virtio_blk: set the zone write granularitygrafted

virtblk_read_zoned_limits() reads the write granularity that the device
reports in virtio_blk_zoned_characteristics and assigns it to the
physical block size and to io_min, but never to the limit that is named
after it. queue_limits.zone_write_granularity is left at zero, so
blk_validate_zoned_limits() raises it to the logical block size:

	if (lim->zone_write_granularity < lim->logical_block_size)
		lim->zone_write_granularity = lim->logical_block_size;

A device that reports a granularity coarser than its logical block size,
which is what the field exists to express, therefore has it silently
reduced. A 512e host managed disk passed through to a guest reports a
logical block size of 512 and a write granularity of 4096, and the guest
ends up with a zone write granularity of 512.

bio_split_alignment() returns lim->zone_write_granularity if it is non-zero
and bio_split_io_at() may split a bio with as per bio_split_alignment().
This can real to the write getting rejected by the host drive, as the write
is not aligned to the physical block size.

zonefs also takes its block size from bdev_zone_write_granularity(), so it
would incorrectly use 512 on a disk that requires 4096.

sd_zbc_read_zones() sets the limit from the physical block size for the
same reason. NVMe ZNS and null_blk leave it unset, but the fallback
gives the right answer for them, as their write granularity is the
logical block size. virtio carries a separate value that may exceed it.

Set the zone write granularity from the value that the device reports.

Fixes: 95bfec41bd3d ("virtio-blk: add support for zoned block devices")
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://patch.msgid.link/20260918140641.2031075-2-cassel@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

25 files changed, 7187 insertions, 0 deletions

diff --git a/block/partitions/Kconfig b/block/partitions/Kconfig
new file mode 100644
index 000000000..ce17e4145
--- /dev/null
+++ b/block/partitions/Kconfig
@@ -0,0 +1,282 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Partition configuration
+#
+menu "Partition Types"
+
+config PARTITION_ADVANCED
+	bool "Advanced partition selection"
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned under an operating system running on a different
+	  architecture than your Linux system.
+
+	  Note that the answer to this question won't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about foreign partitioning schemes.
+
+	  If unsure, say N.
+
+config ACORN_PARTITION
+	bool "Acorn partition support" if PARTITION_ADVANCED
+	default y if ARCH_ACORN
+	help
+	  Support hard disks partitioned under Acorn operating systems.
+
+config ACORN_PARTITION_CUMANA
+	bool "Cumana partition support" if PARTITION_ADVANCED
+	default y if ARCH_ACORN
+	depends on ACORN_PARTITION
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned using the Cumana interface on Acorn machines.
+
+config ACORN_PARTITION_EESOX
+	bool "EESOX partition support" if PARTITION_ADVANCED
+	default y if ARCH_ACORN
+	depends on ACORN_PARTITION
+
+config ACORN_PARTITION_ICS
+	bool "ICS partition support" if PARTITION_ADVANCED
+	default y if ARCH_ACORN
+	depends on ACORN_PARTITION
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned using the ICS interface on Acorn machines.
+
+config ACORN_PARTITION_ADFS
+	bool "Native filecore partition support" if PARTITION_ADVANCED
+	default y if ARCH_ACORN
+	depends on ACORN_PARTITION
+	help
+	  The Acorn Disc Filing System is the standard file system of the
+	  RiscOS operating system which runs on Acorn's ARM-based Risc PC
+	  systems and the Acorn Archimedes range of machines.  If you say
+	  `Y' here, Linux will support disk partitions created under ADFS.
+
+config ACORN_PARTITION_POWERTEC
+	bool "PowerTec partition support" if PARTITION_ADVANCED
+	default y if ARCH_ACORN
+	depends on ACORN_PARTITION
+	help
+	  Support reading partition tables created on Acorn machines using
+	  the PowerTec SCSI drive.
+
+config ACORN_PARTITION_RISCIX
+	bool "RISCiX partition support" if PARTITION_ADVANCED
+	default y if ARCH_ACORN
+	depends on ACORN_PARTITION
+	help
+	  Once upon a time, there was a native Unix port for the Acorn series
+	  of machines called RISCiX.  If you say 'Y' here, Linux will be able
+	  to read disks partitioned under RISCiX.
+
+config AIX_PARTITION
+	bool "AIX basic partition table support" if PARTITION_ADVANCED
+	help
+	  Say Y here if you would like to be able to read the hard disk
+	  partition table format used by IBM or Motorola PowerPC machines
+	  running AIX.  AIX actually uses a Logical Volume Manager, where
+	  "logical volumes" can be spread across one or multiple disks,
+	  but this driver works only for the simple case of partitions which
+	  are contiguous.
+	  Otherwise, say N.
+
+config OSF_PARTITION
+	bool "Alpha OSF partition support" if PARTITION_ADVANCED
+	default y if ALPHA
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned on an Alpha machine.
+
+config AMIGA_PARTITION
+	bool "Amiga partition table support" if PARTITION_ADVANCED
+	default y if (AMIGA || AFFS_FS=y)
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned under AmigaOS.
+
+config ATARI_PARTITION
+	bool "Atari partition table support" if PARTITION_ADVANCED
+	default y if ATARI
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned under the Atari OS.
+
+config IBM_PARTITION
+	bool "IBM disk label and partition support"
+	depends on PARTITION_ADVANCED && S390
+	help
+	  Say Y here if you would like to be able to read the hard disk
+	  partition table format used by IBM DASD disks operating under CMS.
+	  Otherwise, say N.
+
+config MAC_PARTITION
+	bool "Macintosh partition map support" if PARTITION_ADVANCED
+	default y if (MAC || PPC_PMAC)
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned on a Macintosh.
+
+config MSDOS_PARTITION
+	bool "PC BIOS (MSDOS partition tables) support" if PARTITION_ADVANCED
+	default y
+	help
+	  Say Y here.
+
+config BSD_DISKLABEL
+	bool "BSD disklabel (FreeBSD partition tables) support"
+	depends on PARTITION_ADVANCED && MSDOS_PARTITION
+	help
+	  FreeBSD uses its own hard disk partition scheme on your PC. It
+	  requires only one entry in the primary partition table of your disk
+	  and manages it similarly to DOS extended partitions, putting in its
+	  first sector a new partition table in BSD disklabel format. Saying Y
+	  here allows you to read these disklabels and further mount FreeBSD
+	  partitions from within Linux if you have also said Y to "UFS
+	  file system support", above. If you don't know what all this is
+	  about, say N.
+
+config MINIX_SUBPARTITION
+	bool "Minix subpartition support"
+	depends on PARTITION_ADVANCED && MSDOS_PARTITION
+	help
+	  Minix 2.0.0/2.0.2 subpartition table support for Linux.
+	  Say Y here if you want to mount and use Minix 2.0.0/2.0.2
+	  subpartitions.
+
+config SOLARIS_X86_PARTITION
+	bool "Solaris (x86) partition table support"
+	depends on PARTITION_ADVANCED && MSDOS_PARTITION
+	help
+	  Like most systems, Solaris x86 uses its own hard disk partition
+	  table format, incompatible with all others. Saying Y here allows you
+	  to read these partition tables and further mount Solaris x86
+	  partitions from within Linux if you have also said Y to "UFS
+	  file system support", above.
+
+config UNIXWARE_DISKLABEL
+	bool "Unixware slices support"
+	depends on PARTITION_ADVANCED && MSDOS_PARTITION
+	help
+	  Like some systems, UnixWare uses its own slice table inside a
+	  partition (VTOC - Virtual Table of Contents). Its format is
+	  incompatible with all other OSes. Saying Y here allows you to read
+	  VTOC and further mount UnixWare partitions read-only from within
+	  Linux if you have also said Y to "UFS file system support" or
+	  "System V and Coherent file system support", above.
+
+	  This is mainly used to carry data from a UnixWare box to your
+	  Linux box via a removable medium like magneto-optical, ZIP or
+	  removable IDE drives. Note, however, that a good portable way to
+	  transport files and directories between unixes (and even other
+	  operating systems) is given by the tar program ("man tar" or
+	  preferably "info tar").
+
+	  If you don't know what all this is about, say N.
+
+config LDM_PARTITION
+	bool "Windows Logical Disk Manager (Dynamic Disk) support"
+	depends on PARTITION_ADVANCED
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned using Windows 2000's/XP's or Vista's Logical Disk
+	  Manager.  They are also known as "Dynamic Disks".
+
+	  Note this driver only supports Dynamic Disks with a protective MBR
+	  label, i.e. DOS partition table.  It does not support GPT labelled
+	  Dynamic Disks yet as can be created with Vista.
+
+	  Windows 2000 introduced the concept of Dynamic Disks to get around
+	  the limitations of the PC's partitioning scheme.  The Logical Disk
+	  Manager allows the user to repartition a disk and create spanned,
+	  mirrored, striped or RAID volumes, all without the need for
+	  rebooting.
+
+	  Normal partitions are now called Basic Disks under Windows 2000, XP,
+	  and Vista.
+
+	  For a fuller description read <file:Documentation/admin-guide/ldm.rst>.
+
+	  If unsure, say N.
+
+config LDM_DEBUG
+	bool "Windows LDM extra logging"
+	depends on LDM_PARTITION
+	help
+	  Say Y here if you would like LDM to log verbosely.  This could be
+	  helpful if the driver doesn't work as expected and you'd like to
+	  report a bug.
+
+	  If unsure, say N.
+
+config SGI_PARTITION
+	bool "SGI partition support" if PARTITION_ADVANCED
+	default y if DEFAULT_SGI_PARTITION
+	help
+	  Say Y here if you would like to be able to read the hard disk
+	  partition table format used by SGI machines.
+
+config ULTRIX_PARTITION
+	bool "Ultrix partition table support" if PARTITION_ADVANCED
+	default y if MACH_DECSTATION
+	help
+	  Say Y here if you would like to be able to read the hard disk
+	  partition table format used by DEC (now Compaq) Ultrix machines.
+	  Otherwise, say N.
+
+config SUN_PARTITION
+	bool "Sun partition tables support" if PARTITION_ADVANCED
+	default y if (SPARC || SUN3 || SUN3X)
+	help
+	  Like most systems, SunOS uses its own hard disk partition table
+	  format, incompatible with all others. Saying Y here allows you to
+	  read these partition tables and further mount SunOS partitions from
+	  within Linux if you have also said Y to "UFS file system support",
+	  above. This is mainly used to carry data from a SPARC under SunOS to
+	  your Linux box via a removable medium like magneto-optical or ZIP
+	  drives; note however that a good portable way to transport files and
+	  directories between unixes (and even other operating systems) is
+	  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" if PARTITION_ADVANCED
+	default y
+	select CRC32
+	help
+	  Say Y here if you would like to use hard disks under Linux which
+	  were partitioned using EFI GPT.
+
+config SYSV68_PARTITION
+	bool "SYSV68 partition table support" if PARTITION_ADVANCED
+	default y if VME
+	help
+	  Say Y here if you would like to be able to read the hard disk
+	  partition table format used by Motorola Delta machines (using
+	  sysv68).
+	  Otherwise, say N.
+
+config CMDLINE_PARTITION
+	bool "Command line partition support" if PARTITION_ADVANCED
+	help
+	  Say Y here if you want to read the partition table from bootargs.
+	  The format for the command line is just like mtdparts.
+
+config OF_PARTITION
+	bool "Device Tree partition support" if PARTITION_ADVANCED
+	depends on OF
+	help
+	  Say Y here if you want to enable support for partition table
+	  defined in Device Tree. (mainly for eMMC)
+	  The format for the device tree node is just like MTD fixed-partition
+	  schema.
+
+endmenu
diff --git a/block/partitions/Makefile b/block/partitions/Makefile
new file mode 100644
index 000000000..25d424922
--- /dev/null
+++ b/block/partitions/Makefile
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the linux kernel.
+#
+
+obj-$(CONFIG_BLOCK) += core.o
+obj-$(CONFIG_ACORN_PARTITION) += acorn.o
+obj-$(CONFIG_AMIGA_PARTITION) += amiga.o
+obj-$(CONFIG_ATARI_PARTITION) += atari.o
+obj-$(CONFIG_AIX_PARTITION) += aix.o
+obj-$(CONFIG_CMDLINE_PARTITION) += cmdline.o
+obj-$(CONFIG_MAC_PARTITION) += mac.o
+obj-$(CONFIG_LDM_PARTITION) += ldm.o
+obj-$(CONFIG_MSDOS_PARTITION) += msdos.o
+obj-$(CONFIG_OF_PARTITION) += of.o
+obj-$(CONFIG_OSF_PARTITION) += osf.o
+obj-$(CONFIG_SGI_PARTITION) += sgi.o
+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-$(CONFIG_KARMA_PARTITION) += karma.o
+obj-$(CONFIG_SYSV68_PARTITION) += sysv68.o
diff --git a/block/partitions/acorn.c b/block/partitions/acorn.c
new file mode 100644
index 000000000..067d6a27a
--- /dev/null
+++ b/block/partitions/acorn.c
@@ -0,0 +1,547 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (c) 1996-2000 Russell King.
+ *
+ *  Scan ADFS partitions on hard disk drives.  Unfortunately, there
+ *  isn't a standard for partitioning drives on Acorn machines, so
+ *  every single manufacturer of SCSI and IDE cards created their own
+ *  method.
+ */
+#include <linux/buffer_head.h>
+#include <linux/adfs_fs.h>
+#include <linux/minmax.h>
+
+#include "check.h"
+
+/*
+ * Partition types. (Oh for reusability)
+ */
+#define PARTITION_RISCIX_MFM	1
+#define PARTITION_RISCIX_SCSI	2
+#define PARTITION_LINUX		9
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+	defined(CONFIG_ACORN_PARTITION_ADFS)
+static struct adfs_discrecord *
+adfs_partition(struct parsed_partitions *state, char *name, char *data,
+	       unsigned long first_sector, int slot)
+{
+	struct adfs_discrecord *dr;
+	unsigned int nr_sects;
+
+	if (adfs_checkbblk(data))
+		return NULL;
+
+	dr = (struct adfs_discrecord *)(data + 0x1c0);
+
+	if (dr->disc_size == 0 && dr->disc_size_high == 0)
+		return NULL;
+
+	nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
+		   (le32_to_cpu(dr->disc_size) >> 9);
+
+	if (name) {
+		seq_buf_printf(&state->pp_buf, " [%s]", name);
+	}
+	put_partition(state, slot, first_sector, nr_sects);
+	return dr;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+
+struct riscix_part {
+	__le32	start;
+	__le32	length;
+	__le32	one;
+	char	name[16];
+};
+
+struct riscix_record {
+	__le32	magic;
+#define RISCIX_MAGIC	cpu_to_le32(0x4a657320)
+	__le32	date;
+	struct riscix_part part[8];
+};
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+	defined(CONFIG_ACORN_PARTITION_ADFS)
+static int riscix_partition(struct parsed_partitions *state,
+			    unsigned long first_sect, int slot,
+			    unsigned long nr_sects)
+{
+	Sector sect;
+	struct riscix_record *rr;
+	
+	rr = read_part_sector(state, first_sect, &sect);
+	if (!rr)
+		return -1;
+
+	seq_buf_puts(&state->pp_buf, " [RISCiX]");
+
+
+	if (rr->magic == RISCIX_MAGIC) {
+		unsigned long size = min(nr_sects, 2);
+		int part;
+
+		seq_buf_puts(&state->pp_buf, " <");
+
+		put_partition(state, slot++, first_sect, size);
+		for (part = 0; part < 8; part++) {
+			if (rr->part[part].one &&
+			    memcmp(rr->part[part].name, "All\0", 4)) {
+				put_partition(state, slot++,
+					le32_to_cpu(rr->part[part].start),
+					le32_to_cpu(rr->part[part].length));
+				seq_buf_printf(&state->pp_buf, "(%s)", rr->part[part].name);
+			}
+		}
+
+		seq_buf_puts(&state->pp_buf, " >\n");
+	} else {
+		put_partition(state, slot++, first_sect, nr_sects);
+	}
+
+	put_dev_sector(sect);
+	return slot;
+}
+#endif
+#endif
+
+#define LINUX_NATIVE_MAGIC 0xdeafa1de
+#define LINUX_SWAP_MAGIC   0xdeafab1e
+
+struct linux_part {
+	__le32 magic;
+	__le32 start_sect;
+	__le32 nr_sects;
+};
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+	defined(CONFIG_ACORN_PARTITION_ADFS)
+static int linux_partition(struct parsed_partitions *state,
+			   unsigned long first_sect, int slot,
+			   unsigned long nr_sects)
+{
+	Sector sect;
+	struct linux_part *linuxp;
+	unsigned long size = min(nr_sects, 2);
+
+	seq_buf_puts(&state->pp_buf, " [Linux]");
+
+	put_partition(state, slot++, first_sect, size);
+
+	linuxp = read_part_sector(state, first_sect, &sect);
+	if (!linuxp)
+		return -1;
+
+	seq_buf_puts(&state->pp_buf, " <");
+	while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
+	       linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
+		if (slot == state->limit)
+			break;
+		put_partition(state, slot++, first_sect +
+				 le32_to_cpu(linuxp->start_sect),
+				 le32_to_cpu(linuxp->nr_sects));
+		linuxp ++;
+	}
+	seq_buf_puts(&state->pp_buf, " >");
+
+	put_dev_sector(sect);
+	return slot;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+int adfspart_check_CUMANA(struct parsed_partitions *state)
+{
+	unsigned long first_sector = 0;
+	unsigned int start_blk = 0;
+	Sector sect;
+	unsigned char *data;
+	char *name = "CUMANA/ADFS";
+	int first = 1;
+	int slot = 1;
+
+	/*
+	 * Try Cumana style partitions - sector 6 contains ADFS boot block
+	 * with pointer to next 'drive'.
+	 *
+	 * There are unknowns in this code - is the 'cylinder number' of the
+	 * next partition relative to the start of this one - I'm assuming
+	 * it is.
+	 *
+	 * Also, which ID did Cumana use?
+	 *
+	 * This is totally unfinished, and will require more work to get it
+	 * going. Hence it is totally untested.
+	 */
+	do {
+		struct adfs_discrecord *dr;
+		unsigned int nr_sects;
+
+		data = read_part_sector(state, start_blk * 2 + 6, &sect);
+		if (!data)
+			return -1;
+
+		if (slot == state->limit)
+			break;
+
+		dr = adfs_partition(state, name, data, first_sector, slot++);
+		if (!dr)
+			break;
+
+		name = NULL;
+
+		nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
+			   (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
+			   dr->secspertrack;
+
+		if (!nr_sects)
+			break;
+
+		first = 0;
+		first_sector += nr_sects;
+		start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
+		nr_sects = 0; /* hmm - should be partition size */
+
+		switch (data[0x1fc] & 15) {
+		case 0: /* No partition / ADFS? */
+			break;
+
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+		case PARTITION_RISCIX_SCSI:
+			/* RISCiX - we don't know how to find the next one. */
+			slot = riscix_partition(state, first_sector, slot,
+						nr_sects);
+			break;
+#endif
+
+		case PARTITION_LINUX:
+			slot = linux_partition(state, first_sector, slot,
+					       nr_sects);
+			break;
+		}
+		put_dev_sector(sect);
+		if (slot == -1)
+			return -1;
+	} while (1);
+	put_dev_sector(sect);
+	return first ? 0 : 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_ADFS
+/*
+ * Purpose: allocate ADFS partitions.
+ *
+ * Params : hd		- pointer to gendisk structure to store partition info.
+ *	    dev		- device number to access.
+ *
+ * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
+ *
+ * Alloc  : hda  = whole drive
+ *	    hda1 = ADFS partition on first drive.
+ *	    hda2 = non-ADFS partition.
+ */
+int adfspart_check_ADFS(struct parsed_partitions *state)
+{
+	unsigned long start_sect, nr_sects, sectscyl, heads;
+	Sector sect;
+	unsigned char *data;
+	struct adfs_discrecord *dr;
+	unsigned char id;
+	int slot = 1;
+
+	data = read_part_sector(state, 6, &sect);
+	if (!data)
+		return -1;
+
+	dr = adfs_partition(state, "ADFS", data, 0, slot++);
+	if (!dr) {
+		put_dev_sector(sect);
+    		return 0;
+	}
+
+	heads = dr->heads + ((dr->lowsector >> 6) & 1);
+	sectscyl = dr->secspertrack * heads;
+	start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
+	id = data[0x1fc] & 15;
+	put_dev_sector(sect);
+
+	/*
+	 * Work out start of non-adfs partition.
+	 */
+	nr_sects = get_capacity(state->disk) - start_sect;
+
+	if (start_sect) {
+		switch (id) {
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+		case PARTITION_RISCIX_SCSI:
+		case PARTITION_RISCIX_MFM:
+			riscix_partition(state, start_sect, slot,
+						nr_sects);
+			break;
+#endif
+
+		case PARTITION_LINUX:
+			linux_partition(state, start_sect, slot,
+					       nr_sects);
+			break;
+		}
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+	return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_ICS
+
+struct ics_part {
+	__le32 start;
+	__le32 size;
+};
+
+static int adfspart_check_ICSLinux(struct parsed_partitions *state,
+				   unsigned long block)
+{
+	Sector sect;
+	unsigned char *data = read_part_sector(state, block, &sect);
+	int result = 0;
+
+	if (data) {
+		if (memcmp(data, "LinuxPart", 9) == 0)
+			result = 1;
+		put_dev_sector(sect);
+	}
+
+	return result;
+}
+
+/*
+ * Check for a valid ICS partition using the checksum.
+ */
+static inline int valid_ics_sector(const unsigned char *data)
+{
+	unsigned long sum;
+	int i;
+
+	for (i = 0, sum = 0x50617274; i < 508; i++)
+		sum += data[i];
+
+	sum -= le32_to_cpu(*(__le32 *)(&data[508]));
+
+	return sum == 0;
+}
+
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd		- pointer to gendisk structure to store partition info.
+ *	    dev		- device number to access.
+ * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
+ * Alloc  : hda  = whole drive
+ *	    hda1 = ADFS partition 0 on first drive.
+ *	    hda2 = ADFS partition 1 on first drive.
+ *		..etc..
+ */
+int adfspart_check_ICS(struct parsed_partitions *state)
+{
+	const unsigned char *data;
+	const struct ics_part *p;
+	int slot;
+	Sector sect;
+
+	/*
+	 * Try ICS style partitions - sector 0 contains partition info.
+	 */
+	data = read_part_sector(state, 0, &sect);
+	if (!data)
+	    	return -1;
+
+	if (!valid_ics_sector(data)) {
+	    	put_dev_sector(sect);
+		return 0;
+	}
+
+	seq_buf_puts(&state->pp_buf, " [ICS]");
+
+	for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
+		u32 start = le32_to_cpu(p->start);
+		s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
+
+		if (slot == state->limit)
+			break;
+
+		/*
+		 * Negative sizes tell the RISC OS ICS driver to ignore
+		 * this partition - in effect it says that this does not
+		 * contain an ADFS filesystem.
+		 */
+		if (size < 0) {
+			size = -size;
+
+			/*
+			 * Our own extension - We use the first sector
+			 * of the partition to identify what type this
+			 * partition is.  We must not make this visible
+			 * to the filesystem.
+			 */
+			if (size > 1 && adfspart_check_ICSLinux(state, start)) {
+				start += 1;
+				size -= 1;
+			}
+		}
+
+		if (size)
+			put_partition(state, slot++, start, size);
+	}
+
+	put_dev_sector(sect);
+	seq_buf_puts(&state->pp_buf, "\n");
+	return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+struct ptec_part {
+	__le32 unused1;
+	__le32 unused2;
+	__le32 start;
+	__le32 size;
+	__le32 unused5;
+	char type[8];
+};
+
+static inline int valid_ptec_sector(const unsigned char *data)
+{
+	unsigned char checksum = 0x2a;
+	int i;
+
+	/*
+	 * If it looks like a PC/BIOS partition, then it
+	 * probably isn't PowerTec.
+	 */
+	if (data[510] == 0x55 && data[511] == 0xaa)
+		return 0;
+
+	for (i = 0; i < 511; i++)
+		checksum += data[i];
+
+	return checksum == data[511];
+}
+
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd		- pointer to gendisk structure to store partition info.
+ *	    dev		- device number to access.
+ * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
+ * Alloc  : hda  = whole drive
+ *	    hda1 = ADFS partition 0 on first drive.
+ *	    hda2 = ADFS partition 1 on first drive.
+ *		..etc..
+ */
+int adfspart_check_POWERTEC(struct parsed_partitions *state)
+{
+	Sector sect;
+	const unsigned char *data;
+	const struct ptec_part *p;
+	int slot = 1;
+	int i;
+
+	data = read_part_sector(state, 0, &sect);
+	if (!data)
+		return -1;
+
+	if (!valid_ptec_sector(data)) {
+		put_dev_sector(sect);
+		return 0;
+	}
+
+	seq_buf_puts(&state->pp_buf, " [POWERTEC]");
+
+	for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
+		u32 start = le32_to_cpu(p->start);
+		u32 size = le32_to_cpu(p->size);
+
+		if (size)
+			put_partition(state, slot++, start, size);
+	}
+
+	put_dev_sector(sect);
+	seq_buf_puts(&state->pp_buf, "\n");
+	return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_EESOX
+struct eesox_part {
+	char	magic[6];
+	char	name[10];
+	__le32	start;
+	__le32	unused6;
+	__le32	unused7;
+	__le32	unused8;
+};
+
+/*
+ * Guess who created this format?
+ */
+static const char eesox_name[] = {
+	'N', 'e', 'i', 'l', ' ',
+	'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
+};
+
+/*
+ * EESOX SCSI partition format.
+ *
+ * This is a goddamned awful partition format.  We don't seem to store
+ * the size of the partition in this table, only the start addresses.
+ *
+ * There are two possibilities where the size comes from:
+ *  1. The individual ADFS boot block entries that are placed on the disk.
+ *  2. The start address of the next entry.
+ */
+int adfspart_check_EESOX(struct parsed_partitions *state)
+{
+	Sector sect;
+	const unsigned char *data;
+	unsigned char buffer[256];
+	struct eesox_part *p;
+	sector_t start = 0;
+	int i, slot = 1;
+
+	data = read_part_sector(state, 7, &sect);
+	if (!data)
+		return -1;
+
+	/*
+	 * "Decrypt" the partition table.  God knows why...
+	 */
+	for (i = 0; i < 256; i++)
+		buffer[i] = data[i] ^ eesox_name[i & 15];
+
+	put_dev_sector(sect);
+
+	for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
+		sector_t next;
+
+		if (memcmp(p->magic, "Eesox", 6))
+			break;
+
+		next = le32_to_cpu(p->start);
+		if (i)
+			put_partition(state, slot++, start, next - start);
+		start = next;
+	}
+
+	if (i != 0) {
+		sector_t size;
+
+		size = get_capacity(state->disk);
+		put_partition(state, slot++, start, size - start);
+		seq_buf_puts(&state->pp_buf, "\n");
+	}
+
+	return i ? 1 : 0;
+}
+#endif
diff --git a/block/partitions/aix.c b/block/partitions/aix.c
new file mode 100644
index 000000000..689837deb
--- /dev/null
+++ b/block/partitions/aix.c
@@ -0,0 +1,293 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/aix.c
+ *
+ *  Copyright (C) 2012-2013 Philippe De Muyter <phdm@macqel.be>
+ */
+
+#include "check.h"
+
+struct lvm_rec {
+	char lvm_id[4]; /* "_LVM" */
+	char reserved4[16];
+	__be32 lvmarea_len;
+	__be32 vgda_len;
+	__be32 vgda_psn[2];
+	char reserved36[10];
+	__be16 pp_size; /* log2(pp_size) */
+	char reserved46[12];
+	__be16 version;
+	};
+
+struct vgda {
+	__be32 secs;
+	__be32 usec;
+	char reserved8[16];
+	__be16 numlvs;
+	__be16 maxlvs;
+	__be16 pp_size;
+	__be16 numpvs;
+	__be16 total_vgdas;
+	__be16 vgda_size;
+	};
+
+struct lvd {
+	__be16 lv_ix;
+	__be16 res2;
+	__be16 res4;
+	__be16 maxsize;
+	__be16 lv_state;
+	__be16 mirror;
+	__be16 mirror_policy;
+	__be16 num_lps;
+	__be16 res10[8];
+	};
+
+struct lvname {
+	char name[64];
+	};
+
+struct ppe {
+	__be16 lv_ix;
+	unsigned short res2;
+	unsigned short res4;
+	__be16 lp_ix;
+	unsigned short res8[12];
+	};
+
+struct pvd {
+	char reserved0[16];
+	__be16 pp_count;
+	char reserved18[2];
+	__be32 psn_part1;
+	char reserved24[8];
+	struct ppe ppe[1016];
+	};
+
+#define LVM_MAXLVS 256
+
+/**
+ * read_lba(): Read bytes from disk, starting at given LBA
+ * @state
+ * @lba
+ * @buffer
+ * @count
+ *
+ * Description:  Reads @count bytes from @state->disk into @buffer.
