Merge patch series "scsi: scsi_debug: Add more tape support"

Kai Mäkisara <Kai.Makisara@kolumbus.fi> says:

Currently, the scsi_debug driver can create tape devices and the st
driver attaches to those. Nothing much can be done with the tape devices
because scsi_debug does not have support for the tape-specific commands
and features. These patches add some more tape support to the scsi_debug
driver. The end result is simulated drives with a tape having one or two
partitions (one partition is created initially).

The tape is implemented as fixed number (10 000) of 8-byte units.
The first four bytes of a unit contain the type of the unit (data
block, filemark or end-of-data mark). If the units is a data block,
the first four bytes also contain the block length and the remaining
four bytes the first bytes of written data. This allows the user
to use tags to see that the read block is what it was supposed to be.

The following SCSI operations are added or modified:
FORMAT MEDIUM
- added
LOCATE
- added
MODE SELECT
- modified to allow use without page(s) (just header and block descriptor)
  - store density and block size
- partition page added
MODE SENSE
- modified to allow use without page(s) (just header and block descriptor)
  - set density and block size
- partition page added
READ BLOCK LIMITS
- added
READ POSITION
- added
READ
- added tape support for READ (6)
REWIND
- modified to set the tape position
SPACE
- added
START STOP (LOAD)
- modified to return New Medium Unit Attention if tape loaded (not
  according to the standard, but enables testing this UA)
WRITE
- added tape support for WRITE (6)
WRITE FILEMARKS
- added

Link: https://lore.kernel.org/r/20250213092636.2510-1-Kai.Makisara@kolumbus.fi
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 761 insertions, 14 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 5ceaa4665e5d..2f60ab9a93bd 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -71,6 +71,10 @@ static const char *sdebug_version_date = "20210520";
 #define NO_ADDITIONAL_SENSE 0x0
 #define OVERLAP_ATOMIC_COMMAND_ASC 0x0
 #define OVERLAP_ATOMIC_COMMAND_ASCQ 0x23
+#define FILEMARK_DETECTED_ASCQ 0x1
+#define EOP_EOM_DETECTED_ASCQ 0x2
+#define BEGINNING_OF_P_M_DETECTED_ASCQ 0x4
+#define EOD_DETECTED_ASCQ 0x5
 #define LOGICAL_UNIT_NOT_READY 0x4
 #define LOGICAL_UNIT_COMMUNICATION_FAILURE 0x8
 #define UNRECOVERED_READ_ERR 0x11
@@ -80,8 +84,10 @@ static const char *sdebug_version_date = "20210520";
 #define INVALID_FIELD_IN_CDB 0x24
 #define INVALID_FIELD_IN_PARAM_LIST 0x26
 #define WRITE_PROTECTED 0x27
+#define UA_READY_ASC 0x28
 #define UA_RESET_ASC 0x29
 #define UA_CHANGED_ASC 0x2a
+#define TOO_MANY_IN_PARTITION_ASC 0x3b
 #define TARGET_CHANGED_ASC 0x3f
 #define LUNS_CHANGED_ASCQ 0x0e
 #define INSUFF_RES_ASC 0x55
@@ -173,6 +179,37 @@ static const char *sdebug_version_date = "20210520";
 #define DEF_ZBC_MAX_OPEN_ZONES	8
 #define DEF_ZBC_NR_CONV_ZONES	1
 
+/* Default parameters for tape drives */
+#define TAPE_DEF_DENSITY  0x0
+#define TAPE_BAD_DENSITY  0x65
+#define TAPE_DEF_BLKSIZE  0
+#define TAPE_MIN_BLKSIZE  512
+#define TAPE_MAX_BLKSIZE  1048576
+#define TAPE_EW 20
+#define TAPE_MAX_PARTITIONS 2
+#define TAPE_UNITS 10000
+#define TAPE_PARTITION_1_UNITS 1000
+
+/* The tape block data definitions */
+#define TAPE_BLOCK_FM_FLAG   ((u32)0x1 << 30)
+#define TAPE_BLOCK_EOD_FLAG  ((u32)0x2 << 30)
+#define TAPE_BLOCK_MARK_MASK ((u32)0x3 << 30)
+#define TAPE_BLOCK_SIZE_MASK (~TAPE_BLOCK_MARK_MASK)
+#define TAPE_BLOCK_MARK(a) (a & TAPE_BLOCK_MARK_MASK)
+#define TAPE_BLOCK_SIZE(a) (a & TAPE_BLOCK_SIZE_MASK)
+#define IS_TAPE_BLOCK_FM(a)   ((a & TAPE_BLOCK_FM_FLAG) != 0)
+#define IS_TAPE_BLOCK_EOD(a)  ((a & TAPE_BLOCK_EOD_FLAG) != 0)
+
+struct tape_block {
+	u32 fl_size;
+	unsigned char data[4];
+};
+
+/* Flags for sense data */
+#define SENSE_FLAG_FILEMARK  0x80
+#define SENSE_FLAG_EOM 0x40
+#define SENSE_FLAG_ILI 0x20
+
 #define SDEBUG_LUN_0_VAL 0
 
 /* bit mask values for sdebug_opts */
@@ -216,7 +253,8 @@ static const char *sdebug_version_date = "20210520";
 #define SDEBUG_UA_LUNS_CHANGED 5
 #define SDEBUG_UA_MICROCODE_CHANGED 6	/* simulate firmware change */
 #define SDEBUG_UA_MICROCODE_CHANGED_WO_RESET 7
-#define SDEBUG_NUM_UAS 8
+#define SDEBUG_UA_NOT_READY_TO_READY 8
+#define SDEBUG_NUM_UAS 9
 
 /* when 1==SDEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
  * sector on read commands: */
@@ -363,6 +401,19 @@ struct sdebug_dev_info {
 	ktime_t create_ts;	/* time since bootup that this device was created */
 	struct sdeb_zone_state *zstate;
 
