[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>

5 files changed, 77 insertions, 0 deletions

diff --git a/fs/partitions/Kconfig b/fs/partitions/Kconfig
index 7490cc9208b3..c9a478099281 100644
--- a/fs/partitions/Kconfig
+++ b/fs/partitions/Kconfig
@@ -222,6 +222,13 @@ config SUN_PARTITION
           given by the tar program ("man tar" or preferably "info tar"). If
           you don't know what all this is about, say N.
 
+config KARMA_PARTITION
+        bool "Karma Partition support"
+        depends on PARTITION_ADVANCED
+        help
+          Say Y here if you would like to mount the Rio Karma MP3 player, as it
+          uses a proprietary partition table.
+
 config EFI_PARTITION
         bool "EFI GUID Partition support"
         depends on PARTITION_ADVANCED
diff --git a/fs/partitions/Makefile b/fs/partitions/Makefile
index 66d5cc26fafb..42c7d3878ed0 100644
--- a/fs/partitions/Makefile
+++ b/fs/partitions/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_SUN_PARTITION) += sun.o
 obj-$(CONFIG_ULTRIX_PARTITION) += ultrix.o
 obj-$(CONFIG_IBM_PARTITION) += ibm.o
 obj-$(CONFIG_EFI_PARTITION) += efi.o
+obj-$(CONFIG_KARMA_PARTITION) += karma.o
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 7881ce05daef..f924f459bdb8 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -35,6 +35,7 @@
 #include "ibm.h"
 #include "ultrix.h"
 #include "efi.h"
+#include "karma.h"
 
 #ifdef CONFIG_BLK_DEV_MD
 extern void md_autodetect_dev(dev_t dev);
@@ -103,6 +104,9 @@ static int (*check_part[])(struct parsed_partitions *, struct block_device *) =
 #ifdef CONFIG_IBM_PARTITION
         ibm_partition,
 #endif
+#ifdef CONFIG_KARMA_PARTITION
+        karma_partition,
+#endif
         NULL
 };
  
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;
+}
+
diff --git a/fs/partitions/karma.h b/fs/partitions/karma.h
new file mode 100644
index 000000000000..ecf7d3f2a3d8
--- /dev/null
+++ b/fs/partitions/karma.h
@@ -0,0 +1,8 @@
+/*
+ *  fs/partitions/karma.h
+ */
+
+#define KARMA_LABEL_MAGIC               0xAB56
+
+int karma_partition(struct parsed_partitions *state, struct block_device *bdev);
+