X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fscsi%2Fscsi_debug.c;h=f6600bfb5bde71ffc244260ec6aa1aec4cf59469;hb=b8a0b6ccf2ba2519ace65d782b41ee91bf3c3778;hp=161af1ded8880400855ee341ec4fbc225c95b2df;hpb=5cb2fc06107fe343a9488b32ddf3d9b4596b7090;p=linux-2.6

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 161af1ded8..f6600bfb5b 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -46,6 +46,7 @@
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsicam.h>
+#include <scsi/scsi_eh.h>
 
 #include <linux/stat.h>
 
@@ -147,7 +148,6 @@ static int scsi_debug_cmnd_count = 0;
 #define DEV_READONLY(TGT)      (0)
 #define DEV_REMOVEABLE(TGT)    (0)
 
-static unsigned int sdebug_store_size;	/* in bytes */
 static unsigned int sdebug_store_sectors;
 static sector_t sdebug_capacity;	/* in sectors */
 
@@ -218,8 +218,6 @@ static DEFINE_RWLOCK(atomic_rw);
 
 static char sdebug_proc_name[] = "scsi_debug";
 
-static int sdebug_driver_probe(struct device *);
-static int sdebug_driver_remove(struct device *);
 static struct bus_type pseudo_lld_bus;
 
 static struct device_driver sdebug_driverfs_driver = {
@@ -235,94 +233,77 @@ static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
 static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
 			           0, 0, 0x0, 0x0};
 
-/* function declarations */
-static int resp_inquiry(struct scsi_cmnd * SCpnt, int target,
-			struct sdebug_dev_info * devip);
-static int resp_requests(struct scsi_cmnd * SCpnt,
-			 struct sdebug_dev_info * devip);
-static int resp_start_stop(struct scsi_cmnd * scp,
-			   struct sdebug_dev_info * devip);
-static int resp_report_tgtpgs(struct scsi_cmnd * scp,
-			      struct sdebug_dev_info * devip);
-static int resp_readcap(struct scsi_cmnd * SCpnt,
-			struct sdebug_dev_info * devip);
-static int resp_readcap16(struct scsi_cmnd * SCpnt,
-			  struct sdebug_dev_info * devip);
-static int resp_mode_sense(struct scsi_cmnd * scp, int target,
-			   struct sdebug_dev_info * devip);
-static int resp_mode_select(struct scsi_cmnd * scp, int mselect6,
-			    struct sdebug_dev_info * devip);
-static int resp_log_sense(struct scsi_cmnd * scp,
-			  struct sdebug_dev_info * devip);
-static int resp_read(struct scsi_cmnd * SCpnt, unsigned long long lba,
-		     unsigned int num, struct sdebug_dev_info * devip);
-static int resp_write(struct scsi_cmnd * SCpnt, unsigned long long lba,
-		      unsigned int num, struct sdebug_dev_info * devip);
-static int resp_report_luns(struct scsi_cmnd * SCpnt,
-			    struct sdebug_dev_info * devip);
-static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
-			    unsigned int num, struct sdebug_dev_info *devip);
-static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
-                                int arr_len);
-static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
-                               int max_arr_len);
-static void timer_intr_handler(unsigned long);
-static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev);
-static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
-			    int asc, int asq);
-static int check_readiness(struct scsi_cmnd * SCpnt, int reset_only,
-			   struct sdebug_dev_info * devip);
-static int schedule_resp(struct scsi_cmnd * cmnd,
-			 struct sdebug_dev_info * devip,
-			 done_funct_t done, int scsi_result, int delta_jiff);
-static void __init sdebug_build_parts(unsigned char * ramp);
-static void __init init_all_queued(void);
-static void stop_all_queued(void);
-static int stop_queued_cmnd(struct scsi_cmnd * cmnd);
-static int inquiry_evpd_83(unsigned char * arr, int port_group_id,
-			   int target_dev_id, int dev_id_num,
-			   const char * dev_id_str, int dev_id_str_len);
-static int inquiry_evpd_88(unsigned char * arr, int target_dev_id);
-static int do_create_driverfs_files(void);
-static void do_remove_driverfs_files(void);
-
 static int sdebug_add_adapter(void);
 static void sdebug_remove_adapter(void);
-static void sdebug_max_tgts_luns(void);
 
