Mmh, apparently I have to check the copied directory itself in first.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20345 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/ramfs/AllocationInfo.cpp

@@ -0,0 +1,236 @@
+// AllocationInfo.cpp
+
+#include "AllocationInfo.h"
+#include "Debug.h"
+
+#include "Attribute.h"
+#include "Directory.h"
+#include "Entry.h"
+#include "File.h"
+#include "SymLink.h"
+
+// constructor
+AllocationInfo::AllocationInfo()
+	: fNodeTableArraySize(0),
+	  fNodeTableVectorSize(0),
+	  fNodeTableElementCount(0),
+	  fDirectoryEntryTableArraySize(0),
+	  fDirectoryEntryTableVectorSize(0),
+	  fDirectoryEntryTableElementCount(0),
+	  fNodeAttributeTableArraySize(0),
+	  fNodeAttributeTableVectorSize(0),
+	  fNodeAttributeTableElementCount(0),
+
+	  fAttributeCount(0),
+	  fAttributeSize(0),
+	  fDirectoryCount(0),
+	  fEntryCount(0),
+	  fFileCount(0),
+	  fFileSize(0),
+	  fSymLinkCount(0),
+	  fSymLinkSize(0),
+
+	  fAreaCount(0),
+	  fAreaSize(0),
+	  fBlockCount(0),
+	  fBlockSize(0),
+	  fListCount(0),
+	  fListSize(0),
+	  fOtherCount(0),
+	  fOtherSize(0),
+	  fStringCount(0),
+	  fStringSize(0)
+{
+}
+
+// destructor
+AllocationInfo::~AllocationInfo()
+{
+}
+
+// AddNodeTableAllocation
+void
+AllocationInfo::AddNodeTableAllocation(size_t arraySize, size_t vectorSize,
+									   size_t elementSize, size_t elementCount)
+{
+	fNodeTableArraySize += arraySize;
+	fNodeTableVectorSize += vectorSize * elementSize;
+	fNodeTableElementCount += elementCount;
+}
+
+// AddDirectoryEntryTableAllocation
+void
+AllocationInfo::AddDirectoryEntryTableAllocation(size_t arraySize,
+												 size_t vectorSize,
+												 size_t elementSize,
+												 size_t elementCount)
+{
+	fDirectoryEntryTableArraySize += arraySize;
+	fDirectoryEntryTableVectorSize += vectorSize * elementSize;
+	fDirectoryEntryTableElementCount += elementCount;
+}
+
+// AddNodeAttributeTableAllocation
+void
+AllocationInfo::AddNodeAttributeTableAllocation(size_t arraySize,
+												size_t vectorSize,
+												size_t elementSize,
+												size_t elementCount)
+{
+	fNodeAttributeTableArraySize += arraySize;
+	fNodeAttributeTableVectorSize += vectorSize * elementSize;
+	fNodeAttributeTableElementCount += elementCount;
+}
+
+// AddAttributeAllocation
+void
+AllocationInfo::AddAttributeAllocation(size_t size)
+{
+	fAttributeCount++;
+	fAttributeSize += size;
+}
+
+// AddDirectoryAllocation
+void
+AllocationInfo::AddDirectoryAllocation()
+{
+	fDirectoryCount++;
+}
+
+// AddEntryAllocation
+void
+AllocationInfo::AddEntryAllocation()
+{
+	fEntryCount++;
+}
+
+// AddFileAllocation
+void
+AllocationInfo::AddFileAllocation(size_t size)
+{
+	fFileCount++;
+	fFileSize += size;
+}
+
+// AddSymLinkAllocation
+void
+AllocationInfo::AddSymLinkAllocation(size_t size)
+{
+	fSymLinkCount++;
+	fSymLinkSize += size;
+}
+
+// AddAreaAllocation
+void
+AllocationInfo::AddAreaAllocation(size_t size, size_t count)
+{
+	fAreaCount += count;
+	fAreaSize += count * size;
+}
+
+// AddBlockAllocation
+void
+AllocationInfo::AddBlockAllocation(size_t size)
+{
+	fBlockCount++;
+	fBlockSize += size;
+}
+
+// AddListAllocation
+void
+AllocationInfo::AddListAllocation(size_t capacity, size_t elementSize)
+{
+	fListCount += 1;
+	fListSize += capacity * elementSize;
+}
+
+// AddOtherAllocation
+void
+AllocationInfo::AddOtherAllocation(size_t size, size_t count)
+{
+	fOtherCount += count;
+	fOtherSize += size * count;
+}
+
+// AddStringAllocation
+void
+AllocationInfo::AddStringAllocation(size_t size)
+{
+	fStringCount++;
+	fStringSize += size;
+}
+
+// Dump
+void
+AllocationInfo::Dump() const
+{
+	size_t heapCount = 0;
+	size_t heapSize = 0;
+	size_t areaCount = 0;
+	size_t areaSize = 0;
+
+	PRINT(("  node table:\n"));
+	PRINT(("    array size:  %9lu\n", fNodeTableArraySize));
+	PRINT(("    vector size: %9lu\n", fNodeTableVectorSize));
+	PRINT(("    elements:    %9lu\n", fNodeTableElementCount));
+	areaCount += 2;
+	areaSize += fNodeTableArraySize * sizeof(int32) + fNodeTableVectorSize;
+
+	PRINT(("  entry table:\n"));
+	PRINT(("    array size:  %9lu\n", fDirectoryEntryTableArraySize));
+	PRINT(("    vector size: %9lu\n", fDirectoryEntryTableVectorSize));
+	PRINT(("    elements:    %9lu\n", fDirectoryEntryTableElementCount));
+	areaCount += 2;
+	areaSize += fDirectoryEntryTableArraySize * sizeof(int32)
+				+ fDirectoryEntryTableVectorSize;
+
+	PRINT(("  attribute table:\n"));
+	PRINT(("    array size:  %9lu\n", fNodeAttributeTableArraySize));
+	PRINT(("    vector size: %9lu\n", fNodeAttributeTableVectorSize));
+	PRINT(("    elements:    %9lu\n", fNodeAttributeTableElementCount));
+	areaCount += 2;
+	areaSize += fNodeAttributeTableArraySize * sizeof(int32)
+				+ fNodeAttributeTableVectorSize;
+
+	PRINT(("  attributes:  %9lu, size: %9lu\n", fAttributeCount, fAttributeSize));
+	heapCount += fAttributeCount;
+	heapSize += fAttributeCount * sizeof(Attribute);
+
+	PRINT(("  directories: %9lu\n", fDirectoryCount));
+	heapCount += fDirectoryCount;
+	heapSize += fDirectoryCount * sizeof(Directory);
+
+	PRINT(("  entries:     %9lu\n", fEntryCount));
+	heapCount += fEntryCount;
+	heapSize += fEntryCount * sizeof(Entry);
+
+	PRINT(("  files:       %9lu, size: %9lu\n", fFileCount, fFileSize));
+	heapCount += fFileCount;
+	heapSize += fFileCount * sizeof(File);
+
+	PRINT(("  symlinks:    %9lu, size: %9lu\n", fSymLinkCount, fSymLinkSize));
+	heapCount += fSymLinkCount;
+	heapSize += fSymLinkCount * sizeof(SymLink);
+
+	PRINT(("  areas:       %9lu, size: %9lu\n", fAreaCount, fAreaSize));
+	areaCount += fAreaCount;
+	areaSize += fAreaSize;
+
+	PRINT(("  blocks:      %9lu, size: %9lu\n", fBlockCount, fBlockSize));
+
+	PRINT(("  lists:       %9lu, size: %9lu\n", fListCount, fListSize));
+	heapCount += fListCount;
+	heapSize += fListSize;
+
+	PRINT(("  other:       %9lu, size: %9lu\n", fOtherCount, fOtherSize));
+	heapCount += fOtherCount;
+	heapSize += fOtherSize;
+
+	PRINT(("  strings:     %9lu, size: %9lu\n", fStringCount, fStringSize));
+	heapCount += fStringCount;
+	heapSize += fStringSize;
+
+	PRINT(("heap:  %9lu allocations, size: %9lu\n", heapCount, heapSize));
+	PRINT(("areas: %9lu allocations, size: %9lu\n", areaCount, areaSize));
+}
+

src/add-ons/kernel/file_systems/ramfs/AllocationInfo.h

@@ -0,0 +1,68 @@
+// AllocationInfo.h
+
+#ifndef ALLOCATION_INFO_H
+#define ALLOCATION_INFO_H
+
+#include <SupportDefs.h>
+
+class AllocationInfo {
+public:
+	AllocationInfo();
+	~AllocationInfo();
+
+	void AddNodeTableAllocation(size_t arraySize, size_t vectorSize,
+								size_t elementSize, size_t elementCount);
+	void AddDirectoryEntryTableAllocation(size_t arraySize, size_t vectorSize,
+										  size_t elementSize,
+										  size_t elementCount);
+	void AddNodeAttributeTableAllocation(size_t arraySize, size_t vectorSize,
+										 size_t elementSize,
+										 size_t elementCount);
+
+	void AddAttributeAllocation(size_t size);
+	void AddDirectoryAllocation();
+	void AddEntryAllocation();
+	void AddFileAllocation(size_t size);
+	void AddSymLinkAllocation(size_t size);
+
+	void AddAreaAllocation(size_t size, size_t count = 1);
+	void AddBlockAllocation(size_t size);
+	void AddListAllocation(size_t capacity, size_t elementSize);
+	void AddOtherAllocation(size_t size, size_t count = 1);
+	void AddStringAllocation(size_t size);
+
+	void Dump() const;
+
+private:
+	size_t	fNodeTableArraySize;
+	size_t	fNodeTableVectorSize;
+	size_t	fNodeTableElementCount;
+	size_t	fDirectoryEntryTableArraySize;
+	size_t	fDirectoryEntryTableVectorSize;
+	size_t	fDirectoryEntryTableElementCount;
+	size_t	fNodeAttributeTableArraySize;
+	size_t	fNodeAttributeTableVectorSize;
+	size_t	fNodeAttributeTableElementCount;
+
+	size_t	fAttributeCount;
+	size_t	fAttributeSize;
+	size_t	fDirectoryCount;
+	size_t	fEntryCount;
+	size_t	fFileCount;
+	size_t	fFileSize;
+	size_t	fSymLinkCount;
+	size_t	fSymLinkSize;
+
+	size_t	fAreaCount;
+	size_t	fAreaSize;
+	size_t	fBlockCount;
+	size_t	fBlockSize;
+	size_t	fListCount;
+	size_t	fListSize;
+	size_t	fOtherCount;
+	size_t	fOtherSize;
+	size_t	fStringCount;
+	size_t	fStringSize;
+};
+
+#endif	// ALLOCATION_INFO_H

src/add-ons/kernel/file_systems/ramfs/AreaUtils.cpp

@@ -0,0 +1,160 @@
+// AreaUtils.cpp
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+// 
+// Except as contained in this notice, the name of a copyright holder shall
+// not be used in advertising or otherwise to promote the sale, use or other
+// dealings in this Software without prior written authorization of the
+// copyright holder.
+
+#include <algobase.h>
+#include <OS.h>
+
+#include "AreaUtils.h"
+#include "Debug.h"
+
+#ifndef USE_STANDARD_FUNCTIONS
+#define USE_STANDARD_FUNCTIONS 0
+#endif
+
+
+// area_info_for
+static
+status_t
+area_info_for(void *address, area_info *info)
+{
+	status_t error = B_OK;
+	if (address) {
+		// get the area ID for the ptr
+		area_id area = area_for(address);
+		// check if supplied pointer points to the beginning of the area
+		if (area >= 0)
+			error = get_area_info(area, info);
+		else
+			error = area;
+	} else
+		error = B_BAD_VALUE;
+	return error;
+}
+
+// calloc
+void *
+AreaUtils::calloc(size_t nmemb, size_t size)
+{
+//PRINT(("AreaUtils::calloc(%lu, %lu)\n", nmemb, size));
+	return AreaUtils::malloc(nmemb * size);
+}
+
+// free
+void 
+AreaUtils::free(void *ptr)
+{
+//PRINT(("AreaUtils::free(%p)\n", ptr));
+#if USE_STANDARD_FUNCTIONS
+	return ::free(ptr);
+#else
+	if (ptr) {
+		// get the area for the pointer
+		area_info info;
+		if (area_info_for(ptr, &info) == B_OK) {
+			if (ptr == info.address) {
+				// everything is fine, delete the area
+				delete_area(info.area);
+			} else {
+				INFORM(("WARNING: AreaUtils::free(%p): area begin is %p."
+						"Ignored.\n", ptr, info.address));
+			}
+		}
+	}
+#endif
+}
+
+// malloc
+void *
+AreaUtils::malloc(size_t size)
+{
+//PRINT(("AreaUtils::malloc(%lu)\n", size));
+#if USE_STANDARD_FUNCTIONS
+	return ::malloc(size);
+#else
+	void *address = NULL;
+	if (size > 0) {
+		// round to multiple of page size
+		size = (size + B_PAGE_SIZE - 1) / B_PAGE_SIZE * B_PAGE_SIZE;
+		// create an area
+#if USER
+		area_id area = create_area("AreaUtils::malloc", &address,
+								   B_ANY_ADDRESS, size, B_NO_LOCK,
+								   B_WRITE_AREA | B_READ_AREA);
+#else
+		area_id area = create_area("AreaUtils::malloc", &address,
+								   B_ANY_KERNEL_ADDRESS, size, B_FULL_LOCK,
+								   B_READ_AREA | B_WRITE_AREA);
+#endif
+		if (area < 0)
+			address = NULL;
+	}
+	return address;
+#endif
+}
+
+// realloc
+void *
+AreaUtils::realloc(void * ptr, size_t size)
+{
+//PRINT(("AreaUtils::realloc(%p, %lu)\n", ptr, size))
+#if USE_STANDARD_FUNCTIONS
+	return ::realloc(ptr, size);
+#else
+	void *newAddress = NULL;
+	if (size == 0) {
+		AreaUtils::free(ptr);
+	} else if (ptr) {
+		// get the area for the pointer
+		area_info info;
+		if (area_info_for(ptr, &info) == B_OK) {
+			if (ptr == info.address) {
+				// round to multiple of page size
+				size = (size + B_PAGE_SIZE - 1) / B_PAGE_SIZE * B_PAGE_SIZE;
+				if (size == info.size) {
+					// nothing to do
+					newAddress = ptr;
+				} else if (resize_area(info.area, size) == B_OK) {
+					// resizing the area went fine
+					newAddress = ptr;
+				} else {
+					// resizing the area failed: we need to allocate a new one
+					newAddress = AreaUtils::malloc(size);
+					if (newAddress) {
+						memcpy(newAddress, ptr, min(size, info.size));
+						delete_area(info.area);
+					}
+				}
+			} else {
+				INFORM(("WARNING: AreaUtils::realloc(%p): area begin is %p."
+						"Ignored.\n", ptr, info.address));
+			}
+		}
+	}
+	return newAddress;
+#endif
+}
+

src/add-ons/kernel/file_systems/ramfs/AreaUtils.h

@@ -0,0 +1,40 @@
+// AreaUtils.h
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+// 
+// Except as contained in this notice, the name of a copyright holder shall
+// not be used in advertising or otherwise to promote the sale, use or other
+// dealings in this Software without prior written authorization of the
+// copyright holder.
+
+#ifndef AREA_UTILS_H
+#define AREA_UTILS_H
+
+namespace AreaUtils {
+
+	void *calloc(size_t nmemb, size_t size);
+	void free(void *ptr);
+	void *malloc(size_t size);
+	void *realloc(void * ptr, size_t size);
+
+};
+
+#endif	// AREA_UTILS_H

src/add-ons/kernel/file_systems/ramfs/Attribute.cpp

@@ -0,0 +1,136 @@
+// Attribute.cpp
+
+#include "AllocationInfo.h"
+#include "Attribute.h"
+#include "Misc.h"
+#include "Node.h"
+#include "ramfs.h"
+#include "Volume.h"
+
+// constructor
+Attribute::Attribute(Volume *volume, Node *node, const char *name,
+					 uint32 type)
+	: DataContainer(volume),
+	  fNode(node),
+	  fName(name),
+	  fType(type),
+	  fIndex(NULL),
+	  fInIndex(false),
+	  fIterators()
+{
+}
+
+// destructor
+Attribute::~Attribute()
+{
+}
+
+// InitCheck
+status_t
+Attribute::InitCheck() const
+{
+	return (fName.GetString() ? B_OK : B_NO_INIT);
+}
+
+// SetType
+void
+Attribute::SetType(uint32 type)
+{
+	if (type != fType) {
+		if (fIndex)
+			fIndex->Removed(this);
+		fType = type;
+		if (AttributeIndex *index = GetVolume()->FindAttributeIndex(GetName(),
+																	fType)) {
+			index->Added(this);
+		}
+	}
+}
+
+// WriteAt
+status_t
+Attribute::WriteAt(off_t offset, const void *buffer, size_t size,
+				   size_t *bytesWritten)
+{
+	// get the current key for the attribute
+	uint8 oldKey[kMaxIndexKeyLength];
+	size_t oldLength;
+	GetKey(oldKey, &oldLength);
+
+	// write the new value
+	status_t error = DataContainer::WriteAt(offset, buffer, size, bytesWritten);
+
+	// If there is an index and a change has been made within the key, notify
+	// the index.
+	if (offset < kMaxIndexKeyLength && size > 0 && fIndex)
+		fIndex->Changed(this, oldKey, oldLength);
+
+	// update live queries
+	const uint8* newKey;
+	size_t newLength;
+	GetKey(&newKey, &newLength);
+	GetVolume()->UpdateLiveQueries(NULL, fNode, GetName(), fType, oldKey,
+		oldLength, newKey, newLength);
+
+	// node has been changed
+	if (fNode && size > 0)
+		fNode->MarkModified();
+
+	return error;
+}
+
+// SetIndex
+void
+Attribute::SetIndex(AttributeIndex *index, bool inIndex)
+{
+	fIndex = index;
+	fInIndex = inIndex;
+}
+
+// GetKey
+void
+Attribute::GetKey(const uint8 **key, size_t *length)
+{
+	if (key && length) {
+		GetFirstDataBlock(key, length);
+		*length = min(*length, kMaxIndexKeyLength);
+	}
+}
+
+// GetKey
+void
+Attribute::GetKey(uint8 *key, size_t *length)
+{
+	if (key && length) {
+		const uint8 *originalKey = NULL;
+		GetKey(&originalKey, length);
+		if (length > 0)
+			memcpy(key, originalKey, *length);
+	}
+}
+
+// AttachAttributeIterator
+void
+Attribute::AttachAttributeIterator(AttributeIterator *iterator)
+{
+	if (iterator && iterator->GetCurrent() == this && !iterator->IsSuspended())
+		fIterators.Insert(iterator);
+}
+
+// DetachAttributeIterator
+void
+Attribute::DetachAttributeIterator(AttributeIterator *iterator)
+{
+	if (iterator && iterator->GetCurrent() == this && iterator->IsSuspended())
+		fIterators.Remove(iterator);
+}
+
+// GetAllocationInfo
+void
+Attribute::GetAllocationInfo(AllocationInfo &info)
+{
+	DataContainer::GetAllocationInfo(info);
+	info.AddAttributeAllocation(GetSize());
+	info.AddStringAllocation(fName.GetLength());
+}
+

src/add-ons/kernel/file_systems/ramfs/Attribute.h

@@ -0,0 +1,61 @@
+// Attribute.h
+
+#ifndef ATTRIBUTE_H
+#define ATTRIBUTE_H
+
+#include "AttributeIndex.h"
+#include "AttributeIterator.h"
+#include "DataContainer.h"
+#include "DLList.h"
+#include "String.h"
+
+class AllocationInfo;
+class Node;
+class Volume;
+
+class Attribute : public DataContainer, public DLListLinkImpl<Attribute> {
+public:
+	Attribute(Volume *volume, Node *node, const char *name, uint32 type = 0);
+	~Attribute();
+
+	status_t InitCheck() const;
+
+	void SetNode(Node *node)	{ fNode = node; }
+	Node *GetNode() const		{ return fNode; }
+
+	const char *GetName() { return fName.GetString(); }
+
+	void SetType(uint32 type);
+	uint32 GetType() const		{ return fType; }
+
+	virtual status_t WriteAt(off_t offset, const void *buffer, size_t size,
+							 size_t *bytesWritten);
+
+	// index support
+	void SetIndex(AttributeIndex *index, bool inIndex);
+	AttributeIndex *GetIndex() const	{ return fIndex; }
+	bool IsInIndex() const				{ return fInIndex; }
+	void GetKey(const uint8 **key, size_t *length);
+	void GetKey(uint8 *key, size_t *length);
+
+	// iterator management
+	void AttachAttributeIterator(AttributeIterator *iterator);
+	void DetachAttributeIterator(AttributeIterator *iterator);
+	inline DLList<AttributeIterator> *GetAttributeIteratorList()
+		{ return &fIterators; }
+
+	// debugging
+	void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	Node						*fNode;
+	String						fName;
+	uint32						fType;
+	AttributeIndex				*fIndex;
+	bool						fInIndex;
+
+	// iterator management
+	DLList<AttributeIterator>	fIterators;
+};
+
+#endif	// ATTRIBUTE_H

src/add-ons/kernel/file_systems/ramfs/AttributeIndex.cpp

@@ -0,0 +1,16 @@
+// AttributeIndex.cpp
+
+#include "AttributeIndex.h"
+
+// constructor
+AttributeIndex::AttributeIndex(Volume *volume, const char *name, uint32 type,
+							   bool fixedKeyLength, size_t keyLength)
+	: Index(volume, name, type, fixedKeyLength, keyLength)
+{
+}
+
+// destructor
+AttributeIndex::~AttributeIndex()
+{
+}
+

src/add-ons/kernel/file_systems/ramfs/AttributeIndex.h

@@ -0,0 +1,22 @@
+// AttributeIndex.h
+
+#ifndef ATTRIBUTE_INDEX_H
+#define ATTRIBUTE_INDEX_H
+
+#include "Index.h"
+
+class Attribute;
+
+class AttributeIndex : public Index {
+public:
+	AttributeIndex(Volume *volume, const char *name, uint32 type,
+				   bool fixedKeyLength, size_t keyLength = 0);
+	virtual ~AttributeIndex();
+
+	virtual status_t Added(Attribute *attribute) = 0;
+	virtual bool Removed(Attribute *attribute) = 0;
+	virtual status_t Changed(Attribute *attribute,
+							 const uint8 *oldKey, size_t length) = 0;
+};
+
+#endif	// ATTRIBUTE_INDEX_H

src/add-ons/kernel/file_systems/ramfs/AttributeIndexImpl.cpp

@@ -0,0 +1,514 @@
+// AttributeIndexImpl.cpp
+
+#include <TypeConstants.h>
+
+#include "AttributeIndexImpl.h"
+#include "Debug.h"
+#include "Entry.h"
+#include "EntryListener.h"
+#include "IndexImpl.h"
+#include "Misc.h"
+#include "Node.h"
+#include "NodeListener.h"
+#include "ramfs.h"
+#include "TwoKeyAVLTree.h"
+#include "Volume.h"
+
+// compare_integral
+template<typename Key>
+static inline
+int
+compare_integral(const Key &a, const Key &b)
+{
+	if (a < b)
+		return -1;
+	else if (a > b)
+		return 1;
+	return 0;
+}
+
+// compare_keys
+static
+int
+compare_keys(const uint8 *key1, size_t length1, const uint8 *key2,
+			 size_t length2, uint32 type)
+{
+	switch (type) {
+		case B_INT32_TYPE:
+			return compare_integral(*(int32*)key1, *(int32*)key2);
+		case B_UINT32_TYPE:
+			return compare_integral(*(uint32*)key1, *(uint32*)key2);
+		case B_INT64_TYPE:
+			return compare_integral(*(int64*)key1, *(int64*)key2);
+		case B_UINT64_TYPE:
+			return compare_integral(*(uint64*)key1, *(uint64*)key2);
+		case B_FLOAT_TYPE:
+			return compare_integral(*(float*)key1, *(float*)key2);
+		case B_DOUBLE_TYPE:
+			return compare_integral(*(double*)key1, *(double*)key2);
+		case B_STRING_TYPE:
+		{
+			int result = strncmp((const char*)key1, (const char*)key2,
+								 min(length1, length2));
+			if (result == 0) {
+				result = compare_integral(strnlen((const char*)key1, length1),
+										  strnlen((const char*)key2, length2));
+			}
+			return result;
+		}
+	}
+	return -1;
+}
+
+// PrimaryKey
+class AttributeIndexImpl::PrimaryKey {
+public:
+	PrimaryKey(Attribute *attribute, const uint8 *key,
+			   size_t length)
+		: attribute(attribute), key(key), length(length) {}
+	PrimaryKey(Attribute *attribute)
+		: attribute(attribute) { attribute->GetKey(&key, &length); }
+	PrimaryKey(const uint8 *key, size_t length)
+		: attribute(NULL), key(key), length(length) {}
+
+	Attribute	*attribute;
+	const uint8	*key;
+	size_t		length;
+};
+
+// GetPrimaryKey
+class AttributeIndexImpl::GetPrimaryKey {
+public:
+	inline PrimaryKey operator()(Attribute *a)
+	{
+		return PrimaryKey(a);
+	}
+
+	inline PrimaryKey operator()(Attribute *a) const
+	{
+		return PrimaryKey(a);
+	}
+};
+
+// PrimaryKeyCompare
+class AttributeIndexImpl::PrimaryKeyCompare
+{
+public:
+	PrimaryKeyCompare(uint32 type) : fType(type) {}
+
+	inline int operator()(const PrimaryKey &a,
+						  const PrimaryKey &b) const
+	{
+		if (a.attribute != NULL && a.attribute == b.attribute)
+			return 0;
+		return compare_keys(a.key, a.length, b.key, b.length, fType);
+	}
+
+	uint32	fType;
+};
+
+// AttributeNodeIterator
+template<typename AttributeIterator>
+class AttributeNodeIterator {
+public:
+	inline Node **GetCurrent()
+	{
+		if (Attribute **attribute = fIterator.GetCurrent()) {
+			fNode = (*attribute)->GetNode();
+			return &fNode;
+		}
+		return NULL;
+	}
+
+	inline Node **GetNext()
+	{
+		if (Attribute **attribute = fIterator.GetNext()) {
+			fNode = (*attribute)->GetNode();
+			return &fNode;
+		}
+		return NULL;
+	}
+
+	AttributeIterator	fIterator;
+	Node				*fNode;
+};
+
+
+// AttributeTree
+class AttributeIndexImpl::AttributeTree
+	: public TwoKeyAVLTree<Attribute*, PrimaryKey, PrimaryKeyCompare,
+						   GetPrimaryKey> {
+public:
+	AttributeTree(uint32 type)
+		: TwoKeyAVLTree<Attribute*, PrimaryKey, PrimaryKeyCompare,
+						GetPrimaryKey>(PrimaryKeyCompare(type),
+		  	GetPrimaryKey(), AVLTreeStandardCompare<Attribute*>(),
+			AVLTreeStandardGetKey<Attribute*, Attribute*>(),
+			AVLTreeStandardNodeAllocator<Attribute*,
+										 AVLTreeStandardNode<Attribute*> >(),
+			AVLTreeStandardGetValue<Attribute*,
+									AVLTreeStandardNode<Attribute*> >())
+	{
+	}
+};
+
+
+// Iterator
+class AttributeIndexImpl::Iterator
+	: public NodeEntryIterator<
+		AttributeNodeIterator<AttributeTree::Iterator> >,
+	  public DLListLinkImpl<Iterator>, public EntryListener,
+	  public NodeListener {
+public:
+	Iterator();
+	virtual ~Iterator();
+
+	virtual Entry *GetCurrent();
+	virtual Entry *GetCurrent(uint8 *buffer, size_t *keyLength);
+
+	virtual status_t Suspend();
+	virtual status_t Resume();
+
+	bool SetTo(AttributeIndexImpl *index, const uint8 *key, size_t length,
+			   bool ignoreValue = false);
+	void Unset();
+
+	virtual void EntryRemoved(Entry *entry);
+	virtual void NodeRemoved(Node *node);
+
+private:
+	typedef NodeEntryIterator<
+		AttributeNodeIterator<AttributeTree::Iterator> > BaseClass;
+
+private:
+	AttributeIndexImpl	*fIndex;
+};
+
+
+// IteratorList
+class AttributeIndexImpl::IteratorList : public DLList<Iterator> {};
+
+
+// AttributeIndexImpl
+
+// constructor
+AttributeIndexImpl::AttributeIndexImpl(Volume *volume, const char *name,
+									   uint32 type, size_t keyLength)
+	: AttributeIndex(volume, name, type, (keyLength > 0), keyLength),
+	  fAttributes(new(nothrow) AttributeTree(type)),
+	  fIterators(new(nothrow) IteratorList)
+{
+	if (fInitStatus == B_OK && (!fAttributes || !fIterators))
+		fInitStatus = B_NO_MEMORY;
+}
+
+// destructor
+AttributeIndexImpl::~AttributeIndexImpl()
+{
+	if (fIterators) {
+		// unset the iterators
+		for (Iterator *iterator = fIterators->GetFirst();
+			 iterator;
+			 iterator = fIterators->GetNext(iterator)) {
+			iterator->SetTo(NULL, NULL, 0);
+		}
+		delete fIterators;
+	}
+	// unset all attributes and delete the tree
+	if (fAttributes) {
+		AttributeTree::Iterator it;
+		fAttributes->GetIterator(&it);
+		for (Attribute **attribute = it.GetCurrent(); attribute; it.GetNext())
+			(*attribute)->SetIndex(NULL, false);
+		delete fAttributes;
+	}
+}
+
+// CountEntries
+int32
+AttributeIndexImpl::CountEntries() const
+{
+	return fAttributes->CountItems();
+}
+
+// Changed
+status_t
+AttributeIndexImpl::Changed(Attribute *attribute, const uint8 *oldKey,
+							size_t oldLength)
+{
+	status_t error = B_BAD_VALUE;
+	if (attribute && attribute->GetIndex() == this) {
+		// update the iterators and remove the attribute from the tree
+		error = B_OK;
+		if (attribute->IsInIndex()) {
+			AttributeTree::Iterator it;
+			Attribute **foundAttribute = fAttributes->Find(
+				PrimaryKey(attribute, oldKey, oldLength), attribute, &it);
+			if (foundAttribute && *foundAttribute == attribute) {
+				Node *node = attribute->GetNode();
+				// update the iterators
+				for (Iterator *iterator = fIterators->GetFirst();
+					 iterator;
+					 iterator = fIterators->GetNext(iterator)) {
+					if (iterator->GetCurrentNode() == node)
+						iterator->NodeRemoved(node);
+				}
+				// remove and re-insert the attribute
+				fAttributes->Remove(it);
+			}
+		}
+		// re-insert the attribute
+		if (fKeyLength > 0 && attribute->GetSize() != fKeyLength) {
+			attribute->SetIndex(this, false);
+		} else {
+			error = fAttributes->Insert(attribute);
+			if (error == B_OK)
+				attribute->SetIndex(this, true);
+			else
+				attribute->SetIndex(NULL, false);
+		}
+	}
+	return error;
+}
+
+// Added
+status_t
+AttributeIndexImpl::Added(Attribute *attribute)
+{
+PRINT(("AttributeIndex::Add(%p)\n", attribute));
+	status_t error = (attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		size_t size = attribute->GetSize();
+		if (fKeyLength > 0 && size != fKeyLength) {
+			attribute->SetIndex(this, false);
+		} else {
+			error = fAttributes->Insert(attribute);
+			if (error == B_OK)
+				attribute->SetIndex(this, true);
+		}
+	}
+	return error;
+}
+
+// Removed
+bool
+AttributeIndexImpl::Removed(Attribute *attribute)
+{
+PRINT(("AttributeIndex::Removed(%p)\n", attribute));
+	bool result = (attribute && attribute->GetIndex() == this);
+	if (result) {
+		if (attribute->IsInIndex())
+			fAttributes->Remove(attribute, attribute);
+		attribute->SetIndex(NULL, false);
+	}
+	return result;
+}
+
+// InternalGetIterator
+AbstractIndexEntryIterator *
+AttributeIndexImpl::InternalGetIterator()
+{
+	Iterator *iterator = new(nothrow) Iterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, NULL, 0, true)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// InternalFind
+AbstractIndexEntryIterator *
+AttributeIndexImpl::InternalFind(const uint8 *key, size_t length)
+{
+	if (!key || (fKeyLength > 0 && length != fKeyLength))
+		return NULL;
+	Iterator *iterator = new(nothrow) Iterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, key, length)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// _AddIterator
+void
+AttributeIndexImpl::_AddIterator(Iterator *iterator)
+{
+	fIterators->Insert(iterator);
+}
+
+// _RemoveIterator
+void
+AttributeIndexImpl::_RemoveIterator(Iterator *iterator)
+{
+	fIterators->Remove(iterator);
+}
+
+
+// Iterator
+
+// constructor
+AttributeIndexImpl::Iterator::Iterator()
+	: BaseClass(),
+	  fIndex(NULL)
+{
+}
+
+// destructor
+AttributeIndexImpl::Iterator::~Iterator()
+{
+	SetTo(NULL, NULL, 0);
+}
+
+// GetCurrent
+Entry *
+AttributeIndexImpl::Iterator::GetCurrent()
+{
+	return BaseClass::GetCurrent();
+}
+
+// GetCurrent
+Entry *
+AttributeIndexImpl::Iterator::GetCurrent(uint8 *buffer, size_t *keyLength)
+{
+	Entry *entry = GetCurrent();
+	if (entry) {
+		if (Attribute **attribute = fIterator.fIterator.GetCurrent()) {
+			if ((*attribute)->GetNode() == entry->GetNode()) {
+				(*attribute)->GetKey(buffer, keyLength);
+			} else {
+				FATAL(("Node of current attribute and node of current entry "
+					   "differ: %Ld vs. %Ld\n",
+					   (*attribute)->GetNode()->GetID(),
+					   entry->GetNode()->GetID()));
+				entry = NULL;
+			}
+		} else {
+			FATAL(("We have a current entry (`%s', node: %Ld), but no current "
+				   "attribute.\n", entry->GetName(),
+				   entry->GetNode()->GetID()));
+			entry = NULL;
+		}
+	}
+	return entry;
+}
+
+// Suspend
+status_t
+AttributeIndexImpl::Iterator::Suspend()
+{
+	status_t error = BaseClass::Suspend();
+	if (error == B_OK) {
+		if (fNode) {
+			error = fIndex->GetVolume()->AddNodeListener(this, fNode,
+														 NODE_LISTEN_REMOVED);
+			if (error == B_OK && fEntry) {
+				error = fIndex->GetVolume()->AddEntryListener(this, fEntry,
+					ENTRY_LISTEN_REMOVED);
+				if (error != B_OK)
+					fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+			}
+			if (error != B_OK)
+				BaseClass::Resume();
+		}
+	}
+	return error;
+}
+
+// Resume
+status_t
+AttributeIndexImpl::Iterator::Resume()
+{
+	status_t error = BaseClass::Resume();
+	if (error == B_OK) {
+		if (fEntry)
+			error = fIndex->GetVolume()->RemoveEntryListener(this, fEntry);
+		if (fNode) {
+			if (error == B_OK)
+				error = fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+			else
+				fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+		}
+	}
+	return error;
+}
+
+// SetTo
+bool
+AttributeIndexImpl::Iterator::SetTo(AttributeIndexImpl *index,
+	const uint8 *key, size_t length, bool ignoreValue)
+{
+	Resume();
+	Unset();
+	// set the new values
+	fIndex = index;
+	if (fIndex)
+		fIndex->_AddIterator(this);
+	fInitialized = fIndex;
+	// get the attribute node's first entry
+	if (fIndex) {
+		// get the first node
+		bool found = true;
+		if (ignoreValue)
+			fIndex->fAttributes->GetIterator(&fIterator.fIterator);
+		else {
+			found = fIndex->fAttributes->FindFirst(PrimaryKey(key, length),
+												   &(fIterator.fIterator));
+		}
+		// get the first entry
+		if (found) {
+			if (Node **nodeP = fIterator.GetCurrent()) {
+				fNode = *nodeP;
+				fEntry = fNode->GetFirstReferrer();
+				if (!fEntry)
+					BaseClass::GetNext();
+				if (Attribute **attribute = fIterator.fIterator.GetCurrent()) {
+					const uint8 *attrKey;
+					size_t attrKeyLength;
+					(*attribute)->GetKey(&attrKey, &attrKeyLength);
+					if (!ignoreValue
+						&& compare_keys(attrKey, attrKeyLength, key, length,
+										fIndex->GetType()) != 0) {
+						Unset();
+					}
+				}
+			}
+		}
+	}
+	return fEntry;
+}
+
+// Unset
+void
+AttributeIndexImpl::Iterator::Unset()
+{
+	if (fIndex) {
+		fIndex->_RemoveIterator(this);
+		fIndex = NULL;
+	}
+	BaseClass::Unset();
+}
+
+// EntryRemoved
+void
+AttributeIndexImpl::Iterator::EntryRemoved(Entry */*entry*/)
+{
+	Resume();
+	fIsNext = BaseClass::GetNext();
+	Suspend();
+}
+
+// NodeRemoved
+void
+AttributeIndexImpl::Iterator::NodeRemoved(Node */*node*/)
+{
+	Resume();
+	fEntry = NULL;
+	fIsNext = BaseClass::GetNext();
+	Suspend();
+}
+

