* Added VMArea subclasses VM{Kernel,User}Area and moved the address space list

link to them.
* VM{Kernel,User}AddressSpace manage the respective VMArea subclass now, and
  VMAddressSpace has grown factory methods {Create,Delete}Area.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34493 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/vm/VMAddressSpace.h

@@ -66,6 +66,9 @@ public:
 	virtual	VMArea*				NextArea(VMArea* area) const = 0;
 
 	virtual	VMArea*				LookupArea(addr_t address) const = 0;
+	virtual	VMArea*				CreateArea(const char* name, uint32 wiring,
+									uint32 protection) = 0;
+	virtual	void				DeleteArea(VMArea* area) = 0;
 	virtual	status_t			InsertArea(void** _address, uint32 addressSpec,
 									addr_t size, VMArea* area) = 0;
 	virtual	void				RemoveArea(VMArea* area) = 0;

headers/private/kernel/vm/VMArea.h

@@ -48,50 +48,28 @@ struct VMArea {
 									{ return address >= fBase
 										&& address <= fBase + (fSize - 1); }
 
-	static	VMArea*				Create(VMAddressSpace* addressSpace,
-									const char* name, uint32 wiring,
-									uint32 protection);
-	static	VMArea*				CreateReserved(VMAddressSpace* addressSpace,
-									uint32 flags);
+protected:
+								VMArea(VMAddressSpace* addressSpace,
+									uint32 wiring, uint32 protection);
+								~VMArea();
 
-			DoublyLinkedListLink<VMArea>& AddressSpaceLink()
-									{ return fAddressSpaceLink; }
-			const DoublyLinkedListLink<VMArea>& AddressSpaceLink() const
-									{ return fAddressSpaceLink; }
+			status_t			Init(const char* name);
 
-private:
+protected:
 			friend class VMAddressSpace;
 			friend class VMKernelAddressSpace;
 			friend class VMUserAddressSpace;
 
-private:
+protected:
 			void				SetBase(addr_t base)	{ fBase = base; }
 			void				SetSize(size_t size)	{ fSize = size; }
 
-private:
-			DoublyLinkedListLink<VMArea> fAddressSpaceLink;
+protected:
 			addr_t				fBase;
 			size_t				fSize;
 };
 
 
-struct VMAddressSpaceAreaGetLink {
-    inline DoublyLinkedListLink<VMArea>* operator()(VMArea* area) const
-    {
-        return &area->AddressSpaceLink();
-    }
-
-    inline const DoublyLinkedListLink<VMArea>* operator()(
-		const VMArea* area) const
-    {
-        return &area->AddressSpaceLink();
-    }
-};
-
-typedef DoublyLinkedList<VMArea, VMAddressSpaceAreaGetLink>
-	VMAddressSpaceAreaList;
-
-
 struct VMAreaHashDefinition {
 	typedef area_id		KeyType;
 	typedef VMArea		ValueType;

src/system/kernel/vm/Jamfile

@@ -16,8 +16,10 @@ KernelMergeObject kernel_vm.o :
 	VMCache.cpp
 	VMDeviceCache.cpp
 	VMKernelAddressSpace.cpp
+	VMKernelArea.cpp
 	VMNullCache.cpp
 	VMUserAddressSpace.cpp
+	VMUserArea.cpp
 
 	: $(TARGET_KERNEL_PIC_CCFLAGS)
 ;

src/system/kernel/vm/VMArea.cpp

@@ -11,7 +11,6 @@
 #include <vm/VMArea.h>
 
 #include <heap.h>
-#include <vm/vm_priv.h>
 
 
 #define AREA_HASH_TABLE_SIZE 1024
@@ -24,61 +23,49 @@ static area_id sNextAreaID = 1;
 
 // #pragma mark - VMArea
 
+VMArea::VMArea(VMAddressSpace* addressSpace, uint32 wiring, uint32 protection)
+	:
+	name(NULL),
+	protection(protection),
+	wiring(wiring),
+	memory_type(0),
+	cache(NULL),
+	no_cache_change(0),
+	cache_offset(0),
+	cache_type(0),
+	page_protections(NULL),
+	address_space(addressSpace),
+	cache_next(NULL),
+	cache_prev(NULL),
+	hash_next(NULL)
+{
+	new (&mappings) VMAreaMappings;
+}
 