-static struct device pseudo_primary;
-static struct bus_type pseudo_lld_bus;
+static 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)
 {
-	int i;
-
 	switch (*cmd) {
 	case WRITE_16:
 	case READ_16:
-		for (*lba = 0, i = 0; i < 8; ++i) {
-			if (i > 0)
-				*lba <<= 8;
-			*lba += cmd[2 + i];
-		}
-		*num = cmd[13] + (cmd[12] << 8) +
-			(cmd[11] << 16) + (cmd[10] << 24);
+		*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 = cmd[5] + (cmd[4] << 8) +	(cmd[3] << 16) + (cmd[2] << 24);
-		*num = cmd[9] + (cmd[8] << 8) +	(cmd[7] << 16) + (cmd[6] << 24);
+		*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_10:
 	case READ_10:
 	case XDWRITEREAD_10:
-		*lba = cmd[5] + (cmd[4] << 8) +	(cmd[3] << 16) + (cmd[2] << 24);
-		*num = cmd[8] + (cmd[7] << 8);
+		*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 = cmd[3] + (cmd[2] << 8) + ((cmd[1] & 0x1f) << 16);
+		*lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
+			(u32)(cmd[1] & 0x1f) << 16;
 		*num = (0 == cmd[4]) ? 256 : cmd[4];
 		break;
 	default:
@@ -330,235 +311,6 @@ static void get_data_transfer_info(unsigned char *cmd,
 	}
 }
 
-static
-int scsi_debug_queuecommand(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;
-	int errsts = 0;
-	int target = SCpnt->device->id;
-	struct sdebug_dev_info * devip = NULL;
-	int inj_recovered = 0;
-	int inj_transport = 0;
-	int delay_override = 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_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 */
-        }
-
-	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:
-		if ((errsts = check_readiness(SCpnt, 1, devip)))
-			break;
-		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
-			printk(KERN_INFO "scsi_debug: Medium removal %s\n",
-			        cmd[4] ? "inhibited" : "enabled");
-		break;
-	case SEND_DIAGNOSTIC:     /* mandatory */
-		errsts = check_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 (SAI_READ_CAPACITY_16 != cmd[1]) {
-			mk_sense_buffer(devip, ILLEGAL_REQUEST,
-					INVALID_OPCODE, 0);
-			errsts = check_condition_result;
-			break;
-		}
-		errsts = resp_readcap16(SCpnt, devip);
-		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:
-	case READ_6:
-		if ((errsts = check_readiness(SCpnt, 0, devip)))
-			break;
-		if (scsi_debug_fake_rw)
-			break;
-		get_data_transfer_info(cmd, &lba, &num);
-		errsts = resp_read(SCpnt, lba, num, devip);
-		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;
-                }
-		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:
-	case WRITE_6:
-		if ((errsts = check_readiness(SCpnt, 0, devip)))
-			break;
-		if (scsi_debug_fake_rw)
-			break;
-		get_data_transfer_info(cmd, &lba, &num);
-		errsts = resp_write(SCpnt, lba, num, devip);
-		if (inj_recovered && (0 == errsts)) {
-			mk_sense_buffer(devip, RECOVERED_ERROR,
-					THRESHOLD_EXCEEDED, 0);
-			errsts = check_condition_result;
-		}
-		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);
-		errsts = resp_read(SCpnt, lba, num, devip);
-		if (errsts)
-			break;
-		errsts = resp_write(SCpnt, lba, num, devip);
-		if (errsts)
-			break;
-		errsts = resp_xdwriteread(SCpnt, lba, num, devip);
-		break;
-	default:
-		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
-			printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
-			       "supported\n", *cmd);
-		if ((errsts = check_readiness(SCpnt, 1, devip)))
-			break;	/* Unit attention takes precedence */
-		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
-		errsts = check_condition_result;
-		break;
-	}
-	return schedule_resp(SCpnt, devip, done, errsts,
-			     (delay_override ? 0 : scsi_debug_delay));
-}
-
 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
 {
 	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
@@ -1093,6 +845,14 @@ static int resp_start_stop(struct scsi_cmnd * scp,
 	return 0;
 }
 