src/add-ons/kernel/file_systems/ramfs/AttributeIndexImpl.h

@@ -0,0 +1,49 @@
+// AttributeIndexImpl.h
+
+#ifndef ATTRIBUTE_INDEX_IMPL_H
+#define ATTRIBUTE_INDEX_IMPL_H
+
+#include "AttributeIndex.h"
+
+// AttributeIndexImpl
+class AttributeIndexImpl : public AttributeIndex {
+public:
+	AttributeIndexImpl(Volume *volume, const char *name, uint32 type,
+					   size_t keyLength);
+	virtual ~AttributeIndexImpl();
+
+	virtual int32 CountEntries() const;
+
+	virtual status_t Changed(Attribute *attribute,
+							 const uint8 *oldKey, size_t oldLength);
+
+private:
+	virtual status_t Added(Attribute *attribute);
+	virtual bool Removed(Attribute *attribute);
+
+protected:
+	virtual AbstractIndexEntryIterator *InternalGetIterator();
+	virtual AbstractIndexEntryIterator *InternalFind(const uint8 *key,
+													 size_t length);
+
+private:
+	class Iterator;
+	class IteratorList;
+	class AttributeTree;
+
+	class PrimaryKey;
+	class GetPrimaryKey;
+	class PrimaryKeyCompare;
+
+	friend class Iterator;
+
+private:
+	void _AddIterator(Iterator *iterator);
+	void _RemoveIterator(Iterator *iterator);
+
+private:
+	AttributeTree	*fAttributes;
+	IteratorList	*fIterators;
+};
+
+#endif	// ATTRIBUTE_INDEX_IMPL_H

src/add-ons/kernel/file_systems/ramfs/AttributeIterator.cpp

@@ -0,0 +1,136 @@
+// AttributeIterator.cpp
+
+#include "AttributeIterator.h"
+#include "Node.h"
+#include "Volume.h"
+
+// constructor
+AttributeIterator::AttributeIterator(Node *node)
+	: fNode(node),
+	  fAttribute(NULL),
+	  fSuspended(false),
+	  fIsNext(false),
+	  fDone(false)
+{
+}
+
+// destructor
+AttributeIterator::~AttributeIterator()
+{
+	Unset();
+}
+
+// SetTo
+status_t
+AttributeIterator::SetTo(Node *node)
+{
+	Unset();
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		fNode = node;
+		fAttribute = NULL;
+		fSuspended = false;
+		fIsNext = false;
+		fDone = false;
+	}
+	return error;
+}
+
+// Unset
+void
+AttributeIterator::Unset()
+{
+	if (fNode && fSuspended)
+		Resume();
+	fNode = NULL;
+	fAttribute = NULL;
+	fSuspended = false;
+	fIsNext = false;
+	fDone = false;
+}
+
+// Suspend
+status_t
+AttributeIterator::Suspend()
+{
+	status_t error = (fNode ? B_OK : B_ERROR);
+	if (error == B_OK) {
+		if (fNode->GetVolume()->IteratorLock()) {
+			if (!fSuspended) {
+				if (fAttribute)
+					fAttribute->AttachAttributeIterator(this);
+				fNode->GetVolume()->IteratorUnlock();
+				fSuspended = true;
+			} else
+				error = B_ERROR;
+		} else
+			error = B_ERROR;
+	}
+	return error;
+}
+
+// Resume
+status_t
+AttributeIterator::Resume()
+{
+	status_t error = (fNode ? B_OK : B_ERROR);
+	if (error == B_OK) {
+		if (fNode->GetVolume()->IteratorLock()) {
+			if (fSuspended) {
+				if (fAttribute)
+					fAttribute->DetachAttributeIterator(this);
+				fSuspended = false;
+			}
+			fNode->GetVolume()->IteratorUnlock();
+		} else
+			error = B_ERROR;
+	}
+	return error;
+}
+
+// GetNext
+status_t
+AttributeIterator::GetNext(Attribute **attribute)
+{
+	status_t error = B_ENTRY_NOT_FOUND;
+	if (!fDone && fNode && attribute) {
+		if (fIsNext) {
+			fIsNext = false;
+			if (fAttribute)
+				error = B_OK;
+		} else
+			error = fNode->GetNextAttribute(&fAttribute);
+		*attribute = fAttribute;
+	}
+	fDone = (error != B_OK);
+	return error;
+}
+
+// Rewind
+status_t
+AttributeIterator::Rewind()
+{
+	status_t error = (fNode ? B_OK : B_ERROR);
+	if (error == B_OK) {
+		if (fNode->GetVolume()->IteratorLock()) {
+			if (fSuspended && fAttribute)
+				fAttribute->DetachAttributeIterator(this);
+			fAttribute = NULL;
+			fIsNext = false;
+			fDone = false;
+			fNode->GetVolume()->IteratorUnlock();
+		} else
+			error = B_ERROR;
+	}
+	return error;
+}
+
+// SetCurrent
+void
+AttributeIterator::SetCurrent(Attribute *attribute, bool isNext)
+{
+	fIsNext = isNext;
+	fAttribute = attribute;
+	fDone = !fAttribute;
+}
+

src/add-ons/kernel/file_systems/ramfs/AttributeIterator.h

@@ -0,0 +1,46 @@
+// AttributeIterator.h
+
+#ifndef ATTRIBUTE_ITERATOR_H
+#define ATTRIBUTE_ITERATOR_H
+
+#include <SupportDefs.h>
+
+#include "DLList.h"
+
+class Attribute;
+class Node;
+
+class AttributeIterator : public DLListLinkImpl<AttributeIterator> {
+public:
+	AttributeIterator(Node *node = NULL);
+	~AttributeIterator();
+
+	status_t SetTo(Node *node);
+	void Unset();
+
+	Node *GetNode() const { return fNode; }
+
+	status_t Suspend();
+	status_t Resume();
+	bool IsSuspended() const { return fSuspended; }
+
+	status_t GetNext(Attribute **attribute);
+	Attribute *GetCurrent() const { return fAttribute; }
+
+	status_t Rewind();
+
+private:
+	void SetCurrent(Attribute *attribute, bool isNext);
+
+private:
+	friend class Node;
+
+private:
+	Node							*fNode;
+	Attribute						*fAttribute;
+	bool							fSuspended;
+	bool							fIsNext;
+	bool							fDone;
+};
+
+#endif	// ATTRIBUTE_ITERATOR_H

src/add-ons/kernel/file_systems/ramfs/Block.h

@@ -0,0 +1,317 @@
+// Block.h
+
+#ifndef BLOCK_H
+#define BLOCK_H
+
+class Block;
+class BlockHeader;
+class BlockReference;
+class TFreeBlock;
+
+#include <SupportDefs.h>
+
+// debugging
+//#define inline
+#define BA_DEFINE_INLINES	1
+
+// BlockHeader
+class BlockHeader {
+public:
+	inline Block *ToBlock()				{ return (Block*)this; }
+	inline TFreeBlock *ToFreeBlock()	{ return (TFreeBlock*)this; }
+
+	inline void SetPreviousBlock(Block *block);
+	inline Block *GetPreviousBlock();
+
+	inline void SetNextBlock(Block *block);
+	inline Block *GetNextBlock();
+	inline bool HasNextBlock()			{ return (fSize & HAS_NEXT_FLAG); }
+
+	inline void SetSize(size_t size, bool hasNext = false);
+	inline size_t GetSize() const;
+	static inline size_t GetUsableSizeFor(size_t size);
+	inline size_t GetUsableSize() const;
+
+	inline void *GetData();
+
+	inline void SetFree(bool flag);
+	inline bool IsFree() const;
+
+	inline void SetReference(BlockReference *ref);
+	inline BlockReference *GetReference() const		{ return fReference; }
+	inline void FixReference();
+
+	inline void SetTo(Block *previous, size_t size, bool isFree, bool hasNext,
+					  BlockReference *reference = NULL);
+
+private:
+	enum {
+		FREE_FLAG		= 0x80000000,
+		BACK_SKIP_MASK	= 0x7fffffff,
+	};
+
+	enum {
+		HAS_NEXT_FLAG	= 0x80000000,
+		SIZE_MASK		= 0x7fffffff,
+	};
+
+private:
+	BlockHeader();
+	~BlockHeader();
+
+protected:
+	size_t			fBackSkip;
+	size_t			fSize;
+	BlockReference	*fReference;
+};
+
+// Block
+class Block : public BlockHeader {
+public:
+	static inline Block *MakeBlock(void *address, ssize_t offset,
+								  Block *previous, size_t size, bool isFree,
+								  bool hasNext,
+								  BlockReference *reference = NULL);
+
+private:
+	Block();
+	~Block();
+};
+
+// TFreeBlock
+class TFreeBlock : public Block {
+public:
+
+	inline void SetPreviousFreeBlock(TFreeBlock *block)	{ fPrevious = block; }
+	inline void SetNextFreeBlock(TFreeBlock *block)		{ fNext = block; }
+	inline TFreeBlock *GetPreviousFreeBlock()			{ return fPrevious; }
+	inline TFreeBlock *GetNextFreeBlock()				{ return fNext; }
+
+	inline void SetTo(Block *previous, size_t size, bool hasNext,
+					  TFreeBlock *previousFree, TFreeBlock *nextFree);
+
+//	static inline TFreeBlock *MakeFreeBlock(void *address, ssize_t offset,
+//		Block *previous, size_t size, bool hasNext, TFreeBlock *previousFree,
+//		TFreeBlock *nextFree);
+
+private:
+	TFreeBlock();
+	~TFreeBlock();
+
+private:
+	TFreeBlock	*fPrevious;
+	TFreeBlock	*fNext;
+};
+
+// BlockReference
+class BlockReference {
+public:
+	inline BlockReference()				: fBlock(NULL) {}
+	inline BlockReference(Block *block) : fBlock(block) {}
+
+	inline void SetBlock(Block *block)	{ fBlock = block; }
+	inline Block *GetBlock() const		{ return fBlock; }
+
+	inline void *GetData() const		{ return fBlock->GetData(); }
+	inline void *GetDataAt(ssize_t offset) const;
+
+private:
+	Block	*fBlock;
+};
+
+
+// ---------------------------------------------------------------------------
+// inline methods
+
+// debugging
+#if BA_DEFINE_INLINES
+
+// BlockHeader
+
+// SetPreviousBlock
+inline
+void
+BlockHeader::SetPreviousBlock(Block *block)
+{
+	size_t offset = (block ? (char*)this - (char*)block : 0);
+	fBackSkip = fBackSkip & FREE_FLAG | offset;
+}
+
+// GetPreviousBlock
+inline
+Block *
+BlockHeader::GetPreviousBlock()
+{
+	if (fBackSkip & BACK_SKIP_MASK)
+		return (Block*)((char*)this - (fBackSkip & BACK_SKIP_MASK));
+	return NULL;
+}
+
+// SetNextBlock
+inline
+void
+BlockHeader::SetNextBlock(Block *block)
+{
+	if (block)
+		fSize = ((char*)block - (char*)this) | HAS_NEXT_FLAG;
+	else
+		fSize &= SIZE_MASK;
+}
+
+// GetNextBlock
+inline
+Block *
+BlockHeader::GetNextBlock()
+{
+	if (fSize & HAS_NEXT_FLAG)
+		return (Block*)((char*)this + (SIZE_MASK & fSize));
+	return NULL;
+}
+
+// SetSize
+inline
+void
+BlockHeader::SetSize(size_t size, bool hasNext)
+{
+	fSize = size;
+	if (hasNext)
+		fSize |= HAS_NEXT_FLAG;
+}
+
+// GetSize
+inline
+size_t
+BlockHeader::GetSize() const
+{
+	return (fSize & SIZE_MASK);
+}
+
+// GetUsableSizeFor
+inline
+size_t
+BlockHeader::GetUsableSizeFor(size_t size)
+{
+	return (size - sizeof(BlockHeader));
+}
+
+// GetUsableSize
+inline
+size_t
+BlockHeader::GetUsableSize() const
+{
+	return GetUsableSizeFor(GetSize());
+}
+
+// GetData
+inline
+void *
+BlockHeader::GetData()
+{
+	return (char*)this + sizeof(BlockHeader);
+}
+
+// SetFree
+inline
+void
+BlockHeader::SetFree(bool flag)
+{
+	if (flag)
+		fBackSkip |= FREE_FLAG;
+	else
+		fBackSkip &= ~FREE_FLAG;
+}
+
+// IsFree
+inline
+bool
+BlockHeader::IsFree() const
+{
+	return (fBackSkip & FREE_FLAG);
+}
+
+// SetTo
+inline
+void
+BlockHeader::SetTo(Block *previous, size_t size, bool isFree, bool hasNext,
+				   BlockReference *reference)
+{
+	SetPreviousBlock(previous);
+	SetSize(size, hasNext);
+	SetFree(isFree);
+	SetReference(reference);
+}
+
+// SetReference
+inline
+void
+BlockHeader::SetReference(BlockReference *ref)
+{
+	fReference = ref;
+	FixReference();
+}
+
+// FixReference
+inline
+void
+BlockHeader::FixReference()
+{
+	if (fReference)
+		fReference->SetBlock(ToBlock());
+}
+
+
+// Block
+
+// MakeBlock
+/*inline
+Block *
+Block::MakeBlock(void *address, ssize_t offset, Block *previous, size_t size,
+				 bool isFree, bool hasNext, BlockReference *reference)
+{
+	Block *block = (Block*)((char*)address + offset);
+	block->SetTo(previous, size, isFree, hasNext, reference);
+	return block;
+}*/
+
+
+// TFreeBlock
+
+// SetTo
+inline
+void
+TFreeBlock::SetTo(Block *previous, size_t size, bool hasNext,
+				  TFreeBlock *previousFree, TFreeBlock *nextFree)
+{
+	Block::SetTo(previous, size, true, hasNext, NULL);
+	SetPreviousFreeBlock(previousFree);
+	SetNextFreeBlock(nextFree);
+}
+
+// MakeFreeBlock
+/*inline
+TFreeBlock *
+TFreeBlock::MakeFreeBlock(void *address, ssize_t offset, Block *previous,
+						  size_t size, bool hasNext, TFreeBlock *previousFree,
+						  TFreeBlock *nextFree)
+{
+	TFreeBlock *block = (TFreeBlock*)((char*)address + offset);
+	block->SetTo(previous, size, hasNext, previousFree, nextFree);
+	if (hasNext)
+		block->GetNextBlock()->SetPreviousBlock(block);
+	return block;
+}*/
+
+
+// BlockReference
+
+// GetDataAt
+inline
+void *
+BlockReference::GetDataAt(ssize_t offset) const
+{
+	return (char*)fBlock->GetData() + offset;
+}
+
+#endif	// BA_DEFINE_INLINES
+
+#endif	// BLOCK_H

src/add-ons/kernel/file_systems/ramfs/BlockAllocator.cpp

@@ -0,0 +1,426 @@
+// BlockAllocator.cpp
+
+// debugging
+#define BA_DEFINE_INLINES	1
+
+#include "AllocationInfo.h"
+#include "BlockAllocator.h"
+#include "BlockAllocatorArea.h"
+#include "BlockAllocatorAreaBucket.h"
+#include "Debug.h"
+#include "DLList.h"
+
+// BlockAllocator
+
+// constructor
+BlockAllocator::BlockAllocator(size_t areaSize)
+	: fReferenceManager(),
+	  fBuckets(NULL),
+	  fBucketCount(0),
+	  fAreaSize(areaSize),
+	  fAreaCount(0),
+	  fFreeBytes(0)
+{
+	// create and init buckets
+	fBucketCount = bucket_containing_size(areaSize) + 1;
+	fBuckets = new(nothrow) AreaBucket[fBucketCount];
+	size_t minSize = 0;
+	for (int32 i = 0; i < fBucketCount; i++) {
+		size_t maxSize = (1 << i) * kMinNetBlockSize;
+		fBuckets[i].SetIndex(i);
+		fBuckets[i].SetSizeLimits(minSize, maxSize);
+		minSize = maxSize;
+	}
+}
+
+// destructor
+BlockAllocator::~BlockAllocator()
+{
+	if (fBuckets)
+		delete[] fBuckets;
+}
+
+// InitCheck
+status_t
+BlockAllocator::InitCheck() const
+{
+	RETURN_ERROR(fBuckets ? B_OK : B_NO_MEMORY);
+}
+
+// AllocateBlock
+BlockReference *
+BlockAllocator::AllocateBlock(size_t usableSize)
+{
+#if ENABLE_BA_PANIC
+if (fPanic)
+	return NULL;
+#endif
+//PRINT(("BlockAllocator::AllocateBlock(%lu)\n", usableSize));
+	Block *block = NULL;
+	if (usableSize > 0 && usableSize <= Area::GetMaxFreeBytesFor(fAreaSize)) {
+		// get a block reference
+		BlockReference *reference = fReferenceManager.AllocateReference();
+		if (reference) {
+			block = _AllocateBlock(usableSize);
+			// set reference / cleanup on failure
+			if (block)
+				block->SetReference(reference);
+			else
+				fReferenceManager.FreeReference(reference);
+		}
+		D(SanityCheck(false));
+	}
+//PRINT(("BlockAllocator::AllocateBlock() done: %p\n", block));
+	return (block ? block->GetReference() : NULL);
+}
+
+// FreeBlock
+void
+BlockAllocator::FreeBlock(BlockReference *blockReference)
+{
+#if ENABLE_BA_PANIC
+if (fPanic)
+	return;
+#endif
+D(if (!CheckBlock(blockReference)) return;);
+	Block *block = (blockReference ? blockReference->GetBlock() : NULL);
+//PRINT(("BlockAllocator::FreeBlock(%p)\n", block));
+	Area *area = NULL;
+	if (block && !block->IsFree() && (area = _AreaForBlock(block)) != NULL) {
+		_FreeBlock(area, block, true);
+		D(SanityCheck(false));
+		if (_DefragmentingRecommended())
+			_Defragment();
+	}
+//PRINT(("BlockAllocator::FreeBlock() done\n"));
+}
+
+// ResizeBlock
+BlockReference *
+BlockAllocator::ResizeBlock(BlockReference *blockReference, size_t usableSize)
+{
+#if ENABLE_BA_PANIC
+if (fPanic)
+	return NULL;
+#endif
+D(if (!CheckBlock(blockReference)) return NULL;);
+//PRINT(("BlockAllocator::ResizeBlock(%p, %lu)\n", blockReference, usableSize));
+	Block *block = (blockReference ? blockReference->GetBlock() : NULL);
+	Block *resultBlock = NULL;
+	Area *area = NULL;
+	if (block && !block->IsFree() && (area = _AreaForBlock(block)) != NULL) {
+//PRINT(("BlockAllocator::ResizeBlock(%p, %lu)\n", block, usableSize));
+		if (usableSize) {
+			// try to let the area resize the block
+			size_t blockSize = block->GetSize();
+			size_t areaFreeBytes = area->GetFreeBytes();
+			bool needsDefragmenting = area->NeedsDefragmenting();
+//PRINT(("  block reference: %p / %p\n", blockReference, block->GetReference()));
+			resultBlock = area->ResizeBlock(block, usableSize);
+			block = blockReference->GetBlock();
+			if (resultBlock) {
+//PRINT(("  area succeeded in resizing the block\n"));
+//PRINT(("  block reference now: %p\n", resultBlock->GetReference()));
+				// the area was able to resize the block
+				_RethinkAreaBucket(area, area->GetBucket(),
+								   needsDefragmenting);
+				fFreeBytes = fFreeBytes + area->GetFreeBytes() - areaFreeBytes;
+				// Defragment only, if the area was able to resize the block,
+				// the new block is smaller than the old one and defragmenting
+				// is recommended.
+				if (blockSize > resultBlock->GetSize()
+					&& _DefragmentingRecommended()) {
+					_Defragment();
+				}
+			} else {
+//PRINT(("  area failed to resize the block\n"));
+				// the area failed: allocate a new block, copy the data, and
+				// free the old one
+				resultBlock = _AllocateBlock(usableSize);
+				block = blockReference->GetBlock();
+				if (resultBlock) {
+					memcpy(resultBlock->GetData(), block->GetData(),
+						   block->GetUsableSize());
+					resultBlock->SetReference(block->GetReference());
+					_FreeBlock(area, block, false);
+				}
+			}
+		} else
+			FreeBlock(blockReference);
+		D(SanityCheck(false));
+//PRINT(("BlockAllocator::ResizeBlock() done: %p\n", resultBlock));
+	}
+	return (resultBlock ? resultBlock->GetReference() : NULL);
+}
+
+// SanityCheck
+bool
+BlockAllocator::SanityCheck(bool deep) const
+{
+	// iterate through all areas of all buckets
+	int32 areaCount = 0;
+	size_t freeBytes = 0;
+	for (int32 i = 0; i < fBucketCount; i++) {
+		AreaBucket *bucket = fBuckets + i;
+		if (deep) {
+			if (!bucket->SanityCheck(deep))
+				return false;
+		}
+		for (Area *area = bucket->GetFirstArea();
+			 area;
+			 area = bucket->GetNextArea(area)) {
+			areaCount++;
+			freeBytes += area->GetFreeBytes();
+		}
+	}
+	// area count
+	if (areaCount != fAreaCount) {
+		FATAL(("fAreaCount is %ld, but should be %ld\n", fAreaCount,
+			   areaCount));
+		BA_PANIC("BlockAllocator: Bad free bytes.");
+		return false;
+	}
+	// free bytes
+	if (fFreeBytes != freeBytes) {
+		FATAL(("fFreeBytes is %lu, but should be %lu\n", fFreeBytes,
+			   freeBytes));
+		BA_PANIC("BlockAllocator: Bad free bytes.");
+		return false;
+	}
+	return true;
+}
+
+// CheckArea
+bool
+BlockAllocator::CheckArea(Area *checkArea)
+{
+	for (int32 i = 0; i < fBucketCount; i++) {
+		AreaBucket *bucket = fBuckets + i;
+		for (Area *area = bucket->GetFirstArea();
+			 area;
+			 area = bucket->GetNextArea(area)) {
+			if (area == checkArea)
+				return true;
+		}
+	}
+	FATAL(("Area %p is not a valid Area!\n", checkArea));
+	BA_PANIC("Invalid Area.");
+	return false;
+}
+
+// CheckBlock
+bool
+BlockAllocator::CheckBlock(Block *block, size_t minSize)
+{
+	Area *area = _AreaForBlock(block);
+	return (area/* && CheckArea(area)*/ && area->CheckBlock(block, minSize));
+}
+
+// CheckBlock
+bool
+BlockAllocator::CheckBlock(BlockReference *reference, size_t minSize)
+{
+	return (fReferenceManager.CheckReference(reference)
+			&& CheckBlock(reference->GetBlock(), minSize));
+}
+
+// GetAllocationInfo
+void
+BlockAllocator::GetAllocationInfo(AllocationInfo &info)
+{
+	fReferenceManager.GetAllocationInfo(info);
+	info.AddOtherAllocation(sizeof(AreaBucket), fBucketCount);
+	info.AddAreaAllocation(fAreaSize, fAreaCount);
+}
+
+// _AreaForBlock
+inline
+BlockAllocator::Area *
+BlockAllocator::_AreaForBlock(Block *block)
+{
+	Area *area = NULL;
+	area_id id = area_for(block);
+	area_info info;
+	if (id >= 0 && get_area_info(id, &info) == B_OK)
+		area = (Area*)info.address;
+D(if (!CheckArea(area)) return NULL;);
+	return area;
+}
+
+// _AllocateBlock
+Block *
+BlockAllocator::_AllocateBlock(size_t usableSize, bool dontCreateArea)
+{
+	Block *block = NULL;
+	// Get the last area (the one with the most free space) and try
+	// to let it allocate a block. If that fails, allocate a new area.
+	// find a bucket for the allocation
+// TODO: optimize
+	AreaBucket *bucket = NULL;
+	int32 index = bucket_containing_min_size(usableSize);
+	for (; index < fBucketCount; index++) {
+		if (!fBuckets[index].IsEmpty()) {
+			bucket = fBuckets + index;
+			break;
+		}
+	}
+	// get an area: if we have one, from the bucket, else create a new
+	// area
+	Area *area = NULL;
+	if (bucket)
+		area = bucket->GetFirstArea();
+	else if (!dontCreateArea) {
+		area = Area::Create(fAreaSize);
+		if (area) {
+			fAreaCount++;
+			fFreeBytes += area->GetFreeBytes();
+			bucket = fBuckets + area->GetBucketIndex();
+			bucket->AddArea(area);
+PRINT(("New area allocated. area count now: %ld, free bytes: %lu\n",
+fAreaCount, fFreeBytes));
+		}
+	}
+	// allocate a block
+	if (area) {
+		size_t areaFreeBytes = area->GetFreeBytes();
+		bool needsDefragmenting = area->NeedsDefragmenting();
+		block = area->AllocateBlock(usableSize);
+		// move the area into another bucket, if necessary
+		if (block) {
+			_RethinkAreaBucket(area, bucket, needsDefragmenting);
+			fFreeBytes = fFreeBytes + area->GetFreeBytes() - areaFreeBytes;
+		}
+#if ENABLE_BA_PANIC
+else if (!fPanic) {
+FATAL(("Block allocation failed unexpectedly.\n"));
+PRINT(("  usableSize: %lu, areaFreeBytes: %lu\n", usableSize, areaFreeBytes));
+BA_PANIC("Block allocation failed unexpectedly.");
+//block = area->AllocateBlock(usableSize);
+}
+#endif
+	}
+	return block;
+}
+
+// _FreeBlock
+void
+BlockAllocator::_FreeBlock(Area *area, Block *block, bool freeReference)
+{
+	size_t areaFreeBytes = area->GetFreeBytes();
+	AreaBucket *bucket = area->GetBucket();
+	bool needsDefragmenting = area->NeedsDefragmenting();
+	// free the block and the block reference
+	BlockReference *reference = block->GetReference();
+	area->FreeBlock(block);
+	if (reference && freeReference)
+		fReferenceManager.FreeReference(reference);
+	// move the area into another bucket, if necessary
+	_RethinkAreaBucket(area, bucket, needsDefragmenting);
+	fFreeBytes = fFreeBytes + area->GetFreeBytes() - areaFreeBytes;
+}
+
+// _RethinkAreaBucket
+inline
+void
+BlockAllocator::_RethinkAreaBucket(Area *area, AreaBucket *bucket,
+								   bool needsDefragmenting)
+{
+	AreaBucket *newBucket = fBuckets + area->GetBucketIndex();
+	if (newBucket != bucket
+		|| needsDefragmenting != area->NeedsDefragmenting()) {
+		bucket->RemoveArea(area);
+		newBucket->AddArea(area);
+	}
+}
+
+// _DefragmentingRecommended
+inline
+bool
+BlockAllocator::_DefragmentingRecommended()
+{
+	// Don't know, whether this makes much sense: We don't try to defragment,
+	// when not at least a complete area could be deleted, and some tolerance
+	// being left (a fixed value plus 1/32 of the used bytes).
+	size_t usedBytes = fAreaCount * Area::GetMaxFreeBytesFor(fAreaSize)
+					   - fFreeBytes;
+	return (fFreeBytes > fAreaSize + kDefragmentingTolerance + usedBytes / 32);
+}
+
+// _Defragment
+bool
+BlockAllocator::_Defragment()
+{
+	bool success = false;
+	// We try to empty the least populated area by moving its blocks to other
+	// areas.
+	if (fFreeBytes > fAreaSize) {
+		// find the least populated area
+		// find the bucket with the least populated areas
+		AreaBucket *bucket = NULL;
+		for (int32 i = fBucketCount - 1; i >= 0; i--) {
+			if (!fBuckets[i].IsEmpty()) {
+				bucket = fBuckets + i;
+				break;
+			}
+		}
+		// find the area in the bucket
+		Area *area = NULL;
+		if (bucket) {
+			area = bucket->GetFirstArea();
+			Area *bucketArea = area;
+			while ((bucketArea = bucket->GetNextArea(bucketArea)) != NULL) {
+				if (bucketArea->GetFreeBytes() > area->GetFreeBytes())
+					area = bucketArea;
+			}
+		}
+		if (area) {
+			// remove the area from the bucket
+			bucket->RemoveArea(area);
+			fFreeBytes -= area->GetFreeBytes();
+			// iterate through the blocks in the area and try to find a new
+			// home for them
+			success = true;
+			while (Block *block = area->GetFirstUsedBlock()) {
+				Block *newBlock = _AllocateBlock(block->GetUsableSize(), true);
+				if (newBlock) {
+					// got a new block: copy the data to it and free the old
+					// one
+					memcpy(newBlock->GetData(), block->GetData(),
+						   block->GetUsableSize());
+					newBlock->SetReference(block->GetReference());
+					block->SetReference(NULL);
+					area->FreeBlock(block, true);
+#if ENABLE_BA_PANIC
+					if (fPanic) {
+						PRINT(("Panicked while trying to free block %p\n",
+							   block));
+						success = false;
+						break;
+					}
+#endif
+				} else {
+					success = false;
+					break;
+				}
+			}
+			// delete the area
+			if (success && area->IsEmpty()) {
+				area->Delete();
+				fAreaCount--;
+PRINT(("defragmenting: area deleted\n"));
+			} else {
+PRINT(("defragmenting: failed to empty area\n"));
+				// failed: re-add the area
+				fFreeBytes += area->GetFreeBytes();
+				AreaBucket *newBucket = fBuckets + area->GetBucketIndex();
+				newBucket->AddArea(area);
+			}
+		}
+		D(SanityCheck(false));
+	}
+	return success;
+}
+
+#if ENABLE_BA_PANIC
+bool BlockAllocator::fPanic = false;
+#endif

