4;
+			arr[n++] = 0x0;   /* this page */
+			arr[n++] = 0x80;  /* unit serial number */
+			arr[n++] = 0x83;  /* device identification */
+			arr[n++] = 0x84;  /* software interface ident. */
+			arr[n++] = 0x85;  /* management network addresses */
+			arr[n++] = 0x86;  /* extended inquiry */
+			arr[n++] = 0x87;  /* mode page policy */
+			arr[n++] = 0x88;  /* SCSI ports */
+			arr[n++] = 0x89;  /* ATA information */
+			arr[n++] = 0xb0;  /* Block limits (SBC) */
+			arr[n++] = 0xb1;  /* Block characteristics (SBC) */
+			if (scsi_debug_lbp()) /* Logical Block Prov. (SBC) */
+				arr[n++] = 0xb2;
+			arr[3] = n - 4;	  /* number of supported VPD pages */
+		} else if (0x80 == cmd[2]) { /* unit serial number */
+			arr[1] = cmd[2];	/*sanity */
+			arr[3] = len;
+			memcpy(&arr[4], lu_id_str, len);
+		} else if (0x83 == cmd[2]) { /* device identification */
+			arr[1] = cmd[2];	/*sanity */
+			arr[3] = inquiry_evpd_83(&arr[4], port_group_id,
+						 target_dev_id, lu_id_num,
+						 lu_id_str, len);
+		} else if (0x84 == cmd[2]) { /* Software interface ident. */
+			arr[1] = cmd[2];	/*sanity */
+			arr[3] = inquiry_evpd_84(&arr[4]);
+		} else if (0x85 == cmd[2]) { /* Management network addresses */
+			arr[1] = cmd[2];	/*sanity */
+			arr[3] = inquiry_evpd_85(&arr[4]);
+		} else if (0x86 == cmd[2]) { /* extended inquiry */
+			arr[1] = cmd[2];	/*sanity */
+			arr[3] = 0x3c;	/* number of following entries */
+			if (scsi_debug_dif == SD_DIF_TYPE3_PROTECTION)
+				arr[4] = 0x4;	/* SPT: GRD_CHK:1 */
+			else if (scsi_debug_dif)
+				arr[4] = 0x5;   /* SPT: GRD_CHK:1, REF_CHK:1 */
+			else
+				arr[4] = 0x0;   /* no protection stuff */
+			arr[5] = 0x7;   /* head of q, ordered + simple q's */
+		} else if (0x87 == cmd[2]) { /* mode page policy */
+			arr[1] = cmd[2];	/*sanity */
+			arr[3] = 0x8;	/* number of following entries */
+			arr[4] = 0x2;	/* disconnect-reconnect mp */
+			arr[6] = 0x80;	/* mlus, shared */
+			arr[8] = 0x18;	 /* protocol specific lu */
+			arr[10] = 0x82;	 /* mlus, per initiator port */
+		} else if (0x88 == cmd[2]) { /* SCSI Ports */
+			arr[1] = cmd[2];	/*sanity */
+			arr[3] = inquiry_evpd_88(&arr[4], target_dev_id);
+		} else if (0x89 == cmd[2]) { /* ATA information */
+			arr[1] = cmd[2];        /*sanity */
+			n = inquiry_evpd_89(&arr[4]);
+			arr[2] = (n >> 8);
+			arr[3] = (n & 0xff);
+		} else if (0xb0 == cmd[2]) { /* Block limits (SBC) */
+			arr[1] = cmd[2];        /*sanity */
+			arr[3] = inquiry_evpd_b0(&arr[4]);
+		} else if (0xb1 == cmd[2]) { /* Block characteristics (SBC) */
+			arr[1] = cmd[2];        /*sanity */
+			arr[3] = inquiry_evpd_b1(&arr[4]);
+		} else if (0xb2 == cmd[2]) { /* Logical Block Prov. (SBC) */
+			arr[1] = cmd[2];        /*sanity */
+			arr[3] = inquiry_evpd_b2(&arr[4]);
+		} else {
+			/* Illegal request, invalid field in cdb */
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_FIELD_IN_CDB, 0);
+			kfree(arr);
+			return check_condition_result;
+		}
+		len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
+		ret = fill_from_dev_buffer(scp, arr,
+			    min(len, SDEBUG_MAX_INQ_ARR_SZ));
+		kfree(arr);
+		return ret;
+	}
+	/* 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[5] = scsi_debug_dif ? 1 : 0; /* PROTECT bit */
+	if (0 == scsi_debug_vpd_use_hostno)
+		arr[5] = 0x10; /* claim: implicit TGPS */
+	arr[6] = 0x10; /* claim: MultiP */
+	/* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
+	arr[7] = 0xa; /* claim: 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] = 0x77; /* SAM-3 ANSI */
+	arr[60] = 0x3; arr[61] = 0x14;  /* SPC-3 ANSI */
+	n = 62;
+	if (scsi_debug_ptype == 0) {
+		arr[n++] = 0x3; arr[n++] = 0x3d; /* SBC-2 ANSI */
+	} else if (scsi_debug_ptype == 1) {
+		arr[n++] = 0x3; arr[n++] = 0x60; /* SSC-2 no version */
+	}
+	arr[n++] = 0xc; arr[n++] = 0xf;  /* SAS-1.1 rev 10 */
+	ret = fill_from_dev_buffer(scp, arr,
+			    min(alloc_len, SDEBUG_LONG_INQ_SZ));
+	kfree(arr);
+	return ret;
+}
+
+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 want_dsense;
+	int len = 18;
+
+	memset(arr, 0, sizeof(arr));
+	if (devip->reset == 1)
+		mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
+	want_dsense = !!(cmd[1] & 1) || scsi_debug_dsense;
+	sbuff = devip->sense_buff;
+	if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) {
+		if (want_dsense) {
+			arr[0] = 0x72;
+			arr[1] = 0x0;		/* NO_SENSE in sense_key */
+			arr[2] = THRESHOLD_EXCEEDED;
+			arr[3] = 0xff;		/* TEST set and MRIE==6 */
+		} else {
+			arr[0] = 0x70;
+			arr[2] = 0x0;		/* NO_SENSE in sense_key */
+			arr[7] = 0xa;   	/* 18 byte sense buffer */
+			arr[12] = THRESHOLD_EXCEEDED;
+			arr[13] = 0xff;		/* TEST set and MRIE==6 */
+		}
+	} else {
+		memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
+		if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
+			/* DESC bit set and sense_buff in fixed format */
+			memset(arr, 0, sizeof(arr));
+			arr[0] = 0x72;
+			arr[1] = sbuff[2];     /* sense key */
+			arr[2] = sbuff[12];    /* asc */
+			arr[3] = sbuff[13];    /* ascq */
+			len = 8;
+		}
+	}
+	mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
+	return fill_from_dev_buffer(scp, arr, len);
+}
+
+static int resp_start_stop(struct scsi_cmnd * scp,
+			   struct sdebug_dev_info * devip)
+{
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+	int power_cond, errsts, start;
+
+	if ((errsts = check_readiness(scp, 1, devip)))
+		return errsts;
+	power_cond = (cmd[4] & 0xf0) >> 4;
+	if (power_cond) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
+			       	0);
+		return check_condition_result;
+	}
+	start = cmd[4] & 1;
+	if (start == devip->stopped)
+		devip->stopped = !start;
+	return 0;
+}
+
+static sector_t get_sdebug_capacity(void)
+{
+	if (scsi_debug_virtual_gb > 0)
+		return (sector_t)scsi_debug_virtual_gb *
+			(1073741824 / scsi_debug_sector_size);
+	else
+		return sdebug_store_sectors;
+}
+
+#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 int capac;
+	int errsts;
+
+	if ((errsts = check_readiness(scp, 1, devip)))
+		return errsts;
+	/* following just in case virtual_gb changed */
+	sdebug_capacity = get_sdebug_capacity();
+	memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
+	if (sdebug_capacity < 0xffffffff) {
+		capac = (unsigned int)sdebug_capacity - 1;
+		arr[0] = (capac >> 24);
+		arr[1] = (capac >> 16) & 0xff;
+		arr[2] = (capac >> 8) & 0xff;
+		arr[3] = capac & 0xff;
+	} else {
+		arr[0] = 0xff;
+		arr[1] = 0xff;
+		arr[2] = 0xff;
+		arr[3] = 0xff;
+	}
+	arr[6] = (scsi_debug_sector_size >> 8) & 0xff;
+	arr[7] = scsi_debug_sector_size & 0xff;
+	return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
+}
+
+#define SDEBUG_READCAP16_ARR_SZ 32
+static int resp_readcap16(struct scsi_cmnd * scp,
+			  struct sdebug_dev_info * devip)
+{
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+	unsigned char arr[SDEBUG_READCAP16_ARR_SZ];
+	unsigned long long capac;
+	int errsts, k, alloc_len;
+
+	if ((errsts = check_readiness(scp, 1, devip)))
+		return errsts;
+	alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8)
+		     + cmd[13]);
+	/* following just in case virtual_gb changed */
+	sdebug_capacity = get_sdebug_capacity();
+	memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
+	capac = sdebug_capacity - 1;
+	for (k = 0; k < 8; ++k, capac >>= 8)
+		arr[7 - k] = capac & 0xff;
+	arr[8] = (scsi_debug_sector_size >> 24) & 0xff;
+	arr[9] = (scsi_debug_sector_size >> 16) & 0xff;
+	arr[10] = (scsi_debug_sector_size >> 8) & 0xff;
+	arr[11] = scsi_debug_sector_size & 0xff;
+	arr[13] = scsi_debug_physblk_exp & 0xf;
+	arr[14] = (scsi_debug_lowest_aligned >> 8) & 0x3f;
+
+	if (scsi_debug_lbp()) {
+		arr[14] |= 0x80; /* LBPME */
+		if (scsi_debug_lbprz)
+			arr[14] |= 0x40; /* LBPRZ */
+	}
+
+	arr[15] = scsi_debug_lowest_aligned & 0xff;
+
+	if (scsi_debug_dif) {
+		arr[12] = (scsi_debug_dif - 1) << 1; /* P_TYPE */
+		arr[12] |= 1; /* PROT_EN */
+	}
+
+	return fill_from_dev_buffer(scp, arr,
+				    min(alloc_len, SDEBUG_READCAP16_ARR_SZ));
+}
+
+#define SDEBUG_MAX_TGTPGS_ARR_SZ 1412
+
+static int resp_report_tgtpgs(struct scsi_cmnd * scp,
+			      struct sdebug_dev_info * devip)
+{
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+	unsigned char * arr;
+	int host_no = devip->sdbg_host->shost->host_no;
+	int n, ret, alen, rlen;
+	int port_group_a, port_group_b, port_a, port_b;
+
+	alen = ((cmd[6] << 24) + (cmd[7] << 16) + (cmd[8] << 8)
+		+ cmd[9]);
+
+	arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
+	if (! arr)
+		return DID_REQUEUE << 16;
+	/*
+	 * EVPD page 0x88 states we have two ports, one
+	 * real and a fake port with no device connected.
