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Subject[PATCH] partitions: Read Rio Karma boot sector
The Rio Karma has a proprietary boot sector with an MSDOS-like partition
table. Add support for it to enable mounting of the device.

Signed-off-by: Bob Copeland <me@bobcopeland.com>

---

(I don't know who, if anyone, owns fs/partitions and MAINTAINERS didn't
seem clear on that point.)

fs/partitions/Kconfig | 7 ++++++
fs/partitions/Makefile | 1 +
fs/partitions/check.c | 4 +++
fs/partitions/karma.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/partitions/karma.h | 8 +++++++
5 files changed, 77 insertions(+), 0 deletions(-)
create mode 100644 fs/partitions/karma.c
create mode 100644 fs/partitions/karma.h

applies-to: 3f92a0ea6d1780823f2c56e512942bcc6e7817ef
37c5c6803376f54306a7690bfb99c96cff5534de
diff --git a/fs/partitions/Kconfig b/fs/partitions/Kconfig
index deb25b6..f916ef1 100644
--- a/fs/partitions/Kconfig
+++ b/fs/partitions/Kconfig
@@ -225,4 +225,11 @@ config EFI_PARTITION
were partitioned using EFI GPT. Presently only useful on the
IA-64 platform.

+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.
+
# define_bool CONFIG_ACORN_PARTITION_CUMANA y
diff --git a/fs/partitions/Makefile b/fs/partitions/Makefile
index 66d5cc2..42c7d38 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 8dc1822..ac10938 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
#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 0000000..b4f5fed
--- /dev/null
+++ b/fs/partitions/karma.c
@@ -0,0 +1,57 @@
+/*
+ * fs/partitions/karma.c
+ * Rio Karma partition info.
+ *
+ * Copyright (C) 2005 Bob Copeland (me@bobcopeland.com)
+ * based on ofs.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 reserved[270];
+ struct d_partition {
+ __le32 res;
+ u8 fstype;
+ u8 res2[3];
+ __le32 offset;
+ __le32 size;
+ } partitions[2];
+ u8 blank[208];
+ __le16 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->magic) != KARMA_LABEL_MAGIC) {
+ put_dev_sector(sect);
+ return 0;
+ }
+
+ p = label->partitions;
+ for (i = 0 ; i < 2; i++, p++) {
+ if (slot == state->limit)
+ break;
+
+ if (p->fstype == 0x4d && le32_to_cpu(p->size)) {
+ put_partition(state, slot, le32_to_cpu(p->offset),
+ le32_to_cpu(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 0000000..ecf7d3f
--- /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);
+
---
0.99.9i
--
Bob Copeland %% www.bobcopeland.com
-
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