src/add-ons/kernel/file_systems/ramfs/BlockAllocator.h

@@ -0,0 +1,70 @@
+// BlockAllocator.h
+
+#ifndef BLOCK_ALLOCATOR_H
+#define BLOCK_ALLOCATOR_H
+
+#include <OS.h>
+
+#include "Block.h"
+#include "BlockReferenceManager.h"
+#include "Debug.h"
+#include "List.h"
+
+#define ENABLE_BA_PANIC	1
+#if ENABLE_BA_PANIC
+#define BA_PANIC(x)	{ PANIC(x); BlockAllocator::fPanic = true; }
+#endif
+
+class AllocationInfo;
+
+// BlockAllocator
+class BlockAllocator {
+public:
+	BlockAllocator(size_t areaSize);
+	~BlockAllocator();
+
+	status_t InitCheck() const;
+
+	BlockReference *AllocateBlock(size_t usableSize);
+	void FreeBlock(BlockReference *block);
+	BlockReference *ResizeBlock(BlockReference *block, size_t usableSize);
+
+	size_t GetAvailableBytes() const	{ return fAreaCount * fAreaSize; }
+	size_t GetFreeBytes() const			{ return fFreeBytes; }
+	size_t GetUsedBytes() const			{ return fAreaCount * fAreaSize
+												 - fFreeBytes; }
+
+public:
+	class Area;
+	class AreaBucket;
+
+	// debugging only
+	bool SanityCheck(bool deep = false) const;
+	bool CheckArea(Area *area);
+	bool CheckBlock(Block *block, size_t minSize = 0);
+	bool CheckBlock(BlockReference *reference, size_t minSize = 0);
+	void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	inline Area *_AreaForBlock(Block *block);
+	Block *_AllocateBlock(size_t usableSize, bool dontCreateArea = false);
+	void _FreeBlock(Area *area, Block *block, bool freeReference);
+	inline void _RethinkAreaBucket(Area *area, AreaBucket *bucket,
+								   bool needsDefragmenting);
+	inline bool _DefragmentingRecommended();
+	bool _Defragment();
+
+private:
+	BlockReferenceManager		fReferenceManager;
+	AreaBucket					*fBuckets;
+	int32						fBucketCount;
+	size_t						fAreaSize;
+	int32						fAreaCount;
+	size_t						fFreeBytes;
+#if ENABLE_BA_PANIC
+public:
+	static bool					fPanic;
+#endif
+};
+
+#endif	// BLOCK_ALLOCATOR_H

src/add-ons/kernel/file_systems/ramfs/BlockAllocatorArea.cpp

@@ -0,0 +1,596 @@
+// BlockAllocatorArea.cpp
+
+#include "BlockAllocatorArea.h"
+#include "Debug.h"
+
+// constructor
+BlockAllocator::Area::Area(area_id id, size_t size)
+	: fBucket(NULL),
+	  fID(id),
+	  fSize(size),
+	  fFreeBytes(0),
+	  fFreeBlockCount(1),
+	  fUsedBlockCount(0),
+	  fFirstBlock(NULL),
+	  fLastBlock(NULL),
+	  fFirstFree(NULL),
+	  fLastFree(NULL)
+{
+	size_t headerSize = block_align_ceil(sizeof(Area));
+	fFirstFree = (TFreeBlock*)((char*)this + headerSize);
+	fFirstFree->SetTo(NULL, block_align_floor(fSize - headerSize), false, NULL,
+					  NULL);
+	fFirstBlock = fLastBlock = fLastFree = fFirstFree;
+	fFreeBytes = fFirstFree->GetUsableSize();
+}
+
+// Create
+BlockAllocator::Area *
+BlockAllocator::Area::Create(size_t size)
+{
+	Area *area = NULL;
+	void *base = NULL;
+#if USER
+	area_id id = create_area("block alloc", &base, B_ANY_ADDRESS,
+							 size, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA);
+#else
+	area_id id = create_area("block alloc", &base, B_ANY_KERNEL_ADDRESS,
+							 size, B_FULL_LOCK, B_READ_AREA | B_WRITE_AREA);
+#endif
+	if (id >= 0) {
+		area = new(base) Area(id, size);
+	} else {
+		ERROR(("BlockAllocator::Area::Create(%lu): Failed to create area: %s\n",
+			size, strerror(id)));
+	}
+	return area;
+}
+
+// Delete
+void
+BlockAllocator::Area::Delete()
+{
+	delete_area(fID);
+}
+
+// AllocateBlock
+Block *
+BlockAllocator::Area::AllocateBlock(size_t usableSize, bool dontDefragment)
+{
+if (kMinBlockSize != block_align_ceil(sizeof(TFreeBlock))) {
+FATAL(("kMinBlockSize is not correctly initialized! Is %lu, but should be: "
+"%lu\n", kMinBlockSize, block_align_ceil(sizeof(TFreeBlock))));
+BA_PANIC("kMinBlockSize not correctly initialized.");
+return NULL;
+}
+	if (usableSize == 0)
+		return NULL;
+	Block *newBlock = NULL;
+	size_t size = max(usableSize + sizeof(BlockHeader), kMinBlockSize);
+	size = block_align_ceil(size);
+	if (size <= _GetBlockFreeBytes()) {
+		// find first fit
+		TFreeBlock *block = _FindFreeBlock(size);
+		if (!block && !dontDefragment) {
+			// defragmenting is necessary
+			_Defragment();
+			block = _FindFreeBlock(size);
+			if (!block) {
+				// no free block
+				// Our data structures seem to be corrupted, since
+				// _GetBlockFreeBytes() promised that we would have enough
+				// free space.
+				FATAL(("Couldn't find free block of min size %lu after "
+					   "defragmenting, although we should have %lu usable free "
+					   "bytes!\n", size, _GetBlockFreeBytes()));
+				BA_PANIC("Bad area free bytes.");
+			}
+		}
+		if (block) {
+			// found a free block
+			size_t remainder = block->GetSize() - size;
+			if (remainder >= kMinBlockSize) {
+				// enough space left for a free block
+				Block *freePrev = block->GetPreviousBlock();
+//				TFreeBlock *prevFree = block->GetPreviousFreeBlock();
+//				TFreeBlock *nextFree = block->GetNextFreeBlock();
+//				newBlock = block;
+				_MoveResizeFreeBlock(block, size, remainder);
+				// setup the new block
+//				newBlock->SetSize(size, true);
+//				newBlock->SetFree(false);
+				newBlock = _MakeUsedBlock(block, 0, freePrev, size, true);
+			} else {
+				// not enough space left: take the free block over completely
+				// remove the block from the free list
+				_RemoveFreeBlock(block);
+				newBlock = block;
+				newBlock->SetFree(false);
+			}
+			if (fFreeBlockCount)
+				fFreeBytes -= newBlock->GetSize();
+			else
+				fFreeBytes = 0;
+			fUsedBlockCount++;
+		}
+	}
+	D(SanityCheck());
+	return newBlock;
+}
+
+// FreeBlock
+void
+BlockAllocator::Area::FreeBlock(Block *block, bool dontDefragment)
+{
+	if (block) {
+		// mark the block free and insert it into the free list
+		block->SetFree(true);
+		TFreeBlock *freeBlock = (TFreeBlock*)block;
+		_InsertFreeBlock(freeBlock);
+		fUsedBlockCount--;
+		if (fFreeBlockCount == 1)
+			fFreeBytes += freeBlock->GetUsableSize();
+		else
+			fFreeBytes += freeBlock->GetSize();
+		// try coalescing with the next and the previous free block
+D(SanityCheck());
+		_CoalesceWithNext(freeBlock);
+D(SanityCheck());
+		_CoalesceWithNext(freeBlock->GetPreviousFreeBlock());
+		// defragment, if sensible
+		if (!dontDefragment && _DefragmentingRecommended())
+			_Defragment();
+		D(SanityCheck());
+	}
+}
+
+// ResizeBlock
+Block *
+BlockAllocator::Area::ResizeBlock(Block *block, size_t newUsableSize,
+								  bool dontDefragment)
+{
+//PRINT(("Area::ResizeBlock(%p, %lu)\n", block, newUsableSize));
+// newUsableSize must be >0 !
+	if (newUsableSize == 0)
+		return NULL;
+	Block *resultBlock = NULL;
+	if (block) {
+		size_t size = block->GetSize();
+		size_t newSize = max(newUsableSize + sizeof(BlockHeader),
+							 kMinBlockSize);
+		newSize = block_align_ceil(newSize);
+		if (newSize == size) {
+			// size doesn't change: nothing to do
+			resultBlock = block;
+		} else if (newSize < size) {
+			// shrink the block
+			size_t sizeDiff = size - newSize;
+			Block *nextBlock = block->GetNextBlock();
+			if (nextBlock && nextBlock->IsFree()) {
+				// join the space with the adjoining free block
+				TFreeBlock *freeBlock = nextBlock->ToFreeBlock();
+				_MoveResizeFreeBlock(freeBlock, -sizeDiff,
+									 freeBlock->GetSize() + sizeDiff);
+				// resize the block and we're done
+				block->SetSize(newSize, true);
+				fFreeBytes += sizeDiff;
+			} else if (sizeDiff >= sizeof(TFreeBlock)) {
+				// the freed space is large enough for a free block
+				TFreeBlock *newFree = _MakeFreeBlock(block, newSize, block,
+					sizeDiff, nextBlock, NULL, NULL);
+				_InsertFreeBlock(newFree);
+				block->SetSize(newSize, true);
+				if (fFreeBlockCount == 1)
+					fFreeBytes += newFree->GetUsableSize();
+				else
+					fFreeBytes += newFree->GetSize();
+				if (!dontDefragment && _DefragmentingRecommended())
+					_Defragment();
+			}	// else: insufficient space for a free block: no changes
+			resultBlock = block;
+		} else {
+//PRINT(("  grow...\n"));
+			// grow the block
+			size_t sizeDiff = newSize - size;
+			Block *nextBlock = block->GetNextBlock();
+			if (nextBlock && nextBlock->IsFree()
+				&& nextBlock->GetSize() >= sizeDiff) {
+//PRINT(("  adjoining free block\n"));
+				// there is a adjoining free block and it is large enough
+				TFreeBlock *freeBlock = nextBlock->ToFreeBlock();
+				size_t freeSize = freeBlock->GetSize();
+				if (freeSize - sizeDiff >= sizeof(TFreeBlock)) {
+					// the remaining space is still large enough for a free
+					// block
+					_MoveResizeFreeBlock(freeBlock, sizeDiff,
+										 freeSize - sizeDiff);
+					block->SetSize(newSize, true);
+					fFreeBytes -= sizeDiff;
+				} else {
+					// the remaining free space wouldn't be large enough for
+					// a free block: consume the free block completely
+					Block *freeNext = freeBlock->GetNextBlock();
+					_RemoveFreeBlock(freeBlock);
+					block->SetSize(size + freeSize, freeNext);
+					_FixBlockList(block, block->GetPreviousBlock(), freeNext);
+					if (fFreeBlockCount == 0)
+						fFreeBytes = 0;
+					else
+						fFreeBytes -= freeSize;
+				}
+				resultBlock = block;
+			} else {
+//PRINT(("  no adjoining free block\n"));
+				// no (large enough) adjoining free block: allocate
+				// a new block and copy the data to it
+				BlockReference *reference = block->GetReference();
+				resultBlock = AllocateBlock(newUsableSize, dontDefragment);
+				block = reference->GetBlock();
+				if (resultBlock) {
+					resultBlock->SetReference(reference);
+					memcpy(resultBlock->GetData(), block->GetData(),
+						   block->GetUsableSize());
+					FreeBlock(block, dontDefragment);
+					resultBlock = reference->GetBlock();
+				}
+			}
+		}
+	}
+	D(SanityCheck());
+//PRINT(("Area::ResizeBlock() done: %p\n", resultBlock));
+	return resultBlock;
+}
+
+// SanityCheck
+bool
+BlockAllocator::Area::SanityCheck() const
+{
+	// area ID
+	if (fID < 0) {
+		FATAL(("Area ID < 0: %lx\n", fID));
+		BA_PANIC("Bad area ID.");
+		return false;
+	}
+	// size
+	size_t areaHeaderSize = block_align_ceil(sizeof(Area));
+	if (fSize < areaHeaderSize + sizeof(TFreeBlock)) {
+		FATAL(("Area too small to contain area header and at least one free "
+			   "block: %lu bytes\n", fSize));
+		BA_PANIC("Bad area size.");
+		return false;
+	}
+	// free bytes
+	if (fFreeBytes > fSize) {
+		FATAL(("Free size greater than area size: %lu vs %lu\n", fFreeBytes,
+			   fSize));
+		BA_PANIC("Bad area free bytes.");
+		return false;
+	}
+	// block count
+	if (fFreeBlockCount + fUsedBlockCount == 0) {
+		FATAL(("Area contains no blocks at all.\n"));
+		BA_PANIC("Bad area block count.");
+		return false;
+	}
+	// block list
+	uint32 usedBlockCount = 0;
+	uint32 freeBlockCount = 0;
+	size_t freeBytes = 0;
+	if (!fFirstBlock || !fLastBlock) {
+		FATAL(("Invalid block list: first or last block NULL: first: %p, "
+			   "last: %p\n", fFirstBlock, fLastBlock));
+		BA_PANIC("Bad area block list.");
+		return false;
+	} else {
+		// iterate through block list and also check free list
+		int32 blockCount = fFreeBlockCount + fUsedBlockCount;
+		Block *block = fFirstBlock;
+		Block *prevBlock = NULL;
+		Block *prevFree = NULL;
+		Block *nextFree = fFirstFree;
+		bool blockListOK = true;
+		for (int32 i = 0; i < blockCount; i++) {
+			blockListOK = false;
+			if (!block) {
+				FATAL(("Encountered NULL in block list at index %ld, although "
+					   "list should have %ld blocks\n", i, blockCount));
+				BA_PANIC("Bad area block list.");
+				return false;
+			}
+			uint64 address = (uint32)block;
+			// block within area?
+			if (address < (uint32)this + areaHeaderSize
+				|| address + sizeof(TFreeBlock) > (uint32)this + fSize) {
+				FATAL(("Utterly mislocated block: %p, area: %p, "
+					   "size: %lu\n", block, this, fSize));
+				BA_PANIC("Bad area block.");
+				return false;
+			}
+			// block too large for area?
+			size_t blockSize = block->GetSize();
+			if (blockSize < sizeof(TFreeBlock)
+				|| address + blockSize > (uint32)this + fSize) {
+				FATAL(("Mislocated block: %p, size: %lu, area: %p, "
+					   "size: %lu\n", block, blockSize, this, fSize));
+				BA_PANIC("Bad area block.");
+				return false;
+			}
+			// alignment
+			if (block_align_floor(address) != address
+				|| block_align_floor(blockSize) != blockSize) {
+				FATAL(("Block %ld not properly aligned: %p, size: %lu\n",
+					   i, block, blockSize));
+				BA_PANIC("Bad area block.");
+				return false;
+			}
+			// previous block
+			if (block->GetPreviousBlock() != prevBlock) {
+				FATAL(("Previous block of block %ld was not the previous "
+					   "block in list: %p vs %p\n", i,
+					   block->GetPreviousBlock(), prevBlock));
+				BA_PANIC("Bad area block list.");
+				return false;
+			}
+			// additional checks for free block list
+			if (block->IsFree()) {
+				freeBlockCount++;
+				TFreeBlock *freeBlock = block->ToFreeBlock();
+				if (prevFree)
+					freeBytes += freeBlock->GetSize();
+				else
+					freeBytes += freeBlock->GetUsableSize();
+				// block == next free block of previous free block
+				if (freeBlock != nextFree) {
+					FATAL(("Free block %ld is not the next block in free "
+						   "list: %p vs %p\n", i, freeBlock, nextFree));
+					BA_PANIC("Bad area free list.");
+					return false;
+				}
+				// previous free block
+				if (freeBlock->GetPreviousFreeBlock() != prevFree) {
+					FATAL(("Previous free block of block %ld was not the "
+						   " previous block in free list: %p vs %p\n", i,
+						   freeBlock->GetPreviousFreeBlock(), prevFree));
+					BA_PANIC("Bad area free list.");
+					return false;
+				}
+				prevFree = freeBlock;
+				nextFree = freeBlock->GetNextFreeBlock();
+			} else
+				usedBlockCount++;
+			prevBlock = block;
+			block = block->GetNextBlock();
+			blockListOK = true;
+		}
+		// final checks on block list
+		if (blockListOK) {
+			if (block) {
+				FATAL(("More blocks in block list than expected\n"));
+				BA_PANIC("Bad area block count.");
+				return false;
+			} else if (fLastBlock != prevBlock) {
+				FATAL(("last block in block list was %p, but should be "
+					   "%p\n", fLastBlock, prevBlock));
+				BA_PANIC("Bad area last block.");
+				return false;
+			} else if (prevFree != fLastFree) {
+				FATAL(("last block in free list was %p, but should be %p\n",
+					   fLastFree, prevFree));
+				BA_PANIC("Bad area last free block.");
+				return false;
+			}
+			// block counts (a bit reduntant)
+			if (freeBlockCount != fFreeBlockCount) {
+				FATAL(("Free block count is %ld, but should be %ld\n",
+					   fFreeBlockCount, freeBlockCount));
+				BA_PANIC("Bad area free block count.");
+				return false;
+			}
+			if (usedBlockCount != fUsedBlockCount) {
+				FATAL(("Used block count is %ld, but should be %ld\n",
+					   fUsedBlockCount, usedBlockCount));
+				BA_PANIC("Bad area used block count.");
+				return false;
+			}
+			// free bytes
+			if (fFreeBytes != freeBytes) {
+				FATAL(("Free bytes is %lu, but should be %lu\n",
+					   fFreeBytes, freeBytes));
+				BA_PANIC("Bad area free bytes.");
+				return false;
+			}
+		}
+	}
+	return true;
+}
+
+// CheckBlock
+bool
+BlockAllocator::Area::CheckBlock(Block *checkBlock, size_t minSize)
+{
+	for (Block *block = fFirstBlock; block; block = block->GetNextBlock()) {
+		if (block == checkBlock)
+			return (block->GetUsableSize() >= minSize);
+	}
+	FATAL(("Block %p is not in area %p!\n", checkBlock, this));
+	BA_PANIC("Invalid Block.");
+	return false;
+}
+
+// _FindFreeBlock
+TFreeBlock *
+BlockAllocator::Area::_FindFreeBlock(size_t minSize)
+{
+	// first fit
+	for (TFreeBlock *block = GetFirstFreeBlock();
+		 block;
+		 block = block->GetNextFreeBlock()) {
+		if (block->GetSize() >= minSize)
+			return block;
+	}
+	return NULL;
+}
+
+// _InsertFreeBlock
+void
+BlockAllocator::Area::_InsertFreeBlock(TFreeBlock *block)
+{
+	if (block) {
+		// find the free block before which this one has to be inserted
+		TFreeBlock *nextFree = NULL;
+		for (nextFree = GetFirstFreeBlock();
+			 nextFree;
+			 nextFree = nextFree->GetNextFreeBlock()) {
+			if ((uint32)nextFree > (uint32)block)
+				break;
+		}
+		// get the previous block and insert the block between the two
+		TFreeBlock *prevFree
+			= (nextFree ? nextFree->GetPreviousFreeBlock() : fLastFree);
+		_FixFreeList(block, prevFree, nextFree);
+		fFreeBlockCount++;
+	}
+}
+
+// _RemoveFreeBlock
+void
+BlockAllocator::Area::_RemoveFreeBlock(TFreeBlock *block)
+{
+	if (block) {
+		TFreeBlock *prevFree = block->GetPreviousFreeBlock();
+		TFreeBlock *nextFree = block->GetNextFreeBlock();
+		if (prevFree)
+			prevFree->SetNextFreeBlock(nextFree);
+		else
+			fFirstFree = nextFree;
+		if (nextFree)
+			nextFree->SetPreviousFreeBlock(prevFree);
+		else
+			fLastFree = prevFree;
+	}
+	fFreeBlockCount--;
+}
+
+// _MoveResizeFreeBlock
+TFreeBlock *
+BlockAllocator::Area::_MoveResizeFreeBlock(TFreeBlock *freeBlock,
+										   ssize_t offset, size_t newSize)
+{
+	TFreeBlock *movedFree = NULL;
+	if (freeBlock && offset) {
+		// move the header of the free block
+		Block *freePrev = freeBlock->GetPreviousBlock();
+		TFreeBlock *prevFree = freeBlock->GetPreviousFreeBlock();
+		TFreeBlock *nextFree = freeBlock->GetNextFreeBlock();
+		movedFree = _MakeFreeBlock(freeBlock, offset, freePrev, newSize,
+			freeBlock->HasNextBlock(), prevFree, nextFree);
+		// update the free list
+		_FixFreeList(movedFree, prevFree, nextFree);
+	}
+	return movedFree;
+}
+
+// _MakeFreeBlock
+inline
+TFreeBlock *
+BlockAllocator::Area::_MakeFreeBlock(void *address, ssize_t offset,
+									 Block *previous, size_t size,
+									 bool hasNext, TFreeBlock *previousFree,
+									 TFreeBlock *nextFree)
+{
+	TFreeBlock *block = (TFreeBlock*)((char*)address + offset);
+	block->SetTo(previous, size, hasNext, previousFree, nextFree);
+	if (hasNext)
+		block->GetNextBlock()->SetPreviousBlock(block);
+	else
+		fLastBlock = block;
+	return block;
+}
+
+// _CoalesceWithNext
+bool
+BlockAllocator::Area::_CoalesceWithNext(TFreeBlock *block)
+{
+	bool result = false;
+	TFreeBlock *nextFree = NULL;
+	if (block && (nextFree = block->GetNextFreeBlock()) != NULL
+		&& block->GetNextBlock() == nextFree) {
+		_RemoveFreeBlock(nextFree);
+		Block *nextBlock = nextFree->GetNextBlock();
+		block->SetSize(block->GetSize() + nextFree->GetSize(), nextBlock);
+		if (nextBlock)
+			nextBlock->SetPreviousBlock(block);
+		else
+			fLastBlock = block;
+		result = true;
+	}
+	return result;
+}
+
+// _MakeUsedBlock
+inline
+Block *
+BlockAllocator::Area::_MakeUsedBlock(void *address, ssize_t offset,
+									 Block *previous, size_t size,
+									 bool hasNext)
+{
+	Block *block = (Block*)((char*)address + offset);
+	block->SetTo(previous, size, false, hasNext, NULL);
+	if (hasNext)
+		block->GetNextBlock()->SetPreviousBlock(block);
+	else
+		fLastBlock = block;
+	return block;
+}
+
+// _Defragment
+void
+BlockAllocator::Area::_Defragment()
+{
+D(SanityCheck());
+//PRINT(("BlockAllocator::Area::_Defragment()\n"));
+	// A trivial strategy for now: Keep the last free block and move the
+	// others so that they can be joined with it. This is done iteratively
+	// by moving the first free block to adjoin to the second one and
+	// coalescing them. A free block is moved by moving the data blocks in
+	// between.
+	TFreeBlock *nextFree = NULL;
+	while (fFirstFree && (nextFree = fFirstFree->GetNextFreeBlock()) != NULL) {
+		Block *prevBlock = fFirstFree->GetPreviousBlock();
+		Block *nextBlock = fFirstFree->GetNextBlock();
+		size_t size = fFirstFree->GetSize();
+		// Used blocks are relatively position independed. We can move them
+		// en bloc and only need to adjust the previous pointer of the first
+		// one.
+		if (!nextBlock->IsFree()) {
+			// move the used blocks
+			size_t chunkSize = (char*)nextFree - (char*)nextBlock;
+			Block *nextFreePrev = nextFree->GetPreviousBlock();
+			Block *movedBlock = fFirstFree;
+			memmove(movedBlock, nextBlock, chunkSize);
+			movedBlock->SetPreviousBlock(prevBlock);
+			// init the first free block
+			Block *movedNextFreePrev = (Block*)((char*)nextFreePrev - size);
+			fFirstFree = _MakeFreeBlock(movedBlock, chunkSize,
+				movedNextFreePrev, size, true, NULL, nextFree);
+			nextFree->SetPreviousFreeBlock(fFirstFree);
+			// fix the references of the moved blocks
+			for (Block *block = movedBlock;
+				 block != fFirstFree;
+				 block = block->GetNextBlock()) {
+				block->FixReference();
+			}
+		} else {
+			// uncoalesced adjoining free block: That should never happen,
+			// since we always coalesce as early as possible.
+			INFORM(("Warning: Found uncoalesced adjoining free blocks!\n"));
+		}
+		// coalesce the first two blocks
+D(SanityCheck());
+		_CoalesceWithNext(fFirstFree);
+D(SanityCheck());
+	}
+//D(SanityCheck());
+//PRINT(("BlockAllocator::Area::_Defragment() done\n"));
+}
+