+	 * So we create two port groups with one port each
+	 * and set the group with port B to unavailable.
+	 */
+	port_a = 0x1; /* relative port A */
+	port_b = 0x2; /* relative port B */
+	port_group_a = (((host_no + 1) & 0x7f) << 8) +
+	    (devip->channel & 0x7f);
+	port_group_b = (((host_no + 1) & 0x7f) << 8) +
+	    (devip->channel & 0x7f) + 0x80;
+
+	/*
+	 * The asymmetric access state is cycled according to the host_id.
+	 */
+	n = 4;
+	if (0 == scsi_debug_vpd_use_hostno) {
+	    arr[n++] = host_no % 3; /* Asymm access state */
+	    arr[n++] = 0x0F; /* claim: all states are supported */
+	} else {
+	    arr[n++] = 0x0; /* Active/Optimized path */
+	    arr[n++] = 0x01; /* claim: only support active/optimized paths */
+	}
+	arr[n++] = (port_group_a >> 8) & 0xff;
+	arr[n++] = port_group_a & 0xff;
+	arr[n++] = 0;    /* Reserved */
+	arr[n++] = 0;    /* Status code */
+	arr[n++] = 0;    /* Vendor unique */
+	arr[n++] = 0x1;  /* One port per group */
+	arr[n++] = 0;    /* Reserved */
+	arr[n++] = 0;    /* Reserved */
+	arr[n++] = (port_a >> 8) & 0xff;
+	arr[n++] = port_a & 0xff;
+	arr[n++] = 3;    /* Port unavailable */
+	arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */
+	arr[n++] = (port_group_b >> 8) & 0xff;
+	arr[n++] = port_group_b & 0xff;
+	arr[n++] = 0;    /* Reserved */
+	arr[n++] = 0;    /* Status code */
+	arr[n++] = 0;    /* Vendor unique */
+	arr[n++] = 0x1;  /* One port per group */
+	arr[n++] = 0;    /* Reserved */
+	arr[n++] = 0;    /* Reserved */
+	arr[n++] = (port_b >> 8) & 0xff;
+	arr[n++] = port_b & 0xff;
+
+	rlen = n - 4;
+	arr[0] = (rlen >> 24) & 0xff;
+	arr[1] = (rlen >> 16) & 0xff;
+	arr[2] = (rlen >> 8) & 0xff;
+	arr[3] = rlen & 0xff;
+
+	/*
+	 * Return the smallest value of either
+	 * - The allocated length
+	 * - The constructed command length
+	 * - The maximum array size
+	 */
+	rlen = min(alen,n);
+	ret = fill_from_dev_buffer(scp, arr,
+				   min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
+	kfree(arr);
+	return ret;
+}
+
+/* <<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] = (scsi_debug_sector_size >> 8) & 0xff;
+	p[13] = scsi_debug_sector_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 ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0,
+				        0, 0, 0, 0};
+	unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
+				     0, 0, 0x2, 0x4b};
+
+	if (scsi_debug_dsense)
+		ctrl_m_pg[2] |= 0x4;
+	else
+		ctrl_m_pg[2] &= ~0x4;
+
+	if (scsi_debug_ato)
+		ctrl_m_pg[5] |= 0x80; /* ATO=1 */
+
+	memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
+	if (1 == pcontrol)
+		memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg));
+	else if (2 == pcontrol)
+		memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg));
+	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 ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0,
+				       0, 0, 0x0, 0x0};
+	unsigned char d_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)
+		memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg));
+	else if (2 == pcontrol)
+		memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg));
+	return sizeof(iec_m_pg);
+}
+
+static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target)
+{	/* SAS SSP mode page - short format for mode_sense */
+	unsigned char sas_sf_m_pg[] = {0x19, 0x6,
+		0x6, 0x0, 0x7, 0xd0, 0x0, 0x0};
+
+	memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg));
+	if (1 == pcontrol)
+		memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2);
+	return sizeof(sas_sf_m_pg);
+}
+
+
+static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target,
+			      int target_dev_id)
+{	/* SAS phy control and discover mode page for mode_sense */
+	unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2,
+		    0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0,
+		    0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
+		    0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
+		    0x2, 0, 0, 0, 0, 0, 0, 0,
+		    0x88, 0x99, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0,
+		    0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0,
+		    0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
+		    0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
+		    0x3, 0, 0, 0, 0, 0, 0, 0,
+		    0x88, 0x99, 0, 0, 0, 0, 0, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0,
+		};
+	int port_a, port_b;
+
+	port_a = target_dev_id + 1;
+	port_b = port_a + 1;
+	memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg));
+	p[20] = (port_a >> 24);
+	p[21] = (port_a >> 16) & 0xff;
+	p[22] = (port_a >> 8) & 0xff;
+	p[23] = port_a & 0xff;
+	p[48 + 20] = (port_b >> 24);
+	p[48 + 21] = (port_b >> 16) & 0xff;
+	p[48 + 22] = (port_b >> 8) & 0xff;
+	p[48 + 23] = port_b & 0xff;
+	if (1 == pcontrol)
+		memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4);
+	return sizeof(sas_pcd_m_pg);
+}
+
+static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol)
+{	/* SAS SSP shared protocol specific port mode subpage */
+	unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0,
+		    0, 0, 0, 0, 0, 0, 0, 0,
+		};
+
+	memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg));
+	if (1 == pcontrol)
+		memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4);
+	return sizeof(sas_sha_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, llbaa;
+	int pcontrol, pcode, subpcode, bd_len;
+	unsigned char dev_spec;
+	int k, alloc_len, msense_6, offset, len, errsts, target_dev_id;
+	unsigned char * ap;
+	unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+
+	if ((errsts = check_readiness(scp, 1, 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]);
+	llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10);
+	if ((0 == scsi_debug_ptype) && (0 == dbd))
+		bd_len = llbaa ? 16 : 8;
+	else
+		bd_len = 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;
+	}
+	target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
+			(devip->target * 1000) - 3;
+	/* set DPOFUA bit for disks */
+	if (0 == scsi_debug_ptype)
+		dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10;
+	else
+		dev_spec = 0x0;
+	if (msense_6) {
+		arr[2] = dev_spec;
+		arr[3] = bd_len;
+		offset = 4;
+	} else {
+		arr[3] = dev_spec;
+		if (16 == bd_len)
+			arr[4] = 0x1;	/* set LONGLBA bit */
+		arr[7] = bd_len;	/* assume 255 or less */
+		offset = 8;
+	}
+	ap = arr + offset;
+	if ((bd_len > 0) && (!sdebug_capacity))
+		sdebug_capacity = get_sdebug_capacity();
+
+	if (8 == bd_len) {
+		if (sdebug_capacity > 0xfffffffe) {
+			ap[0] = 0xff;
+			ap[1] = 0xff;
+			ap[2] = 0xff;
+			ap[3] = 0xff;
+		} else {
+			ap[0] = (sdebug_capacity >> 24) & 0xff;
+			ap[1] = (sdebug_capacity >> 16) & 0xff;
+			ap[2] = (sdebug_capacity >> 8) & 0xff;
+			ap[3] = sdebug_capacity & 0xff;
+		}
+		ap[6] = (scsi_debug_sector_size >> 8) & 0xff;
+		ap[7] = scsi_debug_sector_size & 0xff;
+		offset += bd_len;
+		ap = arr + offset;
+	} else if (16 == bd_len) {
+		unsigned long long capac = sdebug_capacity;
+
+        	for (k = 0; k < 8; ++k, capac >>= 8)
+                	ap[7 - k] = capac & 0xff;
+		ap[12] = (scsi_debug_sector_size >> 24) & 0xff;
+		ap[13] = (scsi_debug_sector_size >> 16) & 0xff;
+		ap[14] = (scsi_debug_sector_size >> 8) & 0xff;
+		ap[15] = scsi_debug_sector_size & 0xff;
+		offset += bd_len;
+		ap = arr + offset;
+	}
+
+	if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {
+		/* 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 0x19:	/* if spc==1 then sas phy, control+discover */
+		if ((subpcode > 0x2) && (subpcode < 0xff)) {
+		        mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_FIELD_IN_CDB, 0);
+			return check_condition_result;
+	        }
+		len = 0;
+		if ((0x0 == subpcode) || (0xff == subpcode))
+			len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
+		if ((0x1 == subpcode) || (0xff == subpcode))
+			len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,
+						  target_dev_id);
+		if ((0x2 == subpcode) || (0xff == subpcode))
+			len += resp_sas_sha_m_spg(ap + len, pcontrol);
+		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 */
+		if ((0 == subpcode) || (0xff == subpcode)) {
+			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_sas_sf_m_pg(ap + len, pcontrol, target);
+			if (0xff == subpcode) {
+				len += resp_sas_pcd_m_spg(ap + len, pcontrol,
+						  target, target_dev_id);
+				len += resp_sas_sha_m_spg(ap + len, pcontrol);
+			}
+			len += resp_iec_m_pg(ap + len, pcontrol, target);
+		} else {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_FIELD_IN_CDB, 0);
+			return check_condition_result;