+ * Returns number of bytes read on success, 0 on error.
+ */
+static size_t read_lba(struct parsed_partitions *state, u64 lba, u8 *buffer,
+			size_t count)
+{
+	size_t totalreadcount = 0;
+
+	if (!buffer || lba + count / 512 > get_capacity(state->disk) - 1ULL)
+		return 0;
+
+	while (count) {
+		int copied = 512;
+		Sector sect;
+		unsigned char *data = read_part_sector(state, lba++, &sect);
+		if (!data)
+			break;
+		if (copied > count)
+			copied = count;
+		memcpy(buffer, data, copied);
+		put_dev_sector(sect);
+		buffer += copied;
+		totalreadcount += copied;
+		count -= copied;
+	}
+	return totalreadcount;
+}
+
+/**
+ * alloc_pvd(): reads physical volume descriptor
+ * @state
+ * @lba
+ *
+ * Description: Returns pvd on success,  NULL on error.
+ * Allocates space for pvd and fill it with disk blocks at @lba
+ * Notes: remember to free pvd when you're done!
+ */
+static struct pvd *alloc_pvd(struct parsed_partitions *state, u32 lba)
+{
+	size_t count = sizeof(struct pvd);
+	struct pvd *p;
+
+	p = kmalloc(count, GFP_KERNEL);
+	if (!p)
+		return NULL;
+
+	if (read_lba(state, lba, (u8 *) p, count) < count) {
+		kfree(p);
+		return NULL;
+	}
+	return p;
+}
+
+/**
+ * alloc_lvn(): reads logical volume names
+ * @state
+ * @lba
+ *
+ * Description: Returns lvn on success,  NULL on error.
+ * Allocates space for lvn and fill it with disk blocks at @lba
+ * Notes: remember to free lvn when you're done!
+ */
+static struct lvname *alloc_lvn(struct parsed_partitions *state, u32 lba)
+{
+	size_t count = sizeof(struct lvname) * LVM_MAXLVS;
+	struct lvname *p;
+
+	p = kmalloc(count, GFP_KERNEL);
+	if (!p)
+		return NULL;
+
+	if (read_lba(state, lba, (u8 *) p, count) < count) {
+		kfree(p);
+		return NULL;
+	}
+	return p;
+}
+
+int aix_partition(struct parsed_partitions *state)
+{
+	int ret = 0;
+	Sector sect;
+	unsigned char *d;
+	u32 pp_bytes_size;
+	u32 pp_blocks_size = 0;
+	u32 vgda_sector = 0;
+	u32 vgda_len = 0;
+	int numlvs = 0;
+	struct pvd *pvd = NULL;
+	struct lv_info {
+		unsigned short pps_per_lv;
+		unsigned short pps_found;
+		unsigned char lv_is_contiguous;
+	} *lvip;
+	struct lvname *n = NULL;
+
+	d = read_part_sector(state, 7, &sect);
+	if (d) {
+		struct lvm_rec *p = (struct lvm_rec *)d;
+		u16 lvm_version = be16_to_cpu(p->version);
+
+		if (lvm_version == 1) {
+			int pp_size_log2 = be16_to_cpu(p->pp_size);
+
+			pp_bytes_size = 1 << pp_size_log2;
+			pp_blocks_size = pp_bytes_size / 512;
+			seq_buf_printf(&state->pp_buf,
+				       " AIX LVM header version %u found\n",
+				       lvm_version);
+			vgda_len = be32_to_cpu(p->vgda_len);
+			vgda_sector = be32_to_cpu(p->vgda_psn[0]);
+		} else {
+			seq_buf_printf(&state->pp_buf,
+				       " unsupported AIX LVM version %d found\n",
+				       lvm_version);
+		}
+		put_dev_sector(sect);
+	}
+	if (vgda_sector && (d = read_part_sector(state, vgda_sector, &sect))) {
+		struct vgda *p = (struct vgda *)d;
+
+		numlvs = be16_to_cpu(p->numlvs);
+		put_dev_sector(sect);
+	}
+	lvip = kzalloc_objs(struct lv_info, state->limit);
+	if (!lvip)
+		return 0;
+	if (numlvs && (d = read_part_sector(state, vgda_sector + 1, &sect))) {
+		struct lvd *p = (struct lvd *)d;
+		int i;
+
+		n = alloc_lvn(state, vgda_sector + vgda_len - 33);
+		if (n) {
+			int foundlvs = 0;
+
+			/*
+			 * The lvd array was read as a single sector; only the
+			 * struct lvd entries that fit in it are valid.  Bound the
+			 * scan so an on-disk numlvs larger than that cannot walk
+			 * the read buffer out of bounds.
+			 */
+			for (i = 0; foundlvs < numlvs && i < state->limit &&
+				    i < SECTOR_SIZE / (int)sizeof(struct lvd); i++) {
+				lvip[i].pps_per_lv = be16_to_cpu(p[i].num_lps);
+				if (lvip[i].pps_per_lv)
+					foundlvs += 1;
+			}
+			/* pvd loops depend on n[].name and lvip[].pps_per_lv */
+			pvd = alloc_pvd(state, vgda_sector + 17);
+		}
+		put_dev_sector(sect);
+	}
+	if (pvd) {
+		int numpps = be16_to_cpu(pvd->pp_count);
+		int psn_part1 = be32_to_cpu(pvd->psn_part1);
+		int i;
+		int cur_lv_ix = -1;
+		int next_lp_ix = 1;
+		int lp_ix;
+
+		/*
+		 * pvd was read into a fixed-size struct pvd whose ppe[] array
+		 * holds ARRAY_SIZE(pvd->ppe) entries.  pp_count is an
+		 * unvalidated on-disk __be16, so clamp the scan to the array
+		 * size to avoid walking past the allocation.
+		 */
+		if (numpps > ARRAY_SIZE(pvd->ppe))
+			numpps = ARRAY_SIZE(pvd->ppe);
+
+		for (i = 0; i < numpps; i += 1) {
+			struct ppe *p = pvd->ppe + i;
+			unsigned int lv_ix;
+
+			lp_ix = be16_to_cpu(p->lp_ix);
+			if (!lp_ix) {
+				next_lp_ix = 1;
+				continue;
+			}
+			lv_ix = be16_to_cpu(p->lv_ix) - 1;
+			if (lv_ix >= state->limit) {
+				cur_lv_ix = -1;
+				continue;
+			}
+			lvip[lv_ix].pps_found += 1;
+			if (lp_ix == 1) {
+				cur_lv_ix = lv_ix;
+				next_lp_ix = 1;
+			} else if (lv_ix != cur_lv_ix || lp_ix != next_lp_ix) {
+				next_lp_ix = 1;
+				continue;
+			}
+			if (lp_ix == lvip[lv_ix].pps_per_lv) {
+				put_partition(state, lv_ix + 1,
+				  (i + 1 - lp_ix) * pp_blocks_size + psn_part1,
+				  lvip[lv_ix].pps_per_lv * pp_blocks_size);
+				seq_buf_printf(&state->pp_buf, " <%s>\n",
+					       n[lv_ix].name);
+				lvip[lv_ix].lv_is_contiguous = 1;
+				ret = 1;
+				next_lp_ix = 1;
+			} else
+				next_lp_ix += 1;
+		}
+		for (i = 0; i < state->limit; i += 1)
+			if (lvip[i].pps_found && !lvip[i].lv_is_contiguous) {
+				char tmp[sizeof(n[i].name) + 1]; // null char
+
+				snprintf(tmp, sizeof(tmp), "%s", n[i].name);
+				pr_warn("partition %s (%u pp's found) is "
+					"not contiguous\n",
+					tmp, lvip[i].pps_found);
+			}
+		kfree(pvd);
+	}
+	kfree(n);
+	kfree(lvip);
+	return ret;
+}
diff --git a/block/partitions/amiga.c b/block/partitions/amiga.c
new file mode 100644
index 000000000..8325046a1
--- /dev/null
+++ b/block/partitions/amiga.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/amiga.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#define pr_fmt(fmt) fmt
+
+#include <linux/types.h>
+#include <linux/mm_types.h>
+#include <linux/overflow.h>
+#include <linux/affs_hardblocks.h>
+
+#include "check.h"
+
+/* magic offsets in partition DosEnvVec */
+#define NR_HD	3
+#define NR_SECT	5
+#define LO_CYL	9
+#define HI_CYL	10
+
+static __inline__ u32
+checksum_block(__be32 *m, int size)
+{
+	u32 sum = 0;
+
+	while (size--)
+		sum += be32_to_cpu(*m++);
+	return sum;
+}
+
+int amiga_partition(struct parsed_partitions *state)
+{
+	Sector sect;
+	unsigned char *data;
+	struct RigidDiskBlock *rdb;
+	struct PartitionBlock *pb;
+	u64 start_sect, nr_sects;
+	sector_t blk, end_sect;
+	u32 cylblk;		/* rdb_CylBlocks = nr_heads*sect_per_track */
+	u32 nr_hd, nr_sect, lo_cyl, hi_cyl;
+	int part, res = 0;
+	unsigned int blksize = 1;	/* Multiplier for disk block size */
+	int slot = 1;
+
+	for (blk = 0; ; blk++, put_dev_sector(sect)) {
+		if (blk == RDB_ALLOCATION_LIMIT)
+			goto rdb_done;
+		data = read_part_sector(state, blk, &sect);
+		if (!data) {
+			pr_err("Dev %s: unable to read RDB block %llu\n",
+			       state->disk->disk_name, blk);
+			res = -1;
+			goto rdb_done;
+		}
+		if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
+			continue;
+
+		rdb = (struct RigidDiskBlock *)data;
+		if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
+			break;
+		/* Try again with 0xdc..0xdf zeroed, Windows might have
+		 * trashed it.
+		 */
+		*(__be32 *)(data+0xdc) = 0;
+		if (checksum_block((__be32 *)data,
+				be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
+			pr_err("Trashed word at 0xd0 in block %llu ignored in checksum calculation\n",
+			       blk);
+			break;
+		}
+
+		pr_err("Dev %s: RDB in block %llu has bad checksum\n",
+		       state->disk->disk_name, blk);
+	}
+
+	/* blksize is blocks per 512 byte standard block */
+	blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
+
+	/* Be more informative */
+	seq_buf_printf(&state->pp_buf, " RDSK (%d)", blksize * 512);
+	blk = be32_to_cpu(rdb->rdb_PartitionList);
+	put_dev_sector(sect);
+	for (part = 1; (s32) blk>0 && part<=16; part++, put_dev_sector(sect)) {
+		/* Read in terms partition table understands */
+		if (check_mul_overflow(blk, (sector_t) blksize, &blk)) {
+			pr_err("Dev %s: overflow calculating partition block %llu! Skipping partitions %u and beyond\n",
+				state->disk->disk_name, blk, part);
+			break;
+		}
+		data = read_part_sector(state, blk, &sect);
+		if (!data) {
+			pr_err("Dev %s: unable to read partition block %llu\n",
+			       state->disk->disk_name, blk);
+			res = -1;
+			goto rdb_done;
+		}
+		pb  = (struct PartitionBlock *)data;
+		blk = be32_to_cpu(pb->pb_Next);
+		if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
+			continue;
+		if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
+			continue;
+
+		/* RDB gives us more than enough rope to hang ourselves with,
+		 * many times over (2^128 bytes if all fields max out).
+		 * Some careful checks are in order, so check for potential
+		 * overflows.
+		 * We are multiplying four 32 bit numbers to one sector_t!
+		 */
+
+		nr_hd   = be32_to_cpu(pb->pb_Environment[NR_HD]);
+		nr_sect = be32_to_cpu(pb->pb_Environment[NR_SECT]);
+
+		/* CylBlocks is total number of blocks per cylinder */
+		if (check_mul_overflow(nr_hd, nr_sect, &cylblk)) {
+			pr_err("Dev %s: heads*sects %u overflows u32, skipping partition!\n",
+				state->disk->disk_name, cylblk);
+			continue;
+		}
+
+		/* check for consistency with RDB defined CylBlocks */
+		if (cylblk > be32_to_cpu(rdb->rdb_CylBlocks)) {
+			pr_warn("Dev %s: cylblk %u > rdb_CylBlocks %u!\n",
+				state->disk->disk_name, cylblk,
+				be32_to_cpu(rdb->rdb_CylBlocks));
+		}
+
+		/* RDB allows for variable logical block size -
+		 * normalize to 512 byte blocks and check result.
+		 */
+
+		if (check_mul_overflow(cylblk, blksize, &cylblk)) {
+			pr_err("Dev %s: partition %u bytes per cyl. overflows u32, skipping partition!\n",
+				state->disk->disk_name, part);
+			continue;
+		}
+
+		/* Calculate partition start and end. Limit of 32 bit on cylblk
+		 * guarantees no overflow occurs if LBD support is enabled.
+		 */
+
+		lo_cyl = be32_to_cpu(pb->pb_Environment[LO_CYL]);
+		start_sect = ((u64) lo_cyl * cylblk);
+
+		hi_cyl = be32_to_cpu(pb->pb_Environment[HI_CYL]);
+		nr_sects = (((u64) hi_cyl - lo_cyl + 1) * cylblk);
+
+		if (!nr_sects)
+			continue;
+
+		/* Warn user if partition end overflows u32 (AmigaDOS limit) */
+
+		if ((start_sect + nr_sects) > UINT_MAX) {
+			pr_warn("Dev %s: partition %u (%llu-%llu) needs 64 bit device support!\n",
+				state->disk->disk_name, part,
+				start_sect, start_sect + nr_sects);
+		}
+
+		if (check_add_overflow(start_sect, nr_sects, &end_sect)) {
+			pr_err("Dev %s: partition %u (%llu-%llu) needs LBD device support, skipping partition!\n",
+				state->disk->disk_name, part,
+				start_sect, end_sect);
+			continue;
+		}
+
+		/* Tell Kernel about it */
+
+		put_partition(state,slot++,start_sect,nr_sects);
+		{
+			/* Be even more informative to aid mounting */
+			char dostype[4];
+
+			__be32 *dt = (__be32 *)dostype;
+			*dt = pb->pb_Environment[16];
+			if (dostype[3] < ' ')
+				seq_buf_printf(&state->pp_buf,
+					       " (%c%c%c^%c)",
+					       dostype[0], dostype[1],
+					       dostype[2],
+					       dostype[3] + '@');
+			else
+				seq_buf_printf(&state->pp_buf,
+					       " (%c%c%c%c)",
+					       dostype[0], dostype[1],
+					       dostype[2], dostype[3]);
+			seq_buf_printf(&state->pp_buf, "(res %d spb %d)",
+				       be32_to_cpu(pb->pb_Environment[6]),
+				       be32_to_cpu(pb->pb_Environment[4]));
+		}
+		res = 1;
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+
+rdb_done:
+	return res;
+}
diff --git a/block/partitions/atari.c b/block/partitions/atari.c
new file mode 100644
index 000000000..2438d1448
--- /dev/null
+++ b/block/partitions/atari.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/atari.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 "atari.h"
+
+/* ++guenther: this should be settable by the user ("make config")?.
+ */
+#define ICD_PARTS
+
+/* check if a partition entry looks valid -- Atari format is assumed if at
+   least one of the primary entries is ok this way */
+#define	VALID_PARTITION(pi,hdsiz)					     \
+    (((pi)->flg & 1) &&							     \
+     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
+     be32_to_cpu((pi)->st) <= (hdsiz) &&				     \
+     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
+
+static inline int OK_id(char *s)
+{
+	return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
+		memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
+		memcmp (s, "RAW", 3) == 0 ;
+}
+
+int atari_partition(struct parsed_partitions *state)
+{
+	Sector sect;
+	struct rootsector *rs;
+	struct partition_info *pi;
+	u32 extensect;
+	u32 hd_size;
+	int slot;
+#ifdef ICD_PARTS
+	int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
+#endif
+
+	/*
+	 * ATARI partition scheme supports 512 lba only.  If this is not
+	 * the case, bail early to avoid miscalculating hd_size.
+	 */
+	if (queue_logical_block_size(state->disk->queue) != 512)
+		return 0;
+
+	rs = read_part_sector(state, 0, &sect);
+	if (!rs)
+		return -1;
+
+	/* Verify this is an Atari rootsector: */
+	hd_size = get_capacity(state->disk);
+	if (!VALID_PARTITION(&rs->part[0], hd_size) &&
+	    !VALID_PARTITION(&rs->part[1], hd_size) &&
+	    !VALID_PARTITION(&rs->part[2], hd_size) &&
+	    !VALID_PARTITION(&rs->part[3], hd_size)) {
+		/*
+		 * if there's no valid primary partition, assume that no Atari
+		 * format partition table (there's no reliable magic or the like
+	         * :-()
+		 */
+		put_dev_sector(sect);
+		return 0;
+	}
+
+	pi = &rs->part[0];
+	seq_buf_puts(&state->pp_buf, " AHDI");
+	for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
+		struct rootsector *xrs;
+		Sector sect2;
+		ulong partsect;
+
+		if ( !(pi->flg & 1) )
+			continue;
+		/* active partition */
+		if (memcmp (pi->id, "XGM", 3) != 0) {
+			/* we don't care about other id's */
+			put_partition (state, slot, be32_to_cpu(pi->st),
+					be32_to_cpu(pi->siz));
+			continue;
+		}
+		/* extension partition */
+#ifdef ICD_PARTS
+		part_fmt = 1;
+#endif
+		seq_buf_puts(&state->pp_buf, " XGM<");
+		partsect = extensect = be32_to_cpu(pi->st);
+		while (1) {
+			xrs = read_part_sector(state, partsect, &sect2);
+			if (!xrs) {
+				printk (" block %ld read failed\n", partsect);
+				put_dev_sector(sect);
+				return -1;
+			}
+
+			/* ++roman: sanity check: bit 0 of flg field must be set */
+			if (!(xrs->part[0].flg & 1)) {
+				printk( "\nFirst sub-partition in extended partition is not valid!\n" );
+				put_dev_sector(sect2);
+				break;
+			}
+
+			put_partition(state, slot,
+				   partsect + be32_to_cpu(xrs->part[0].st),
+				   be32_to_cpu(xrs->part[0].siz));
+
+			if (!(xrs->part[1].flg & 1)) {
+				/* end of linked partition list */
+				put_dev_sector(sect2);
+				break;
+			}
+			if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
+				printk("\nID of extended partition is not XGM!\n");
+				put_dev_sector(sect2);
+				break;
+			}
+
+			partsect = be32_to_cpu(xrs->part[1].st) + extensect;
+			put_dev_sector(sect2);
+			if (++slot == state->limit) {
+				printk( "\nMaximum number of partitions reached!\n" );
+				break;
+			}
+		}
+		seq_buf_puts(&state->pp_buf, " >");
+	}
+#ifdef ICD_PARTS
+	if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
+		pi = &rs->icdpart[0];
+		/* sanity check: no ICD format if first partition invalid */
+		if (OK_id(pi->id)) {
+			seq_buf_puts(&state->pp_buf, " ICD<");
+			for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
+				/* accept only GEM,BGM,RAW,LNX,SWP partitions */
+				if (!((pi->flg & 1) && OK_id(pi->id)))
+					continue;
+				put_partition (state, slot,
+						be32_to_cpu(pi->st),
+						be32_to_cpu(pi->siz));
+			}
+			seq_buf_puts(&state->pp_buf, " >");
+		}
+	}
+#endif
+	put_dev_sector(sect);
+
+	seq_buf_puts(&state->pp_buf, "\n");
+
+	return 1;
+}
diff --git a/block/partitions/atari.h b/block/partitions/atari.h
new file mode 100644
index 000000000..678202442
--- /dev/null
+++ b/block/partitions/atari.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  fs/partitions/atari.h
+ *  Moved by Russell King from:
+ *
+ * linux/include/linux/atari_rootsec.h
+ * definitions for Atari Rootsector layout
+ * by Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de)
+ *
+ * modified for ICD/Supra partitioning scheme restricted to at most 12
+ * partitions
+ * by Guenther Kelleter (guenther@pool.informatik.rwth-aachen.de)
+ */
+
+#include <linux/compiler.h>
+
+struct partition_info
+{
+  u8 flg;			/* bit 0: active; bit 7: bootable */
+  char id[3];			/* "GEM", "BGM", "XGM", or other */
+  __be32 st;			/* start of partition */
+  __be32 siz;			/* length of partition */
+};
+
+struct rootsector
+{
+  char unused[0x156];		/* room for boot code */
+  struct partition_info icdpart[8];	/* info for ICD-partitions 5..12 */
+  char unused2[0xc];
+  u32 hd_siz;			/* size of disk in blocks */
+  struct partition_info part[4];
+  u32 bsl_st;			/* start of bad sector list */
+  u32 bsl_cnt;			/* length of bad sector list */
+  u16 checksum;			/* checksum for bootable disks */
+} __packed;
+
diff --git a/block/partitions/check.h b/block/partitions/check.h
new file mode 100644
index 000000000..b0997467b
--- /dev/null
+++ b/block/partitions/check.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/pagemap.h>
+#include <linux/blkdev.h>
+#include <linux/seq_buf.h>
+#include "../blk.h"
+
+/*
+ * add_gd_partition adds a partitions details to the devices partition
+ * description.
+ */
+struct parsed_partitions {
+	struct gendisk *disk;
+	char name[BDEVNAME_SIZE];
+	struct {
+		sector_t from;
+		sector_t size;
+		int flags;
+		bool has_info;
+		struct partition_meta_info info;
+	} *parts;
+	int next;
+	int limit;
+	bool access_beyond_eod;
+	struct seq_buf pp_buf;
+};
+
+typedef struct {
+	struct folio *v;
+} Sector;
+
+void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p);
+static inline void put_dev_sector(Sector p)
+{
+	folio_put(p.v);
+}
+
+static inline void
+put_partition(struct parsed_partitions *p, int n, sector_t from, sector_t size)
+{
+	if (n < p->limit) {
+		p->parts[n].from = from;
+		p->parts[n].size = size;
+		seq_buf_printf(&p->pp_buf, " %s%d", p->name, n);
+	}
+}
+
+/* detection routines go here in alphabetical order: */
+int adfspart_check_ADFS(struct parsed_partitions *state);
+int adfspart_check_CUMANA(struct parsed_partitions *state);
+int adfspart_check_EESOX(struct parsed_partitions *state);
+int adfspart_check_ICS(struct parsed_partitions *state);
+int adfspart_check_POWERTEC(struct parsed_partitions *state);
+int aix_partition(struct parsed_partitions *state);
+int amiga_partition(struct parsed_partitions *state);
+int atari_partition(struct parsed_partitions *state);
+int cmdline_partition(struct parsed_partitions *state);
+int efi_partition(struct parsed_partitions *state);
+int ibm_partition(struct parsed_partitions *);
+int karma_partition(struct parsed_partitions *state);
+int ldm_partition(struct parsed_partitions *state);
+int mac_partition(struct parsed_partitions *state);
+int msdos_partition(struct parsed_partitions *state);
+int of_partition(struct parsed_partitions *state);
+int osf_partition(struct parsed_partitions *state);
+int sgi_partition(struct parsed_partitions *state);
+int sun_partition(struct parsed_partitions *state);
+int sysv68_partition(struct parsed_partitions *state);
+int ultrix_partition(struct parsed_partitions *state);
diff --git a/block/partitions/cmdline.c b/block/partitions/cmdline.c
new file mode 100644
index 000000000..4fd52ed15
--- /dev/null
+++ b/block/partitions/cmdline.c
@@ -0,0 +1,383 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2013 HUAWEI
+ * Author: Cai Zhiyong <caizhiyong@huawei.com>
+ *
+ * Read block device partition table from the command line.
+ * Typically used for fixed block (eMMC) embedded devices.
+ * It has no MBR, so saves storage space. Bootloader can be easily accessed
+ * by absolute address of data on the block device.
+ * Users can easily change the partition.
+ *
+ * The format for the command line is just like mtdparts.