src/add-ons/kernel/file_systems/ramfs/BlockAllocatorArea.h

@@ -0,0 +1,175 @@
+// BlockAllocatorArea.h
+
+#ifndef BLOCK_ALLOCATOR_AREA_H
+#define BLOCK_ALLOCATOR_AREA_H
+
+#include "BlockAllocator.h"
+#include "BlockAllocatorMisc.h"
+#include "DLList.h"
+
+class BlockAllocator::Area : public DLListLinkImpl<Area> {
+public:
+	static Area *Create(size_t size);
+	void Delete();
+
+	inline void SetBucket(AreaBucket *bucket)		{ fBucket = bucket; }
+	inline AreaBucket *GetBucket() const			{ return fBucket; }
+
+	inline Block *GetFirstBlock() const				{ return fFirstBlock; }
+	inline Block *GetLastBlock() const				{ return fLastBlock; }
+
+	inline TFreeBlock *GetFirstFreeBlock() const	{ return fFirstFree; }
+	inline TFreeBlock *GetLastFreeBlock() const		{ return fLastFree; }
+
+	inline bool IsEmpty() const				{ return (fUsedBlockCount == 0); }
+	inline Block *GetFirstUsedBlock() const;
+
+	static inline size_t GetMaxFreeBytesFor(size_t areaSize);
+
+	inline size_t GetFreeBytes() const		{ return fFreeBytes; }
+	inline bool NeedsDefragmenting() const	{ return (fFreeBlockCount > 1); }
+
+	inline int32 GetBucketIndex();
+
+	Block *AllocateBlock(size_t usableSize, bool dontDefragment = false);
+	void FreeBlock(Block *block, bool dontDefragment = false);
+	Block *ResizeBlock(Block *block, size_t newSize,
+					   bool dontDefragment = false);
+
+	// debugging only
+	bool SanityCheck() const;
+	bool CheckBlock(Block *block, size_t minSize = 0);
+
+private:
+	inline size_t _GetBlockFreeBytes()
+		{ return fFreeBytes + sizeof(BlockHeader); }
+
+	Area(area_id id, size_t size);
+	~Area();
+
+	inline void _FixBlockList(Block *block, Block *prevBlock,
+							  Block *nextBlock);
+	inline void _FixFreeList(TFreeBlock *block, TFreeBlock *prevFree,
+							 TFreeBlock *nextFree);
+
+	TFreeBlock *_FindFreeBlock(size_t minSize);
+	void _InsertFreeBlock(TFreeBlock *block);
+	void _RemoveFreeBlock(TFreeBlock *block);
+	TFreeBlock * _MoveResizeFreeBlock(TFreeBlock *freeBlock, ssize_t offset,
+									  size_t newSize);
+	inline TFreeBlock *_MakeFreeBlock(void *address, ssize_t offset,
+		Block *previous, size_t size, bool hasNext, TFreeBlock *previousFree,
+		TFreeBlock *nextFree);
+	bool _CoalesceWithNext(TFreeBlock *block);
+
+	inline Block *_MakeUsedBlock(void *address, ssize_t offset,
+								 Block *previous, size_t size, bool hasNext);
+
+	inline bool _DefragmentingRecommended();
+	void _Defragment();
+
+private:
+	AreaBucket			*fBucket;
+	area_id				fID;
+	size_t				fSize;
+	size_t				fFreeBytes;
+	size_t				fFreeBlockCount;
+	size_t				fUsedBlockCount;
+	Block				*fFirstBlock;
+	Block				*fLastBlock;
+	TFreeBlock			*fFirstFree;
+	TFreeBlock			*fLastFree;
+};
+
+typedef BlockAllocator::Area Area;
+
+
+// inline methods
+
+// debugging
+#if BA_DEFINE_INLINES
+
+// GetFirstUsedBlock
+inline
+Block *
+BlockAllocator::Area::GetFirstUsedBlock() const
+{
+	// Two assumptions:
+	// 1) There is always a first block. If that isn't so, our structure are
+	//    corrupt.
+	// 2) If the first block is free, the second (if any) is not. Otherwise
+	//    there were adjoining free blocks, which our coalescing strategy
+	//    prevents.
+	return (fFirstBlock->IsFree() ? fFirstBlock->GetNextBlock() : fFirstBlock);
+}
+
+// GetMaxFreeBytesFor
+inline
+size_t
+BlockAllocator::Area::GetMaxFreeBytesFor(size_t areaSize)
+{
+	size_t headerSize = block_align_ceil(sizeof(Area));
+	return Block::GetUsableSizeFor(block_align_floor(areaSize - headerSize));
+}
+
+// GetBucketIndex
+inline
+int32
+BlockAllocator::Area::GetBucketIndex()
+{
+	return bucket_containing_size(GetFreeBytes());
+}
+
+// _FixBlockList
+inline
+void
+BlockAllocator::Area::_FixBlockList(Block *block, Block *prevBlock,
+									Block *nextBlock)
+{
+	if (block) {
+		if (prevBlock)
+			prevBlock->SetNextBlock(block);
+		else
+			fFirstBlock = block;
+		if (nextBlock)
+			nextBlock->SetPreviousBlock(block);
+		else
+			fLastBlock = block;
+	}
+}
+
+// _FixFreeList
+inline
+void
+BlockAllocator::Area::_FixFreeList(TFreeBlock *block, TFreeBlock *prevFree,
+								   TFreeBlock *nextFree)
+{
+	if (block) {
+		if (prevFree)
+			prevFree->SetNextFreeBlock(block);
+		else
+			fFirstFree = block;
+		if (nextFree)
+			nextFree->SetPreviousFreeBlock(block);
+		else
+			fLastFree = block;
+		block->SetPreviousFreeBlock(prevFree);
+		block->SetNextFreeBlock(nextFree);
+	}
+}
+
+// _DefragmentingRecommended
+inline
+bool
+BlockAllocator::Area::_DefragmentingRecommended()
+{
+	// Defragmenting Condition: At least more than 5 free blocks and
+	// free / block ratio greater 1 / 10. Don't know, if that makes any
+	// sense. ;-)
+	return (fFreeBlockCount > 5 && fUsedBlockCount / fFreeBlockCount < 10);
+}
+
+#endif	// BA_DEFINE_INLINES
+
+
+#endif	// BLOCK_ALLOCATOR_AREA_H

src/add-ons/kernel/file_systems/ramfs/BlockAllocatorAreaBucket.cpp

@@ -0,0 +1,51 @@
+// BlockAllocatorAreaBucket.cpp
+
+#include "BlockAllocatorAreaBucket.h"
+
+// constructor
+BlockAllocator::AreaBucket::AreaBucket()
+	: fAreas(),
+	  fIndex(-1),
+	  fMinSize(0),
+	  fMaxSize(0)
+{
+}
+
+// destructor
+BlockAllocator::AreaBucket::~AreaBucket()
+{
+	while (Area *area = fAreas.GetFirst()) {
+		RemoveArea(area);
+		area->Delete();
+	}
+}
+
+// SanityCheck
+bool
+BlockAllocator::AreaBucket::SanityCheck(bool deep) const
+{
+	// check area list
+	for (Area *area = GetFirstArea(); area; area = GetNextArea(area)) {
+		if (deep) {
+			if (!area->SanityCheck())
+				return false;
+		}
+		// bucket
+		if (area->GetBucket() != this) {
+			FATAL(("Area %p is in bucket %p, but thinks it is in bucket %p\n",
+				   area, this, area->GetBucket()));
+			BA_PANIC("Wrong area bucket.");
+			return false;
+		}
+		// size
+		size_t areaSize = area->GetFreeBytes();
+		if (areaSize < fMinSize || areaSize >= fMaxSize) {
+			FATAL(("Area is in wrong bucket: free: %lu, min: %lu, max: %lu\n",
+				   areaSize, fMinSize, fMaxSize));
+			BA_PANIC("Area in wrong bucket.");
+			return false;
+		}
+	}
+	return true;
+}
+

src/add-ons/kernel/file_systems/ramfs/BlockAllocatorAreaBucket.h

@@ -0,0 +1,97 @@
+// BlockAllocatorAreaBucket.h
+
+#ifndef BLOCK_ALLOCATOR_AREA_BUCKET_H
+#define BLOCK_ALLOCATOR_AREA_BUCKET_H
+
+#include "BlockAllocator.h"
+#include "BlockAllocatorArea.h"
+#include "Debug.h"
+#include "DLList.h"
+
+class BlockAllocator::AreaBucket {
+public:
+	AreaBucket();
+	~AreaBucket();
+
+	inline void SetIndex(int32 index)	{ fIndex = index; }
+	inline int32 GetIndex() const		{ return fIndex; }
+
+	inline void SetSizeLimits(size_t minSize, size_t maxSize);
+	inline size_t GetMinSize() const	{ return fMinSize; }	// incl.
+	inline size_t GetMaxSize() const	{ return fMaxSize; }	// excl.
+
+	inline void AddArea(Area *area);
+	inline void RemoveArea(Area *area);
+
+	inline Area *GetFirstArea() const	{ return fAreas.GetFirst(); }
+	inline Area *GetLastArea() const	{ return fAreas.GetLast(); }
+	inline Area *GetNextArea(Area* area) const;
+
+	inline bool IsEmpty() const			{ return fAreas.IsEmpty(); }
+
+	// debugging only
+	bool SanityCheck(bool deep = false) const;
+
+private:
+	DLList<Area>	fAreas;
+	int32			fIndex;
+	size_t			fMinSize;
+	size_t			fMaxSize;
+};
+
+typedef BlockAllocator::AreaBucket AreaBucket;
+
+
+// inline methods
+
+// debugging
+#if BA_DEFINE_INLINES
+
+// SetSizeLimits
+/*!	\brief Sets the size limits for areas this bucket may contain.
+	\param minSize Minimal area size. Inclusively.
+	\param maxSize Maximal area size. Exlusively.
+*/
+inline
+void
+BlockAllocator::AreaBucket::SetSizeLimits(size_t minSize, size_t maxSize)
+{
+	fMinSize = minSize;
+	fMaxSize = maxSize;
+}
+
+// AddArea
+inline
+void
+BlockAllocator::AreaBucket::AddArea(Area *area)
+{
+	if (area) {
+		fAreas.Insert(area, area->NeedsDefragmenting());
+		area->SetBucket(this);
+		D(SanityCheck(false));
+	}
+}
+
+// RemoveArea
+inline
+void
+BlockAllocator::AreaBucket::RemoveArea(Area *area)
+{
+	if (area) {
+		fAreas.Remove(area);
+		area->SetBucket(NULL);
+		D(SanityCheck(false));
+	}
+}
+
+// GetNextArea
+inline
+Area *
+BlockAllocator::AreaBucket::GetNextArea(Area* area) const
+{
+	return fAreas.GetNext(area);
+}
+
+#endif	// BA_DEFINE_INLINES
+
+#endif	// BLOCK_ALLOCATOR_AREA_BUCKET_H

src/add-ons/kernel/file_systems/ramfs/BlockAllocatorMisc.h

@@ -0,0 +1,36 @@
+// BlockAllocatorMisc.h
+
+#ifndef BLOCK_ALLOCATOR_MISC_H
+#define BLOCK_ALLOCATOR_MISC_H
+
+#include "Block.h"
+#include "Misc.h"
+
+// block alignment -- start offsets and size
+static const size_t kBlockAlignment = 4;	// must be a power of 2
+
+// block_align_{floor,ceil}
+static inline size_t block_align_floor(size_t value)
+	{ return value & ~(kBlockAlignment - 1); }
+static inline size_t block_align_ceil(size_t value)
+	{ return (value + kBlockAlignment - 1) & ~(kBlockAlignment - 1); }
+
+// minimal size of a gross/net block
+// BAD DOG: No initializers in the kernel!
+//static const size_t kMinBlockSize = block_align_ceil(sizeof(TFreeBlock));
+#define kMinBlockSize	(block_align_ceil(sizeof(TFreeBlock)))
+static const size_t kMinNetBlockSize = 8;
+
+static const size_t kDefragmentingTolerance = 10240;
+
+// bucket_containing_size -- bucket for to contain an area with size
+static inline int bucket_containing_size(size_t size)
+	{ return fls(size / kMinNetBlockSize) + 1; }
+
+// bucket_containing_min_size -- bucket containing areas >= size
+static inline int
+bucket_containing_min_size(size_t size)
+	{ return (size ? bucket_containing_size(size - 1) + 1 : 0); }
+
+
+#endif BLOCK_ALLOCATOR_MISC_H

src/add-ons/kernel/file_systems/ramfs/BlockReferenceManager.cpp

@@ -0,0 +1,130 @@
+// BlockReferenceManager.cpp
+
+#include "AllocationInfo.h"
+#include "Block.h"
+#include "BlockAllocator.h"		// only for BA_PANIC
+#include "BlockReferenceManager.h"
+#include "Debug.h"
+
+static const int kBlockReferenceTableSize = 128;
+
+// constructor
+BlockReferenceManager::BlockReferenceManager()
+	: fTables(10),
+	  fFreeList(NULL)
+{
+}
+
+// destructor
+BlockReferenceManager::~BlockReferenceManager()
+{
+}
+
+// AllocateReference
+BlockReference *
+BlockReferenceManager::AllocateReference()
+{
+	BlockReference *reference = NULL;
+	if (!fFreeList)
+		_AddTable();
+	if (fFreeList) {
+		reference = fFreeList;
+		fFreeList = *(BlockReference**)fFreeList;
+	}
+	return reference;
+}
+
+// FreeReference
+void
+BlockReferenceManager::FreeReference(BlockReference *reference)
+{
+	if (reference) {
+		*(BlockReference**)reference = fFreeList;
+		fFreeList = reference;
+	}
+}
+
+// CheckReference
+bool
+BlockReferenceManager::CheckReference(BlockReference *reference)
+{
+	if (reference) {
+		uint32 address = (uint32)reference;
+		int32 tableCount = fTables.CountItems();
+		for (int32 i = 0; i < tableCount; i++) {
+			Table *table = &fTables.ItemAt(i);
+			uint32 first = (uint32)table->GetReferences();
+			uint32 last = (uint32)(table->GetReferences() + table->GetSize());
+			if (first <= address && address < last)
+				return true;
+		}
+	}
+	FATAL(("BlockReference %p does not exist!\n", reference));
+	BA_PANIC("BlockReference doesn't exist.");
+	return false;
+}
+
+// GetAllocationInfo
+void
+BlockReferenceManager::GetAllocationInfo(AllocationInfo &info)
+{
+	info.AddListAllocation(fTables.GetCapacity(), sizeof(Table));
+	int32 count = fTables.CountItems();
+	for (int32 i = 0; i < count; i++) {
+		Table &table = fTables.ItemAt(i);
+		info.AddOtherAllocation(table.GetSize() * sizeof(BlockReference));
+	}
+}
+
+// _AddTable
+status_t
+BlockReferenceManager::_AddTable()
+{
+	status_t error = B_OK;
+	// add a new table
+	Table dummy;
+	if (fTables.AddItem(dummy)) {
+		int32 index = fTables.CountItems() - 1;
+		Table &table = fTables.ItemAt(index);
+		error = table.Init(kBlockReferenceTableSize);
+		if (error == B_OK) {
+			// add the references to the free list
+			uint32 count = table.GetSize();
+			BlockReference *references = table.GetReferences();
+			for (uint32 i = 0; i < count; i++) {
+				BlockReference *reference = references + i;
+				*(BlockReference**)reference = fFreeList;
+				fFreeList = reference;
+			}
+		} else
+			fTables.RemoveItem(index);
+	} else
+		SET_ERROR(error, B_NO_MEMORY);
+	return error;
+}
+
+
+// Table
+
+// destructor
+BlockReferenceManager::Table::~Table()
+{
+	if (fReferences)
+		delete[] fReferences;
+}
+
+// Init
+status_t
+BlockReferenceManager::Table::Init(int32 size)
+{
+	status_t error = (size > 0 ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		fReferences = new(nothrow) BlockReference[size];
+		if (fReferences)
+			fSize = size;
+		else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+

src/add-ons/kernel/file_systems/ramfs/BlockReferenceManager.h

@@ -0,0 +1,49 @@
+// BlockReferenceManager.h
+
+#ifndef BLOCK_REFERENCE_MANAGER_H
+#define BLOCK_REFERENCE_MANAGER_H
+
+#include "List.h"
+
+class AllocationInfo;
+class BlockReference;
+
+class BlockReferenceManager {
+public:
+	BlockReferenceManager();
+	~BlockReferenceManager();
+
+	BlockReference *AllocateReference();
+	void FreeReference(BlockReference *reference);
+
+	// debugging only
+	bool CheckReference(BlockReference *reference);
+	void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	status_t _AddTable();
+
+private:
+	class Table {
+	public:
+		Table() : fSize(0), fReferences(NULL) {}
+		Table(int) : fSize(0), fReferences(NULL) {}
+		~Table();
+
+		status_t Init(int32 size);
+
+		BlockReference *GetReferences()	{ return fReferences; }
+
+		int32 GetSize() const { return fSize; }
+
+	private:
+		uint32			fSize;
+		BlockReference	*fReferences;
+	};
+
+	List<Table>			fTables;
+	BlockReference		*fFreeList;
+};
+
+#endif	// BLOCK_REFERENCE_MANAGER_H
+

src/add-ons/kernel/file_systems/ramfs/DataContainer.cpp

@@ -0,0 +1,417 @@
+// DataContainer.cpp
+
+#include "AllocationInfo.h"
+#include "Attribute.h"	// for debugging only
+#include "Block.h"
+#include "DataContainer.h"
+#include "Debug.h"
+#include "Misc.h"
+#include "Node.h"		// for debugging only
+#include "Volume.h"
+
+// constructor
+DataContainer::DataContainer(Volume *volume)
+	: fVolume(volume),
+	  fSize(0)
+{
+}
+
+// destructor
+DataContainer::~DataContainer()
+{
+	Resize(0);
+}
+
+// InitCheck
+status_t
+DataContainer::InitCheck() const
+{
+	return (fVolume ? B_OK : B_ERROR);
+}
+
+// Resize
+status_t
+DataContainer::Resize(off_t newSize)
+{
+	status_t error = B_OK;
+	if (newSize < 0)
+		newSize = 0;
+	if (newSize != fSize) {
+		// Shrinking should never fail. Growing can fail, if we run out of
+		// memory. Then we try to shrink back to the original size.
+		off_t oldSize = fSize;
+		error = _Resize(newSize);
+		if (error == B_NO_MEMORY && newSize > fSize)
+			_Resize(oldSize);
+	}
+	return error;
+}
+
+// ReadAt
+status_t
+DataContainer::ReadAt(off_t offset, void *_buffer, size_t size,
+					  size_t *bytesRead)
+{
+	uint8 *buffer = (uint8*)_buffer;
+	status_t error = (buffer && offset >= 0 && bytesRead ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// read not more than we have to offer
+		offset = min(offset, fSize);
+		size = min(size, size_t(fSize - offset));
+		// iterate through the blocks, reading as long as there's something
+		// left to read
+		size_t blockSize = fVolume->GetBlockSize();
+		*bytesRead = 0;
+		while (size > 0) {
+			size_t inBlockOffset = offset % blockSize;
+			size_t toRead = min(size, size_t(blockSize - inBlockOffset));
+			void *blockData = _GetBlockDataAt(offset / blockSize,
+											  inBlockOffset, toRead);
+D(
+if (!blockData) {
+	Node *node = NULL;
+	if (Attribute *attribute = dynamic_cast<Attribute*>(this)) {
+		FATAL(("attribute `%s' of\n", attribute->GetName()));
+		node = attribute->GetNode();
+	} else {
+		node = dynamic_cast<Node*>(this);
+	}
+	if (node)
+//		FATAL(("node `%s'\n", node->GetName()));
+		FATAL(("container size: %Ld, offset: %Ld, buffer size: %lu\n",
+		   fSize, offset, size));
+		return B_ERROR;
+}
+);
+			memcpy(buffer, blockData, toRead);
+			buffer += toRead;
+			size -= toRead;
+			offset += toRead;
+			*bytesRead += toRead;
+		}
+	}
+	return error;
+}
+
+// WriteAt
+status_t
+DataContainer::WriteAt(off_t offset, const void *_buffer, size_t size,
+					   size_t *bytesWritten)
+{
+//PRINT(("DataContainer::WriteAt(%Ld, %p, %lu, %p), fSize: %Ld\n", offset, _buffer, size, bytesWritten, fSize));
+	const uint8 *buffer = (const uint8*)_buffer;
+	status_t error = (buffer && offset >= 0 && bytesWritten
+					  ? B_OK : B_BAD_VALUE);
+	// resize the container, if necessary
+	if (error == B_OK) {
+		off_t newSize = offset + size;
+		off_t oldSize = fSize;
+		if (newSize > fSize) {
+			error = Resize(newSize);
+			// pad with zero, if necessary
+			if (error == B_OK && offset > oldSize)
+				_ClearArea(offset, oldSize - offset);
+		}
+	}
+	if (error == B_OK) {
+		// iterate through the blocks, writing as long as there's something
+		// left to write
+		size_t blockSize = fVolume->GetBlockSize();
+		*bytesWritten = 0;
+		while (size > 0) {
+			size_t inBlockOffset = offset % blockSize;
+			size_t toWrite = min(size, size_t(blockSize - inBlockOffset));
+			void *blockData = _GetBlockDataAt(offset / blockSize,
+											  inBlockOffset, toWrite);
+D(if (!blockData) return B_ERROR;);
+			memcpy(blockData, buffer, toWrite);
+			buffer += toWrite;
+			size -= toWrite;
+			offset += toWrite;
+			*bytesWritten += toWrite;
+		}
+	}
+//PRINT(("DataContainer::WriteAt() done: %lx, fSize: %Ld\n", error, fSize));
+	return error;
+}
+
+// GetFirstDataBlock
+void
+DataContainer::GetFirstDataBlock(const uint8 **data, size_t *length)
+{
+	if (data && length) {
+		if (_IsBlockMode()) {
+			BlockReference *block = _GetBlockList()->ItemAt(0);
+			*data = (const uint8*)block->GetData();
+			*length = min(fSize, fVolume->GetBlockSize());
+		} else {
+			*data = fSmallBuffer;
+			*length = fSize;
+		}
+	}
+}
+
+// GetAllocationInfo
+void
+DataContainer::GetAllocationInfo(AllocationInfo &info)
+{
+	if (_IsBlockMode()) {
+		BlockList *blocks = _GetBlockList();
+		info.AddListAllocation(blocks->GetCapacity(), sizeof(BlockReference*));
+		int32 blockCount = blocks->CountItems();
+		for (int32 i = 0; i < blockCount; i++)
+			info.AddBlockAllocation(blocks->ItemAt(i)->GetBlock()->GetSize());
+	} else {
+		// ...
+	}
+}
+
+// _RequiresBlockMode
+inline
+bool
+DataContainer::_RequiresBlockMode(size_t size)
+{
+	return (size > kSmallDataContainerSize);
+}
+
+// _IsBlockMode
+inline
+bool
+DataContainer::_IsBlockMode() const
+{
+	return (fSize > kSmallDataContainerSize);
+}
+
+// _Resize
+status_t
+DataContainer::_Resize(off_t newSize)
+{
+//PRINT(("DataContainer::_Resize(%Ld), fSize: %Ld\n", newSize, fSize));
+	status_t error = B_OK;
+	if (newSize != fSize) {
+		size_t blockSize = fVolume->GetBlockSize();
+		int32 blockCount = _CountBlocks();
+		int32 newBlockCount = (newSize + blockSize - 1) / blockSize;
+		if (newBlockCount == blockCount) {
+			// only the last block needs to be resized
+			if (_IsBlockMode() && _RequiresBlockMode(newSize)) {
+				// keep block mode
+				error = _ResizeLastBlock((newSize - 1) % blockSize + 1);
+			} else if (!_IsBlockMode() && !_RequiresBlockMode(newSize)) {
+				// keep small buffer mode
+				fSize = newSize;
+			} else if (fSize < newSize) {
+				// switch to block mode
+				_SwitchToBlockMode(newSize);
+			} else {
+				// switch to small buffer mode
+				_SwitchToSmallBufferMode(newSize);
+			}
+		} else if (newBlockCount < blockCount) {
+			// shrink
+			if (_IsBlockMode()) {
+				// remove the last blocks
+				BlockList *blocks = _GetBlockList();
+				for (int32 i = blockCount - 1; i >= newBlockCount; i--) {
+					BlockReference *block = blocks->ItemAt(i);
+					blocks->RemoveItem(i);
+					fVolume->FreeBlock(block);
+					fSize = (fSize - 1) / blockSize * blockSize;
+				}
+				// resize the last block to the correct size, respectively
+				// switch to small buffer mode
+				if (_RequiresBlockMode(newSize))
+					error = _ResizeLastBlock((newSize - 1) % blockSize + 1);
+				else
+					_SwitchToSmallBufferMode(newSize);
+			} else {
+				// small buffer mode: just set the new size
+				fSize = newSize;
+			}
+		} else {
+			// grow
+			if (_RequiresBlockMode(newSize)) {
+				// resize the first block to the correct size, respectively
+				// switch to block mode
+				if (_IsBlockMode())
+					error = _ResizeLastBlock(blockSize);
+				else {
+					error = _SwitchToBlockMode(min((size_t)newSize,
+												   blockSize));
+				}
+				// add new blocks
+				BlockList *blocks = _GetBlockList();
+				while (error == B_OK && fSize < newSize) {
+					size_t newBlockSize = min(size_t(newSize - fSize),
+											  blockSize);
+					BlockReference *block = NULL;
+					error = fVolume->AllocateBlock(newBlockSize, &block);
+					if (error == B_OK) {
+						if (blocks->AddItem(block))
+							fSize += newBlockSize;
+						else {
+							SET_ERROR(error, B_NO_MEMORY);
+							fVolume->FreeBlock(block);
+						}
+					}
+				}
+			} else {
+				// no need to switch to block mode: just set the new size
+				fSize = newSize;
+			}
+		}
+	}
+//PRINT(("DataContainer::_Resize() done: %lx, fSize: %Ld\n", error, fSize));
+	return error;
+}
+
+// _GetBlockList
+inline
+DataContainer::BlockList *
+DataContainer::_GetBlockList()
+{
+	return (BlockList*)fBlocks;
+}
+
+// _GetBlockList
+inline
+const DataContainer::BlockList *
+DataContainer::_GetBlockList() const
+{
+	return (BlockList*)fBlocks;
+}
+
+// _CountBlocks
+inline
+int32
+DataContainer::_CountBlocks() const
+{
+	if (_IsBlockMode())
+		return _GetBlockList()->CountItems();
+	else if (fSize == 0)	// small buffer mode, empty buffer
+		return 0;
+	return 1;	// small buffer mode, non-empty buffer
+}
+
+// _GetBlockDataAt
+inline
+void *
+DataContainer::_GetBlockDataAt(int32 index, size_t offset, size_t DARG(size))
+{
+	if (_IsBlockMode()) {
+		BlockReference *block = _GetBlockList()->ItemAt(index);
+D(if (!fVolume->CheckBlock(block, offset + size)) return NULL;);
+		return block->GetDataAt(offset);
+	} else {
+D(
+if (offset + size > kSmallDataContainerSize) {
+	FATAL(("DataContainer: Data access exceeds small buffer.\n"));
+	PANIC("DataContainer: Data access exceeds small buffer.");
+	return NULL;
+}
+);
+		return fSmallBuffer + offset;
+	}
+}
+
+// _ClearArea
+void
+DataContainer::_ClearArea(off_t offset, off_t size)
+{
+	// constrain the area to the data area
+	offset = min(offset, fSize);
+	size = min(size, fSize - offset);
+	// iterate through the blocks, clearing as long as there's something
+	// left to clear
+	size_t blockSize = fVolume->GetBlockSize();
+	while (size > 0) {
+		size_t inBlockOffset = offset % blockSize;
+		size_t toClear = min(size_t(size), blockSize - inBlockOffset);
+		void *blockData = _GetBlockDataAt(offset / blockSize, inBlockOffset,
+										  toClear);
+D(if (!blockData) return;);
+		memset(blockData, 0, toClear);
+		size -= toClear;
+		offset += toClear;
+	}
+}
+
+// _ResizeLastBlock
+status_t
+DataContainer::_ResizeLastBlock(size_t newSize)
+{
+//PRINT(("DataContainer::_ResizeLastBlock(%lu), fSize: %Ld\n", newSize, fSize));
+	int32 blockCount = _CountBlocks();
+	status_t error = (fSize > 0 && blockCount > 0 && newSize > 0
+					  ? B_OK : B_BAD_VALUE);
+D(
+if (!_IsBlockMode()) {
+	FATAL(("Call of _ResizeLastBlock() in small buffer mode.\n"));
+	PANIC("Call of _ResizeLastBlock() in small buffer mode.");
+	return B_ERROR;
+}
+);
+	if (error == B_OK) {
+		size_t blockSize = fVolume->GetBlockSize();
+		size_t oldSize = (fSize - 1) % blockSize + 1;
+		if (newSize != oldSize) {
+			BlockList *blocks = _GetBlockList();
+			BlockReference *block = blocks->ItemAt(blockCount - 1);
+			BlockReference *newBlock = fVolume->ResizeBlock(block, newSize);
+			if (newBlock) {
+				if (newBlock != block)
+					blocks->ReplaceItem(blockCount - 1, newBlock);
+				fSize += off_t(newSize) - oldSize;
+			} else
+				SET_ERROR(error, B_NO_MEMORY);
+		}
+	}
+//PRINT(("DataContainer::_ResizeLastBlock() done: %lx, fSize: %Ld\n", error, fSize));
+	return error;
+}
+
+// _SwitchToBlockMode
+status_t
+DataContainer::_SwitchToBlockMode(size_t newBlockSize)
+{
+	// allocate a new block
+	BlockReference *block = NULL;
+	status_t error = fVolume->AllocateBlock(newBlockSize, &block);
+	if (error == B_OK) {
+		// copy the data from the small buffer into the block
+		if (fSize > 0)
+			memcpy(block->GetData(), fSmallBuffer, fSize);
+		// construct the block list and add the block
+		new (fBlocks) BlockList(10);
+		BlockList *blocks = _GetBlockList();
+		if (blocks->AddItem(block)) {
+			fSize = newBlockSize;
+		} else {
+			// error: destroy the block list and free the block
+			SET_ERROR(error, B_NO_MEMORY);
+			blocks->~BlockList();
+			if (fSize > 0)
+				memcpy(fSmallBuffer, block->GetData(), fSize);
+			fVolume->FreeBlock(block);
+		}
+	}
+	return error;
+}
+
+// _SwitchToSmallBufferMode
+void
+DataContainer::_SwitchToSmallBufferMode(size_t newSize)
+{
+	// remove the first (and only) block
+	BlockList *blocks = _GetBlockList();
+	BlockReference *block = blocks->ItemAt(0);
+	blocks->RemoveItem(0L);
+	// destroy the block list and copy the data into the small buffer
+	blocks->~BlockList();
+	if (newSize > 0)
+		memcpy(fSmallBuffer, block->GetData(), newSize);
+	// free the block and set the new size
+	fVolume->FreeBlock(block);
+	fSize = newSize;
+}
+

