Made KPartition abstract and derived two classes, KPhysicalPartition

and KShadowPartition from it. KPhysicalPartition represents a partition
that exists on-disk, while KShadowPartition is a partition edited by the
API user, but not yet written to disk. Related changes in other classes.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3851 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/disk_device_manager/KDiskDevice.h

@@ -5,7 +5,7 @@
 
 #include <OS.h>
 
-#include "KPartition.h"
+#include "KPhysicalPartition.h"
 #include "RWLocker.h"
 
 // disk device flags
@@ -18,7 +18,7 @@ enum {
 namespace BPrivate {
 namespace DiskDevice {
 
-class KDiskDevice : public KPartition {
+class KDiskDevice : public KPhysicalPartition {
 public:
 	KDiskDevice(partition_id id = -1);
 	virtual ~KDiskDevice();
@@ -66,8 +66,6 @@ public:
 	disk_device_data *DeviceData();
 	const disk_device_data *DeviceData() const;
 
-	virtual KPartition *CreateShadowPartition();
-
 	void SetShadowOwner(team_id team);
 	team_id ShadowOwner() const;
 

headers/private/kernel/disk_device_manager/KDiskDeviceManager.h

@@ -37,20 +37,18 @@ public:
 	// Disk Device / Partition Management
 
 	// manager must be locked
-	KDiskDevice *FindDevice(const char *path, bool noShadow = true);
-	KDiskDevice *FindDevice(partition_id id, bool noShadow = true);
-	KPartition *FindPartition(const char *path, bool noShadow = true);
-	KPartition *FindPartition(partition_id id, bool noShadow = true);
-	KFileDiskDevice *FindFileDevice(const char *filePath,
-									bool noShadow = true);
+	KDiskDevice *FindDevice(const char *path);
+	KDiskDevice *FindDevice(partition_id id);
+	KPartition *FindPartition(const char *path, bool noShadow = false);
+	KPartition *FindPartition(partition_id id, bool noShadow = false);
+	KFileDiskDevice *FindFileDevice(const char *filePath);
 
-	KDiskDevice *RegisterDevice(const char *path, bool noShadow = true);
-	KDiskDevice *RegisterDevice(partition_id id, bool noShadow = true);
+	KDiskDevice *RegisterDevice(const char *path);
+	KDiskDevice *RegisterDevice(partition_id id);
 	KDiskDevice *RegisterNextDevice(int32 *cookie);
-	KPartition *RegisterPartition(const char *path, bool noShadow = true);
-	KPartition *RegisterPartition(partition_id id, bool noShadow = true);
-	KFileDiskDevice *RegisterFileDevice(const char *filePath,
-										bool noShadow = true);
+	KPartition *RegisterPartition(const char *path, bool noShadow = false);
+	KPartition *RegisterPartition(partition_id id, bool noShadow = false);
+	KFileDiskDevice *RegisterFileDevice(const char *filePath);
 
 	status_t CreateFileDevice(const char *filePath, partition_id *device = 0);
 	status_t DeleteFileDevice(const char *filePath);

headers/private/kernel/disk_device_manager/KFileDiskDevice.h

@@ -22,8 +22,6 @@ public:
 
 	const char *FilePath() const;
 
-	virtual KPartition *CreateShadowPartition();
-
 //	virtual void Dump(bool deep = true, int32 level = 0);
 
 private:

headers/private/kernel/disk_device_manager/KPartition.h

@@ -24,6 +24,8 @@ namespace DiskDevice {
 
 class KDiskDevice;
 class KDiskSystem;
+class KPhysicalPartition;
+class KShadowPartition;
 
 class KPartition {
 public:
@@ -44,7 +46,7 @@ public:
 	virtual bool PrepareForRemoval();
 	virtual bool PrepareForDeletion();
 
-	status_t Open(int flags, int *fd);
+	virtual status_t Open(int flags, int *fd);
 	virtual status_t PublishDevice();
 	virtual status_t UnpublishDevice();
 