+ *
+ * For further information, see "Documentation/block/cmdline-partition.rst"
+ *
+ */
+#include <linux/blkdev.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include "check.h"
+
+
+/* partition flags */
+#define PF_RDONLY                   0x01 /* Device is read only */
+#define PF_POWERUP_LOCK             0x02 /* Always locked after reset */
+
+struct cmdline_subpart {
+	char name[BDEVNAME_SIZE]; /* partition name, such as 'rootfs' */
+	sector_t from;
+	sector_t size;
+	int flags;
+	struct cmdline_subpart *next_subpart;
+};
+
+struct cmdline_parts {
+	char name[BDEVNAME_SIZE]; /* block device, such as 'mmcblk0' */
+	unsigned int nr_subparts;
+	struct cmdline_subpart *subpart;
+	struct cmdline_parts *next_parts;
+};
+
+static int parse_subpart(struct cmdline_subpart **subpart, char *partdef)
+{
+	int ret = 0;
+	struct cmdline_subpart *new_subpart;
+
+	*subpart = NULL;
+
+	new_subpart = kzalloc_obj(struct cmdline_subpart);
+	if (!new_subpart)
+		return -ENOMEM;
+
+	if (*partdef == '-') {
+		new_subpart->size = (sector_t)(~0ULL);
+		partdef++;
+	} else {
+		new_subpart->size = (sector_t)memparse(partdef, &partdef);
+		if (new_subpart->size < (sector_t)PAGE_SIZE) {
+			pr_warn("cmdline partition size is invalid.");
+			ret = -EINVAL;
+			goto fail;
+		}
+	}
+
+	if (*partdef == '@') {
+		partdef++;
+		new_subpart->from = (sector_t)memparse(partdef, &partdef);
+	} else {
+		new_subpart->from = (sector_t)(~0ULL);
+	}
+
+	if (*partdef == '(') {
+		partdef++;
+		char *next = strsep(&partdef, ")");
+
+		if (!next) {
+			pr_warn("cmdline partition format is invalid.");
+			ret = -EINVAL;
+			goto fail;
+		}
+
+		strscpy(new_subpart->name, next, sizeof(new_subpart->name));
+	} else
+		new_subpart->name[0] = '\0';
+
+	new_subpart->flags = 0;
+
+	if (!strncmp(partdef, "ro", 2)) {
+		new_subpart->flags |= PF_RDONLY;
+		partdef += 2;
+	}
+
+	if (!strncmp(partdef, "lk", 2)) {
+		new_subpart->flags |= PF_POWERUP_LOCK;
+		partdef += 2;
+	}
+
+	*subpart = new_subpart;
+	return 0;
+fail:
+	kfree(new_subpart);
+	return ret;
+}
+
+static void free_subpart(struct cmdline_parts *parts)
+{
+	struct cmdline_subpart *subpart;
+
+	while (parts->subpart) {
+		subpart = parts->subpart;
+		parts->subpart = subpart->next_subpart;
+		kfree(subpart);
+	}
+}
+
+static int parse_parts(struct cmdline_parts **parts, char *bdevdef)
+{
+	int ret = -EINVAL;
+	char *next;
+	struct cmdline_subpart **next_subpart;
+	struct cmdline_parts *newparts;
+
+	*parts = NULL;
+
+	newparts = kzalloc_obj(struct cmdline_parts);
+	if (!newparts)
+		return -ENOMEM;
+
+	next = strsep(&bdevdef, ":");
+	if (!next) {
+		pr_warn("cmdline partition has no block device.");
+		goto fail;
+	}
+
+	strscpy(newparts->name, next, sizeof(newparts->name));
+	newparts->nr_subparts = 0;
+
+	next_subpart = &newparts->subpart;
+
+	while ((next = strsep(&bdevdef, ","))) {
+		ret = parse_subpart(next_subpart, next);
+		if (ret)
+			goto fail;
+
+		newparts->nr_subparts++;
+		next_subpart = &(*next_subpart)->next_subpart;
+	}
+
+	if (!newparts->subpart) {
+		pr_warn("cmdline partition has no valid partition.");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	*parts = newparts;
+
+	return 0;
+fail:
+	free_subpart(newparts);
+	kfree(newparts);
+	return ret;
+}
+
+static void cmdline_parts_free(struct cmdline_parts **parts)
+{
+	struct cmdline_parts *next_parts;
+
+	while (*parts) {
+		next_parts = (*parts)->next_parts;
+		free_subpart(*parts);
+		kfree(*parts);
+		*parts = next_parts;
+	}
+}
+
+static int cmdline_parts_parse(struct cmdline_parts **parts,
+		const char *cmdline)
+{
+	int ret;
+	char *buf;
+	char *pbuf;
+	char *next;
+	struct cmdline_parts **next_parts;
+
+	*parts = NULL;
+
+	pbuf = buf = kstrdup(cmdline, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	next_parts = parts;
+
+	while ((next = strsep(&pbuf, ";"))) {
+		ret = parse_parts(next_parts, next);
+		if (ret)
+			goto fail;
+
+		next_parts = &(*next_parts)->next_parts;
+	}
+
+	if (!*parts) {
+		pr_warn("cmdline partition has no valid partition.");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	ret = 0;
+done:
+	kfree(buf);
+	return ret;
+
+fail:
+	cmdline_parts_free(parts);
+	goto done;
+}
+
+static struct cmdline_parts *cmdline_parts_find(struct cmdline_parts *parts,
+					 const char *bdev)
+{
+	while (parts && strncmp(bdev, parts->name, sizeof(parts->name)))
+		parts = parts->next_parts;
+	return parts;
+}
+
+static char *cmdline;
+static struct cmdline_parts *bdev_parts;
+
+static int add_part(int slot, struct cmdline_subpart *subpart,
+		struct parsed_partitions *state)
+{
+	struct partition_meta_info *info;
+
+	if (slot >= state->limit)
+		return 1;
+
+	put_partition(state, slot, subpart->from >> 9,
+		      subpart->size >> 9);
+
+	if (subpart->flags & PF_RDONLY)
+		state->parts[slot].flags |= ADDPART_FLAG_READONLY;
+
+	info = &state->parts[slot].info;
+
+	strscpy(info->volname, subpart->name, sizeof(info->volname));
+
+	seq_buf_printf(&state->pp_buf, "(%s)", info->volname);
+
+	state->parts[slot].has_info = true;
+
+	return 0;
+}
+
+static int cmdline_parts_set(struct cmdline_parts *parts, sector_t disk_size,
+		struct parsed_partitions *state)
+{
+	sector_t from = 0;
+	struct cmdline_subpart *subpart;
+	int slot = 1;
+
+	for (subpart = parts->subpart; subpart;
+	     subpart = subpart->next_subpart, slot++) {
+		if (subpart->from == (sector_t)(~0ULL))
+			subpart->from = from;
+		else
+			from = subpart->from;
+
+		if (from >= disk_size)
+			break;
+
+		if (subpart->size > (disk_size - from))
+			subpart->size = disk_size - from;
+
+		from += subpart->size;
+
+		if (add_part(slot, subpart, state))
+			break;
+	}
+
+	return slot;
+}
+
+static int __init cmdline_parts_setup(char *s)
+{
+	cmdline = s;
+	return 1;
+}
+__setup("blkdevparts=", cmdline_parts_setup);
+
+static bool has_overlaps(sector_t from, sector_t size,
+			 sector_t from2, sector_t size2)
+{
+	sector_t end = from + size;
+	sector_t end2 = from2 + size2;
+
+	if (from >= from2 && from < end2)
+		return true;
+
+	if (end > from2 && end <= end2)
+		return true;
+
+	if (from2 >= from && from2 < end)
+		return true;
+
+	if (end2 > from && end2 <= end)
+		return true;
+
+	return false;
+}
+
+static inline void overlaps_warns_header(void)
+{
+	pr_warn("Overlapping partitions are used in command line partitions.");
+	pr_warn("Don't use filesystems on overlapping partitions:");
+}
+
+static void cmdline_parts_verifier(int slot, struct parsed_partitions *state)
+{
+	int i;
+	bool header = true;
+
+	for (; slot < state->limit && state->parts[slot].has_info; slot++) {
+		for (i = slot+1; i < state->limit && state->parts[i].has_info;
+		     i++) {
+			if (has_overlaps(state->parts[slot].from,
+					 state->parts[slot].size,
+					 state->parts[i].from,
+					 state->parts[i].size)) {
+				if (header) {
+					header = false;
+					overlaps_warns_header();
+				}
+				pr_warn("%s[%llu,%llu] overlaps with "
+					"%s[%llu,%llu].",
+					state->parts[slot].info.volname,
+					(u64)state->parts[slot].from << 9,
+					(u64)state->parts[slot].size << 9,
+					state->parts[i].info.volname,
+					(u64)state->parts[i].from << 9,
+					(u64)state->parts[i].size << 9);
+			}
+		}
+	}
+}
+
+/*
+ * Purpose: allocate cmdline partitions.
+ * Returns:
+ * -1 if unable to read the partition table
+ *  0 if this isn't our partition table
+ *  1 if successful
+ */
+int cmdline_partition(struct parsed_partitions *state)
+{
+	sector_t disk_size;
+	struct cmdline_parts *parts;
+
+	if (cmdline) {
+		if (bdev_parts)
+			cmdline_parts_free(&bdev_parts);
+
+		if (cmdline_parts_parse(&bdev_parts, cmdline)) {
+			cmdline = NULL;
+			return -1;
+		}
+		cmdline = NULL;
+	}
+
+	if (!bdev_parts)
+		return 0;
+
+	parts = cmdline_parts_find(bdev_parts, state->disk->disk_name);
+	if (!parts)
+		return 0;
+
+	disk_size = get_capacity(state->disk) << 9;
+
+	cmdline_parts_set(parts, disk_size, state);
+	cmdline_parts_verifier(1, state);
+
+	seq_buf_puts(&state->pp_buf, "\n");
+
+	return 1;
+}
diff --git a/block/partitions/core.c b/block/partitions/core.c
new file mode 100644
index 000000000..b5c59b79c
--- /dev/null
+++ b/block/partitions/core.c
@@ -0,0 +1,733 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 1991-1998  Linus Torvalds
+ * Re-organised Feb 1998 Russell King
+ * Copyright (C) 2020 Christoph Hellwig
+ */
+#include <linux/fs.h>
+#include <linux/major.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/ctype.h>
+#include <linux/vmalloc.h>
+#include <linux/raid/detect.h>
+#include "check.h"
+
+static int (*const check_part[])(struct parsed_partitions *) = {
+	/*
+	 * Probe partition formats with tables at disk address 0
+	 * that also have an ADFS boot block at 0xdc0.
+	 */
+#ifdef CONFIG_ACORN_PARTITION_ICS
+	adfspart_check_ICS,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+	adfspart_check_POWERTEC,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_EESOX
+	adfspart_check_EESOX,
+#endif
+
+	/*
+	 * Now move on to formats that only have partition info at
+	 * disk address 0xdc0.  Since these may also have stale
+	 * PC/BIOS partition tables, they need to come before
+	 * the msdos entry.
+	 */
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+	adfspart_check_CUMANA,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_ADFS
+	adfspart_check_ADFS,
+#endif
+
+#ifdef CONFIG_CMDLINE_PARTITION
+	cmdline_partition,
+#endif
+#ifdef CONFIG_OF_PARTITION
+	of_partition,		/* cmdline have priority to OF */
+#endif
+#ifdef CONFIG_EFI_PARTITION
+	efi_partition,		/* this must come before msdos */
+#endif
+#ifdef CONFIG_SGI_PARTITION
+	sgi_partition,
+#endif
+#ifdef CONFIG_LDM_PARTITION
+	ldm_partition,		/* this must come before msdos */
+#endif
+#ifdef CONFIG_MSDOS_PARTITION
+	msdos_partition,
+#endif
+#ifdef CONFIG_OSF_PARTITION
+	osf_partition,
+#endif
+#ifdef CONFIG_SUN_PARTITION
+	sun_partition,
+#endif
+#ifdef CONFIG_AMIGA_PARTITION
+	amiga_partition,
+#endif
+#ifdef CONFIG_ATARI_PARTITION
+	atari_partition,
+#endif
+#ifdef CONFIG_MAC_PARTITION
+	mac_partition,
+#endif
+#ifdef CONFIG_ULTRIX_PARTITION
+	ultrix_partition,
+#endif
+#ifdef CONFIG_IBM_PARTITION
+	ibm_partition,
+#endif
+#ifdef CONFIG_KARMA_PARTITION
+	karma_partition,
+#endif
+#ifdef CONFIG_SYSV68_PARTITION
+	sysv68_partition,
+#endif
+	NULL
+};
+
+static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
+{
+	struct parsed_partitions *state;
+	int nr = DISK_MAX_PARTS;
+
+	state = kzalloc_obj(*state);
+	if (!state)
+		return NULL;
+
+	state->parts = vzalloc(array_size(nr, sizeof(state->parts[0])));
+	if (!state->parts) {
+		kfree(state);
+		return NULL;
+	}
+
+	state->limit = nr;
+
+	return state;
+}
+
+static void free_partitions(struct parsed_partitions *state)
+{
+	vfree(state->parts);
+	kfree(state);
+}
+
+static struct parsed_partitions *check_partition(struct gendisk *hd)
+{
+	struct parsed_partitions *state;
+	int i, res, err;
+
+	state = allocate_partitions(hd);
+	if (!state)
+		return NULL;
+	state->pp_buf.buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!state->pp_buf.buffer) {
+		free_partitions(state);
+		return NULL;
+	}
+	seq_buf_init(&state->pp_buf, state->pp_buf.buffer, PAGE_SIZE);
+
+	state->disk = hd;
+	strscpy(state->name, hd->disk_name);
+	seq_buf_printf(&state->pp_buf, " %s:", state->name);
+	if (isdigit(state->name[strlen(state->name)-1]))
+		sprintf(state->name, "p");
+
+	i = res = err = 0;
+	while (!res && check_part[i]) {
+		memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
+		res = check_part[i++](state);
+		if (res < 0) {
+			/*
+			 * We have hit an I/O error which we don't report now.
+			 * But record it, and let the others do their job.
+			 */
+			err = res;
+			res = 0;
+		}
+
+	}
+	if (res > 0) {
+		printk(KERN_INFO "%s", seq_buf_str(&state->pp_buf));
+
+		kfree(state->pp_buf.buffer);
+		return state;
+	}
+	if (state->access_beyond_eod)
+		err = -ENOSPC;
+	/*
+	 * The partition is unrecognized. So report I/O errors if there were any
+	 */
+	if (err)
+		res = err;
+	if (res) {
+		seq_buf_puts(&state->pp_buf,
+			     " unable to read partition table\n");
+		printk(KERN_INFO "%s", seq_buf_str(&state->pp_buf));
+	}
+
+	kfree(state->pp_buf.buffer);
+	free_partitions(state);
+	return ERR_PTR(res);
+}
+
+static ssize_t part_partition_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%d\n", bdev_partno(dev_to_bdev(dev)));
+}
+
+static ssize_t part_start_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect);
+}
+
+static ssize_t part_ro_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%d\n", bdev_read_only(dev_to_bdev(dev)));
+}
+
+static ssize_t part_alignment_offset_show(struct device *dev,
+					  struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", bdev_alignment_offset(dev_to_bdev(dev)));
+}
+
+static ssize_t part_discard_alignment_show(struct device *dev,
+					   struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", bdev_discard_alignment(dev_to_bdev(dev)));
+}
+
+static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
+static DEVICE_ATTR(start, 0444, part_start_show, NULL);
+static DEVICE_ATTR(size, 0444, part_size_show, NULL);
+static DEVICE_ATTR(ro, 0444, part_ro_show, NULL);
+static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL);
+static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL);
+static DEVICE_ATTR(stat, 0444, part_stat_show, NULL);
+static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL);
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+static struct device_attribute dev_attr_fail =
+	__ATTR(make-it-fail, 0644, part_fail_show, part_fail_store);
+#endif
+
+static struct attribute *part_attrs[] = {
+	&dev_attr_partition.attr,
+	&dev_attr_start.attr,
+	&dev_attr_size.attr,
+	&dev_attr_ro.attr,
+	&dev_attr_alignment_offset.attr,
+	&dev_attr_discard_alignment.attr,
+	&dev_attr_stat.attr,
+	&dev_attr_inflight.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+	&dev_attr_fail.attr,
+#endif
+	NULL
+};
+
+static const struct attribute_group part_attr_group = {
+	.attrs = part_attrs,
+};
+
+static const struct attribute_group *part_attr_groups[] = {
+	&part_attr_group,
+#ifdef CONFIG_BLK_DEV_IO_TRACE
+	&blk_trace_attr_group,
+#endif
+	NULL
+};
+
+static void part_release(struct device *dev)
+{
+	put_disk(dev_to_bdev(dev)->bd_disk);
+	bdev_drop(dev_to_bdev(dev));
+}
+
+static int part_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	const struct block_device *part = dev_to_bdev(dev);
+
+	add_uevent_var(env, "PARTN=%u", bdev_partno(part));
+	if (part->bd_meta_info && part->bd_meta_info->volname[0])
+		add_uevent_var(env, "PARTNAME=%s", part->bd_meta_info->volname);
+	if (part->bd_meta_info && part->bd_meta_info->uuid[0])
+		add_uevent_var(env, "PARTUUID=%s", part->bd_meta_info->uuid);
+	return 0;
+}
+
+const struct device_type part_type = {
+	.name		= "partition",
+	.groups		= part_attr_groups,
+	.release	= part_release,
+	.uevent		= part_uevent,
+};
+
+void drop_partition(struct block_device *part)
+{
+	lockdep_assert_held(&part->bd_disk->open_mutex);
+
+	xa_erase(&part->bd_disk->part_tbl, bdev_partno(part));
+	kobject_put(part->bd_holder_dir);
+
+	device_del(&part->bd_device);
+	put_device(&part->bd_device);
+}
+
+static ssize_t whole_disk_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	return 0;
+}
+static const DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
+
+/*
+ * Must be called either with open_mutex held, before a disk can be opened or
+ * after all disk users are gone.
+ */
+static struct block_device *add_partition(struct gendisk *disk, int partno,
+				sector_t start, sector_t len, int flags,
+				struct partition_meta_info *info)
+{
+	dev_t devt = MKDEV(0, 0);
+	struct device *ddev = disk_to_dev(disk);
+	struct device *pdev;
+	struct block_device *bdev;
+	const char *dname;
+	int err;
+
+	lockdep_assert_held(&disk->open_mutex);
+
+	if (partno >= DISK_MAX_PARTS)
+		return ERR_PTR(-EINVAL);
+
+	/*
+	 * Partitions are not supported on zoned block devices that are used as
+	 * such.
+	 */
+	if (bdev_is_zoned(disk->part0)) {
+		pr_warn("%s: partitions not supported on host managed zoned block device\n",
+			disk->disk_name);
+		return ERR_PTR(-ENXIO);
+	}
+
+	if (xa_load(&disk->part_tbl, partno))
+		return ERR_PTR(-EBUSY);
+
+	/* ensure we always have a reference to the whole disk */
+	get_device(disk_to_dev(disk));
+
+	err = -ENOMEM;
+	bdev = bdev_alloc(disk, partno);
+	if (!bdev)
+		goto out_put_disk;
+
+	bdev->bd_start_sect = start;
+	bdev_set_nr_sectors(bdev, len);
+
+	pdev = &bdev->bd_device;
+	dname = dev_name(ddev);
+	if (isdigit(dname[strlen(dname) - 1]))
+		dev_set_name(pdev, "%sp%d", dname, partno);
+	else
+		dev_set_name(pdev, "%s%d", dname, partno);
+
+	device_initialize(pdev);
+	pdev->class = &block_class;
+	pdev->type = &part_type;
+	pdev->parent = ddev;
+
+	/* in consecutive minor range? */
+	if (bdev_partno(bdev) < disk->minors) {
+		devt = MKDEV(disk->major, disk->first_minor + bdev_partno(bdev));
+	} else {
+		err = blk_alloc_ext_minor();
+		if (err < 0)
+			goto out_put;
+		devt = MKDEV(BLOCK_EXT_MAJOR, err);
+	}
+	pdev->devt = devt;
+
+	if (info) {
+		err = -ENOMEM;
+		bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL);
+		if (!bdev->bd_meta_info)
+			goto out_put;
+	}
+
+	/* delay uevent until 'holders' subdir is created */
+	dev_set_uevent_suppress(pdev, 1);
+	err = device_add(pdev);
+	if (err)
+		goto out_put;
+
+	err = -ENOMEM;
+	bdev->bd_holder_dir = kobject_create_and_add("holders", &pdev->kobj);
+	if (!bdev->bd_holder_dir)
+		goto out_del;
+
+	dev_set_uevent_suppress(pdev, 0);
+	if (flags & ADDPART_FLAG_WHOLEDISK) {
+		err = device_create_file(pdev, &dev_attr_whole_disk);
+		if (err)
+			goto out_del;
+	}
+
+	if (flags & ADDPART_FLAG_READONLY)
+		bdev_set_flag(bdev, BD_READ_ONLY);
+
+	/* everything is up and running, commence */
+	err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
+	if (err)
+		goto out_del;
+	bdev_add(bdev, devt);
+
+	/* suppress uevent if the disk suppresses it */
+	if (!dev_get_uevent_suppress(ddev))
+		kobject_uevent(&pdev->kobj, KOBJ_ADD);
+	return bdev;
+
+out_del:
+	kobject_put(bdev->bd_holder_dir);
+	device_del(pdev);
+out_put:
+	put_device(pdev);
+	return ERR_PTR(err);
+out_put_disk:
+	put_disk(disk);
+	return ERR_PTR(err);
+}
+
+static bool partition_overlaps(struct gendisk *disk, sector_t start,
+		sector_t length, int skip_partno)
+{
+	struct block_device *part;
+	bool overlap = false;
+	unsigned long idx;
+
+	rcu_read_lock();
+	xa_for_each_start(&disk->part_tbl, idx, part, 1) {
+		if (bdev_partno(part) != skip_partno &&
+		    start < part->bd_start_sect + bdev_nr_sectors(part) &&
+		    start + length > part->bd_start_sect) {
+			overlap = true;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	return overlap;
+}
+
+int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
+		sector_t length)
+{
+	struct block_device *part;
+	int ret;
+
+	mutex_lock(&disk->open_mutex);
+	if (!disk_live(disk)) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+	if (disk->flags & GENHD_FL_NO_PART) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (partition_overlaps(disk, start, length, -1)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	part = add_partition(disk, partno, start, length,
+			ADDPART_FLAG_NONE, NULL);
+	ret = PTR_ERR_OR_ZERO(part);
+out:
+	mutex_unlock(&disk->open_mutex);
+	return ret;
+}
+
+int bdev_del_partition(struct gendisk *disk, int partno)
+{
+	struct block_device *part = NULL;
+	int ret = -ENXIO;
+
+	mutex_lock(&disk->open_mutex);
+	part = xa_load(&disk->part_tbl, partno);
+	if (!part)
+		goto out_unlock;
+
+	ret = -EBUSY;
+	if (atomic_read(&part->bd_openers))
+		goto out_unlock;
+
+	/*
+	 * We verified that @part->bd_openers is zero above and so
+	 * @part->bd_holder{_ops} can't be set. And since we hold
+	 * @disk->open_mutex the device can't be claimed by anyone.
+	 *
+	 * So no need to call @part->bd_holder_ops->mark_dead() here.
+	 * Just delete the partition and invalidate it.
+	 */
+
+	bdev_unhash(part);
+	invalidate_bdev(part);
+	drop_partition(part);
+	ret = 0;
+out_unlock:
+	mutex_unlock(&disk->open_mutex);
+	return ret;
+}
+
+int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
+		sector_t length)
+{
+	struct block_device *part = NULL;
+	int ret = -ENXIO;
+
+	mutex_lock(&disk->open_mutex);
+	part = xa_load(&disk->part_tbl, partno);
+	if (!part)
+		goto out_unlock;
+
+	ret = -EINVAL;
+	if (start != part->bd_start_sect)
+		goto out_unlock;
+
+	ret = -EBUSY;
+	if (partition_overlaps(disk, start, length, partno))
+		goto out_unlock;
+
+	bdev_set_nr_sectors(part, length);
+
+	ret = 0;
+out_unlock:
+	mutex_unlock(&disk->open_mutex);
+	return ret;
+}
+
+static bool disk_unlock_native_capacity(struct gendisk *disk)
+{
+	if (!disk->fops->unlock_native_capacity ||
+	    test_and_set_bit(GD_NATIVE_CAPACITY, &disk->state)) {
+		printk(KERN_CONT "truncated\n");
+		return false;
+	}
+
+	printk(KERN_CONT "enabling native capacity\n");
+	disk->fops->unlock_native_capacity(disk);
+	return true;
+}
+
+static bool blk_add_partition(struct gendisk *disk,
+		struct parsed_partitions *state, int p)
+{
+	sector_t size = state->parts[p].size;
+	sector_t from = state->parts[p].from;
+	struct block_device *part;
+
+	if (!size)
+		return true;
+
+	if (from >= get_capacity(disk)) {
+		printk(KERN_WARNING
+		       "%s: p%d start %llu is beyond EOD, ",
+		       disk->disk_name, p, (unsigned long long) from);
+		if (disk_unlock_native_capacity(disk))
+			return false;
+		return true;
+	}
+
+	if (from + size > get_capacity(disk)) {
+		printk(KERN_WARNING
+		       "%s: p%d size %llu extends beyond EOD, ",
+		       disk->disk_name, p, (unsigned long long) size);
+
+		if (disk_unlock_native_capacity(disk))
+			return false;
+
+		/*
+		 * We can not ignore partitions of broken tables created by for
+		 * example camera firmware, but we limit them to the end of the
+		 * disk to avoid creating invalid block devices.
+		 */
+		size = get_capacity(disk) - from;
+	}
+
+	part = add_partition(disk, p, from, size, state->parts[p].flags,
+			     &state->parts[p].info);
+	if (IS_ERR(part)) {
+		if (PTR_ERR(part) != -ENXIO) {
+			printk(KERN_ERR " %s: p%d could not be added: %pe\n",
+			       disk->disk_name, p, part);
+		}
+		return true;
+	}
+
+	if (IS_BUILTIN(CONFIG_BLK_DEV_MD) &&
+	    (state->parts[p].flags & ADDPART_FLAG_RAID))
+		md_autodetect_dev(part->bd_dev);
+
+	return true;
+}
+
+static int blk_add_partitions(struct gendisk *disk)
+{
+	struct parsed_partitions *state;
+	int ret = -EAGAIN, p;
+
+	if (!disk_has_partscan(disk))
+		return 0;
+
+	state = check_partition(disk);
+	if (!state)
+		return 0;
+	if (IS_ERR(state)) {
+		/*
+		 * I/O error reading the partition table.  If we tried to read
+		 * beyond EOD, retry after unlocking the native capacity.
+		 */
+		if (PTR_ERR(state) == -ENOSPC) {
+			printk(KERN_WARNING "%s: partition table beyond EOD, ",
+			       disk->disk_name);
+			if (disk_unlock_native_capacity(disk))
+				return -EAGAIN;
+		}
+		return -EIO;
+	}
+
+	/*
+	 * Partitions are not supported on host managed zoned block devices.
+	 */
+	if (bdev_is_zoned(disk->part0)) {
+		pr_warn("%s: ignoring partition table on host managed zoned block device\n",
+			disk->disk_name);
+		ret = 0;
+		goto out_free_state;
+	}
+
+	/*
+	 * If we read beyond EOD, try unlocking native capacity even if the
+	 * partition table was successfully read as we could be missing some
+	 * partitions.
+	 */
+	if (state->access_beyond_eod) {
+		printk(KERN_WARNING
+		       "%s: partition table partially beyond EOD, ",
+		       disk->disk_name);
+		if (disk_unlock_native_capacity(disk))
+			goto out_free_state;
+	}
+
+	/* tell userspace that the media / partition table may have changed */
+	kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+
+	for (p = 1; p < state->limit; p++)
+		if (!blk_add_partition(disk, state, p))
+			goto out_free_state;
+
+	ret = 0;
+out_free_state:
+	free_partitions(state);
+	return ret;
+}
+
+int bdev_disk_changed(struct gendisk *disk, bool invalidate)
+{
+	struct block_device *part;
+	unsigned long idx;
+	int ret = 0;
+
+	lockdep_assert_held(&disk->open_mutex);
+
+	if (!disk_live(disk))
+		return -ENXIO;
+
+rescan:
+	if (disk->open_partitions)
+		return -EBUSY;
+	sync_blockdev(disk->part0);
+	invalidate_bdev(disk->part0);
+
+	xa_for_each_start(&disk->part_tbl, idx, part, 1) {
+		/*
+		 * Remove the block device from the inode hash, so that
+		 * it cannot be looked up any more even when openers
+		 * still hold references.
+		 */
+		bdev_unhash(part);
+
+		/*
+		 * If @disk->open_partitions isn't elevated but there's
+		 * still an active holder of that block device things
+		 * are broken.
+		 */
+		WARN_ON_ONCE(atomic_read(&part->bd_openers));
+		invalidate_bdev(part);
+		drop_partition(part);
+	}
+	clear_bit(GD_NEED_PART_SCAN, &disk->state);
+
+	/*
+	 * Historically we only set the capacity to zero for devices that
+	 * support partitions (independ of actually having partitions created).
+	 * Doing that is rather inconsistent, but changing it broke legacy
+	 * udisks polling for legacy ide-cdrom devices.  Use the crude check
+	 * below to get the sane behavior for most device while not breaking
+	 * userspace for this particular setup.
+	 */
+	if (invalidate) {
+		if (!(disk->flags & GENHD_FL_NO_PART) ||
+		    !(disk->flags & GENHD_FL_REMOVABLE))
+			set_capacity(disk, 0);
+	}
+
+	if (get_capacity(disk)) {
+		ret = blk_add_partitions(disk);
+		if (ret == -EAGAIN)
+			goto rescan;
+	} else if (invalidate) {
+		/*
+		 * Tell userspace that the media / partition table may have
+		 * changed.
+		 */
+		kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+	}
+
+	return ret;
+}
+/*
+ * Only exported for loop and dasd for historic reasons.  Don't use in new
+ * code!
+ */
+EXPORT_SYMBOL_GPL(bdev_disk_changed);
+
+void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
+{
+	struct address_space *mapping = state->disk->part0->bd_mapping;
+	struct folio *folio;
+
+	if (n >= get_capacity(state->disk)) {
+		state->access_beyond_eod = true;
+		goto out;
+	}
+
+	folio = read_mapping_folio(mapping, n >> PAGE_SECTORS_SHIFT, NULL);
+	if (IS_ERR(folio))
+		goto out;
+
+	p->v = folio;
+	return folio_address(folio) + offset_in_folio(folio, n * SECTOR_SIZE);
+out:
+	p->v = NULL;
+	return NULL;
+}
diff --git a/block/partitions/efi.c b/block/partitions/efi.c
new file mode 100644
index 000000000..9865d5909
--- /dev/null
+++ b/block/partitions/efi.c
@@ -0,0 +1,756 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/************************************************************
+ * EFI GUID Partition Table handling
+ *
+ * http://www.uefi.org/specs/
+ * http://www.intel.com/technology/efi/
+ *
+ * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
+ *   Copyright 2000,2001,2002,2004 Dell Inc.
