[PATCH] SCSI cdrom cleanup

This is one of the very early steps on cleaning up the SCSI cdrom
driver.  It gets rid of directly accessing the scsi_CDs array in favour
of using the handle we get from the generic cdrom layer.  Also uses
local vars instead of many grouped scsi_CDs accesses in other places.

The gain is to get rid of the global, static array of CDROMS
in the end.

drivers/scsi/sr.h

@@ -53,7 +53,7 @@ int sr_read_sector(int minor, int lba, int blksize, unsigned char *dest);
 int sr_is_xa(int minor);
 
 /* sr_vendor.c */
-void sr_vendor_init(int minor);
+void sr_vendor_init(Scsi_CD *);
 int sr_cd_check(struct cdrom_device_info *);
 int sr_set_blocklength(int minor, int blocklength);
 

drivers/scsi/sr_ioctl.c

@@ -84,7 +84,7 @@ int sr_do_ioctl(int target, unsigned char *sr_cmd, void *buffer, unsigned buflen
 	char *bounce_buffer;
 
 	SDev = scsi_CDs[target].device;
-	SRpnt = scsi_allocate_request(scsi_CDs[target].device);
+	SRpnt = scsi_allocate_request(SDev);
         if (!SRpnt) {
                 printk("Unable to allocate SCSI request in sr_do_ioctl");
                 return -ENOMEM;
@@ -124,7 +124,7 @@ int sr_do_ioctl(int target, unsigned char *sr_cmd, void *buffer, unsigned buflen
 	if (driver_byte(result) != 0) {
 		switch (SRpnt->sr_sense_buffer[2] & 0xf) {
 		case UNIT_ATTENTION:
-			scsi_CDs[target].device->changed = 1;
+			SDev->changed = 1;
 			if (!quiet)
 				printk(KERN_INFO "sr%d: disc change detected.\n", target);
 			if (retries++ < 10)
@@ -192,22 +192,25 @@ int sr_do_ioctl(int target, unsigned char *sr_cmd, void *buffer, unsigned buflen
 
 static int test_unit_ready(int minor)
 {
+	Scsi_CD *SCp;
 	u_char sr_cmd[10];
 
+	SCp = &scsi_CDs[minor];
 	sr_cmd[0] = GPCMD_TEST_UNIT_READY;
-	sr_cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-	            ((scsi_CDs[minor].device->lun) << 5) : 0;
+	sr_cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+	            ((SCp->device->lun) << 5) : 0;
 	sr_cmd[2] = sr_cmd[3] = sr_cmd[4] = sr_cmd[5] = 0;
 	return sr_do_ioctl(minor, sr_cmd, NULL, 0, 1, SCSI_DATA_NONE, NULL);
 }
 
 int sr_tray_move(struct cdrom_device_info *cdi, int pos)
 {
+	Scsi_CD *SCp = cdi->handle;
 	u_char sr_cmd[10];
 
 	sr_cmd[0] = GPCMD_START_STOP_UNIT;
-	sr_cmd[1] = (scsi_CDs[minor(cdi->dev)].device->scsi_level <= SCSI_2) ?
-	            ((scsi_CDs[minor(cdi->dev)].device->lun) << 5) : 0;
+	sr_cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+	            ((SCp->device->lun) << 5) : 0;
 	sr_cmd[2] = sr_cmd[3] = sr_cmd[5] = 0;
 	sr_cmd[4] = (pos == 0) ? 0x03 /* close */ : 0x02 /* eject */ ;
 