+static sector_t get_sdebug_capacity(void)
+{
+	if (scsi_debug_virtual_gb > 0)
+		return 2048 * 1024 * scsi_debug_virtual_gb;
+	else
+		return sdebug_store_sectors;
+}
+
 #define SDEBUG_READCAP_ARR_SZ 8
 static int resp_readcap(struct scsi_cmnd * scp,
 			struct sdebug_dev_info * devip)
@@ -1104,11 +864,7 @@ static int resp_readcap(struct scsi_cmnd * scp,
 	if ((errsts = check_readiness(scp, 1, devip)))
 		return errsts;
 	/* following just in case virtual_gb changed */
-	if (scsi_debug_virtual_gb > 0) {
-		sdebug_capacity = 2048 * 1024;
-		sdebug_capacity *= scsi_debug_virtual_gb;
-	} else
-		sdebug_capacity = sdebug_store_sectors;
+	sdebug_capacity = get_sdebug_capacity();
 	memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
 	if (sdebug_capacity < 0xffffffff) {
 		capac = (unsigned int)sdebug_capacity - 1;
@@ -1141,11 +897,7 @@ static int resp_readcap16(struct scsi_cmnd * scp,
 	alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8)
 		     + cmd[13]);
 	/* following just in case virtual_gb changed */
-	if (scsi_debug_virtual_gb > 0) {
-		sdebug_capacity = 2048 * 1024;
-		sdebug_capacity *= scsi_debug_virtual_gb;
-	} else
-		sdebug_capacity = sdebug_store_sectors;
+	sdebug_capacity = get_sdebug_capacity();
 	memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
 	capac = sdebug_capacity - 1;
 	for (k = 0; k < 8; ++k, capac >>= 8)
@@ -1439,13 +1191,9 @@ static int resp_mode_sense(struct scsi_cmnd * scp, int target,
 		offset = 8;
 	}
 	ap = arr + offset;
-	if ((bd_len > 0) && (0 == sdebug_capacity)) {
-		if (scsi_debug_virtual_gb > 0) {
-			sdebug_capacity = 2048 * 1024;
-			sdebug_capacity *= scsi_debug_virtual_gb;
-		} else
-			sdebug_capacity = sdebug_store_sectors;
-	}
+	if ((bd_len > 0) && (!sdebug_capacity))
+		sdebug_capacity = get_sdebug_capacity();
+
 	if (8 == bd_len) {
 		if (sdebug_capacity > 0xfffffffe) {
 			ap[0] = 0xff;
@@ -1742,25 +1490,53 @@ static int resp_log_sense(struct scsi_cmnd * scp,
 		    min(len, SDEBUG_MAX_INQ_ARR_SZ));
 }
 