+	/* For tapes */
+	unsigned int tape_blksize;
+	unsigned int tape_density;
+	unsigned char tape_partition;
+	unsigned char tape_nbr_partitions;
+	unsigned char tape_pending_nbr_partitions;
+	unsigned int tape_pending_part_0_size;
+	unsigned int tape_pending_part_1_size;
+	unsigned char tape_dce;
+	unsigned int tape_location[TAPE_MAX_PARTITIONS];
+	unsigned int tape_eop[TAPE_MAX_PARTITIONS];
+	struct tape_block *tape_blocks[TAPE_MAX_PARTITIONS];
+
 	struct dentry *debugfs_entry;
 	struct spinlock list_lock;
 	struct list_head inject_err_list;
@@ -483,22 +534,27 @@ enum sdeb_opcode_index {
 	SDEB_I_ZONE_OUT = 30,		/* 0x94+SA; includes no data xfer */
 	SDEB_I_ZONE_IN = 31,		/* 0x95+SA; all have data-in */
 	SDEB_I_ATOMIC_WRITE_16 = 32,
-	SDEB_I_LAST_ELEM_P1 = 33,	/* keep this last (previous + 1) */
+	SDEB_I_READ_BLOCK_LIMITS = 33,
+	SDEB_I_LOCATE = 34,
+	SDEB_I_WRITE_FILEMARKS = 35,
+	SDEB_I_SPACE = 36,
+	SDEB_I_FORMAT_MEDIUM = 37,
+	SDEB_I_LAST_ELEM_P1 = 38,	/* keep this last (previous + 1) */
 };
 
 
 static const unsigned char opcode_ind_arr[256] = {
 /* 0x0; 0x0->0x1f: 6 byte cdbs */
 	SDEB_I_TEST_UNIT_READY, SDEB_I_REZERO_UNIT, 0, SDEB_I_REQUEST_SENSE,
-	    0, 0, 0, 0,
+	    SDEB_I_FORMAT_MEDIUM, SDEB_I_READ_BLOCK_LIMITS, 0, 0,
 	SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, 0,
-	0, 0, SDEB_I_INQUIRY, 0, 0, SDEB_I_MODE_SELECT, SDEB_I_RESERVE,
-	    SDEB_I_RELEASE,
+	SDEB_I_WRITE_FILEMARKS, SDEB_I_SPACE, SDEB_I_INQUIRY, 0, 0,
+	    SDEB_I_MODE_SELECT, SDEB_I_RESERVE, SDEB_I_RELEASE,
 	0, 0, SDEB_I_MODE_SENSE, SDEB_I_START_STOP, 0, SDEB_I_SEND_DIAG,
 	    SDEB_I_ALLOW_REMOVAL, 0,
 /* 0x20; 0x20->0x3f: 10 byte cdbs */
 	0, 0, 0, 0, 0, SDEB_I_READ_CAPACITY, 0, 0,
-	SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, SDEB_I_VERIFY,
+	SDEB_I_READ, 0, SDEB_I_WRITE, SDEB_I_LOCATE, 0, 0, 0, SDEB_I_VERIFY,
 	0, 0, 0, 0, SDEB_I_PRE_FETCH, SDEB_I_SYNC_CACHE, 0, 0,
 	0, 0, 0, SDEB_I_WRITE_BUFFER, 0, 0, 0, 0,
 /* 0x40; 0x40->0x5f: 10 byte cdbs */
@@ -573,6 +629,12 @@ static int resp_open_zone(struct scsi_cmnd *, struct sdebug_dev_info *);
 static int resp_close_zone(struct scsi_cmnd *, struct sdebug_dev_info *);
 static int resp_finish_zone(struct scsi_cmnd *, struct sdebug_dev_info *);
 static int resp_rwp_zone(struct scsi_cmnd *, struct sdebug_dev_info *);
+static int resp_read_blklimits(struct scsi_cmnd *, struct sdebug_dev_info *);
+static int resp_locate(struct scsi_cmnd *, struct sdebug_dev_info *);
+static int resp_write_filemarks(struct scsi_cmnd *, struct sdebug_dev_info *);
+static int resp_space(struct scsi_cmnd *, struct sdebug_dev_info *);
+static int resp_rewind(struct scsi_cmnd *, struct sdebug_dev_info *);
+static int resp_format_medium(struct scsi_cmnd *, struct sdebug_dev_info *);
 
 static int sdebug_do_add_host(bool mk_new_store);
 static int sdebug_add_host_helper(int per_host_idx);
@@ -773,7 +835,7 @@ static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEM_P1 + 1] = {
 /* 20 */
 	{0, 0x1e, 0, 0, NULL, NULL, /* ALLOW REMOVAL */
 	    {6,  0, 0, 0, 0x3, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
-	{0, 0x1, 0, 0, resp_start_stop, NULL, /* REWIND ?? */
+	{0, 0x1, 0, 0, resp_rewind, NULL,
 	    {6,  0x1, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
 	{0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* ATA_PT */
 	    {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
@@ -800,6 +862,7 @@ static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEM_P1 + 1] = {
 	    resp_pre_fetch, pre_fetch_iarr,
 	    {10,  0x2, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xc7, 0, 0,
 	     0, 0, 0, 0} },			/* PRE-FETCH (10) */
+						/* READ POSITION (10) */
 
 /* 30 */
 	{ARRAY_SIZE(zone_out_iarr), 0x94, 0x3, F_SA_LOW | F_M_ACCESS,
@@ -810,11 +873,23 @@ static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEM_P1 + 1] = {
 	    resp_report_zones, zone_in_iarr, /* ZONE_IN(16), REPORT ZONES) */
 		{16,  0x0 /* SA */, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 		 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xbf, 0xc7} },
-/* 31 */
+/* 32 */
 	{0, 0x0, 0x0, F_D_OUT | FF_MEDIA_IO,
 	    resp_atomic_write, NULL, /* ATOMIC WRITE 16 */
 		{16,  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 		 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff} },
+	{0, 0x05, 0, F_D_IN, resp_read_blklimits, NULL,    /* READ BLOCK LIMITS (6) */
+	    {6,  0, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
+	{0, 0x2b, 0, F_D_UNKN, resp_locate, NULL,    /* LOCATE (10) */
+	    {10,  0x07, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xff, 0xc7, 0, 0,
+	     0, 0, 0, 0} },
+	{0, 0x10, 0, F_D_IN, resp_write_filemarks, NULL,    /* WRITE FILEMARKS (6) */
+	    {6,  0x01, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
+	{0, 0x11, 0, F_D_IN, resp_space, NULL,    /* SPACE (6) */
+	    {6,  0x07, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
+	{0, 0x4, 0, 0, resp_format_medium, NULL,  /* FORMAT MEDIUM (6) */
+	    {6,  0x3, 0x7, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
+/* 38 */
 /* sentinel */
 	{0xff, 0, 0, 0, NULL, NULL,		/* terminating element */
 	    {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
@@ -1331,6 +1406,30 @@ static void mk_sense_buffer(struct scsi_cmnd *scp, int key, int asc, int asq)
 			    my_name, key, asc, asq);
 }
 