+ *
+ * TODO:
+ *
+ * Changelog:
+ * Mon August 5th, 2013 Davidlohr Bueso <davidlohr@hp.com>
+ * - detect hybrid MBRs, tighter pMBR checking & cleanups.
+ *
+ * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
+ * - test for valid PMBR and valid PGPT before ever reading
+ *   AGPT, allow override with 'gpt' kernel command line option.
+ * - check for first/last_usable_lba outside of size of disk
+ *
+ * Tue  Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Ported to 2.5.7-pre1 and 2.5.7-dj2
+ * - Applied patch to avoid fault in alternate header handling
+ * - cleaned up find_valid_gpt
+ * - On-disk structure and copy in memory is *always* LE now - 
+ *   swab fields as needed
+ * - remove print_gpt_header()
+ * - only use first max_p partition entries, to keep the kernel minor number
+ *   and partition numbers tied.
+ *
+ * Mon  Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Removed __PRIPTR_PREFIX - not being used
+ *
+ * Mon  Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
+ *
+ * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Added compare_gpts().
+ * - moved le_efi_guid_to_cpus() back into this file.  GPT is the only
+ *   thing that keeps EFI GUIDs on disk.
+ * - Changed gpt structure names and members to be simpler and more Linux-like.
+ * 
+ * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
+ *
+ * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Changed function comments to DocBook style per Andreas Dilger suggestion.
+ *
+ * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Change read_lba() to use the page cache per Al Viro's work.
+ * - print u64s properly on all architectures
+ * - fixed debug_printk(), now Dprintk()
+ *
+ * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Style cleanups
+ * - made most functions static
+ * - Endianness addition
+ * - remove test for second alternate header, as it's not per spec,
+ *   and is unnecessary.  There's now a method to read/write the last
+ *   sector of an odd-sized disk from user space.  No tools have ever
+ *   been released which used this code, so it's effectively dead.
+ * - Per Asit Mallick of Intel, added a test for a valid PMBR.
+ * - Added kernel command line option 'gpt' to override valid PMBR test.
+ *
+ * Wed Jun  6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
+ * - added devfs volume UUID support (/dev/volumes/uuids) for
+ *   mounting file systems by the partition GUID. 
+ *
+ * Tue Dec  5 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Moved crc32() to linux/lib, added efi_crc32().
+ *
+ * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Replaced Intel's CRC32 function with an equivalent
+ *   non-license-restricted version.
+ *
+ * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Fixed the last_lba() call to return the proper last block
+ *
+ * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Thanks to Andries Brouwer for his debugging assistance.
+ * - Code works, detects all the partitions.
+ *
+ ************************************************************/
+#include <linux/kernel.h>
+#include <linux/crc32.h>
+#include <linux/ctype.h>
+#include <linux/math64.h>
+#include <linux/slab.h>
+#include "check.h"
+#include "efi.h"
+
+/* This allows a kernel command line option 'gpt' to override
+ * the test for invalid PMBR.  Not __initdata because reloading
+ * the partition tables happens after init too.
+ */
+static int force_gpt;
+static int __init
+force_gpt_fn(char *str)
+{
+	force_gpt = 1;
+	return 1;
+}
+__setup("gpt", force_gpt_fn);
+
+
+/**
+ * efi_crc32() - EFI version of crc32 function
+ * @buf: buffer to calculate crc32 of
+ * @len: length of buf
+ *
+ * Description: Returns EFI-style CRC32 value for @buf
+ * 
+ * This function uses the little endian Ethernet polynomial
+ * but seeds the function with ~0, and xor's with ~0 at the end.
+ * Note, the EFI Specification, v1.02, has a reference to
+ * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
+ */
+static inline u32
+efi_crc32(const void *buf, unsigned long len)
+{
+	return (crc32(~0L, buf, len) ^ ~0L);
+}
+
+/**
+ * last_lba(): return number of last logical block of device
+ * @disk: block device
+ * 
+ * Description: Returns last LBA value on success, 0 on error.
+ * This is stored (by sd and ide-geometry) in
+ *  the part[0] entry for this disk, and is the number of
+ *  physical sectors available on the disk.
+ */
+static u64 last_lba(struct gendisk *disk)
+{
+	return div_u64(bdev_nr_bytes(disk->part0),
+		       queue_logical_block_size(disk->queue)) - 1ULL;
+}
+
+static inline int pmbr_part_valid(gpt_mbr_record *part)
+{
+	if (part->os_type != EFI_PMBR_OSTYPE_EFI_GPT)
+		goto invalid;
+
+	/* set to 0x00000001 (i.e., the LBA of the GPT Partition Header) */
+	if (le32_to_cpu(part->starting_lba) != GPT_PRIMARY_PARTITION_TABLE_LBA)
+		goto invalid;
+
+	return GPT_MBR_PROTECTIVE;
+invalid:
+	return 0;
+}
+
+/**
+ * is_pmbr_valid(): test Protective MBR for validity
+ * @mbr: pointer to a legacy mbr structure
+ * @total_sectors: amount of sectors in the device
+ *
+ * Description: Checks for a valid protective or hybrid
+ * master boot record (MBR). The validity of a pMBR depends
+ * on all of the following properties:
+ *  1) MSDOS signature is in the last two bytes of the MBR
+ *  2) One partition of type 0xEE is found
+ *
+ * In addition, a hybrid MBR will have up to three additional
+ * primary partitions, which point to the same space that's
+ * marked out by up to three GPT partitions.
+ *
+ * Returns 0 upon invalid MBR, or GPT_MBR_PROTECTIVE or
+ * GPT_MBR_HYBRID depending on the device layout.
+ */
+static int is_pmbr_valid(legacy_mbr *mbr, sector_t total_sectors)
+{
+	uint32_t sz = 0;
+	int i, part = 0, ret = 0; /* invalid by default */
+
+	if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
+		goto done;
+
+	for (i = 0; i < 4; i++) {
+		ret = pmbr_part_valid(&mbr->partition_record[i]);
+		if (ret == GPT_MBR_PROTECTIVE) {
+			part = i;
+			/*
+			 * Ok, we at least know that there's a protective MBR,
+			 * now check if there are other partition types for
+			 * hybrid MBR.
+			 */
+			goto check_hybrid;
+		}
+	}
+
+	if (ret != GPT_MBR_PROTECTIVE)
+		goto done;
+check_hybrid:
+	for (i = 0; i < 4; i++)
+		if ((mbr->partition_record[i].os_type !=
+			EFI_PMBR_OSTYPE_EFI_GPT) &&
+		    (mbr->partition_record[i].os_type != 0x00))
+			ret = GPT_MBR_HYBRID;
+
+	/*
+	 * Protective MBRs take up the lesser of the whole disk
+	 * or 2 TiB (32bit LBA), ignoring the rest of the disk.
+	 * Some partitioning programs, nonetheless, choose to set
+	 * the size to the maximum 32-bit limitation, disregarding
+	 * the disk size.
+	 *
+	 * Hybrid MBRs do not necessarily comply with this.
+	 *
+	 * Consider a bad value here to be a warning to support dd'ing
+	 * an image from a smaller disk to a larger disk.
+	 */
+	if (ret == GPT_MBR_PROTECTIVE) {
+		sz = le32_to_cpu(mbr->partition_record[part].size_in_lba);
+		if (sz != (uint32_t) total_sectors - 1 && sz != 0xFFFFFFFF)
+			pr_debug("GPT: mbr size in lba (%u) different than whole disk (%u).\n",
+				 sz, (uint32_t)min(total_sectors - 1, 0xFFFFFFFF));
+	}
+done:
+	return ret;
+}
+
+/**
+ * read_lba(): Read bytes from disk, starting at given LBA
+ * @state: disk parsed partitions
+ * @lba: the Logical Block Address of the partition table
+ * @buffer: destination buffer
+ * @count: bytes to read
+ *
+ * Description: Reads @count bytes from @state->disk into @buffer.
+ * Returns number of bytes read on success, 0 on error.
+ */
+static size_t read_lba(struct parsed_partitions *state,
+		       u64 lba, u8 *buffer, size_t count)
+{
+	size_t totalreadcount = 0;
+	sector_t n = lba *
+		(queue_logical_block_size(state->disk->queue) / 512);
+
+	if (!buffer || lba > last_lba(state->disk))
+                return 0;
+
+	while (count) {
+		int copied = 512;
+		Sector sect;
+		unsigned char *data = read_part_sector(state, n++, &sect);
+		if (!data)
+			break;
+		if (copied > count)
+			copied = count;
+		memcpy(buffer, data, copied);
+		put_dev_sector(sect);
+		buffer += copied;
+		totalreadcount +=copied;
+		count -= copied;
+	}
+	return totalreadcount;
+}
+
+/**
+ * alloc_read_gpt_entries(): reads partition entries from disk
+ * @state: disk parsed partitions
+ * @gpt: GPT header
+ * 
+ * Description: Returns ptes on success,  NULL on error.
+ * Allocates space for PTEs based on information found in @gpt.
+ * Notes: remember to free pte when you're done!
+ */
+static gpt_entry *alloc_read_gpt_entries(struct parsed_partitions *state,
+					 gpt_header *gpt)
+{
+	size_t count;
+	gpt_entry *pte;
+
+	if (!gpt)
+		return NULL;
+
+	count = (size_t)le32_to_cpu(gpt->num_partition_entries) *
+                le32_to_cpu(gpt->sizeof_partition_entry);
+	if (!count)
+		return NULL;
+	pte = kmalloc(count, GFP_KERNEL);
+	if (!pte)
+		return NULL;
+
+	if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba),
+			(u8 *) pte, count) < count) {
+		kfree(pte);
+                pte=NULL;
+		return NULL;
+	}
+	return pte;
+}
+
+/**
+ * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
+ * @state: disk parsed partitions
+ * @lba: the Logical Block Address of the partition table
+ * 
+ * Description: returns GPT header on success, NULL on error.   Allocates
+ * and fills a GPT header starting at @ from @state->disk.
+ * Note: remember to free gpt when finished with it.
+ */
+static gpt_header *alloc_read_gpt_header(struct parsed_partitions *state,
+					 u64 lba)
+{
+	gpt_header *gpt;
+	unsigned ssz = queue_logical_block_size(state->disk->queue);
+
+	gpt = kmalloc(ssz, GFP_KERNEL);
+	if (!gpt)
+		return NULL;
+
+	if (read_lba(state, lba, (u8 *) gpt, ssz) < ssz) {
+		kfree(gpt);
+                gpt=NULL;
+		return NULL;
+	}
+
+	return gpt;
+}
+
+/**
+ * is_gpt_valid() - tests one GPT header and PTEs for validity
+ * @state: disk parsed partitions
+ * @lba: logical block address of the GPT header to test
+ * @gpt: GPT header ptr, filled on return.
+ * @ptes: PTEs ptr, filled on return.
+ *
+ * Description: returns 1 if valid,  0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ */
+static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
+			gpt_header **gpt, gpt_entry **ptes)
+{
+	u32 crc, origcrc;
+	u64 lastlba, pt_size;
+
+	if (!ptes)
+		return 0;
+	if (!(*gpt = alloc_read_gpt_header(state, lba)))
+		return 0;
+
+	/* Check the GUID Partition Table signature */
+	if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
+		pr_debug("GUID Partition Table Header signature is wrong:"
+			 "%lld != %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->signature),
+			 (unsigned long long)GPT_HEADER_SIGNATURE);
+		goto fail;
+	}
+
+	/* Check the GUID Partition Table header size is too big */
+	if (le32_to_cpu((*gpt)->header_size) >
+			queue_logical_block_size(state->disk->queue)) {
+		pr_debug("GUID Partition Table Header size is too large: %u > %u\n",
+			le32_to_cpu((*gpt)->header_size),
+			queue_logical_block_size(state->disk->queue));
+		goto fail;
+	}
+
+	/* Check the GUID Partition Table header size is too small */
+	if (le32_to_cpu((*gpt)->header_size) < sizeof(gpt_header)) {
+		pr_debug("GUID Partition Table Header size is too small: %u < %zu\n",
+			le32_to_cpu((*gpt)->header_size),
+			sizeof(gpt_header));
+		goto fail;
+	}
+
+	/* Check the GUID Partition Table CRC */
+	origcrc = le32_to_cpu((*gpt)->header_crc32);
+	(*gpt)->header_crc32 = 0;
+	crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
+
+	if (crc != origcrc) {
+		pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n",
+			 crc, origcrc);
+		goto fail;
+	}
+	(*gpt)->header_crc32 = cpu_to_le32(origcrc);
+
+	/* Check that the my_lba entry points to the LBA that contains
+	 * the GUID Partition Table */
+	if (le64_to_cpu((*gpt)->my_lba) != lba) {
+		pr_debug("GPT my_lba incorrect: %lld != %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->my_lba),
+			 (unsigned long long)lba);
+		goto fail;
+	}
+
+	/* Check the first_usable_lba and last_usable_lba are
+	 * within the disk.
+	 */
+	lastlba = last_lba(state->disk);
+	if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
+		pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
+			 (unsigned long long)lastlba);
+		goto fail;
+	}
+	if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
+		pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
+			 (unsigned long long)lastlba);
+		goto fail;
+	}
+	if (le64_to_cpu((*gpt)->last_usable_lba) < le64_to_cpu((*gpt)->first_usable_lba)) {
+		pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
+			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba));
+		goto fail;
+	}
+	/* Check that sizeof_partition_entry has the correct value */
+	if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {
+		pr_debug("GUID Partition Entry Size check failed.\n");
+		goto fail;
+	}
+
+	/* Sanity check partition table size */
+	pt_size = (u64)le32_to_cpu((*gpt)->num_partition_entries) *
+		le32_to_cpu((*gpt)->sizeof_partition_entry);
+	if (pt_size > KMALLOC_MAX_SIZE) {
+		pr_debug("GUID Partition Table is too large: %llu > %lu bytes\n",
+			 (unsigned long long)pt_size, KMALLOC_MAX_SIZE);
+		goto fail;
+	}
+
+	if (!(*ptes = alloc_read_gpt_entries(state, *gpt)))
+		goto fail;
+
+	/* Check the GUID Partition Entry Array CRC */
+	crc = efi_crc32((const unsigned char *) (*ptes), pt_size);
+
+	if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
+		pr_debug("GUID Partition Entry Array CRC check failed.\n");
+		goto fail_ptes;
+	}
+
+	/* We're done, all's well */
+	return 1;
+
+ fail_ptes:
+	kfree(*ptes);
+	*ptes = NULL;
+ fail:
+	kfree(*gpt);
+	*gpt = NULL;
+	return 0;
+}
+
+/**
+ * is_pte_valid() - tests one PTE for validity
+ * @pte:pte to check
+ * @lastlba: last lba of the disk
+ *
+ * Description: returns 1 if valid,  0 on error.
+ */
+static inline int
+is_pte_valid(const gpt_entry *pte, const u64 lastlba)
+{
+	if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
+	    le64_to_cpu(pte->starting_lba) > lastlba         ||
+	    le64_to_cpu(pte->ending_lba)   > lastlba)
+		return 0;
+	return 1;
+}
+
+/**
+ * compare_gpts() - Search disk for valid GPT headers and PTEs
+ * @pgpt: primary GPT header
+ * @agpt: alternate GPT header
+ * @lastlba: last LBA number
+ *
+ * Description: Returns nothing.  Sanity checks pgpt and agpt fields
+ * and prints warnings on discrepancies.
+ * 
+ */
+static void
+compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
+{
+	int error_found = 0;
+	if (!pgpt || !agpt)
+		return;
+	if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
+		pr_warn("GPT:Primary header LBA != Alt. header alternate_lba\n");
+		pr_warn("GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->my_lba),
+                       (unsigned long long)le64_to_cpu(agpt->alternate_lba));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
+		pr_warn("GPT:Primary header alternate_lba != Alt. header my_lba\n");
+		pr_warn("GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+                       (unsigned long long)le64_to_cpu(agpt->my_lba));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->first_usable_lba) !=
+            le64_to_cpu(agpt->first_usable_lba)) {
+		pr_warn("GPT:first_usable_lbas don't match.\n");
+		pr_warn("GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
+                       (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->last_usable_lba) !=
+            le64_to_cpu(agpt->last_usable_lba)) {
+		pr_warn("GPT:last_usable_lbas don't match.\n");
+		pr_warn("GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
+                       (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
+		error_found++;
+	}
+	if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
+		pr_warn("GPT:disk_guids don't match.\n");
+		error_found++;
+	}
+	if (le32_to_cpu(pgpt->num_partition_entries) !=
+            le32_to_cpu(agpt->num_partition_entries)) {
+		pr_warn("GPT:num_partition_entries don't match: "
+		       "0x%x != 0x%x\n",
+		       le32_to_cpu(pgpt->num_partition_entries),
+		       le32_to_cpu(agpt->num_partition_entries));
+		error_found++;
+	}
+	if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
+            le32_to_cpu(agpt->sizeof_partition_entry)) {
+		pr_warn("GPT:sizeof_partition_entry values don't match: "
+		       "0x%x != 0x%x\n",
+                       le32_to_cpu(pgpt->sizeof_partition_entry),
+		       le32_to_cpu(agpt->sizeof_partition_entry));
+		error_found++;
+	}
+	if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
+            le32_to_cpu(agpt->partition_entry_array_crc32)) {
+		pr_warn("GPT:partition_entry_array_crc32 values don't match: "
+		       "0x%x != 0x%x\n",
+                       le32_to_cpu(pgpt->partition_entry_array_crc32),
+		       le32_to_cpu(agpt->partition_entry_array_crc32));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
+		pr_warn("GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
+		pr_warn("GPT:%lld != %lld\n",
+			(unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+			(unsigned long long)lastlba);
+		error_found++;
+	}
+
+	if (le64_to_cpu(agpt->my_lba) != lastlba) {
+		pr_warn("GPT:Alternate GPT header not at the end of the disk.\n");
+		pr_warn("GPT:%lld != %lld\n",
+			(unsigned long long)le64_to_cpu(agpt->my_lba),
+			(unsigned long long)lastlba);
+		error_found++;
+	}
+
+	if (error_found)
+		pr_warn("GPT: Use GNU Parted to correct GPT errors.\n");
+	return;
+}
+
+/**
+ * find_valid_gpt() - Search disk for valid GPT headers and PTEs
+ * @state: disk parsed partitions
+ * @gpt: GPT header ptr, filled on return.
+ * @ptes: PTEs ptr, filled on return.
+ *
+ * Description: Returns 1 if valid, 0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ * Validity depends on PMBR being valid (or being overridden by the
+ * 'gpt' kernel command line option) and finding either the Primary
+ * GPT header and PTEs valid, or the Alternate GPT header and PTEs
+ * valid.  If the Primary GPT header is not valid, the Alternate GPT header
+ * is not checked unless the 'gpt' kernel command line option is passed.
+ * This protects against devices which misreport their size, and forces
+ * the user to decide to use the Alternate GPT.
+ */
+static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
+			  gpt_entry **ptes)
+{
+	int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
+	gpt_header *pgpt = NULL, *agpt = NULL;
+	gpt_entry *pptes = NULL, *aptes = NULL;
+	legacy_mbr *legacymbr;
+	struct gendisk *disk = state->disk;
+	const struct block_device_operations *fops = disk->fops;
+	sector_t total_sectors = get_capacity(state->disk);
+	u64 lastlba;
+
+	if (!ptes)
+		return 0;
+
+	lastlba = last_lba(state->disk);
+        if (!force_gpt) {
+		/* This will be added to the EFI Spec. per Intel after v1.02. */
+		legacymbr = kzalloc_obj(*legacymbr);
+		if (!legacymbr)
+			goto fail;
+
+		read_lba(state, 0, (u8 *)legacymbr, sizeof(*legacymbr));
+		good_pmbr = is_pmbr_valid(legacymbr, total_sectors);
+		kfree(legacymbr);
+
+		if (!good_pmbr)
+			goto fail;
+
+		pr_debug("Device has a %s MBR\n",
+			 good_pmbr == GPT_MBR_PROTECTIVE ?
+						"protective" : "hybrid");
+	}
+
+	good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA,
+				 &pgpt, &pptes);
+        if (good_pgpt)
+		good_agpt = is_gpt_valid(state,
+					 le64_to_cpu(pgpt->alternate_lba),
+					 &agpt, &aptes);
+        if (!good_agpt && force_gpt)
+                good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes);
+
+	if (!good_agpt && force_gpt && fops->alternative_gpt_sector) {
+		sector_t agpt_sector;
+		int err;
+
+		err = fops->alternative_gpt_sector(disk, &agpt_sector);
+		if (!err)
+			good_agpt = is_gpt_valid(state, agpt_sector,
+						 &agpt, &aptes);
+	}
+
+        /* The obviously unsuccessful case */
+        if (!good_pgpt && !good_agpt)
+                goto fail;
+
+        compare_gpts(pgpt, agpt, lastlba);
+
+        /* The good cases */
+        if (good_pgpt) {
+                *gpt  = pgpt;
+                *ptes = pptes;
+                kfree(agpt);
+                kfree(aptes);
+		if (!good_agpt)
+                        pr_warn("Alternate GPT is invalid, using primary GPT.\n");
+                return 1;
+        }
+        else if (good_agpt) {
+                *gpt  = agpt;
+                *ptes = aptes;
+                kfree(pgpt);
+                kfree(pptes);
+		pr_warn("Primary GPT is invalid, using alternate GPT.\n");
+                return 1;
+        }
+
+ fail:
+        kfree(pgpt);
+        kfree(agpt);
+        kfree(pptes);
+        kfree(aptes);
+        *gpt = NULL;
+        *ptes = NULL;
+        return 0;
+}
+
+/**
+ * utf16_le_to_7bit(): Naively converts a UTF-16LE string to 7-bit ASCII characters
+ * @in: input UTF-16LE string
+ * @size: size of the input string
+ * @out: output string ptr, should be capable to store @size+1 characters
+ *
+ * Description: Converts @size UTF16-LE symbols from @in string to 7-bit
+ * ASCII characters and stores them to @out. Adds trailing zero to @out array.
+ */
+static void utf16_le_to_7bit(const __le16 *in, unsigned int size, u8 *out)
+{
+	unsigned int i = 0;
+
+	out[size] = 0;
+
+	while (i < size) {
+		u8 c = le16_to_cpu(in[i]) & 0x7f;
+
+		if (c && !isprint(c))
+			c = '!';
+		out[i] = c;
+		i++;
+	}
+}
+
+/**
+ * efi_partition - scan for GPT partitions
+ * @state: disk parsed partitions
+ *
+ * Description: called from check.c, if the disk contains GPT
+ * partitions, sets up partition entries in the kernel.
+ *
+ * If the first block on the disk is a legacy MBR,
+ * it will get handled by msdos_partition().
+ * If it's a Protective MBR, we'll handle it here.
+ *
+ * We do not create a Linux partition for GPT, but
+ * only for the actual data partitions.
+ * Returns:
+ * -1 if unable to read the partition table
+ *  0 if this isn't our partition table
+ *  1 if successful
+ *
+ */
+int efi_partition(struct parsed_partitions *state)
+{
+	gpt_header *gpt = NULL;
+	gpt_entry *ptes = NULL;
+	u32 i;
+	unsigned ssz = queue_logical_block_size(state->disk->queue) / 512;
+
+	if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {
+		kfree(gpt);
+		kfree(ptes);
+		return 0;
+	}
+
+	pr_debug("GUID Partition Table is valid!  Yea!\n");
+
+	for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
+		struct partition_meta_info *info;
+		unsigned label_max;
+		u64 start = le64_to_cpu(ptes[i].starting_lba);
+		u64 size = le64_to_cpu(ptes[i].ending_lba) -
+			   le64_to_cpu(ptes[i].starting_lba) + 1ULL;
+
+		if (!is_pte_valid(&ptes[i], last_lba(state->disk)))
+			continue;
+
+		put_partition(state, i+1, start * ssz, size * ssz);
+
+		/* If this is a RAID volume, tell md */
+		if (!efi_guidcmp(ptes[i].partition_type_guid, PARTITION_LINUX_RAID_GUID))
+			state->parts[i + 1].flags = ADDPART_FLAG_RAID;
+
+		info = &state->parts[i + 1].info;
+		efi_guid_to_str(&ptes[i].unique_partition_guid, info->uuid);
+
+		/* Naively convert UTF16-LE to 7 bits. */
+		label_max = min(ARRAY_SIZE(info->volname) - 1,
+				ARRAY_SIZE(ptes[i].partition_name));
+		utf16_le_to_7bit(ptes[i].partition_name, label_max, info->volname);
+		state->parts[i + 1].has_info = true;
+	}
+	kfree(ptes);
+	kfree(gpt);
+	seq_buf_puts(&state->pp_buf, "\n");
+	return 1;
+}
diff --git a/block/partitions/efi.h b/block/partitions/efi.h
new file mode 100644
index 000000000..84b9f36b9
--- /dev/null
+++ b/block/partitions/efi.h
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/************************************************************
+ * EFI GUID Partition Table
+ * Per Intel EFI Specification v1.02
+ * http://developer.intel.com/technology/efi/efi.htm
+ *
+ * By Matt Domsch <Matt_Domsch@dell.com>  Fri Sep 22 22:15:56 CDT 2000  
+ *   Copyright 2000,2001 Dell Inc.
+ ************************************************************/
+
+#ifndef FS_PART_EFI_H_INCLUDED
+#define FS_PART_EFI_H_INCLUDED
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/efi.h>
+#include <linux/compiler.h>
+
+#define MSDOS_MBR_SIGNATURE 0xaa55
+#define EFI_PMBR_OSTYPE_EFI 0xEF
+#define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
+
+#define GPT_MBR_PROTECTIVE  1
+#define GPT_MBR_HYBRID      2
+
+#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
+#define GPT_HEADER_REVISION_V1 0x00010000
+#define GPT_PRIMARY_PARTITION_TABLE_LBA 1
+
+#define PARTITION_SYSTEM_GUID \
+    EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
+              0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B) 
+#define LEGACY_MBR_PARTITION_GUID \
+    EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
+              0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
+#define PARTITION_MSFT_RESERVED_GUID \
+    EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
+              0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
+#define PARTITION_BASIC_DATA_GUID \
+    EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
+              0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
+#define PARTITION_LINUX_RAID_GUID \
+    EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
+              0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
+#define PARTITION_LINUX_SWAP_GUID \
+    EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
+              0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
+#define PARTITION_LINUX_LVM_GUID \
+    EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
+              0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
+
+typedef struct _gpt_header {
+	__le64 signature;
+	__le32 revision;
+	__le32 header_size;
+	__le32 header_crc32;
+	__le32 reserved1;
+	__le64 my_lba;
+	__le64 alternate_lba;
+	__le64 first_usable_lba;
+	__le64 last_usable_lba;
+	efi_guid_t disk_guid;
+	__le64 partition_entry_lba;
+	__le32 num_partition_entries;
+	__le32 sizeof_partition_entry;
+	__le32 partition_entry_array_crc32;
+
+	/* The rest of the logical block is reserved by UEFI and must be zero.