-static int resp_read(struct scsi_cmnd * SCpnt, unsigned long long lba,
-		     unsigned int num, struct sdebug_dev_info * devip)
+static int check_device_access_params(struct sdebug_dev_info *devi,
+				      unsigned long long lba, unsigned int num)
 {
-	unsigned long iflags;
-	unsigned int block, from_bottom;
-	unsigned long long u;
-	int ret;
-
 	if (lba + num > sdebug_capacity) {
-		mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
-				0);
+		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(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
-				0);
+		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 int 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 * SECT_SIZE),
+		   (num - rest) * SECT_SIZE);
+	if (!ret && rest)
+		ret = func(scmd, fake_storep, rest * SECT_SIZE);
+
+	return ret;
+}
+
+static int resp_read(struct scsi_cmnd *SCpnt, unsigned long long lba,
+		     unsigned int num, struct sdebug_dev_info *devip)
+{
+	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) &&
 	    ((lba + num) > OPT_MEDIUM_ERR_ADDR)) {
@@ -1779,74 +1555,30 @@ static int resp_read(struct scsi_cmnd * SCpnt, unsigned long long lba,
 		return check_condition_result;
 	}
 	read_lock_irqsave(&atomic_rw, iflags);
-	if ((lba + num) <= sdebug_store_sectors)
-		ret = fill_from_dev_buffer(SCpnt,
-					   fake_storep + (lba * SECT_SIZE),
-			   		   num * SECT_SIZE);
-	else {
-		/* modulo when one arg is 64 bits needs do_div() */
-		u = lba;
-		block = do_div(u, sdebug_store_sectors);
-		from_bottom = 0;
-		if ((block + num) > sdebug_store_sectors)
-			from_bottom = (block + num) - sdebug_store_sectors;
-		ret = fill_from_dev_buffer(SCpnt,
-					   fake_storep + (block * SECT_SIZE),
-			   		   (num - from_bottom) * SECT_SIZE);
-		if ((0 == ret) && (from_bottom > 0))
-			ret = fill_from_dev_buffer(SCpnt, fake_storep,
-						   from_bottom * SECT_SIZE);
-	}
+	ret = do_device_access(SCpnt, devip, lba, num, 0);
 	read_unlock_irqrestore(&atomic_rw, iflags);
 	return ret;
 }
 
-static int resp_write(struct scsi_cmnd * SCpnt, unsigned long long lba,
-		      unsigned int num, struct sdebug_dev_info * devip)
+static int resp_write(struct scsi_cmnd *SCpnt, unsigned long long lba,
+		      unsigned int num, struct sdebug_dev_info *devip)
 {
 	unsigned long iflags;
-	unsigned int block, to_bottom;
-	unsigned long long u;
-	int res;
+	int ret;
 
-	if (lba + num > sdebug_capacity) {
-		mk_sense_buffer(devip, 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(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
-				0);
-		return check_condition_result;
-	}
+	ret = check_device_access_params(devip, lba, num);
+	if (ret)
+		return ret;
 
 	write_lock_irqsave(&atomic_rw, iflags);
-	if ((lba + num) <= sdebug_store_sectors)
-		res = fetch_to_dev_buffer(SCpnt,
-					  fake_storep + (lba * SECT_SIZE),
-			   		  num * SECT_SIZE);
-	else {
-		/* modulo when one arg is 64 bits needs do_div() */
-		u = lba;
-		block = do_div(u, sdebug_store_sectors);
-		to_bottom = 0;
-		if ((block + num) > sdebug_store_sectors)
-			to_bottom = (block + num) - sdebug_store_sectors;
-		res = fetch_to_dev_buffer(SCpnt,
-					  fake_storep + (block * SECT_SIZE),
-			   		  (num - to_bottom) * SECT_SIZE);
-		if ((0 == res) && (to_bottom > 0))
-			res = fetch_to_dev_buffer(SCpnt, fake_storep,
-						  to_bottom * SECT_SIZE);
-	}
+	ret = do_device_access(SCpnt, devip, lba, num, 1);
 	write_unlock_irqrestore(&atomic_rw, iflags);
-	if (-1 == res)
+	if (-1 == ret)
 		return (DID_ERROR << 16);
-	else if ((res < (num * SECT_SIZE)) &&
+	else if ((ret < (num * SECT_SIZE)) &&
 		 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
 		printk(KERN_INFO "scsi_debug: write: cdb indicated=%u, "
-		       " IO sent=%d bytes\n", num * SECT_SIZE, res);
+		       " IO sent=%d bytes\n", num * SECT_SIZE, ret);
 	return 0;
 }
 