+/* Sense data that has information fields for tapes */
+static void mk_sense_info_tape(struct scsi_cmnd *scp, int key, int asc, int asq,
+			unsigned int information, unsigned char tape_flags)
+{
+	if (!scp->sense_buffer) {
+		sdev_printk(KERN_ERR, scp->device,
+			    "%s: sense_buffer is NULL\n", __func__);
+		return;
+	}
+	memset(scp->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+
+	scsi_build_sense(scp, /* sdebug_dsense */ 0, key, asc, asq);
+	/* only fixed format so far */
+
+	scp->sense_buffer[0] |= 0x80; /* valid */
+	scp->sense_buffer[2] |= tape_flags;
+	put_unaligned_be32(information, &scp->sense_buffer[3]);
+
+	if (sdebug_verbose)
+		sdev_printk(KERN_INFO, scp->device,
+			    "%s:  [sense_key,asc,ascq]: [0x%x,0x%x,0x%x]\n",
+			    my_name, key, asc, asq);
+}
+
 static void mk_sense_invalid_opcode(struct scsi_cmnd *scp)
 {
 	mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
@@ -1493,6 +1592,12 @@ static int make_ua(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 			if (sdebug_verbose)
 				cp = "reported luns data has changed";
 			break;
+		case SDEBUG_UA_NOT_READY_TO_READY:
+			mk_sense_buffer(scp, UNIT_ATTENTION, UA_READY_ASC,
+					0);
+			if (sdebug_verbose)
+				cp = "not ready to ready transition/media change";
+			break;
 		default:
 			pr_warn("unexpected unit attention code=%d\n", k);
 			if (sdebug_verbose)
@@ -2196,6 +2301,14 @@ static int resp_start_stop(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 	changing = (stopped_state != want_stop);
 	if (changing)
 		atomic_xchg(&devip->stopped, want_stop);
+	if (sdebug_ptype == TYPE_TAPE && !want_stop) {
+		int i;
+
+		set_bit(SDEBUG_UA_NOT_READY_TO_READY, devip->uas_bm); /* not legal! */
+		for (i = 0; i < TAPE_MAX_PARTITIONS; i++)
+			devip->tape_location[i] = 0;
+		devip->tape_partition = 0;
+	}
 	if (!changing || (cmd[1] & 0x1))  /* state unchanged or IMMED bit set in cdb */
 		return SDEG_RES_IMMED_MASK;
 	else
@@ -2728,6 +2841,76 @@ static int resp_sas_sha_m_spg(unsigned char *p, int pcontrol)
 	return sizeof(sas_sha_m_pg);
 }
 
+static unsigned char partition_pg[] = {0x11, 12, 1, 0, 0x24, 3, 9, 0,
+	0xff, 0xff, 0x00, 0x00};
+
+static int resp_partition_m_pg(unsigned char *p, int pcontrol, int target)
+{	/* Partition page for mode_sense (tape) */
+	memcpy(p, partition_pg, sizeof(partition_pg));
+	if (pcontrol == 1)
+		memset(p + 2, 0, sizeof(partition_pg) - 2);
+	return sizeof(partition_pg);
+}
+
+static int process_medium_part_m_pg(struct sdebug_dev_info *devip,
+				unsigned char *new, int pg_len)
+{
+	int new_nbr, p0_size, p1_size;
+
+	if ((new[4] & 0x80) != 0) { /* FDP */
+		partition_pg[4] |= 0x80;
+		devip->tape_pending_nbr_partitions = TAPE_MAX_PARTITIONS;
+		devip->tape_pending_part_0_size = TAPE_UNITS - TAPE_PARTITION_1_UNITS;
+		devip->tape_pending_part_1_size = TAPE_PARTITION_1_UNITS;
+	} else {
+		new_nbr = new[3] + 1;
+		if (new_nbr > TAPE_MAX_PARTITIONS)
+			return 3;
+		if ((new[4] & 0x40) != 0) { /* SDP */
+			p1_size = TAPE_PARTITION_1_UNITS;
+			p0_size = TAPE_UNITS - p1_size;
+			if (p0_size < 100)
+				return 4;
+		} else if ((new[4] & 0x20) != 0) {
+			if (new_nbr > 1) {
+				p0_size = get_unaligned_be16(new + 8);
+				p1_size = get_unaligned_be16(new + 10);
+				if (p1_size == 0xFFFF)
+					p1_size = TAPE_UNITS - p0_size;
+				else if (p0_size == 0xFFFF)
+					p0_size = TAPE_UNITS - p1_size;
+				if (p0_size < 100 || p1_size < 100)
+					return 8;
+			} else {
+				p0_size = TAPE_UNITS;
+				p1_size = 0;
+			}
+		} else
+			return 6;
+		devip->tape_pending_nbr_partitions = new_nbr;
+		devip->tape_pending_part_0_size = p0_size;
+		devip->tape_pending_part_1_size = p1_size;
+		partition_pg[3] = new_nbr;
+		devip->tape_pending_nbr_partitions = new_nbr;
+	}
+
+	return 0;
+}
+
+static int resp_compression_m_pg(unsigned char *p, int pcontrol, int target,
+	unsigned char dce)
+{	/* Compression page for mode_sense (tape) */
+	unsigned char compression_pg[] = {0x0f, 14, 0x40, 0, 0, 0, 0, 0,
+		0, 0, 0, 0, 00, 00};
+
+	memcpy(p, compression_pg, sizeof(compression_pg));
+	if (dce)
+		p[2] |= 0x80;
+	if (pcontrol == 1)
+		memset(p + 2, 0, sizeof(compression_pg) - 2);
+	return sizeof(compression_pg);
+}
+
 /* PAGE_SIZE is more than necessary but provides room for future expansion. */
 #define SDEBUG_MAX_MSENSE_SZ PAGE_SIZE
 