+	 * EFI standard handles this by:
+	 *
+	 * uint8_t		reserved2[ BlockSize - 92 ];
+	 */
+} __packed gpt_header;
+
+typedef struct _gpt_entry_attributes {
+	u64 required_to_function:1;
+	u64 reserved:47;
+        u64 type_guid_specific:16;
+} __packed gpt_entry_attributes;
+
+typedef struct _gpt_entry {
+	efi_guid_t partition_type_guid;
+	efi_guid_t unique_partition_guid;
+	__le64 starting_lba;
+	__le64 ending_lba;
+	gpt_entry_attributes attributes;
+	__le16 partition_name[72/sizeof(__le16)];
+} __packed gpt_entry;
+
+typedef struct _gpt_mbr_record {
+	u8	boot_indicator; /* unused by EFI, set to 0x80 for bootable */
+	u8	start_head;     /* unused by EFI, pt start in CHS */
+	u8	start_sector;   /* unused by EFI, pt start in CHS */
+	u8	start_track;
+	u8	os_type;        /* EFI and legacy non-EFI OS types */
+	u8	end_head;       /* unused by EFI, pt end in CHS */
+	u8	end_sector;     /* unused by EFI, pt end in CHS */
+	u8	end_track;      /* unused by EFI, pt end in CHS */
+	__le32	starting_lba;   /* used by EFI - start addr of the on disk pt */
+	__le32	size_in_lba;    /* used by EFI - size of pt in LBA */
+} __packed gpt_mbr_record;
+
+
+typedef struct _legacy_mbr {
+	u8 boot_code[440];
+	__le32 unique_mbr_signature;
+	__le16 unknown;
+	gpt_mbr_record partition_record[4];
+	__le16 signature;
+} __packed legacy_mbr;
+
+#endif
diff --git a/block/partitions/ibm.c b/block/partitions/ibm.c
new file mode 100644
index 000000000..54047e722
--- /dev/null
+++ b/block/partitions/ibm.c
@@ -0,0 +1,407 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ *                  Volker Sameske <sameske@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * Copyright IBM Corp. 1999, 2012
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/hdreg.h>
+#include <linux/slab.h>
+#include <asm/dasd.h>
+#include <asm/ebcdic.h>
+#include <linux/uaccess.h>
+#include <asm/vtoc.h>
+#include <linux/module.h>
+#include <linux/dasd_mod.h>
+
+#include "check.h"
+
+union label_t {
+	struct vtoc_volume_label_cdl vol;
+	struct vtoc_volume_label_ldl lnx;
+	struct vtoc_cms_label cms;
+};
+
+/*
+ * compute the block number from a
+ * cyl-cyl-head-head structure
+ */
+static sector_t cchh2blk(struct vtoc_cchh *ptr, struct hd_geometry *geo)
+{
+	sector_t cyl;
+	__u16 head;
+
+	/* decode cylinder and heads for large volumes */
+	cyl = ptr->hh & 0xFFF0;
+	cyl <<= 12;
+	cyl |= ptr->cc;
+	head = ptr->hh & 0x000F;
+	return cyl * geo->heads * geo->sectors +
+	       head * geo->sectors;
+}
+
+/*
+ * compute the block number from a
+ * cyl-cyl-head-head-block structure
+ */
+static sector_t cchhb2blk(struct vtoc_cchhb *ptr, struct hd_geometry *geo)
+{
+	sector_t cyl;
+	__u16 head;
+
+	/* decode cylinder and heads for large volumes */
+	cyl = ptr->hh & 0xFFF0;
+	cyl <<= 12;
+	cyl |= ptr->cc;
+	head = ptr->hh & 0x000F;
+	return	cyl * geo->heads * geo->sectors +
+		head * geo->sectors +
+		ptr->b;
+}
+
+/* Volume Label Type/ID Length */
+#define DASD_VOL_TYPE_LEN	4
+#define DASD_VOL_ID_LEN		6
+
+/* Volume Label Types */
+#define DASD_VOLLBL_TYPE_VOL1 0
+#define DASD_VOLLBL_TYPE_LNX1 1
+#define DASD_VOLLBL_TYPE_CMS1 2
+
+struct dasd_vollabel {
+	char *type;
+	int idx;
+};
+
+static struct dasd_vollabel dasd_vollabels[] = {
+	[DASD_VOLLBL_TYPE_VOL1] = {
+		.type = "VOL1",
+		.idx = DASD_VOLLBL_TYPE_VOL1,
+	},
+	[DASD_VOLLBL_TYPE_LNX1] = {
+		.type = "LNX1",
+		.idx = DASD_VOLLBL_TYPE_LNX1,
+	},
+	[DASD_VOLLBL_TYPE_CMS1] = {
+		.type = "CMS1",
+		.idx = DASD_VOLLBL_TYPE_CMS1,
+	},
+};
+
+static int get_label_by_type(const char *type)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dasd_vollabels); i++) {
+		if (!memcmp(type, dasd_vollabels[i].type, DASD_VOL_TYPE_LEN))
+			return dasd_vollabels[i].idx;
+	}
+
+	return -1;
+}
+
+static int find_label(struct parsed_partitions *state,
+		      dasd_information2_t *info,
+		      struct hd_geometry *geo,
+		      int blocksize,
+		      sector_t *labelsect,
+		      char name[],
+		      char type[],
+		      union label_t *label)
+{
+	sector_t testsect[3];
+	int i, testcount;
+	Sector sect;
+	void *data;
+
+	/* There a three places where we may find a valid label:
+	 * - on an ECKD disk it's block 2
+	 * - on an FBA disk it's block 1
+	 * - on an CMS formatted FBA disk it is sector 1, even if the block size
+	 *   is larger than 512 bytes (possible if the DIAG discipline is used)
+	 * If we have a valid info structure, then we know exactly which case we
+	 * have, otherwise we just search through all possebilities.
+	 */
+	if (info) {
+		if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) ||
+		    (info->cu_type == 0x3880 && info->dev_type == 0x3370))
+			testsect[0] = info->label_block;
+		else
+			testsect[0] = info->label_block * (blocksize >> 9);
+		testcount = 1;
+	} else {
+		testsect[0] = 1;
+		testsect[1] = (blocksize >> 9);
+		testsect[2] = 2 * (blocksize >> 9);
+		testcount = 3;
+	}
+	for (i = 0; i < testcount; ++i) {
+		data = read_part_sector(state, testsect[i], &sect);
+		if (data == NULL)
+			continue;
+		memcpy(label, data, sizeof(*label));
+		memcpy(type, data, DASD_VOL_TYPE_LEN);
+		EBCASC(type, DASD_VOL_TYPE_LEN);
+		put_dev_sector(sect);
+		switch (get_label_by_type(type)) {
+		case DASD_VOLLBL_TYPE_VOL1:
+			memcpy(name, label->vol.volid, DASD_VOL_ID_LEN);
+			EBCASC(name, DASD_VOL_ID_LEN);
+			*labelsect = testsect[i];
+			return 1;
+		case DASD_VOLLBL_TYPE_LNX1:
+		case DASD_VOLLBL_TYPE_CMS1:
+			memcpy(name, label->lnx.volid, DASD_VOL_ID_LEN);
+			EBCASC(name, DASD_VOL_ID_LEN);
+			*labelsect = testsect[i];
+			return 1;
+		default:
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int find_vol1_partitions(struct parsed_partitions *state,
+				struct hd_geometry *geo,
+				int blocksize,
+				char name[],
+				union label_t *label)
+{
+	sector_t blk;
+	int counter;
+	Sector sect;
+	unsigned char *data;
+	loff_t offset, size;
+	struct vtoc_format1_label f1;
+	int secperblk;
+
+	seq_buf_printf(&state->pp_buf, "VOL1/%8s:", name);
+	/*
+	 * get start of VTOC from the disk label and then search for format1
+	 * and format8 labels
+	 */
+	secperblk = blocksize >> 9;
+	blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
+	counter = 0;
+	data = read_part_sector(state, blk * secperblk, &sect);
+	while (data != NULL) {
+		memcpy(&f1, data, sizeof(struct vtoc_format1_label));
+		put_dev_sector(sect);
+		/* skip FMT4 / FMT5 / FMT7 labels */
+		if (f1.DS1FMTID == _ascebc['4']
+		    || f1.DS1FMTID == _ascebc['5']
+		    || f1.DS1FMTID == _ascebc['7']
+		    || f1.DS1FMTID == _ascebc['9']) {
+			blk++;
+			data = read_part_sector(state, blk * secperblk, &sect);
+			continue;
+		}
+		/* only FMT1 and 8 labels valid at this point */
+		if (f1.DS1FMTID != _ascebc['1'] &&
+		    f1.DS1FMTID != _ascebc['8'])
+			break;
+		/* OK, we got valid partition data */
+		offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
+		size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
+			offset + geo->sectors;
+		offset *= secperblk;
+		size *= secperblk;
+		if (counter >= state->limit)
+			break;
+		put_partition(state, counter + 1, offset, size);
+		counter++;
+		blk++;
+		data = read_part_sector(state, blk * secperblk, &sect);
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+
+	if (!data)
+		return -1;
+
+	return 1;
+}
+
+static int find_lnx1_partitions(struct parsed_partitions *state,
+				struct hd_geometry *geo,
+				int blocksize,
+				char name[],
+				union label_t *label,
+				sector_t labelsect,
+				sector_t nr_sectors,
+				dasd_information2_t *info)
+{
+	loff_t offset, geo_size, size;
+	int secperblk;
+
+	seq_buf_printf(&state->pp_buf, "LNX1/%8s:", name);
+	secperblk = blocksize >> 9;
+	if (label->lnx.ldl_version == 0xf2) {
+		size = label->lnx.formatted_blocks * secperblk;
+	} else {
+		/*
+		 * Formated w/o large volume support. If the sanity check
+		 * 'size based on geo == size based on nr_sectors' is true, then
+		 * we can safely assume that we know the formatted size of
+		 * the disk, otherwise we need additional information
+		 * that we can only get from a real DASD device.
+		 */
+		geo_size = geo->cylinders * geo->heads
+			* geo->sectors * secperblk;
+		size = nr_sectors;
+		if (size != geo_size) {
+			if (!info) {
+				seq_buf_puts(&state->pp_buf, "\n");
+				return 1;
+			}
+			if (!strcmp(info->type, "ECKD"))
+				if (geo_size < size)
+					size = geo_size;
+			/* else keep size based on nr_sectors */
+		}
+	}
+	/* first and only partition starts in the first block after the label */
+	offset = labelsect + secperblk;
+	put_partition(state, 1, offset, size - offset);
+	seq_buf_puts(&state->pp_buf, "\n");
+	return 1;
+}
+
+static int find_cms1_partitions(struct parsed_partitions *state,
+				struct hd_geometry *geo,
+				int blocksize,
+				char name[],
+				union label_t *label,
+				sector_t labelsect)
+{
+	loff_t offset, size;
+	int secperblk;
+
+	/*
+	 * VM style CMS1 labeled disk
+	 */
+	blocksize = label->cms.block_size;
+	secperblk = blocksize >> 9;
+	if (label->cms.disk_offset != 0) {
+		seq_buf_printf(&state->pp_buf, "CMS1/%8s(MDSK):", name);
+		/* disk is reserved minidisk */
+		offset = label->cms.disk_offset * secperblk;
+		size = (label->cms.block_count - 1) * secperblk;
+	} else {
+		seq_buf_printf(&state->pp_buf, "CMS1/%8s:", name);
+		/*
+		 * Special case for FBA devices:
+		 * If an FBA device is CMS formatted with blocksize > 512 byte
+		 * and the DIAG discipline is used, then the CMS label is found
+		 * in sector 1 instead of block 1. However, the partition is
+		 * still supposed to start in block 2.
+		 */
+		if (labelsect == 1)
+			offset = 2 * secperblk;
+		else
+			offset = labelsect + secperblk;
+		size = label->cms.block_count * secperblk;
+	}
+
+	put_partition(state, 1, offset, size-offset);
+	seq_buf_puts(&state->pp_buf, "\n");
+	return 1;
+}
+
+
+/*
+ * This is the main function, called by check.c
+ */
+int ibm_partition(struct parsed_partitions *state)
+{
+	int (*fn)(struct gendisk *disk, dasd_information2_t *info);
+	struct gendisk *disk = state->disk;
+	struct block_device *bdev = disk->part0;
+	int blocksize, res;
+	loff_t offset, size;
+	sector_t nr_sectors;
+	dasd_information2_t *info;
+	struct hd_geometry *geo;
+	char type[DASD_VOL_TYPE_LEN + 1] = "";
+	char name[DASD_VOL_ID_LEN + 1] = "";
+	sector_t labelsect;
+	union label_t *label;
+
+	res = 0;
+	if (!disk->fops->getgeo)
+		goto out_exit;
+	fn = symbol_get(dasd_biodasdinfo);
+	blocksize = bdev_logical_block_size(bdev);
+	if (blocksize <= 0)
+		goto out_symbol;
+	nr_sectors = bdev_nr_sectors(bdev);
+	if (nr_sectors == 0)
+		goto out_symbol;
+	info = kmalloc_obj(dasd_information2_t);
+	if (info == NULL)
+		goto out_symbol;
+	geo = kmalloc_obj(struct hd_geometry);
+	if (geo == NULL)
+		goto out_nogeo;
+	label = kmalloc_obj(union label_t);
+	if (label == NULL)
+		goto out_nolab;
+	/* set start if not filled by getgeo function e.g. virtblk */
+	geo->start = get_start_sect(bdev);
+	if (disk->fops->getgeo(disk, geo))
+		goto out_freeall;
+	if (!fn || fn(disk, info)) {
+		kfree(info);
+		info = NULL;
+	}
+
+	if (find_label(state, info, geo, blocksize, &labelsect, name, type, label)) {
+		switch (get_label_by_type(type)) {
+		case DASD_VOLLBL_TYPE_VOL1:
+			res = find_vol1_partitions(state, geo, blocksize, name,
+						   label);
+			break;
+		case DASD_VOLLBL_TYPE_LNX1:
+			res = find_lnx1_partitions(state, geo, blocksize, name,
+						   label, labelsect, nr_sectors,
+						   info);
+			break;
+		case DASD_VOLLBL_TYPE_CMS1:
+			res = find_cms1_partitions(state, geo, blocksize, name,
+						   label, labelsect);
+			break;
+		}
+	} else if (info) {
+		/*
+		 * ugly but needed for backward compatibility:
+		 * If the block device is a DASD (i.e. BIODASDINFO2 works),
+		 * then we claim it in any case, even though it has no valid
+		 * label. If it has the LDL format, then we simply define a
+		 * partition as if it had an LNX1 label.
+		 */
+		res = 1;
+		if (info->format == DASD_FORMAT_LDL) {
+			seq_buf_puts(&state->pp_buf, "(nonl)");
+			size = nr_sectors;
+			offset = (info->label_block + 1) * (blocksize >> 9);
+			put_partition(state, 1, offset, size-offset);
+			seq_buf_puts(&state->pp_buf, "\n");
+		}
+	} else
+		res = 0;
+
+out_freeall:
+	kfree(label);
+out_nolab:
+	kfree(geo);
+out_nogeo:
+	kfree(info);
+out_symbol:
+	if (fn)
+		symbol_put(dasd_biodasdinfo);
+out_exit:
+	return res;
+}
diff --git a/block/partitions/karma.c b/block/partitions/karma.c
new file mode 100644
index 000000000..a4e3c5050
--- /dev/null
+++ b/block/partitions/karma.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/karma.c
+ *  Rio Karma partition info.
+ *
+ *  Copyright (C) 2006 Bob Copeland (me@bobcopeland.com)
+ *  based on osf.c
+ */
+
+#include "check.h"
+#include <linux/compiler.h>
+
+#define KARMA_LABEL_MAGIC		0xAB56
+
+int karma_partition(struct parsed_partitions *state)
+{
+	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;
+	} __packed *label;
+	struct d_partition *p;
+
+	data = read_part_sector(state, 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++;
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+	put_dev_sector(sect);
+	return 1;
+}
+
diff --git a/block/partitions/ldm.c b/block/partitions/ldm.c
new file mode 100644
index 000000000..c0bdcae58
--- /dev/null
+++ b/block/partitions/ldm.c
@@ -0,0 +1,1487 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
+ *
+ * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
+ * Copyright (c) 2001-2012 Anton Altaparmakov
+ * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
+ *
+ * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads 
+ */
+
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/stringify.h>
+#include <linux/kernel.h>
+#include <linux/uuid.h>
+#include <linux/msdos_partition.h>
+
+#include "ldm.h"
+#include "check.h"
+
+/*
+ * ldm_debug/info/error/crit - Output an error message
+ * @f:    A printf format string containing the message
+ * @...:  Variables to substitute into @f
+ *
+ * ldm_debug() writes a DEBUG level message to the syslog but only if the
+ * driver was compiled with debug enabled. Otherwise, the call turns into a NOP.
+ */
+#ifndef CONFIG_LDM_DEBUG
+#define ldm_debug(...)	do {} while (0)
+#else
+#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __func__, f, ##a)
+#endif
+
+#define ldm_crit(f, a...)  _ldm_printk (KERN_CRIT,  __func__, f, ##a)
+#define ldm_error(f, a...) _ldm_printk (KERN_ERR,   __func__, f, ##a)
+#define ldm_info(f, a...)  _ldm_printk (KERN_INFO,  __func__, f, ##a)
+
+static __printf(3, 4)
+void _ldm_printk(const char *level, const char *function, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start (args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	printk("%s%s(): %pV\n", level, function, &vaf);
+
+	va_end(args);
+}
+
+/**
+ * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure
+ * @data:  Raw database PRIVHEAD structure loaded from the device
+ * @ph:    In-memory privhead structure in which to return parsed information
+ *
+ * This parses the LDM database PRIVHEAD structure supplied in @data and
+ * sets up the in-memory privhead structure @ph with the obtained information.
+ *
+ * Return:  'true'   @ph contains the PRIVHEAD data
+ *          'false'  @ph contents are undefined
+ */
+static bool ldm_parse_privhead(const u8 *data, struct privhead *ph)
+{
+	bool is_vista = false;
+
+	BUG_ON(!data || !ph);
+	if (MAGIC_PRIVHEAD != get_unaligned_be64(data)) {
+		ldm_error("Cannot find PRIVHEAD structure. LDM database is"
+			" corrupt. Aborting.");
+		return false;
+	}
+	ph->ver_major = get_unaligned_be16(data + 0x000C);
+	ph->ver_minor = get_unaligned_be16(data + 0x000E);
+	ph->logical_disk_start = get_unaligned_be64(data + 0x011B);
+	ph->logical_disk_size = get_unaligned_be64(data + 0x0123);
+	ph->config_start = get_unaligned_be64(data + 0x012B);
+	ph->config_size = get_unaligned_be64(data + 0x0133);
+	/* Version 2.11 is Win2k/XP and version 2.12 is Vista. */
+	if (ph->ver_major == 2 && ph->ver_minor == 12)
+		is_vista = true;
+	if (!is_vista && (ph->ver_major != 2 || ph->ver_minor != 11)) {
+		ldm_error("Expected PRIVHEAD version 2.11 or 2.12, got %d.%d."
+			" Aborting.", ph->ver_major, ph->ver_minor);
+		return false;
+	}
+	ldm_debug("PRIVHEAD version %d.%d (Windows %s).", ph->ver_major,
+			ph->ver_minor, is_vista ? "Vista" : "2000/XP");
+	if (ph->config_size != LDM_DB_SIZE) {	/* 1 MiB in sectors. */
+		/* Warn the user and continue, carefully. */
+		ldm_info("Database is normally %u bytes, it claims to "
+			"be %llu bytes.", LDM_DB_SIZE,
+			(unsigned long long)ph->config_size);
+	}
+	if ((ph->logical_disk_size == 0) || (ph->logical_disk_start +
+			ph->logical_disk_size > ph->config_start)) {
+		ldm_error("PRIVHEAD disk size doesn't match real disk size");
+		return false;
+	}
+	if (uuid_parse(data + 0x0030, &ph->disk_id)) {
+		ldm_error("PRIVHEAD contains an invalid GUID.");
+		return false;
+	}
+	ldm_debug("Parsed PRIVHEAD successfully.");
+	return true;
+}
+
+/**
+ * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure
+ * @data:  Raw database TOCBLOCK structure loaded from the device
+ * @toc:   In-memory toc structure in which to return parsed information
+ *
+ * This parses the LDM Database TOCBLOCK (table of contents) structure supplied
+ * in @data and sets up the in-memory tocblock structure @toc with the obtained
+ * information.
+ *
+ * N.B.  The *_start and *_size values returned in @toc are not range-checked.
+ *
+ * Return:  'true'   @toc contains the TOCBLOCK data
+ *          'false'  @toc contents are undefined
+ */
+static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc)
+{
+	BUG_ON (!data || !toc);
+
+	if (MAGIC_TOCBLOCK != get_unaligned_be64(data)) {
+		ldm_crit ("Cannot find TOCBLOCK, database may be corrupt.");
+		return false;
+	}
+	strscpy_pad(toc->bitmap1_name, data + 0x24, sizeof(toc->bitmap1_name));
+	toc->bitmap1_start = get_unaligned_be64(data + 0x2E);
+	toc->bitmap1_size  = get_unaligned_be64(data + 0x36);
+
+	if (strncmp (toc->bitmap1_name, TOC_BITMAP1,
+			sizeof (toc->bitmap1_name)) != 0) {
+		ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.",
+				TOC_BITMAP1, toc->bitmap1_name);
+		return false;
+	}
+	strscpy_pad(toc->bitmap2_name, data + 0x46, sizeof(toc->bitmap2_name));
+	toc->bitmap2_start = get_unaligned_be64(data + 0x50);
+	toc->bitmap2_size  = get_unaligned_be64(data + 0x58);
+	if (strncmp (toc->bitmap2_name, TOC_BITMAP2,
+			sizeof (toc->bitmap2_name)) != 0) {
+		ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.",
+				TOC_BITMAP2, toc->bitmap2_name);
+		return false;
+	}
+	ldm_debug ("Parsed TOCBLOCK successfully.");
+	return true;
+}
+
+/**
+ * ldm_parse_vmdb - Read the LDM Database VMDB structure
+ * @data:  Raw database VMDB structure loaded from the device
+ * @vm:    In-memory vmdb structure in which to return parsed information
+ *
+ * This parses the LDM Database VMDB structure supplied in @data and sets up
+ * the in-memory vmdb structure @vm with the obtained information.
+ *
+ * N.B.  The *_start, *_size and *_seq values will be range-checked later.
+ *
+ * Return:  'true'   @vm contains VMDB info
+ *          'false'  @vm contents are undefined
+ */
+static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm)
+{
+	BUG_ON (!data || !vm);
+
+	if (MAGIC_VMDB != get_unaligned_be32(data)) {
+		ldm_crit ("Cannot find the VMDB, database may be corrupt.");
+		return false;
+	}
+
+	vm->ver_major = get_unaligned_be16(data + 0x12);
+	vm->ver_minor = get_unaligned_be16(data + 0x14);
+	if ((vm->ver_major != 4) || (vm->ver_minor != 10)) {
+		ldm_error ("Expected VMDB version %d.%d, got %d.%d. "
+			"Aborting.", 4, 10, vm->ver_major, vm->ver_minor);
+		return false;
+	}
+
+	vm->vblk_size     = get_unaligned_be32(data + 0x08);
+	if (vm->vblk_size == 0) {
+		ldm_error ("Illegal VBLK size");
+		return false;
+	}
+
+	vm->vblk_offset   = get_unaligned_be32(data + 0x0C);
+	vm->last_vblk_seq = get_unaligned_be32(data + 0x04);
+
+	ldm_debug ("Parsed VMDB successfully.");
+	return true;
+}
+
+/**
+ * ldm_compare_privheads - Compare two privhead objects
+ * @ph1:  First privhead
+ * @ph2:  Second privhead
+ *
+ * This compares the two privhead structures @ph1 and @ph2.
+ *
+ * Return:  'true'   Identical
+ *          'false'  Different
+ */
+static bool ldm_compare_privheads (const struct privhead *ph1,
+				   const struct privhead *ph2)
+{
+	BUG_ON (!ph1 || !ph2);
+
+	return ((ph1->ver_major          == ph2->ver_major)		&&
+		(ph1->ver_minor          == ph2->ver_minor)		&&
+		(ph1->logical_disk_start == ph2->logical_disk_start)	&&
+		(ph1->logical_disk_size  == ph2->logical_disk_size)	&&
+		(ph1->config_start       == ph2->config_start)		&&
+		(ph1->config_size        == ph2->config_size)		&&
+		uuid_equal(&ph1->disk_id, &ph2->disk_id));
+}
+
+/**
+ * ldm_compare_tocblocks - Compare two tocblock objects
+ * @toc1:  First toc
+ * @toc2:  Second toc
+ *
+ * This compares the two tocblock structures @toc1 and @toc2.
+ *
+ * Return:  'true'   Identical
+ *          'false'  Different
+ */
+static bool ldm_compare_tocblocks (const struct tocblock *toc1,
+				   const struct tocblock *toc2)
+{
+	BUG_ON (!toc1 || !toc2);
+
+	return ((toc1->bitmap1_start == toc2->bitmap1_start)	&&
+		(toc1->bitmap1_size  == toc2->bitmap1_size)	&&
+		(toc1->bitmap2_start == toc2->bitmap2_start)	&&
+		(toc1->bitmap2_size  == toc2->bitmap2_size)	&&
+		!strncmp (toc1->bitmap1_name, toc2->bitmap1_name,
+			sizeof (toc1->bitmap1_name))		&&
+		!strncmp (toc1->bitmap2_name, toc2->bitmap2_name,
+			sizeof (toc1->bitmap2_name)));
+}
+
+/**
+ * ldm_validate_privheads - Compare the primary privhead with its backups
+ * @state: Partition check state including device holding the LDM Database
+ * @ph1:   Memory struct to fill with ph contents
+ *
+ * Read and compare all three privheads from disk.
+ *
+ * The privheads on disk show the size and location of the main disk area and
+ * the configuration area (the database).  The values are range-checked against
+ * @hd, which contains the real size of the disk.
+ *
+ * Return:  'true'   Success
+ *          'false'  Error
+ */
+static bool ldm_validate_privheads(struct parsed_partitions *state,
+				   struct privhead *ph1)
+{
+	static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 };
+	struct privhead *ph[3] = { ph1 };
+	Sector sect;
+	u8 *data;
+	bool result = false;
+	long num_sects;
+	int i;
+
+	BUG_ON (!state || !ph1);
+
+	ph[1] = kmalloc_obj(*ph[1]);
+	ph[2] = kmalloc_obj(*ph[2]);
+	if (!ph[1] || !ph[2]) {
+		ldm_crit ("Out of memory.");
+		goto out;
+	}
+
+	/* off[1 & 2] are relative to ph[0]->config_start */
+	ph[0]->config_start = 0;
+
+	/* Read and parse privheads */
+	for (i = 0; i < 3; i++) {
+		data = read_part_sector(state, ph[0]->config_start + off[i],
+					&sect);
+		if (!data) {
+			ldm_crit ("Disk read failed.");
+			goto out;
+		}
+		result = ldm_parse_privhead (data, ph[i]);
+		put_dev_sector (sect);
+		if (!result) {
+			ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */
+			if (i < 2)
+				goto out;	/* Already logged */
+			else
+				break;	/* FIXME ignore for now, 3rd PH can fail on odd-sized disks */
+		}
+	}
+
+	num_sects = get_capacity(state->disk);
+
+	if ((ph[0]->config_start > num_sects) ||
+	   ((ph[0]->config_start + ph[0]->config_size) > num_sects)) {
+		ldm_crit ("Database extends beyond the end of the disk.");
+		goto out;
+	}
+
+	if ((ph[0]->logical_disk_start > ph[0]->config_start) ||
+	   ((ph[0]->logical_disk_start + ph[0]->logical_disk_size)
+		    > ph[0]->config_start)) {
+		ldm_crit ("Disk and database overlap.");
+		goto out;
+	}
+
+	if (!ldm_compare_privheads (ph[0], ph[1])) {
+		ldm_crit ("Primary and backup PRIVHEADs don't match.");
+		goto out;
+	}
+	/* FIXME ignore this for now
+	if (!ldm_compare_privheads (ph[0], ph[2])) {
+		ldm_crit ("Primary and backup PRIVHEADs don't match.");
+		goto out;
+	}*/
+	ldm_debug ("Validated PRIVHEADs successfully.");
+	result = true;
+out:
+	kfree (ph[1]);
+	kfree (ph[2]);
+	return result;
+}
+
+/**
+ * ldm_validate_tocblocks - Validate the table of contents and its backups
+ * @state: Partition check state including device holding the LDM Database
+ * @base:  Offset, into @state->disk, of the database
+ * @ldb:   Cache of the database structures
+ *
+ * Find and compare the four tables of contents of the LDM Database stored on
+ * @state->disk and return the parsed information into @toc1.
