[PATCH] raid autodetect for sun disk labels

[Alex Williamson <alex_williamson@attbi.com>]

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    I wasn't terribly fond of the idea of needing an initrd or weird
boot options to support root raid on a sparc, so I hacked on the sun
disk label support a bit to pass "Linux raid autodetect" partitions
up to md.  The extra breakout of the disk label struct is from the fdisk
source, hopefully it's not obsolete.  With this I can boot to a root
raid0 on a sparc 10, but it should of course work on any set of disks w/
proper magic.  Patch attached for 2.4.20-pre7/8.  Please CC on followup.
Thanks,

	Alex Williamson

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--- linux-2.4.19/fs/partitions/sun.c~	Tue Sep 24 23:02:49 2002
+++ linux-2.4.19/fs/partitions/sun.c	Wed Sep 25 20:45:05 2002
@@ -19,6 +19,10 @@
 #include "check.h"
 #include "sun.h"
 
+#if CONFIG_BLK_DEV_MD
+extern void md_autodetect_dev(kdev_t dev);
+#endif
+
 int sun_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int first_part_minor)
 {
 	int i, csum;
@@ -27,7 +31,14 @@
 	kdev_t dev = to_kdev_t(bdev->bd_dev);
 	struct sun_disklabel {
 		unsigned char info[128];   /* Informative text string */
-		unsigned char spare[292];  /* Boot information etc. */
+		unsigned char spare0[14];
+		struct sun_info {
+			unsigned char spare1;
+			unsigned char id;
+			unsigned char spare2;
+			unsigned char flags;
+		} infos[8];
+		unsigned char spare[246];  /* Boot information etc. */
 		unsigned short rspeed;     /* Disk rotational speed */
 		unsigned short pcylcount;  /* Physical cylinder count */
 		unsigned short sparecyl;   /* extra sects per cylinder */
@@ -69,6 +80,7 @@
 		put_dev_sector(sect);
 		return 0;
 	}
+
 	/* All Sun disks have 8 partition entries */
 	spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
 	for(i=0; i < 8; i++, p++) {
@@ -77,8 +89,14 @@
 
 		st_sector = first_sector + be32_to_cpu(p->start_cylinder) * spc;
 		num_sectors = be32_to_cpu(p->num_sectors);
-		if (num_sectors)
+		if (num_sectors) {
 			add_gd_partition(hd, first_part_minor, st_sector, num_sectors);
+#if CONFIG_BLK_DEV_MD
+			if (label->infos[i].id == 0xfd) { /* "Linux raid autodetect" */
+				md_autodetect_dev(MKDEV(hd->major, first_part_minor));
+			}
+#endif
+		}
 		first_part_minor++;
 	}
 	printk("\n");