[PATCH] partitions: Read Rio Karma partition table

The Rio Karma portable MP3 player has its own proprietary partition table.

The partition layout is similar to a DOS boot sector but it begins at a
different offset and uses a different magic number (0xAB56 instead of
0xAA55).  Add support for it to enable mounting the device.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/fs/partitions/karma.c b/fs/partitions/karma.c
new file mode 100644
index 000000000000..176d89bcf123
--- /dev/null
+++ b/fs/partitions/karma.c
@@ -0,0 +1,57 @@
+/*
+ *  fs/partitions/karma.c
+ *  Rio Karma partition info.
+ *
+ *  Copyright (C) 2006 Bob Copeland (me@bobcopeland.com)
+ *  based on osf.c
+ */
+
+#include "check.h"
+#include "karma.h"
+
+int karma_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+        int i;
+        int slot = 1;
+        Sector sect;
+        unsigned char *data;
+        struct disklabel {
+                u8 d_reserved[270];
+                struct d_partition {
+                        __le32 p_res;
+                        u8 p_fstype;
+                        u8 p_res2[3];
+                        __le32 p_offset;
+                        __le32 p_size;
+                } d_partitions[2];
+                u8 d_blank[208];
+                __le16 d_magic;
+        } __attribute__((packed)) *label;
+        struct d_partition *p;
+
+        data = read_dev_sector(bdev, 0, &sect);
+        if (!data)
+                return -1;
+
+        label = (struct disklabel *)data;
+        if (le16_to_cpu(label->d_magic) != KARMA_LABEL_MAGIC) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        p = label->d_partitions;
+        for (i = 0 ; i < 2; i++, p++) {
+                if (slot == state->limit)
+                        break;
+
+                if (p->p_fstype == 0x4d && le32_to_cpu(p->p_size)) {
+                        put_partition(state, slot, le32_to_cpu(p->p_offset),
+                                le32_to_cpu(p->p_size));
+                }
+                slot++;
+        }
+        printk("\n");
+        put_dev_sector(sect);
+        return 1;
+}
+