@@ -216,9 +219,10 @@ int sr_tray_move(struct cdrom_device_info *cdi, int pos)
 
 int sr_lock_door(struct cdrom_device_info *cdi, int lock)
 {
-	return scsi_ioctl(scsi_CDs[minor(cdi->dev)].device,
-		      lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK,
-			  0);
+	Scsi_CD *SCp = cdi->handle;
+
+	return scsi_ioctl(SCp->device, lock ? SCSI_IOCTL_DOORLOCK :
+			SCSI_IOCTL_DOORUNLOCK, 0);
 }
 
 int sr_drive_status(struct cdrom_device_info *cdi, int slot)
@@ -235,6 +239,7 @@ int sr_drive_status(struct cdrom_device_info *cdi, int slot)
 
 int sr_disk_status(struct cdrom_device_info *cdi)
 {
+	Scsi_CD *SCp = cdi->handle;
 	struct cdrom_tochdr toc_h;
 	struct cdrom_tocentry toc_e;
 	int i, rc, have_datatracks = 0;
@@ -256,7 +261,7 @@ int sr_disk_status(struct cdrom_device_info *cdi)
 	if (!have_datatracks)
 		return CDS_AUDIO;
 
-	if (scsi_CDs[minor(cdi->dev)].xa_flag)
+	if (SCp->xa_flag)
 		return CDS_XA_2_1;
 	else
 		return CDS_DATA_1;
@@ -265,22 +270,24 @@ int sr_disk_status(struct cdrom_device_info *cdi)
 int sr_get_last_session(struct cdrom_device_info *cdi,
 			struct cdrom_multisession *ms_info)
 {
-	ms_info->addr.lba = scsi_CDs[minor(cdi->dev)].ms_offset;
-	ms_info->xa_flag = scsi_CDs[minor(cdi->dev)].xa_flag ||
-	    (scsi_CDs[minor(cdi->dev)].ms_offset > 0);
+	Scsi_CD *SCp = cdi->handle;
+
+	ms_info->addr.lba = SCp->ms_offset;
+	ms_info->xa_flag = SCp->xa_flag || SCp->ms_offset > 0;
 
 	return 0;
 }
 
 int sr_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
 {
+	Scsi_CD *SCp = cdi->handle;
 	u_char sr_cmd[10];
 	char buffer[32];
 	int result;
 
 	sr_cmd[0] = GPCMD_READ_SUBCHANNEL;
-	sr_cmd[1] = (scsi_CDs[minor(cdi->dev)].device->scsi_level <= SCSI_2) ?
-	            ((scsi_CDs[minor(cdi->dev)].device->lun) << 5) : 0;
+	sr_cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+	            ((SCp->device->lun) << 5) : 0;
 	sr_cmd[2] = 0x40;	/* I do want the subchannel info */
 	sr_cmd[3] = 0x02;	/* Give me medium catalog number info */
 	sr_cmd[4] = sr_cmd[5] = 0;
@@ -305,6 +312,7 @@ int sr_reset(struct cdrom_device_info *cdi)
 
 int sr_select_speed(struct cdrom_device_info *cdi, int speed)
 {
+	Scsi_CD *SCp = cdi->handle;
 	u_char sr_cmd[MAX_COMMAND_SIZE];
 
 	if (speed == 0)
@@ -314,8 +322,8 @@ int sr_select_speed(struct cdrom_device_info *cdi, int speed)
 
 	memset(sr_cmd, 0, MAX_COMMAND_SIZE);
 	sr_cmd[0] = GPCMD_SET_SPEED;	/* SET CD SPEED */
-	sr_cmd[1] = (scsi_CDs[minor(cdi->dev)].device->scsi_level <= SCSI_2) ?
-	            ((scsi_CDs[minor(cdi->dev)].device->lun) << 5) : 0;
+	sr_cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+	            ((SCp->device->lun) << 5) : 0;
 	sr_cmd[2] = (speed >> 8) & 0xff;	/* MSB for speed (in kbytes/sec) */
 	sr_cmd[3] = speed & 0xff;	/* LSB */
 