@@ -1970,52 +1702,9 @@ static void timer_intr_handler(unsigned long indx)
 	spin_unlock_irqrestore(&queued_arr_lock, iflags);
 }
 
-static int scsi_debug_slave_alloc(struct scsi_device * sdp)
-{
-	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
-		printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
-		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
-	set_bit(QUEUE_FLAG_BIDI, &sdp->request_queue->queue_flags);
-	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);
-	return 0;
-}
-
-static void scsi_debug_slave_destroy(struct scsi_device * sdp)
-{
-	struct sdebug_dev_info * devip =
-				(struct sdebug_dev_info *)sdp->hostdata;
-
-	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
-		printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
-		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
-	if (devip) {
-		/* make this slot avaliable for re-use */
-		devip->used = 0;
-		sdp->hostdata = NULL;
-	}
-}
-
-struct sdebug_dev_info *sdebug_device_create(struct sdebug_host_info *sdbg_host,
-					     gfp_t flags)
+static struct sdebug_dev_info *
+sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags)
 {
 	struct sdebug_dev_info *devip;
 
@@ -2059,49 +1748,108 @@ static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
 			return NULL;
 		}
 	}
-        if (open_devip) {
-		open_devip->channel = sdev->channel;
-		open_devip->target = sdev->id;
-		open_devip->lun = sdev->lun;
-		open_devip->sdbg_host = sdbg_host;
-		open_devip->reset = 1;
-		open_devip->used = 1;
-		memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
-		if (scsi_debug_dsense)
-			open_devip->sense_buff[0] = 0x72;
-		else {
-			open_devip->sense_buff[0] = 0x70;
-			open_devip->sense_buff[7] = 0xa;
+
+	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);
+	return 0;
+}
+
+static void scsi_debug_slave_destroy(struct scsi_device *sdp)
+{
+	struct sdebug_dev_info *devip =
+		(struct sdebug_dev_info *)sdp->hostdata;
+
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
+		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
+	if (devip) {
+		/* make this slot avaliable for re-use */
+		devip->used = 0;
+		sdp->hostdata = NULL;
+	}
+}
+
+/* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
+static int stop_queued_cmnd(struct scsi_cmnd *cmnd)
+{
+	unsigned long iflags;
+	int k;
+	struct sdebug_queued_cmd *sqcp;
+
+	spin_lock_irqsave(&queued_arr_lock, iflags);
+	for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
+		sqcp = &queued_arr[k];
+		if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
+			del_timer_sync(&sqcp->cmnd_timer);
+			sqcp->in_use = 0;
+			sqcp->a_cmnd = NULL;
+			break;
 		}
-		if (sdev->lun == SAM2_WLUN_REPORT_LUNS)
-			open_devip->wlun = SAM2_WLUN_REPORT_LUNS & 0xff;
-		return open_devip;
-        }
-        return NULL;
+	}
+	spin_unlock_irqrestore(&queued_arr_lock, iflags);
+	return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
 }
 
-static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
-			    int asc, int asq)
+/* Deletes (stops) timers of all queued commands */
+static void stop_all_queued(void)
 {
-	unsigned char * sbuff;
+	unsigned long iflags;
+	int k;
+	struct sdebug_queued_cmd *sqcp;
 
