LDM: Fix for Windows Vista dynamic disks (dde33348) · Commits · e / devices / android_kernel_sony_msm8994

Documentation/ldm.txt

+14 −7

Original line number	Diff line number	Diff line
		@@ -2,10 +2,13 @@
		LDM - Logical Disk Manager (Dynamic Disks)
		------------------------------------------

		Originally Written by FlatCap - Richard Russon <ldm@flatcap.org>.
		Last Updated by Anton Altaparmakov on 30 March 2007 for Windows Vista.

		Overview
		--------

		Windows 2000 and XP use a new partitioning scheme. It is a complete
		Windows 2000, XP, and Vista use a new partitioning scheme. It is a complete
		replacement for the MSDOS style partitions. It stores its information in a
		1MiB journalled database at the end of the physical disk. The size of
		partitions is limited only by disk space. The maximum number of partitions is
		@@ -23,7 +26,11 @@ Once the LDM driver has divided up the disk, you can use the MD driver to
		assemble any multi-partition volumes, e.g. Stripes, RAID5.

		To prevent legacy applications from repartitioning the disk, the LDM creates a
		dummy MSDOS partition containing one disk-sized partition.
		dummy MSDOS partition containing one disk-sized partition. This is what is
		supported with the Linux LDM driver.

		A newer approach that has been implemented with Vista is to put LDM on top of a
		GPT label disk. This is not supported by the Linux LDM driver yet.


		Example
		@@ -88,13 +95,13 @@ and cannot boot from a Dynamic Disk.
		More Documentation
		------------------

		There is an Overview of the LDM online together with complete Technical
		Documentation. It can also be downloaded in html.
		There is an Overview of the LDM together with complete Technical Documentation.
		It is available for download.

		http://linux-ntfs.sourceforge.net/ldm/index.html
		http://linux-ntfs.sourceforge.net/downloads.html
		http://www.linux-ntfs.org/content/view/19/37/

		If you have any LDM questions that aren't answered on the website, email me.
		If you have any LDM questions that aren't answered in the documentation, email
		me.

		Cheers,
		FlatCap - Richard Russon

MAINTAINERS

+3 −3

Original line number	Diff line number	Diff line
		@@ -2231,11 +2231,11 @@ M: khali@linux-fr.org
		L: lm-sensors@lm-sensors.org
		S: Maintained

		LOGICAL DISK MANAGER SUPPORT (LDM, Windows 2000/XP Dynamic Disks)
		LOGICAL DISK MANAGER SUPPORT (LDM, Windows 2000/XP/Vista Dynamic Disks)
		P: Richard Russon (FlatCap)
		M: ldm@flatcap.org
		L: ldm-devel@lists.sourceforge.net
		W: http://ldm.sourceforge.net
		L: linux-ntfs-dev@lists.sourceforge.net
		W: http://www.linux-ntfs.org/content/view/19/37/
		S: Maintained

		LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)

fs/partitions/Kconfig

+8 −4

Original line number	Diff line number	Diff line
		@@ -166,8 +166,12 @@ config LDM_PARTITION
		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 or XP's Logical Disk Manager.
		They are also known as "Dynamic Disks".
		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
		@@ -175,8 +179,8 @@ config LDM_PARTITION
		mirrored, striped or RAID volumes, all without the need for
		rebooting.

		Normal partitions are now called Basic Disks under Windows 2000 and
		XP.
		Normal partitions are now called Basic Disks under Windows 2000, XP,
		and Vista.

		For a fuller description read <file:Documentation/ldm.txt>.

fs/partitions/ldm.c

+116 −90

Original line number	Diff line number	Diff line
		@@ -2,10 +2,10 @@
		* ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
		*
		* Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
		* Copyright (c) 2001-2004 Anton Altaparmakov
		* Copyright (c) 2001-2007 Anton Altaparmakov
		* Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
		*
		* Documentation is available at http://linux-ntfs.sf.net/ldm
		* Documentation is available at http://www.linux-ntfs.org/content/view/19/37/
		*
		* This program is free software; you can redistribute it and/or modify it under
		* the terms of the GNU General Public License as published by the Free Software
		@@ -62,7 +62,6 @@ static void _ldm_printk (const char level, const char function,
		printk ("%s%s(): %s\n", level, function, buf);
		}


		/**
		* ldm_parse_hexbyte - Convert a ASCII hex number to a byte
		* @src: Pointer to at least 2 characters to convert.
		@@ -118,7 +117,6 @@ static bool ldm_parse_guid (const u8 src, u8 dest)
		return true;
		}


		/**
		* ldm_parse_privhead - Read the LDM Database PRIVHEAD structure
		* @data: Raw database PRIVHEAD structure loaded from the device
		@@ -132,43 +130,45 @@ static bool ldm_parse_guid (const u8 src, u8 dest)
		*/
		static bool ldm_parse_privhead(const u8 data, struct privhead ph)
		{
		BUG_ON (!data \|\| !ph);
		bool is_vista = false;