src/add-ons/kernel/file_systems/ramfs/DataContainer.h

@@ -0,0 +1,84 @@
+// DataContainer.h
+
+#ifndef DATA_CONTAINER_H
+#define DATA_CONTAINER_H
+
+#include "List.h"
+
+class AllocationInfo;
+class BlockReference;
+class Volume;
+
+// Size of the DataContainer's small buffer. If it contains data up to this
+// size, no blocks are allocated, but the small buffer is used instead.
+// 16 bytes are for free, since they are shared with the block list.
+// (actually even more, since the list has an initial size).
+// I ran a test analyzing what sizes the attributes in my system have:
+//     size   percentage   bytes used in average 
+//   <=   0         0.00                   93.45
+//   <=   4        25.46                   75.48
+//   <=   8        30.54                   73.02
+//   <=  16        52.98                   60.37
+//   <=  32        80.19                   51.74
+//   <=  64        94.38                   70.54
+//   <= 126        96.90                  128.23
+//
+// For average memory usage it is assumed, that attributes larger than 126
+// bytes have size 127, that the list has an initial capacity of 10 entries
+// (40 bytes), that the block reference consumes 4 bytes and the block header
+// 12 bytes. The optimal length is actually 35, with 51.05 bytes per
+// attribute, but I conservatively rounded to 32.
+static const size_t kSmallDataContainerSize = 32;
+
+class DataContainer {
+public:
+	DataContainer(Volume *volume);
+	virtual ~DataContainer();
+
+	status_t InitCheck() const;
+
+	Volume *GetVolume() const	{ return fVolume; }
+
+	status_t Resize(off_t newSize);
+	off_t GetSize() const { return fSize; }
+
+	virtual status_t ReadAt(off_t offset, void *buffer, size_t size,
+							size_t *bytesRead);
+	virtual status_t WriteAt(off_t offset, const void *buffer, size_t size,
+							 size_t *bytesWritten);
+
+	void GetFirstDataBlock(const uint8 **data, size_t *length);
+
+	// debugging
+	void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	typedef List<BlockReference*>	BlockList;
+
+private:
+	static inline bool _RequiresBlockMode(size_t size);
+	inline bool _IsBlockMode() const;
+
+	inline BlockList *_GetBlockList();
+	inline const BlockList *_GetBlockList() const;
+	inline int32 _CountBlocks() const;
+	inline void *_GetBlockDataAt(int32 index, size_t offset, size_t size);
+
+	void _ClearArea(off_t offset, off_t size);
+
+	status_t _Resize(off_t newSize);
+	status_t _ResizeLastBlock(size_t newSize);
+
+	status_t _SwitchToBlockMode(size_t newBlockSize);
+	void _SwitchToSmallBufferMode(size_t newSize);
+
+private:
+	Volume					*fVolume;
+	off_t					fSize;
+	union {
+		uint8				fBlocks[sizeof(BlockList)];
+		uint8				fSmallBuffer[kSmallDataContainerSize];
+	};
+};
+
+#endif	// DATA_CONTAINER_H

src/add-ons/kernel/file_systems/ramfs/Directory.cpp

@@ -0,0 +1,348 @@
+// Directory.cpp
+
+#include "AllocationInfo.h"
+#include "Debug.h"
+#include "Directory.h"
+#include "Entry.h"
+#include "EntryIterator.h"
+#include "File.h"
+#include "SymLink.h"
+#include "Volume.h"
+
+// constructor
+Directory::Directory(Volume *volume)
+	: Node(volume, NODE_TYPE_DIRECTORY),
+	  fEntries()
+{
+}
+
+// destructor
+Directory::~Directory()
+{
+	// delete all entries
+	while (Entry *entry = fEntries.GetFirst()) {
+		if (DeleteEntry(entry) != B_OK) {
+			FATAL(("Could not delete all entries in directory.\n"));
+			break;
+		}
+	}
+}
+
+// Link
+status_t
+Directory::Link(Entry *entry)
+{
+	if (fReferrers.IsEmpty())
+		return Node::Link(entry);
+	return B_IS_A_DIRECTORY;
+}
+
+// Unlink
+status_t
+Directory::Unlink(Entry *entry)
+{
+	if (entry == fReferrers.GetFirst())
+		return Node::Unlink(entry);
+	return B_BAD_VALUE;
+}
+
+// SetSize
+status_t
+Directory::SetSize(off_t /*newSize*/)
+{
+	return B_IS_A_DIRECTORY;
+}
+
+// GetSize
+off_t
+Directory::GetSize() const
+{
+	return 0;
+}
+
+// GetParent
+Directory *
+Directory::GetParent() const
+{
+	Entry *entry = fReferrers.GetFirst();
+	return (entry ? entry->GetParent() : NULL);
+}
+
+// CreateDirectory
+status_t
+Directory::CreateDirectory(const char *name, Directory **directory)
+{
+	status_t error = (name && directory ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// create directory
+		if (Directory *node = new(nothrow) Directory(GetVolume())) {
+			error = _CreateCommon(node, name);
+				// deletes the node on failure
+			if (error == B_OK)
+				*directory = node;
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// CreateFile
+status_t
+Directory::CreateFile(const char *name, File **file)
+{
+	status_t error = (name && file ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// create file
+		if (File *node = new(nothrow) File(GetVolume())) {
+			error = _CreateCommon(node, name);
+				// deletes the node on failure
+			if (error == B_OK)
+				*file = node;
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// CreateSymLink
+status_t
+Directory::CreateSymLink(const char *name, const char *path, SymLink **symLink)
+{
+	status_t error = (name && symlink ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// create symlink
+		if (SymLink *node = new(nothrow) SymLink(GetVolume())) {
+			error = node->SetLinkedPath(path);
+			if (error == B_OK) {
+				error = _CreateCommon(node, name);
+					// deletes the node on failure
+				if (error == B_OK)
+					*symLink = node;
+			} else
+				delete node;
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// AddEntry
+status_t
+Directory::AddEntry(Entry *entry)
+{
+	status_t error = (entry && !entry->GetParent() ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		fEntries.Insert(entry);
+		entry->SetParent(this);
+		error = GetVolume()->EntryAdded(GetID(), entry);
+		if (error == B_OK) {
+			MarkModified();
+		} else {
+			fEntries.Remove(entry);
+			entry->SetParent(NULL);
+		}
+	}
+	return error;
+}
+
+// CreateEntry
+status_t
+Directory::CreateEntry(Node *node, const char *name, Entry **_entry)
+{
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// create an entry
+		Entry *entry = new(nothrow) Entry(name);
+		if (entry) {
+			error = entry->InitCheck();
+			if (error == B_OK) {
+				// link to the node
+				error = entry->Link(node);
+				if (error == B_OK) {
+					// add the entry
+					error = AddEntry(entry);
+					if (error == B_OK) {
+						if (_entry)
+							*_entry = entry;
+					} else {
+						// failure: unlink the node
+						entry->Unlink();
+					}
+				}
+			}
+			// delete the entry on failure
+			if (error != B_OK)
+				delete entry;
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// RemoveEntry
+status_t
+Directory::RemoveEntry(Entry *entry)
+{
+	status_t error = (entry && entry->GetParent() == this ? B_OK
+														  : B_BAD_VALUE);
+	if (error == B_OK) {
+		// move all iterators pointing to the entry to the next entry
+		if (GetVolume()->IteratorLock()) {
+			// set the iterators' current entry
+			Entry *nextEntry = fEntries.GetNext(entry);
+			DLList<EntryIterator> *iterators = entry->GetEntryIteratorList();
+			for (EntryIterator *iterator = iterators->GetFirst();
+				 iterator;
+				 iterator = iterators->GetNext(iterator)) {
+				iterator->SetCurrent(nextEntry, true);
+			}
+			// Move the iterators from one list to the other, or just remove
+			// them, if there is no next entry.
+			if (nextEntry) {
+				DLList<EntryIterator> *nextIterators
+					= nextEntry->GetEntryIteratorList();
+				nextIterators->MoveFrom(iterators);
+			} else
+				iterators->RemoveAll();
+			GetVolume()->IteratorUnlock();
+		} else
+			error = B_ERROR;
+		// remove the entry
+		if (error == B_OK) {
+			error = GetVolume()->EntryRemoved(GetID(), entry);
+			if (error == B_OK) {
+				fEntries.Remove(entry);
+				entry->SetParent(NULL);
+				MarkModified();
+			}
+		}
+	}
+	return error;
+}
+
+// DeleteEntry
+status_t
+Directory::DeleteEntry(Entry *entry)
+{
+	status_t error = RemoveEntry(entry);
+	if (error == B_OK) {
+		error = entry->Unlink();
+		if (error == B_OK)
+			delete entry;
+		else {
+			FATAL(("Failed to Unlink() entry %p from node %Ld!\n", entry,
+				   entry->GetNode()->GetID()));
+			AddEntry(entry);
+		}
+	}
+	return error;
+}
+
+// FindEntry
+status_t
+Directory::FindEntry(const char *name, Entry **_entry) const
+{
+	status_t error = (name && _entry ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+/*
+		Entry *entry = NULL;
+		while (GetNextEntry(&entry) == B_OK) {
+			if (!strcmp(entry->GetName(), name)) {
+				*_entry = entry;
+				return B_OK;
+			}
+		}
+		error = B_ENTRY_NOT_FOUND;
+*/
+		error = GetVolume()->FindEntry(GetID(), name, _entry);
+	}
+	return error;
+}
+
+// FindNode
+status_t
+Directory::FindNode(const char *name, Node **node) const
+{
+	status_t error = (name && node ? B_OK : B_BAD_VALUE);
+	Entry *entry = NULL;
+	if (error == B_OK && (error = FindEntry(name, &entry)) == B_OK)
+		*node = entry->GetNode();
+	return error;
+}
+
+// FindAndGetNode
+status_t
+Directory::FindAndGetNode(const char *name, Node **node, Entry **_entry) const
+{
+	status_t error = (name && node ? B_OK : B_BAD_VALUE);
+	Entry *entry = NULL;
+	if (error == B_OK && (error = FindEntry(name, &entry)) == B_OK) {
+		*node = entry->GetNode();
+		if (_entry)
+			*_entry = entry;
+		error = GetVolume()->GetVNode(*node);
+	}
+	return error;
+}
+
+// GetPreviousEntry
+status_t
+Directory::GetPreviousEntry(Entry **entry) const
+{
+	status_t error = (entry ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (!*entry)
+			*entry = fEntries.GetLast();
+		else if ((*entry)->GetParent() == this)
+			*entry = fEntries.GetPrevious(*entry);
+		else
+			error = B_BAD_VALUE;
+		if (error == B_OK && !*entry)
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// GetNextEntry
+status_t
+Directory::GetNextEntry(Entry **entry) const
+{
+	status_t error = (entry ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (!*entry)
+			*entry = fEntries.GetFirst();
+		else if ((*entry)->GetParent() == this)
+			*entry = fEntries.GetNext(*entry);
+		else
+			error = B_BAD_VALUE;
+		if (error == B_OK && !*entry)
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// GetAllocationInfo
+void
+Directory::GetAllocationInfo(AllocationInfo &info)
+{
+	Node::GetAllocationInfo(info);
+	info.AddDirectoryAllocation();
+	Entry *entry = NULL;
+	while (GetNextEntry(&entry) == B_OK)
+		entry->GetAllocationInfo(info);
+}
+
+// _CreateCommon
+status_t
+Directory::_CreateCommon(Node *node, const char *name)
+{
+	status_t error = node->InitCheck();
+	if (error == B_OK) {
+		// add node to directory
+		error = CreateEntry(node, name);
+	}
+	if (error != B_OK)
+		delete node;
+	return error;
+}
+

src/add-ons/kernel/file_systems/ramfs/Directory.h

@@ -0,0 +1,56 @@
+// Directory.h
+
+#ifndef DIRECTORY_H
+#define DIRECTORY_H
+
+#include "DLList.h"
+#include "Node.h"
+
+class Entry;
+class File;
+class SymLink;
+
+class Directory : public Node {
+public:
+	Directory(Volume *volume);
+	virtual ~Directory();
+
+	virtual status_t Link(Entry *entry);
+	virtual status_t Unlink(Entry *entry);
+
+	virtual status_t SetSize(off_t newSize);
+	virtual off_t GetSize() const;
+
+	Directory *GetParent() const;
+
+	status_t CreateDirectory(const char *name, Directory **directory);
+	status_t CreateFile(const char *name, File **file);
+	status_t CreateSymLink(const char *name, const char *path,
+						   SymLink **symLink);
+
+	bool IsEmpty() const { return fEntries.IsEmpty(); }
+
+	status_t AddEntry(Entry *entry);
+	status_t CreateEntry(Node *node, const char *name, Entry **entry = NULL);
+	status_t RemoveEntry(Entry *entry);
+	status_t DeleteEntry(Entry *entry);
+
+	status_t FindEntry(const char *name, Entry **entry) const;
+	status_t FindNode(const char *name, Node **node) const;
+	status_t FindAndGetNode(const char *name, Node **node,
+							Entry **entry = NULL) const;
+
+	status_t GetPreviousEntry(Entry **entry) const;
+	status_t GetNextEntry(Entry **entry) const;
+
+	// debugging
+	virtual void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	status_t _CreateCommon(Node *node, const char *name);
+
+private:
+	DLList<Entry>	fEntries;
+};
+
+#endif	// DIRECTORY_H

src/add-ons/kernel/file_systems/ramfs/Entry.cpp

@@ -0,0 +1,104 @@
+// Entry.cpp
+
+#include "AllocationInfo.h"
+#include "Debug.h"
+#include "Entry.h"
+#include "EntryIterator.h"
+#include "Node.h"
+#include "Volume.h"
+
+// constructor
+Entry::Entry(const char *name, Node *node, Directory *parent)
+	: fParent(parent),
+	  fNode(node),
+	  fName(name),
+	  fReferrerLink(),
+	  fIterators()
+{
+	if (node)
+		Link(node);
+}
+
+// destructor
+Entry::~Entry()
+{
+	if (fNode)
+		Unlink();
+}
+
+// InitCheck
+status_t
+Entry::InitCheck() const
+{
+	return (fName.GetString() ? B_OK : B_NO_INIT);
+}
+
+// Link
+status_t
+Entry::Link(Node *node)
+{
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// We first link to the new node and then unlink the old one. So, no
+		// harm is done, if both are the same.
+		Node *oldNode = fNode;
+		error = node->Link(this);
+		if (error == B_OK) {
+			fNode = node;
+			if (oldNode)
+				oldNode->Unlink(this);
+		}
+	}
+	return error;
+}
+
+// Unlink
+status_t
+Entry::Unlink()
+{
+	status_t error = (fNode ? B_OK : B_BAD_VALUE);
+	if (error == B_OK && (error = fNode->Unlink(this)) == B_OK)
+		fNode = NULL;
+	return error;
+}
+
+// SetName
+status_t
+Entry::SetName(const char *newName)
+{
+	status_t error = (newName ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (fName.SetTo(newName)) {
+//			if (fNode)
+//				fNode->MarkModified();
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// AttachEntryIterator
+void
+Entry::AttachEntryIterator(EntryIterator *iterator)
+{
+	if (iterator && iterator->GetCurrent() == this && !iterator->IsSuspended())
+		fIterators.Insert(iterator);
+}
+
+// DetachEntryIterator
+void
+Entry::DetachEntryIterator(EntryIterator *iterator)
+{
+	if (iterator && iterator->GetCurrent() == this && iterator->IsSuspended())
+		fIterators.Remove(iterator);
+}
+
+// GetAllocationInfo
+void
+Entry::GetAllocationInfo(AllocationInfo &info)
+{
+	info.AddEntryAllocation();
+	info.AddStringAllocation(fName.GetLength());
+	fNode->GetAllocationInfo(info);
+}
+

src/add-ons/kernel/file_systems/ramfs/Entry.h

@@ -0,0 +1,69 @@
+// Entry.h
+
+#ifndef ENTRY_H
+#define ENTRY_H
+
+#include <SupportDefs.h>
+
+#include "DLList.h"
+#include "fsproto.h"
+#include "String.h"
+
+class AllocationInfo;
+class Directory;
+class EntryIterator;
+class Node;
+
+class Entry : public DLListLinkImpl<Entry> {
+public:
+	Entry(const char *name, Node *node = NULL, Directory *parent = NULL);
+	~Entry();
+
+	status_t InitCheck() const;
+
+	inline void SetParent(Directory *parent)	{ fParent = parent; }
+	Directory *GetParent() const				{ return fParent; }
+
+//	inline void SetNode(Node *node)				{ fNode = node; }
+	status_t Link(Node *node);
+	status_t Unlink();
+	Node *GetNode() const						{ return fNode; }
+
+	status_t SetName(const char *newName);
+	inline const char *GetName() const			{ return fName.GetString(); }
+
+//	inline Volume *GetVolume() const			{ return fVolume; }
+	
+	inline DLListLink<Entry> *GetReferrerLink()	{ return &fReferrerLink; }
+
+	// entry iterator management
+	void AttachEntryIterator(EntryIterator *iterator);
+	void DetachEntryIterator(EntryIterator *iterator);
+	inline DLList<EntryIterator> *GetEntryIteratorList()
+		{ return &fIterators; }
+
+	// debugging
+	void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	Directory				*fParent;
+	Node					*fNode;
+	String					fName;
+	DLListLink<Entry>		fReferrerLink;
+	// iterator management
+	DLList<EntryIterator>	fIterators;
+};
+
+// GetNodeReferrerLink
+class GetNodeReferrerLink {
+private:
+	typedef DLListLink<Entry> Link;
+
+public:
+	inline Link *operator()(Entry *entry) const
+	{
+		return entry->GetReferrerLink();
+	}
+};
+
+#endif	// ENTRY_H

src/add-ons/kernel/file_systems/ramfs/EntryIterator.cpp

@@ -0,0 +1,137 @@
+// EntryIterator.cpp
+
+#include "Directory.h"
+#include "Entry.h"
+#include "EntryIterator.h"
+#include "Volume.h"
+
+// constructor
+EntryIterator::EntryIterator(Directory *directory)
+	: fDirectory(directory),
+	  fEntry(NULL),
+	  fSuspended(false),
+	  fIsNext(false),
+	  fDone(false)
+{
+}
+
+// destructor
+EntryIterator::~EntryIterator()
+{
+	Unset();
+}
+
+// SetTo
+status_t
+EntryIterator::SetTo(Directory *directory)
+{
+	Unset();
+	status_t error = (directory ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		fDirectory = directory;
+		fEntry = NULL;
+		fSuspended = false;
+		fIsNext = false;
+		fDone = false;
+	}
+	return error;
+}
+
+// Unset
+void
+EntryIterator::Unset()
+{
+	if (fDirectory && fSuspended)
+		Resume();
+	fDirectory = NULL;
+	fEntry = NULL;
+	fSuspended = false;
+	fIsNext = false;
+	fDone = false;
+}
+
+// Suspend
+status_t
+EntryIterator::Suspend()
+{
+	status_t error = (fDirectory ? B_OK : B_ERROR);
+	if (error == B_OK) {
+		if (fDirectory->GetVolume()->IteratorLock()) {
+			if (!fSuspended) {
+				if (fEntry)
+					fEntry->AttachEntryIterator(this);
+				fDirectory->GetVolume()->IteratorUnlock();
+				fSuspended = true;
+			} else
+				error = B_ERROR;
+		} else
+			error = B_ERROR;
+	}
+	return error;
+}
+
+// Resume
+status_t
+EntryIterator::Resume()
+{
+	status_t error = (fDirectory ? B_OK : B_ERROR);
+	if (error == B_OK) {
+		if (fDirectory->GetVolume()->IteratorLock()) {
+			if (fSuspended) {
+				if (fEntry)
+					fEntry->DetachEntryIterator(this);
+				fSuspended = false;
+			}
+			fDirectory->GetVolume()->IteratorUnlock();
+		} else
+			error = B_ERROR;
+	}
+	return error;
+}
+
+// GetNext
+status_t
+EntryIterator::GetNext(Entry **entry)
+{
+	status_t error = B_ENTRY_NOT_FOUND;
+	if (!fDone && fDirectory && entry) {
+		if (fIsNext) {
+			fIsNext = false;
+			if (fEntry)
+				error = B_OK;
+		} else
+			error = fDirectory->GetNextEntry(&fEntry);
+		*entry = fEntry;
+	}
+	fDone = (error != B_OK);
+	return error;
+}
+
+// Rewind
+status_t
+EntryIterator::Rewind()
+{
+	status_t error = (fDirectory ? B_OK : B_ERROR);
+	if (error == B_OK) {
+		if (fDirectory->GetVolume()->IteratorLock()) {
+			if (fSuspended && fEntry)
+				fEntry->DetachEntryIterator(this);
+			fEntry = NULL;
+			fIsNext = false;
+			fDone = false;
+			fDirectory->GetVolume()->IteratorUnlock();
+		} else
+			error = B_ERROR;
+	}
+	return error;
+}
+
+// SetCurrent
+void
+EntryIterator::SetCurrent(Entry *entry, bool isNext)
+{
+	fIsNext = isNext;
+	fEntry = entry;
+	fDone = !fEntry;
+}
+

src/add-ons/kernel/file_systems/ramfs/EntryIterator.h

@@ -0,0 +1,46 @@
+// EntryIterator.h
+
+#ifndef ENTRY_ITERATOR_H
+#define ENTRY_ITERATOR_H
+
+#include <SupportDefs.h>
+
+#include "DLList.h"
+
+class Directory;
+class Entry;
+
+class EntryIterator : public DLListLinkImpl<EntryIterator> {
+public:
+	EntryIterator(Directory *directory = NULL);
+	~EntryIterator();
+
+	status_t SetTo(Directory *directory);
+	void Unset();
+
+	Directory *GetDirectory() const { return fDirectory; }
+
+	status_t Suspend();
+	status_t Resume();
+	bool IsSuspended() const { return fSuspended; }
+
+	status_t GetNext(Entry **entry);
+	Entry *GetCurrent() const { return fEntry; }
+
+	status_t Rewind();
+
+private:
+	void SetCurrent(Entry *entry, bool isNext);
+
+private:
+	friend class Directory;
+
+private:
+	Directory					*fDirectory;
+	Entry						*fEntry;
+	bool						fSuspended;
+	bool						fIsNext;
+	bool						fDone;
+};
+
+#endif	// ENTRY_ITERATOR_H

src/add-ons/kernel/file_systems/ramfs/EntryListener.cpp

@@ -0,0 +1,26 @@
+// EntryListener.cpp
+
+#include "EntryListener.h"
+
+// constructor
+EntryListener::EntryListener()
+{
+}
+
+// destructor
+EntryListener::~EntryListener()
+{
+}
+
+// EntryAdded
+void
+EntryListener::EntryAdded(Entry */*entry*/)
+{
+}
+
+// EntryRemoved
+void
+EntryListener::EntryRemoved(Entry */*entry*/)
+{
+}
+

src/add-ons/kernel/file_systems/ramfs/EntryListener.h

@@ -0,0 +1,25 @@
+// EntryListener.h
+
+#ifndef ENTRY_LISTENER_H
+#define ENTRY_LISTENER_H
+
+class Entry;
+
+// listening flags
+enum {
+	ENTRY_LISTEN_ANY_ENTRY	= 0x01,
+	ENTRY_LISTEN_ADDED		= 0x02,
+	ENTRY_LISTEN_REMOVED	= 0x04,
+	ENTRY_LISTEN_ALL		= ENTRY_LISTEN_ADDED | ENTRY_LISTEN_REMOVED,
+};
+
+class EntryListener {
+public:
+	EntryListener();
+	virtual ~EntryListener();
+
+	virtual void EntryAdded(Entry *entry);
+	virtual void EntryRemoved(Entry *entry);
+};
+
+#endif	// ENTRY_LISTENER_H

src/add-ons/kernel/file_systems/ramfs/File.cpp

@@ -0,0 +1,75 @@
+// File.cpp
+
+#include "AllocationInfo.h"
+#include "File.h"
+#include "SizeIndex.h"
+#include "Volume.h"
+
+// constructor
+File::File(Volume *volume)
+	: Node(volume, NODE_TYPE_FILE),
+	  DataContainer(volume)
+{
+}
+
+// destructor
+File::~File()
+{
+}
+
+// ReadAt
+status_t
+File::ReadAt(off_t offset, void *buffer, size_t size, size_t *bytesRead)
+{
+	status_t error = DataContainer::ReadAt(offset, buffer, size, bytesRead);
+	// TODO: update access time?
+	return error;
+}
+
+// WriteAt
+status_t
+File::WriteAt(off_t offset, const void *buffer, size_t size,
+			  size_t *bytesWritten)
+{
+	off_t oldSize = DataContainer::GetSize();
+	status_t error = DataContainer::WriteAt(offset, buffer, size,
+											bytesWritten);
+	MarkModified();
+	// update the size index, if our size has changed
+	if (oldSize != DataContainer::GetSize()) {
+		if (SizeIndex *index = GetVolume()->GetSizeIndex())
+			index->Changed(this, oldSize);
+	}
+	return error;
+}
+
+// SetSize
+status_t
+File::SetSize(off_t newSize)
+{
+	status_t error = B_OK;
+	off_t oldSize = DataContainer::GetSize();
+	if (newSize != oldSize) {
+		error = DataContainer::Resize(newSize);
+		MarkModified();
+		// update the size index
+		if (SizeIndex *index = GetVolume()->GetSizeIndex())
+			index->Changed(this, oldSize);
+	}
+	return error;
+}
+
+// GetSize
+off_t
+File::GetSize() const
+{
+	return DataContainer::GetSize();
+}
+
+// GetAllocationInfo
+void
+File::GetAllocationInfo(AllocationInfo &info)
+{
+	info.AddFileAllocation(GetSize());
+}
+

src/add-ons/kernel/file_systems/ramfs/File.h

@@ -0,0 +1,28 @@
+// File.h
+
+#ifndef FILE_H
+#define FILE_H
+
+#include "DataContainer.h"
+#include "Node.h"
+
+class File : public Node, public DataContainer {
+public:
+	File(Volume *volume);
+	virtual ~File();
+
+	Volume *GetVolume() const	{ return Node::GetVolume(); }
+
+	virtual status_t ReadAt(off_t offset, void *buffer, size_t size,
+							size_t *bytesRead);
+	virtual status_t WriteAt(off_t offset, const void *buffer, size_t size,
+							 size_t *bytesWritten);
+
+	virtual status_t SetSize(off_t newSize);
+	virtual off_t GetSize() const;
+
+	// debugging
+	virtual void GetAllocationInfo(AllocationInfo &info);
+};
+
+#endif	// FILE_H

src/add-ons/kernel/file_systems/ramfs/Index.cpp

@@ -0,0 +1,192 @@
+// Index.cpp
+
+#include "Debug.h"
+#include "Directory.h"
+#include "Entry.h"
+#include "Index.h"
+#include "IndexImpl.h"
+
+// Index
+
+// constructor
+Index::Index(Volume *volume, const char *name, uint32 type,
+			 bool fixedKeyLength, size_t keyLength)
+	: fVolume(volume),
+	  fInitStatus(B_OK),
+	  fName(name),
+	  fType(type),
+	  fKeyLength(keyLength),
+	  fFixedKeyLength(fixedKeyLength)
+{
+	if (!fVolume)
+		fInitStatus = B_BAD_VALUE;
+	else if (!fName.GetString())
+		fInitStatus = B_NO_MEMORY;
+}
+
+// destructor
+Index::~Index()
+{
+}
+
+// InitCheck
+status_t
+Index::InitCheck() const
+{
+	return fInitStatus;
+}
+
+// GetIterator
+bool
+Index::GetIterator(IndexEntryIterator *iterator)
+{
+	bool result = false;
+	if (iterator) {
+		AbstractIndexEntryIterator *actualIterator = InternalGetIterator();
+		if (actualIterator) {
+			iterator->SetIterator(actualIterator);
+			result = true;
+		}
+	}
+	return result;
+}
+
+// Find
+bool
+Index::Find(const uint8 *key, size_t length, IndexEntryIterator *iterator)
+{
+	bool result = false;
+	if (key && iterator) {
+		AbstractIndexEntryIterator *actualIterator
+			= InternalFind(key, length);
+		if (actualIterator) {
+			iterator->SetIterator(actualIterator);
+			result = true;
+		}
+	}
+	return result;
+}
+
+// Dump
+void
+Index::Dump()
+{
+	PRINT(("Index: `%s', type: %lx\n", GetName(), GetType()));
+	for (IndexEntryIterator it(this); it.GetCurrent(); it.GetNext()) {
+		Entry *entry = it.GetCurrent();
+		PRINT(("  entry: `%s', dir: %Ld\n", entry->GetName(),
+											entry->GetParent()->GetID()));
+	}
+}
+
+
+// IndexEntryIterator
+
+// constructor
+IndexEntryIterator::IndexEntryIterator()
+	: fIterator(NULL)
+{
+}
+
+// constructor
+IndexEntryIterator::IndexEntryIterator(Index *index)
+	: fIterator(NULL)
+{
+	if (index)
+		index->GetIterator(this);
+}
+
+// destructor
+IndexEntryIterator::~IndexEntryIterator()
+{
+	SetIterator(NULL);
+}
+
+// GetCurrent
+Entry *
+IndexEntryIterator::GetCurrent()
+{
+	return (fIterator ? fIterator->GetCurrent() : NULL);
+}
+
+// GetCurrent
+Entry *
+IndexEntryIterator::GetCurrent(uint8 *buffer, size_t *keyLength)
+{
+	return (fIterator ? fIterator->GetCurrent(buffer, keyLength) : NULL);
+}
+
+// GetPrevious
+Entry *
+IndexEntryIterator::GetPrevious()
+{
+	return (fIterator ? fIterator->GetPrevious() : NULL);
+}
+
+// GetNext
+Entry *
+IndexEntryIterator::GetNext()
+{
+	return (fIterator ? fIterator->GetNext() : NULL);
+}
+
+// GetNext
+Entry *
+IndexEntryIterator::GetNext(uint8 *buffer, size_t *keyLength)
+{
+	Entry *entry = NULL;
+	if (fIterator && fIterator->GetNext())
+		entry = GetCurrent(buffer, keyLength);
+	return entry;
+}
+
+// Suspend
+status_t
+IndexEntryIterator::Suspend()
+{
+	return (fIterator ? fIterator->Suspend() : B_BAD_VALUE);
+}
+
+// Resume
+status_t
+IndexEntryIterator::Resume()
+{
+	return (fIterator ? fIterator->Resume() : B_BAD_VALUE);
+}
+
+// SetIterator
+void
+IndexEntryIterator::SetIterator(AbstractIndexEntryIterator *iterator)
+{
+	if (fIterator)
+		delete fIterator;
+	fIterator = iterator;
+}
+
+
+// AbstractIndexEntryIterator
+
+// constructor
+AbstractIndexEntryIterator::AbstractIndexEntryIterator()
+{
+}
+
+// destructor
+AbstractIndexEntryIterator::~AbstractIndexEntryIterator()
+{
+}
+
+// Suspend
+status_t
+AbstractIndexEntryIterator::Suspend()
+{
+	return B_OK;
+}
+
+// Resume
+status_t
+AbstractIndexEntryIterator::Resume()
+{
+	return B_OK;
+}
+

src/add-ons/kernel/file_systems/ramfs/Index.h

@@ -0,0 +1,81 @@
+// Index.h
+
+#ifndef INDEX_H
+#define INDEX_H
+
+#include <SupportDefs.h>
+
+#include "String.h"
+
+class AbstractIndexEntryIterator;
+class Entry;
+class IndexEntryIterator;
+class Node;
+class Volume;
+
+// Index
+class Index {
+public:
+	Index(Volume *volume, const char *name, uint32 type,
+		  bool fixedKeyLength, size_t keyLength = 0);
+	virtual ~Index();
+
+	status_t InitCheck() const;
+
+	Volume *GetVolume() const		{ return fVolume; }
+	void GetVolume(Volume *volume)	{ fVolume = volume; }
+
+	const char *GetName() const		{ return fName.GetString(); }
+	uint32 GetType() const			{ return fType; }
+	bool HasFixedKeyLength() const	{ return fFixedKeyLength; }
+	size_t GetKeyLength() const		{ return fKeyLength; }
+
+	virtual int32 CountEntries() const = 0;
+
+	bool GetIterator(IndexEntryIterator *iterator);
+	bool Find(const uint8 *key, size_t length,
+			  IndexEntryIterator *iterator);
+
+	// debugging
+	void Dump();
+
+protected:
+	virtual AbstractIndexEntryIterator *InternalGetIterator() = 0;
+	virtual AbstractIndexEntryIterator *InternalFind(const uint8 *key,
+													 size_t length) = 0;
+
+protected:
+	Volume		*fVolume;
+	status_t	fInitStatus;
+	String		fName;
+	uint32		fType;
+	size_t		fKeyLength;
+	bool		fFixedKeyLength;
+};
+
+// IndexEntryIterator
+class IndexEntryIterator {
+public:
+	IndexEntryIterator();
+	IndexEntryIterator(Index *index);
+	~IndexEntryIterator();
+
+	Entry *GetCurrent();
+	Entry *GetCurrent(uint8 *buffer, size_t *keyLength);
+	Entry *GetPrevious();
+	Entry *GetNext();
+	Entry *GetNext(uint8 *buffer, size_t *keyLength);
+
+	status_t Suspend();
+	status_t Resume();
+
+private:
+	void SetIterator(AbstractIndexEntryIterator *iterator);
+
+private:
+	friend class Index;
+
+	AbstractIndexEntryIterator	*fIterator;
+};
+
+#endif	// INDEX_H