-/*static*/ VMArea*
-VMArea::Create(VMAddressSpace* addressSpace, const char* name,
-	uint32 wiring, uint32 protection)
+
+VMArea::~VMArea()
+{
+	free(page_protections);
+	free(name);
+}
+
+
+status_t
+VMArea::Init(const char* name)
 {
 	// restrict the area name to B_OS_NAME_LENGTH
 	size_t length = strlen(name) + 1;
 	if (length > B_OS_NAME_LENGTH)
 		length = B_OS_NAME_LENGTH;
 
-	VMArea* area = (VMArea*)malloc_nogrow(sizeof(VMArea));
-	if (area == NULL)
-		return NULL;
+	// clone the name
+	this->name = (char*)malloc_nogrow(length);
+	if (this->name == NULL)
+		return B_NO_MEMORY;
+	strlcpy(this->name, name, length);
 
-	area->name = (char*)malloc_nogrow(length);
-	if (area->name == NULL) {
-		free(area);
-		return NULL;
-	}
-	strlcpy(area->name, name, length);
-
-	area->id = atomic_add(&sNextAreaID, 1);
-	area->fBase = 0;
-	area->fSize = 0;
-	area->protection = protection;
-	area->wiring = wiring;
-	area->memory_type = 0;
-
-	area->cache = NULL;
-	area->cache_offset = 0;
-
-	area->address_space = addressSpace;
-	area->cache_next = area->cache_prev = NULL;
-	area->hash_next = NULL;
-	new (&area->mappings) VMAreaMappings;
-	area->page_protections = NULL;
-
-	return area;
-}
-
-
-/*static*/ VMArea*
-VMArea::CreateReserved(VMAddressSpace* addressSpace, uint32 flags)
-{
-	VMArea* reserved = (VMArea*)malloc_nogrow(sizeof(VMArea));
-	if (reserved == NULL)
-		return NULL;
-
-	memset(reserved, 0, sizeof(VMArea));
-	reserved->id = RESERVED_AREA_ID;
-		// this marks it as reserved space
-	reserved->protection = flags;
-	reserved->address_space = addressSpace;
-
-	return reserved;
+	id = atomic_add(&sNextAreaID, 1);
+	return B_OK;
 }
 
 
@@ -114,9 +101,6 @@ VMAreaHash::Find(const char* name)
 
 	for (VMAreaHashTable::Iterator it = sTable.GetIterator();
 			VMArea* area = it.Next();) {
-		if (area->id == RESERVED_AREA_ID)
-			continue;
-
 		if (strcmp(area->name, name) == 0) {
 			id = area->id;
 			break;

src/system/kernel/vm/VMKernelAddressSpace.cpp

@@ -56,7 +56,7 @@ VMKernelAddressSpace::~VMKernelAddressSpace()
 inline VMArea*
 VMKernelAddressSpace::FirstArea() const
 {
-	VMArea* area = fAreas.Head();
+	VMKernelArea* area = fAreas.Head();
 	while (area != NULL && area->id == RESERVED_AREA_ID)
 		area = fAreas.GetNext(area);
 	return area;
@@ -64,8 +64,9 @@ VMKernelAddressSpace::FirstArea() const
 
 
 inline VMArea*
-VMKernelAddressSpace::NextArea(VMArea* area) const
+VMKernelAddressSpace::NextArea(VMArea* _area) const
 {
+	VMKernelArea* area = static_cast<VMKernelArea*>(_area);
 	area = fAreas.GetNext(area);
 	while (area != NULL && area->id == RESERVED_AREA_ID)
 		area = fAreas.GetNext(area);
@@ -73,6 +74,21 @@ VMKernelAddressSpace::NextArea(VMArea* area) const
 }
 
 
+VMArea*
+VMKernelAddressSpace::CreateArea(const char* name, uint32 wiring,
+	uint32 protection)
+{
+	return VMKernelArea::Create(this, name, wiring, protection);
+}
+
+
+void
+VMKernelAddressSpace::DeleteArea(VMArea* area)
+{
+	delete static_cast<VMKernelArea*>(area);
+}
+
+
 //! You must hold the address space's read lock.
 VMArea*
 VMKernelAddressSpace::LookupArea(addr_t address) const
@@ -81,8 +97,8 @@ VMKernelAddressSpace::LookupArea(addr_t address) const
 	if (fAreaHint != NULL && fAreaHint->ContainsAddress(address))
 		return fAreaHint;
 
