Re: [PATCH] 2.6.2, Partition support for SCSI CDROM...

[Steven J. Hill]

Here is the second try at the patch.

-Steve
diff -urN linux-2.6.2/drivers/scsi/sr.c linux-2.6.2-patched/drivers/scsi/sr.c
--- linux-2.6.2/drivers/scsi/sr.c	2004-02-22 20:15:08.000000000 -0500
+++ linux-2.6.2-patched/drivers/scsi/sr.c	2004-02-24 11:48:16.000000000 -0500
@@ -55,6 +55,23 @@
 #include "scsi_logging.h"
 #include "sr.h"
 
+/*
+ * Device node mappings are as follows:
+ *
+ *    sr0 - first CDROM, whole disk
+ *    sr1 - first CDROM, first partition
+ *
+ *    [...]
+ *
+ *    sr16 - first CDROM, sixteenth partition
+ *    sr17 - second CDROM, whole disk
+ *    sr18 - second CDROM, first partition
+ *
+ *    [...]
+ */
+static int partitions = 16;
+MODULE_PARM(partitions, "i");
+MODULE_PARM_DESC(partitions, "number of SCSI CDROM partitions to support");
 
 MODULE_PARM(xa_test, "i");	/* see sr_ioctl.c */
 
@@ -518,7 +535,7 @@
 		goto fail;
 	memset(cd, 0, sizeof(*cd));
 
-	disk = alloc_disk(1);
+	disk = alloc_disk(partitions + 1);
 	if (!disk)
 		goto fail_free;
 
@@ -533,7 +550,7 @@
 	spin_unlock(&sr_index_lock);
 
 	disk->major = SCSI_CDROM_MAJOR;
-	disk->first_minor = minor;
+	disk->first_minor = minor * (partitions + 1);
 	sprintf(disk->disk_name, "sr%d", minor);
 	disk->fops = &sr_bdops;
 	disk->flags = GENHD_FL_CD;
@@ -868,6 +885,10 @@
 {
 	int rc;
 
+	/* Check number of partitions specified. */
+	if (partitions < 0)
+		partitions = 0;
+
 	rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
 	if (rc)
 		return rc;