@@ -55,7 +57,7 @@ public:
 	bool IsDescendantBusy() const;
 		// == jobs which may affect a descendant of this partition are
 		// scheduled/in progress; IsBusy() => IsDescendantBusy()
-		// In the userland API, both can probably mapped to one flag.
+		// In the userland API, both can probably be mapped to one flag.
 
 	void SetOffset(off_t offset);
 	off_t Offset() const;		// 0 for devices
@@ -108,8 +110,8 @@ public:
 	void SetVolumeID(dev_t volumeID);
 	dev_t VolumeID() const;
 
-	status_t Mount(uint32 mountFlags, const char *parameters);
-	status_t Unmount();
+	virtual status_t Mount(uint32 mountFlags, const char *parameters);
+	virtual status_t Unmount();
 
 	// Parameters
 
@@ -128,8 +130,8 @@ public:
 	KPartition *Parent() const;
 
 	status_t AddChild(KPartition *partition, int32 index = -1);
-	status_t CreateChild(partition_id id, int32 index,
-						 KPartition **child = NULL);
+	virtual status_t CreateChild(partition_id id, int32 index,
+								 KPartition **child = NULL) = 0;
 	bool RemoveChild(int32 index);
 	bool RemoveChild(KPartition *child);
 	bool RemoveAllChildren();
@@ -138,10 +140,11 @@ public:
 
 	// Shadow Partition
 
-	virtual KPartition *CreateShadowPartition();	// creates a complete tree
-	void DeleteShadowPartition();					// deletes ...
-	KPartition *ShadowPartition() const;
-	bool IsShadowPartition() const;
+	virtual status_t CreateShadowPartition();	// creates a complete tree
+	virtual void DeleteShadowPartition();		// deletes ...
+	virtual KShadowPartition *ShadowPartition() = 0;
+	virtual bool IsShadowPartition() const = 0;
+	virtual KPhysicalPartition *PhysicalPartition() = 0;
 
 	// DiskSystem
 

headers/private/kernel/disk_device_manager/KPhysicalPartition.h

@@ -0,0 +1,55 @@
+// KPartition.h
+
+#ifndef _K_DISK_DEVICE_PHYSICAL_PARTITION_H
+#define _K_DISK_DEVICE_PHYSICAL_PARTITION_H
+
+#include <KPartition.h>
+
+namespace BPrivate {
+namespace DiskDevice {
+
+class KDiskDevice;
+class KDiskSystem;
+class KShadowPartition;
+
+class KPhysicalPartition : public KPartition {
+public:
+	KPhysicalPartition(partition_id id = -1);
+	virtual ~KPhysicalPartition();
+
+	virtual bool PrepareForRemoval();
+
+	virtual status_t Open(int flags, int *fd);
+	virtual status_t PublishDevice();
+	virtual status_t UnpublishDevice();
+
+	virtual status_t Mount(uint32 mountFlags, const char *parameters);
+	virtual status_t Unmount();
+
+	// Hierarchy
+
+	virtual status_t CreateChild(partition_id id, int32 index,
+								 KPartition **child = NULL);
+
+	// Shadow Partition
+
+	virtual status_t CreateShadowPartition();	// creates a complete tree
+	virtual void DeleteShadowPartition();		// deletes ...
+	virtual KShadowPartition *ShadowPartition();
+	virtual bool IsShadowPartition() const;
+	virtual KPhysicalPartition *PhysicalPartition();
+
+	// DiskSystem
+
+	virtual void Dump(bool deep, int32 level);
+
+protected:
+	KShadowPartition	*fShadowPartition;
+};
+
+} // namespace DiskDevice
+} // namespace BPrivate
+
+using BPrivate::DiskDevice::KPhysicalPartition;
+
+#endif	// _K_DISK_DEVICE_PHYSICAL_PARTITION_H

