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openwrt-xburst/target/linux/rb532-2.6/patches/130-custom_partitions.patch

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diff -urN linux.old/fs/partitions/check.c linux.dev/fs/partitions/check.c
--- linux.old/fs/partitions/check.c 2006-05-31 02:31:44.000000000 +0200
+++ linux.dev/fs/partitions/check.c 2006-06-15 01:27:17.000000000 +0200
@@ -29,6 +29,7 @@
#include "ldm.h"
#include "mac.h"
#include "msdos.h"
+#include "openwrt.h"
#include "osf.h"
#include "sgi.h"
#include "sun.h"
@@ -48,6 +49,9 @@
* Probe partition formats with tables at disk address 0
* that also have an ADFS boot block at 0xdc0.
*/
+#ifdef CONFIG_OPENWRT_PARTITION
+ openwrt_partition,
+#endif
#ifdef CONFIG_ACORN_PARTITION_ICS
adfspart_check_ICS,
#endif
diff -urN linux.old/fs/partitions/Kconfig linux.dev/fs/partitions/Kconfig
--- linux.old/fs/partitions/Kconfig 2006-05-31 02:31:44.000000000 +0200
+++ linux.dev/fs/partitions/Kconfig 2006-06-15 01:27:17.000000000 +0200
@@ -14,6 +14,12 @@
If unsure, say N.
+config OPENWRT_PARTITION
+ bool "OpenWrt partition support" if PARTITION_ADVANCED
+ default y
+ help
+ Support the custom OpenWrt partition map
+
config ACORN_PARTITION
bool "Acorn partition support" if PARTITION_ADVANCED
default y if ARCH_ACORN
diff -urN linux.old/fs/partitions/Makefile linux.dev/fs/partitions/Makefile
--- linux.old/fs/partitions/Makefile 2006-05-31 02:31:44.000000000 +0200
+++ linux.dev/fs/partitions/Makefile 2006-06-15 01:27:17.000000000 +0200
@@ -11,6 +11,7 @@
obj-$(CONFIG_MAC_PARTITION) += mac.o
obj-$(CONFIG_LDM_PARTITION) += ldm.o
obj-$(CONFIG_MSDOS_PARTITION) += msdos.o
+obj-$(CONFIG_OPENWRT_PARTITION) += openwrt.o
obj-$(CONFIG_OSF_PARTITION) += osf.o
obj-$(CONFIG_SGI_PARTITION) += sgi.o
obj-$(CONFIG_SUN_PARTITION) += sun.o
diff -urN linux.old/fs/partitions/openwrt.c linux.dev/fs/partitions/openwrt.c
--- linux.old/fs/partitions/openwrt.c 1970-01-01 01:00:00.000000000 +0100
+++ linux.dev/fs/partitions/openwrt.c 2006-06-15 01:27:17.000000000 +0200
@@ -0,0 +1,249 @@
+/*
+ * fs/partitions/openwrt.c
+ *
+ * Code extracted from drivers/block/genhd.c
+ * and fs/partitions/msdos.c
+ *
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 1991-1998 Linus Torvalds
+ *
+ * Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ * in the early extended-partition checks and added DM partitions
+ *
+ * Support for DiskManager v6.0x added by Mark Lord,
+ * with information provided by OnTrack. This now works for linux fdisk
+ * and LILO, as well as loadlin and bootln. Note that disks other than
+ * /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1).
+ *
+ * More flexible handling of extended partitions - aeb, 950831
+ *
+ * Check partition table on IDE disks for common CHS translations
+ *
+ * Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/config.h>
+
+#include "check.h"
+#include "openwrt.h"
+
+/*
+ * Many architectures don't like unaligned accesses, while
+ * the nr_sects and start_sect partition table entries are
+ * at a 2 (mod 4) address.
+ */
+#include <asm/unaligned.h>
+
+#define SYS_IND(p) (get_unaligned(&p->sys_ind))
+#define NR_SECTS(p) ({ __typeof__(p->nr_sects) __a = \
+ get_unaligned(&p->nr_sects); \
+ le32_to_cpu(__a); \
+ })
+
+#define START_SECT(p) ({ __typeof__(p->start_sect) __a = \
+ get_unaligned(&p->start_sect); \
+ le32_to_cpu(__a); \
+ })
+
+static inline int is_extended_partition(struct partition *p)
+{
+ return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
+ SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
+ SYS_IND(p) == LINUX_EXTENDED_PARTITION);
+}
+
+#define MSDOS_LABEL_MAGIC1 0x55
+#define MSDOS_LABEL_MAGIC2 0xAA
+
+static inline int
+msdos_magic_present(unsigned char *p)
+{
+ return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
+}
+
+static inline int
+openwrt_magic_present(unsigned char *p)
+{
+ return (p[0] == 'O' &&
+ p[1] == 'W' &&
+ p[2] == 'R' &&
+ p[3] == 'T');
+}
+
+/*
+ * Create devices for each logical partition in an extended partition.
+ * The logical partitions form a linked list, with each entry being
+ * a partition table with two entries. The first entry
+ * is the real data partition (with a start relative to the partition
+ * table start). The second is a pointer to the next logical partition
+ * (with a start relative to the entire extended partition).
+ * We do not create a Linux partition for the partition tables, but
+ * only for the actual data partitions.
