LDM: Fix for Windows Vista dynamic disks

This fixes the LDM driver so that it works with Windows Vista dynamic
disks which are subtly different to Windows 2000/XP ones.

The patch was needed to get a Vista formatted dynamic disk to be
recognized and parsed successfully.

Thanks go to Chris Teachworth for the report and testing.

Cc: Richard Russon <ldm@flatcap.org>
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/ldm.txt

@@ -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

@@ -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

@@ -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.h

@@ -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. */