+ *
+ * The offsets and sizes of the configs are range-checked against a privhead.
+ *
+ * Return:  'true'   @toc1 contains validated TOCBLOCK info
+ *          'false'  @toc1 contents are undefined
+ */
+static bool ldm_validate_tocblocks(struct parsed_partitions *state,
+				   unsigned long base, struct ldmdb *ldb)
+{
+	static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4};
+	struct tocblock *tb[4];
+	struct privhead *ph;
+	Sector sect;
+	u8 *data;
+	int i, nr_tbs;
+	bool result = false;
+
+	BUG_ON(!state || !ldb);
+	ph = &ldb->ph;
+	tb[0] = &ldb->toc;
+	tb[1] = kmalloc_objs(*tb[1], 3);
+	if (!tb[1]) {
+		ldm_crit("Out of memory.");
+		goto err;
+	}
+	tb[2] = (struct tocblock*)((u8*)tb[1] + sizeof(*tb[1]));
+	tb[3] = (struct tocblock*)((u8*)tb[2] + sizeof(*tb[2]));
+	/*
+	 * Try to read and parse all four TOCBLOCKs.
+	 *
+	 * Windows Vista LDM v2.12 does not always have all four TOCBLOCKs so
+	 * skip any that fail as long as we get at least one valid TOCBLOCK.
+	 */
+	for (nr_tbs = i = 0; i < 4; i++) {
+		data = read_part_sector(state, base + off[i], &sect);
+		if (!data) {
+			ldm_error("Disk read failed for TOCBLOCK %d.", i);
+			continue;
+		}
+		if (ldm_parse_tocblock(data, tb[nr_tbs]))
+			nr_tbs++;
+		put_dev_sector(sect);
+	}
+	if (!nr_tbs) {
+		ldm_crit("Failed to find a valid TOCBLOCK.");
+		goto err;
+	}
+	/* Range check the TOCBLOCK against a privhead. */
+	if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) ||
+			((tb[0]->bitmap2_start + tb[0]->bitmap2_size) >
+			ph->config_size)) {
+		ldm_crit("The bitmaps are out of range.  Giving up.");
+		goto err;
+	}
+	/* Compare all loaded TOCBLOCKs. */
+	for (i = 1; i < nr_tbs; i++) {
+		if (!ldm_compare_tocblocks(tb[0], tb[i])) {
+			ldm_crit("TOCBLOCKs 0 and %d do not match.", i);
+			goto err;
+		}
+	}
+	ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs);
+	result = true;
+err:
+	kfree(tb[1]);
+	return result;
+}
+
+/**
+ * ldm_validate_vmdb - Read the VMDB and validate it
+ * @state: Partition check state including device holding the LDM Database
+ * @base:  Offset, into @bdev, of the database
+ * @ldb:   Cache of the database structures
+ *
+ * Find the vmdb of the LDM Database stored on @bdev and return the parsed
+ * information in @ldb.
+ *
+ * Return:  'true'   @ldb contains validated VBDB info
+ *          'false'  @ldb contents are undefined
+ */
+static bool ldm_validate_vmdb(struct parsed_partitions *state,
+			      unsigned long base, struct ldmdb *ldb)
+{
+	Sector sect;
+	u8 *data;
+	bool result = false;
+	struct vmdb *vm;
+	struct tocblock *toc;
+
+	BUG_ON (!state || !ldb);
+
+	vm  = &ldb->vm;
+	toc = &ldb->toc;
+
+	data = read_part_sector(state, base + OFF_VMDB, &sect);
+	if (!data) {
+		ldm_crit ("Disk read failed.");
+		return false;
+	}
+
+	if (!ldm_parse_vmdb (data, vm))
+		goto out;				/* Already logged */
+
+	/* Are there uncommitted transactions? */
+	if (get_unaligned_be16(data + 0x10) != 0x01) {
+		ldm_crit ("Database is not in a consistent state.  Aborting.");
+		goto out;
+	}
+
+	if (vm->vblk_offset != 512)
+		ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset);
+
+	/*
+	 * The last_vblkd_seq can be before the end of the vmdb, just make sure
+	 * it is not out of bounds.
+	 */
+	if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) {
+		ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK.  "
+				"Database is corrupt.  Aborting.");
+		goto out;
+	}
+
+	result = true;
+out:
+	put_dev_sector (sect);
+	return result;
+}
+
+
+/**
+ * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk
+ * @state: Partition check state including device holding the LDM Database
+ *
+ * This function provides a weak test to decide whether the device is a dynamic
+ * disk or not.  It looks for an MS-DOS-style partition table containing at
+ * least one partition of type 0x42 (formerly SFS, now used by Windows for
+ * dynamic disks).
+ *
+ * N.B.  The only possible error can come from the read_part_sector and that is
+ *       only likely to happen if the underlying device is strange.  If that IS
+ *       the case we should return zero to let someone else try.
+ *
+ * Return:  'true'   @state->disk is a dynamic disk
+ *          'false'  @state->disk is not a dynamic disk, or an error occurred
+ */
+static bool ldm_validate_partition_table(struct parsed_partitions *state)
+{
+	Sector sect;
+	u8 *data;
+	struct msdos_partition *p;
+	int i;
+	bool result = false;
+
+	BUG_ON(!state);
+
+	data = read_part_sector(state, 0, &sect);
+	if (!data) {
+		ldm_info ("Disk read failed.");
+		return false;
+	}
+
+	if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC))
+		goto out;
+
+	p = (struct msdos_partition *)(data + 0x01BE);
+	for (i = 0; i < 4; i++, p++)
+		if (p->sys_ind == LDM_PARTITION) {
+			result = true;
+			break;
+		}
+
+	if (result)
+		ldm_debug ("Found W2K dynamic disk partition type.");
+
+out:
+	put_dev_sector (sect);
+	return result;
+}
+
+/**
+ * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id
+ * @ldb:  Cache of the database structures
+ *
+ * The LDM Database contains a list of all partitions on all dynamic disks.
+ * The primary PRIVHEAD, at the beginning of the physical disk, tells us
+ * the GUID of this disk.  This function searches for the GUID in a linked
+ * list of vblk's.
+ *
+ * Return:  Pointer, A matching vblk was found
+ *          NULL,    No match, or an error
+ */
+static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb)
+{
+	struct list_head *item;
+
+	BUG_ON (!ldb);
+
+	list_for_each (item, &ldb->v_disk) {
+		struct vblk *v = list_entry (item, struct vblk, list);
+		if (uuid_equal(&v->vblk.disk.disk_id, &ldb->ph.disk_id))
+			return v;
+	}
+
+	return NULL;
+}
+
+/**
+ * ldm_create_data_partitions - Create data partitions for this device
+ * @pp:   List of the partitions parsed so far
+ * @ldb:  Cache of the database structures
+ *
+ * The database contains ALL the partitions for ALL disk groups, so we need to
+ * filter out this specific disk. Using the disk's object id, we can find all
+ * the partitions in the database that belong to this disk.
+ *
+ * Add each partition in our database, to the parsed_partitions structure.
+ *
+ * N.B.  This function creates the partitions in the order it finds partition
+ *       objects in the linked list.
+ *
+ * Return:  'true'   Partition created
+ *          'false'  Error, probably a range checking problem
+ */
+static bool ldm_create_data_partitions (struct parsed_partitions *pp,
+					const struct ldmdb *ldb)
+{
+	struct list_head *item;
+	struct vblk *vb;
+	struct vblk *disk;
+	struct vblk_part *part;
+	int part_num = 1;
+
+	BUG_ON (!pp || !ldb);
+
+	disk = ldm_get_disk_objid (ldb);
+	if (!disk) {
+		ldm_crit ("Can't find the ID of this disk in the database.");
+		return false;
+	}
+
+	seq_buf_puts(&pp->pp_buf, " [LDM]");
+
+	/* Create the data partitions */
+	list_for_each (item, &ldb->v_part) {
+		vb = list_entry (item, struct vblk, list);
+		part = &vb->vblk.part;
+
+		if (part->disk_id != disk->obj_id)
+			continue;
+
+		put_partition (pp, part_num, ldb->ph.logical_disk_start +
+				part->start, part->size);
+		part_num++;
+	}
+
+	seq_buf_puts(&pp->pp_buf, "\n");
+	return true;
+}
+
+
+/**
+ * ldm_relative - Calculate the next relative offset
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @base:    Size of the previous fixed width fields
+ * @offset:  Cumulative size of the previous variable-width fields
+ *
+ * Because many of the VBLK fields are variable-width, it's necessary
+ * to calculate each offset based on the previous one and the length
+ * of the field it pointed to.
+ *
+ * Return:  -1 Error, the calculated offset exceeded the size of the buffer
+ *           n OK, a range-checked offset into buffer
+ */
+static int ldm_relative(const u8 *buffer, int buflen, int base, int offset)
+{
+
+	base += offset;
+	if (!buffer || offset < 0 || base > buflen) {
+		if (!buffer)
+			ldm_error("!buffer");
+		if (offset < 0)
+			ldm_error("offset (%d) < 0", offset);
+		if (base > buflen)
+			ldm_error("base (%d) > buflen (%d)", base, buflen);
+		return -1;
+	}
+	if (base + buffer[base] >= buflen) {
+		ldm_error("base (%d) + buffer[base] (%d) >= buflen (%d)", base,
+				buffer[base], buflen);
+		return -1;
+	}
+	return buffer[base] + offset + 1;
+}
+
+/**
+ * ldm_get_vnum - Convert a variable-width, big endian number, into cpu order
+ * @block:  Pointer to the variable-width number to convert
+ *
+ * Large numbers in the LDM Database are often stored in a packed format.  Each
+ * number is prefixed by a one byte width marker.  All numbers in the database
+ * are stored in big-endian byte order.  This function reads one of these
+ * numbers and returns the result
+ *
+ * N.B.  This function DOES NOT perform any range checking, though the most
+ *       it will read is eight bytes.
+ *
+ * Return:  n A number
+ *          0 Zero, or an error occurred
+ */
+static u64 ldm_get_vnum (const u8 *block)
+{
+	u64 tmp = 0;
+	u8 length;
+
+	BUG_ON (!block);
+
+	length = *block++;
+
+	if (length && length <= 8)
+		while (length--)
+			tmp = (tmp << 8) | *block++;
+	else
+		ldm_error ("Illegal length %d.", length);
+
+	return tmp;
+}
+
+/**
+ * ldm_get_vstr - Read a length-prefixed string into a buffer
+ * @block:   Pointer to the length marker
+ * @buffer:  Location to copy string to
+ * @buflen:  Size of the output buffer
+ *
+ * Many of the strings in the LDM Database are not NULL terminated.  Instead
+ * they are prefixed by a one byte length marker.  This function copies one of
+ * these strings into a buffer.
+ *
+ * N.B.  This function DOES NOT perform any range checking on the input.
+ *       If the buffer is too small, the output will be truncated.
+ *
+ * Return:  0, Error and @buffer contents are undefined
+ *          n, String length in characters (excluding NULL)
+ *          buflen-1, String was truncated.
+ */
+static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen)
+{
+	int length;
+
+	BUG_ON (!block || !buffer);
+
+	length = block[0];
+	if (length >= buflen) {
+		ldm_error ("Truncating string %d -> %d.", length, buflen);
+		length = buflen - 1;
+	}
+	memcpy (buffer, block + 1, length);
+	buffer[length] = 0;
+	return length;
+}
+
+
+/**
+ * ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Component object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Component VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+	int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len;
+	struct vblk_comp *comp;
+
+	BUG_ON (!buffer || !vb);
+
+	r_objid  = ldm_relative (buffer, buflen, 0x18, 0);
+	r_name   = ldm_relative (buffer, buflen, 0x18, r_objid);
+	r_vstate = ldm_relative (buffer, buflen, 0x18, r_name);
+	r_child  = ldm_relative (buffer, buflen, 0x1D, r_vstate);
+	r_parent = ldm_relative (buffer, buflen, 0x2D, r_child);
+
+	if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) {
+		r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent);
+		r_cols   = ldm_relative (buffer, buflen, 0x2E, r_stripe);
+		len = r_cols;
+	} else {
+		r_stripe = 0;
+		len = r_parent;
+	}
+	if (len < 0)
+		return false;
+
+	len += VBLK_SIZE_CMP3;
+	if (len != get_unaligned_be32(buffer + 0x14))
+		return false;
+
+	comp = &vb->vblk.comp;
+	ldm_get_vstr (buffer + 0x18 + r_name, comp->state,
+		sizeof (comp->state));
+	comp->type      = buffer[0x18 + r_vstate];
+	comp->children  = ldm_get_vnum (buffer + 0x1D + r_vstate);
+	comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child);
+	comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0;
+
+	return true;
+}
+
+/**
+ * ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk Group object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk Group VBLK
+ *          'false'  @vb contents are not defined
+ */
+static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+	int r_objid, r_name, r_diskid, r_id1, r_id2, len;
+	struct vblk_dgrp *dgrp;
+
+	BUG_ON (!buffer || !vb);
+
+	r_objid  = ldm_relative (buffer, buflen, 0x18, 0);
+	r_name   = ldm_relative (buffer, buflen, 0x18, r_objid);
+	r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
+
+	if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) {
+		r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid);
+		r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1);
+		len = r_id2;
+	} else
+		len = r_diskid;
+	if (len < 0)
+		return false;
+
+	len += VBLK_SIZE_DGR3;
+	if (len != get_unaligned_be32(buffer + 0x14))
+		return false;
+
+	dgrp = &vb->vblk.dgrp;
+	ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id,
+		sizeof (dgrp->disk_id));
+	return true;
+}
+
+/**
+ * ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk Group object (version 4) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk Group VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+	char buf[64];
+	int r_objid, r_name, r_id1, r_id2, len;
+
+	BUG_ON (!buffer || !vb);
+
+	r_objid  = ldm_relative (buffer, buflen, 0x18, 0);
+	r_name   = ldm_relative (buffer, buflen, 0x18, r_objid);
+
+	if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) {
+		r_id1 = ldm_relative (buffer, buflen, 0x44, r_name);
+		r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1);
+		len = r_id2;
+	} else
+		len = r_name;
+	if (len < 0)
+		return false;
+
+	len += VBLK_SIZE_DGR4;
+	if (len != get_unaligned_be32(buffer + 0x14))
+		return false;
+
+	ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf));
+	return true;
+}
+
+/**
+ * ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+	int r_objid, r_name, r_diskid, r_altname, len;
+	struct vblk_disk *disk;
+
+	BUG_ON (!buffer || !vb);
+
+	r_objid   = ldm_relative (buffer, buflen, 0x18, 0);
+	r_name    = ldm_relative (buffer, buflen, 0x18, r_objid);
+	r_diskid  = ldm_relative (buffer, buflen, 0x18, r_name);
+	r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid);
+	len = r_altname;
+	if (len < 0)
+		return false;
+
+	len += VBLK_SIZE_DSK3;
+	if (len != get_unaligned_be32(buffer + 0x14))
+		return false;
+
+	disk = &vb->vblk.disk;
+	ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name,
+		sizeof (disk->alt_name));
+	if (uuid_parse(buffer + 0x19 + r_name, &disk->disk_id))
+		return false;
+
+	return true;
+}
+
+/**
+ * ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk object (version 4) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+	int r_objid, r_name, len;
+	struct vblk_disk *disk;
+
+	BUG_ON (!buffer || !vb);
+
+	r_objid = ldm_relative (buffer, buflen, 0x18, 0);
+	r_name  = ldm_relative (buffer, buflen, 0x18, r_objid);
+	len     = r_name;
+	if (len < 0)
+		return false;
+
+	len += VBLK_SIZE_DSK4;
+	if (len != get_unaligned_be32(buffer + 0x14))
+		return false;
+
+	disk = &vb->vblk.disk;
+	import_uuid(&disk->disk_id, buffer + 0x18 + r_name);
+	return true;
+}
+
+/**
+ * ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Partition object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Partition VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_prt3(const u8 *buffer, int buflen, struct vblk *vb)
+{
+	int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len;
+	struct vblk_part *part;
+
+	BUG_ON(!buffer || !vb);
+	r_objid = ldm_relative(buffer, buflen, 0x18, 0);
+	if (r_objid < 0) {
+		ldm_error("r_objid %d < 0", r_objid);
+		return false;
+	}
+	r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
+	if (r_name < 0) {
+		ldm_error("r_name %d < 0", r_name);
+		return false;
+	}
+	r_size = ldm_relative(buffer, buflen, 0x34, r_name);
+	if (r_size < 0) {
+		ldm_error("r_size %d < 0", r_size);
+		return false;
+	}
+	r_parent = ldm_relative(buffer, buflen, 0x34, r_size);
+	if (r_parent < 0) {
+		ldm_error("r_parent %d < 0", r_parent);
+		return false;
+	}
+	r_diskid = ldm_relative(buffer, buflen, 0x34, r_parent);
+	if (r_diskid < 0) {
+		ldm_error("r_diskid %d < 0", r_diskid);
+		return false;
+	}
+	if (buffer[0x12] & VBLK_FLAG_PART_INDEX) {
+		r_index = ldm_relative(buffer, buflen, 0x34, r_diskid);
+		if (r_index < 0) {
+			ldm_error("r_index %d < 0", r_index);
+			return false;
+		}
+		len = r_index;
+	} else
+		len = r_diskid;
+	if (len < 0) {
+		ldm_error("len %d < 0", len);
+		return false;
+	}
+	len += VBLK_SIZE_PRT3;
+	if (len > get_unaligned_be32(buffer + 0x14)) {
+		ldm_error("len %d > BE32(buffer + 0x14) %d", len,
+				get_unaligned_be32(buffer + 0x14));
+		return false;
+	}
+	part = &vb->vblk.part;
+	part->start = get_unaligned_be64(buffer + 0x24 + r_name);
+	part->volume_offset = get_unaligned_be64(buffer + 0x2C + r_name);
+	part->size = ldm_get_vnum(buffer + 0x34 + r_name);
+	part->parent_id = ldm_get_vnum(buffer + 0x34 + r_size);
+	part->disk_id = ldm_get_vnum(buffer + 0x34 + r_parent);
+	if (vb->flags & VBLK_FLAG_PART_INDEX)
+		part->partnum = buffer[0x35 + r_diskid];
+	else
+		part->partnum = 0;
+	return true;
+}
+
+/**
+ * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Volume object (version 5) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Volume VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_vol5(const u8 *buffer, int buflen, struct vblk *vb)
+{
+	int r_objid, r_name, r_vtype, r_disable_drive_letter, r_child, r_size;
+	int r_id1, r_id2, r_size2, r_drive, len;
+	struct vblk_volu *volu;
+
+	BUG_ON(!buffer || !vb);
+	r_objid = ldm_relative(buffer, buflen, 0x18, 0);
+	if (r_objid < 0) {
+		ldm_error("r_objid %d < 0", r_objid);
+		return false;
+	}
+	r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
+	if (r_name < 0) {
+		ldm_error("r_name %d < 0", r_name);
+		return false;
+	}
+	r_vtype = ldm_relative(buffer, buflen, 0x18, r_name);
+	if (r_vtype < 0) {
+		ldm_error("r_vtype %d < 0", r_vtype);
+		return false;
+	}
+	r_disable_drive_letter = ldm_relative(buffer, buflen, 0x18, r_vtype);
+	if (r_disable_drive_letter < 0) {
+		ldm_error("r_disable_drive_letter %d < 0",
+				r_disable_drive_letter);
+		return false;
+	}
+	r_child = ldm_relative(buffer, buflen, 0x2D, r_disable_drive_letter);
+	if (r_child < 0) {
+		ldm_error("r_child %d < 0", r_child);
+		return false;
+	}
+	r_size = ldm_relative(buffer, buflen, 0x3D, r_child);
+	if (r_size < 0) {
+		ldm_error("r_size %d < 0", r_size);
+		return false;
+	}
+	if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) {
+		r_id1 = ldm_relative(buffer, buflen, 0x52, r_size);
+		if (r_id1 < 0) {
+			ldm_error("r_id1 %d < 0", r_id1);
+			return false;
+		}
+	} else
+		r_id1 = r_size;
+	if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) {
+		r_id2 = ldm_relative(buffer, buflen, 0x52, r_id1);
+		if (r_id2 < 0) {
+			ldm_error("r_id2 %d < 0", r_id2);
+			return false;
+		}
+	} else
+		r_id2 = r_id1;
+	if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) {
+		r_size2 = ldm_relative(buffer, buflen, 0x52, r_id2);
+		if (r_size2 < 0) {
+			ldm_error("r_size2 %d < 0", r_size2);
+			return false;
+		}
+	} else
+		r_size2 = r_id2;
+	if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
+		r_drive = ldm_relative(buffer, buflen, 0x52, r_size2);
+		if (r_drive < 0) {
+			ldm_error("r_drive %d < 0", r_drive);
+			return false;
+		}
+	} else
+		r_drive = r_size2;
+	len = r_drive;
+	if (len < 0) {
+		ldm_error("len %d < 0", len);
+		return false;
+	}
+	len += VBLK_SIZE_VOL5;
+	if (len > get_unaligned_be32(buffer + 0x14)) {
+		ldm_error("len %d > BE32(buffer + 0x14) %d", len,
+				get_unaligned_be32(buffer + 0x14));
+		return false;
+	}
+	volu = &vb->vblk.volu;
+	ldm_get_vstr(buffer + 0x18 + r_name, volu->volume_type,
+			sizeof(volu->volume_type));
+	memcpy(volu->volume_state, buffer + 0x18 + r_disable_drive_letter,
+			sizeof(volu->volume_state));
+	volu->size = ldm_get_vnum(buffer + 0x3D + r_child);
+	volu->partition_type = buffer[0x41 + r_size];
+	memcpy(volu->guid, buffer + 0x42 + r_size, sizeof(volu->guid));
+	if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
+		ldm_get_vstr(buffer + 0x52 + r_size, volu->drive_hint,
+				sizeof(volu->drive_hint));
+	}
+	return true;
+}
+
+/**
+ * ldm_parse_vblk - Read a raw VBLK object into a vblk structure
+ * @buf:  Block of data being worked on
+ * @len:  Size of the block of data
+ * @vb:   In-memory vblk in which to return information
+ *
+ * Read a raw VBLK object into a vblk structure.  This function just reads the
+ * information common to all VBLK types, then delegates the rest of the work to
+ * helper functions: ldm_parse_*.
+ *
+ * Return:  'true'   @vb contains a VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)
+{
+	bool result = false;
+	int r_objid;
+
+	BUG_ON (!buf || !vb);
+
+	r_objid = ldm_relative (buf, len, 0x18, 0);
+	if (r_objid < 0) {
+		ldm_error ("VBLK header is corrupt.");
+		return false;
+	}
+
+	vb->flags  = buf[0x12];
+	vb->type   = buf[0x13];
+	vb->obj_id = ldm_get_vnum (buf + 0x18);
+	ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name));
+
+	switch (vb->type) {
+		case VBLK_CMP3:  result = ldm_parse_cmp3 (buf, len, vb); break;
+		case VBLK_DSK3:  result = ldm_parse_dsk3 (buf, len, vb); break;
+		case VBLK_DSK4:  result = ldm_parse_dsk4 (buf, len, vb); break;
+		case VBLK_DGR3:  result = ldm_parse_dgr3 (buf, len, vb); break;
+		case VBLK_DGR4:  result = ldm_parse_dgr4 (buf, len, vb); break;
+		case VBLK_PRT3:  result = ldm_parse_prt3 (buf, len, vb); break;
+		case VBLK_VOL5:  result = ldm_parse_vol5 (buf, len, vb); break;
+	}
+
+	if (result)
+		ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",
+			 (unsigned long long) vb->obj_id, vb->type);
+	else
+		ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",
+			(unsigned long long) vb->obj_id, vb->type);
+
+	return result;
+}
+
+
+/**
+ * ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database
+ * @data:  Raw VBLK to add to the database
+ * @len:   Size of the raw VBLK
+ * @ldb:   Cache of the database structures
+ *
+ * The VBLKs are sorted into categories.  Partitions are also sorted by offset.
+ *
+ * N.B.  This function does not check the validity of the VBLKs.
+ *
+ * Return:  'true'   The VBLK was added
+ *          'false'  An error occurred
+ */
+static bool ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb)
+{
+	struct vblk *vb;
+	struct list_head *item;
+
+	BUG_ON (!data || !ldb);
+
+	vb = kmalloc_obj(*vb);
+	if (!vb) {
+		ldm_crit ("Out of memory.");
+		return false;
+	}
+
+	if (!ldm_parse_vblk (data, len, vb)) {
+		kfree(vb);
+		return false;			/* Already logged */
+	}
+
+	/* Put vblk into the correct list. */
+	switch (vb->type) {
+	case VBLK_DGR3:
+	case VBLK_DGR4:
+		list_add (&vb->list, &ldb->v_dgrp);
+		break;
+	case VBLK_DSK3:
+	case VBLK_DSK4:
+		list_add (&vb->list, &ldb->v_disk);
+		break;
+	case VBLK_VOL5:
+		list_add (&vb->list, &ldb->v_volu);
+		break;
+	case VBLK_CMP3:
+		list_add (&vb->list, &ldb->v_comp);
+		break;
+	case VBLK_PRT3:
+		/* Sort by the partition's start sector. */
+		list_for_each (item, &ldb->v_part) {
+			struct vblk *v = list_entry (item, struct vblk, list);
+			if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) &&
+			    (v->vblk.part.start > vb->vblk.part.start)) {
+				list_add_tail (&vb->list, &v->list);
+				return true;
+			}
+		}
+		list_add_tail (&vb->list, &ldb->v_part);
+		break;
+	}
+	return true;
+}
+
+/**
+ * ldm_frag_add - Add a VBLK fragment to a list
+ * @data:   Raw fragment to be added to the list
+ * @size:   Size of the raw fragment
+ * @frags:  Linked list of VBLK fragments
+ *
+ * Fragmented VBLKs may not be consecutive in the database, so they are placed
+ * in a list so they can be pieced together later.
+ *
+ * Return:  'true'   Success, the VBLK was added to the list
+ *          'false'  Error, a problem occurred
+ */
+static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags)
+{
+	struct frag *f;
+	struct list_head *item;
+	int rec, num, group;
+
+	BUG_ON (!data || !frags);
+
+	if (size < 2 * VBLK_SIZE_HEAD) {
+		ldm_error("Value of size is too small.");
+		return false;
+	}
+
+	group = get_unaligned_be32(data + 0x08);
+	rec   = get_unaligned_be16(data + 0x0C);
+	num   = get_unaligned_be16(data + 0x0E);
+	if ((num < 1) || (num > 4)) {
+		ldm_error ("A VBLK claims to have %d parts.", num);
+		return false;
+	}
+	if (rec >= num) {
+		ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num);
+		return false;
+	}
+
+	list_for_each (item, frags) {
+		f = list_entry (item, struct frag, list);
+		if (f->group == group)
+			goto found;
+	}
+
+	f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL);
+	if (!f) {
+		ldm_crit ("Out of memory.");
+		return false;
+	}
+
+	f->group = group;
+	f->num   = num;
+	f->rec   = rec;
+	f->map   = 0xFF << num;
+
+	list_add_tail (&f->list, frags);
+found:
+	if (rec >= f->num) {
+		ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num);
+		return false;
+	}
+	if (f->map & (1 << rec)) {
+		ldm_error ("Duplicate VBLK, part %d.", rec);
+		f->map &= 0x7F;			/* Mark the group as broken */
+		return false;
+	}
+	f->map |= (1 << rec);
+	if (!rec)
+		memcpy(f->data, data, VBLK_SIZE_HEAD);
+	data += VBLK_SIZE_HEAD;
+	size -= VBLK_SIZE_HEAD;
+	memcpy(f->data + VBLK_SIZE_HEAD + rec * size, data, size);
+	return true;
+}
+
+/**
+ * ldm_frag_free - Free a linked list of VBLK fragments
+ * @list:  Linked list of fragments
+ *
+ * Free a linked list of VBLK fragments
+ *
+ * Return:  none
+ */
+static void ldm_frag_free (struct list_head *list)
+{
+	struct list_head *item, *tmp;
+
+	BUG_ON (!list);
+
+	list_for_each_safe (item, tmp, list)
+		kfree (list_entry (item, struct frag, list));
+}
+
+/**
+ * ldm_frag_commit - Validate fragmented VBLKs and add them to the database
+ * @frags:  Linked list of VBLK fragments
+ * @ldb:    Cache of the database structures
+ *
+ * Now that all the fragmented VBLKs have been collected, they must be added to
+ * the database for later use.