-	for (VMAddressSpaceAreaList::ConstIterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMKernelAreaList::ConstIterator it = fAreas.GetIterator();
+			VMKernelArea* area = it.Next();) {
 		if (area->id == RESERVED_AREA_ID)
 			continue;
 
@@ -103,8 +119,10 @@ VMKernelAddressSpace::LookupArea(addr_t address) const
 */
 status_t
 VMKernelAddressSpace::InsertArea(void** _address, uint32 addressSpec,
-	addr_t size, VMArea* area)
+	addr_t size, VMArea* _area)
 {
+	VMKernelArea* area = static_cast<VMKernelArea*>(_area);
+
 	addr_t searchBase, searchEnd;
 	status_t status;
 
@@ -146,8 +164,10 @@ VMKernelAddressSpace::InsertArea(void** _address, uint32 addressSpec,
 
 //! You must hold the address space's write lock.
 void
-VMKernelAddressSpace::RemoveArea(VMArea* area)
+VMKernelAddressSpace::RemoveArea(VMArea* _area)
 {
+	VMKernelArea* area = static_cast<VMKernelArea*>(_area);
+
 	fAreas.Remove(area);
 
 	if (area->id != RESERVED_AREA_ID) {
@@ -163,7 +183,7 @@ VMKernelAddressSpace::RemoveArea(VMArea* area)
 bool
 VMKernelAddressSpace::CanResizeArea(VMArea* area, size_t newSize)
 {
-	VMArea* next = fAreas.GetNext(area);
+	VMKernelArea* next = fAreas.GetNext(static_cast<VMKernelArea*>(area));
 	addr_t newEnd = area->Base() + (newSize - 1);
 	if (next == NULL) {
 		if (fEndAddress >= newEnd)
@@ -187,10 +207,12 @@ VMKernelAddressSpace::CanResizeArea(VMArea* area, size_t newSize)
 
 
 status_t
-VMKernelAddressSpace::ResizeArea(VMArea* area, size_t newSize)
+VMKernelAddressSpace::ResizeArea(VMArea* _area, size_t newSize)
 {
+	VMKernelArea* area = static_cast<VMKernelArea*>(_area);
+
 	addr_t newEnd = area->Base() + (newSize - 1);
-	VMArea* next = fAreas.GetNext(area);
+	VMKernelArea* next = fAreas.GetNext(area);
 	if (next != NULL && next->Base() <= newEnd) {
 		if (next->id != RESERVED_AREA_ID
 			|| next->cache_offset > area->Base()
@@ -256,7 +278,7 @@ VMKernelAddressSpace::ReserveAddressRange(void** _address, uint32 addressSpec,
 		return B_BAD_TEAM_ID;
 	}
 
-	VMArea* area = VMArea::CreateReserved(this, flags);
+	VMKernelArea* area = VMKernelArea::CreateReserved(this, flags);
 	if (area == NULL)
 		return B_NO_MEMORY;
 
@@ -286,8 +308,8 @@ VMKernelAddressSpace::UnreserveAddressRange(addr_t address, size_t size)
 
 	// search area list and remove any matching reserved ranges
 	addr_t endAddress = address + (size - 1);
-	for (VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMKernelAreaList::Iterator it = fAreas.GetIterator();
+			VMKernelArea* area = it.Next();) {
 		// the area must be completely part of the reserved range
 		if (area->Base() + (area->Size() - 1) > endAddress)
 			break;
@@ -306,8 +328,8 @@ VMKernelAddressSpace::UnreserveAddressRange(addr_t address, size_t size)
 void
 VMKernelAddressSpace::UnreserveAllAddressRanges()
 {
-	for (VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMKernelAreaList::Iterator it = fAreas.GetIterator();
+			VMKernelArea* area = it.Next();) {
 		if (area->id == RESERVED_AREA_ID) {
 			RemoveArea(area);
 			Put();
@@ -325,8 +347,8 @@ VMKernelAddressSpace::Dump() const
 
 	kprintf("area_list:\n");
 