src/add-ons/kernel/file_systems/ramfs/IndexDirectory.cpp

@@ -0,0 +1,204 @@
+// IndexDirectory.cpp
+
+#include <TypeConstants.h>
+
+#include "AttributeIndexImpl.h"
+#include "Debug.h"
+#include "IndexDirectory.h"
+#include "LastModifiedIndex.h"
+#include "NameIndex.h"
+#include "SizeIndex.h"
+
+// constructor
+IndexDirectory::IndexDirectory(Volume *volume)
+	: fVolume(volume),
+	  fNameIndex(NULL),
+	  fLastModifiedIndex(NULL),
+	  fSizeIndex(NULL),
+	  fIndices()
+{
+	fNameIndex = new(nothrow) NameIndex(volume);
+	fLastModifiedIndex = new(nothrow) LastModifiedIndex(volume);
+	fSizeIndex = new(nothrow) SizeIndex(volume);
+	if (fNameIndex && fLastModifiedIndex && fSizeIndex) {
+		if (!fIndices.AddItem(fNameIndex)
+			|| !fIndices.AddItem(fLastModifiedIndex)
+			|| !fIndices.AddItem(fSizeIndex)) {
+			fIndices.MakeEmpty();
+			delete fNameIndex;
+			delete fLastModifiedIndex;
+			delete fSizeIndex;
+			fNameIndex = NULL;
+			fLastModifiedIndex = NULL;
+			fSizeIndex = NULL;
+		}
+	}
+}
+
+// destructor
+IndexDirectory::~IndexDirectory()
+{
+	// delete the default indices
+	if (fNameIndex) {
+		fIndices.RemoveItem(fNameIndex);
+		delete fNameIndex;
+	}
+	if (fLastModifiedIndex) {
+		fIndices.RemoveItem(fLastModifiedIndex);
+		delete fLastModifiedIndex;
+	}
+	if (fSizeIndex) {
+		fIndices.RemoveItem(fSizeIndex);
+		delete fSizeIndex;
+	}
+	// delete the attribute indices
+	int32 count = fIndices.CountItems();
+	for (int i = 0; i < count; i++)
+		delete fIndices.ItemAt(i);
+}
+
+// InitCheck
+status_t
+IndexDirectory::InitCheck() const
+{
+	return (fNameIndex && fLastModifiedIndex && fSizeIndex ? B_OK 
+														   : B_NO_MEMORY);
+}
+
+// CreateIndex
+status_t
+IndexDirectory::CreateIndex(const char *name, uint32 type,
+							AttributeIndex **_index)
+{
+	status_t error = (name ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (!FindIndex(name)) {
+			// create the index
+			AttributeIndex *index = NULL;
+			switch (type) {
+				case B_INT32_TYPE:
+					index = new(nothrow) AttributeIndexImpl(fVolume,
+						name, type, sizeof(int32));
+					break;
+				case B_UINT32_TYPE:
+					index = new(nothrow) AttributeIndexImpl(fVolume,
+						name, type, sizeof(uint32));
+					break;
+				case B_INT64_TYPE:
+					index = new(nothrow) AttributeIndexImpl(fVolume,
+						name, type, sizeof(int64));
+					break;
+				case B_UINT64_TYPE:
+					index = new(nothrow) AttributeIndexImpl(fVolume,
+						name, type, sizeof(uint64));
+					break;
+				case B_FLOAT_TYPE:
+					index = new(nothrow) AttributeIndexImpl(fVolume,
+						name, type, sizeof(float));
+					break;
+				case B_DOUBLE_TYPE:
+					index = new(nothrow) AttributeIndexImpl(fVolume,
+						name, type, sizeof(double));
+					break;
+				case B_STRING_TYPE:
+					index = new(nothrow) AttributeIndexImpl(fVolume,
+						name, type, 0);
+					break;
+				default:
+					error = B_BAD_VALUE;
+					break;
+			}
+			if (error == B_OK && !index)
+				error = B_NO_MEMORY;
+			// add the index
+			if (error == B_OK) {
+				if (fIndices.AddItem(index)) {
+					if (_index)
+						*_index = index;
+				} else {
+					delete index;
+					error = B_NO_MEMORY;
+				}
+			}
+		} else
+			error = B_FILE_EXISTS;
+	}
+	return error;
+}
+
+// DeleteIndex
+bool
+IndexDirectory::DeleteIndex(const char *name, uint32 type)
+{
+	return DeleteIndex(FindIndex(name, type));
+}
+
+// DeleteIndex
+bool
+IndexDirectory::DeleteIndex(Index *index)
+{
+	bool result = false;
+	if (index && !IsSpecialIndex(index)) {
+		int32 i = fIndices.IndexOf(index);
+		if (i >= 0) {
+			fIndices.RemoveItem(i);
+			delete index;
+			result = true;
+		}
+	}
+	return result;
+}
+
+// FindIndex
+Index *
+IndexDirectory::FindIndex(const char *name)
+{
+	if (name) {
+		int32 count = fIndices.CountItems();
+		for (int32 i = 0; i < count; i++) {
+			Index *index = fIndices.ItemAt(i);
+			if (!strcmp(index->GetName(), name))
+				return index;
+		}
+	}
+	return NULL;
+}
+
+// FindIndex
+Index *
+IndexDirectory::FindIndex(const char *name, uint32 type)
+{
+	Index *index = FindIndex(name);
+	if (index && index->GetType() != type)
+		index = NULL;
+	return index;
+}
+
+// FindAttributeIndex
+AttributeIndex *
+IndexDirectory::FindAttributeIndex(const char *name)
+{
+	AttributeIndex *attrIndex = NULL;
+	if (Index *index = FindIndex(name))
+		attrIndex = dynamic_cast<AttributeIndex*>(index);
+	return attrIndex;
+}
+
+// FindAttributeIndex
+AttributeIndex *
+IndexDirectory::FindAttributeIndex(const char *name, uint32 type)
+{
+	AttributeIndex *attrIndex = NULL;
+	if (Index *index = FindIndex(name, type))
+		attrIndex = dynamic_cast<AttributeIndex*>(index);
+	return attrIndex;
+}
+
+// IsSpecialIndex
+bool
+IndexDirectory::IsSpecialIndex(Index *index) const
+{
+	return (index == fNameIndex || index == fLastModifiedIndex
+			|| index == fSizeIndex);
+}
+

src/add-ons/kernel/file_systems/ramfs/IndexDirectory.h

@@ -0,0 +1,48 @@
+// IndexDirectory.h
+
+#ifndef INDEX_DIRECTORY_H
+#define INDEX_DIRECTORY_H
+
+#include "List.h"
+
+class AttributeIndex;
+class Index;
+class LastModifiedIndex;
+class NameIndex;
+class SizeIndex;
+class Volume;
+
+class IndexDirectory {
+public:
+	IndexDirectory(Volume *volume);
+	~IndexDirectory();
+
+	status_t InitCheck() const;
+
+	status_t CreateIndex(const char *name, uint32 type,
+						 AttributeIndex **index = NULL);
+	bool DeleteIndex(const char *name, uint32 type);
+	bool DeleteIndex(Index *index);
+
+	Index *FindIndex(const char *name);
+	Index *FindIndex(const char *name, uint32 type);
+	AttributeIndex *FindAttributeIndex(const char *name);
+	AttributeIndex *FindAttributeIndex(const char *name, uint32 type);
+
+	bool IsSpecialIndex(Index *index) const;
+	NameIndex *GetNameIndex() const			{ return fNameIndex; }
+	LastModifiedIndex *GetLastModifiedIndex() const
+		{ return fLastModifiedIndex; }
+	SizeIndex *GetSizeIndex() const			{ return fSizeIndex; }
+
+	Index *IndexAt(int32 index) const	{ return fIndices.ItemAt(index); }
+
+private:
+	Volume				*fVolume;
+	NameIndex			*fNameIndex;
+	LastModifiedIndex	*fLastModifiedIndex;
+	SizeIndex			*fSizeIndex;
+	List<Index*>		fIndices;
+};
+
+#endif	// INDEX_DIRECTORY_H

src/add-ons/kernel/file_systems/ramfs/IndexImpl.h

@@ -0,0 +1,148 @@
+// IndexImpl.h
+
+#ifndef INDEX_IMPL_H
+#define INDEX_IMPL_H
+
+#include "Index.h"
+#include "Node.h"
+
+// AbstractIndexEntryIterator
+class AbstractIndexEntryIterator {
+public:
+	AbstractIndexEntryIterator();
+	virtual ~AbstractIndexEntryIterator();
+
+	virtual Entry *GetCurrent() = 0;
+	virtual Entry *GetCurrent(uint8 *buffer, size_t *keyLength) = 0;
+	virtual Entry *GetPrevious() = 0;
+	virtual Entry *GetNext() = 0;
+
+	virtual status_t Suspend();
+	virtual status_t Resume();
+};
+
+
+// NodeEntryIterator
+template<typename NodeIterator>
+class NodeEntryIterator : public AbstractIndexEntryIterator {
+public:
+	NodeEntryIterator();
+	virtual ~NodeEntryIterator();
+
+	void Unset();
+
+	virtual Entry *GetCurrent();
+	virtual Entry *GetCurrent(uint8 *buffer, size_t *keyLength) = 0;
+	virtual Entry *GetPrevious();
+	virtual Entry *GetNext();
+
+	virtual status_t Suspend();
+	virtual status_t Resume();
+
+	Node *GetCurrentNode() const			{ return fNode; }
+
+protected:
+	NodeIterator	fIterator;
+	Node			*fNode;
+	Entry			*fEntry;
+	bool			fInitialized;
+	bool			fIsNext;
+	bool			fSuspended;
+};
+
+// constructor
+template<typename NodeIterator>
+NodeEntryIterator<NodeIterator>::NodeEntryIterator()
+	: AbstractIndexEntryIterator(),
+	  fIterator(),
+	  fNode(NULL),
+	  fEntry(NULL),
+	  fInitialized(false),
+	  fIsNext(false),
+	  fSuspended(false)
+{
+}
+
+// destructor
+template<typename NodeIterator>
+NodeEntryIterator<NodeIterator>::~NodeEntryIterator()
+{
+}
+
+// Unset
+template<typename NodeIterator>
+void
+NodeEntryIterator<NodeIterator>::Unset()
+{
+	fNode = NULL;
+	fEntry = NULL;
+	fInitialized = false;
+	fIsNext = false;
+	fSuspended = false;
+}
+
+// GetCurrent
+template<typename NodeIterator>
+Entry *
+NodeEntryIterator<NodeIterator>::GetCurrent()
+{
+	return fEntry;
+}
+
+// GetPrevious
+template<typename NodeIterator>
+Entry *
+NodeEntryIterator<NodeIterator>::GetPrevious()
+{
+	return NULL;	// backwards iteration not implemented
+}
+
+// GetNext
+template<typename NodeIterator>
+Entry *
+NodeEntryIterator<NodeIterator>::GetNext()
+{
+	if (!fInitialized || !fNode || fSuspended)
+		return NULL;
+	if (!(fEntry && fIsNext)) {
+		while (fNode) {
+			if (fEntry)
+				fEntry = fNode->GetNextReferrer(fEntry);
+			while (fNode && !fEntry) {
+				fNode = NULL;
+				if (Node **nodeP = fIterator.GetNext()) {
+					fNode = *nodeP;
+					fEntry = fNode->GetFirstReferrer();
+				}
+			}
+			if (fEntry)
+				break;
+		}
+	}
+	fIsNext = false;
+	return fEntry;
+}
+
+// Suspend
+template<typename NodeIterator>
+status_t
+NodeEntryIterator<NodeIterator>::Suspend()
+{
+	status_t error = (fInitialized && !fSuspended ? B_OK : B_BAD_VALUE);
+	if (error == B_OK)
+		fSuspended = true;
+	return error;
+}
+
+// Resume
+template<typename NodeIterator>
+status_t
+NodeEntryIterator<NodeIterator>::Resume()
+{
+	status_t error = (fInitialized && fSuspended ? B_OK : B_BAD_VALUE);
+	if (error == B_OK)
+		fSuspended = false;
+	return error;
+}
+
+#endif	// INDEX_IMPL_H

src/add-ons/kernel/file_systems/ramfs/Jamfile

@@ -0,0 +1,62 @@
+SubDir HAIKU_TOP src tests add-ons kernel file_systems userlandfs r5 src test
+	ramfs ;
+
+SetSubDirSupportedPlatforms r5 bone dano ;
+
+local userlandFSTop = [ FDirName $(HAIKU_TOP) src tests add-ons kernel
+	file_systems userlandfs r5 ] ;
+local userlandFSIncludes = [ FDirName $(userlandFSTop) headers ] ;
+
+DEFINES += USER=1 ;
+
+SubDirC++Flags -include
+	[ FDirName $(userlandFSIncludes) shared Compatibility.h ] ;
+
+SubDirSysHdrs [ FDirName $(userlandFSIncludes) public ] ;
+SubDirHdrs [ FDirName $(userlandFSIncludes) shared ] ;
+
+if $(OSPLAT) = X86 {
+#	SubDirC++Flags -include [ FDirName $(UFS_TOP) src kernel_add_on
+#		kernel-cpp.h ] ;
+	SubDirC++Flags -include [ FDirName $(SUBDIR) cpp.h ] ;
+}
+
+SEARCH_SOURCE += [ FDirName $(userlandFSTop) src shared ] ;
+
+Addon <test>ramfs
+	: # relpath - obsolete
+	: Debug.cpp
+	  Locker.cpp
+	  String.cpp
+
+	  AllocationInfo.cpp
+	  AreaUtils.cpp
+	  Attribute.cpp
+	  AttributeIndex.cpp
+	  AttributeIndexImpl.cpp
+	  AttributeIterator.cpp
+	  BlockAllocator.cpp
+	  BlockAllocatorArea.cpp
+	  BlockAllocatorAreaBucket.cpp
+	  BlockReferenceManager.cpp
+	  DataContainer.cpp
+	  Directory.cpp
+	  Entry.cpp
+	  EntryIterator.cpp
+	  EntryListener.cpp
+	  File.cpp
+	  Index.cpp
+	  IndexDirectory.cpp
+	  kernel_interface.cpp
+	  LastModifiedIndex.cpp
+	  NameIndex.cpp
+	  Node.cpp
+	  NodeListener.cpp
+	  NodeTable.cpp
+	  Query.cpp
+	  SizeIndex.cpp
+	  SymLink.cpp
+	  Volume.cpp
+	: false		# is executable
+	: <test>UserlandFSServer
+;

src/add-ons/kernel/file_systems/ramfs/LastModifiedIndex.cpp

@@ -0,0 +1,373 @@
+// LastModifiedIndex.cpp
+
+#include <TypeConstants.h>
+
+#include "Debug.h"
+#include "Entry.h"
+#include "EntryListener.h"
+#include "IndexImpl.h"
+#include "LastModifiedIndex.h"
+#include "Node.h"
+#include "NodeListener.h"
+#include "Volume.h"
+
+// LastModifiedIndexPrimaryKey
+class LastModifiedIndexPrimaryKey {
+public:
+	LastModifiedIndexPrimaryKey(Node *node, time_t modified)
+		: node(node), modified(modified) {}
+	LastModifiedIndexPrimaryKey(Node *node)
+		: node(node), modified(node->GetMTime()) {}
+	LastModifiedIndexPrimaryKey(time_t modified)
+		: node(NULL), modified(modified) {}
+
+	Node	*node;
+	time_t	modified;
+};
+
+// LastModifiedIndexGetPrimaryKey
+class LastModifiedIndexGetPrimaryKey {
+public:
+	inline LastModifiedIndexPrimaryKey operator()(Node *a)
+	{
+		return LastModifiedIndexPrimaryKey(a);
+	}
+
+	inline LastModifiedIndexPrimaryKey operator()(Node *a) const
+	{
+		return LastModifiedIndexPrimaryKey(a);
+	}
+};
+
+// LastModifiedIndexPrimaryKeyCompare
+class LastModifiedIndexPrimaryKeyCompare
+{
+public:
+	inline int operator()(const LastModifiedIndexPrimaryKey &a,
+						  const LastModifiedIndexPrimaryKey &b) const
+	{
+		if (a.node != NULL && a.node == b.node)
+			return 0;
+		if (a.modified < b.modified)
+			return -1;
+		if (a.modified > b.modified)
+			return 1;
+		return 0;
+	}
+};
+
+
+// NodeTree
+typedef TwoKeyAVLTree<Node*, LastModifiedIndexPrimaryKey,
+					  LastModifiedIndexPrimaryKeyCompare,
+					  LastModifiedIndexGetPrimaryKey>
+		_NodeTree;
+class LastModifiedIndex::NodeTree : public _NodeTree {};
+
+
+// IteratorList
+class LastModifiedIndex::IteratorList : public DLList<Iterator> {};
+
+
+// Iterator
+class LastModifiedIndex::Iterator
+	: public NodeEntryIterator<LastModifiedIndex::NodeTree::Iterator>,
+	  public DLListLinkImpl<Iterator>, public EntryListener,
+	  public NodeListener {
+public:
+	Iterator();
+	virtual ~Iterator();
+
+	virtual Entry *GetCurrent();
+	virtual Entry *GetCurrent(uint8 *buffer, size_t *keyLength);
+
+	virtual status_t Suspend();
+	virtual status_t Resume();
+
+	bool SetTo(LastModifiedIndex *index, time_t modified,
+			   bool ignoreValue = false);
+	void Unset();
+
+	virtual void EntryRemoved(Entry *entry);
+	virtual void NodeRemoved(Node *node);
+
+private:
+	typedef NodeEntryIterator<LastModifiedIndex::NodeTree::Iterator> BaseClass;
+
+private:
+	LastModifiedIndex						*fIndex;
+};
+
+
+// LastModifiedIndex
+
+// constructor
+LastModifiedIndex::LastModifiedIndex(Volume *volume)
+	: Index(volume, "last_modified", B_INT32_TYPE, true, sizeof(time_t)),
+	  fNodes(new(nothrow) NodeTree),
+	  fIterators(new(nothrow) IteratorList)
+{
+	if (fInitStatus == B_OK && (!fNodes || !fIterators))
+		fInitStatus = B_NO_MEMORY;
+	if (fInitStatus == B_OK) {
+		fInitStatus = fVolume->AddNodeListener(this,
+			NULL, NODE_LISTEN_ANY_NODE | NODE_LISTEN_ALL);
+	}
+}
+
+// destructor
+LastModifiedIndex::~LastModifiedIndex()
+{
+	if (fVolume)
+		fVolume->RemoveNodeListener(this, NULL);
+	if (fIterators) {
+		// unset the iterators
+		for (Iterator *iterator = fIterators->GetFirst();
+			 iterator;
+			 iterator = fIterators->GetNext(iterator)) {
+			iterator->SetTo(NULL, 0);
+		}
+		delete fIterators;
+	}
+	if (fNodes)
+		delete fNodes;
+}
+
+// CountEntries
+int32
+LastModifiedIndex::CountEntries() const
+{
+	return fNodes->CountItems();
+}
+
+// Changed
+status_t
+LastModifiedIndex::Changed(Node *node, time_t oldModified)
+{
+	status_t error = B_BAD_VALUE;
+	if (node) {
+		NodeTree::Iterator it;
+		Node **foundNode = fNodes->Find(LastModifiedIndexPrimaryKey(node,
+			oldModified), node, &it);
+		if (foundNode && *foundNode == node) {
+			// update the iterators
+			for (Iterator *iterator = fIterators->GetFirst();
+				 iterator;
+				 iterator = fIterators->GetNext(iterator)) {
+				if (iterator->GetCurrentNode() == node)
+					iterator->NodeRemoved(node);
+			}
+			// remove and re-insert the node
+			fNodes->Remove(it);
+			error = fNodes->Insert(node);
+
+			// udpate live queries
+			time_t newModified = node->GetMTime();
+			fVolume->UpdateLiveQueries(NULL, node, GetName(), GetType(),
+				(const uint8*)&oldModified, sizeof(oldModified),
+				(const uint8*)&newModified, sizeof(newModified));
+		}
+	}
+	return error;
+}
+
+// NodeAdded
+void
+LastModifiedIndex::NodeAdded(Node *node)
+{
+	if (node)
+		fNodes->Insert(node);
+}
+
+// NodeRemoved
+void
+LastModifiedIndex::NodeRemoved(Node *node)
+{
+	if (node)
+		fNodes->Remove(node, node);
+}
+
+// InternalGetIterator
+AbstractIndexEntryIterator *
+LastModifiedIndex::InternalGetIterator()
+{
+	Iterator *iterator = new(nothrow) Iterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, 0, true)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// InternalFind
+AbstractIndexEntryIterator *
+LastModifiedIndex::InternalFind(const uint8 *key, size_t length)
+{
+	if (!key || length != sizeof(time_t))
+		return NULL;
+	Iterator *iterator = new(nothrow) Iterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, *(const time_t*)key)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// _AddIterator
+void
+LastModifiedIndex::_AddIterator(Iterator *iterator)
+{
+	fIterators->Insert(iterator);
+}
+
+// _RemoveIterator
+void
+LastModifiedIndex::_RemoveIterator(Iterator *iterator)
+{
+	fIterators->Remove(iterator);
+}
+
+
+// Iterator
+
+// constructor
+LastModifiedIndex::Iterator::Iterator()
+	: BaseClass(),
+	  fIndex(NULL)
+{
+}
+
+// destructor
+LastModifiedIndex::Iterator::~Iterator()
+{
+	SetTo(NULL, 0);
+}
+
+// GetCurrent
+Entry *
+LastModifiedIndex::Iterator::GetCurrent()
+{
+	return BaseClass::GetCurrent();
+}
+
+// GetCurrent
+Entry *
+LastModifiedIndex::Iterator::GetCurrent(uint8 *buffer, size_t *keyLength)
+{
+	Entry *entry = GetCurrent();
+	if (entry) {
+		*(time_t*)buffer = entry->GetNode()->GetMTime();
+		*keyLength = sizeof(time_t);
+	}
+	return entry;
+}
+
+// Suspend
+status_t
+LastModifiedIndex::Iterator::Suspend()
+{
+	status_t error = BaseClass::Suspend();
+	if (error == B_OK) {
+		if (fNode) {
+			error = fIndex->GetVolume()->AddNodeListener(this, fNode,
+														 NODE_LISTEN_REMOVED);
+			if (error == B_OK && fEntry) {
+				error = fIndex->GetVolume()->AddEntryListener(this, fEntry,
+					ENTRY_LISTEN_REMOVED);
+				if (error != B_OK)
+					fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+			}
+			if (error != B_OK)
+				BaseClass::Resume();
+		}
+	}
+	return error;
+}
+
+// Resume
+status_t
+LastModifiedIndex::Iterator::Resume()
+{
+	status_t error = BaseClass::Resume();
+	if (error == B_OK) {
+		if (fEntry)
+			error = fIndex->GetVolume()->RemoveEntryListener(this, fEntry);
+		if (fNode) {
+			if (error == B_OK)
+				error = fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+			else
+				fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+		}
+	}
+	return error;
+}
+
+// SetTo
+bool
+LastModifiedIndex::Iterator::SetTo(LastModifiedIndex *index, time_t modified,
+								   bool ignoreValue)
+{
+	Resume();
+	Unset();
+	// set the new values
+	fIndex = index;
+	if (fIndex)
+		fIndex->_AddIterator(this);
+	fInitialized = fIndex;
+	// get the node's first entry
+	if (fIndex) {
+		// get the first node
+		bool found = true;
+		if (ignoreValue)
+			fIndex->fNodes->GetIterator(&fIterator);
+		else
+			found = fIndex->fNodes->FindFirst(modified, &fIterator);
+		// get the first entry
+		if (found) {
+			if (Node **nodeP = fIterator.GetCurrent()) {
+				fNode = *nodeP;
+				fEntry = fNode->GetFirstReferrer();
+				if (!fEntry)
+					BaseClass::GetNext();
+				if (!ignoreValue && fNode && fNode->GetMTime() != modified)
+					Unset();
+			}
+		}
+	}
+	return fEntry;
+}
+
+// Unset
+void
+LastModifiedIndex::Iterator::Unset()
+{
+	if (fIndex) {
+		fIndex->_RemoveIterator(this);
+		fIndex = NULL;
+	}
+	BaseClass::Unset();
+}
+
+// EntryRemoved
+void
+LastModifiedIndex::Iterator::EntryRemoved(Entry */*entry*/)
+{
+	Resume();
+	fIsNext = BaseClass::GetNext();
+	Suspend();
+}
+
+// NodeRemoved
+void
+LastModifiedIndex::Iterator::NodeRemoved(Node */*node*/)
+{
+	Resume();
+	fEntry = NULL;
+	fIsNext = BaseClass::GetNext();
+	Suspend();
+}
+

src/add-ons/kernel/file_systems/ramfs/LastModifiedIndex.h

@@ -0,0 +1,44 @@
+// LastModifiedIndex.h
+
+#ifndef LAST_MODIFIED_INDEX_H
+#define LAST_MODIFIED_INDEX_H
+
+#include "Index.h"
+#include "NodeListener.h"
+#include "TwoKeyAVLTree.h"
+
+// LastModifiedIndex
+class LastModifiedIndex : public Index, private NodeListener {
+public:
+	LastModifiedIndex(Volume *volume);
+	virtual ~LastModifiedIndex();
+
+	virtual int32 CountEntries() const;
+
+	virtual status_t Changed(Node *node, time_t oldModified);
+
+private:
+	virtual void NodeAdded(Node *node);
+	virtual void NodeRemoved(Node *node);
+
+protected:
+	virtual AbstractIndexEntryIterator *InternalGetIterator();
+	virtual AbstractIndexEntryIterator *InternalFind(const uint8 *key,
+													 size_t length);
+
+private:
+	class Iterator;
+	class IteratorList;
+	class NodeTree;
+	friend class Iterator;
+
+private:
+	void _AddIterator(Iterator *iterator);
+	void _RemoveIterator(Iterator *iterator);
+
+private:
+	NodeTree		*fNodes;
+	IteratorList	*fIterators;
+};
+
+#endif	// LAST_MODIFIED_INDEX_H