+ *
+ * Return:  'true'   All the fragments we added successfully
+ *          'false'  One or more of the fragments we invalid
+ */
+static bool ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb)
+{
+	struct frag *f;
+	struct list_head *item;
+
+	BUG_ON (!frags || !ldb);
+
+	list_for_each (item, frags) {
+		f = list_entry (item, struct frag, list);
+
+		if (f->map != 0xFF) {
+			ldm_error ("VBLK group %d is incomplete (0x%02x).",
+				f->group, f->map);
+			return false;
+		}
+
+		if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb))
+			return false;		/* Already logged */
+	}
+	return true;
+}
+
+/**
+ * ldm_get_vblks - Read the on-disk database of VBLKs into memory
+ * @state: Partition check state including device holding the LDM Database
+ * @base:  Offset, into @state->disk, of the database
+ * @ldb:   Cache of the database structures
+ *
+ * To use the information from the VBLKs, they need to be read from the disk,
+ * unpacked and validated.  We cache them in @ldb according to their type.
+ *
+ * Return:  'true'   All the VBLKs were read successfully
+ *          'false'  An error occurred
+ */
+static bool ldm_get_vblks(struct parsed_partitions *state, unsigned long base,
+			  struct ldmdb *ldb)
+{
+	int size, perbuf, skip, finish, s, v, recs;
+	u8 *data = NULL;
+	Sector sect;
+	bool result = false;
+	LIST_HEAD (frags);
+
+	BUG_ON(!state || !ldb);
+
+	size   = ldb->vm.vblk_size;
+	perbuf = 512 / size;
+	skip   = ldb->vm.vblk_offset >> 9;		/* Bytes to sectors */
+	finish = (size * ldb->vm.last_vblk_seq) >> 9;
+
+	for (s = skip; s < finish; s++) {		/* For each sector */
+		data = read_part_sector(state, base + OFF_VMDB + s, &sect);
+		if (!data) {
+			ldm_crit ("Disk read failed.");
+			goto out;
+		}
+
+		for (v = 0; v < perbuf; v++, data+=size) {  /* For each vblk */
+			if (MAGIC_VBLK != get_unaligned_be32(data)) {
+				ldm_error ("Expected to find a VBLK.");
+				goto out;
+			}
+
+			recs = get_unaligned_be16(data + 0x0E);	/* Number of records */
+			if (recs == 1) {
+				if (!ldm_ldmdb_add (data, size, ldb))
+					goto out;	/* Already logged */
+			} else if (recs > 1) {
+				if (!ldm_frag_add (data, size, &frags))
+					goto out;	/* Already logged */
+			}
+			/* else Record is not in use, ignore it. */
+		}
+		put_dev_sector (sect);
+		data = NULL;
+	}
+
+	result = ldm_frag_commit (&frags, ldb);	/* Failures, already logged */
+out:
+	if (data)
+		put_dev_sector (sect);
+	ldm_frag_free (&frags);
+
+	return result;
+}
+
+/**
+ * ldm_free_vblks - Free a linked list of vblk's
+ * @lh:  Head of a linked list of struct vblk
+ *
+ * Free a list of vblk's and free the memory used to maintain the list.
+ *
+ * Return:  none
+ */
+static void ldm_free_vblks (struct list_head *lh)
+{
+	struct list_head *item, *tmp;
+
+	BUG_ON (!lh);
+
+	list_for_each_safe (item, tmp, lh)
+		kfree (list_entry (item, struct vblk, list));
+}
+
+
+/**
+ * ldm_partition - Find out whether a device is a dynamic disk and handle it
+ * @state: Partition check state including device holding the LDM Database
+ *
+ * This determines whether the device @bdev is a dynamic disk and if so creates
+ * the partitions necessary in the gendisk structure pointed to by @hd.
+ *
+ * We create a dummy device 1, which contains the LDM database, and then create
+ * each partition described by the LDM database in sequence as devices 2+. For
+ * example, if the device is hda, we would have: hda1: LDM database, hda2, hda3,
+ * and so on: the actual data containing partitions.
+ *
+ * Return:  1 Success, @state->disk is a dynamic disk and we handled it
+ *          0 Success, @state->disk is not a dynamic disk
+ *         -1 An error occurred before enough information had been read
+ *            Or @state->disk is a dynamic disk, but it may be corrupted
+ */
+int ldm_partition(struct parsed_partitions *state)
+{
+	struct ldmdb  *ldb;
+	unsigned long base;
+	int result = -1;
+
+	BUG_ON(!state);
+
+	/* Look for signs of a Dynamic Disk */
+	if (!ldm_validate_partition_table(state))
+		return 0;
+
+	ldb = kmalloc_obj(*ldb);
+	if (!ldb) {
+		ldm_crit ("Out of memory.");
+		goto out;
+	}
+
+	/* Parse and check privheads. */
+	if (!ldm_validate_privheads(state, &ldb->ph))
+		goto out;		/* Already logged */
+
+	/* All further references are relative to base (database start). */
+	base = ldb->ph.config_start;
+
+	/* Parse and check tocs and vmdb. */
+	if (!ldm_validate_tocblocks(state, base, ldb) ||
+	    !ldm_validate_vmdb(state, base, ldb))
+	    	goto out;		/* Already logged */
+
+	/* Initialize vblk lists in ldmdb struct */
+	INIT_LIST_HEAD (&ldb->v_dgrp);
+	INIT_LIST_HEAD (&ldb->v_disk);
+	INIT_LIST_HEAD (&ldb->v_volu);
+	INIT_LIST_HEAD (&ldb->v_comp);
+	INIT_LIST_HEAD (&ldb->v_part);
+
+	if (!ldm_get_vblks(state, base, ldb)) {
+		ldm_crit ("Failed to read the VBLKs from the database.");
+		goto cleanup;
+	}
+
+	/* Finally, create the data partition devices. */
+	if (ldm_create_data_partitions(state, ldb)) {
+		ldm_debug ("Parsed LDM database successfully.");
+		result = 1;
+	}
+	/* else Already logged */
+
+cleanup:
+	ldm_free_vblks (&ldb->v_dgrp);
+	ldm_free_vblks (&ldb->v_disk);
+	ldm_free_vblks (&ldb->v_volu);
+	ldm_free_vblks (&ldb->v_comp);
+	ldm_free_vblks (&ldb->v_part);
+out:
+	kfree (ldb);
+	return result;
+}
diff --git a/block/partitions/ldm.h b/block/partitions/ldm.h
new file mode 100644
index 000000000..aa3bd050d
--- /dev/null
+++ b/block/partitions/ldm.h
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ldm - Part of the Linux-NTFS project.
+ *
+ * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
+ * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
+ *
+ * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads 
+ */
+
+#ifndef _FS_PT_LDM_H_
+#define _FS_PT_LDM_H_
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/unaligned.h>
+#include <asm/byteorder.h>
+
+struct parsed_partitions;
+
+/* Magic numbers in CPU format. */
+#define MAGIC_VMDB	0x564D4442		/* VMDB */
+#define MAGIC_VBLK	0x56424C4B		/* VBLK */
+#define MAGIC_PRIVHEAD	0x5052495648454144ULL	/* PRIVHEAD */
+#define MAGIC_TOCBLOCK	0x544F43424C4F434BULL	/* TOCBLOCK */
+
+/* The defined vblk types. */
+#define VBLK_VOL5		0x51		/* Volume,     version 5 */
+#define VBLK_CMP3		0x32		/* Component,  version 3 */
+#define VBLK_PRT3		0x33		/* Partition,  version 3 */
+#define VBLK_DSK3		0x34		/* Disk,       version 3 */
+#define VBLK_DSK4		0x44		/* Disk,       version 4 */
+#define VBLK_DGR3		0x35		/* Disk Group, version 3 */
+#define VBLK_DGR4		0x45		/* Disk Group, version 4 */
+
+/* vblk flags indicating extra information will be present */
+#define	VBLK_FLAG_COMP_STRIPE	0x10
+#define	VBLK_FLAG_PART_INDEX	0x08
+#define	VBLK_FLAG_DGR3_IDS	0x08
+#define	VBLK_FLAG_DGR4_IDS	0x08
+#define	VBLK_FLAG_VOLU_ID1	0x08
+#define	VBLK_FLAG_VOLU_ID2	0x20
+#define	VBLK_FLAG_VOLU_SIZE	0x80
+#define	VBLK_FLAG_VOLU_DRIVE	0x02
+
+/* size of a vblk's static parts */
+#define VBLK_SIZE_HEAD		16
+#define VBLK_SIZE_CMP3		22		/* Name and version */
+#define VBLK_SIZE_DGR3		12
+#define VBLK_SIZE_DGR4		44
+#define VBLK_SIZE_DSK3		12
+#define VBLK_SIZE_DSK4		45
+#define VBLK_SIZE_PRT3		28
+#define VBLK_SIZE_VOL5		58
+
+/* component types */
+#define COMP_STRIPE		0x01		/* Stripe-set */
+#define COMP_BASIC		0x02		/* Basic disk */
+#define COMP_RAID		0x03		/* Raid-set */
+
+/* Other constants. */
+#define LDM_DB_SIZE		2048		/* Size in sectors (= 1MiB). */
+
+#define OFF_PRIV1		6		/* Offset of the first privhead
+						   relative to the start of the
+						   device in sectors */
+
+/* Offsets to structures within the LDM Database in sectors. */
+#define OFF_PRIV2		1856		/* Backup private headers. */
+#define OFF_PRIV3		2047
+
+#define OFF_TOCB1		1		/* Tables of contents. */
+#define OFF_TOCB2		2
+#define OFF_TOCB3		2045
+#define OFF_TOCB4		2046
+
+#define OFF_VMDB		17		/* List of partitions. */
+
+#define LDM_PARTITION		0x42		/* Formerly SFS (Landis). */
+
+#define TOC_BITMAP1		"config"	/* Names of the two defined */
+#define TOC_BITMAP2		"log"		/* bitmaps in the TOCBLOCK. */
+
+struct frag {				/* VBLK Fragment handling */
+	struct list_head list;
+	u32		group;
+	u8		num;		/* Total number of records */
+	u8		rec;		/* This is record number n */
+	u8		map;		/* Which portions are in use */
+	u8		data[];
+};
+
+/* In memory LDM database structures. */
+
+struct privhead {			/* Offsets and sizes are in sectors. */
+	u16	ver_major;
+	u16	ver_minor;
+	u64	logical_disk_start;
+	u64	logical_disk_size;
+	u64	config_start;
+	u64	config_size;
+	uuid_t	disk_id;
+};
+
+struct tocblock {			/* We have exactly two bitmaps. */
+	u8	bitmap1_name[16];
+	u64	bitmap1_start;
+	u64	bitmap1_size;
+	u8	bitmap2_name[16];
+	u64	bitmap2_start;
+	u64	bitmap2_size;
+};
+
+struct vmdb {				/* VMDB: The database header */
+	u16	ver_major;
+	u16	ver_minor;
+	u32	vblk_size;
+	u32	vblk_offset;
+	u32	last_vblk_seq;
+};
+
+struct vblk_comp {			/* VBLK Component */
+	u8	state[16];
+	u64	parent_id;
+	u8	type;
+	u8	children;
+	u16	chunksize;
+};
+
+struct vblk_dgrp {			/* VBLK Disk Group */
+	u8	disk_id[64];
+};
+
+struct vblk_disk {			/* VBLK Disk */
+	uuid_t	disk_id;
+	u8	alt_name[128];
+};
+
+struct vblk_part {			/* VBLK Partition */
+	u64	start;
+	u64	size;			/* start, size and vol_off in sectors */
+	u64	volume_offset;
+	u64	parent_id;
+	u64	disk_id;
+	u8	partnum;
+};
+
+struct vblk_volu {			/* VBLK Volume */
+	u8	volume_type[16];
+	u8	volume_state[16];
+	u8	guid[16];
+	u8	drive_hint[4];
+	u64	size;
+	u8	partition_type;
+};
+
+struct vblk_head {			/* VBLK standard header */
+	u32 group;
+	u16 rec;
+	u16 nrec;
+};
+
+struct vblk {				/* Generalised VBLK */
+	u8	name[64];
+	u64	obj_id;
+	u32	sequence;
+	u8	flags;
+	u8	type;
+	union {
+		struct vblk_comp comp;
+		struct vblk_dgrp dgrp;
+		struct vblk_disk disk;
+		struct vblk_part part;
+		struct vblk_volu volu;
+	} vblk;
+	struct list_head list;
+};
+
+struct ldmdb {				/* Cache of the database */
+	struct privhead ph;
+	struct tocblock toc;
+	struct vmdb     vm;
+	struct list_head v_dgrp;
+	struct list_head v_disk;
+	struct list_head v_volu;
+	struct list_head v_comp;
+	struct list_head v_part;
+};
+
+#endif /* _FS_PT_LDM_H_ */
+
diff --git a/block/partitions/mac.c b/block/partitions/mac.c
new file mode 100644
index 000000000..df03ca428
--- /dev/null
+++ b/block/partitions/mac.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  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.
+ */
+
+#ifdef CONFIG_PPC_PMAC
+static inline void mac_fix_string(char *stg, int len)
+{
+	int i;
+
+	for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
+		stg[i] = 0;
+}
+#endif
+
+int mac_partition(struct parsed_partitions *state)
+{
+	Sector sect;
+	unsigned char *data;
+	int slot, blocks_in_map;
+	unsigned secsize, datasize, partoffset;
+#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);
+
+	/*
+	 * If the "block size" is not a power of 2, things get weird - we might
+	 * end up with a partition straddling a sector boundary, so we wouldn't
+	 * be able to read a partition entry with read_part_sector().
+	 * Real block sizes are probably (?) powers of two, so just require
+	 * that.
+	 */
+	if (!is_power_of_2(secsize))
+		return -1;
+	datasize = round_down(secsize, 512);
+	data = read_part_sector(state, datasize / 512, &sect);
+	if (!data)
+		return -1;
+	partoffset = secsize % 512;
+	if (partoffset + sizeof(*part) > datasize) {
+		put_dev_sector(sect);
+		return -1;
+	}
+	part = (struct mac_partition *) (data + partoffset);
+	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;
+	}
+
+	if (blocks_in_map >= state->limit)
+		blocks_in_map = state->limit - 1;
+
+	seq_buf_puts(&state->pp_buf, " [mac]");
+	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 (!strncasecmp(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
+			    || (strncasecmp(part->type, "Linux", 5) == 0
+			        && strcasecmp(part->type, "Linux_swap") != 0)) {
+				int i, l;
+
+				goodness++;
+				l = strnlen(part->name, sizeof(part->name));
+				if (strncmp(part->name, "/", sizeof(part->name)) == 0)
+					goodness++;
+				for (i = 0; i <= l - 4; ++i) {
+					if (strncasecmp(part->name + i, "root",
+						     4) == 0) {
+						goodness += 2;
+						break;
+					}
+				}
+				if (strncasecmp(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->disk->part0->bd_dev, found_root,
+				   found_root_goodness);
+#endif
+
+	put_dev_sector(sect);
+	seq_buf_puts(&state->pp_buf, "\n");
+	return 1;
+}
diff --git a/block/partitions/mac.h b/block/partitions/mac.h
new file mode 100644
index 000000000..0e41c9da7
--- /dev/null
+++ b/block/partitions/mac.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  fs/partitions/mac.h
+ */
+
+#define MAC_PARTITION_MAGIC	0x504d
+
+/* type field value for A/UX or other Unix partitions */
+#define APPLE_AUX_TYPE	"Apple_UNIX_SVR2"
+
+struct mac_partition {
+	__be16	signature;	/* expected to be MAC_PARTITION_MAGIC */
+	__be16	res1;
+	__be32	map_count;	/* # blocks in partition map */
+	__be32	start_block;	/* absolute starting block # of partition */
+	__be32	block_count;	/* number of blocks in partition */
+	char	name[32];	/* partition name */
+	char	type[32];	/* string type description */
+	__be32	data_start;	/* rel block # of first data block */
+	__be32	data_count;	/* number of data blocks */
+	__be32	status;		/* partition status bits */
+	__be32	boot_start;
+	__be32	boot_size;
+	__be32	boot_load;
+	__be32	boot_load2;
+	__be32	boot_entry;
+	__be32	boot_entry2;
+	__be32	boot_cksum;
+	char	processor[16];	/* identifies ISA of boot */
+	/* there is more stuff after this that we don't need */
+};
+
+#define MAC_STATUS_BOOTABLE	8	/* partition is bootable */
+
+#define MAC_DRIVER_MAGIC	0x4552
+
+/* Driver descriptor structure, in block 0 */
+struct mac_driver_desc {
+	__be16	signature;	/* expected to be MAC_DRIVER_MAGIC */
+	__be16	block_size;
+	__be32	block_count;
+    /* ... more stuff */
+};
+
diff --git a/block/partitions/msdos.c b/block/partitions/msdos.c
new file mode 100644
index 000000000..200ea53ea
--- /dev/null
+++ b/block/partitions/msdos.c
@@ -0,0 +1,696 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/msdos.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  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
+ *
+ *  BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
+ *  updated by Marc Espie <Marc.Espie@openbsd.org>
+ *
+ *  Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
+ *  and Krzysztof G. Baranowski <kgb@knm.org.pl>
+ */
+#include <linux/msdos_fs.h>
+#include <linux/msdos_partition.h>
+
+#include "check.h"
+#include "efi.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 <linux/unaligned.h>
+
+static inline sector_t nr_sects(struct msdos_partition *p)
+{
+	return (sector_t)get_unaligned_le32(&p->nr_sects);
+}
+
+static inline sector_t start_sect(struct msdos_partition *p)
+{
+	return (sector_t)get_unaligned_le32(&p->start_sect);
+}
+
+static inline int is_extended_partition(struct msdos_partition *p)
+{
+	return (p->sys_ind == DOS_EXTENDED_PARTITION ||
+		p->sys_ind == WIN98_EXTENDED_PARTITION ||
+		p->sys_ind == 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);
+}
+
+/* Value is EBCDIC 'IBMA' */
+#define AIX_LABEL_MAGIC1	0xC9
+#define AIX_LABEL_MAGIC2	0xC2
+#define AIX_LABEL_MAGIC3	0xD4
+#define AIX_LABEL_MAGIC4	0xC1
+static int aix_magic_present(struct parsed_partitions *state, unsigned char *p)
+{
+	struct msdos_partition *pt = (struct msdos_partition *) (p + 0x1be);
+	Sector sect;
+	unsigned char *d;
+	int slot, ret = 0;
+
+	if (!(p[0] == AIX_LABEL_MAGIC1 &&
+		p[1] == AIX_LABEL_MAGIC2 &&
+		p[2] == AIX_LABEL_MAGIC3 &&
+		p[3] == AIX_LABEL_MAGIC4))
+		return 0;
+
+	/*
+	 * Assume the partition table is valid if Linux partitions exists.
+	 * Note that old Solaris/x86 partitions use the same indicator as
+	 * Linux swap partitions, so we consider that a Linux partition as
+	 * well.
+	 */
+	for (slot = 1; slot <= 4; slot++, pt++) {
+		if (pt->sys_ind == SOLARIS_X86_PARTITION ||
+		    pt->sys_ind == LINUX_RAID_PARTITION ||
+		    pt->sys_ind == LINUX_DATA_PARTITION ||
+		    pt->sys_ind == LINUX_LVM_PARTITION ||
+		    is_extended_partition(pt))
+			return 0;
+	}
+	d = read_part_sector(state, 7, &sect);
+	if (d) {
+		if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
+			ret = 1;
+		put_dev_sector(sect);
+	}
+	return ret;
+}
+
+static void set_info(struct parsed_partitions *state, int slot,
+		     u32 disksig)
+{
+	struct partition_meta_info *info = &state->parts[slot].info;
+
+	snprintf(info->uuid, sizeof(info->uuid), "%08x-%02x", disksig,
+		 slot);
+	info->volname[0] = 0;
+	state->parts[slot].has_info = true;
+}
+
+/*
+ * 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,
+			   sector_t first_sector, sector_t first_size,
+			   u32 disksig)
+{
+	struct msdos_partition *p;
+	Sector sect;
+	unsigned char *data;
+	sector_t this_sector, this_size;
+	sector_t sector_size;
+	int loopct = 0;		/* number of links followed
+				   without finding a data partition */
+	int i;
+
+	sector_size = queue_logical_block_size(state->disk->queue) / 512;
+	this_sector = first_sector;
+	this_size = first_size;
+
+	while (1) {
+		if (++loopct > 100)
+			return;
+		if (state->next == state->limit)
+			return;
+		data = read_part_sector(state, this_sector, &sect);
+		if (!data)
+			return;
+
+		if (!msdos_magic_present(data + 510))
+			goto done;
+
+		p = (struct msdos_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++) {
+			sector_t 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);
+			set_info(state, state->next, disksig);
+			if (p->sys_ind == LINUX_RAID_PARTITION)
+				state->parts[state->next].flags = ADDPART_FLAG_RAID;
+			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);
+}
+
+#define SOLARIS_X86_NUMSLICE	16
+#define SOLARIS_X86_VTOC_SANE	(0x600DDEEEUL)
+
+struct solaris_x86_slice {
+	__le16 s_tag;		/* ID tag of partition */
+	__le16 s_flag;		/* permission flags */
+	__le32 s_start;		/* start sector no of partition */
+	__le32 s_size;		/* # of blocks in partition */
+};
+
+struct solaris_x86_vtoc {
+	unsigned int v_bootinfo[3];	/* info needed by mboot */
+	__le32 v_sanity;		/* to verify vtoc sanity */
+	__le32 v_version;		/* layout version */
+	char	v_volume[8];		/* volume name */
+	__le16	v_sectorsz;		/* sector size in bytes */
+	__le16	v_nparts;		/* number of partitions */
+	unsigned int v_reserved[10];	/* free space */
+	struct solaris_x86_slice
+		v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
+	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp */
+	char	v_asciilabel[128];	/* for compatibility */
+};
+
+/* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
+   indicates linux swap.  Be careful before believing this is Solaris. */
+
+static void parse_solaris_x86(struct parsed_partitions *state,
+			      sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_SOLARIS_X86_PARTITION
+	Sector sect;
+	struct solaris_x86_vtoc *v;
+	int i;
+	short max_nparts;
+
+	v = read_part_sector(state, offset + 1, &sect);
+	if (!v)
+		return;
+	if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
+		put_dev_sector(sect);
+		return;
+	}
+	seq_buf_printf(&state->pp_buf, " %s%d: <solaris:", state->name, origin);
+	if (le32_to_cpu(v->v_version) != 1) {
+		seq_buf_printf(&state->pp_buf,
+			       "  cannot handle version %d vtoc>\n",
+			       le32_to_cpu(v->v_version));
+		put_dev_sector(sect);
+		return;
+	}
+	/* Ensure we can handle previous case of VTOC with 8 entries gracefully */
+	max_nparts = le16_to_cpu(v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8;
+	for (i = 0; i < max_nparts && state->next < state->limit; i++) {
+		struct solaris_x86_slice *s = &v->v_slice[i];
+
+		if (s->s_size == 0)
+			continue;
+		seq_buf_printf(&state->pp_buf, " [s%d]", i);
+		/* solaris partitions are relative to current MS-DOS
+		 * one; must add the offset of the current partition */
+		put_partition(state, state->next++,
+				 le32_to_cpu(s->s_start)+offset,
+				 le32_to_cpu(s->s_size));
+	}
+	put_dev_sector(sect);
+	seq_buf_puts(&state->pp_buf, " >\n");
+#endif
+}
+
+/* check against BSD src/sys/sys/disklabel.h for consistency */
+#define BSD_DISKMAGIC	(0x82564557UL)	/* The disk magic number */
+#define BSD_MAXPARTITIONS	16
+#define OPENBSD_MAXPARTITIONS	16
+#define BSD_FS_UNUSED		0 /* disklabel unused partition entry ID */
+struct bsd_disklabel {
+	__le32	d_magic;		/* the magic number */
+	__s16	d_type;			/* drive type */
+	__s16	d_subtype;		/* controller/d_type specific */
+	char	d_typename[16];		/* type name, e.g. "eagle" */
+	char	d_packname[16];		/* pack identifier */
+	__u32	d_secsize;		/* # of bytes per sector */
+	__u32	d_nsectors;		/* # of data sectors per track */
+	__u32	d_ntracks;		/* # of tracks per cylinder */
+	__u32	d_ncylinders;		/* # of data cylinders per unit */
+	__u32	d_secpercyl;		/* # of data sectors per cylinder */
+	__u32	d_secperunit;		/* # of data sectors per unit */
+	__u16	d_sparespertrack;	/* # of spare sectors per track */
+	__u16	d_sparespercyl;		/* # of spare sectors per cylinder */
+	__u32	d_acylinders;		/* # of alt. cylinders per unit */
+	__u16	d_rpm;			/* rotational speed */
+	__u16	d_interleave;		/* hardware sector interleave */
+	__u16	d_trackskew;		/* sector 0 skew, per track */
+	__u16	d_cylskew;		/* sector 0 skew, per cylinder */
+	__u32	d_headswitch;		/* head switch time, usec */
+	__u32	d_trkseek;		/* track-to-track seek, usec */
+	__u32	d_flags;		/* generic flags */
+#define NDDATA 5
+	__u32	d_drivedata[NDDATA];	/* drive-type specific information */
+#define NSPARE 5
+	__u32	d_spare[NSPARE];	/* reserved for future use */
+	__le32	d_magic2;		/* the magic number (again) */
+	__le16	d_checksum;		/* xor of data incl. partitions */
+
+			/* filesystem and partition information: */
+	__le16	d_npartitions;		/* number of partitions in following */
+	__le32	d_bbsize;		/* size of boot area at sn0, bytes */
+	__le32	d_sbsize;		/* max size of fs superblock, bytes */
+	struct	bsd_partition {		/* the partition table */
+		__le32	p_size;		/* number of sectors in partition */
+		__le32	p_offset;	/* starting sector */
+		__le32	p_fsize;	/* filesystem basic fragment size */
+		__u8	p_fstype;	/* filesystem type, see below */
+		__u8	p_frag;		/* filesystem fragments per block */
+		__le16	p_cpg;		/* filesystem cylinders per group */
+	} d_partitions[BSD_MAXPARTITIONS];	/* actually may be more */
+};
+
+#if defined(CONFIG_BSD_DISKLABEL)
+/*
+ * Create devices for BSD partitions listed in a disklabel, under a
+ * dos-like partition. See parse_extended() for more information.