-	for (VMAddressSpaceAreaList::ConstIterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMKernelAreaList::ConstIterator it = fAreas.GetIterator();
+			VMKernelArea* area = it.Next();) {
 		kprintf(" area 0x%lx: ", area->id);
 		kprintf("base_addr = 0x%lx ", area->Base());
 		kprintf("size = 0x%lx ", area->Size());
@@ -342,11 +364,11 @@ VMKernelAddressSpace::Dump() const
 */
 status_t
 VMKernelAddressSpace::_InsertAreaIntoReservedRegion(addr_t start, size_t size,
-	VMArea* area)
+	VMKernelArea* area)
 {
-	VMArea* next;
+	VMKernelArea* next;
 
-	for (VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
+	for (VMKernelAreaList::Iterator it = fAreas.GetIterator();
 			(next = it.Next()) != NULL;) {
 		if (next->Base() <= start
 			&& next->Base() + (next->Size() - 1) >= start + (size - 1)) {
@@ -390,7 +412,8 @@ VMKernelAddressSpace::_InsertAreaIntoReservedRegion(addr_t start, size_t size,
 	} else {
 		// the area splits the reserved range into two separate ones
 		// we need a new reserved area to cover this space
-		VMArea* reserved = VMArea::CreateReserved(this, next->protection);
+		VMKernelArea* reserved = VMKernelArea::CreateReserved(this,
+			next->protection);
 		if (reserved == NULL)
 			return B_NO_MEMORY;
 
@@ -416,10 +439,10 @@ VMKernelAddressSpace::_InsertAreaIntoReservedRegion(addr_t start, size_t size,
 /*!	Must be called with this address space's write lock held */
 status_t
 VMKernelAddressSpace::_InsertAreaSlot(addr_t start, addr_t size, addr_t end,
-	uint32 addressSpec, VMArea* area)
+	uint32 addressSpec, VMKernelArea* area)
 {
-	VMArea* last = NULL;
-	VMArea* next;
+	VMKernelArea* last = NULL;
+	VMKernelArea* next;
 	bool foundSpot = false;
 
 	TRACE(("VMKernelAddressSpace::_InsertAreaSlot: address space %p, start "
@@ -453,7 +476,7 @@ VMKernelAddressSpace::_InsertAreaSlot(addr_t start, addr_t size, addr_t end,
 
 	// walk up to the spot where we should start searching
 second_chance:
-	VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
+	VMKernelAreaList::Iterator it = fAreas.GetIterator();
 	while ((next = it.Next()) != NULL) {
 		if (next->Base() > start + (size - 1)) {
 			// we have a winner

src/system/kernel/vm/VMKernelAddressSpace.h

@@ -12,6 +12,8 @@
 
 #include <vm/VMAddressSpace.h>
 
+#include "VMKernelArea.h"
+
 
 struct VMKernelAddressSpace : VMAddressSpace {
 public:
@@ -23,6 +25,9 @@ public:
 	virtual	VMArea*				NextArea(VMArea* area) const;
 
 	virtual	VMArea*				LookupArea(addr_t address) const;
+	virtual	VMArea*				CreateArea(const char* name, uint32 wiring,
+									uint32 protection);
+	virtual	void				DeleteArea(VMArea* area);
 	virtual	status_t			InsertArea(void** _address, uint32 addressSpec,
 									addr_t size, VMArea* area);
 	virtual	void				RemoveArea(VMArea* area);
@@ -43,13 +48,13 @@ public:
 
 private:
 			status_t			_InsertAreaIntoReservedRegion(addr_t start,
-									size_t size, VMArea* area);
+									size_t size, VMKernelArea* area);
 			status_t			_InsertAreaSlot(addr_t start, addr_t size,
 									addr_t end, uint32 addressSpec,
-									VMArea* area);
+									VMKernelArea* area);
 
 private:
-			VMAddressSpaceAreaList fAreas;
+			VMKernelAreaList	fAreas;
 	mutable	VMArea*				fAreaHint;
 };
 