+                }
+		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));
+}
+
+#define SDEBUG_MAX_MSELECT_SZ 512
+
+static int resp_mode_select(struct scsi_cmnd * scp, int mselect6,
+			    struct sdebug_dev_info * devip)
+{
+	int pf, sp, ps, md_len, bd_len, off, spf, pg_len;
+	int param_len, res, errsts, mpage;
+	unsigned char arr[SDEBUG_MAX_MSELECT_SZ];
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+
+	if ((errsts = check_readiness(scp, 1, devip)))
+		return errsts;
+	memset(arr, 0, sizeof(arr));
+	pf = cmd[1] & 0x10;
+	sp = cmd[1] & 0x1;
+	param_len = mselect6 ? cmd[4] : ((cmd[7] << 8) + cmd[8]);
+	if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST,
+				INVALID_FIELD_IN_CDB, 0);
+		return check_condition_result;
+	}
+        res = fetch_to_dev_buffer(scp, arr, param_len);
+        if (-1 == res)
+                return (DID_ERROR << 16);
+        else if ((res < param_len) &&
+                 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
+                printk(KERN_INFO "scsi_debug: mode_select: cdb indicated=%d, "
+                       " IO sent=%d bytes\n", param_len, res);
+	md_len = mselect6 ? (arr[0] + 1) : ((arr[0] << 8) + arr[1] + 2);
+	bd_len = mselect6 ? arr[3] : ((arr[6] << 8) + arr[7]);
+	if (md_len > 2) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST,
+				INVALID_FIELD_IN_PARAM_LIST, 0);
+		return check_condition_result;
+	}
+	off = bd_len + (mselect6 ? 4 : 8);
+	mpage = arr[off] & 0x3f;
+	ps = !!(arr[off] & 0x80);
+	if (ps) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST,
+				INVALID_FIELD_IN_PARAM_LIST, 0);
+		return check_condition_result;
+	}
+	spf = !!(arr[off] & 0x40);
+	pg_len = spf ? ((arr[off + 2] << 8) + arr[off + 3] + 4) :
+		       (arr[off + 1] + 2);
+	if ((pg_len + off) > param_len) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST,
+				PARAMETER_LIST_LENGTH_ERR, 0);
+		return check_condition_result;
+	}
+	switch (mpage) {
+	case 0xa:      /* Control Mode page */
+		if (ctrl_m_pg[1] == arr[off + 1]) {
+			memcpy(ctrl_m_pg + 2, arr + off + 2,
+			       sizeof(ctrl_m_pg) - 2);
+			scsi_debug_dsense = !!(ctrl_m_pg[2] & 0x4);
+			return 0;
+		}
+		break;
+	case 0x1c:      /* Informational Exceptions Mode page */
+		if (iec_m_pg[1] == arr[off + 1]) {
+			memcpy(iec_m_pg + 2, arr + off + 2,
+			       sizeof(iec_m_pg) - 2);
+			return 0;
+		}
+		break;
+	default:
+		break;
+	}
+	mk_sense_buffer(devip, ILLEGAL_REQUEST,
+			INVALID_FIELD_IN_PARAM_LIST, 0);
+	return check_condition_result;
+}
+
+static int resp_temp_l_pg(unsigned char * arr)
+{
+	unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38,
+				     0x0, 0x1, 0x3, 0x2, 0x0, 65,
+		};
+
+        memcpy(arr, temp_l_pg, sizeof(temp_l_pg));
+        return sizeof(temp_l_pg);
+}
+
+static int resp_ie_l_pg(unsigned char * arr)
+{
+	unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38,
+		};
+
+        memcpy(arr, ie_l_pg, sizeof(ie_l_pg));
+	if (iec_m_pg[2] & 0x4) {	/* TEST bit set */
+		arr[4] = THRESHOLD_EXCEEDED;
+		arr[5] = 0xff;
+	}
+        return sizeof(ie_l_pg);
+}
+
+#define SDEBUG_MAX_LSENSE_SZ 512
+
+static int resp_log_sense(struct scsi_cmnd * scp,
+                          struct sdebug_dev_info * devip)
+{
+	int ppc, sp, pcontrol, pcode, subpcode, alloc_len, errsts, len, n;
+	unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
+	unsigned char *cmd = (unsigned char *)scp->cmnd;
+
+	if ((errsts = check_readiness(scp, 1, devip)))
+		return errsts;
+	memset(arr, 0, sizeof(arr));
+	ppc = cmd[1] & 0x2;
+	sp = cmd[1] & 0x1;
+	if (ppc || sp) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST,
+				INVALID_FIELD_IN_CDB, 0);
+		return check_condition_result;
+	}
+	pcontrol = (cmd[2] & 0xc0) >> 6;
+	pcode = cmd[2] & 0x3f;
+	subpcode = cmd[3] & 0xff;
+	alloc_len = (cmd[7] << 8) + cmd[8];
+	arr[0] = pcode;
+	if (0 == subpcode) {
+		switch (pcode) {
+		case 0x0:	/* Supported log pages log page */
+			n = 4;
+			arr[n++] = 0x0;		/* this page */
+			arr[n++] = 0xd;		/* Temperature */
+			arr[n++] = 0x2f;	/* Informational exceptions */
+			arr[3] = n - 4;
+			break;
+		case 0xd:	/* Temperature log page */
+			arr[3] = resp_temp_l_pg(arr + 4);
+			break;
+		case 0x2f:	/* Informational exceptions log page */
+			arr[3] = resp_ie_l_pg(arr + 4);
+			break;
+		default:
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_FIELD_IN_CDB, 0);
+			return check_condition_result;
+		}
+	} else if (0xff == subpcode) {
+		arr[0] |= 0x40;
+		arr[1] = subpcode;
+		switch (pcode) {
+		case 0x0:	/* Supported log pages and subpages log page */
+			n = 4;
+			arr[n++] = 0x0;
+			arr[n++] = 0x0;		/* 0,0 page */
+			arr[n++] = 0x0;
+			arr[n++] = 0xff;	/* this page */
+			arr[n++] = 0xd;
+			arr[n++] = 0x0;		/* Temperature */
+			arr[n++] = 0x2f;
+			arr[n++] = 0x0;	/* Informational exceptions */
+			arr[3] = n - 4;
+			break;
+		case 0xd:	/* Temperature subpages */
+			n = 4;
+			arr[n++] = 0xd;
+			arr[n++] = 0x0;		/* Temperature */
+			arr[3] = n - 4;
+			break;
+		case 0x2f:	/* Informational exceptions subpages */
+			n = 4;
+			arr[n++] = 0x2f;
+			arr[n++] = 0x0;		/* Informational exceptions */
+			arr[3] = n - 4;
+			break;
+		default:
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_FIELD_IN_CDB, 0);
+			return check_condition_result;
+		}
+	} else {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST,
+				INVALID_FIELD_IN_CDB, 0);
+		return check_condition_result;
+	}
+	len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
+	return fill_from_dev_buffer(scp, arr,
+		    min(len, SDEBUG_MAX_INQ_ARR_SZ));
+}
+
+static int check_device_access_params(struct sdebug_dev_info *devi,
+				      unsigned long long lba, unsigned int num)
+{
+	if (lba + num > sdebug_capacity) {
+		mk_sense_buffer(devi, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 0);
+		return check_condition_result;
+	}
+	/* transfer length excessive (tie in to block limits VPD page) */
+	if (num > sdebug_store_sectors) {
+		mk_sense_buffer(devi, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
+		return check_condition_result;
+	}
+	return 0;
+}
+
+static int do_device_access(struct scsi_cmnd *scmd,
+			    struct sdebug_dev_info *devi,
+			    unsigned long long lba, unsigned int num, int write)
+{
+	int ret;
+	unsigned long long block, rest = 0;
+	int (*func)(struct scsi_cmnd *, unsigned char *, int);
+
+	func = write ? fetch_to_dev_buffer : fill_from_dev_buffer;
+
+	block = do_div(lba, sdebug_store_sectors);
+	if (block + num > sdebug_store_sectors)
+		rest = block + num - sdebug_store_sectors;
+
+	ret = func(scmd, fake_storep + (block * scsi_debug_sector_size),
+		   (num - rest) * scsi_debug_sector_size);
+	if (!ret && rest)
+		ret = func(scmd, fake_storep, rest * scsi_debug_sector_size);
+
+	return ret;
+}
+
+static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
+			    unsigned int sectors, u32 ei_lba)
+{
+	unsigned int i, resid;
+	struct scatterlist *psgl;
+	struct sd_dif_tuple *sdt;
+	sector_t sector;
+	sector_t tmp_sec = start_sec;
+	void *paddr;
+
+	start_sec = do_div(tmp_sec, sdebug_store_sectors);
+
+	sdt = (struct sd_dif_tuple *)(dif_storep + dif_offset(start_sec));
+
+	for (i = 0 ; i < sectors ; i++) {
+		u16 csum;
+
+		if (sdt[i].app_tag == 0xffff)
+			continue;
+
+		sector = start_sec + i;
+
+		switch (scsi_debug_guard) {
+		case 1:
+			csum = ip_compute_csum(fake_storep +
+					       sector * scsi_debug_sector_size,
+					       scsi_debug_sector_size);
+			break;
+		case 0:
+			csum = crc_t10dif(fake_storep +
+					  sector * scsi_debug_sector_size,
+					  scsi_debug_sector_size);
+			csum = cpu_to_be16(csum);
+			break;
+		default:
+			BUG();
+		}
+
+		if (sdt[i].guard_tag != csum) {
+			printk(KERN_ERR "%s: GUARD check failed on sector %lu" \
+			       " rcvd 0x%04x, data 0x%04x\n", __func__,
+			       (unsigned long)sector,
+			       be16_to_cpu(sdt[i].guard_tag),
+			       be16_to_cpu(csum));
+			dif_errors++;
+			return 0x01;
+		}
+
+		if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
+		    be32_to_cpu(sdt[i].ref_tag) != (sector & 0xffffffff)) {
+			printk(KERN_ERR "%s: REF check failed on sector %lu\n",
+			       __func__, (unsigned long)sector);
+			dif_errors++;
+			return 0x03;
+		}
+
+		if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
+		    be32_to_cpu(sdt[i].ref_tag) != ei_lba) {
+			printk(KERN_ERR "%s: REF check failed on sector %lu\n",
+			       __func__, (unsigned long)sector);
+			dif_errors++;
+			return 0x03;
+		}
+
+		ei_lba++;
+	}
+
+	resid = sectors * 8; /* Bytes of protection data to copy into sgl */