+ */
+static void parse_bsd(struct parsed_partitions *state,
+		      sector_t offset, sector_t size, int origin, char *flavour,
+		      int max_partitions)
+{
+	Sector sect;
+	struct bsd_disklabel *l;
+	struct bsd_partition *p;
+
+	l = read_part_sector(state, offset + 1, &sect);
+	if (!l)
+		return;
+	if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
+		put_dev_sector(sect);
+		return;
+	}
+
+	seq_buf_printf(&state->pp_buf, " %s%d: <%s:", state->name, origin, flavour);
+
+	if (le16_to_cpu(l->d_npartitions) < max_partitions)
+		max_partitions = le16_to_cpu(l->d_npartitions);
+	for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
+		sector_t bsd_start, bsd_size;
+
+		if (state->next == state->limit)
+			break;
+		if (p->p_fstype == BSD_FS_UNUSED)
+			continue;
+		bsd_start = le32_to_cpu(p->p_offset);
+		bsd_size = le32_to_cpu(p->p_size);
+		/* FreeBSD has relative offset if C partition offset is zero */
+		if (memcmp(flavour, "bsd\0", 4) == 0 &&
+		    le32_to_cpu(l->d_partitions[2].p_offset) == 0)
+			bsd_start += offset;
+		if (offset == bsd_start && size == bsd_size)
+			/* full parent partition, we have it already */
+			continue;
+		if (offset > bsd_start || offset+size < bsd_start+bsd_size) {
+			seq_buf_puts(&state->pp_buf, "bad subpartition - ignored\n");
+			continue;
+		}
+		put_partition(state, state->next++, bsd_start, bsd_size);
+	}
+	put_dev_sector(sect);
+	if (le16_to_cpu(l->d_npartitions) > max_partitions)
+		seq_buf_printf(&state->pp_buf, " (ignored %d more)",
+			       le16_to_cpu(l->d_npartitions) - max_partitions);
+	seq_buf_puts(&state->pp_buf, " >\n");
+}
+#endif
+
+static void parse_freebsd(struct parsed_partitions *state,
+			  sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_BSD_DISKLABEL
+	parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS);
+#endif
+}
+
+static void parse_netbsd(struct parsed_partitions *state,
+			 sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_BSD_DISKLABEL
+	parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS);
+#endif
+}
+
+static void parse_openbsd(struct parsed_partitions *state,
+			  sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_BSD_DISKLABEL
+	parse_bsd(state, offset, size, origin, "openbsd",
+		  OPENBSD_MAXPARTITIONS);
+#endif
+}
+
+#define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)	/* The disk magic number */
+#define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)	/* The slice table magic nr */
+#define UNIXWARE_NUMSLICE      16
+#define UNIXWARE_FS_UNUSED     0		/* Unused slice entry ID */
+
+struct unixware_slice {
+	__le16   s_label;	/* label */
+	__le16   s_flags;	/* permission flags */
+	__le32   start_sect;	/* starting sector */
+	__le32   nr_sects;	/* number of sectors in slice */
+};
+
+struct unixware_disklabel {
+	__le32	d_type;			/* drive type */
+	__le32	d_magic;		/* the magic number */
+	__le32	d_version;		/* version number */
+	char	d_serial[12];		/* serial number of the device */
+	__le32	d_ncylinders;		/* # of data cylinders per device */
+	__le32	d_ntracks;		/* # of tracks per cylinder */
+	__le32	d_nsectors;		/* # of data sectors per track */
+	__le32	d_secsize;		/* # of bytes per sector */
+	__le32	d_part_start;		/* # of first sector of this partition*/
+	__le32	d_unknown1[12];		/* ? */
+	__le32	d_alt_tbl;		/* byte offset of alternate table */
+	__le32	d_alt_len;		/* byte length of alternate table */
+	__le32	d_phys_cyl;		/* # of physical cylinders per device */
+	__le32	d_phys_trk;		/* # of physical tracks per cylinder */
+	__le32	d_phys_sec;		/* # of physical sectors per track */
+	__le32	d_phys_bytes;		/* # of physical bytes per sector */
+	__le32	d_unknown2;		/* ? */
+	__le32	d_unknown3;		/* ? */
+	__le32	d_pad[8];		/* pad */
+
+	struct unixware_vtoc {
+		__le32	v_magic;		/* the magic number */
+		__le32	v_version;		/* version number */
+		char	v_name[8];		/* volume name */
+		__le16	v_nslices;		/* # of slices */
+		__le16	v_unknown1;		/* ? */
+		__le32	v_reserved[10];		/* reserved */
+		struct unixware_slice
+			v_slice[UNIXWARE_NUMSLICE];	/* slice headers */
+	} vtoc;
+};  /* 408 */
+
+/*
+ * Create devices for Unixware partitions listed in a disklabel, under a
+ * dos-like partition. See parse_extended() for more information.
+ */
+static void parse_unixware(struct parsed_partitions *state,
+			   sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_UNIXWARE_DISKLABEL
+	Sector sect;
+	struct unixware_disklabel *l;
+	struct unixware_slice *p;
+
+	l = read_part_sector(state, offset + 29, &sect);
+	if (!l)
+		return;
+	if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC ||
+	    le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
+		put_dev_sector(sect);
+		return;
+	}
+	seq_buf_printf(&state->pp_buf, " %s%d: <unixware:", state->name, origin);
+	p = &l->vtoc.v_slice[1];
+	/* I omit the 0th slice as it is the same as whole disk. */
+	while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
+		if (state->next == state->limit)
+			break;
+
+		if (p->s_label != UNIXWARE_FS_UNUSED)
+			put_partition(state, state->next++,
+				      le32_to_cpu(p->start_sect),
+				      le32_to_cpu(p->nr_sects));
+		p++;
+	}
+	put_dev_sector(sect);
+	seq_buf_puts(&state->pp_buf, " >\n");
+#endif
+}
+
+#define MINIX_NR_SUBPARTITIONS  4
+
+/*
+ * Minix 2.0.0/2.0.2 subpartition support.
+ * Anand Krishnamurthy <anandk@wiproge.med.ge.com>
+ * Rajeev V. Pillai    <rajeevvp@yahoo.com>
+ */
+static void parse_minix(struct parsed_partitions *state,
+			sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_MINIX_SUBPARTITION
+	Sector sect;
+	unsigned char *data;
+	struct msdos_partition *p;
+	int i;
+
+	data = read_part_sector(state, offset, &sect);
+	if (!data)
+		return;
+
+	p = (struct msdos_partition *)(data + 0x1be);
+
+	/* The first sector of a Minix partition can have either
+	 * a secondary MBR describing its subpartitions, or
+	 * the normal boot sector. */
+	if (msdos_magic_present(data + 510) &&
+	    p->sys_ind == MINIX_PARTITION) { /* subpartition table present */
+		seq_buf_printf(&state->pp_buf, " %s%d: <minix:", state->name, origin);
+		for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
+			if (state->next == state->limit)
+				break;
+			/* add each partition in use */
+			if (p->sys_ind == MINIX_PARTITION)
+				put_partition(state, state->next++,
+					      start_sect(p), nr_sects(p));
+		}
+		seq_buf_puts(&state->pp_buf, " >\n");
+	}
+	put_dev_sector(sect);
+#endif /* CONFIG_MINIX_SUBPARTITION */
+}
+
+static struct {
+	unsigned char id;
+	void (*parse)(struct parsed_partitions *, sector_t, sector_t, int);
+} subtypes[] = {
+	{FREEBSD_PARTITION, parse_freebsd},
+	{NETBSD_PARTITION, parse_netbsd},
+	{OPENBSD_PARTITION, parse_openbsd},
+	{MINIX_PARTITION, parse_minix},
+	{UNIXWARE_PARTITION, parse_unixware},
+	{SOLARIS_X86_PARTITION, parse_solaris_x86},
+	{NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
+	{0, NULL},
+};
+
+int msdos_partition(struct parsed_partitions *state)
+{
+	sector_t sector_size;
+	Sector sect;
+	unsigned char *data;
+	struct msdos_partition *p;
+	struct fat_boot_sector *fb;
+	int slot;
+	u32 disksig;
+
+	sector_size = queue_logical_block_size(state->disk->queue) / 512;
+	data = read_part_sector(state, 0, &sect);
+	if (!data)
+		return -1;
+
+	/*
+	 * Note order! (some AIX disks, e.g. unbootable kind,
+	 * have no MSDOS 55aa)
+	 */
+	if (aix_magic_present(state, data)) {
+		put_dev_sector(sect);
+#ifdef CONFIG_AIX_PARTITION
+		return aix_partition(state);
+#else
+		seq_buf_puts(&state->pp_buf, " [AIX]");
+		return 0;
+#endif
+	}
+
+	if (!msdos_magic_present(data + 510)) {
+		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 msdos_partition *) (data + 0x1be);
+	for (slot = 1; slot <= 4; slot++, p++) {
+		if (p->boot_ind != 0 && p->boot_ind != 0x80) {
+			/*
+			 * Even without a valid boot indicator value
+			 * its still possible this is valid FAT filesystem
+			 * without a partition table.
+			 */
+			fb = (struct fat_boot_sector *) data;
+			if (slot == 1 && fb->reserved && fb->fats
+				&& fat_valid_media(fb->media)) {
+				seq_buf_puts(&state->pp_buf, "\n");
+				put_dev_sector(sect);
+				return 1;
+			} else {
+				put_dev_sector(sect);
+				return 0;
+			}
+		}
+	}
+
+#ifdef CONFIG_EFI_PARTITION
+	p = (struct msdos_partition *) (data + 0x1be);
+	for (slot = 1 ; slot <= 4 ; slot++, p++) {
+		/* If this is an EFI GPT disk, msdos should ignore it. */
+		if (p->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT) {
+			put_dev_sector(sect);
+			return 0;
+		}
+	}
+#endif
+	p = (struct msdos_partition *) (data + 0x1be);
+
+	disksig = le32_to_cpup((__le32 *)(data + 0x1b8));
+
+	/*
+	 * Look for partitions in two passes:
+	 * First find the primary and DOS-type extended partitions.
+	 * On the second pass look inside *BSD, Unixware and Solaris partitions.
+	 */
+
+	state->next = 5;
+	for (slot = 1 ; slot <= 4 ; slot++, p++) {
+		sector_t start = start_sect(p)*sector_size;
+		sector_t size = nr_sects(p)*sector_size;
+
+		if (!size)
+			continue;
+		if (is_extended_partition(p)) {
+			/*
+			 * prevent someone doing mkfs or mkswap on an
+			 * extended partition, but leave room for LILO
+			 * FIXME: this uses one logical sector for > 512b
+			 * sector, although it may not be enough/proper.
+			 */
+			sector_t n = 2;
+
+			n = min(size, max(sector_size, n));
+			put_partition(state, slot, start, n);
+
+			seq_buf_puts(&state->pp_buf, " <");
+			parse_extended(state, start, size, disksig);
+			seq_buf_puts(&state->pp_buf, " >");
+			continue;
+		}
+		put_partition(state, slot, start, size);
+		set_info(state, slot, disksig);
+		if (p->sys_ind == LINUX_RAID_PARTITION)
+			state->parts[slot].flags = ADDPART_FLAG_RAID;
+		if (p->sys_ind == DM6_PARTITION)
+			seq_buf_puts(&state->pp_buf, "[DM]");
+		if (p->sys_ind == EZD_PARTITION)
+			seq_buf_puts(&state->pp_buf, "[EZD]");
+	}
+
+	seq_buf_puts(&state->pp_buf, "\n");
+
+	/* second pass - output for each on a separate line */
+	p = (struct msdos_partition *) (0x1be + data);
+	for (slot = 1 ; slot <= 4 ; slot++, p++) {
+		unsigned char id = p->sys_ind;
+		int n;
+
+		if (!nr_sects(p))
+			continue;
+
+		for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
+			;
+
+		if (!subtypes[n].parse)
+			continue;
+		subtypes[n].parse(state, start_sect(p) * sector_size,
+				  nr_sects(p) * sector_size, slot);
+	}
+	put_dev_sector(sect);
+	return 1;
+}
diff --git a/block/partitions/of.c b/block/partitions/of.c
new file mode 100644
index 000000000..53664ea06
--- /dev/null
+++ b/block/partitions/of.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/blkdev.h>
+#include <linux/major.h>
+#include <linux/of.h>
+#include <linux/string.h>
+#include "check.h"
+
+static int validate_of_partition(struct device_node *np, int slot)
+{
+	u64 offset, size;
+	int len;
+
+	const __be32 *reg = of_get_property(np, "reg", &len);
+	int a_cells = of_n_addr_cells(np);
+	int s_cells = of_n_size_cells(np);
+
+	/* Make sure reg len match the expected addr and size cells */
+	if (len / sizeof(*reg) != a_cells + s_cells)
+		return -EINVAL;
+
+	/* Validate offset conversion from bytes to sectors */
+	offset = of_read_number(reg, a_cells);
+	if (offset % SECTOR_SIZE)
+		return -EINVAL;
+
+	/* Validate size conversion from bytes to sectors */
+	size = of_read_number(reg + a_cells, s_cells);
+	if (!size || size % SECTOR_SIZE)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void add_of_partition(struct parsed_partitions *state, int slot,
+			     struct device_node *np)
+{
+	struct partition_meta_info *info;
+	const char *partname;
+	int len;
+
+	const __be32 *reg = of_get_property(np, "reg", &len);
+	int a_cells = of_n_addr_cells(np);
+	int s_cells = of_n_size_cells(np);
+
+	/* Convert bytes to sector size */
+	u64 offset = of_read_number(reg, a_cells) / SECTOR_SIZE;
+	u64 size = of_read_number(reg + a_cells, s_cells) / SECTOR_SIZE;
+
+	put_partition(state, slot, offset, size);
+
+	if (of_property_read_bool(np, "read-only"))
+		state->parts[slot].flags |= ADDPART_FLAG_READONLY;
+
+	/*
+	 * Follow MTD label logic, search for label property,
+	 * fallback to node name if not found.
+	 */
+	info = &state->parts[slot].info;
+	partname = of_get_property(np, "label", &len);
+	if (!partname)
+		partname = of_get_property(np, "name", &len);
+	strscpy(info->volname, partname, sizeof(info->volname));
+
+	seq_buf_printf(&state->pp_buf, "(%s)", info->volname);
+}
+
+int of_partition(struct parsed_partitions *state)
+{
+	struct device *ddev = disk_to_dev(state->disk);
+	struct device_node *np;
+	int slot;
+
+	struct device_node *partitions_np = of_node_get(ddev->of_node);
+
+	if (!partitions_np ||
+	    !of_device_is_compatible(partitions_np, "fixed-partitions")) {
+		of_node_put(partitions_np);
+		return 0;
+	}
+
+	slot = 1;
+	/* Validate parition offset and size */
+	for_each_child_of_node(partitions_np, np) {
+		if (validate_of_partition(np, slot)) {
+			of_node_put(np);
+			of_node_put(partitions_np);
+
+			return -1;
+		}
+
+		slot++;
+	}
+
+	slot = 1;
+	for_each_child_of_node(partitions_np, np) {
+		if (slot >= state->limit) {
+			of_node_put(np);
+			break;
+		}
+
+		add_of_partition(state, slot, np);
+
+		slot++;
+	}
+
+	seq_buf_puts(&state->pp_buf, "\n");
+
+	of_node_put(partitions_np);
+	return 1;
+}
diff --git a/block/partitions/osf.c b/block/partitions/osf.c
new file mode 100644
index 000000000..2a692584d
--- /dev/null
+++ b/block/partitions/osf.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/osf.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include "check.h"
+
+#define MAX_OSF_PARTITIONS 18
+#define DISKLABELMAGIC (0x82564557UL)
+
+int osf_partition(struct parsed_partitions *state)
+{
+	int i;
+	int slot = 1;
+	unsigned int npartitions;
+	Sector sect;
+	unsigned char *data;
+	struct disklabel {
+		__le32 d_magic;
+		__le16 d_type,d_subtype;
+		u8 d_typename[16];
+		u8 d_packname[16];
+		__le32 d_secsize;
+		__le32 d_nsectors;
+		__le32 d_ntracks;
+		__le32 d_ncylinders;
+		__le32 d_secpercyl;
+		__le32 d_secprtunit;
+		__le16 d_sparespertrack;
+		__le16 d_sparespercyl;
+		__le32 d_acylinders;
+		__le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
+		__le32 d_headswitch, d_trkseek, d_flags;
+		__le32 d_drivedata[5];
+		__le32 d_spare[5];
+		__le32 d_magic2;
+		__le16 d_checksum;
+		__le16 d_npartitions;
+		__le32 d_bbsize, d_sbsize;
+		struct d_partition {
+			__le32 p_size;
+			__le32 p_offset;
+			__le32 p_fsize;
+			u8  p_fstype;
+			u8  p_frag;
+			__le16 p_cpg;
+		} d_partitions[MAX_OSF_PARTITIONS];
+	} * label;
+	struct d_partition * partition;
+
+	data = read_part_sector(state, 0, &sect);
+	if (!data)
+		return -1;
+
+	label = (struct disklabel *) (data+64);
+	partition = label->d_partitions;
+	if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	npartitions = le16_to_cpu(label->d_npartitions);
+	if (npartitions > MAX_OSF_PARTITIONS) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	for (i = 0 ; i < npartitions; i++, partition++) {
+		if (slot == state->limit)
+		        break;
+		if (le32_to_cpu(partition->p_size))
+			put_partition(state, slot,
+				le32_to_cpu(partition->p_offset),
+				le32_to_cpu(partition->p_size));
+		slot++;
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+	put_dev_sector(sect);
+	return 1;
+}
diff --git a/block/partitions/sgi.c b/block/partitions/sgi.c
new file mode 100644
index 000000000..2383ca63c
--- /dev/null
+++ b/block/partitions/sgi.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/sgi.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ */
+
+#include "check.h"
+
+#define SGI_LABEL_MAGIC 0x0be5a941
+
+enum {
+	LINUX_RAID_PARTITION = 0xfd,	/* autodetect RAID partition */
+};
+
+struct sgi_disklabel {
+	__be32 magic_mushroom;		/* Big fat spliff... */
+	__be16 root_part_num;		/* Root partition number */
+	__be16 swap_part_num;		/* Swap partition number */
+	s8 boot_file[16];		/* Name of boot file for ARCS */
+	u8 _unused0[48];		/* Device parameter useless crapola.. */
+	struct sgi_volume {
+		s8 name[8];		/* Name of volume */
+		__be32 block_num;		/* Logical block number */
+		__be32 num_bytes;		/* How big, in bytes */
+	} volume[15];
+	struct sgi_partition {
+		__be32 num_blocks;		/* Size in logical blocks */
+		__be32 first_block;	/* First logical block */
+		__be32 type;		/* Type of this partition */
+	} partitions[16];
+	__be32 csum;			/* Disk label checksum */
+	__be32 _unused1;			/* Padding */
+};
+
+int sgi_partition(struct parsed_partitions *state)
+{
+	int i, csum;
+	__be32 magic;
+	int slot = 1;
+	unsigned int start, blocks;
+	__be32 *ui, cs;
+	Sector sect;
+	struct sgi_disklabel *label;
+	struct sgi_partition *p;
+
+	label = read_part_sector(state, 0, &sect);
+	if (!label)
+		return -1;
+	p = &label->partitions[0];
+	magic = label->magic_mushroom;
+	if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	ui = ((__be32 *) (label + 1)) - 1;
+	for(csum = 0; ui >= ((__be32 *) label);) {
+		cs = *ui--;
+		csum += be32_to_cpu(cs);
+	}
+	if(csum) {
+		printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
+		       state->disk->disk_name);
+		put_dev_sector(sect);
+		return 0;
+	}
+	/* All SGI disk labels have 16 partitions, disks under Linux only
+	 * have 15 minor's.  Luckily there are always a few zero length
+	 * partitions which we don't care about so we never overflow the
+	 * current_minor.
+	 */
+	for(i = 0; i < 16; i++, p++) {
+		blocks = be32_to_cpu(p->num_blocks);
+		start  = be32_to_cpu(p->first_block);
+		if (blocks) {
+			put_partition(state, slot, start, blocks);
+			if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
+				state->parts[slot].flags = ADDPART_FLAG_RAID;
+		}
+		slot++;
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+	put_dev_sector(sect);
+	return 1;
+}
diff --git a/block/partitions/sun.c b/block/partitions/sun.c
new file mode 100644
index 000000000..92c645fcd
--- /dev/null
+++ b/block/partitions/sun.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/sun.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include "check.h"
+
+#define SUN_LABEL_MAGIC          0xDABE
+#define SUN_VTOC_SANITY          0x600DDEEE
+
+enum {
+	SUN_WHOLE_DISK = 5,
+	LINUX_RAID_PARTITION = 0xfd,	/* autodetect RAID partition */
+};
+
+int sun_partition(struct parsed_partitions *state)
+{
+	int i;
+	__be16 csum;
+	int slot = 1;
+	__be16 *ush;
+	Sector sect;
+	struct sun_disklabel {
+		unsigned char info[128];   /* Informative text string */
+		struct sun_vtoc {
+		    __be32 version;     /* Layout version */
+		    char   volume[8];   /* Volume name */
+		    __be16 nparts;      /* Number of partitions */
+		    struct sun_info {           /* Partition hdrs, sec 2 */
+			__be16 id;
+			__be16 flags;
+		    } infos[8];
+		    __be16 padding;     /* Alignment padding */
+		    __be32 bootinfo[3];  /* Info needed by mboot */
+		    __be32 sanity;       /* To verify vtoc sanity */
+		    __be32 reserved[10]; /* Free space */
+		    __be32 timestamp[8]; /* Partition timestamp */
+		} vtoc;
+		__be32 write_reinstruct; /* sectors to skip, writes */
+		__be32 read_reinstruct;  /* sectors to skip, reads */
+		unsigned char spare[148]; /* Padding */
+		__be16 rspeed;     /* Disk rotational speed */
+		__be16 pcylcount;  /* Physical cylinder count */
+		__be16 sparecyl;   /* extra sects per cylinder */
+		__be16 obs1;       /* gap1 */
+		__be16 obs2;       /* gap2 */
+		__be16 ilfact;     /* Interleave factor */
+		__be16 ncyl;       /* Data cylinder count */
+		__be16 nacyl;      /* Alt. cylinder count */
+		__be16 ntrks;      /* Tracks per cylinder */
+		__be16 nsect;      /* Sectors per track */
+		__be16 obs3;       /* bhead - Label head offset */
+		__be16 obs4;       /* ppart - Physical Partition */
+		struct sun_partition {
+			__be32 start_cylinder;
+			__be32 num_sectors;
+		} partitions[8];
+		__be16 magic;      /* Magic number */
+		__be16 csum;       /* Label xor'd checksum */
+	} * label;
+	struct sun_partition *p;
+	unsigned long spc;
+	int use_vtoc;
+	int nparts;
+
+	label = read_part_sector(state, 0, &sect);
+	if (!label)
+		return -1;
+
+	p = label->partitions;
+	if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	/* Look at the checksum */
+	ush = ((__be16 *) (label+1)) - 1;
+	for (csum = 0; ush >= ((__be16 *) label);)
+		csum ^= *ush--;
+	if (csum) {
+		printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
+		       state->disk->disk_name);
+		put_dev_sector(sect);
+		return 0;
+	}
+
+	/* Check to see if we can use the VTOC table */
+	use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
+		    (be32_to_cpu(label->vtoc.version) == 1) &&
+		    (be16_to_cpu(label->vtoc.nparts) <= 8));
+
+	/* Use 8 partition entries if not specified in validated VTOC */
+	nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
+
+	/*
+	 * So that old Linux-Sun partitions continue to work,
+	 * alow the VTOC to be used under the additional condition ...
+	 */
+	use_vtoc = use_vtoc || !(label->vtoc.sanity ||
+				 label->vtoc.version || label->vtoc.nparts);
+	spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
+	for (i = 0; i < nparts; i++, p++) {
+		unsigned long st_sector;
+		unsigned int num_sectors;
+
+		st_sector = be32_to_cpu(p->start_cylinder) * spc;
+		num_sectors = be32_to_cpu(p->num_sectors);
+		if (num_sectors) {
+			put_partition(state, slot, st_sector, num_sectors);
+			state->parts[slot].flags = 0;
+			if (use_vtoc) {
+				if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
+					state->parts[slot].flags |= ADDPART_FLAG_RAID;
+				else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
+					state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
+			}
+		}
+		slot++;
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+	put_dev_sector(sect);
+	return 1;
+}
diff --git a/block/partitions/sysv68.c b/block/partitions/sysv68.c
new file mode 100644
index 000000000..470e0f9de
--- /dev/null
+++ b/block/partitions/sysv68.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/sysv68.c
+ *
+ *  Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
+ */
+
+#include "check.h"
+
+/*
+ *	Volume ID structure: on first 256-bytes sector of disk
+ */
+
+struct volumeid {
+	u8	vid_unused[248];
+	u8	vid_mac[8];	/* ASCII string "MOTOROLA" */
+};
+
+/*
+ *	config block: second 256-bytes sector on disk
+ */
+
+struct dkconfig {
+	u8	ios_unused0[128];
+	__be32	ios_slcblk;	/* Slice table block number */
+	__be16	ios_slccnt;	/* Number of entries in slice table */
+	u8	ios_unused1[122];
+};
+
+/*
+ *	combined volumeid and dkconfig block
+ */
+
+struct dkblk0 {
+	struct volumeid dk_vid;
+	struct dkconfig dk_ios;
+};
+
+/*
+ *	Slice Table Structure
+ */
+
+struct slice {
+	__be32	nblocks;		/* slice size (in blocks) */
+	__be32	blkoff;			/* block offset of slice */
+};
+
+
+int sysv68_partition(struct parsed_partitions *state)
+{
+	int i, slices;
+	int slot = 1;
+	Sector sect;
+	unsigned char *data;
+	struct dkblk0 *b;
+	struct slice *slice;
+
+	data = read_part_sector(state, 0, &sect);
+	if (!data)
+		return -1;
+
+	b = (struct dkblk0 *)data;
+	if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
+		put_dev_sector(sect);
+		return 0;
+	}
+	slices = be16_to_cpu(b->dk_ios.ios_slccnt);
+	i = be32_to_cpu(b->dk_ios.ios_slcblk);
+	put_dev_sector(sect);
+
+	data = read_part_sector(state, i, &sect);
+	if (!data)
+		return -1;
+
+	slices -= 1; /* last slice is the whole disk */
+	seq_buf_printf(&state->pp_buf, "sysV68: %s(s%u)", state->name, slices);
+	slice = (struct slice *)data;
+	for (i = 0; i < slices; i++, slice++) {
+		if (slot == state->limit)
+			break;
+		if (be32_to_cpu(slice->nblocks)) {
+			put_partition(state, slot,
+				be32_to_cpu(slice->blkoff),
+				be32_to_cpu(slice->nblocks));
+			seq_buf_printf(&state->pp_buf, "(s%u)", i);
+		}
+		slot++;
+	}
+	seq_buf_puts(&state->pp_buf, "\n");
+	put_dev_sector(sect);
+	return 1;
+}
diff --git a/block/partitions/ultrix.c b/block/partitions/ultrix.c
new file mode 100644
index 000000000..b4b9ddc57
--- /dev/null
+++ b/block/partitions/ultrix.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/ultrix.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Re-organised Jul 1999 Russell King
+ */
+
+#include "check.h"
+
+int ultrix_partition(struct parsed_partitions *state)
+{
+	int i;
+	Sector sect;
+	unsigned char *data;
+	struct ultrix_disklabel {
+		s32	pt_magic;	/* magic no. indicating part. info exits */
+		s32	pt_valid;	/* set by driver if pt is current */
+		struct  pt_info {
+			s32		pi_nblocks; /* no. of sectors */
+			u32		pi_blkoff;  /* block offset for start */
+		} pt_part[8];
+	} *label;
+
+#define PT_MAGIC	0x032957	/* Partition magic number */
+#define PT_VALID	1		/* Indicates if struct is valid */
+
+	data = read_part_sector(state, (16384 - sizeof(*label))/512, &sect);
+	if (!data)
+		return -1;
+	
+	label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));
+
+	if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {
+		for (i=0; i<8; i++)
+			if (label->pt_part[i].pi_nblocks)
+				put_partition(state, i+1, 
+					      label->pt_part[i].pi_blkoff,
+					      label->pt_part[i].pi_nblocks);
+		put_dev_sector(sect);
+		seq_buf_puts(&state->pp_buf, "\n");
+		return 1;
+	} else {
+		put_dev_sector(sect);
+		return 0;
+	}
+}