headers/private/kernel/disk_device_manager/KShadowPartition.h

@@ -0,0 +1,41 @@
+// KPartition.h
+
+#ifndef _K_DISK_DEVICE_SHADOW_PARTITION_H
+#define _K_DISK_DEVICE_SHADOW_PARTITION_H
+
+#include "KPartition.h"
+
+namespace BPrivate {
+namespace DiskDevice {
+
+class KPhysicalPartition;
+
+class KShadowPartition : public KPartition {
+public:
+	KShadowPartition(KPhysicalPartition *physicalPartition);
+	virtual ~KShadowPartition();
+
+	// Hierarchy
+
+	virtual status_t CreateChild(partition_id id, int32 index,
+								 KPartition **child = NULL);
+
+	// Shadow Partition
+
+	virtual KShadowPartition *ShadowPartition();
+	virtual bool IsShadowPartition() const;
+	void SetPhysicalPartition(KPhysicalPartition *partition);
+	virtual KPhysicalPartition *PhysicalPartition();
+
+	virtual void Dump(bool deep, int32 level);
+
+protected:
+	KPhysicalPartition	*fPhysicalPartition;
+};
+
+} // namespace DiskDevice
+} // namespace BPrivate
+
+using BPrivate::DiskDevice::KShadowPartition;
+
+#endif	// _K_DISK_DEVICE_SHADOW_PARTITION_H

src/kernel/core/disk_device_manager/Jamfile

@@ -11,6 +11,7 @@ UsePrivateHeaders [ FDirName storage ] ;
 UseHeaders [ FDirName $(OBOS_TOP) src tests kits storage virtualdrive ] ;
 
 SharedLibrary disk_device_manager :
+	disk_device_manager.cpp
 	KDiskDevice.cpp
 	KDiskDeviceJob.cpp
 	KDiskDeviceJobFactory.cpp
@@ -21,7 +22,8 @@ SharedLibrary disk_device_manager :
 	KFileSystem.cpp
 	KPartition.cpp
 	KPartitioningSystem.cpp
-	disk_device_manager.cpp
+	KPhysicalPartition.cpp
+	KShadowPartition.cpp
 
 	# jobs
 	KCreateChildJob.cpp

src/kernel/core/disk_device_manager/KDiskDevice.cpp

@@ -17,7 +17,7 @@
 
 // constructor
 KDiskDevice::KDiskDevice(partition_id id)
-	: KPartition(id),
+	: KPhysicalPartition(id),
 	  fDeviceData(),
 	  fLocker("diskdevice"),
 	  fFD(-1),
@@ -143,7 +143,7 @@ KDiskDevice::IsWriteLocked()
 void
 KDiskDevice::SetID(partition_id id)
 {
-	KPartition::SetID(id);
+	KPhysicalPartition::SetID(id);
 	fDeviceData.id = id;
 }
 
@@ -248,14 +248,6 @@ KDiskDevice::DeviceData() const
 	return &fDeviceData;
 }
 
-// CreateShadowPartition
-KPartition *
-KDiskDevice::CreateShadowPartition()
-{
-	// not implemented
-	return NULL;
-}
-
 // SetShadowOwner
 void
 KDiskDevice::SetShadowOwner(team_id team)
@@ -278,7 +270,7 @@ KDiskDevice::Dump(bool deep, int32 level)
 	OUT("  media status:      %s\n", strerror(fMediaStatus));
 	OUT("  device flags:      %lx\n", DeviceFlags());
 	if (fMediaStatus == B_OK)
-		KPartition::Dump(deep, 0);
+		KPhysicalPartition::Dump(deep, 0);
 }
 
 // GetMediaStatus

src/kernel/core/disk_device_manager/KDiskDeviceManager.cpp

@@ -203,9 +203,8 @@ KDiskDeviceManager::Unlock()
 
 // FindDevice
 KDiskDevice *
-KDiskDeviceManager::FindDevice(const char *path, bool noShadow)
+KDiskDeviceManager::FindDevice(const char *path)
 {
-// TODO: Handle shadows correctly!
 	for (int32 cookie = 0; KDiskDevice *device = NextDevice(&cookie); ) {
 		if (device->Path() && !strcmp(path, device->Path()))
 			return device;
@@ -215,9 +214,8 @@ KDiskDeviceManager::FindDevice(const char *path, bool noShadow)
 