+	sector = start_sec;
+
+	scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
+		int len = min(psgl->length, resid);
+
+		paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
+		memcpy(paddr, dif_storep + dif_offset(sector), len);
+
+		sector += len >> 3;
+		if (sector >= sdebug_store_sectors) {
+			/* Force wrap */
+			tmp_sec = sector;
+			sector = do_div(tmp_sec, sdebug_store_sectors);
+		}
+		resid -= len;
+		kunmap_atomic(paddr);
+	}
+
+	dix_reads++;
+
+	return 0;
+}
+
+static int resp_read(struct scsi_cmnd *SCpnt, unsigned long long lba,
+		     unsigned int num, struct sdebug_dev_info *devip,
+		     u32 ei_lba)
+{
+	unsigned long iflags;
+	int ret;
+
+	ret = check_device_access_params(devip, lba, num);
+	if (ret)
+		return ret;
+
+	if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
+	    (lba <= (OPT_MEDIUM_ERR_ADDR + OPT_MEDIUM_ERR_NUM - 1)) &&
+	    ((lba + num) > OPT_MEDIUM_ERR_ADDR)) {
+		/* claim unrecoverable read error */
+		mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0);
+		/* set info field and valid bit for fixed descriptor */
+		if (0x70 == (devip->sense_buff[0] & 0x7f)) {
+			devip->sense_buff[0] |= 0x80;	/* Valid bit */
+			ret = (lba < OPT_MEDIUM_ERR_ADDR)
+			      ? OPT_MEDIUM_ERR_ADDR : (int)lba;
+			devip->sense_buff[3] = (ret >> 24) & 0xff;
+			devip->sense_buff[4] = (ret >> 16) & 0xff;
+			devip->sense_buff[5] = (ret >> 8) & 0xff;
+			devip->sense_buff[6] = ret & 0xff;
+		}
+	        scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
+		return check_condition_result;
+	}
+
+	/* DIX + T10 DIF */
+	if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
+		int prot_ret = prot_verify_read(SCpnt, lba, num, ei_lba);
+
+		if (prot_ret) {
+			mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, prot_ret);
+			return illegal_condition_result;
+		}
+	}
+
+	read_lock_irqsave(&atomic_rw, iflags);
+	ret = do_device_access(SCpnt, devip, lba, num, 0);
+	read_unlock_irqrestore(&atomic_rw, iflags);
+	return ret;
+}
+
+void dump_sector(unsigned char *buf, int len)
+{
+	int i, j;
+
+	printk(KERN_ERR ">>> Sector Dump <<<\n");
+
+	for (i = 0 ; i < len ; i += 16) {
+		printk(KERN_ERR "%04d: ", i);
+
+		for (j = 0 ; j < 16 ; j++) {
+			unsigned char c = buf[i+j];
+			if (c >= 0x20 && c < 0x7e)
+				printk(" %c ", buf[i+j]);
+			else
+				printk("%02x ", buf[i+j]);
+		}
+
+		printk("\n");
+	}
+}
+
+static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
+			     unsigned int sectors, u32 ei_lba)
+{
+	int i, j, ret;
+	struct sd_dif_tuple *sdt;
+	struct scatterlist *dsgl = scsi_sglist(SCpnt);
+	struct scatterlist *psgl = scsi_prot_sglist(SCpnt);
+	void *daddr, *paddr;
+	sector_t tmp_sec = start_sec;
+	sector_t sector;
+	int ppage_offset;
+	unsigned short csum;
+
+	sector = do_div(tmp_sec, sdebug_store_sectors);
+
+	BUG_ON(scsi_sg_count(SCpnt) == 0);
+	BUG_ON(scsi_prot_sg_count(SCpnt) == 0);
+
+	paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
+	ppage_offset = 0;
+
+	/* For each data page */
+	scsi_for_each_sg(SCpnt, dsgl, scsi_sg_count(SCpnt), i) {
+		daddr = kmap_atomic(sg_page(dsgl)) + dsgl->offset;
+
+		/* For each sector-sized chunk in data page */
+		for (j = 0 ; j < dsgl->length ; j += scsi_debug_sector_size) {
+
+			/* If we're at the end of the current
+			 * protection page advance to the next one
+			 */
+			if (ppage_offset >= psgl->length) {
+				kunmap_atomic(paddr);
+				psgl = sg_next(psgl);
+				BUG_ON(psgl == NULL);
+				paddr = kmap_atomic(sg_page(psgl))
+					+ psgl->offset;
+				ppage_offset = 0;
+			}
+
+			sdt = paddr + ppage_offset;
+
+			switch (scsi_debug_guard) {
+			case 1:
+				csum = ip_compute_csum(daddr,
+						       scsi_debug_sector_size);
+				break;
+			case 0:
+				csum = cpu_to_be16(crc_t10dif(daddr,
+						      scsi_debug_sector_size));
+				break;
+			default:
+				BUG();
+				ret = 0;
+				goto out;
+			}
+
+			if (sdt->guard_tag != csum) {
+				printk(KERN_ERR
+				       "%s: GUARD check failed on sector %lu " \
+				       "rcvd 0x%04x, calculated 0x%04x\n",
+				       __func__, (unsigned long)sector,
+				       be16_to_cpu(sdt->guard_tag),
+				       be16_to_cpu(csum));
+				ret = 0x01;
+				dump_sector(daddr, scsi_debug_sector_size);
+				goto out;
+			}
+
+			if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
+			    be32_to_cpu(sdt->ref_tag)
+			    != (start_sec & 0xffffffff)) {
+				printk(KERN_ERR
+				       "%s: REF check failed on sector %lu\n",
+				       __func__, (unsigned long)sector);
+				ret = 0x03;
+				dump_sector(daddr, scsi_debug_sector_size);
+				goto out;
+			}
+
+			if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
+			    be32_to_cpu(sdt->ref_tag) != ei_lba) {
+				printk(KERN_ERR
+				       "%s: REF check failed on sector %lu\n",
+				       __func__, (unsigned long)sector);
+				ret = 0x03;
+				dump_sector(daddr, scsi_debug_sector_size);
+				goto out;
+			}
+
+			/* Would be great to copy this in bigger
+			 * chunks.  However, for the sake of
+			 * correctness we need to verify each sector
+			 * before writing it to "stable" storage
+			 */
+			memcpy(dif_storep + dif_offset(sector), sdt, 8);
+
+			sector++;
+
+			if (sector == sdebug_store_sectors)
+				sector = 0;	/* Force wrap */
+
+			start_sec++;
+			ei_lba++;
+			daddr += scsi_debug_sector_size;
+			ppage_offset += sizeof(struct sd_dif_tuple);
+		}
+
+		kunmap_atomic(daddr);
+	}
+
+	kunmap_atomic(paddr);
+
+	dix_writes++;
+
+	return 0;
+
+out:
+	dif_errors++;
+	kunmap_atomic(daddr);
+	kunmap_atomic(paddr);
+	return ret;
+}
+
+static unsigned int map_state(sector_t lba, unsigned int *num)
+{
+	unsigned int granularity, alignment, mapped;
+	sector_t block, next, end;
+
+	granularity = scsi_debug_unmap_granularity;
+	alignment = granularity - scsi_debug_unmap_alignment;
+	block = lba + alignment;
+	do_div(block, granularity);
+
+	mapped = test_bit(block, map_storep);
+
+	if (mapped)
+		next = find_next_zero_bit(map_storep, map_size, block);
+	else
+		next = find_next_bit(map_storep, map_size, block);
+
+	end = next * granularity - scsi_debug_unmap_alignment;
+	*num = end - lba;
+
+	return mapped;
+}
+
+static void map_region(sector_t lba, unsigned int len)
+{
+	unsigned int granularity, alignment;
+	sector_t end = lba + len;
+
+	granularity = scsi_debug_unmap_granularity;
+	alignment = granularity - scsi_debug_unmap_alignment;
+
+	while (lba < end) {
+		sector_t block, rem;
+
+		block = lba + alignment;
+		rem = do_div(block, granularity);
+
+		if (block < map_size)
+			set_bit(block, map_storep);
+
+		lba += granularity - rem;
+	}
+}
+
+static void unmap_region(sector_t lba, unsigned int len)
+{
+	unsigned int granularity, alignment;
+	sector_t end = lba + len;
+
+	granularity = scsi_debug_unmap_granularity;
+	alignment = granularity - scsi_debug_unmap_alignment;
+
+	while (lba < end) {
+		sector_t block, rem;
+
+		block = lba + alignment;
+		rem = do_div(block, granularity);
+
+		if (rem == 0 && lba + granularity <= end && block < map_size) {
+			clear_bit(block, map_storep);
+			if (scsi_debug_lbprz)
+				memset(fake_storep +
+				       block * scsi_debug_sector_size, 0,
+				       scsi_debug_sector_size);
+		}
+		lba += granularity - rem;
+	}
+}
+
+static int resp_write(struct scsi_cmnd *SCpnt, unsigned long long lba,
+		      unsigned int num, struct sdebug_dev_info *devip,
+		      u32 ei_lba)
+{
+	unsigned long iflags;
+	int ret;
+
+	ret = check_device_access_params(devip, lba, num);
+	if (ret)
+		return ret;
+
+	/* DIX + T10 DIF */
+	if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
+		int prot_ret = prot_verify_write(SCpnt, lba, num, ei_lba);
+
+		if (prot_ret) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, prot_ret);
+			return illegal_condition_result;
+		}
+	}
+
+	write_lock_irqsave(&atomic_rw, iflags);
+	ret = do_device_access(SCpnt, devip, lba, num, 1);
+	if (scsi_debug_unmap_granularity)
+		map_region(lba, num);
+	write_unlock_irqrestore(&atomic_rw, iflags);
+	if (-1 == ret)
+		return (DID_ERROR << 16);
+	else if ((ret < (num * scsi_debug_sector_size)) &&
+		 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
+		printk(KERN_INFO "scsi_debug: write: cdb indicated=%u, "
+		       " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
+
+	return 0;
+}
+
+static int resp_write_same(struct scsi_cmnd *scmd, unsigned long long lba,
+		      unsigned int num, struct sdebug_dev_info *devip,
+			   u32 ei_lba, unsigned int unmap)
+{
+	unsigned long iflags;
+	unsigned long long i;
+	int ret;
+
+	ret = check_device_access_params(devip, lba, num);