src/add-ons/kernel/file_systems/ramfs/List.h

@@ -0,0 +1,385 @@
+// List.h
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+// 
+// Except as contained in this notice, the name of a copyright holder shall
+// not be used in advertising or otherwise to promote the sale, use or other
+// dealings in this Software without prior written authorization of the
+// copyright holder.
+
+#ifndef LIST_H
+#define LIST_H
+
+#include <new.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <SupportDefs.h>
+
+template<typename ITEM>
+class DefaultDefaultItemCreator {
+public:
+	static inline ITEM GetItem() { return ITEM(0); }
+};
+
+/*!
+	\class List
+	\brief A generic list implementation.
+*/
+template<typename ITEM,
+		 typename DEFAULT_ITEM_SUPPLIER = DefaultDefaultItemCreator<ITEM> >
+class List {
+public:
+	typedef ITEM					item_t;
+	typedef List					list_t;
+
+private:
+	static item_t					sDefaultItem;
+	static const size_t				kDefaultChunkSize = 10;
+	static const size_t				kMaximalChunkSize = 1024 * 1024;
+
+public:
+	List(size_t chunkSize = kDefaultChunkSize);
+	~List();
+
+	inline const item_t &GetDefaultItem() const;
+	inline item_t &GetDefaultItem();
+
+	bool AddItem(const item_t &item, int32 index);
+	bool AddItem(const item_t &item);
+//	bool AddList(list_t *list, int32 index);
+//	bool AddList(list_t *list);
+
+	bool RemoveItem(const item_t &item);
+	bool RemoveItem(int32 index);
+
+	bool ReplaceItem(int32 index, const item_t &item);
+
+	bool MoveItem(int32 oldIndex, int32 newIndex);
+
+	void MakeEmpty();
+
+	int32 CountItems() const;
+	bool IsEmpty() const;
+	const item_t &ItemAt(int32 index) const;
+	item_t &ItemAt(int32 index);
+	const item_t *Items() const;
+	int32 IndexOf(const item_t &item) const;
+	bool HasItem(const item_t &item) const;
+
+	// debugging
+	int32 GetCapacity() const	{ return fCapacity; }
+
+private:
+	inline static void _MoveItems(item_t* items, int32 offset, int32 count);
+	bool _Resize(size_t count);
+
+private:
+	size_t	fCapacity;
+	size_t	fChunkSize;
+	int32	fItemCount;
+	item_t	*fItems;
+};
+
+// sDefaultItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::item_t
+	List<ITEM, DEFAULT_ITEM_SUPPLIER>::sDefaultItem(
+		DEFAULT_ITEM_SUPPLIER::GetItem());
+
+// constructor
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::List(size_t chunkSize)
+	: fCapacity(0),
+	  fChunkSize(chunkSize),
+	  fItemCount(0),
+	  fItems(NULL)
+{
+	if (fChunkSize == 0 || fChunkSize > kMaximalChunkSize)
+		fChunkSize = kDefaultChunkSize;
+	_Resize(0);
+}
+
+// destructor
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::~List()
+{
+	MakeEmpty();
+	free(fItems);
+}
+
+// GetDefaultItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+inline
+const List<ITEM, DEFAULT_ITEM_SUPPLIER>::item_t &
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::GetDefaultItem() const
+{
+	return sDefaultItem;
+}
+
+// GetDefaultItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+inline
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::item_t &
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::GetDefaultItem()
+{
+	return sDefaultItem;
+}
+
+// _MoveItems
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+inline
+void
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::_MoveItems(item_t* items, int32 offset, int32 count)
+{
+	if (count > 0 && offset != 0)
+		memmove(items + offset, items, count * sizeof(item_t));
+}
+
+// AddItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::AddItem(const item_t &item, int32 index)
+{
+	bool result = (index >= 0 && index <= fItemCount
+				   && _Resize(fItemCount + 1));
+	if (result) {
+		_MoveItems(fItems + index, 1, fItemCount - index - 1);
+		new(fItems + index) item_t(item);
+	}
+	return result;
+}
+
+// AddItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::AddItem(const item_t &item)
+{
+	bool result = true;
+	if ((int32)fCapacity > fItemCount) {
+		new(fItems + fItemCount) item_t(item);
+		fItemCount++;
+	} else {
+		if ((result = _Resize(fItemCount + 1)))
+			new(fItems + (fItemCount - 1)) item_t(item);
+	}
+	return result;
+}
+
+// These don't use the copy constructor!
+/*
+// AddList
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::AddList(list_t *list, int32 index)
+{
+	bool result = (list && index >= 0 && index <= fItemCount);
+	if (result && list->fItemCount > 0) {
+		int32 count = list->fItemCount;
+		result = _Resize(fItemCount + count);
+		if (result) {
+			_MoveItems(fItems + index, count, fItemCount - index - count);
+			memcpy(fItems + index, list->fItems,
+				   list->fItemCount * sizeof(item_t));
+		}
+	}
+	return result;
+}
+
+// AddList
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::AddList(list_t *list)
+{
+	bool result = (list);
+	if (result && list->fItemCount > 0) {
+		int32 index = fItemCount;
+		int32 count = list->fItemCount;
+		result = _Resize(fItemCount + count);
+		if (result) {
+			memcpy(fItems + index, list->fItems,
+				   list->fItemCount * sizeof(item_t));
+		}
+	}
+	return result;
+}
+*/
+
+// RemoveItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::RemoveItem(const item_t &item)
+{
+	int32 index = IndexOf(item);
+	bool result = (index >= 0);
+	if (result)
+		RemoveItem(index);
+	return result;
+}
+
+// RemoveItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::RemoveItem(int32 index)
+{
+	if (index >= 0 && index < fItemCount) {
+		fItems[index].~item_t();
+		_MoveItems(fItems + index + 1, -1, fItemCount - index - 1);
+		_Resize(fItemCount - 1);
+		return true;
+	}
+	return false;
+}
+
+// ReplaceItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::ReplaceItem(int32 index, const item_t &item)
+{
+	if (index >= 0 && index < fItemCount) {
+		fItems[index] = item;
+		return true;
+	}
+	return false;
+}
+
+// MoveItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::MoveItem(int32 oldIndex, int32 newIndex)
+{
+	if (oldIndex >= 0 && oldIndex < fItemCount
+		&& newIndex >= 0 && newIndex <= fItemCount) {
+		if (oldIndex < newIndex - 1) {
+			item_t item = fItems[oldIndex];
+			_MoveItems(fItems + oldIndex + 1, -1, newIndex - oldIndex - 1);
+			fItems[newIndex] = item;
+		} else if (oldIndex > newIndex) {
+			item_t item = fItems[oldIndex];
+			_MoveItems(fItems + newIndex, 1, oldIndex - newIndex);
+			fItems[newIndex] = item;
+		}
+		return true;
+	}
+	return false;
+}
+
+// MakeEmpty
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+void
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::MakeEmpty()
+{
+	for (int32 i = 0; i < fItemCount; i++)
+		fItems[i].~item_t();
+	_Resize(0);
+}
+
+// CountItems
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+int32
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::CountItems() const
+{
+	return fItemCount;
+}
+
+// IsEmpty
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::IsEmpty() const
+{
+	return (fItemCount == 0);
+}
+
+// ItemAt
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+const List<ITEM, DEFAULT_ITEM_SUPPLIER>::item_t &
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::ItemAt(int32 index) const
+{
+	if (index >= 0 && index < fItemCount)
+		return fItems[index];
+	return sDefaultItem;
+}
+
+// ItemAt
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::item_t &
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::ItemAt(int32 index)
+{
+	if (index >= 0 && index < fItemCount)
+		return fItems[index];
+	return sDefaultItem;
+}
+
+// Items
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+const List<ITEM, DEFAULT_ITEM_SUPPLIER>::item_t *
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::Items() const
+{
+	return fItems;
+}
+
+// IndexOf
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+int32
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::IndexOf(const item_t &item) const
+{
+	for (int32 i = 0; i < fItemCount; i++) {
+		if (fItems[i] == item)
+			return i;
+	}
+	return -1;
+}
+
+// HasItem
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::HasItem(const item_t &item) const
+{
+	return (IndexOf(item) >= 0);
+}
+
+// _Resize
+template<typename ITEM, typename DEFAULT_ITEM_SUPPLIER>
+bool
+List<ITEM, DEFAULT_ITEM_SUPPLIER>::_Resize(size_t count)
+{
+	bool result = true;
+	// calculate the new capacity
+	int32 newSize = count;
+	if (newSize <= 0)
+		newSize = 1;
+	newSize = ((newSize - 1) / fChunkSize + 1) * fChunkSize;
+	// resize if necessary
+	if ((size_t)newSize != fCapacity) {
+		item_t* newItems
+			= (item_t*)realloc(fItems, newSize * sizeof(item_t));
+		if (newItems) {
+			fItems = newItems;
+			fCapacity = newSize;
+		} else
+			result = false;
+	}
+	if (result)
+		fItemCount = count;
+	return result;
+}
+
+#endif	// LIST_H

src/add-ons/kernel/file_systems/ramfs/Locking.h

@@ -0,0 +1,14 @@
+// Locking.h
+
+#ifndef LOCKING_H
+#define LOCKING_H
+
+#include "AutoLocker.h"
+
+class Volume;
+
+// instantiations
+typedef AutoLocker<Volume, AutoLockerReadLocking<Volume> >	VolumeReadLocker;
+typedef AutoLocker<Volume, AutoLockerWriteLocking<Volume> >	VolumeWriteLocker;
+
+#endif LOCKING_H

src/add-ons/kernel/file_systems/ramfs/Misc.h

@@ -0,0 +1,107 @@
+// Misc.h
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+// 
+// Except as contained in this notice, the name of a copyright holder shall
+// not be used in advertising or otherwise to promote the sale, use or other
+// dealings in this Software without prior written authorization of the
+// copyright holder.
+
+#ifndef MISC_H
+#define MISC_H
+
+#include <SupportDefs.h>
+
+#include "String.h"
+
+// min and max
+// We don't want to include <algobase.h> otherwise we also get <iostream.h>
+// and other undesired things.
+template<typename C>
+static inline C min(const C &a, const C &b) { return (a < b ? a : b); }
+template<typename C>
+static inline C max(const C &a, const C &b) { return (a > b ? a : b); }
+
+// find last (most significant) set bit
+static inline
+int
+fls(uint32 value)
+{
+	if (!value)
+		return -1;
+	int index = 0;
+#define HAND_OPTIMIZED_FLS	1
+#if !HAND_OPTIMIZED_FLS
+// This is the algorithm in its pure form.
+	const uint32 masks[] = {
+		0xffff0000,
+		0xff00ff00,
+		0xf0f0f0f0,
+		0xcccccccc,
+		0xaaaaaaaa,
+	};
+	int range = 16;
+	for (int i = 0; i < 5; i++) {
+		if (value & masks[i]) {
+			index += range;
+			value &= masks[i];
+		}
+		range /= 2;
+	}
+#else	// HAND_OPTIMIZED_FLS
+// This is how the compiler should optimize it for us: Unroll the loop and
+// inline the masks.
+	// 0: 0xffff0000
+	if (value & 0xffff0000) {
+		index += 16;
+		value &= 0xffff0000;
+	}
+	// 1: 0xff00ff00
+	if (value & 0xff00ff00) {
+		index += 8;
+		value &= 0xff00ff00;
+	}
+	// 2: 0xf0f0f0f0
+	if (value & 0xf0f0f0f0) {
+		index += 4;
+		value &= 0xf0f0f0f0;
+	}
+	// 3: 0xcccccccc
+	if (value & 0xcccccccc) {
+		index += 2;
+		value &= 0xcccccccc;
+	}
+	// 4: 0xaaaaaaaa
+	if (value & 0xaaaaaaaa)
+		index++;
+#endif	// HAND_OPTIMIZED_FLS
+	return index;
+}
+
+// node_child_hash
+static inline
+uint32
+node_child_hash(uint64 id, const char *name)
+{
+	return uint32(id & 0xffffffff) ^ string_hash(name);
+}
+
+#endif	// MISC_H

src/add-ons/kernel/file_systems/ramfs/NameIndex.cpp

@@ -0,0 +1,348 @@
+// NameIndex.cpp
+
+#include <TypeConstants.h>
+
+#include "Debug.h"
+#include "Entry.h"
+#include "IndexImpl.h"
+#include "NameIndex.h"
+#include "ramfs.h"
+#include "Volume.h"
+
+// NameIndexPrimaryKey
+class NameIndexPrimaryKey {
+public:
+	NameIndexPrimaryKey(const Entry *entry,
+						const char *name = NULL)
+		: entry(entry), name(name ? name : entry->GetName()) {}
+	NameIndexPrimaryKey(const char *name)
+		: entry(NULL), name(name) {}
+
+	const Entry	*entry;
+	const char	*name;
+};
+
+// NameIndexGetPrimaryKey
+class NameIndexGetPrimaryKey {
+public:
+	inline NameIndexPrimaryKey operator()(const Entry *a)
+	{
+		return NameIndexPrimaryKey(a);
+	}
+
+	inline NameIndexPrimaryKey operator()(const Entry *a) const
+	{
+		return NameIndexPrimaryKey(a);
+	}
+};
+
+
+// NameIndexPrimaryKeyCompare
+class NameIndexPrimaryKeyCompare
+{
+public:
+	inline int operator()(const NameIndexPrimaryKey &a,
+						  const NameIndexPrimaryKey &b) const
+	{
+		if (a.entry != NULL && a.entry == b.entry)
+			return 0;
+		return strcmp(a.name, b.name);
+	}
+};
+
+
+// EntryTree
+
+typedef TwoKeyAVLTree<Entry*, NameIndexPrimaryKey, NameIndexPrimaryKeyCompare,
+					  NameIndexGetPrimaryKey>
+		_EntryTree;
+
+class NameIndex::EntryTree : public _EntryTree {};
+
+
+// NameIndexEntryIterator
+class NameIndexEntryIterator : public AbstractIndexEntryIterator,
+	public EntryListener {
+public:
+	NameIndexEntryIterator();
+	virtual ~NameIndexEntryIterator();
+
+	virtual Entry *GetCurrent();
+	virtual Entry *GetCurrent(uint8 *buffer, size_t *keyLength);
+	virtual Entry *GetPrevious();
+	virtual Entry *GetNext();
+
+	virtual status_t Suspend();
+	virtual status_t Resume();
+
+	bool SetTo(NameIndex *index, const char *name, bool ignoreValue = false);
+
+	virtual void EntryRemoved(Entry *entry);
+
+private:
+	friend class NameIndex;
+
+	typedef AbstractIndexEntryIterator BaseClass;
+
+private:
+	NameIndex						*fIndex;
+	NameIndex::EntryTree::Iterator	fIterator;
+	bool							fSuspended;
+	bool							fIsNext;
+};
+
+
+// NameIndex
+
+// constructor
+NameIndex::NameIndex(Volume *volume)
+	: Index(volume, "name", B_STRING_TYPE, false),
+	  fEntries(new(nothrow) EntryTree)
+{
+	if (fInitStatus == B_OK && !fEntries)
+		fInitStatus = B_NO_MEMORY;
+	if (fInitStatus == B_OK) {
+		fInitStatus = fVolume->AddEntryListener(this,
+			NULL, ENTRY_LISTEN_ANY_ENTRY | ENTRY_LISTEN_ALL);
+	}
+}
+
+// destructor
+NameIndex::~NameIndex()
+{
+	if (fVolume)
+		fVolume->RemoveEntryListener(this, NULL);
+	if (fEntries)
+		delete fEntries;
+	// Actually we would need to maintain a list of iterators and unset the
+	// still existing iterators here. But since the name index is deleted
+	// when the volume is unmounted, there shouldn't be any iterators left
+	// anymore.
+}
+
+// CountEntries
+int32
+NameIndex::CountEntries() const
+{
+	return fEntries->CountItems();
+}
+
+// Changed
+status_t
+NameIndex::Changed(Entry *entry, const char *oldName)
+{
+	status_t error = B_BAD_VALUE;
+	if (entry && oldName) {
+		EntryTree::Iterator it;
+		Entry **foundEntry
+			= fEntries->Find(NameIndexPrimaryKey(entry, oldName), entry, &it);
+		if (foundEntry && *foundEntry == entry) {
+			fEntries->Remove(it);
+			error = fEntries->Insert(entry);
+
+			// udpate live queries
+			_UpdateLiveQueries(entry, oldName, entry->GetName());
+		}
+	}
+	return error;
+}
+
+// EntryAdded
+void
+NameIndex::EntryAdded(Entry *entry)
+{
+	if (entry) {
+		fEntries->Insert(entry);
+
+		// udpate live queries
+		_UpdateLiveQueries(entry, NULL, entry->GetName());
+	}
+}
+
+// EntryRemoved
+void
+NameIndex::EntryRemoved(Entry *entry)
+{
+	if (entry) {
+		fEntries->Remove(entry, entry);
+
+		// udpate live queries
+		_UpdateLiveQueries(entry, entry->GetName(), NULL);
+	}
+}
+
+// InternalGetIterator
+AbstractIndexEntryIterator *
+NameIndex::InternalGetIterator()
+{
+	NameIndexEntryIterator *iterator = new(nothrow) NameIndexEntryIterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, NULL, true)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// InternalFind
+AbstractIndexEntryIterator *
+NameIndex::InternalFind(const uint8 *key, size_t length)
+{
+	if (!key || length == 0)
+		return NULL;
+
+	// if the key is not null-terminated, copy it
+	uint8 clonedKey[kMaxIndexKeyLength];
+	if (key[length - 1] != '\0') {
+		if (length >= kMaxIndexKeyLength)
+			length = kMaxIndexKeyLength - 1;
+
+		memcpy(clonedKey, key, length);
+		clonedKey[length] = '\0';
+		length++;
+		key = clonedKey;
+	}
+
+	NameIndexEntryIterator *iterator = new(nothrow) NameIndexEntryIterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, (const char *)key)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// _UpdateLiveQueries
+void
+NameIndex::_UpdateLiveQueries(Entry* entry, const char* oldName,
+	const char* newName)
+{
+	fVolume->UpdateLiveQueries(entry, entry->GetNode(), GetName(),
+		GetType(), (const uint8*)oldName, (oldName ? strlen(oldName) : 0),
+		(const uint8*)newName, (newName ? strlen(newName) : 0));
+}
+
+
+// NameIndexEntryIterator
+
+// constructor
+NameIndexEntryIterator::NameIndexEntryIterator()
+	: AbstractIndexEntryIterator(),
+	  fIndex(NULL),
+	  fIterator(),
+	  fSuspended(false),
+	  fIsNext(false)
+{
+}
+
+// destructor
+NameIndexEntryIterator::~NameIndexEntryIterator()
+{
+	SetTo(NULL, NULL);
+}
+
+// GetCurrent
+Entry *
+NameIndexEntryIterator::GetCurrent()
+{
+	return (fIndex && fIterator.GetCurrent() ? *fIterator.GetCurrent() : NULL);
+}
+
+// GetCurrent
+Entry *
+NameIndexEntryIterator::GetCurrent(uint8 *buffer, size_t *keyLength)
+{
+	Entry *entry = GetCurrent();
+	if (entry) {
+		strncpy((char*)buffer, entry->GetName(), kMaxIndexKeyLength);
+		*keyLength = strlen(entry->GetName());
+	}
+	return entry;
+}
+
+// GetPrevious
+Entry *
+NameIndexEntryIterator::GetPrevious()
+{
+	if (fSuspended)
+		return NULL;
+	if (!(fIterator.GetCurrent() && fIsNext))
+		fIterator.GetPrevious();
+	fIsNext = false;
+	return (fIndex && fIterator.GetCurrent() ? *fIterator.GetCurrent() : NULL);
+}
+
+// GetNext
+Entry *
+NameIndexEntryIterator::GetNext()
+{
+	if (fSuspended)
+		return NULL;
+	if (!(fIterator.GetCurrent() && fIsNext))
+		fIterator.GetNext();
+	fIsNext = false;
+	return (fIndex && fIterator.GetCurrent() ? *fIterator.GetCurrent() : NULL);
+}
+
+// Suspend
+status_t
+NameIndexEntryIterator::Suspend()
+{
+	status_t error = (!fSuspended ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (fIterator.GetCurrent()) {
+			error = fIndex->GetVolume()->AddEntryListener(this,
+				*fIterator.GetCurrent(), ENTRY_LISTEN_REMOVED);
+		}
+		if (error == B_OK)
+			fSuspended = true;
+	}
+	return error;
+}
+
+// Resume
+status_t
+NameIndexEntryIterator::Resume()
+{
+	status_t error = (fSuspended ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (fIterator.GetCurrent()) {
+			error = fIndex->GetVolume()->RemoveEntryListener(this,
+				*fIterator.GetCurrent());
+		}
+		if (error == B_OK)
+			fSuspended = false;
+	}
+	return error;
+}
+
+// SetTo
+bool
+NameIndexEntryIterator::SetTo(NameIndex *index, const char *name,
+							  bool ignoreValue)
+{
+	Resume();
+	fIndex = index;
+	fSuspended = false;
+	fIsNext = false;
+	if (fIndex) {
+		if (ignoreValue) {
+			fIndex->fEntries->GetIterator(&fIterator);
+			return fIterator.GetCurrent();
+		}
+		return fIndex->fEntries->FindFirst(name, &fIterator);
+	}
+	return false;
+}
+
+// EntryRemoved
+void
+NameIndexEntryIterator::EntryRemoved(Entry */*entry*/)
+{
+	Resume();
+	fIsNext = GetNext();
+	Suspend();
+}
+

src/add-ons/kernel/file_systems/ramfs/NameIndex.h

@@ -0,0 +1,42 @@
+// NameIndex.h
+
+#ifndef NAME_INDEX_H
+#define NAME_INDEX_H
+
+#include "EntryListener.h"
+#include "Index.h"
+#include "TwoKeyAVLTree.h"
+
+class NameIndexEntryIterator;
+
+// NameIndex
+class NameIndex : public Index, private EntryListener {
+public:
+	NameIndex(Volume *volume);
+	virtual ~NameIndex();
+
+	virtual int32 CountEntries() const;
+
+	virtual status_t Changed(Entry *entry, const char *oldName);
+
+private:
+	virtual void EntryAdded(Entry *entry);
+	virtual void EntryRemoved(Entry *entry);
+
+protected:
+	virtual AbstractIndexEntryIterator *InternalGetIterator();
+	virtual AbstractIndexEntryIterator *InternalFind(const uint8 *key,
+													 size_t length);
+
+private:
+	class EntryTree;
+	friend class NameIndexEntryIterator;
+
+	void _UpdateLiveQueries(Entry* entry, const char* oldName,
+		const char* newName);
+
+private:
+	EntryTree	*fEntries;
+};
+
+#endif	// NAME_INDEX_H

src/add-ons/kernel/file_systems/ramfs/Node.cpp

@@ -0,0 +1,361 @@
+// Node.cpp
+
+#include "AllocationInfo.h"
+#include "Debug.h"
+#include "EntryIterator.h"
+#include "LastModifiedIndex.h"
+#include "Node.h"
+#include "Volume.h"
+
+// is_user_in_group
+inline static
+bool
+is_user_in_group(gid_t gid)
+{
+// Either I miss something, or we don't have getgroups() in the kernel. :-(
+/*
+	gid_t groups[NGROUPS_MAX];
+	int groupCount = getgroups(NGROUPS_MAX, groups);
+	for (int i = 0; i < groupCount; i++) {
+		if (gid == groups[i])
+			return true;
+	}
+*/
+	return (gid == getegid());
+}
+
+
+// constructor
+Node::Node(Volume *volume, uint8 type)
+	: fVolume(volume),
+	  fID(fVolume->NextNodeID()),
+	  fRefCount(0),
+	  fMode(0),
+	  fUID(0),
+	  fGID(0),
+	  fATime(0),
+	  fMTime(0),
+	  fCTime(0),
+	  fCrTime(0),
+	  fModified(false),
+	  fIsKnownToVFS(false),
+	  // attribute management
+	  fAttributes(),
+	  // referrers
+	  fReferrers()
+{
+	// set file type
+	switch (type) {
+		case NODE_TYPE_DIRECTORY:
+			fMode = S_IFDIR;
+			break;
+		case NODE_TYPE_FILE:
+			fMode = S_IFREG;
+			break;
+		case NODE_TYPE_SYMLINK:
+			fMode = S_IFLNK;
+			break;
+	}
+	// set defaults for time
+	fATime = fMTime = fCTime = fCrTime = time(NULL);
+}
+
+// destructor
+Node::~Node()
+{
+	// delete all attributes
+	while (Attribute *attribute = fAttributes.GetFirst()) {
+		status_t error = DeleteAttribute(attribute);
+		if (error != B_OK) {
+			FATAL(("Node::~Node(): Failed to delete attribute!\n"));
+			break;
+		}
+	}
+}
+
+// InitCheck
+status_t
+Node::InitCheck() const
+{
+	return (fVolume && fID >= 0 ? B_OK : B_NO_INIT);
+}
+
+// AddReference
+status_t
+Node::AddReference()
+{
+	if (++fRefCount == 1) {
+		status_t error = GetVolume()->NewVNode(this);
+		if (error != B_OK) {
+			fRefCount--;
+			return error;
+		}
+
+		fIsKnownToVFS = true;
+	}
+
+	return B_OK;
+}
+	
+// RemoveReference
+void
+Node::RemoveReference()
+{
+	if (--fRefCount == 0) {
+		GetVolume()->RemoveVNode(this);
+		fRefCount++;
+	}
+}
+
+// Link
+status_t
+Node::Link(Entry *entry)
+{
+PRINT(("Node[%Ld]::Link(): %ld ->...\n", fID, fRefCount));
+	fReferrers.Insert(entry);
+
+	status_t error = AddReference();
+	if (error != B_OK)
+		fReferrers.Remove(entry);
+
+	return error;
+}
+
+// Unlink
+status_t
+Node::Unlink(Entry *entry)
+{
+PRINT(("Node[%Ld]::Unlink(): %ld ->...\n", fID, fRefCount));
+	RemoveReference();
+	fReferrers.Remove(entry);
+
+	return B_OK;
+}
+
+// SetMTime
+void
+Node::SetMTime(time_t mTime)
+{
+	time_t oldMTime = fMTime;
+	fATime = fMTime = mTime;
+	if (oldMTime != fMTime) {
+		if (LastModifiedIndex *index = fVolume->GetLastModifiedIndex())
+			index->Changed(this, oldMTime);
+	}
+}
+
+// CheckPermissions
+status_t
+Node::CheckPermissions(int mode) const
+{
+	int userPermissions = (fMode & S_IRWXU) >> 6;
+	int groupPermissions = (fMode & S_IRWXG) >> 3;
+	int otherPermissions = fMode & S_IRWXO;
+	// get the permissions for this uid/gid
+	int permissions = 0;
+	uid_t uid = geteuid();
+	// user is root
+	if (uid == 0) {
+		// root has always read/write permission, but at least one of the
+		// X bits must be set for execute permission
+		permissions = userPermissions | groupPermissions | otherPermissions
+			| ACCESS_R | ACCESS_W;
+	// user is node owner
+	} else if (uid == fUID)
+		permissions = userPermissions;
+	// user is in owning group
+	else if (is_user_in_group(fGID))
+		permissions = groupPermissions;
+	// user is one of the others
+	else
+		permissions = otherPermissions;
+	// do the check
+	return ((mode & ~permissions) ? B_NOT_ALLOWED : B_OK);
+}
+
+// CreateAttribute
+status_t
+Node::CreateAttribute(const char *name, Attribute **_attribute)
+{
+	status_t error = (name && _attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// create attribute
+		Attribute *attribute = new(nothrow) Attribute(fVolume, NULL, name);
+		if (attribute) {
+			error = attribute->InitCheck();
+			if (error == B_OK) {
+				// add attribute to node
+				error = AddAttribute(attribute);
+				if (error == B_OK)
+					*_attribute = attribute;
+			}
+			if (error != B_OK)
+				delete attribute;
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// DeleteAttribute
+status_t
+Node::DeleteAttribute(Attribute *attribute)
+{
+	status_t error = RemoveAttribute(attribute);
+	if (error == B_OK)
+		delete attribute;
+	return error;
+}
+
+// AddAttribute
+status_t
+Node::AddAttribute(Attribute *attribute)
+{
+	status_t error = (attribute && !attribute->GetNode() ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = GetVolume()->NodeAttributeAdded(GetID(), attribute);
+		if (error == B_OK) {
+			fAttributes.Insert(attribute);
+			attribute->SetNode(this);
+			MarkModified();
+		}
+	}
+	return error;
+}
+
+// RemoveAttribute
+status_t
+Node::RemoveAttribute(Attribute *attribute)
+{
+	status_t error = (attribute && attribute->GetNode() == this
+					  ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		// move all iterators pointing to the attribute to the next attribute
+		if (GetVolume()->IteratorLock()) {
+			// set the iterators' current entry
+			Attribute *nextAttr = fAttributes.GetNext(attribute);
+			DLList<AttributeIterator> *iterators
+				= attribute->GetAttributeIteratorList();
+			for (AttributeIterator *iterator = iterators->GetFirst();
+				 iterator;
+				 iterator = iterators->GetNext(iterator)) {
+				iterator->SetCurrent(nextAttr, true);
+			}
+			// Move the iterators from one list to the other, or just remove
+			// them, if there is no next attribute.
+			if (nextAttr) {
+				DLList<AttributeIterator> *nextIterators
+					= nextAttr->GetAttributeIteratorList();
+				nextIterators->MoveFrom(iterators);
+			} else
+				iterators->RemoveAll();
+			GetVolume()->IteratorUnlock();
+		} else
+			error = B_ERROR;
+		// remove the attribute
+		if (error == B_OK) {
+			error = GetVolume()->NodeAttributeRemoved(GetID(), attribute);
+			if (error == B_OK) {
+				fAttributes.Remove(attribute);
+				attribute->SetNode(NULL);
+				MarkModified();
+			}
+		}
+	}
+	return error;
+}
+
+// FindAttribute
+status_t
+Node::FindAttribute(const char *name, Attribute **_attribute) const
+{
+	status_t error = (name && _attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+/*
+		Attribute *attribute = NULL;
+		while (GetNextAttribute(&attribute) == B_OK) {
+			if (!strcmp(attribute->GetName(), name)) {
+				*_attribute = attribute;
+				return B_OK;
+			}
+		}
+		error = B_ENTRY_NOT_FOUND;
+*/
+		error = GetVolume()->FindNodeAttribute(GetID(), name, _attribute);
+	}
+	return error;
+}
+
+// GetPreviousAttribute
+status_t
+Node::GetPreviousAttribute(Attribute **attribute) const
+{
+	status_t error = (attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (!*attribute)
+			*attribute = fAttributes.GetLast();
+		else if ((*attribute)->GetNode() == this)
+			*attribute = fAttributes.GetPrevious(*attribute);
+		else
+			error = B_BAD_VALUE;
+		if (error == B_OK && !*attribute)
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// GetNextAttribute
+status_t
+Node::GetNextAttribute(Attribute **attribute) const
+{
+	status_t error = (attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (!*attribute)
+			*attribute = fAttributes.GetFirst();
+		else if ((*attribute)->GetNode() == this)
+			*attribute = fAttributes.GetNext(*attribute);
+		else
+			error = B_BAD_VALUE;
+		if (error == B_OK && !*attribute)
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// GetFirstReferrer
+Entry *
+Node::GetFirstReferrer() const
+{
+	return fReferrers.GetHead();
+}
+
+// GetLastReferrer
+Entry *
+Node::GetLastReferrer() const
+{
+	return fReferrers.GetTail();
+}
+
+// GetPreviousReferrer
+Entry *
+Node::GetPreviousReferrer(Entry *entry) const
+{
+	return (entry ? fReferrers.GetPrevious(entry) : NULL );
+}
+
+// GetNextReferrer
+Entry *
+Node::GetNextReferrer(Entry *entry) const
+{
+	return (entry ? fReferrers.GetNext(entry) : NULL );
+}
+
+// GetAllocationInfo
+void
+Node::GetAllocationInfo(AllocationInfo &info)
+{
+	Attribute *attribute = NULL;
+	while (GetNextAttribute(&attribute) == B_OK)
+		attribute->GetAllocationInfo(info);
+}
+

src/add-ons/kernel/file_systems/ramfs/Node.h

@@ -0,0 +1,175 @@
+// Node.h
+
+#ifndef NODE_H
+#define NODE_H
+
+#include <SupportDefs.h>
+
+#include "Attribute.h"
+#include "Entry.h"
+#include "fsproto.h"
+#include "String.h"
+
+class AllocationInfo;
+class AttributeIterator;
+class Directory;
+class Volume;
+
+// node type
+enum {
+	NODE_TYPE_DIRECTORY,
+	NODE_TYPE_FILE,
+	NODE_TYPE_SYMLINK,
+};
+
+// access modes
+enum {
+	ACCESS_R	= S_IROTH,
+	ACCESS_W	= S_IWOTH,
+	ACCESS_X	= S_IXOTH,
+};
+
+class Node : public DLListLinkImpl<Node> {
+public:
+	Node(Volume *volume, uint8 type);
+	virtual ~Node();
+
+	virtual status_t InitCheck() const;
+
+	inline void SetVolume(Volume *volume)	{ fVolume = volume; }
+	inline Volume *GetVolume() const		{ return fVolume; }
+
+	inline vnode_id GetID() const	{ return fID; }
+
+	status_t AddReference();
+	void RemoveReference();
+	int32 GetRefCount()	{ return fRefCount; }
+
+	virtual status_t Link(Entry *entry);
+	virtual status_t Unlink(Entry *entry);
+
+	inline bool IsDirectory() const	{ return S_ISDIR(fMode); }
+	inline bool IsFile() const		{ return S_ISREG(fMode); }
+	inline bool IsSymLink() const	{ return S_ISLNK(fMode); }
+
+	virtual status_t SetSize(off_t newSize) = 0;
+	virtual off_t GetSize() const = 0;
+
+	// stat data
+
+	inline void SetMode(mode_t mode)
+		{ fMode = fMode & ~S_IUMSK | mode & S_IUMSK; }
+	inline mode_t GetMode() const	{ return fMode; }
+
+	inline void SetUID(uid_t uid)	{ fUID = uid; }
+	inline uid_t GetUID() const		{ return fUID; }
+
+	inline void SetGID(uid_t gid)	{ fGID = gid; }
+	inline uid_t GetGID() const		{ return fGID; }
+
+	inline void SetATime(time_t aTime)	{ fATime = aTime; }
+	inline time_t GetATime() const		{ return fATime; }
+
+	void SetMTime(time_t mTime);
+	inline time_t GetMTime() const		{ return fMTime; }
+
+	inline void SetCTime(time_t cTime)	{ fCTime = cTime; }
+	inline time_t GetCTime() const		{ return fCTime; }
+
+	inline void SetCrTime(time_t crTime)	{ fCrTime = crTime; }
+	inline time_t GetCrTime() const			{ return fCrTime; }
+
+	inline void MarkModified()				{ fModified = true; }
+	inline void MarkUnmodified();
+	inline void SetModified(bool modified)	{ fModified = modified; }
+	inline bool IsModified() const			{ return fModified; }
+
+	status_t CheckPermissions(int mode) const;
+
+	bool IsKnownToVFS() const	{ return fIsKnownToVFS; }
+
+	// attributes
+	status_t CreateAttribute(const char *name, Attribute **attribute);
+	status_t DeleteAttribute(Attribute *attribute);
+	status_t AddAttribute(Attribute *attribute);
+	status_t RemoveAttribute(Attribute *attribute);
+
+	status_t FindAttribute(const char *name, Attribute **attribute) const;
+
+	status_t GetPreviousAttribute(Attribute **attribute) const;
+	status_t GetNextAttribute(Attribute **attribute) const;
+
+	Entry *GetFirstReferrer() const;
+	Entry *GetLastReferrer() const;
+	Entry *GetPreviousReferrer(Entry *entry) const;
+	Entry *GetNextReferrer(Entry *entry) const;
+
+	// debugging
+	virtual void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	Volume					*fVolume;
+	vnode_id				fID;
+	int32					fRefCount;
+	mode_t					fMode;
+	uid_t					fUID;
+	uid_t					fGID;
+	time_t					fATime;
+	time_t					fMTime;
+	time_t					fCTime;
+	time_t					fCrTime;
+	bool					fModified;
+	bool					fIsKnownToVFS;
+
+	// attribute management
+	DLList<Attribute>		fAttributes;
+
+protected:
+	// entries referring to this node
+	DLList<Entry, GetNodeReferrerLink>	fReferrers;
+};
+
+// MarkUnmodified
+inline
+void
+Node::MarkUnmodified()
+{
+	if (fModified) {
+		fCTime = time(NULL);
+		SetMTime(fCTime);
+		fModified = false;
+	}
+}
+
+// open_mode_to_access
+inline static
+int
+open_mode_to_access(int openMode)
+{
+	switch (openMode & O_RWMASK) {
+		case O_RDONLY:
+			return ACCESS_R;
+		case O_WRONLY:
+			return ACCESS_W;
+		case O_RDWR:
+			return ACCESS_R | ACCESS_W;
+	}
+	return 0;
+}
+
+
+// NodeMTimeUpdater
+class NodeMTimeUpdater {
+public:
+	NodeMTimeUpdater(Node *node) : fNode(node) {}
+	~NodeMTimeUpdater()
+	{
+		if (fNode && fNode->IsModified())
+			fNode->MarkUnmodified();
+	}
+
+private:
+	Node	*fNode;
+};
+
+#endif	// NODE_H