@@ -332,6 +340,7 @@ int sr_select_speed(struct cdrom_device_info *cdi, int speed)
 
 int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
 {
+	Scsi_CD *SCp = cdi->handle;
 	u_char sr_cmd[10];
 	int result, target = minor(cdi->dev);
 	unsigned char buffer[32];
@@ -344,8 +353,8 @@ int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
 			struct cdrom_tochdr *tochdr = (struct cdrom_tochdr *) arg;
 
 			sr_cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
-			sr_cmd[1] = (scsi_CDs[target].device->scsi_level <= SCSI_2) ?
-			            ((scsi_CDs[target].device->lun) << 5) : 0;
+			sr_cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+			            ((SCp->device->lun) << 5) : 0;
 			sr_cmd[2] = sr_cmd[3] = sr_cmd[4] = sr_cmd[5] = 0;
 			sr_cmd[8] = 12;		/* LSB of length */
 
@@ -362,8 +371,8 @@ int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
 			struct cdrom_tocentry *tocentry = (struct cdrom_tocentry *) arg;
 
 			sr_cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
-			sr_cmd[1] = (scsi_CDs[target].device->scsi_level <= SCSI_2) ?
-			            ((scsi_CDs[target].device->lun) << 5) : 0;
+			sr_cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+			            ((SCp->device->lun) << 5) : 0;
 			sr_cmd[1] |= (tocentry->cdte_format == CDROM_MSF) ? 0x02 : 0;
 			sr_cmd[2] = sr_cmd[3] = sr_cmd[4] = sr_cmd[5] = 0;
 			sr_cmd[6] = tocentry->cdte_track;
@@ -389,8 +398,8 @@ int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
 		struct cdrom_ti* ti = (struct cdrom_ti*)arg;
 
 		sr_cmd[0] = GPCMD_PLAYAUDIO_TI;
-		sr_cmd[1] = (scsi_CDs[target].device->scsi_level <= SCSI_2) ?
-		            (scsi_CDs[target].device->lun << 5) : 0;
+		sr_cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+		            (SCp->device->lun << 5) : 0;
 		sr_cmd[4] = ti->cdti_trk0;
 		sr_cmd[5] = ti->cdti_ind0;
 		sr_cmd[7] = ti->cdti_trk1;
@@ -432,6 +441,7 @@ int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
 int sr_read_cd(int minor, unsigned char *dest, int lba, int format, int blksize)
 {
 	unsigned char cmd[MAX_COMMAND_SIZE];
+	Scsi_CD *SCp = &scsi_CDs[minor];
 
 #ifdef DEBUG
 	printk("sr%d: sr_read_cd lba=%d format=%d blksize=%d\n",
@@ -440,8 +450,8 @@ int sr_read_cd(int minor, unsigned char *dest, int lba, int format, int blksize)
 
 	memset(cmd, 0, MAX_COMMAND_SIZE);
 	cmd[0] = GPCMD_READ_CD;	/* READ_CD */
-	cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-	         (scsi_CDs[minor].device->lun << 5) : 0;
+	cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+	         (SCp->device->lun << 5) : 0;
 	cmd[1] |= ((format & 7) << 2);
 	cmd[2] = (unsigned char) (lba >> 24) & 0xff;
 	cmd[3] = (unsigned char) (lba >> 16) & 0xff;
@@ -472,19 +482,20 @@ int sr_read_cd(int minor, unsigned char *dest, int lba, int format, int blksize)
 int sr_read_sector(int minor, int lba, int blksize, unsigned char *dest)
 {
 	unsigned char cmd[MAX_COMMAND_SIZE];	/* the scsi-command */
+	Scsi_CD *SCp = &scsi_CDs[minor];
 	int rc;
 