@@ -2742,7 +2925,7 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	unsigned char *ap;
 	unsigned char *arr __free(kfree);
 	unsigned char *cmd = scp->cmnd;
-	bool dbd, llbaa, msense_6, is_disk, is_zbc;
+	bool dbd, llbaa, msense_6, is_disk, is_zbc, is_tape;
 
 	arr = kzalloc(SDEBUG_MAX_MSENSE_SZ, GFP_ATOMIC);
 	if (!arr)
@@ -2755,7 +2938,8 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	llbaa = msense_6 ? false : !!(cmd[1] & 0x10);
 	is_disk = (sdebug_ptype == TYPE_DISK);
 	is_zbc = devip->zoned;
-	if ((is_disk || is_zbc) && !dbd)
+	is_tape = (sdebug_ptype == TYPE_TAPE);
+	if ((is_disk || is_zbc || is_tape) && !dbd)
 		bd_len = llbaa ? 16 : 8;
 	else
 		bd_len = 0;
@@ -2793,15 +2977,25 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 			put_unaligned_be32(0xffffffff, ap + 0);
 		else
 			put_unaligned_be32(sdebug_capacity, ap + 0);
-		put_unaligned_be16(sdebug_sector_size, ap + 6);
+		if (is_tape) {
+			ap[0] = devip->tape_density;
+			put_unaligned_be16(devip->tape_blksize, ap + 6);
+		} else
+			put_unaligned_be16(sdebug_sector_size, ap + 6);
 		offset += bd_len;
 		ap = arr + offset;
 	} else if (16 == bd_len) {
+		if (is_tape) {
+			mk_sense_invalid_fld(scp, SDEB_IN_DATA, 1, 4);
+			return check_condition_result;
+		}
 		put_unaligned_be64((u64)sdebug_capacity, ap + 0);
 		put_unaligned_be32(sdebug_sector_size, ap + 12);
 		offset += bd_len;
 		ap = arr + offset;
 	}
+	if (cmd[2] == 0)
+		goto only_bd; /* Only block descriptor requested */
 
 	/*
 	 * N.B. If len>0 before resp_*_pg() call, then form of that call should be:
@@ -2857,6 +3051,18 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 		}
 		offset += len;
 		break;
+	case 0xf:	/* Compression Mode Page (tape) */
+		if (!is_tape)
+			goto bad_pcode;
+		len += resp_compression_m_pg(ap, pcontrol, target, devip->tape_dce);
+		offset += len;
+		break;
+	case 0x11:	/* Partition Mode Page (tape) */
+		if (!is_tape)
+			goto bad_pcode;
+		len = resp_partition_m_pg(ap, pcontrol, target);
+		offset += len;
+		break;
 	case 0x19:	/* if spc==1 then sas phy, control+discover */
 		if (subpcode > 0x2 && subpcode < 0xff)
 			goto bad_subpcode;
@@ -2902,6 +3108,7 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	default:
 		goto bad_pcode;
 	}
+only_bd:
 	if (msense_6)
 		arr[0] = offset - 1;
 	else
@@ -2945,8 +3152,34 @@ static int resp_mode_select(struct scsi_cmnd *scp,
 			    __func__, param_len, res);
 	md_len = mselect6 ? (arr[0] + 1) : (get_unaligned_be16(arr + 0) + 2);
 	bd_len = mselect6 ? arr[3] : get_unaligned_be16(arr + 6);
-	off = bd_len + (mselect6 ? 4 : 8);
-	if (md_len > 2 || off >= res) {
+	off = (mselect6 ? 4 : 8);
+	if (sdebug_ptype == TYPE_TAPE) {
+		int blksize;
+
+		if (bd_len != 8) {
+			mk_sense_invalid_fld(scp, SDEB_IN_DATA,
+					mselect6 ? 3 : 6, -1);
+			return check_condition_result;
+		}
+		if (arr[off] == TAPE_BAD_DENSITY) {
+			mk_sense_invalid_fld(scp, SDEB_IN_DATA, 0, -1);
+			return check_condition_result;
+		}
+		blksize = get_unaligned_be16(arr + off + 6);
+		if (blksize != 0 &&
+			(blksize < TAPE_MIN_BLKSIZE ||
+				blksize > TAPE_MAX_BLKSIZE ||
+				(blksize % 4) != 0)) {
+			mk_sense_invalid_fld(scp, SDEB_IN_DATA, 1, -1);
+			return check_condition_result;
+		}
+		devip->tape_density = arr[off];
+		devip->tape_blksize = blksize;
+	}
+	off += bd_len;
+	if (off >= res)
+		return 0; /* No page written, just descriptors */
+	if (md_len > 2) {
 		mk_sense_invalid_fld(scp, SDEB_IN_DATA, 0, -1);
 		return check_condition_result;
 	}
@@ -2984,6 +3217,25 @@ static int resp_mode_select(struct scsi_cmnd *scp,
 			goto set_mode_changed_ua;
 		}
 		break;
+	case 0xf:       /* Compression mode page */
+		if (sdebug_ptype != TYPE_TAPE)
+			goto bad_pcode;
+		if ((arr[off + 2] & 0x40) != 0) {
+			devip->tape_dce = (arr[off + 2] & 0x80) != 0;
+			return 0;
+		}
+		break;
+	case 0x11:	/* Medium Partition Mode Page (tape) */
+		if (sdebug_ptype == TYPE_TAPE) {
+			int fld;
+
+			fld = process_medium_part_m_pg(devip, &arr[off], pg_len);
+			if (fld == 0)
+				return 0;
+			mk_sense_invalid_fld(scp, SDEB_IN_DATA, fld, -1);
+			return check_condition_result;
+		}
+		break;
 	case 0x1c:      /* Informational Exceptions Mode page */
 		if (iec_m_pg[1] == arr[off + 1]) {
 			memcpy(iec_m_pg + 2, arr + off + 2,
@@ -2999,6 +3251,10 @@ static int resp_mode_select(struct scsi_cmnd *scp,
 set_mode_changed_ua:
 	set_bit(SDEBUG_UA_MODE_CHANGED, devip->uas_bm);
 	return 0;
+
+bad_pcode:
+	mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5);
+	return check_condition_result;
 }
 
 static int resp_temp_l_pg(unsigned char *arr)
@@ -3138,6 +3394,265 @@ static int resp_log_sense(struct scsi_cmnd *scp,
 		    min_t(u32, len, SDEBUG_MAX_INQ_ARR_SZ));
 }
 