+	if (ret)
+		return ret;
+
+	if (num > scsi_debug_write_same_length) {
+		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
+				0);
+		return check_condition_result;
+	}
+
+	write_lock_irqsave(&atomic_rw, iflags);
+
+	if (unmap && scsi_debug_unmap_granularity) {
+		unmap_region(lba, num);
+		goto out;
+	}
+
+	/* Else fetch one logical block */
+	ret = fetch_to_dev_buffer(scmd,
+				  fake_storep + (lba * scsi_debug_sector_size),
+				  scsi_debug_sector_size);
+
+	if (-1 == ret) {
+		write_unlock_irqrestore(&atomic_rw, iflags);
+		return (DID_ERROR << 16);
+	} else if ((ret < (num * scsi_debug_sector_size)) &&
+		 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
+		printk(KERN_INFO "scsi_debug: write same: cdb indicated=%u, "
+		       " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
+
+	/* Copy first sector to remaining blocks */
+	for (i = 1 ; i < num ; i++)
+		memcpy(fake_storep + ((lba + i) * scsi_debug_sector_size),
+		       fake_storep + (lba * scsi_debug_sector_size),
+		       scsi_debug_sector_size);
+
+	if (scsi_debug_unmap_granularity)
+		map_region(lba, num);
+out:
+	write_unlock_irqrestore(&atomic_rw, iflags);
+
+	return 0;
+}
+
+struct unmap_block_desc {
+	__be64	lba;
+	__be32	blocks;
+	__be32	__reserved;
+};
+
+static int resp_unmap(struct scsi_cmnd * scmd, struct sdebug_dev_info * devip)
+{
+	unsigned char *buf;
+	struct unmap_block_desc *desc;
+	unsigned int i, payload_len, descriptors;
+	int ret;
+
+	ret = check_readiness(scmd, 1, devip);
+	if (ret)
+		return ret;
+
+	payload_len = get_unaligned_be16(&scmd->cmnd[7]);
+	BUG_ON(scsi_bufflen(scmd) != payload_len);
+
+	descriptors = (payload_len - 8) / 16;
+
+	buf = kmalloc(scsi_bufflen(scmd), GFP_ATOMIC);
+	if (!buf)
+		return check_condition_result;
+
+	scsi_sg_copy_to_buffer(scmd, buf, scsi_bufflen(scmd));
+
+	BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2);
+	BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16);
+
+	desc = (void *)&buf[8];
+
+	for (i = 0 ; i < descriptors ; i++) {
+		unsigned long long lba = get_unaligned_be64(&desc[i].lba);
+		unsigned int num = get_unaligned_be32(&desc[i].blocks);
+
+		ret = check_device_access_params(devip, lba, num);
+		if (ret)
+			goto out;
+
+		unmap_region(lba, num);
+	}
+
+	ret = 0;
+
+out:
+	kfree(buf);
+
+	return ret;
+}
+
+#define SDEBUG_GET_LBA_STATUS_LEN 32
+
+static int resp_get_lba_status(struct scsi_cmnd * scmd,
+			       struct sdebug_dev_info * devip)
+{
+	unsigned long long lba;
+	unsigned int alloc_len, mapped, num;
+	unsigned char arr[SDEBUG_GET_LBA_STATUS_LEN];
+	int ret;
+
+	ret = check_readiness(scmd, 1, devip);
+	if (ret)
+		return ret;
+
+	lba = get_unaligned_be64(&scmd->cmnd[2]);
+	alloc_len = get_unaligned_be32(&scmd->cmnd[10]);
+
+	if (alloc_len < 24)
+		return 0;
+
+	ret = check_device_access_params(devip, lba, 1);
+	if (ret)
+		return ret;
+
+	mapped = map_state(lba, &num);
+
+	memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN);
+	put_unaligned_be32(20, &arr[0]);	/* Parameter Data Length */
+	put_unaligned_be64(lba, &arr[8]);	/* LBA */
+	put_unaligned_be32(num, &arr[16]);	/* Number of blocks */
+	arr[20] = !mapped;			/* mapped = 0, unmapped = 1 */
+
+	return fill_from_dev_buffer(scmd, arr, SDEBUG_GET_LBA_STATUS_LEN);
+}
+
+#define SDEBUG_RLUN_ARR_SZ 256
+
+static int resp_report_luns(struct scsi_cmnd * scp,
+			    struct sdebug_dev_info * devip)
+{
+	unsigned int alloc_len;
+	int lun_cnt, i, upper, num, n, wlun, lun;
+	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];
+	unsigned char * max_addr;
+
+	alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
+	if ((alloc_len < 4) || (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;
+	if (1 == select_report)
+		lun_cnt = 0;
+	else if (scsi_debug_no_lun_0 && (lun_cnt > 0))
+		--lun_cnt;
+	wlun = (select_report > 0) ? 1 : 0;
+	num = lun_cnt + wlun;
+	arr[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff;
+	arr[3] = (sizeof(struct scsi_lun) * num) & 0xff;
+	n = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
+			    sizeof(struct scsi_lun)), num);
+	if (n < num) {
+		wlun = 0;
+		lun_cnt = n;
+	}
+	one_lun = (struct scsi_lun *) &arr[8];
+	max_addr = arr + SDEBUG_RLUN_ARR_SZ;
+	for (i = 0, lun = (scsi_debug_no_lun_0 ? 1 : 0);
+             ((i < lun_cnt) && ((unsigned char *)(one_lun + i) < max_addr));
+	     i++, lun++) {
+		upper = (lun >> 8) & 0x3f;
+		if (upper)
+			one_lun[i].scsi_lun[0] =
+			    (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
+		one_lun[i].scsi_lun[1] = lun & 0xff;
+	}
+	if (wlun) {
+		one_lun[i].scsi_lun[0] = (SAM2_WLUN_REPORT_LUNS >> 8) & 0xff;
+		one_lun[i].scsi_lun[1] = SAM2_WLUN_REPORT_LUNS & 0xff;
+		i++;
+	}
+	alloc_len = (unsigned char *)(one_lun + i) - arr;
+	return fill_from_dev_buffer(scp, arr,
+				    min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
+}
+
+static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
+			    unsigned int num, struct sdebug_dev_info *devip)
+{
+	int i, j, ret = -1;
+	unsigned char *kaddr, *buf;
+	unsigned int offset;
+	struct scatterlist *sg;
+	struct scsi_data_buffer *sdb = scsi_in(scp);
+
+	/* better not to use temporary buffer. */
+	buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC);
+	if (!buf)
+		return ret;
+
+	scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
+
+	offset = 0;
+	for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
+		kaddr = (unsigned char *)kmap_atomic(sg_page(sg));
+		if (!kaddr)
+			goto out;
+
+		for (j = 0; j < sg->length; j++)
+			*(kaddr + sg->offset + j) ^= *(buf + offset + j);
+
+		offset += sg->length;
+		kunmap_atomic(kaddr);
+	}
+	ret = 0;
+out:
+	kfree(buf);
+
+	return ret;
+}
+
+/* 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_max_queue) {
+		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 struct sdebug_dev_info *
+sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags)
+{
+	struct sdebug_dev_info *devip;
+
+	devip = kzalloc(sizeof(*devip), flags);
+	if (devip) {
+		devip->sdbg_host = sdbg_host;
+		list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
+	}
+	return devip;
+}
+
+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 **)shost_priv(sdev->host);
+	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 (!open_devip) { /* try and make a new one */
+		open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC);
+		if (!open_devip) {
+			printk(KERN_ERR "%s: out of memory at line %d\n",
+				__func__, __LINE__);
+			return NULL;
+		}
+	}
+
+	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;
+	}
+	if (sdev->lun == SAM2_WLUN_REPORT_LUNS)
+		open_devip->wlun = SAM2_WLUN_REPORT_LUNS & 0xff;
+
+	return open_devip;
+}
+
+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);
+	queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
+	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);
+	if (NULL == devip)
+		return 1;	/* no resources, will be marked offline */
+	sdp->hostdata = devip;
+	if (sdp->host->cmd_per_lun)
+		scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
+					sdp->host->cmd_per_lun);
+	blk_queue_max_segment_size(sdp->request_queue, 256 * 1024);
+	if (scsi_debug_no_uld)
+		sdp->no_uld_attach = 1;
+	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 available for re-use */
+		devip->used = 0;
+		sdp->hostdata = NULL;
+	}
+}
+
+/* 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_max_queue; ++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_max_queue) ? 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_max_queue; ++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);
+}
+
+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 **)shost_priv(hp);
+		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;
+}
+
+/* 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_max_queue; ++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,
+				      unsigned long store_size)
+{
+	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) || (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_sectors;
+	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_max_queue; ++k) {
+			sqcp = &queued_arr[k];
+			if (! sqcp->in_use)
+				break;
+		}
+		if (k >= scsi_debug_max_queue) {
+			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;
+	}
+}
+/* Note: The following macros create attribute files in the
+   /sys/module/scsi_debug/parameters directory. Unfortunately this
+   driver is unaware of a change and cannot trigger auxiliary actions
+   as it can when the corresponding attribute in the
+   /sys/bus/pseudo/drivers/scsi_debug directory is changed.