-	sbuff = devip->sense_buff;
-	memset(sbuff, 0, SDEBUG_SENSE_LEN);
-	if (scsi_debug_dsense) {
-		sbuff[0] = 0x72;  /* descriptor, current */
-		sbuff[1] = key;
-		sbuff[2] = asc;
-		sbuff[3] = asq;
-	} else {
-		sbuff[0] = 0x70;  /* fixed, current */
-		sbuff[2] = key;
-		sbuff[7] = 0xa;	  /* implies 18 byte sense buffer */
-		sbuff[12] = asc;
-		sbuff[13] = asq;
+	spin_lock_irqsave(&queued_arr_lock, iflags);
+	for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
+		sqcp = &queued_arr[k];
+		if (sqcp->in_use && sqcp->a_cmnd) {
+			del_timer_sync(&sqcp->cmnd_timer);
+			sqcp->in_use = 0;
+			sqcp->a_cmnd = NULL;
+		}
 	}
-	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);
+	spin_unlock_irqrestore(&queued_arr_lock, iflags);
 }
 
 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
@@ -2191,46 +1939,6 @@ static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
 	return SUCCESS;
 }
 
-/* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
-static int stop_queued_cmnd(struct scsi_cmnd * cmnd)
-{
-	unsigned long iflags;
-	int k;
-	struct sdebug_queued_cmd * sqcp;
-
-	spin_lock_irqsave(&queued_arr_lock, iflags);
-	for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
-		sqcp = &queued_arr[k];
-		if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
-			del_timer_sync(&sqcp->cmnd_timer);
-			sqcp->in_use = 0;
-			sqcp->a_cmnd = NULL;
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&queued_arr_lock, iflags);
-	return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
-}
-
-/* Deletes (stops) timers of all queued commands */
-static void stop_all_queued(void)
-{
-	unsigned long iflags;
-	int k;
-	struct sdebug_queued_cmd * sqcp;
-
-	spin_lock_irqsave(&queued_arr_lock, iflags);
-	for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
-		sqcp = &queued_arr[k];
-		if (sqcp->in_use && sqcp->a_cmnd) {
-			del_timer_sync(&sqcp->cmnd_timer);
-			sqcp->in_use = 0;
-			sqcp->a_cmnd = NULL;
-		}
-	}
-	spin_unlock_irqrestore(&queued_arr_lock, iflags);
-}
-
 /* Initializes timers in queued array */
 static void __init init_all_queued(void)
 {
@@ -2248,7 +1956,8 @@ static void __init init_all_queued(void)
 	spin_unlock_irqrestore(&queued_arr_lock, iflags);
 }
 
-static void __init sdebug_build_parts(unsigned char * ramp)
+static void __init sdebug_build_parts(unsigned char *ramp,
+				      unsigned long store_size)
 {
 	struct partition * pp;
 	int starts[SDEBUG_MAX_PARTS + 2];
@@ -2256,7 +1965,7 @@ static void __init sdebug_build_parts(unsigned char * ramp)
 	int heads_by_sects, start_sec, end_sec;
 
 	/* assume partition table already zeroed */
-	if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576))
+	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;
@@ -2354,7 +2063,6 @@ static int schedule_resp(struct scsi_cmnd * cmnd,
 		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
@@ -2671,11 +2379,9 @@ static ssize_t sdebug_virtual_gb_store(struct device_driver * ddp,
 
 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
 		scsi_debug_virtual_gb = n;
-		if (scsi_debug_virtual_gb > 0) {
-			sdebug_capacity = 2048 * 1024;
-			sdebug_capacity *= scsi_debug_virtual_gb;
-		} else
-			sdebug_capacity = sdebug_store_sectors;
+
+		sdebug_capacity = get_sdebug_capacity();
+
 		return count;
 	}
 	return -EINVAL;
@@ -2775,22 +2481,29 @@ static void do_remove_driverfs_files(void)
 	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
 }
 