+enum {SDEBUG_READ_BLOCK_LIMITS_ARR_SZ = 6};
+static int resp_read_blklimits(struct scsi_cmnd *scp,
+			struct sdebug_dev_info *devip)
+{
+	unsigned char arr[SDEBUG_READ_BLOCK_LIMITS_ARR_SZ];
+
+	arr[0] = 4;
+	put_unaligned_be24(TAPE_MAX_BLKSIZE, arr + 1);
+	put_unaligned_be16(TAPE_MIN_BLKSIZE, arr + 4);
+	return fill_from_dev_buffer(scp, arr, SDEBUG_READ_BLOCK_LIMITS_ARR_SZ);
+}
+
+static int resp_locate(struct scsi_cmnd *scp,
+		struct sdebug_dev_info *devip)
+{
+	unsigned char *cmd = scp->cmnd;
+	unsigned int i, pos;
+	struct tape_block *blp;
+	int partition;
+
+	if ((cmd[1] & 0x02) != 0) {
+		if (cmd[8] >= devip->tape_nbr_partitions) {
+			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 8, -1);
+			return check_condition_result;
+		}
+		devip->tape_partition = cmd[8];
+	}
+	pos = get_unaligned_be32(cmd + 3);
+	partition = devip->tape_partition;
+
+	for (i = 0, blp = devip->tape_blocks[partition];
+	     i < pos && i < devip->tape_eop[partition]; i++, blp++)
+		if (IS_TAPE_BLOCK_EOD(blp->fl_size))
+			break;
+	if (i < pos) {
+		devip->tape_location[partition] = i;
+		mk_sense_buffer(scp, BLANK_CHECK, 0x05, 0);
+		return check_condition_result;
+	}
+	devip->tape_location[partition] = pos;
+
+	return 0;
+}
+
+static int resp_write_filemarks(struct scsi_cmnd *scp,
+		struct sdebug_dev_info *devip)
+{
+	unsigned char *cmd = scp->cmnd;
+	unsigned int i, count, pos;
+	u32 data;
+	int partition = devip->tape_partition;
+
+	if ((cmd[1] & 0xfe) != 0) { /* probably write setmarks, not in >= SCSI-3 */
+		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 1);
+		return check_condition_result;
+	}
+	count = get_unaligned_be24(cmd + 2);
+	data = TAPE_BLOCK_FM_FLAG;
+	for (i = 0, pos = devip->tape_location[partition]; i < count; i++, pos++) {
+		if (pos >= devip->tape_eop[partition] - 1) { /* don't overwrite EOD */
+			devip->tape_location[partition] = devip->tape_eop[partition] - 1;
+			mk_sense_info_tape(scp, VOLUME_OVERFLOW, NO_ADDITIONAL_SENSE,
+					EOP_EOM_DETECTED_ASCQ, count, SENSE_FLAG_EOM);
+			return check_condition_result;
+		}
+		(devip->tape_blocks[partition] + pos)->fl_size = data;
+	}
+	(devip->tape_blocks[partition] + pos)->fl_size =
+		TAPE_BLOCK_EOD_FLAG;
+	devip->tape_location[partition] = pos;
+
+	return 0;
+}
+
+static int resp_space(struct scsi_cmnd *scp,
+		struct sdebug_dev_info *devip)
+{
+	unsigned char *cmd = scp->cmnd, code;
+	int i = 0, pos, count;
+	struct tape_block *blp;
+	int partition = devip->tape_partition;
+
+	count = get_unaligned_be24(cmd + 2);
+	if ((count & 0x800000) != 0) /* extend negative to 32-bit count */
+		count |= 0xff000000;
+	code = cmd[1] & 0x0f;
+
+	pos = devip->tape_location[partition];
+	if (code == 0) { /* blocks */
+		if (count < 0) {
+			count = (-count);
+			pos -= 1;
+			for (i = 0, blp = devip->tape_blocks[partition] + pos; i < count;
+			     i++) {
+				if (pos < 0)
+					goto is_bop;
+				else if (IS_TAPE_BLOCK_FM(blp->fl_size))
+					goto is_fm;
+				if (i > 0) {
+					pos--;
+					blp--;
+				}
+			}
+		} else if (count > 0) {
+			for (i = 0, blp = devip->tape_blocks[partition] + pos; i < count;
+			     i++, pos++, blp++) {
+				if (IS_TAPE_BLOCK_EOD(blp->fl_size))
+					goto is_eod;
+				if (IS_TAPE_BLOCK_FM(blp->fl_size)) {
+					pos += 1;
+					goto is_fm;
+				}
+				if (pos >= devip->tape_eop[partition])
+					goto is_eop;
+			}
+		}
+	} else if (code == 1) { /* filemarks */
+		if (count < 0) {
+			count = (-count);
+			if (pos == 0)
+				goto is_bop;
+			else {
+				for (i = 0, blp = devip->tape_blocks[partition] + pos;
+				     i < count && pos >= 0; i++, pos--, blp--) {
+					for (pos--, blp-- ; !IS_TAPE_BLOCK_FM(blp->fl_size) &&
+						     pos >= 0; pos--, blp--)
+						; /* empty */
+					if (pos < 0)
+						goto is_bop;
+				}
+			}
+			pos += 1;
+		} else if (count > 0) {
+			for (i = 0, blp = devip->tape_blocks[partition] + pos;
+			     i < count; i++, pos++, blp++) {
+				for ( ; !IS_TAPE_BLOCK_FM(blp->fl_size) &&
+					      !IS_TAPE_BLOCK_EOD(blp->fl_size) &&
+					      pos < devip->tape_eop[partition];
+				      pos++, blp++)
+					; /* empty */
+				if (IS_TAPE_BLOCK_EOD(blp->fl_size))
+					goto is_eod;
+				if (pos >= devip->tape_eop[partition])
+					goto is_eop;
+			}
+		}
+	} else if (code == 3) { /* EOD */
+		for (blp = devip->tape_blocks[partition] + pos;
+		     !IS_TAPE_BLOCK_EOD(blp->fl_size) && pos < devip->tape_eop[partition];
+		     pos++, blp++)
+			; /* empty */
+		if (pos >= devip->tape_eop[partition])
+			goto is_eop;
+	} else {
+		/* sequential filemarks not supported */
+		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 8, -1);
+		return check_condition_result;
+	}
+	devip->tape_location[partition] = pos;
+	return 0;
+
+is_fm:
+	devip->tape_location[partition] = pos;
+	mk_sense_info_tape(scp, NO_SENSE, NO_ADDITIONAL_SENSE,
+			FILEMARK_DETECTED_ASCQ, count - i,
+			SENSE_FLAG_FILEMARK);
+	return check_condition_result;
+
+is_eod:
+	devip->tape_location[partition] = pos;
+	mk_sense_info_tape(scp, BLANK_CHECK, NO_ADDITIONAL_SENSE,
+			EOD_DETECTED_ASCQ, count - i,
+			0);
+	return check_condition_result;
+
+is_bop:
+	devip->tape_location[partition] = 0;
+	mk_sense_info_tape(scp, NO_SENSE, NO_ADDITIONAL_SENSE,
+			BEGINNING_OF_P_M_DETECTED_ASCQ, count - i,
+			SENSE_FLAG_EOM);
+	devip->tape_location[partition] = 0;
+	return check_condition_result;
+
+is_eop:
+	devip->tape_location[partition] = devip->tape_eop[partition] - 1;
+	mk_sense_info_tape(scp, MEDIUM_ERROR, NO_ADDITIONAL_SENSE,
+			EOP_EOM_DETECTED_ASCQ, (unsigned int)i,
+			SENSE_FLAG_EOM);
+	return check_condition_result;
+}
+
+static int resp_rewind(struct scsi_cmnd *scp,
+		struct sdebug_dev_info *devip)
+{
+	devip->tape_location[devip->tape_partition] = 0;
+
+	return 0;
+}
+
+static int partition_tape(struct sdebug_dev_info *devip, int nbr_partitions,
+			int part_0_size, int part_1_size)
+{
+	int i;
+
+	if (part_0_size + part_1_size > TAPE_UNITS)
+		return -1;
+	devip->tape_eop[0] = part_0_size;
+	devip->tape_blocks[0]->fl_size = TAPE_BLOCK_EOD_FLAG;
+	devip->tape_eop[1] = part_1_size;
+	devip->tape_blocks[1] = devip->tape_blocks[0] +
+			devip->tape_eop[0];
+	devip->tape_blocks[1]->fl_size = TAPE_BLOCK_EOD_FLAG;
+
+	for (i = 0 ; i < TAPE_MAX_PARTITIONS; i++)
+		devip->tape_location[i] = 0;
+
+	devip->tape_nbr_partitions = nbr_partitions;
+	devip->tape_partition = 0;
+
+	partition_pg[3] = nbr_partitions - 1;
+	put_unaligned_be16(devip->tape_eop[0], partition_pg + 8);
+	put_unaligned_be16(devip->tape_eop[1], partition_pg + 10);
+
+	return nbr_partitions;
+}
+
+static int resp_format_medium(struct scsi_cmnd *scp,
+			struct sdebug_dev_info *devip)
+{
+	int res = 0;
+	unsigned char *cmd = scp->cmnd;
+
+	if (sdebug_ptype != TYPE_TAPE) {
+		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 0, -1);
+		return check_condition_result;
+	}
+	if (cmd[2] > 2) {
+		mk_sense_invalid_fld(scp, SDEB_IN_DATA, 2, -1);
+		return check_condition_result;
+	}
+	if (cmd[2] != 0) {
+		if (devip->tape_pending_nbr_partitions > 0) {
+			res = partition_tape(devip,
+					devip->tape_pending_nbr_partitions,
+					devip->tape_pending_part_0_size,
+					devip->tape_pending_part_1_size);
+		} else
+			res = partition_tape(devip, devip->tape_nbr_partitions,
+					devip->tape_eop[0], devip->tape_eop[1]);
+	} else
+		res = partition_tape(devip, 1, TAPE_UNITS, 0);
+	if (res < 0)
+		return -EINVAL;
+
+	devip->tape_pending_nbr_partitions = -1;
+
+	return 0;
+}
+
 static inline bool sdebug_dev_is_zoned(struct sdebug_dev_info *devip)
 {
 	return devip->nr_zones != 0;
@@ -3871,6 +4386,98 @@ static int prot_verify_read(struct scsi_cmnd *scp, sector_t start_sec,
 	return ret;
 }
 