 	/* we try the READ CD command first... */
-	if (scsi_CDs[minor].readcd_known) {
+	if (SCp->readcd_known) {
 		rc = sr_read_cd(minor, dest, lba, 0, blksize);
 		if (-EDRIVE_CANT_DO_THIS != rc)
 			return rc;
-		scsi_CDs[minor].readcd_known = 0;
+		SCp->readcd_known = 0;
 		printk("CDROM does'nt support READ CD (0xbe) command\n");
 		/* fall & retry the other way */
 	}
 	/* ... if this fails, we switch the blocksize using MODE SELECT */
-	if (blksize != scsi_CDs[minor].device->sector_size) {
+	if (blksize != SCp->device->sector_size) {
 		if (0 != (rc = sr_set_blocklength(minor, blksize)))
 			return rc;
 	}
@@ -494,8 +505,8 @@ int sr_read_sector(int minor, int lba, int blksize, unsigned char *dest)
 
 	memset(cmd, 0, MAX_COMMAND_SIZE);
 	cmd[0] = GPCMD_READ_10;
-	cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-	         (scsi_CDs[minor].device->lun << 5) : 0;
+	cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+	         (SCp->device->lun << 5) : 0;
 	cmd[2] = (unsigned char) (lba >> 24) & 0xff;
 	cmd[3] = (unsigned char) (lba >> 16) & 0xff;
 	cmd[4] = (unsigned char) (lba >> 8) & 0xff;
@@ -514,6 +525,7 @@ int sr_read_sector(int minor, int lba, int blksize, unsigned char *dest)
 int sr_is_xa(int minor)
 {
 	unsigned char *raw_sector;
+	Scsi_CD *SCp = &scsi_CDs[minor];
 	int is_xa;
 
 	if (!xa_test)
@@ -522,7 +534,7 @@ int sr_is_xa(int minor)
 	raw_sector = (unsigned char *) kmalloc(2048, GFP_DMA | GFP_KERNEL);
 	if (!raw_sector)
 		return -ENOMEM;
-	if (0 == sr_read_sector(minor, scsi_CDs[minor].ms_offset + 16,
+	if (0 == sr_read_sector(minor, SCp->ms_offset + 16,
 				CD_FRAMESIZE_RAW1, raw_sector)) {
 		is_xa = (raw_sector[3] == 0x02) ? 1 : 0;
 	} else {
@@ -539,18 +551,16 @@ int sr_is_xa(int minor)
 int sr_dev_ioctl(struct cdrom_device_info *cdi,
 		 unsigned int cmd, unsigned long arg)
 {
-	int target;
-
-	target = minor(cdi->dev);
+	Scsi_CD *SCp = cdi->handle;
 
 	switch (cmd) {
 	case BLKGETSIZE:
-		return put_user(scsi_CDs[target].capacity, (unsigned long *) arg);
+		return put_user(SCp->capacity, (unsigned long *) arg);
 	case BLKGETSIZE64:
-		return put_user((u64)scsi_CDs[target].capacity << 9, (u64 *)arg);
+		return put_user((u64)SCp->capacity << 9, (u64 *)arg);
 
 	default:
-		return scsi_ioctl(scsi_CDs[target].device, cmd, (void *) arg);
+		return scsi_ioctl(SCp->device, cmd, (void *)arg);
 	}
 }
 

drivers/scsi/sr_vendor.c

@@ -58,27 +58,25 @@
 #define VENDOR_TOSHIBA         3
 #define VENDOR_WRITER          4	/* pre-scsi3 writers */
 
-#define VENDOR_ID (scsi_CDs[minor].vendor)
-
-void sr_vendor_init(int minor)
+void sr_vendor_init(Scsi_CD *SCp)
 {
 #ifndef CONFIG_BLK_DEV_SR_VENDOR
-	VENDOR_ID = VENDOR_SCSI3;
+	SCp->vendor = VENDOR_SCSI3;
 #else
-	char *vendor = scsi_CDs[minor].device->vendor;
-	char *model = scsi_CDs[minor].device->model;
-
+	char *vendor = SCp->device->vendor;
+	char *model = SCp->device->model;
+	
 	/* default */
-	VENDOR_ID = VENDOR_SCSI3;
-	if (scsi_CDs[minor].readcd_known)
+	SCp->vendor = VENDOR_SCSI3;
+	if (SCp->readcd_known)
 		/* this is true for scsi3/mmc drives - no more checks */
 		return;
 