 // FindDevice
 KDiskDevice *
-KDiskDeviceManager::FindDevice(partition_id id, bool noShadow)
+KDiskDeviceManager::FindDevice(partition_id id)
 {
-// TODO: Handle shadows correctly!
 	if (KPartition *partition = FindPartition(id))
 		return partition->Device();
 	return NULL;
@@ -227,7 +225,6 @@ KDiskDeviceManager::FindDevice(partition_id id, bool noShadow)
 KPartition *
 KDiskDeviceManager::FindPartition(const char *path, bool noShadow)
 {
-// TODO: Handle shadows correctly!
 // TODO: Optimize!
 	for (PartitionMap::Iterator it = fPartitions->Begin();
 		 it != fPartitions->End();
@@ -236,6 +233,8 @@ KDiskDeviceManager::FindPartition(const char *path, bool noShadow)
 		char partitionPath[B_PATH_NAME_LENGTH];
 		if (partition->GetPath(partitionPath) == B_OK
 			&& !strcmp(path, partitionPath)) {
+			if (noShadow && partition->IsShadowPartition())
+				return partition->PhysicalPartition();
 			return partition;
 		}
 	}
@@ -246,18 +245,19 @@ KDiskDeviceManager::FindPartition(const char *path, bool noShadow)
 KPartition *
 KDiskDeviceManager::FindPartition(partition_id id, bool noShadow)
 {
-// TODO: Handle shadows correctly!
 	PartitionMap::Iterator it = fPartitions->Find(id);
-	if (it != fPartitions->End())
+	if (it != fPartitions->End()) {
+		if (noShadow && it->Value()->IsShadowPartition())
+			return it->Value()->PhysicalPartition();
 		return it->Value();
+	}
 	return NULL;
 }
 
 // FindFileDevice
 KFileDiskDevice *
-KDiskDeviceManager::FindFileDevice(const char *filePath, bool noShadow)
+KDiskDeviceManager::FindFileDevice(const char *filePath)
 {
-// TODO: Handle shadows correctly!
 	for (int32 cookie = 0; KDiskDevice *device = NextDevice(&cookie); ) {
 		KFileDiskDevice *fileDevice = dynamic_cast<KFileDiskDevice*>(device);
 		if (fileDevice && fileDevice->FilePath()
@@ -270,11 +270,10 @@ KDiskDeviceManager::FindFileDevice(const char *filePath, bool noShadow)
 
 // RegisterDevice
 KDiskDevice *
-KDiskDeviceManager::RegisterDevice(const char *path, bool noShadow)
+KDiskDeviceManager::RegisterDevice(const char *path)
 {
-// TODO: Handle shadows correctly!
 	if (ManagerLocker locker = this) {
-		if (KDiskDevice *device = FindDevice(path, noShadow)) {
+		if (KDiskDevice *device = FindDevice(path)) {
 			device->Register();
 			return device;
 		}
@@ -284,11 +283,10 @@ KDiskDeviceManager::RegisterDevice(const char *path, bool noShadow)
 
 // RegisterDevice
 KDiskDevice *
-KDiskDeviceManager::RegisterDevice(partition_id id, bool noShadow)
+KDiskDeviceManager::RegisterDevice(partition_id id)
 {
-// TODO: Handle shadows correctly!
 	if (ManagerLocker locker = this) {
-		if (KDiskDevice *device = FindDevice(id, noShadow)) {
+		if (KDiskDevice *device = FindDevice(id)) {
 			device->Register();
 			return device;
 		}
@@ -339,10 +337,10 @@ KDiskDeviceManager::RegisterPartition(partition_id id, bool noShadow)
 