+ */
+
+static void
+parse_extended(struct parsed_partitions *state, struct block_device *bdev,
+ u32 first_sector, u32 first_size)
+{
+ struct partition *p;
+ Sector sect;
+ unsigned char *data;
+ u32 this_sector, this_size;
+ int sector_size = bdev_hardsect_size(bdev) / 512;
+ int loopct = 0; /* number of links followed
+ without finding a data partition */
+ int i;
+
+ this_sector = first_sector;
+ this_size = first_size;
+
+ while (1) {
+ if (++loopct > 100)
+ return;
+ if (state->next == state->limit)
+ return;
+ data = read_dev_sector(bdev, this_sector, &sect);
+ if (!data)
+ return;
+
+ if (!msdos_magic_present(data + 510))
+ goto done;
+
+ p = (struct partition *) (data + 0x1be);
+
+ /*
+ * Usually, the first entry is the real data partition,
+ * the 2nd entry is the next extended partition, or empty,
+ * and the 3rd and 4th entries are unused.
+ * However, DRDOS sometimes has the extended partition as
+ * the first entry (when the data partition is empty),
+ * and OS/2 seems to use all four entries.
+ */
+
+ /*
+ * First process the data partition(s)
+ */
+ for (i=0; i<4; i++, p++) {
+ u32 offs, size, next;
+ if (!NR_SECTS(p) || is_extended_partition(p))
+ continue;
+
+ /* Check the 3rd and 4th entries -
+ these sometimes contain random garbage */
+ offs = START_SECT(p)*sector_size;
+ size = NR_SECTS(p)*sector_size;
+ next = this_sector + offs;
+ if (i >= 2) {
+ if (offs + size > this_size)
+ continue;
+ if (next < first_sector)
+ continue;
+ if (next + size > first_sector + first_size)
+ continue;
+ }
+
+ put_partition(state, state->next, next, size);
+ if (SYS_IND(p) == LINUX_RAID_PARTITION)
+ state->parts[state->next].flags = 1;
+ loopct = 0;
+ if (++state->next == state->limit)
+ goto done;
+ }
+ /*
+ * Next, process the (first) extended partition, if present.
+ * (So far, there seems to be no reason to make
+ * parse_extended() recursive and allow a tree
+ * of extended partitions.)
+ * It should be a link to the next logical partition.
+ */
+ p -= 4;
+ for (i=0; i<4; i++, p++)
+ if (NR_SECTS(p) && is_extended_partition(p))
+ break;
+ if (i == 4)
+ goto done; /* nothing left to do */
+
+ this_sector = first_sector + START_SECT(p) * sector_size;
+ this_size = NR_SECTS(p) * sector_size;
+ put_dev_sector(sect);
+ }
+done:
+ put_dev_sector(sect);
+}
+
+
+int openwrt_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+ int sector_size = bdev_hardsect_size(bdev) / 512;
+ Sector sect;
+ unsigned char *data;
+ struct partition *p;
+ int slot;
+ u32 last_block = 0;
+ u32 size = 0;
+ int firstfree = 5;
+
+ data = read_dev_sector(bdev, 0, &sect);
+ if (!data)
+ return -1;
+ if (!openwrt_magic_present(data)) {
+ printk("No OpenWrt partition table detected\n");
+ put_dev_sector(sect);
+ return 0;
+ }
+
+ /*
+ * Now that the 55aa signature is present, this is probably
+ * either the boot sector of a FAT filesystem or a DOS-type
+ * partition table. Reject this in case the boot indicator
+ * is not 0 or 0x80.
+ */
+ p = (struct partition *) (data + 0x1be);
+ for (slot = 1; slot <= 4; slot++, p++) {
+ if (p->boot_ind != 0 && p->boot_ind != 0x80) {
+ put_dev_sector(sect);
+ return 0;
+ }
+ }
+
+ p = (struct partition *) (data + 0x1be);
+
+ /*
+ * Look for partitions in two passes:
+ * First find the primary and DOS-type extended partitions.
+ */
+
+ state->next = 6;
+ for (slot = 1 ; slot <= 4 ; slot++, p++) {
+ u32 start = START_SECT(p)*sector_size;
+ size = NR_SECTS(p)*sector_size;
+ if (!size) {
+ if (firstfree > slot)
+ firstfree = slot;
+
+ continue;
+ }
+ if (is_extended_partition(p)) {
+ /* prevent someone doing mkfs or mkswap on an
+ extended partition, but leave room for LILO */
+ last_block = start + size;
+ put_partition(state, slot, start, size == 1 ? 1 : 2);
+ printk(" <");
+ parse_extended(state, bdev, start, size);
+ printk(" >");
+ continue;
+ }
+ if ((start + size) > get_capacity(bdev->bd_disk))
+ size = get_capacity(bdev->bd_disk) - start;
+ last_block = start + size;
+ put_partition(state, slot, start, size);
+ }
+ if (last_block + 1024 < (size = get_capacity(bdev->bd_disk)))
+ put_partition(state, firstfree, last_block, size - last_block);
+
+ printk("\n");
+
+ put_dev_sector(sect);
+ return 1;
+}
+
diff -urN linux.old/fs/partitions/openwrt.h linux.dev/fs/partitions/openwrt.h
--- linux.old/fs/partitions/openwrt.h 1970-01-01 01:00:00.000000000 +0100
+++ linux.dev/fs/partitions/openwrt.h 2006-06-15 01:27:17.000000000 +0200
@@ -0,0 +1,6 @@
+/*
+ * fs/partitions/openwrt.h
+ */
+
+int openwrt_partition(struct parsed_partitions *state, struct block_device *bdev);
+