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
--- 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");
-
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This archive was generated by hypermail 2b29 : Mon Sep 30 2002 - 22:00:25 EST