 // RegisterFileDevice
 KFileDiskDevice *
-KDiskDeviceManager::RegisterFileDevice(const char *filePath, bool noShadow)
+KDiskDeviceManager::RegisterFileDevice(const char *filePath)
 {
 	if (ManagerLocker locker = this) {
-		if (KFileDiskDevice *device = FindFileDevice(filePath, noShadow)) {
+		if (KFileDiskDevice *device = FindFileDevice(filePath)) {
 			device->Register();
 			return device;
 		}
@@ -572,8 +570,6 @@ KDiskDeviceManager::LoadNextDiskSystem(int32 *cookie)
 	if (!cookie)
 		return NULL;
 	if (ManagerLocker locker = this) {
-		// TODO: This loop assumes that the disk system list is ordered.
-		// Make sure that this is really the case.
 		if (KDiskSystem *diskSystem = NextDiskSystem(cookie)) {
 			if (diskSystem->Load() == B_OK) {
 				*cookie = diskSystem->ID() + 1;

src/kernel/core/disk_device_manager/KFileDiskDevice.cpp

@@ -118,14 +118,6 @@ KFileDiskDevice::FilePath() const
 	return fFilePath;
 }
 
-// CreateShadowPartition
-KPartition *
-KFileDiskDevice::CreateShadowPartition()
-{
-	// not implemented
-	return NULL;
-}
-
 // _RegisterDevice
 status_t
 KFileDiskDevice::_RegisterDevice(const char *file, const char *device)

src/kernel/core/disk_device_manager/KPartition.cpp

@@ -18,12 +18,12 @@
 
 using namespace std;
 
-// constructor
 // debugging
 //#define DBG(x)
 #define DBG(x) x
 #define OUT printf
 
+// constructor
 KPartition::KPartition(partition_id id)
 	: fPartitionData(),
 	  fChildren(),
@@ -446,7 +446,7 @@ KPartition::GetPath(char *path) const
 	int32 len = strlen(path);
 	if (len >= B_PATH_NAME_LENGTH - 10)
 		return B_NAME_TOO_LONG;
-	if (Parent() == Device()) {
+	if (Parent()->IsDevice()) {
 		// Our parent is a device, so we replace `raw' by our index.
 		int32 leafLen = strlen("/raw");
 		if (len <= leafLen || strcmp(path + len - leafLen, "/raw"))
@@ -579,29 +579,6 @@ KPartition::AddChild(KPartition *partition, int32 index)
 	return B_ERROR;
 }
 
-// CreateChild
-status_t
-KPartition::CreateChild(partition_id id, int32 index, KPartition **_child)
-{
-	// check parameters
-	int32 count = fPartitionData.child_count;
-	if (index == -1)
-		index = count;
-	if (index < 0 || index > count)
-		return B_BAD_VALUE;
-	// create and add partition
-	KPartition *child = new(nothrow) KPartition(id);
-	if (!child)
-		return B_NO_MEMORY;
-	status_t error = AddChild(child, index);
-	// cleanup / set result
-	if (error != B_OK)
-		delete child;
-	else if (_child)
-		*_child = child;
-	return error;
-}
-
 // RemoveChild
 bool
 KPartition::RemoveChild(int32 index)
@@ -666,34 +643,18 @@ KPartition::CountChildren() const
 }
 
 // CreateShadowPartition
-KPartition *
+status_t
 KPartition::CreateShadowPartition()
 {
-	// not implemented
-	return NULL;
+	// implemented by derived classes
+	return B_ERROR;
 }
 
 // DeleteShadowPartition
 void
 KPartition::DeleteShadowPartition()
 {
-	// not implemented
-}
-
-// ShadowPartition
-KPartition *
-KPartition::ShadowPartition() const
-{
-	// not implemented
-	return NULL;
-}
-
-// IsShadowPartition
-bool
-KPartition::IsShadowPartition() const
-{
-	// not implemented
-	return false;
+	// implemented by derived classes
 }
 