+static int resp_read_tape(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
+{
+	u32 i, num, transfer, size;
+	u8 *cmd = scp->cmnd;
+	struct scsi_data_buffer *sdb = &scp->sdb;
+	int partition = devip->tape_partition;
+	u32 pos = devip->tape_location[partition];
+	struct tape_block *blp;
+	bool fixed, sili;
+
+	if (cmd[0] != READ_6) { /* Only Read(6) supported */
+		mk_sense_invalid_opcode(scp);
+		return illegal_condition_result;
+	}
+	fixed = (cmd[1] & 0x1) != 0;
+	sili = (cmd[1] & 0x2) != 0;
+	if (fixed && sili) {
+		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 1);
+		return check_condition_result;
+	}
+
+	transfer = get_unaligned_be24(cmd + 2);
+	if (fixed) {
+		num = transfer;
+		size = devip->tape_blksize;
+	} else {
+		if (transfer < TAPE_MIN_BLKSIZE ||
+			transfer > TAPE_MAX_BLKSIZE) {
+			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1);
+			return check_condition_result;
+		}
+		num = 1;
+		size = transfer;
+	}
+
+	for (i = 0, blp = devip->tape_blocks[partition] + pos;
+	     i < num && pos < devip->tape_eop[partition];
+	     i++, pos++, blp++) {
+		devip->tape_location[partition] = pos + 1;
+		if (IS_TAPE_BLOCK_FM(blp->fl_size)) {
+			mk_sense_info_tape(scp, NO_SENSE, NO_ADDITIONAL_SENSE,
+					FILEMARK_DETECTED_ASCQ, fixed ? num - i : size,
+					SENSE_FLAG_FILEMARK);
+			scsi_set_resid(scp, (num - i) * size);
+			return check_condition_result;
+		}
+		/* Assume no REW */
+		if (IS_TAPE_BLOCK_EOD(blp->fl_size)) {
+			mk_sense_info_tape(scp, BLANK_CHECK, NO_ADDITIONAL_SENSE,
+					EOD_DETECTED_ASCQ, fixed ? num - i : size,
+					0);
+			devip->tape_location[partition] = pos;
+			scsi_set_resid(scp, (num - i) * size);
+			return check_condition_result;
+		}
+		sg_zero_buffer(sdb->table.sgl, sdb->table.nents,
+			size, i * size);
+		sg_copy_buffer(sdb->table.sgl, sdb->table.nents,
+			&(blp->data), 4, i * size, false);
+		if (fixed) {
+			if (blp->fl_size != devip->tape_blksize) {
+				scsi_set_resid(scp, (num - i) * size);
+				mk_sense_info_tape(scp, NO_SENSE, NO_ADDITIONAL_SENSE,
+						0, num - i,
+						SENSE_FLAG_ILI);
+				return check_condition_result;
+			}
+		} else {
+			if (blp->fl_size != size) {
+				if (blp->fl_size < size)
+					scsi_set_resid(scp, size - blp->fl_size);
+				if (!sili) {
+					mk_sense_info_tape(scp, NO_SENSE, NO_ADDITIONAL_SENSE,
+							0, size - blp->fl_size,
+							SENSE_FLAG_ILI);
+					return check_condition_result;
+				}
+			}
+		}
+	}
+	if (pos >= devip->tape_eop[partition]) {
+		mk_sense_info_tape(scp, NO_SENSE, NO_ADDITIONAL_SENSE,
+				EOP_EOM_DETECTED_ASCQ, fixed ? num - i : size,
+				SENSE_FLAG_EOM);
+		devip->tape_location[partition] = pos - 1;
+		return check_condition_result;
+	}
+	devip->tape_location[partition] = pos;
+
+	return 0;
+}
+
 static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 {
 	bool check_prot;
@@ -3882,6 +4489,9 @@ static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 	u8 *cmd = scp->cmnd;
 	bool meta_data_locked = false;
 