		BUG_ON(!data \|\| !ph);
		if (MAGIC_PRIVHEAD != BE64(data)) {
		ldm_error("Cannot find PRIVHEAD structure. LDM database is"
		" corrupt. Aborting.");
		return false;
		}

		ph->ver_major = BE16(data + 0x000C);
		ph->ver_minor = BE16(data + 0x000E);
		ph->logical_disk_start = BE64(data + 0x011B);
		ph->logical_disk_size = BE64(data + 0x0123);
		ph->config_start = BE64(data + 0x012B);
		ph->config_size = BE64(data + 0x0133);

		if ((ph->ver_major != 2) \|\| (ph->ver_minor != 11)) {
		ldm_error ("Expected PRIVHEAD version %d.%d, got %d.%d."
		" Aborting.", 2, 11, ph->ver_major, ph->ver_minor);
		/* 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 */
		/* 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 );
		udunsigned long long)ph->config_size);
		}
		if ((ph->logical_disk_size == 0) \|\|
		(ph->logical_disk_start + ph->logical_disk_size > ph->config_start)) {
		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 (!ldm_parse_guid(data + 0x0030, ph->disk_id)) {
		ldm_error("PRIVHEAD contains an invalid GUID.");
		return false;
		}

		ldm_debug("Parsed PRIVHEAD successfully.");
		return true;
		}
		@@ -417,54 +417,57 @@ static bool ldm_validate_tocblocks (struct block_device *bdev,
		struct privhead *ph;
		Sector sect;
		u8 *data;
		int i, nr_tbs;
		bool result = false;
		int i;

		BUG_ON(!bdev \|\| !ldb);

		ph = &ldb->ph;
		tb[0] = &ldb->toc;
		tb[1] = kmalloc (sizeof (*tb[1]), GFP_KERNEL);
		tb[2] = kmalloc (sizeof (*tb[2]), GFP_KERNEL);
		tb[3] = kmalloc (sizeof (*tb[3]), GFP_KERNEL);
		if (!tb[1] \|\| !tb[2] \|\| !tb[3]) {
		tb[1] = kmalloc(sizeof(tb[1]) 3, GFP_KERNEL);
		if (!tb[1]) {
		ldm_crit("Out of memory.");
		goto out;
		goto err;
		}

		for (i = 0; i < 4; i++) /* Read and parse all four toc's. */
		{
		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_dev_sector(bdev, base + off[i], &sect);
		if (!data) {
		ldm_crit ("Disk read failed.");
		goto out;
		ldm_error("Disk read failed for TOCBLOCK %d.", i);
		continue;
		}
		result = ldm_parse_tocblock (data, tb[i]);
		if (ldm_parse_tocblock(data, tb[nr_tbs]))
		nr_tbs++;
		put_dev_sector(sect);
		if (!result)
		goto out; /* Already logged */
		}

		/* Range check the toc against a privhead. */
		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)) {
		((tb[0]->bitmap2_start + tb[0]->bitmap2_size) >
		ph->config_size)) {
		ldm_crit("The bitmaps are out of range. Giving up.");
		goto out;
		goto err;
		}

		if (!ldm_compare_tocblocks (tb[0], tb[1]) \|\| /* Compare all tocs. */
		!ldm_compare_tocblocks (tb[0], tb[2]) \|\|
		!ldm_compare_tocblocks (tb[0], tb[3])) {
		ldm_crit ("The TOCBLOCKs don't match.");
		goto out;
		/* 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 TOCBLOCKs successfully.");
		}
		ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs);
		result = true;
		out:
		err:
		kfree(tb[1]);
		kfree (tb[2]);
		kfree (tb[3]);
		return result;
		}

		@@ -566,7 +569,7 @@ static bool ldm_validate_partition_table (struct block_device *bdev)

		p = (struct partition*)(data + 0x01BE);
		for (i = 0; i < 4; i++, p++)
		if (SYS_IND (p) == WIN2K_DYNAMIC_PARTITION) {
		if (SYS_IND (p) == LDM_PARTITION) {
		result = true;
		break;
		}
		@@ -981,27 +984,52 @@ static bool ldm_parse_prt3 (const u8 buffer, int buflen, struct vblk vb)
		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 {
		r_index = 0;
		len = r_diskid;
		}
		if (len < 0)
		if (len < 0) {
		ldm_error("len %d < 0", len);
		return false;

		}
		len += VBLK_SIZE_PRT3;
		if (len != BE32 (buffer + 0x14))
		if (len > BE32(buffer + 0x14)) {
		ldm_error("len %d > BE32(buffer + 0x14) %d", len,
		BE32(buffer + 0x14));
		return false;

		}
		part = &vb->vblk.part;
		part->start = BE64(buffer + 0x24 + r_name);
		part->volume_offset = BE64(buffer + 0x2C + r_name);
		@@ -1012,7 +1040,6 @@ static bool ldm_parse_prt3 (const u8 buffer, int buflen, struct vblk vb)
		part->partnum = buffer[0x35 + r_diskid];
		else
		part->partnum = 0;

		return true;
		}

		@@ -1475,4 +1502,3 @@ out:
		kfree (ldb);
		return result;
		}

fs/partitions/ldm.h

+3 −3

Original line number	Diff line number	Diff line
		@@ -2,10 +2,10 @@
		* ldm - Part of the Linux-NTFS project.
		*
		* Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
		* Copyright (C) 2001 Anton Altaparmakov <aia21@cantab.net>
		* Copyright (c) 2001-2007 Anton Altaparmakov
		* Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
		*
		* Documentation is available at http://linux-ntfs.sf.net/ldm
		* Documentation is available at http://www.linux-ntfs.org/content/view/19/37/
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License as published by the Free
		@@ -93,7 +93,7 @@ struct parsed_partitions;

		#define OFF_VMDB 17 /* List of partitions. */

		#define WIN2K_DYNAMIC_PARTITION 0x42 /* Formerly SFS (Landis). */
		#define LDM_PARTITION 0x42 /* Formerly SFS (Landis). */

		#define TOC_BITMAP1 "config" /* Names of the two defined */
		#define TOC_BITMAP2 "log" /* bitmaps in the TOCBLOCK. */