 // SetDiskSystem

src/kernel/core/disk_device_manager/KPhysicalPartition.cpp

@@ -0,0 +1,236 @@
+// KPhysicalPartition.cpp
+
+#include <errno.h>
+#include <fcntl.h>
+#include <new>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <Drivers.h>
+#include <Errors.h>
+
+#include "KDiskDevice.h"
+#include "KDiskDeviceManager.h"
+#include "KDiskDeviceUtils.h"
+#include "KPhysicalPartition.h"
+#include "KShadowPartition.h"
+
+using namespace std;
+
+// debugging
+//#define DBG(x)
+#define DBG(x) x
+#define OUT printf
+
+// constructor
+KPhysicalPartition::KPhysicalPartition(partition_id id)
+	: KPartition(id),
+	  fShadowPartition(NULL)
+{
+}
+
+// destructor
+KPhysicalPartition::~KPhysicalPartition()
+{
+}
+
+// Register
+// PrepareForRemoval
+bool
+KPhysicalPartition::PrepareForRemoval()
+{
+	bool result = KPartition::PrepareForRemoval();
+	if (result) {
+		DeleteShadowPartition();
+		UnpublishDevice();
+	}
+	return result;
+}
+
+// Open
+status_t
+KPhysicalPartition::Open(int flags, int *fd)
+{
+	if (!fd)
+		return B_BAD_VALUE;
+	// get the path
+	char path[B_PATH_NAME_LENGTH];
+	status_t error = GetPath(path);
+	if (error != B_OK)
+		return error;
+	// open the device
+	*fd = open(path, flags);
+	if (*fd < 0)
+		return errno;
+	return B_OK;
+}
+
+// PublishDevice
+status_t
+KPhysicalPartition::PublishDevice()
+{
+	// prepare a partition_info
+	partition_info info;
+	info.offset = Offset();
+	info.size = Size();
+	info.logical_block_size = BlockSize();
+	info.session = 0;
+	info.partition = ID();
+	if (strlen(Device()->Path()) >= 256)
+		return B_NAME_TOO_LONG;
+	strcpy(info.device, Device()->Path());
+	// get the entry path
+	char path[B_PATH_NAME_LENGTH];
+	status_t error = GetPath(path);
+	if (error != B_OK)
+		return error;
+	// create the entry
+	int fd = creat(path, 0666);
+	if (fd < 0)
+		return errno;
+	// set the partition info
+	error = B_OK;
+	if (ioctl(fd, B_SET_PARTITION, &info) < 0)
+		error = errno;
+	close(fd);
+	return error;
+}
+
+// UnpublishDevice
+status_t
+KPhysicalPartition::UnpublishDevice()
+{
+	// get the entry path
+	char path[B_PATH_NAME_LENGTH];
+	status_t error = GetPath(path);
+	if (error != B_OK)
+		return error;
+	// remove the entry
+	if (remove(path) < 0)
+		return errno;
+	return B_OK;
+}
+
+// Mount
+status_t
+KPhysicalPartition::Mount(uint32 mountFlags, const char *parameters)
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// Unmount
+status_t
+KPhysicalPartition::Unmount()
+{
+	// not implemented
+	return B_ERROR;
+}
+
+// CreateChild
+status_t
+KPhysicalPartition::CreateChild(partition_id id, int32 index,
+								KPartition **_child)
+{
+	// check parameters
+	int32 count = fPartitionData.child_count;
+	if (index == -1)
+		index = count;
+	if (index < 0 || index > count)
+		return B_BAD_VALUE;
+	// create and add partition
+	KPhysicalPartition *child = new(nothrow) KPhysicalPartition(id);
+	if (!child)
+		return B_NO_MEMORY;
+	status_t error = AddChild(child, index);
+	// cleanup / set result
+	if (error != B_OK)
+		delete child;
+	else if (_child)
+		*_child = child;
+	return error;
+}
+
+// CreateShadowPartition
+status_t
+KPhysicalPartition::CreateShadowPartition()
+{
+	if (fShadowPartition)
+		return B_BAD_VALUE;
+	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
+	if (ManagerLocker locker = manager) {
+		// create shadow partition
+		fShadowPartition = new(nothrow) KShadowPartition(this);
+		if (!fShadowPartition)
+			return B_NO_MEMORY;
+		// make it known to the manager
+		if (!manager->PartitionAdded(fShadowPartition)) {
+			delete fShadowPartition;
+			fShadowPartition = NULL;
+			return B_NO_MEMORY;
+		}
+	}
+	// create shadows for children
+	for (int32 i = 0; KPartition *child = ChildAt(i); i++) {
+		status_t error = child->CreateShadowPartition();
+		if (error == B_OK)
+			error = fShadowPartition->AddChild(child->ShadowPartition(), i);
+		// cleanup on error
+		if (error != B_OK) {
+			for (int32 k = 0; k <= i; i++)
+				ChildAt(k)->DeleteShadowPartition();
+			DeleteShadowPartition();
+			return error;
+		}
+	}
+	return B_OK;
+}
+
+// DeleteShadowPartition
+void
+KPhysicalPartition::DeleteShadowPartition()
+{
+	if (!fShadowPartition)
+		return;
+	// delete children's shadows
+	for (int32 i = 0; KPartition *child = ChildAt(i); i++)
+		child->DeleteShadowPartition();
+	// delete the thing
+	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
+	if (ManagerLocker locker = manager) {
+		fShadowPartition->SetPhysicalPartition(NULL);
+		PartitionRegistrar _(fShadowPartition);
+		manager->PartitionRemoved(fShadowPartition);
+		fShadowPartition = NULL;
+	}
+}
+
+// ShadowPartition
+KShadowPartition *
+KPhysicalPartition::ShadowPartition()
+{
+	return fShadowPartition;
+}
+
+// IsShadowPartition
+bool
+KPhysicalPartition::IsShadowPartition() const
+{
+	return false;
+}
+
+// PhysicalPartition
+KPhysicalPartition *
+KPhysicalPartition::PhysicalPartition()
+{
+	return this;
+}
+
+// Dump
+void
+KPhysicalPartition::Dump(bool deep, int32 level)
+{
+	KPartition::Dump(deep, level);
+}
+