-	if (scsi_CDs[minor].device->type == TYPE_WORM) {
-		VENDOR_ID = VENDOR_WRITER;
+	if (SCp->device->type == TYPE_WORM) {
+		SCp->vendor = VENDOR_WRITER;
 
 	} else if (!strncmp(vendor, "NEC", 3)) {
-		VENDOR_ID = VENDOR_NEC;
+		SCp->vendor = VENDOR_NEC;
 		if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
 		    !strncmp(model, "CD-ROM DRIVE:36", 15) ||
 		    !strncmp(model, "CD-ROM DRIVE:83", 15) ||
@@ -90,10 +88,10 @@ void sr_vendor_init(int minor)
 #endif
 		    )
 			/* these can't handle multisession, may hang */
-			scsi_CDs[minor].cdi.mask |= CDC_MULTI_SESSION;
+			SCp->cdi.mask |= CDC_MULTI_SESSION;
 
 	} else if (!strncmp(vendor, "TOSHIBA", 7)) {
-		VENDOR_ID = VENDOR_TOSHIBA;
+		SCp->vendor = VENDOR_TOSHIBA;
 
 	}
 #endif
@@ -108,10 +106,11 @@ int sr_set_blocklength(int minor, int blocklength)
 	unsigned char *buffer;	/* the buffer for the ioctl */
 	unsigned char cmd[MAX_COMMAND_SIZE];	/* the scsi-command */
 	struct ccs_modesel_head *modesel;
+	Scsi_CD *SCp = &scsi_CDs[minor];
 	int rc, density = 0;
 
 #ifdef CONFIG_BLK_DEV_SR_VENDOR
-	if (VENDOR_ID == VENDOR_TOSHIBA)
+	if (SCp->vendor == VENDOR_TOSHIBA)
 		density = (blocklength > 2048) ? 0x81 : 0x83;
 #endif
 
@@ -124,8 +123,8 @@ int sr_set_blocklength(int minor, int blocklength)
 #endif
 	memset(cmd, 0, MAX_COMMAND_SIZE);
 	cmd[0] = MODE_SELECT;
-	cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-	         (scsi_CDs[minor].device->lun << 5) : 0;
+	cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+	         (SCp->device->lun << 5) : 0;
 	cmd[1] |= (1 << 4);
 	cmd[4] = 12;
 	modesel = (struct ccs_modesel_head *) buffer;
@@ -135,7 +134,7 @@ int sr_set_blocklength(int minor, int blocklength)
 	modesel->block_length_med = (blocklength >> 8) & 0xff;
 	modesel->block_length_lo = blocklength & 0xff;
 	if (0 == (rc = sr_do_ioctl(minor, cmd, buffer, sizeof(*modesel), 0, SCSI_DATA_WRITE, NULL))) {
-		scsi_CDs[minor].device->sector_size = blocklength;
+		SCp->device->sector_size = blocklength;
 	}
 #ifdef DEBUG
 	else
@@ -153,13 +152,14 @@ int sr_set_blocklength(int minor, int blocklength)
 
 int sr_cd_check(struct cdrom_device_info *cdi)
 {
+	Scsi_CD *SCp = cdi->handle;
 	unsigned long sector;
 	unsigned char *buffer;	/* the buffer for the ioctl */
 	unsigned char cmd[MAX_COMMAND_SIZE];	/* the scsi-command */
 	int rc, no_multi, minor;
 
 	minor = minor(cdi->dev);
-	if (scsi_CDs[minor].cdi.mask & CDC_MULTI_SESSION)
+	if (SCp->cdi.mask & CDC_MULTI_SESSION)
 		return 0;
 
 	buffer = (unsigned char *) kmalloc(512, GFP_KERNEL | GFP_DMA);
@@ -170,13 +170,13 @@ int sr_cd_check(struct cdrom_device_info *cdi)
 	no_multi = 0;		/* flag: the drive can't handle multisession */
 	rc = 0;
 