+static void pseudo_0_release(struct device *dev)
+{
+	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
+		printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
+}
+
+static struct device pseudo_primary = {
+	.bus_id		= "pseudo_0",
+	.release	= pseudo_0_release,
+};
+
 static int __init scsi_debug_init(void)
 {
-	unsigned int sz;
+	unsigned long sz;
 	int host_to_add;
 	int k;
 	int ret;
 
 	if (scsi_debug_dev_size_mb < 1)
 		scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
-	sdebug_store_size = (unsigned int)scsi_debug_dev_size_mb * 1048576;
-	sdebug_store_sectors = sdebug_store_size / SECT_SIZE;
-	if (scsi_debug_virtual_gb > 0) {
-		sdebug_capacity = 2048 * 1024;
-		sdebug_capacity *= scsi_debug_virtual_gb;
-	} else
-		sdebug_capacity = sdebug_store_sectors;
+	sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;
+	sdebug_store_sectors = sz / SECT_SIZE;
+	sdebug_capacity = get_sdebug_capacity();
 
 	/* play around with geometry, don't waste too much on track 0 */
 	sdebug_heads = 8;
@@ -2809,7 +2522,6 @@ static int __init scsi_debug_init(void)
 			       (sdebug_sectors_per * sdebug_heads);
 	}
 
-	sz = sdebug_store_size;
 	fake_storep = vmalloc(sz);
 	if (NULL == fake_storep) {
 		printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
@@ -2817,7 +2529,7 @@ static int __init scsi_debug_init(void)
 	}
 	memset(fake_storep, 0, sz);
 	if (scsi_debug_num_parts > 0)
-		sdebug_build_parts(fake_storep);
+		sdebug_build_parts(fake_storep, sz);
 
 	ret = device_register(&pseudo_primary);
 	if (ret < 0) {
@@ -2882,41 +2594,17 @@ static void __exit scsi_debug_exit(void)
 
 	stop_all_queued();
 	for (; k; k--)
-		sdebug_remove_adapter();
-	do_remove_driverfs_files();
-	driver_unregister(&sdebug_driverfs_driver);
-	bus_unregister(&pseudo_lld_bus);
-	device_unregister(&pseudo_primary);
-
-	vfree(fake_storep);
-}
-
-device_initcall(scsi_debug_init);
-module_exit(scsi_debug_exit);
-
-static void pseudo_0_release(struct device * dev)
-{
-	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
-		printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
-}
-
-static struct device pseudo_primary = {
-	.bus_id		= "pseudo_0",
-	.release	= pseudo_0_release,
-};
+		sdebug_remove_adapter();
+	do_remove_driverfs_files();
+	driver_unregister(&sdebug_driverfs_driver);
+	bus_unregister(&pseudo_lld_bus);
+	device_unregister(&pseudo_primary);
 
-static int pseudo_lld_bus_match(struct device *dev,
-                          struct device_driver *dev_driver)
-{
-        return 1;
+	vfree(fake_storep);
 }
 
-static struct bus_type pseudo_lld_bus = {
-        .name = "pseudo",
-        .match = pseudo_lld_bus_match,
-	.probe = sdebug_driver_probe,
-	.remove = sdebug_driver_remove,
-};
+device_initcall(scsi_debug_init);
+module_exit(scsi_debug_exit);
 
 static void sdebug_release_adapter(struct device * dev)
 {
@@ -2931,8 +2619,7 @@ static int sdebug_add_adapter(void)
 	int k, devs_per_host;
         int error = 0;
         struct sdebug_host_info *sdbg_host;
-        struct sdebug_dev_info *sdbg_devinfo;
-        struct list_head *lh, *lh_sf;
+	struct sdebug_dev_info *sdbg_devinfo, *tmp;
 
         sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
         if (NULL == sdbg_host) {
@@ -2972,9 +2659,8 @@ static int sdebug_add_adapter(void)
         return error;
 
 clean:
-	list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
-		sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
-					  dev_list);
+	list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
+				 dev_list) {
 		list_del(&sdbg_devinfo->dev_list);
 		kfree(sdbg_devinfo);
 	}
@@ -3002,6 +2688,239 @@ static void sdebug_remove_adapter(void)
         --scsi_debug_add_host;
 }
 
