patch-2.3.14 linux/fs/partitions/sun.c

• Lines: 90
• Date: Thu Aug 12 12:26:06 1999
• Orig file: v2.3.13/linux/fs/partitions/sun.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.13/linux/fs/partitions/sun.c linux/fs/partitions/sun.c
@@ -0,0 +1,89 @@
+/*
+ *  fs/partitions/sun.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/blk.h>
+
+#include <asm/system.h>
+
+#include "check.h"
+#include "sun.h"
+
+int sun_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector, int first_part_minor)
+{
+	int i, csum;
+	unsigned short *ush;
+	struct buffer_head *bh;
+	struct sun_disklabel {
+		unsigned char info[128];   /* Informative text string */
+		unsigned char spare[292];  /* Boot information etc. */
+		unsigned short rspeed;     /* Disk rotational speed */
+		unsigned short pcylcount;  /* Physical cylinder count */
+		unsigned short sparecyl;   /* extra sects per cylinder */
+		unsigned char spare2[4];   /* More magic... */
+		unsigned short ilfact;     /* Interleave factor */
+		unsigned short ncyl;       /* Data cylinder count */
+		unsigned short nacyl;      /* Alt. cylinder count */
+		unsigned short ntrks;      /* Tracks per cylinder */
+		unsigned short nsect;      /* Sectors per track */
+		unsigned char spare3[4];   /* Even more magic... */
+		struct sun_partition {
+			__u32 start_cylinder;
+			__u32 num_sectors;
+		} partitions[8];
+		unsigned short magic;      /* Magic number */
+		unsigned short csum;       /* Label xor'd checksum */
+	} * label;		
+	struct sun_partition *p;
+	unsigned long spc;
+
+	if(!(bh = bread(dev, 0, get_ptable_blocksize(dev)))) {
+		printk("Dev %s: unable to read partition table\n",
+		       kdevname(dev));
+		return -1;
+	}
+	label = (struct sun_disklabel *) bh->b_data;
+	p = label->partitions;
+	if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
+		printk("Dev %s Sun disklabel: bad magic %04x\n",
+		       kdevname(dev), be16_to_cpu(label->magic));
+		brelse(bh);
+		return 0;
+	}
+	/* Look at the checksum */
+	ush = ((unsigned short *) (label+1)) - 1;
+	for(csum = 0; ush >= ((unsigned short *) label);)
+		csum ^= *ush--;
+	if(csum) {
+		printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
+		       kdevname(dev));
+		brelse(bh);
+		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 = first_sector + be32_to_cpu(p->start_cylinder) * spc;
+		num_sectors = be32_to_cpu(p->num_sectors);
+		if (num_sectors)
+			add_gd_partition(hd, first_part_minor, st_sector, num_sectors);
+		first_part_minor++;
+	}
+	printk("\n");
+	brelse(bh);
+	return 1;
+}
+