-	switch (VENDOR_ID) {
+	switch (SCp->vendor) {
 
 	case VENDOR_SCSI3:
 		memset(cmd, 0, MAX_COMMAND_SIZE);
 		cmd[0] = READ_TOC;
-		cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-		         (scsi_CDs[minor].device->lun << 5) : 0;
+		cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+		         (SCp->device->lun << 5) : 0;
 		cmd[8] = 12;
 		cmd[9] = 0x40;
 		rc = sr_do_ioctl(minor, cmd, buffer, 12, 1, SCSI_DATA_READ, NULL);
@@ -201,8 +201,8 @@ int sr_cd_check(struct cdrom_device_info *cdi)
 			unsigned long min, sec, frame;
 			memset(cmd, 0, MAX_COMMAND_SIZE);
 			cmd[0] = 0xde;
-			cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-			         (scsi_CDs[minor].device->lun << 5) : 0;
+			cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+			         (SCp->device->lun << 5) : 0;
 			cmd[1] |= 0x03;
 			cmd[2] = 0xb0;
 			rc = sr_do_ioctl(minor, cmd, buffer, 0x16, 1, SCSI_DATA_READ, NULL);
@@ -228,8 +228,8 @@ int sr_cd_check(struct cdrom_device_info *cdi)
 			 * where starts the last session ?) */
 			memset(cmd, 0, MAX_COMMAND_SIZE);
 			cmd[0] = 0xc7;
-			cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-			         (scsi_CDs[minor].device->lun << 5) : 0;
+			cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+			         (SCp->device->lun << 5) : 0;
 			cmd[1] |= 0x03;
 			rc = sr_do_ioctl(minor, cmd, buffer, 4, 1, SCSI_DATA_READ, NULL);
 			if (rc == -EINVAL) {
@@ -253,8 +253,8 @@ int sr_cd_check(struct cdrom_device_info *cdi)
 	case VENDOR_WRITER:
 		memset(cmd, 0, MAX_COMMAND_SIZE);
 		cmd[0] = READ_TOC;
-		cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-		         (scsi_CDs[minor].device->lun << 5) : 0;
+		cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+		         (SCp->device->lun << 5) : 0;
 		cmd[8] = 0x04;
 		cmd[9] = 0x40;
 		rc = sr_do_ioctl(minor, cmd, buffer, 0x04, 1, SCSI_DATA_READ, NULL);
@@ -267,8 +267,8 @@ int sr_cd_check(struct cdrom_device_info *cdi)
 			break;
 		}
 		cmd[0] = READ_TOC;	/* Read TOC */
-		cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?
-		         (scsi_CDs[minor].device->lun << 5) : 0;
+		cmd[1] = (SCp->device->scsi_level <= SCSI_2) ?
+		         (SCp->device->lun << 5) : 0;
 		cmd[6] = rc & 0x7f;	/* number of last session */
 		cmd[8] = 0x0c;
 		cmd[9] = 0x40;
@@ -285,17 +285,17 @@ int sr_cd_check(struct cdrom_device_info *cdi)
 		/* should not happen */
 		printk(KERN_WARNING
 		   "sr%d: unknown vendor code (%i), not initialized ?\n",
-		       minor, VENDOR_ID);
+		       minor, SCp->vendor);
 		sector = 0;
 		no_multi = 1;
 		break;
 	}
-	scsi_CDs[minor].ms_offset = sector;
-	scsi_CDs[minor].xa_flag = 0;
+	SCp->ms_offset = sector;
+	SCp->xa_flag = 0;
 	if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(minor))
-		scsi_CDs[minor].xa_flag = 1;
+		SCp->xa_flag = 1;
 
-	if (2048 != scsi_CDs[minor].device->sector_size) {
+	if (2048 != SCp->device->sector_size) {
 		sr_set_blocklength(minor, 2048);
 	}
 	if (no_multi)