+static
+int scsi_debug_queuecommand(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;
+	int errsts = 0;
+	int target = SCpnt->device->id;
+	struct sdebug_dev_info *devip = NULL;
+	int inj_recovered = 0;
+	int inj_transport = 0;
+	int delay_override = 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_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 */
+	}
+
+	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 (SAI_READ_CAPACITY_16 != cmd[1]) {
+			mk_sense_buffer(devip, ILLEGAL_REQUEST,
+					INVALID_OPCODE, 0);
+			errsts = check_condition_result;
+			break;
+		}
+		errsts = resp_readcap16(SCpnt, devip);
+		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:
+	case READ_6:
+		errsts = check_readiness(SCpnt, 0, devip);
+		if (errsts)
+			break;
+		if (scsi_debug_fake_rw)
+			break;
+		get_data_transfer_info(cmd, &lba, &num);
+		errsts = resp_read(SCpnt, lba, num, devip);
+		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;
+		}
+		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:
+	case WRITE_6:
+		errsts = check_readiness(SCpnt, 0, devip);
+		if (errsts)
+			break;
+		if (scsi_debug_fake_rw)
+			break;
+		get_data_transfer_info(cmd, &lba, &num);
+		errsts = resp_write(SCpnt, lba, num, devip);
+		if (inj_recovered && (0 == errsts)) {
+			mk_sense_buffer(devip, RECOVERED_ERROR,
+					THRESHOLD_EXCEEDED, 0);
+			errsts = check_condition_result;
+		}
+		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);
+		errsts = resp_read(SCpnt, lba, num, devip);
+		if (errsts)
+			break;
+		errsts = resp_write(SCpnt, lba, num, devip);
+		if (errsts)
+			break;
+		errsts = resp_xdwriteread(SCpnt, lba, num, devip);
+		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 struct scsi_host_template sdebug_driver_template = {
 	.proc_info =		scsi_debug_proc_info,
 	.proc_name =		sdebug_proc_name,
@@ -3063,9 +2982,8 @@ static int sdebug_driver_probe(struct device * dev)
 
 static int sdebug_driver_remove(struct device * dev)
 {
-        struct list_head *lh, *lh_sf;
         struct sdebug_host_info *sdbg_host;
-        struct sdebug_dev_info *sdbg_devinfo;
+	struct sdebug_dev_info *sdbg_devinfo, *tmp;
 
 	sdbg_host = to_sdebug_host(dev);
 
@@ -3077,9 +2995,8 @@ static int sdebug_driver_remove(struct device * dev)
 
         scsi_remove_host(sdbg_host->shost);
 
-        list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
-                sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
-                                          dev_list);
+	list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
+				 dev_list) {
                 list_del(&sdbg_devinfo->dev_list);
                 kfree(sdbg_devinfo);
         }
@@ -3088,20 +3005,15 @@ static int sdebug_driver_remove(struct device * dev)
         return 0;
 }
 
-static void sdebug_max_tgts_luns(void)
+static int pseudo_lld_bus_match(struct device *dev,
+				struct device_driver *dev_driver)
 {
-	struct sdebug_host_info * sdbg_host;
-	struct Scsi_Host *hpnt;
-
-	spin_lock(&sdebug_host_list_lock);
-	list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
-		hpnt = sdbg_host->shost;
-		if ((hpnt->this_id >= 0) &&
-		    (scsi_debug_num_tgts > hpnt->this_id))
-			hpnt->max_id = scsi_debug_num_tgts + 1;
-		else
-			hpnt->max_id = scsi_debug_num_tgts;
-		hpnt->max_lun = SAM2_WLUN_REPORT_LUNS; /* scsi_debug_max_luns; */
-	}
-	spin_unlock(&sdebug_host_list_lock);
+	return 1;
 }
+
+static struct bus_type pseudo_lld_bus = {
+	.name = "pseudo",
+	.match = pseudo_lld_bus_match,
+	.probe = sdebug_driver_probe,
+	.remove = sdebug_driver_remove,
+};