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

• Lines: 111
• Date: Thu Aug 12 12:26:06 1999
• Orig file: v2.3.13/linux/fs/partitions/mac.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.13/linux/fs/partitions/mac.c linux/fs/partitions/mac.c
@@ -0,0 +1,110 @@
+/*
+ *  fs/partitions/msdos.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/config.h>
+#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 <linux/ctype.h>
+
+#include <asm/system.h>
+
+#include "check.h"
+#include "mac.h"
+
+#ifdef CONFIG_PPC
+extern void note_bootable_part(kdev_t dev, int part);
+#endif
+
+/*
+ * Code to understand MacOS partition tables.
+ */
+
+int mac_partition(struct gendisk *hd, kdev_t dev, unsigned long fsec, int first_part_minor)
+{
+	struct buffer_head *bh;
+	int blk, blocks_in_map;
+	int dev_bsize, dev_pos, pos;
+	unsigned secsize;
+#ifdef CONFIG_PPC
+	int first_bootable = 1;
+#endif
+	struct mac_partition *part;
+	struct mac_driver_desc *md;
+
+	dev_bsize = get_ptable_blocksize(dev);
+	dev_pos = 0;
+	/* Get 0th block and look at the first partition map entry. */
+	if ((bh = bread(dev, 0, dev_bsize)) == 0) {
+	    printk("%s: error reading partition table\n",
+		   kdevname(dev));
+	    return -1;
+	}
+	md = (struct mac_driver_desc *) bh->b_data;
+	if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
+		brelse(bh);
+		return 0;
+	}
+	secsize = be16_to_cpu(md->block_size);
+	if (secsize >= dev_bsize) {
+		brelse(bh);
+		dev_pos = secsize;
+		if ((bh = bread(dev, secsize/dev_bsize, dev_bsize)) == 0) {
+			printk("%s: error reading partition table\n",
+			       kdevname(dev));
+			return -1;
+		}
+	}
+	part = (struct mac_partition *) (bh->b_data + secsize - dev_pos);
+	if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
+		brelse(bh);
+		return 0;		/* not a MacOS disk */
+	}
+	blocks_in_map = be32_to_cpu(part->map_count);
+	for (blk = 1; blk <= blocks_in_map; ++blk) {
+		pos = blk * secsize;
+		if (pos >= dev_pos + dev_bsize) {
+			brelse(bh);
+			dev_pos = pos;
+			if ((bh = bread(dev, pos/dev_bsize, dev_bsize)) == 0) {
+				printk("%s: error reading partition table\n",
+				       kdevname(dev));
+				return -1;
+			}
+		}
+		part = (struct mac_partition *) (bh->b_data + pos - dev_pos);
+		if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
+			break;
+		blocks_in_map = be32_to_cpu(part->map_count);
+		add_gd_partition(hd, first_part_minor,
+			fsec + be32_to_cpu(part->start_block) * (secsize/512),
+			be32_to_cpu(part->block_count) * (secsize/512));
+
+#ifdef CONFIG_PPC
+		/*
+		 * If this is the first bootable partition, tell the
+		 * setup code, in case it wants to make this the root.
+		 */
+		if ( (_machine == _MACH_Pmac) && first_bootable
+		    && (be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
+		    && strcasecmp(part->processor, "powerpc") == 0) {
+			note_bootable_part(dev, blk);
+			first_bootable = 0;
+		}
+#endif /* CONFIG_PPC */
+
+		++first_part_minor;
+	}
+	brelse(bh);
+	printk("\n");
+	return 1;
+}
+