src/system/kernel/vm/VMKernelArea.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2009, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the NewOS License.
+ */
+
+
+#include "VMKernelArea.h"
+
+#include <heap.h>
+#include <vm/vm_priv.h>
+
+
+VMKernelArea::VMKernelArea(VMAddressSpace* addressSpace, uint32 wiring,
+	uint32 protection)
+	:
+	VMArea(addressSpace, wiring, protection)
+{
+}
+
+
+VMKernelArea::~VMKernelArea()
+{
+}
+
+
+/*static*/ VMKernelArea*
+VMKernelArea::Create(VMAddressSpace* addressSpace, const char* name,
+	uint32 wiring, uint32 protection)
+{
+	VMKernelArea* area = new(nogrow) VMKernelArea(addressSpace, wiring,
+		protection);
+	if (area == NULL)
+		return NULL;
+
+	if (area->Init(name) != B_OK) {
+		delete area;
+		return NULL;
+	}
+
+	return area;
+}
+
+
+/*static*/ VMKernelArea*
+VMKernelArea::CreateReserved(VMAddressSpace* addressSpace, uint32 flags)
+{
+	VMKernelArea* area = new(nogrow) VMKernelArea(addressSpace, 0, 0);
+	if (area != NULL)
+		area->id = RESERVED_AREA_ID;
+	return area;
+}

src/system/kernel/vm/VMKernelArea.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2009, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the NewOS License.
+ */
+#ifndef VM_KERNEL_AREA_H
+#define VM_KERNEL_AREA_H
+
+
+#include <vm/VMArea.h>
+
+
+struct VMKernelAddressSpace;
+
+
+struct VMKernelArea : VMArea {
+								VMKernelArea(VMAddressSpace* addressSpace,
+									uint32 wiring, uint32 protection);
+								~VMKernelArea();
+
+	static	VMKernelArea*		Create(VMAddressSpace* addressSpace,
+									const char* name, uint32 wiring,
+									uint32 protection);
+	static	VMKernelArea*		CreateReserved(VMAddressSpace* addressSpace,
+									uint32 flags);
+
+			DoublyLinkedListLink<VMKernelArea>& AddressSpaceLink()
+									{ return fAddressSpaceLink; }
+			const DoublyLinkedListLink<VMKernelArea>& AddressSpaceLink() const
+									{ return fAddressSpaceLink; }
+
+private:
+			DoublyLinkedListLink<VMKernelArea> fAddressSpaceLink;
+};
+
+
+struct VMKernelAreaGetLink {
+    inline DoublyLinkedListLink<VMKernelArea>* operator()(
+		VMKernelArea* area) const
+    {
+        return &area->AddressSpaceLink();
+    }
+
+    inline const DoublyLinkedListLink<VMKernelArea>* operator()(
+		const VMKernelArea* area) const
+    {
+        return &area->AddressSpaceLink();
+    }
+};
+
+typedef DoublyLinkedList<VMKernelArea, VMKernelAreaGetLink> VMKernelAreaList;
+
+
+#endif	// VM_KERNEL_AREA_H

src/system/kernel/vm/VMUserAddressSpace.cpp

@@ -56,7 +56,7 @@ VMUserAddressSpace::~VMUserAddressSpace()
 inline VMArea*
 VMUserAddressSpace::FirstArea() const
 {
-	VMArea* area = fAreas.Head();
+	VMUserArea* area = fAreas.Head();
 	while (area != NULL && area->id == RESERVED_AREA_ID)
 		area = fAreas.GetNext(area);
 	return area;
@@ -64,8 +64,9 @@ VMUserAddressSpace::FirstArea() const
 
 
 inline VMArea*
-VMUserAddressSpace::NextArea(VMArea* area) const
+VMUserAddressSpace::NextArea(VMArea* _area) const
 {
+	VMUserArea* area = static_cast<VMUserArea*>(_area);
 	area = fAreas.GetNext(area);
 	while (area != NULL && area->id == RESERVED_AREA_ID)
 		area = fAreas.GetNext(area);
@@ -73,6 +74,21 @@ VMUserAddressSpace::NextArea(VMArea* area) const
 }
 