+ */
+module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR);
+module_param_named(ato, scsi_debug_ato, int, S_IRUGO);
+module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR);
+module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO);
+module_param_named(dif, scsi_debug_dif, int, S_IRUGO);
+module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
+module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
+module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
+module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
+module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
+module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO);
+module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO);
+module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO);
+module_param_named(lbprz, scsi_debug_lbprz, int, S_IRUGO);
+module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
+module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR);
+module_param_named(max_queue, scsi_debug_max_queue, int, S_IRUGO | S_IWUSR);
+module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR);
+module_param_named(no_uld, scsi_debug_no_uld, int, S_IRUGO);
+module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO);
+module_param_named(num_tgts, scsi_debug_num_tgts, int, S_IRUGO | S_IWUSR);
+module_param_named(opt_blks, scsi_debug_opt_blks, int, S_IRUGO);
+module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR);
+module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
+module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);
+module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);
+module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO);
+module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO);
+module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO);
+module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
+module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO);
+module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR);
+module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int,
+		   S_IRUGO | S_IWUSR);
+module_param_named(write_same_length, scsi_debug_write_same_length, int,
+		   S_IRUGO | S_IWUSR);
+
+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(ato, "application tag ownership: 0=disk 1=host (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(def=8)");
+MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
+MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
+MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");
+MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)");
+MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");
+MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
+MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)");
+MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)");
+MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)");
+MODULE_PARM_DESC(lbprz, "unmapped blocks return 0 on read (def=1)");
+MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
+MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
+MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to 255(def))");
+MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
+MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
+MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
+MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
+MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
+MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
+MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
+MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
+MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
+MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
+MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
+MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
+MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
+MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)");
+MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");
+MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
+MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)");
+
+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\ndix_reads=%d dix_writes=%d dif_errors=%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,
+	    scsi_debug_sector_size, sdebug_cylinders_per, sdebug_heads,
+	    sdebug_sectors_per, num_aborts, num_dev_resets, num_bus_resets,
+	    num_host_resets, dix_reads, dix_writes, dif_errors);
+	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_fake_rw_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw);
+}
+static ssize_t sdebug_fake_rw_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_fake_rw = n;
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(fake_rw, S_IRUGO | S_IWUSR, sdebug_fake_rw_show,
+	    sdebug_fake_rw_store);
+
+static ssize_t sdebug_no_lun_0_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0);
+}
+static ssize_t sdebug_no_lun_0_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_no_lun_0 = n;
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(no_lun_0, S_IRUGO | S_IWUSR, sdebug_no_lun_0_show,
+	    sdebug_no_lun_0_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_max_queue_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_queue);
+}
+static ssize_t sdebug_max_queue_store(struct device_driver * ddp,
+				      const char * buf, size_t count)
+{
+        int n;
+
+	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) &&
+	    (n <= SCSI_DEBUG_CANQUEUE)) {
+		scsi_debug_max_queue = n;
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(max_queue, S_IRUGO | S_IWUSR, sdebug_max_queue_show,
+	    sdebug_max_queue_store);
+
+static ssize_t sdebug_no_uld_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_uld);
+}
+DRIVER_ATTR(no_uld, S_IRUGO, sdebug_no_uld_show, NULL);
+
+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_virtual_gb_show(struct device_driver * ddp, char * buf)
+{
+        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);
+}
+static ssize_t sdebug_virtual_gb_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_virtual_gb = n;
+
+		sdebug_capacity = get_sdebug_capacity();
+
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(virtual_gb, S_IRUGO | S_IWUSR, sdebug_virtual_gb_show,
+	    sdebug_virtual_gb_store);
+
+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;
+
+	if (sscanf(buf, "%d", &delta_hosts) != 1)
+		return -EINVAL;
+	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 ssize_t sdebug_vpd_use_hostno_show(struct device_driver * ddp,
+					  char * buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno);
+}
+static ssize_t sdebug_vpd_use_hostno_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_vpd_use_hostno = n;
+		return count;
+	}
+	return -EINVAL;
+}
+DRIVER_ATTR(vpd_use_hostno, S_IRUGO | S_IWUSR, sdebug_vpd_use_hostno_show,
+	    sdebug_vpd_use_hostno_store);
+
+static ssize_t sdebug_sector_size_show(struct device_driver * ddp, char * buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_sector_size);
+}
+DRIVER_ATTR(sector_size, S_IRUGO, sdebug_sector_size_show, NULL);
+
+static ssize_t sdebug_dix_show(struct device_driver *ddp, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dix);
+}
+DRIVER_ATTR(dix, S_IRUGO, sdebug_dix_show, NULL);
+
+static ssize_t sdebug_dif_show(struct device_driver *ddp, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dif);
+}
+DRIVER_ATTR(dif, S_IRUGO, sdebug_dif_show, NULL);
+
+static ssize_t sdebug_guard_show(struct device_driver *ddp, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_guard);
+}
+DRIVER_ATTR(guard, S_IRUGO, sdebug_guard_show, NULL);
+
+static ssize_t sdebug_ato_show(struct device_driver *ddp, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ato);
+}
+DRIVER_ATTR(ato, S_IRUGO, sdebug_ato_show, NULL);
+
+static ssize_t sdebug_map_show(struct device_driver *ddp, char *buf)
+{
+	ssize_t count;
+
+	if (!scsi_debug_lbp())
+		return scnprintf(buf, PAGE_SIZE, "0-%u\n",
+				 sdebug_store_sectors);
+
+	count = bitmap_scnlistprintf(buf, PAGE_SIZE, map_storep, map_size);
+
+	buf[count++] = '\n';
+	buf[count++] = 0;
+
+	return count;
+}
+DRIVER_ATTR(map, S_IRUGO, sdebug_map_show, NULL);
+
+
+/* Note: The following function creates attribute files in the
+   /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
+   files (over those found in the /sys/module/scsi_debug/parameters
+   directory) is that auxiliary actions can be triggered when an attribute
+   is changed. For example see: sdebug_add_host_store() above.