src/kernel/core/disk_device_manager/KShadowPartition.cpp

@@ -0,0 +1,97 @@
+// KShadowPartition.cpp
+
+#include <errno.h>
+#include <fcntl.h>
+#include <new>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <Drivers.h>
+#include <Errors.h>
+
+#include "KDiskDevice.h"
+#include "KDiskDeviceManager.h"
+#include "KDiskDeviceUtils.h"
+#include "KShadowPartition.h"
+
+using namespace std;
+
+// debugging
+//#define DBG(x)
+#define DBG(x) x
+#define OUT printf
+
+// constructor
+KShadowPartition::KShadowPartition(KPhysicalPartition *partition)
+	: KPartition(),
+	  fPhysicalPartition(NULL)
+{
+	SetPhysicalPartition(partition);
+}
+
+// destructor
+KShadowPartition::~KShadowPartition()
+{
+}
+
+// CreateChild
+status_t
+KShadowPartition::CreateChild(partition_id id, int32 index,
+							  KPartition **_child)
+{
+	// check parameters
+	int32 count = fPartitionData.child_count;
+	if (index == -1)
+		index = count;
+	if (index < 0 || index > count)
+		return B_BAD_VALUE;
+	// create and add partition
+	KShadowPartition *child = new(nothrow) KShadowPartition(NULL);
+	if (!child)
+		return B_NO_MEMORY;
+	status_t error = AddChild(child, index);
+	// cleanup / set result
+	if (error != B_OK)
+		delete child;
+	else if (_child)
+		*_child = child;
+	return error;
+}
+
+// IsShadowPartition
+bool
+KShadowPartition::IsShadowPartition() const
+{
+	return true;
+}
+
+// ShadowPartition
+KShadowPartition*
+KShadowPartition::ShadowPartition()
+{
+	return this;
+}
+
+// SetPhysicalPartition
+void
+KShadowPartition::SetPhysicalPartition(KPhysicalPartition *partition)
+{
+	fPhysicalPartition = partition;
+// TODO: clone the data of the physical partition.
+}
+
+// PhysicalPartition
+KPhysicalPartition*
+KShadowPartition::PhysicalPartition()
+{
+	return fPhysicalPartition;
+}
+
+// Dump
+void
+KShadowPartition::Dump(bool deep, int32 level)
+{
+	KPartition::Dump(deep, level);
+}
+