 
+VMArea*
+VMUserAddressSpace::CreateArea(const char* name, uint32 wiring,
+	uint32 protection)
+{
+	return VMUserArea::Create(this, name, wiring, protection);
+}
+
+
+void
+VMUserAddressSpace::DeleteArea(VMArea* area)
+{
+	delete static_cast<VMUserArea*>(area);
+}
+
+
 //! You must hold the address space's read lock.
 VMArea*
 VMUserAddressSpace::LookupArea(addr_t address) const
@@ -81,8 +97,8 @@ VMUserAddressSpace::LookupArea(addr_t address) const
 	if (fAreaHint != NULL && fAreaHint->ContainsAddress(address))
 		return fAreaHint;
 
-	for (VMAddressSpaceAreaList::ConstIterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMUserAreaList::ConstIterator it = fAreas.GetIterator();
+			VMUserArea* area = it.Next();) {
 		if (area->id == RESERVED_AREA_ID)
 			continue;
 
@@ -103,8 +119,10 @@ VMUserAddressSpace::LookupArea(addr_t address) const
 */
 status_t
 VMUserAddressSpace::InsertArea(void** _address, uint32 addressSpec,
-	addr_t size, VMArea* area)
+	addr_t size, VMArea* _area)
 {
+	VMUserArea* area = static_cast<VMUserArea*>(_area);
+
 	addr_t searchBase, searchEnd;
 	status_t status;
 
@@ -146,8 +164,10 @@ VMUserAddressSpace::InsertArea(void** _address, uint32 addressSpec,
 
 //! You must hold the address space's write lock.
 void
-VMUserAddressSpace::RemoveArea(VMArea* area)
+VMUserAddressSpace::RemoveArea(VMArea* _area)
 {
+	VMUserArea* area = static_cast<VMUserArea*>(_area);
+
 	fAreas.Remove(area);
 
 	if (area->id != RESERVED_AREA_ID) {
@@ -163,7 +183,7 @@ VMUserAddressSpace::RemoveArea(VMArea* area)
 bool
 VMUserAddressSpace::CanResizeArea(VMArea* area, size_t newSize)
 {
-	VMArea* next = fAreas.GetNext(area);
+	VMUserArea* next = fAreas.GetNext(static_cast<VMUserArea*>(area));
 	addr_t newEnd = area->Base() + (newSize - 1);
 	if (next == NULL) {
 		if (fEndAddress >= newEnd)
@@ -187,10 +207,12 @@ VMUserAddressSpace::CanResizeArea(VMArea* area, size_t newSize)
 
 
 status_t
-VMUserAddressSpace::ResizeArea(VMArea* area, size_t newSize)
+VMUserAddressSpace::ResizeArea(VMArea* _area, size_t newSize)
 {
+	VMUserArea* area = static_cast<VMUserArea*>(_area);
+
 	addr_t newEnd = area->Base() + (newSize - 1);
-	VMArea* next = fAreas.GetNext(area);
+	VMUserArea* next = fAreas.GetNext(area);
 	if (next != NULL && next->Base() <= newEnd) {
 		if (next->id != RESERVED_AREA_ID
 			|| next->cache_offset > area->Base()
@@ -256,7 +278,7 @@ VMUserAddressSpace::ReserveAddressRange(void** _address, uint32 addressSpec,
 		return B_BAD_TEAM_ID;
 	}
 
-	VMArea* area = VMArea::CreateReserved(this, flags);
+	VMUserArea* area = VMUserArea::CreateReserved(this, flags);
 	if (area == NULL)
 		return B_NO_MEMORY;
 
@@ -286,8 +308,8 @@ VMUserAddressSpace::UnreserveAddressRange(addr_t address, size_t size)
 
 	// search area list and remove any matching reserved ranges
 	addr_t endAddress = address + (size - 1);
-	for (VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMUserAreaList::Iterator it = fAreas.GetIterator();
+			VMUserArea* area = it.Next();) {
 		// the area must be completely part of the reserved range
 		if (area->Base() + (area->Size() - 1) > endAddress)
 			break;
@@ -306,8 +328,8 @@ VMUserAddressSpace::UnreserveAddressRange(addr_t address, size_t size)
 void
 VMUserAddressSpace::UnreserveAllAddressRanges()
 {
-	for (VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMUserAreaList::Iterator it = fAreas.GetIterator();
+			VMUserArea* area = it.Next();) {
 		if (area->id == RESERVED_AREA_ID) {
 			RemoveArea(area);
 			Put();
@@ -325,8 +347,8 @@ VMUserAddressSpace::Dump() const
 
 	kprintf("area_list:\n");
 