+ */
+static int do_create_driverfs_files(void)
+{
+	int ret;
+
+	ret = driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dix);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dif);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_guard);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ato);
+	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
+	return ret;
+}
+
+static void do_remove_driverfs_files(void)
+{
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ato);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_guard);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dif);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dix);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
+	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_tgts);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
+	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
+	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);
+}
+
+struct device *pseudo_primary;
+
+static int __init scsi_debug_init(void)
+{
+	unsigned long sz;
+	int host_to_add;
+	int k;
+	int ret;
+
+	switch (scsi_debug_sector_size) {
+	case  512:
+	case 1024:
+	case 2048:
+	case 4096:
+		break;
+	default:
+		printk(KERN_ERR "scsi_debug_init: invalid sector_size %d\n",
+		       scsi_debug_sector_size);
+		return -EINVAL;
+	}
+
+	switch (scsi_debug_dif) {
+
+	case SD_DIF_TYPE0_PROTECTION:
+	case SD_DIF_TYPE1_PROTECTION:
+	case SD_DIF_TYPE2_PROTECTION:
+	case SD_DIF_TYPE3_PROTECTION:
+		break;
+
+	default:
+		printk(KERN_ERR "scsi_debug_init: dif must be 0, 1, 2 or 3\n");
+		return -EINVAL;
+	}
+
+	if (scsi_debug_guard > 1) {
+		printk(KERN_ERR "scsi_debug_init: guard must be 0 or 1\n");
+		return -EINVAL;
+	}
+
+	if (scsi_debug_ato > 1) {
+		printk(KERN_ERR "scsi_debug_init: ato must be 0 or 1\n");
+		return -EINVAL;
+	}
+
+	if (scsi_debug_physblk_exp > 15) {
+		printk(KERN_ERR "scsi_debug_init: invalid physblk_exp %u\n",
+		       scsi_debug_physblk_exp);
+		return -EINVAL;
+	}
+
+	if (scsi_debug_lowest_aligned > 0x3fff) {
+		printk(KERN_ERR "scsi_debug_init: lowest_aligned too big: %u\n",
+		       scsi_debug_lowest_aligned);
+		return -EINVAL;
+	}
+
+	if (scsi_debug_dev_size_mb < 1)
+		scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
+	sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;
+	sdebug_store_sectors = sz / scsi_debug_sector_size;
+	sdebug_capacity = get_sdebug_capacity();
+
+	/* 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);
+	}
+
+	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, sz);
+
+	if (scsi_debug_dif) {
+		int dif_size;
+
+		dif_size = sdebug_store_sectors * sizeof(struct sd_dif_tuple);
+		dif_storep = vmalloc(dif_size);
+
+		printk(KERN_ERR "scsi_debug_init: dif_storep %u bytes @ %p\n",
+		       dif_size, dif_storep);
+
+		if (dif_storep == NULL) {
+			printk(KERN_ERR "scsi_debug_init: out of mem. (DIX)\n");
+			ret = -ENOMEM;
+			goto free_vm;
+		}
+
+		memset(dif_storep, 0xff, dif_size);
+	}
+
+	/* Logical Block Provisioning */
+	if (scsi_debug_lbp()) {
+		unsigned int map_bytes;
+
+		scsi_debug_unmap_max_blocks =
+			clamp(scsi_debug_unmap_max_blocks, 0U, 0xffffffffU);
+
+		scsi_debug_unmap_max_desc =
+			clamp(scsi_debug_unmap_max_desc, 0U, 256U);
+
+		scsi_debug_unmap_granularity =
+			clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU);
+
+		if (scsi_debug_unmap_alignment &&
+		    scsi_debug_unmap_granularity < scsi_debug_unmap_alignment) {
+			printk(KERN_ERR
+			       "%s: ERR: unmap_granularity < unmap_alignment\n",
+			       __func__);
+			return -EINVAL;
+		}
+
+		map_size = (sdebug_store_sectors / scsi_debug_unmap_granularity);
+		map_bytes = map_size >> 3;
+		map_storep = vmalloc(map_bytes);
+
+		printk(KERN_INFO "scsi_debug_init: %lu provisioning blocks\n",
+		       map_size);
+
+		if (map_storep == NULL) {
+			printk(KERN_ERR "scsi_debug_init: out of mem. (MAP)\n");
+			ret = -ENOMEM;
+			goto free_vm;
+		}
+
+		memset(map_storep, 0x0, map_bytes);
+
+		/* Map first 1KB for partition table */
+		if (scsi_debug_num_parts)
+			map_region(0, 2);
+	}
+
+	pseudo_primary = root_device_register("pseudo_0");
+	if (IS_ERR(pseudo_primary)) {
+		printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
+		ret = PTR_ERR(pseudo_primary);
+		goto free_vm;
+	}
+	ret = bus_register(&pseudo_lld_bus);
+	if (ret < 0) {
+		printk(KERN_WARNING "scsi_debug: bus_register error: %d\n",
+			ret);
+		goto dev_unreg;
+	}
+	ret = driver_register(&sdebug_driverfs_driver);
+	if (ret < 0) {
+		printk(KERN_WARNING "scsi_debug: driver_register error: %d\n",
+			ret);
+		goto bus_unreg;
+	}
+	ret = do_create_driverfs_files();
+	if (ret < 0) {
+		printk(KERN_WARNING "scsi_debug: driver_create_file error: %d\n",
+			ret);
+		goto del_files;
+	}
+
+	init_all_queued();
+
+	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;
+
+del_files:
+	do_remove_driverfs_files();
+	driver_unregister(&sdebug_driverfs_driver);
+bus_unreg:
+	bus_unregister(&pseudo_lld_bus);
+dev_unreg:
+	root_device_unregister(pseudo_primary);
+free_vm:
+	if (map_storep)
+		vfree(map_storep);
+	if (dif_storep)
+		vfree(dif_storep);
+	vfree(fake_storep);
+
+	return ret;
+}
+
+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);
+	root_device_unregister(pseudo_primary);
+
+	if (dif_storep)
+		vfree(dif_storep);
+
+	vfree(fake_storep);
+}
+
+device_initcall(scsi_debug_init);
+module_exit(scsi_debug_exit);
+
+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, *tmp;
+
+        sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
+        if (NULL == sdbg_host) {
+                printk(KERN_ERR "%s: out of memory at line %d\n",
+                       __func__, __LINE__);
+                return -ENOMEM;
+        }
+
+        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 = sdebug_device_create(sdbg_host, GFP_KERNEL);
+		if (!sdbg_devinfo) {
+                        printk(KERN_ERR "%s: out of memory at line %d\n",
+                               __func__, __LINE__);
+                        error = -ENOMEM;
+			goto clean;
+                }
+        }
+
+        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;
+        dev_set_name(&sdbg_host->dev, "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_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
+				 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 scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
+{
+	unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
+	int len, k;
+	unsigned int num;
+	unsigned long long lba;
+	u32 ei_lba;
+	int errsts = 0;
+	int target = SCpnt->device->id;
+	struct sdebug_dev_info *devip = NULL;
+	int inj_recovered = 0;
+	int inj_transport = 0;
+	int inj_dif = 0;
+	int inj_dix = 0;
+	int delay_override = 0;
+	int unmap = 0;
+
+	scsi_set_resid(SCpnt, 0);
+	if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
+		printk(KERN_INFO "scsi_debug: cmd ");
+		for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
+			printk("%02x ", (int)cmd[k]);
+		printk("\n");
+	}
+
+	if (target == SCpnt->device->host->hostt->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) &&
+	    (SCpnt->device->lun != SAM2_WLUN_REPORT_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_MAC_TIMEOUT & scsi_debug_opts &&
+			 scsi_medium_access_command(SCpnt))
+			return 0; /* time out reads and writes */
+		else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
+			inj_recovered = 1; /* to reads and writes below */
+		else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
+			inj_transport = 1; /* to reads and writes below */
+		else if (SCSI_DEBUG_OPT_DIF_ERR & scsi_debug_opts)
+			inj_dif = 1; /* to reads and writes below */
+		else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)
+			inj_dix = 1; /* to reads and writes below */
+	}
+
+	if (devip->wlun) {
+		switch (*cmd) {
+		case INQUIRY:
+		case REQUEST_SENSE:
+		case TEST_UNIT_READY:
+		case REPORT_LUNS:
+			break;  /* only allowable wlun commands */
+		default:
+			if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+				printk(KERN_INFO "scsi_debug: Opcode: 0x%x "
+				       "not supported for wlun\n", *cmd);
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_OPCODE, 0);
+			errsts = check_condition_result;
+			return schedule_resp(SCpnt, devip, done, errsts,
+					     0);
+		}
+	}
+
+	switch (*cmd) {
+	case INQUIRY:     /* mandatory, ignore unit attention */
+		delay_override = 1;
+		errsts = resp_inquiry(SCpnt, target, devip);
+		break;
+	case REQUEST_SENSE:	/* mandatory, ignore unit attention */
+		delay_override = 1;
+		errsts = resp_requests(SCpnt, devip);
+		break;
+	case REZERO_UNIT:	/* actually this is REWIND for SSC */
+	case START_STOP:
+		errsts = resp_start_stop(SCpnt, devip);
+		break;
+	case ALLOW_MEDIUM_REMOVAL:
+		errsts = check_readiness(SCpnt, 1, devip);
+		if (errsts)
+			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_readiness(SCpnt, 1, devip);
+		break;
+	case TEST_UNIT_READY:     /* mandatory */
+		delay_override = 1;
+		errsts = check_readiness(SCpnt, 0, devip);
+		break;
+	case RESERVE:
+		errsts = check_readiness(SCpnt, 1, devip);
+		break;
+	case RESERVE_10:
+		errsts = check_readiness(SCpnt, 1, devip);
+		break;
+	case RELEASE:
+		errsts = check_readiness(SCpnt, 1, devip);
+		break;
+	case RELEASE_10:
+		errsts = check_readiness(SCpnt, 1, devip);
+		break;
+	case READ_CAPACITY:
+		errsts = resp_readcap(SCpnt, devip);
+		break;
+	case SERVICE_ACTION_IN:
+		if (cmd[1] == SAI_READ_CAPACITY_16)
+			errsts = resp_readcap16(SCpnt, devip);
+		else if (cmd[1] == SAI_GET_LBA_STATUS) {
+
