1 files changed, 134 insertions, 0 deletions

diff --git a/block/partitions/mac.c b/block/partitions/mac.c
new file mode 100644
index 000000000000..11f688bd76c5
--- /dev/null
+++ b/block/partitions/mac.c
@@ -0,0 +1,134 @@
+/*
+ *  fs/partitions/mac.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/ctype.h>
+#include "check.h"
+#include "mac.h"
+
+#ifdef CONFIG_PPC_PMAC
+#include <asm/machdep.h>
+extern void note_bootable_part(dev_t dev, int part, int goodness);
+#endif
+
+/*
+ * Code to understand MacOS partition tables.
+ */
+
+static inline void mac_fix_string(char *stg, int len)
+{
+        int i;
+
+        for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
+                stg[i] = 0;
+}
+
+int mac_partition(struct parsed_partitions *state)
+{
+        Sector sect;
+        unsigned char *data;
+        int slot, blocks_in_map;
+        unsigned secsize;
+#ifdef CONFIG_PPC_PMAC
+        int found_root = 0;
+        int found_root_goodness = 0;
+#endif
+        struct mac_partition *part;
+        struct mac_driver_desc *md;
+
+        /* Get 0th block and look at the first partition map entry. */
+        md = read_part_sector(state, 0, &sect);
+        if (!md)
+                return -1;
+        if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        secsize = be16_to_cpu(md->block_size);
+        put_dev_sector(sect);
+        data = read_part_sector(state, secsize/512, &sect);
+        if (!data)
+                return -1;
+        part = (struct mac_partition *) (data + secsize%512);
+        if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
+                put_dev_sector(sect);
+                return 0;               /* not a MacOS disk */
+        }
+        blocks_in_map = be32_to_cpu(part->map_count);
+        if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
+        for (slot = 1; slot <= blocks_in_map; ++slot) {
+                int pos = slot * secsize;
+                put_dev_sector(sect);
+                data = read_part_sector(state, pos/512, &sect);
+                if (!data)
+                        return -1;
+                part = (struct mac_partition *) (data + pos%512);
+                if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
+                        break;
+                put_partition(state, slot,
+                        be32_to_cpu(part->start_block) * (secsize/512),
+                        be32_to_cpu(part->block_count) * (secsize/512));
+
+                if (!strnicmp(part->type, "Linux_RAID", 10))
+                        state->parts[slot].flags = ADDPART_FLAG_RAID;
+#ifdef CONFIG_PPC_PMAC
+                /*
+                 * If this is the first bootable partition, tell the
+                 * setup code, in case it wants to make this the root.
+                 */
+                if (machine_is(powermac)) {
+                        int goodness = 0;
+
+                        mac_fix_string(part->processor, 16);
+                        mac_fix_string(part->name, 32);
+                        mac_fix_string(part->type, 32);                                 
+                    
+                        if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
+                            && strcasecmp(part->processor, "powerpc") == 0)
+                                goodness++;
+
+                        if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
+                            || (strnicmp(part->type, "Linux", 5) == 0
+                                && strcasecmp(part->type, "Linux_swap") != 0)) {
+                                int i, l;
+
+                                goodness++;
+                                l = strlen(part->name);
+                                if (strcmp(part->name, "/") == 0)
+                                        goodness++;
+                                for (i = 0; i <= l - 4; ++i) {
+                                        if (strnicmp(part->name + i, "root",
+                                                     4) == 0) {
+                                                goodness += 2;
+                                                break;
+                                        }
+                                }
+                                if (strnicmp(part->name, "swap", 4) == 0)
+                                        goodness--;
+                        }
+
+                        if (goodness > found_root_goodness) {
+                                found_root = slot;
+                                found_root_goodness = goodness;
+                        }
+                }
+#endif /* CONFIG_PPC_PMAC */
+        }
+#ifdef CONFIG_PPC_PMAC
+        if (found_root_goodness)
+                note_bootable_part(state->bdev->bd_dev, found_root,
+                                   found_root_goodness);
+#endif
+
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}