-	for (VMAddressSpaceAreaList::ConstIterator it = fAreas.GetIterator();
-			VMArea* area = it.Next();) {
+	for (VMUserAreaList::ConstIterator it = fAreas.GetIterator();
+			VMUserArea* area = it.Next();) {
 		kprintf(" area 0x%lx: ", area->id);
 		kprintf("base_addr = 0x%lx ", area->Base());
 		kprintf("size = 0x%lx ", area->Size());
@@ -342,11 +364,11 @@ VMUserAddressSpace::Dump() const
 */
 status_t
 VMUserAddressSpace::_InsertAreaIntoReservedRegion(addr_t start, size_t size,
-	VMArea* area)
+	VMUserArea* area)
 {
-	VMArea* next;
+	VMUserArea* next;
 
-	for (VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
+	for (VMUserAreaList::Iterator it = fAreas.GetIterator();
 			(next = it.Next()) != NULL;) {
 		if (next->Base() <= start
 			&& next->Base() + (next->Size() - 1) >= start + (size - 1)) {
@@ -390,7 +412,8 @@ VMUserAddressSpace::_InsertAreaIntoReservedRegion(addr_t start, size_t size,
 	} else {
 		// the area splits the reserved range into two separate ones
 		// we need a new reserved area to cover this space
-		VMArea* reserved = VMArea::CreateReserved(this, next->protection);
+		VMUserArea* reserved = VMUserArea::CreateReserved(this,
+			next->protection);
 		if (reserved == NULL)
 			return B_NO_MEMORY;
 
@@ -416,10 +439,10 @@ VMUserAddressSpace::_InsertAreaIntoReservedRegion(addr_t start, size_t size,
 /*!	Must be called with this address space's write lock held */
 status_t
 VMUserAddressSpace::_InsertAreaSlot(addr_t start, addr_t size, addr_t end,
-	uint32 addressSpec, VMArea* area)
+	uint32 addressSpec, VMUserArea* area)
 {
-	VMArea* last = NULL;
-	VMArea* next;
+	VMUserArea* last = NULL;
+	VMUserArea* next;
 	bool foundSpot = false;
 
 	TRACE(("VMUserAddressSpace::_InsertAreaSlot: address space %p, start "
@@ -453,7 +476,7 @@ VMUserAddressSpace::_InsertAreaSlot(addr_t start, addr_t size, addr_t end,
 
 	// walk up to the spot where we should start searching
 second_chance:
-	VMAddressSpaceAreaList::Iterator it = fAreas.GetIterator();
+	VMUserAreaList::Iterator it = fAreas.GetIterator();
 	while ((next = it.Next()) != NULL) {
 		if (next->Base() > start + (size - 1)) {
 			// we have a winner

src/system/kernel/vm/VMUserAddressSpace.h

@@ -12,6 +12,8 @@
 
 #include <vm/VMAddressSpace.h>
 
+#include "VMUserArea.h"
+
 
 struct VMUserAddressSpace : VMAddressSpace {
 public:
@@ -23,6 +25,9 @@ public:
 	virtual	VMArea*				NextArea(VMArea* area) const;
 
 	virtual	VMArea*				LookupArea(addr_t address) const;
+	virtual	VMArea*				CreateArea(const char* name, uint32 wiring,
+									uint32 protection);
+	virtual	void				DeleteArea(VMArea* area);
 	virtual	status_t			InsertArea(void** _address, uint32 addressSpec,
 									addr_t size, VMArea* area);
 	virtual	void				RemoveArea(VMArea* area);
@@ -43,13 +48,13 @@ public:
 
 private:
 			status_t			_InsertAreaIntoReservedRegion(addr_t start,
-									size_t size, VMArea* area);
+									size_t size, VMUserArea* area);
 			status_t			_InsertAreaSlot(addr_t start, addr_t size,
 									addr_t end, uint32 addressSpec,
-									VMArea* area);
+									VMUserArea* area);
 