+			if (scsi_debug_lbp() == 0) {
+				mk_sense_buffer(devip, ILLEGAL_REQUEST,
+						INVALID_COMMAND_OPCODE, 0);
+				errsts = check_condition_result;
+			} else
+				errsts = resp_get_lba_status(SCpnt, devip);
+		} else {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_OPCODE, 0);
+			errsts = check_condition_result;
+		}
+		break;
+	case MAINTENANCE_IN:
+		if (MI_REPORT_TARGET_PGS != cmd[1]) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_OPCODE, 0);
+			errsts = check_condition_result;
+			break;
+		}
+		errsts = resp_report_tgtpgs(SCpnt, devip);
+		break;
+	case READ_16:
+	case READ_12:
+	case READ_10:
+		/* READ{10,12,16} and DIF Type 2 are natural enemies */
+		if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
+		    cmd[1] & 0xe0) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_COMMAND_OPCODE, 0);
+			errsts = check_condition_result;
+			break;
+		}
+
+		if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
+		     scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
+		    (cmd[1] & 0xe0) == 0)
+			printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
+
+		/* fall through */
+	case READ_6:
+read:
+		errsts = check_readiness(SCpnt, 0, devip);
+		if (errsts)
+			break;
+		if (scsi_debug_fake_rw)
+			break;
+		get_data_transfer_info(cmd, &lba, &num, &ei_lba);
+		errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
+		if (inj_recovered && (0 == errsts)) {
+			mk_sense_buffer(devip, RECOVERED_ERROR,
+					THRESHOLD_EXCEEDED, 0);
+			errsts = check_condition_result;
+		} else if (inj_transport && (0 == errsts)) {
+			mk_sense_buffer(devip, ABORTED_COMMAND,
+					TRANSPORT_PROBLEM, ACK_NAK_TO);
+			errsts = check_condition_result;
+		} else if (inj_dif && (0 == errsts)) {
+			mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
+			errsts = illegal_condition_result;
+		} else if (inj_dix && (0 == errsts)) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
+			errsts = illegal_condition_result;
+		}
+		break;
+	case REPORT_LUNS:	/* mandatory, ignore unit attention */
+		delay_override = 1;
+		errsts = resp_report_luns(SCpnt, devip);
+		break;
+	case VERIFY:		/* 10 byte SBC-2 command */
+		errsts = check_readiness(SCpnt, 0, devip);
+		break;
+	case WRITE_16:
+	case WRITE_12:
+	case WRITE_10:
+		/* WRITE{10,12,16} and DIF Type 2 are natural enemies */
+		if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
+		    cmd[1] & 0xe0) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_COMMAND_OPCODE, 0);
+			errsts = check_condition_result;
+			break;
+		}
+
+		if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
+		     scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
+		    (cmd[1] & 0xe0) == 0)
+			printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
+
+		/* fall through */
+	case WRITE_6:
+write:
+		errsts = check_readiness(SCpnt, 0, devip);
+		if (errsts)
+			break;
+		if (scsi_debug_fake_rw)
+			break;
+		get_data_transfer_info(cmd, &lba, &num, &ei_lba);
+		errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
+		if (inj_recovered && (0 == errsts)) {
+			mk_sense_buffer(devip, RECOVERED_ERROR,
+					THRESHOLD_EXCEEDED, 0);
+			errsts = check_condition_result;
+		} else if (inj_dif && (0 == errsts)) {
+			mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
+			errsts = illegal_condition_result;
+		} else if (inj_dix && (0 == errsts)) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
+			errsts = illegal_condition_result;
+		}
+		break;
+	case WRITE_SAME_16:
+	case WRITE_SAME:
+		if (cmd[1] & 0x8) {
+			if ((*cmd == WRITE_SAME_16 && scsi_debug_lbpws == 0) ||
+			    (*cmd == WRITE_SAME && scsi_debug_lbpws10 == 0)) {
+				mk_sense_buffer(devip, ILLEGAL_REQUEST,
+						INVALID_FIELD_IN_CDB, 0);
+				errsts = check_condition_result;
+			} else
+				unmap = 1;
+		}
+		if (errsts)
+			break;
+		errsts = check_readiness(SCpnt, 0, devip);
+		if (errsts)
+			break;
+		get_data_transfer_info(cmd, &lba, &num, &ei_lba);
+		errsts = resp_write_same(SCpnt, lba, num, devip, ei_lba, unmap);
+		break;
+	case UNMAP:
+		errsts = check_readiness(SCpnt, 0, devip);
+		if (errsts)
+			break;
+
+		if (scsi_debug_unmap_max_desc == 0 || scsi_debug_lbpu == 0) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_COMMAND_OPCODE, 0);
+			errsts = check_condition_result;
+		} else
+			errsts = resp_unmap(SCpnt, devip);
+		break;
+	case MODE_SENSE:
+	case MODE_SENSE_10:
+		errsts = resp_mode_sense(SCpnt, target, devip);
+		break;
+	case MODE_SELECT:
+		errsts = resp_mode_select(SCpnt, 1, devip);
+		break;
+	case MODE_SELECT_10:
+		errsts = resp_mode_select(SCpnt, 0, devip);
+		break;
+	case LOG_SENSE:
+		errsts = resp_log_sense(SCpnt, devip);
+		break;
+	case SYNCHRONIZE_CACHE:
+		delay_override = 1;
+		errsts = check_readiness(SCpnt, 0, devip);
+		break;
+	case WRITE_BUFFER:
+		errsts = check_readiness(SCpnt, 1, devip);
+		break;
+	case XDWRITEREAD_10:
+		if (!scsi_bidi_cmnd(SCpnt)) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_FIELD_IN_CDB, 0);
+			errsts = check_condition_result;
+			break;
+		}
+
+		errsts = check_readiness(SCpnt, 0, devip);
+		if (errsts)
+			break;
+		if (scsi_debug_fake_rw)
+			break;
+		get_data_transfer_info(cmd, &lba, &num, &ei_lba);
+		errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
+		if (errsts)
+			break;
+		errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
+		if (errsts)
+			break;
+		errsts = resp_xdwriteread(SCpnt, lba, num, devip);
+		break;
+	case VARIABLE_LENGTH_CMD:
+		if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION) {
+
+			if ((cmd[10] & 0xe0) == 0)
+				printk(KERN_ERR
+				       "Unprotected RD/WR to DIF device\n");
+
+			if (cmd[9] == READ_32) {
+				BUG_ON(SCpnt->cmd_len < 32);
+				goto read;
+			}
+
+			if (cmd[9] == WRITE_32) {
+				BUG_ON(SCpnt->cmd_len < 32);
+				goto write;
+			}
+		}
+
+		mk_sense_buffer(devip, ILLEGAL_REQUEST,
+				INVALID_FIELD_IN_CDB, 0);
+		errsts = check_condition_result;
+		break;
+
+	default:
+		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+			printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
+			       "supported\n", *cmd);
+		errsts = check_readiness(SCpnt, 1, devip);
+		if (errsts)
+			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,
+			     (delay_override ? 0 : scsi_debug_delay));
+}
+
+static DEF_SCSI_QCMD(scsi_debug_queuecommand)
+
+static struct scsi_host_template sdebug_driver_template = {
+	.proc_info =		scsi_debug_proc_info,
+	.proc_name =		sdebug_proc_name,
+	.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 =		256,
+	.cmd_per_lun =		16,
+	.max_sectors =		0xffff,
+	.use_clustering = 	DISABLE_CLUSTERING,
+	.module =		THIS_MODULE,
+};
+
+static int sdebug_driver_probe(struct device * dev)
+{
+        int error = 0;
+        struct sdebug_host_info *sdbg_host;
+        struct Scsi_Host *hpnt;
+	int host_prot;
+
+	sdbg_host = to_sdebug_host(dev);
+
+	sdebug_driver_template.can_queue = scsi_debug_max_queue;
+	hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
+	if (NULL == hpnt) {
+		printk(KERN_ERR "%s: scsi_register failed\n", __func__);
+		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 = SAM2_WLUN_REPORT_LUNS;	/* = scsi_debug_max_luns; */
+
+	host_prot = 0;
+
+	switch (scsi_debug_dif) {
+
+	case SD_DIF_TYPE1_PROTECTION:
+		host_prot = SHOST_DIF_TYPE1_PROTECTION;
+		if (scsi_debug_dix)
+			host_prot |= SHOST_DIX_TYPE1_PROTECTION;
+		break;
+
+	case SD_DIF_TYPE2_PROTECTION:
+		host_prot = SHOST_DIF_TYPE2_PROTECTION;
+		if (scsi_debug_dix)
+			host_prot |= SHOST_DIX_TYPE2_PROTECTION;
+		break;
+
+	case SD_DIF_TYPE3_PROTECTION:
+		host_prot = SHOST_DIF_TYPE3_PROTECTION;
+		if (scsi_debug_dix)
+			host_prot |= SHOST_DIX_TYPE3_PROTECTION;
+		break;
+
+	default:
+		if (scsi_debug_dix)
+			host_prot |= SHOST_DIX_TYPE0_PROTECTION;
+		break;
+	}
+
+	scsi_host_set_prot(hpnt, host_prot);
+
+	printk(KERN_INFO "scsi_debug: host protection%s%s%s%s%s%s%s\n",
+	       (host_prot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "",
+	       (host_prot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "",
+	       (host_prot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "",
+	       (host_prot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "",
+	       (host_prot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "",
+	       (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
+	       (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
+
+	if (scsi_debug_guard == 1)
+		scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
+	else
+		scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
+
+        error = scsi_add_host(hpnt, &sdbg_host->dev);
+        if (error) {
+                printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
+                error = -ENODEV;
+		scsi_host_put(hpnt);
+        } else
+		scsi_scan_host(hpnt);
+
+
+        return error;
+}
+
+static int sdebug_driver_remove(struct device * dev)
+{
+        struct sdebug_host_info *sdbg_host;
+	struct sdebug_dev_info *sdbg_devinfo, *tmp;
+
+	sdbg_host = to_sdebug_host(dev);
+
+	if (!sdbg_host) {
+		printk(KERN_ERR "%s: Unable to locate host info\n",
+		       __func__);
+		return -ENODEV;
+	}
+
+        scsi_remove_host(sdbg_host->shost);
+
+	list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
+				 dev_list) {
+                list_del(&sdbg_devinfo->dev_list);
+                kfree(sdbg_devinfo);
+        }
+
+        scsi_host_put(sdbg_host->shost);
+        return 0;
+}
+
+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,
+	.probe = sdebug_driver_probe,
+	.remove = sdebug_driver_remove,
+};