+	if (sdebug_ptype == TYPE_TAPE)
+		return resp_read_tape(scp, devip);
+
 	switch (cmd[0]) {
 	case READ_16:
 		ei_lba = 0;
@@ -4178,6 +4788,67 @@ static void unmap_region(struct sdeb_store_info *sip, sector_t lba,
 	}
 }
 
+static int resp_write_tape(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
+{
+	u32 i, num, transfer, size, written = 0;
+	u8 *cmd = scp->cmnd;
+	struct scsi_data_buffer *sdb = &scp->sdb;
+	int partition = devip->tape_partition;
+	int pos = devip->tape_location[partition];
+	struct tape_block *blp;
+	bool fixed, ew;
+
+	if (cmd[0] != WRITE_6) { /* Only Write(6) supported */
+		mk_sense_invalid_opcode(scp);
+		return illegal_condition_result;
+	}
+
+	fixed = (cmd[1] & 1) != 0;
+	transfer = get_unaligned_be24(cmd + 2);
+	if (fixed) {
+		num = transfer;
+		size = devip->tape_blksize;
+	} else {
+		if (transfer < TAPE_MIN_BLKSIZE ||
+			transfer > TAPE_MAX_BLKSIZE) {
+			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1);
+			return check_condition_result;
+		}
+		num = 1;
+		size = transfer;
+	}
+
+	scsi_set_resid(scp, num * transfer);
+	for (i = 0, blp = devip->tape_blocks[partition] + pos, ew = false;
+	     i < num && pos < devip->tape_eop[partition] - 1; i++, pos++, blp++) {
+		blp->fl_size = size;
+		sg_copy_buffer(sdb->table.sgl, sdb->table.nents,
+			&(blp->data), 4, i * size, true);
+		written += size;
+		scsi_set_resid(scp, num * transfer - written);
+		ew |= (pos == devip->tape_eop[partition] - TAPE_EW);
+	}
+
+	devip->tape_location[partition] = pos;
+	blp->fl_size = TAPE_BLOCK_EOD_FLAG;
+	if (pos >= devip->tape_eop[partition] - 1) {
+		mk_sense_info_tape(scp, VOLUME_OVERFLOW,
+				NO_ADDITIONAL_SENSE, EOP_EOM_DETECTED_ASCQ,
+				fixed ? num - i : transfer,
+				SENSE_FLAG_EOM);
+		return check_condition_result;
+	}
+	if (ew) { /* early warning */
+		mk_sense_info_tape(scp, NO_SENSE,
+				NO_ADDITIONAL_SENSE, EOP_EOM_DETECTED_ASCQ,
+				fixed ? num - i : transfer,
+				SENSE_FLAG_EOM);
+		return check_condition_result;
+	}
+
+	return 0;
+}
+
 static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 {
 	bool check_prot;
@@ -4190,6 +4861,9 @@ static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 	u8 *cmd = scp->cmnd;
 	bool meta_data_locked = false;
 
