1 files changed, 91 insertions, 0 deletions
diff --git a/fs/partitions/sun.c b/fs/partitions/sun.c
new file mode 100644
index 000000000000..abe91ca03edf
--- /dev/null
+++ b/fs/partitions/sun.c
@@ -0,0 +1,91 @@
+/*
+ *  fs/partitions/sun.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include "check.h"
+#include "sun.h"
+
+int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+	int i;
+	__be16 csum;
+	int slot = 1;
+	__be16 *ush;
+	Sector sect;
+	struct sun_disklabel {
+		unsigned char info[128];   /* Informative text string */
+		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. */
+		__be16 rspeed;     /* Disk rotational speed */
+		__be16 pcylcount;  /* Physical cylinder count */
+		__be16 sparecyl;   /* extra sects per cylinder */
+		unsigned char spare2[4];   /* More magic... */
+		__be16 ilfact;     /* Interleave factor */
+		__be16 ncyl;       /* Data cylinder count */
+		__be16 nacyl;      /* Alt. cylinder count */
+		__be16 ntrks;      /* Tracks per cylinder */
+		__be16 nsect;      /* Sectors per track */
+		unsigned char spare3[4];   /* Even more magic... */
+		struct sun_partition {
+			__be32 start_cylinder;
+			__be32 num_sectors;
+		} partitions[8];
+		__be16 magic;      /* Magic number */
+		__be16 csum;       /* Label xor'd checksum */
+	} * label;		
+	struct sun_partition *p;
+	unsigned long spc;
+	char b[BDEVNAME_SIZE];
+
+	label = (struct sun_disklabel *)read_dev_sector(bdev, 0, &sect);
+	if (!label)
+		return -1;
+
+	p = label->partitions;
+	if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
+/*		printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
+		       bdevname(bdev, b), be16_to_cpu(label->magic)); */
+		put_dev_sector(sect);
+		return 0;
+	}
+	/* Look at the checksum */
+	ush = ((__be16 *) (label+1)) - 1;
+	for (csum = 0; ush >= ((__be16 *) label);)
+		csum ^= *ush--;
+	if (csum) {
+		printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
+		       bdevname(bdev, b));
+		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++) {
+		unsigned long st_sector;
+		int num_sectors;
+
+		st_sector = be32_to_cpu(p->start_cylinder) * spc;
+		num_sectors = be32_to_cpu(p->num_sectors);
+		if (num_sectors) {
+			put_partition(state, slot, st_sector, num_sectors);
+			if (label->infos[i].id == LINUX_RAID_PARTITION)
+				state->parts[slot].flags = 1;
+		}
+		slot++;
+	}
+	printk("\n");
+	put_dev_sector(sect);
+	return 1;
+}