 private:
-			VMAddressSpaceAreaList fAreas;
+			VMUserAreaList	fAreas;
 	mutable	VMArea*				fAreaHint;
 };
 

src/system/kernel/vm/VMUserArea.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2009, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the NewOS License.
+ */
+
+
+#include "VMUserArea.h"
+
+#include <heap.h>
+#include <vm/vm_priv.h>
+
+
+VMUserArea::VMUserArea(VMAddressSpace* addressSpace, uint32 wiring,
+	uint32 protection)
+	:
+	VMArea(addressSpace, wiring, protection)
+{
+}
+
+
+VMUserArea::~VMUserArea()
+{
+}
+
+
+/*static*/ VMUserArea*
+VMUserArea::Create(VMAddressSpace* addressSpace, const char* name,
+	uint32 wiring, uint32 protection)
+{
+	VMUserArea* area = new(nogrow) VMUserArea(addressSpace, wiring,
+		protection);
+	if (area == NULL)
+		return NULL;
+
+	if (area->Init(name) != B_OK) {
+		delete area;
+		return NULL;
+	}
+
+	return area;
+}
+
+
+/*static*/ VMUserArea*
+VMUserArea::CreateReserved(VMAddressSpace* addressSpace, uint32 flags)
+{
+	VMUserArea* area = new(nogrow) VMUserArea(addressSpace, 0, 0);
+	if (area != NULL)
+		area->id = RESERVED_AREA_ID;
+	return area;
+}

src/system/kernel/vm/VMUserArea.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2009, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the NewOS License.
+ */
+#ifndef VM_USER_AREA_H
+#define VM_USER_AREA_H
+
+
+#include <vm/VMArea.h>
+
+
+struct VMUserAddressSpace;
+
+
+struct VMUserArea : VMArea {
+								VMUserArea(VMAddressSpace* addressSpace,
+									uint32 wiring, uint32 protection);
+								~VMUserArea();
+
+	static	VMUserArea*			Create(VMAddressSpace* addressSpace,
+									const char* name, uint32 wiring,
+									uint32 protection);
+	static	VMUserArea*			CreateReserved(VMAddressSpace* addressSpace,
+									uint32 flags);
+
+			DoublyLinkedListLink<VMUserArea>& AddressSpaceLink()
+									{ return fAddressSpaceLink; }
+			const DoublyLinkedListLink<VMUserArea>& AddressSpaceLink() const
+									{ return fAddressSpaceLink; }
+
+private:
+			DoublyLinkedListLink<VMUserArea> fAddressSpaceLink;
+};
+
+
+struct VMUserAreaGetLink {
+    inline DoublyLinkedListLink<VMUserArea>* operator()(
+		VMUserArea* area) const
+    {
+        return &area->AddressSpaceLink();
+    }
+
+    inline const DoublyLinkedListLink<VMUserArea>* operator()(
+		const VMUserArea* area) const
+    {
+        return &area->AddressSpaceLink();
+    }
+};
+
+typedef DoublyLinkedList<VMUserArea, VMUserAreaGetLink> VMUserAreaList;
+
+
+#endif	// VM_USER_AREA_H

src/system/kernel/vm/vm.cpp

@@ -503,7 +503,7 @@ map_backing_store(VMAddressSpace* addressSpace, VMCache* cache,
 		addressSpec, wiring, protection, _area, areaName));
 	cache->AssertLocked();
 
-	VMArea* area = VMArea::Create(addressSpace, areaName, wiring, protection);
+	VMArea* area = addressSpace->CreateArea(areaName, wiring, protection);
 	if (area == NULL)
 		return B_NO_MEMORY;
 
@@ -594,8 +594,7 @@ err2:
 		sourceCache->Lock();
 	}
 err1:
-	free(area->name);
-	free(area);
+	addressSpace->DeleteArea(area);
 	return status;
 }
 
@@ -1584,9 +1583,7 @@ delete_area(VMAddressSpace* addressSpace, VMArea* area)
 	area->cache->RemoveArea(area);
 	area->cache->ReleaseRef();
 
-	free(area->page_protections);
-	free(area->name);
-	free(area);
+	addressSpace->DeleteArea(area);
 }