+	if (sdebug_ptype == TYPE_TAPE)
+		return resp_write_tape(scp, devip);
+
 	switch (cmd[0]) {
 	case WRITE_16:
 		ei_lba = 0;
@@ -4918,7 +5592,10 @@ static int resp_sync_cache(struct scsi_cmnd *scp,
  * a GOOD status otherwise. Model a disk with a big cache and yield
  * CONDITION MET. Actually tries to bring range in main memory into the
  * cache associated with the CPU(s).
+ *
+ * The pcode 0x34 is also used for READ POSITION by tape devices.
  */
+enum {SDEBUG_READ_POSITION_ARR_SZ = 20};
 static int resp_pre_fetch(struct scsi_cmnd *scp,
 			  struct sdebug_dev_info *devip)
 {
@@ -4930,6 +5607,31 @@ static int resp_pre_fetch(struct scsi_cmnd *scp,
 	struct sdeb_store_info *sip = devip2sip(devip, true);
 	u8 *fsp = sip->storep;
 
+	if (sdebug_ptype == TYPE_TAPE) {
+		if (cmd[0] == PRE_FETCH) { /* READ POSITION (10) */
+			int all_length;
+			unsigned char arr[20];
+			unsigned int pos;
+
+			all_length = get_unaligned_be16(cmd + 7);
+			if ((cmd[1] & 0xfe) != 0 ||
+				all_length != 0) { /* only short form */
+				mk_sense_invalid_fld(scp, SDEB_IN_CDB,
+						all_length ? 7 : 1, 0);
+				return check_condition_result;
+			}
+			memset(arr, 0, SDEBUG_READ_POSITION_ARR_SZ);
+			arr[1] = devip->tape_partition;
+			pos = devip->tape_location[devip->tape_partition];
+			put_unaligned_be32(pos, arr + 4);
+			put_unaligned_be32(pos, arr + 8);
+			return fill_from_dev_buffer(scp, arr,
+						SDEBUG_READ_POSITION_ARR_SZ);
+		}
+		mk_sense_invalid_opcode(scp);
+		return check_condition_result;
+	}
+
 	if (cmd[0] == PRE_FETCH) {	/* 10 byte cdb */
 		lba = get_unaligned_be32(cmd + 2);
 		nblks = get_unaligned_be16(cmd + 7);
@@ -5835,6 +6537,10 @@ static struct sdebug_dev_info *sdebug_device_create(
 		} else {
 			devip->zoned = false;
 		}
+		if (sdebug_ptype == TYPE_TAPE) {
+			devip->tape_density = TAPE_DEF_DENSITY;
+			devip->tape_blksize = TAPE_DEF_BLKSIZE;
+		}
 		devip->create_ts = ktime_get_boottime();
 		atomic_set(&devip->stopped, (sdeb_tur_ms_to_ready > 0 ? 2 : 0));
 		spin_lock_init(&devip->list_lock);
@@ -5905,6 +6611,21 @@ static int scsi_debug_sdev_configure(struct scsi_device *sdp,
 		if (devip == NULL)
 			return 1;  /* no resources, will be marked offline */
 	}
+	if (sdebug_ptype == TYPE_TAPE) {
+		if (!devip->tape_blocks[0]) {
+			devip->tape_blocks[0] =
+				kcalloc(TAPE_UNITS, sizeof(struct tape_block),
+					GFP_KERNEL);
+			if (!devip->tape_blocks[0])
+				return 1;
+		}
+		devip->tape_pending_nbr_partitions = -1;
+		if (partition_tape(devip, 1, TAPE_UNITS, 0) < 0) {
+			kfree(devip->tape_blocks[0]);
+			devip->tape_blocks[0] = NULL;
+			return 1;
+		}
+	}
 	sdp->hostdata = devip;
 	if (sdebug_no_uld)
 		sdp->no_uld_attach = 1;
@@ -5950,6 +6671,11 @@ static void scsi_debug_sdev_destroy(struct scsi_device *sdp)
 
 	debugfs_remove(devip->debugfs_entry);
 
+	if (sdebug_ptype == TYPE_TAPE) {
+		kfree(devip->tape_blocks[0]);
+		devip->tape_blocks[0] = NULL;
+	}
+
 	/* make this slot available for re-use */
 	devip->used = false;
 	sdp->hostdata = NULL;
@@ -6144,6 +6870,22 @@ static int sdebug_fail_lun_reset(struct scsi_cmnd *cmnd)
 	return 0;
 }
 
+static void scsi_tape_reset_clear(struct sdebug_dev_info *devip)
+{
+	if (sdebug_ptype == TYPE_TAPE) {
+		int i;
+
+		devip->tape_blksize = TAPE_DEF_BLKSIZE;
+		devip->tape_density = TAPE_DEF_DENSITY;
+		devip->tape_partition = 0;
+		devip->tape_dce = 0;
+		for (i = 0; i < TAPE_MAX_PARTITIONS; i++)
+			devip->tape_location[i] = 0;
+		devip->tape_pending_nbr_partitions = -1;
+		/* Don't reset partitioning? */
+	}
+}
+
 static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt)
 {
 	struct scsi_device *sdp = SCpnt->device;
@@ -6157,8 +6899,10 @@ static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt)
 		sdev_printk(KERN_INFO, sdp, "%s\n", __func__);
 
 	scsi_debug_stop_all_queued(sdp);
-	if (devip)
+	if (devip) {
 		set_bit(SDEBUG_UA_POR, devip->uas_bm);
+		scsi_tape_reset_clear(devip);
+	}
 
 	if (sdebug_fail_lun_reset(SCpnt)) {
 		scmd_printk(KERN_INFO, SCpnt, "fail lun reset 0x%x\n", opcode);
@@ -6196,6 +6940,7 @@ static int scsi_debug_target_reset(struct scsi_cmnd *SCpnt)
 	list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
 		if (devip->target == sdp->id) {
 			set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
+			scsi_tape_reset_clear(devip);
 			++k;
 		}
 	}
@@ -6227,6 +6972,7 @@ static int scsi_debug_bus_reset(struct scsi_cmnd *SCpnt)
 
 	list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
 		set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
+		scsi_tape_reset_clear(devip);
 		++k;
 	}
 
@@ -6250,6 +6996,7 @@ static int scsi_debug_host_reset(struct scsi_cmnd *SCpnt)
 		list_for_each_entry(devip, &sdbg_host->dev_info_list,
 				    dev_list) {
 			set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
+			scsi_tape_reset_clear(devip);
 			++k;
 		}
 	}