src/add-ons/kernel/file_systems/ramfs/NodeChildTable.h

@@ -0,0 +1,245 @@
+// NodeChildTable.h
+
+#ifndef NODE_CHILD_TABLE_H
+#define NODE_CHILD_TABLE_H
+
+#include "AllocationInfo.h"
+#include "Debug.h"
+#include "Misc.h"
+#include "Node.h"
+#include "OpenHashTable.h"
+
+// NodeChildHashElement
+template<typename ParentNode, typename NodeChild>
+class NodeChildHashElement : public OpenHashElement {
+private:
+	typedef NodeChildHashElement<ParentNode, NodeChild> Element;
+public:
+
+	NodeChildHashElement() : OpenHashElement(), fID(-1), fChild(NULL)
+	{
+		fNext = -1;
+	}
+
+	static inline uint32 HashFor(vnode_id id, const char *name)
+	{
+		return node_child_hash(id, name);
+	}
+
+	static inline uint32 HashFor(ParentNode *parent, NodeChild *child)
+	{
+		return node_child_hash(parent->GetID(), child->GetName());
+	}
+
+	inline uint32 Hash() const
+	{
+		return HashFor(fID, fChild->GetName());
+	}
+
+	inline bool Equals(vnode_id id, const char *name)
+	{
+		return (fID == id && !strcmp(fChild->GetName(), name));
+	}
+
+	inline bool operator==(const OpenHashElement &_element) const
+	{
+		const Element &element = static_cast<const Element&>(_element);
+		return Equals(element.fID, element.fChild->GetName());
+	}
+
+	inline void Adopt(Element &element)
+	{
+		fID = element.fID;
+		fChild = element.fChild;
+	}
+
+	vnode_id	fID;
+	NodeChild	*fChild;
+};
+
+// NodeChildTable
+template<typename ParentNode, typename NodeChild>
+class NodeChildTable {
+public:
+	NodeChildTable();
+	~NodeChildTable();
+
+	status_t InitCheck() const;
+
+	status_t AddNodeChild(ParentNode *node, NodeChild *child);
+	status_t AddNodeChild(vnode_id, NodeChild *child);
+	status_t RemoveNodeChild(ParentNode *node, NodeChild *child);
+	status_t RemoveNodeChild(vnode_id id, NodeChild *child);
+	status_t RemoveNodeChild(vnode_id id, const char *name);
+	NodeChild *GetNodeChild(vnode_id id, const char *name);
+
+protected:
+	typedef NodeChildHashElement<ParentNode, NodeChild>	Element;
+
+private:
+	Element *_FindElement(vnode_id id, const char *name) const;
+
+protected:
+	OpenHashElementArray<Element>							fElementArray;
+	OpenHashTable<Element, OpenHashElementArray<Element> >	fTable;
+};
+
+// define convenient instantiation types
+
+// DirectoryEntryTable
+class DirectoryEntryTable : public NodeChildTable<Directory, Entry> {
+public:
+	DirectoryEntryTable()	{}
+	~DirectoryEntryTable()	{}
+
+	void GetAllocationInfo(AllocationInfo &info)
+	{
+		info.AddDirectoryEntryTableAllocation(fTable.ArraySize(),
+											  fTable.VectorSize(),
+											  sizeof(Element),
+											  fTable.CountElements());
+	}
+};
+
+// NodeAttributeTable
+class NodeAttributeTable : public NodeChildTable<Node, Attribute> {
+public:
+	NodeAttributeTable()	{}
+	~NodeAttributeTable()	{}
+
+	void GetAllocationInfo(AllocationInfo &info)
+	{
+		info.AddNodeAttributeTableAllocation(fTable.ArraySize(),
+											 fTable.VectorSize(),
+											 sizeof(Element),
+											 fTable.CountElements());
+	}
+};
+
+
+// NodeChildTable implementation
+
+// constructor
+template<typename ParentNode, typename NodeChild>
+NodeChildTable<ParentNode, NodeChild>::NodeChildTable()
+	: fElementArray(1000),
+	  fTable(1000, &fElementArray)
+{
+}
+
+// destructor
+template<typename ParentNode, typename NodeChild>
+NodeChildTable<ParentNode, NodeChild>::~NodeChildTable()
+{
+}
+
+// InitCheck
+template<typename ParentNode, typename NodeChild>
+status_t
+NodeChildTable<ParentNode, NodeChild>::InitCheck() const
+{
+	RETURN_ERROR(fTable.InitCheck() && fElementArray.InitCheck()
+				 ? B_OK : B_NO_MEMORY);
+}
+
+// AddNodeChild
+template<typename ParentNode, typename NodeChild>
+status_t
+NodeChildTable<ParentNode, NodeChild>::AddNodeChild(ParentNode *node,
+													NodeChild *child)
+{
+	status_t error = (node && child ? B_OK : B_BAD_VALUE);
+	if (error == B_OK)
+		error = AddNodeChild(node->GetID(), child);
+	return error;
+}
+
+// AddNodeChild
+template<typename ParentNode, typename NodeChild>
+status_t
+NodeChildTable<ParentNode, NodeChild>::AddNodeChild(vnode_id id,
+													NodeChild *child)
+{
+	status_t error = (child ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		Element *element = fTable.Add(Element::HashFor(id, child->GetName()));
+		if (element) {
+			element->fID = id;
+			element->fChild = child;
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// RemoveNodeChild
+template<typename ParentNode, typename NodeChild>
+status_t
+NodeChildTable<ParentNode, NodeChild>::RemoveNodeChild(ParentNode *node,
+													   NodeChild *child)
+{
+	status_t error = (node && child ? B_OK : B_BAD_VALUE);
+	if (error == B_OK)
+		error = RemoveNodeChild(node->GetID(), child->GetName());
+	return error;
+}
+
+// RemoveNodeChild
+template<typename ParentNode, typename NodeChild>
+status_t
+NodeChildTable<ParentNode, NodeChild>::RemoveNodeChild(vnode_id id,
+													   NodeChild *child)
+{
+	status_t error = (child ? B_OK : B_BAD_VALUE);
+	if (error == B_OK)
+		error = RemoveNodeChild(id, child->GetName());
+	return error;
+}
+
+// RemoveNodeChild
+template<typename ParentNode, typename NodeChild>
+status_t
+NodeChildTable<ParentNode, NodeChild>::RemoveNodeChild(vnode_id id,
+													   const char *name)
+{
+	status_t error = B_OK;
+	if (Element *element = _FindElement(id, name))
+		fTable.Remove(element);
+	else
+		error = B_ERROR;
+	return error;
+}
+
+// GetNodeChild
+template<typename ParentNode, typename NodeChild>
+NodeChild *
+NodeChildTable<ParentNode, NodeChild>::GetNodeChild(vnode_id id,
+													const char *name)
+{
+	NodeChild *child = NULL;
+	if (Element *element = _FindElement(id, name))
+		child = element->fChild;
+	return child;
+}
+
+// _FindElement
+template<typename ParentNode, typename NodeChild>
+NodeChildTable<ParentNode, NodeChild>::Element *
+NodeChildTable<ParentNode, NodeChild>::_FindElement(vnode_id id,
+													const char *name) const
+{
+	Element *element = fTable.FindFirst(Element::HashFor(id, name));
+	while (element && !element->Equals(id, name)) {
+		if (element->fNext >= 0)
+			element = fTable.ElementAt(element->fNext);
+		else
+			element = NULL;
+	}
+	return element;
+}
+
+
+// undefine the PRINT from <Debug.h>
+//#undef PRINT
+
+#endif	// NODE_CHILD_TABLE_H

src/add-ons/kernel/file_systems/ramfs/NodeListener.cpp

@@ -0,0 +1,26 @@
+// NodeListener.cpp
+
+#include "NodeListener.h"
+
+// constructor
+NodeListener::NodeListener()
+{
+}
+
+// destructor
+NodeListener::~NodeListener()
+{
+}
+
+// NodeAdded
+void
+NodeListener::NodeAdded(Node */*node*/)
+{
+}
+
+// NodeRemoved
+void
+NodeListener::NodeRemoved(Node */*node*/)
+{
+}
+

src/add-ons/kernel/file_systems/ramfs/NodeListener.h

@@ -0,0 +1,25 @@
+// NodeListener.h
+
+#ifndef NODE_LISTENER_H
+#define NODE_LISTENER_H
+
+class Node;
+
+// listening flags
+enum {
+	NODE_LISTEN_ANY_NODE	= 0x01,
+	NODE_LISTEN_ADDED		= 0x02,
+	NODE_LISTEN_REMOVED		= 0x04,
+	NODE_LISTEN_ALL			= NODE_LISTEN_ADDED | NODE_LISTEN_REMOVED,
+};
+
+class NodeListener {
+public:
+	NodeListener();
+	virtual ~NodeListener();
+
+	virtual void NodeAdded(Node *node);
+	virtual void NodeRemoved(Node *node);
+};
+
+#endif	// NODE_LISTENER_H

src/add-ons/kernel/file_systems/ramfs/NodeTable.cpp

@@ -0,0 +1,97 @@
+// NodeTable.cpp
+
+#include "Debug.h"
+#include "NodeTable.h"
+
+// constructor
+NodeTable::NodeTable()
+	: fElementArray(1000),
+	  fNodes(1000, &fElementArray)
+{
+}
+
+// destructor
+NodeTable::~NodeTable()
+{
+}
+
+// InitCheck
+status_t
+NodeTable::InitCheck() const
+{
+	RETURN_ERROR(fNodes.InitCheck() && fElementArray.InitCheck()
+				 ? B_OK : B_NO_MEMORY);
+}
+
+// AddNode
+status_t
+NodeTable::AddNode(Node *node)
+{
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		NodeHashElement *element
+			= fNodes.Add(NodeHashElement::HashForID(node));
+		if (element)
+			element->fNode = node;
+		else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// RemoveNode
+status_t
+NodeTable::RemoveNode(Node *node)
+{
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK)
+		error = RemoveNode(node->GetID());
+	return error;
+}
+
+// RemoveNode
+status_t
+NodeTable::RemoveNode(vnode_id id)
+{
+	status_t error = B_OK;
+	if (NodeHashElement *element = _FindElement(id))
+		fNodes.Remove(element);
+	else
+		error = B_ERROR;
+	return error;
+}
+
+// GetNode
+Node *
+NodeTable::GetNode(vnode_id id)
+{
+	Node *node = NULL;
+	if (NodeHashElement *element = _FindElement(id))
+		node = element->fNode;
+	return node;
+}
+
+// GetAllocationInfo
+void
+NodeTable::GetAllocationInfo(AllocationInfo &info)
+{
+	info.AddNodeTableAllocation(fNodes.ArraySize(), fNodes.VectorSize(),
+								sizeof(NodeHashElement),
+								fNodes.CountElements());
+}
+
+// _FindElement
+NodeHashElement *
+NodeTable::_FindElement(vnode_id id) const
+{
+	NodeHashElement *element
+		= fNodes.FindFirst(NodeHashElement::HashForID(id));
+	while (element && element->fNode->GetID() != id) {
+		if (element->fNext >= 0)
+			element = fNodes.ElementAt(element->fNext);
+		else
+			element = NULL;
+	}
+	return element;
+}
+

src/add-ons/kernel/file_systems/ramfs/NodeTable.h

@@ -0,0 +1,74 @@
+// NodeTable.h
+
+#ifndef NODE_TABLE_H
+#define NODE_TABLE_H
+
+#include "AllocationInfo.h"
+#include "Node.h"
+#include "OpenHashTable.h"
+
+// NodeHashElement
+class NodeHashElement : public OpenHashElement {
+public:
+	NodeHashElement() : OpenHashElement(), fNode(NULL)
+	{
+		fNext = -1;
+	}
+
+	static inline uint32 HashForID(vnode_id id)
+	{
+		return uint32(id & 0xffffffff);
+	}
+
+	static inline uint32 HashForID(Node *node)
+	{
+		return HashForID(node->GetID());
+	}
+
+	inline uint32 Hash() const
+	{
+		return HashForID(fNode);
+	}
+
+	inline bool operator==(const OpenHashElement &element) const
+	{
+		return (static_cast<const NodeHashElement&>(element).fNode == fNode);
+	}
+
+	inline void Adopt(NodeHashElement &element)
+	{
+		fNode = element.fNode;
+	}
+
+	Node	*fNode;
+};
+
+// NodeTable
+class NodeTable {
+public:
+	NodeTable();
+	~NodeTable();
+
+	status_t InitCheck() const;
+
+	status_t AddNode(Node *node);
+	status_t RemoveNode(Node *node);
+	status_t RemoveNode(vnode_id id);
+	Node *GetNode(vnode_id id);
+
+	// debugging
+	void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	NodeHashElement *_FindElement(vnode_id id) const;
+
+private:
+	OpenHashElementArray<NodeHashElement>	fElementArray;
+	OpenHashTable<NodeHashElement, OpenHashElementArray<NodeHashElement> >
+		fNodes;
+};
+
+// undefine the PRINT from <Debug.h>
+//#undef PRINT
+
+#endif	// NODE_TABLE_H

src/add-ons/kernel/file_systems/ramfs/OpenHashTable.h

@@ -0,0 +1,496 @@
+/*
+Open Tracker License
+
+Terms and Conditions
+
+Copyright (c) 1991-2000, Be Incorporated. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice applies to all licensees
+and shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF TITLE, MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+BE INCORPORATED BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of Be Incorporated shall not be
+used in advertising or otherwise to promote the sale, use or other dealings in
+this Software without prior written authorization from Be Incorporated.
+
+Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
+of Be Incorporated in the United States and other countries. Other brand product
+names are registered trademarks or trademarks of their respective holders.
+All rights reserved.
+*/
+
+// bonefish:
+// * removed need for exceptions
+// * fixed warnings
+// * implemented rehashing
+// * hash array and element vector use areas for allocations
+// TODO:
+// * shrinking of element vectors
+
+// Hash table with open addresssing
+
+#ifndef __OPEN_HASH_TABLE__
+#define __OPEN_HASH_TABLE__
+
+#include <malloc.h>
+#include <new.h>
+
+#include "AreaUtils.h"
+#include "Misc.h"
+
+// don't include <Debug.h>
+#define ASSERT(E)               (void)0
+#define TRESPASS()              (void)0
+ 
+//namespace BPrivate {
+
+template <class Element>
+class ElementVector {
+	// element vector for OpenHashTable needs to implement this
+	// interface
+public:
+	Element &At(int32 index);
+	Element *Add();
+	int32 IndexOf(const Element &) const;
+	void Remove(int32 index);
+};
+
+class OpenHashElement {
+public:
+	uint32 Hash() const;
+	bool operator==(const OpenHashElement &) const;
+	void Adopt(OpenHashElement &);
+		// low overhead copy, original element is in undefined state
+		// after call (calls Adopt on BString members, etc.)
+	int32 fNext;
+};
+
+const uint32 kPrimes [] = {
+	509, 1021, 2039, 4093, 8191, 16381, 32749, 65521, 131071, 262139,
+	524287, 1048573, 2097143, 4194301, 8388593, 16777213, 33554393, 67108859,
+	134217689, 268435399, 536870909, 1073741789, 2147483647, 0
+};
+
+template <class Element, class ElementVec = ElementVector<Element> >
+class OpenHashTable {
+public:
+	OpenHashTable(int32 minSize, ElementVec *elementVector = 0,
+				  float maxLoadFactor = 0.8);
+		// it is up to the subclass of OpenHashTable to supply
+		// elementVector
+	~OpenHashTable();
+	
+	bool InitCheck() const;
+
+	void SetElementVector(ElementVec *elementVector);
+	
+	Element *FindFirst(uint32 elementHash) const;
+	Element *Add(uint32 elementHash);
+	
+	void Remove(Element *);
+	
+	// when calling Add, any outstanding element pointer may become
+	// invalid; to deal with this, get the element index and restore
+	// it after the add
+	int32 ElementIndex(const Element *) const;
+	Element *ElementAt(int32 index) const;
+
+	int32 ArraySize() const;
+	int32 VectorSize() const;
+	int32 CountElements() const;
+
+protected:
+	static int32 OptimalSize(int32 minSize);
+
+private:
+	bool _RehashIfNeeded();
+	bool _Rehash();
+	
+	int32 fArraySize;
+	int32 fInitialSize;
+	int32 fElementCount;
+	int32 *fHashArray;
+	ElementVec *fElementVector;
+	float fMaxLoadFactor;
+};
+
+template <class Element>
+class OpenHashElementArray : public ElementVector<Element> {
+	// this is a straightforward implementation of an element vector
+	// deleting is handled by linking deleted elements into a free list
+	// the vector never shrinks
+public:
+	OpenHashElementArray(int32 initialSize);
+	~OpenHashElementArray();
+
+	bool InitCheck() const;
+
+	Element &At(int32 index);
+	const Element &At(int32 index) const;
+	Element *Add(const Element &);
+	Element *Add();
+	void Remove(int32 index);
+	int32 IndexOf(const Element &) const;
+	int32 Size() const;
+
+private:
+	Element *fData;
+	int32 fSize;
+	int32 fNextFree;
+	int32 fNextDeleted;
+};
+
+
+//-----------------------------------
+
+template<class Element, class ElementVec>
+OpenHashTable<Element, ElementVec>::OpenHashTable(int32 minSize,
+	ElementVec *elementVector, float maxLoadFactor)
+	:	fArraySize(OptimalSize(minSize)),
+		fInitialSize(fArraySize),
+		fElementCount(0),
+		fElementVector(elementVector),
+		fMaxLoadFactor(maxLoadFactor)
+{
+	// sanity check the maximal load factor
+	if (fMaxLoadFactor < 0.5)
+		fMaxLoadFactor = 0.5;
+	// allocate and init the array
+	fHashArray = (int32*)AreaUtils::calloc(fArraySize, sizeof(int32));
+	if (fHashArray) {
+		for (int32 index = 0; index < fArraySize; index++)
+			fHashArray[index] = -1;
+	}
+}
+
+template<class Element, class ElementVec>
+OpenHashTable<Element, ElementVec>::~OpenHashTable()
+{
+	AreaUtils::free(fHashArray);
+}
+
+template<class Element, class ElementVec>
+bool
+OpenHashTable<Element, ElementVec>::InitCheck() const
+{
+	return (fHashArray && fElementVector);
+}
+
+template<class Element, class ElementVec>
+int32 
+OpenHashTable<Element, ElementVec>::OptimalSize(int32 minSize)
+{
+	for (int32 index = 0; ; index++)
+		if (!kPrimes[index] || kPrimes[index] >= (uint32)minSize)
+			return (int32)kPrimes[index];
+
+	return 0;
+}
+
+template<class Element, class ElementVec>
+Element *
+OpenHashTable<Element, ElementVec>::FindFirst(uint32 hash) const
+{
+	ASSERT(fElementVector);
+	hash %= fArraySize;
+	if (fHashArray[hash] < 0)
+		return 0;
+	
+	return &fElementVector->At(fHashArray[hash]);
+}
+
+template<class Element, class ElementVec>
+int32 
+OpenHashTable<Element, ElementVec>::ElementIndex(const Element *element) const
+{
+	return fElementVector->IndexOf(*element);
+}
+
+template<class Element, class ElementVec>
+Element *
+OpenHashTable<Element, ElementVec>::ElementAt(int32 index) const
+{
+	return &fElementVector->At(index);
+}
+
+template<class Element, class ElementVec>
+int32 
+OpenHashTable<Element, ElementVec>::ArraySize() const
+{
+	 return fArraySize;
+}
+
+template<class Element, class ElementVec>
+int32 
+OpenHashTable<Element, ElementVec>::VectorSize() const
+{
+	 return fElementVector->Size();
+}
+
+template<class Element, class ElementVec>
+int32 
+OpenHashTable<Element, ElementVec>::CountElements() const
+{
+	 return fElementCount;
+}
+
+
+template<class Element, class ElementVec>
+Element *
+OpenHashTable<Element, ElementVec>::Add(uint32 hash)
+{
+	ASSERT(fElementVector);
+	_RehashIfNeeded();
+	hash %= fArraySize;
+	Element *result = fElementVector->Add();
+	if (result) {
+		result->fNext = fHashArray[hash];
+		fHashArray[hash] = fElementVector->IndexOf(*result);
+		fElementCount++;
+	}
+	return result;
+}
+
+template<class Element, class ElementVec>
+void 
+OpenHashTable<Element, ElementVec>::Remove(Element *element)
+{
+	_RehashIfNeeded();
+	uint32 hash = element->Hash() % fArraySize;
+	int32 next = fHashArray[hash];
+	ASSERT(next >= 0);
+
+	if (&fElementVector->At(next) == element) {
+		fHashArray[hash] = element->fNext;
+		fElementVector->Remove(next);
+		fElementCount--;
+		return;
+	}
+
+	for (int32 index = next; index >= 0; ) {
+		// look for an existing match in table
+		next = fElementVector->At(index).fNext;
+		if (next < 0) {
+			TRESPASS();
+			return;
+		}
+		
+		if (&fElementVector->At(next) == element) {
+			fElementVector->At(index).fNext = element->fNext;
+			fElementVector->Remove(next);
+			fElementCount--;
+			return;
+		}
+		index = next;
+	}
+}
+
+template<class Element, class ElementVec>
+void 
+OpenHashTable<Element, ElementVec>::SetElementVector(ElementVec *elementVector)
+{
+	fElementVector = elementVector;
+}
+
+// _RehashIfNeeded
+template<class Element, class ElementVec>
+bool
+OpenHashTable<Element, ElementVec>::_RehashIfNeeded()
+{
+	// The load factor range [fMaxLoadFactor / 3, fMaxLoadFactor] is fine,
+	// I think. After rehashing the load factor will be about
+	// fMaxLoadFactor * 2 / 3, respectively fMaxLoadFactor / 2.
+	float loadFactor = (float)fElementCount / (float)fArraySize;
+	if (loadFactor > fMaxLoadFactor
+		|| (fArraySize > fInitialSize && loadFactor < fMaxLoadFactor / 3)) {
+		return _Rehash();
+	}
+	return true;
+}
+
+// _Rehash
+template<class Element, class ElementVec>
+bool
+OpenHashTable<Element, ElementVec>::_Rehash()
+{
+	bool result = true;
+	int32 newSize = max(fInitialSize,
+						int32(fElementCount * 1.73 * fMaxLoadFactor));
+	newSize = OptimalSize(newSize);
+	if (newSize != fArraySize) {
+PRINT(("_Rehash(): %lu -> %lu (currently %lu entries)\n", fArraySize, newSize,
+fElementCount));
+		// allocate a new array
+		int32 *newHashArray
+			= (int32*)AreaUtils::calloc(newSize, sizeof(int32));
+		if (newHashArray) {
+			// init the new hash array
+			for (int32 index = 0; index < newSize; index++)
+				newHashArray[index] = -1;
+			// iterate through all elements and put them into the new
+			// hash array
+			for (int i = 0; i < fArraySize; i++) {
+				int32 index = fHashArray[i];
+				while (index >= 0) {
+					// insert the element in the new array
+					Element &element = fElementVector->At(index);
+					int32 next = element.fNext;
+					uint32 hash = (element.Hash() % newSize);
+					element.fNext = newHashArray[hash];
+					newHashArray[hash] = index;
+					// next element in old list
+					index = next;
+				}
+			}
+			// delete the old array and set the new one
+			AreaUtils::free(fHashArray);
+			fHashArray = newHashArray;
+			fArraySize = newSize;
+		} else
+			result = false;
+	}
+	return result;
+}
+
+
+template<class Element>
+OpenHashElementArray<Element>::OpenHashElementArray(int32 initialSize)
+	:	fSize(initialSize),
+		fNextFree(0),
+		fNextDeleted(-1)
+{
+	fData = (Element*)AreaUtils::calloc((size_t)initialSize, sizeof(Element));
+}
+
+template<class Element>
+OpenHashElementArray<Element>::~OpenHashElementArray()
+{
+	AreaUtils::free(fData);
+}
+
+template<class Element>
+bool
+OpenHashElementArray<Element>::InitCheck() const
+{
+	return fData;
+}
+
+template<class Element>
+Element &
+OpenHashElementArray<Element>::At(int32 index)
+{
+	ASSERT(index < fSize);
+	return fData[index];
+}
+
+template<class Element>
+const Element &
+OpenHashElementArray<Element>::At(int32 index) const
+{
+	ASSERT(index < fSize);
+	return fData[index];
+}
+
+template<class Element>
+int32 
+OpenHashElementArray<Element>::IndexOf(const Element &element) const
+{
+	int32 result = &element - fData;
+	if (result < 0 || result > fSize)
+		return -1;
+	
+	return result;
+}
+
+template<class Element>
+int32 
+OpenHashElementArray<Element>::Size() const
+{
+	return fSize;
+}
+
+
+template<class Element>
+Element *
+OpenHashElementArray<Element>::Add(const Element &newElement)
+{
+	Element *element = Add();
+	if (element)
+		element.Adopt(newElement);
+	return element;
+}
+
+#if DEBUG
+const int32 kGrowChunk = 10;
+#else
+const int32 kGrowChunk = 1024;
+#endif
+
+template<class Element>
+Element *
+OpenHashElementArray<Element>::Add()
+{
+	int32 index = fNextFree;
+	if (fNextDeleted >= 0) {
+		index = fNextDeleted;
+		fNextDeleted = At(index).fNext;		
+	} else if (fNextFree >= fSize - 1) {
+		int32 newSize = fSize + kGrowChunk;
+/*
+		Element *newData = (Element *)calloc((size_t)newSize , sizeof(Element));
+		if (!newData)
+			return NULL;
+		memcpy(newData, fData, fSize * sizeof(Element));
+		free(fData);
+*/
+		Element *newData = (Element*)AreaUtils::realloc(fData,
+			(size_t)newSize * sizeof(Element));
+		if (!newData)
+			return NULL;
+
+		fData = newData;
+		fSize = newSize;
+		index = fNextFree;
+		fNextFree++;
+	} else
+		fNextFree++;
+
+	new (&At(index)) Element;
+		// call placement new to initialize the element properly
+	ASSERT(At(index).fNext == -1);
+
+	return &At(index);		
+}
+
+template<class Element>
+void 
+OpenHashElementArray<Element>::Remove(int32 index)
+{
+	// delete by chaining empty elements in a single linked
+	// list, reusing the next field
+	ASSERT(index < fSize);
+	At(index).~Element();
+		// call the destructor explicitly to destroy the element
+		// properly
+	At(index).fNext = fNextDeleted;
+	fNextDeleted = index;
+}
+
+//} // namespace BPrivate
+
+//using namespace BPrivate;
+
+#endif

src/add-ons/kernel/file_systems/ramfs/Query.h

@@ -0,0 +1,127 @@
+/* Query - query parsing and evaluation
+ *
+ * Copyright 2001-2004, Axel Dörfler, axeld@pinc-software.de.
+ * This file may be used under the terms of the MIT License.
+ *
+ * Adjusted by Ingo Weinhold <bonefish@cs.tu-berlin.de> for usage in RAM FS.
+ */
+#ifndef QUERY_H
+#define QUERY_H
+
+
+#include <OS.h>
+#include <SupportDefs.h>
+
+#include "DLList.h"
+#include "Index.h"
+#include "Stack.h"
+#include "ramfs.h"
+
+class Entry;
+class Equation;
+class IndexIterator;
+class Node;
+class Query;
+class Term;
+class Volume;
+
+
+#define B_QUERY_NON_INDEXED	0x00000002
+
+
+// Wraps the RAM FS Index to provide the interface required by the Query
+// implementation. At least most of it.
+//
+// IndexWrapper
+class IndexWrapper {
+public:
+	IndexWrapper(Volume *volume);
+
+	status_t SetTo(const char *name);
+	void Unset();
+
+	uint32 Type() const;
+	off_t GetSize() const;
+	int32 KeySize() const;
+
+private:
+	friend class IndexIterator;
+
+	Volume	*fVolume;
+	Index	*fIndex;
+};
+
+// IndexIterator
+class IndexIterator {
+public:
+	IndexIterator(IndexWrapper *indexWrapper);
+
+	status_t Find(const uint8 *const key, size_t keyLength);
+	status_t GetNextEntry(uint8 *buffer, uint16 *keyLength, size_t bufferSize,
+						  Entry **entry);
+
+private:
+	IndexWrapper		*fIndexWrapper;
+	IndexEntryIterator	fIterator;
+	bool				fInitialized;
+};
+
+
+class Expression {
+	public:
+		Expression(char *expr);
+		~Expression();
+
+		status_t InitCheck();
+		const char *Position() const { return fPosition; }
+		Term *Root() const { return fTerm; }
+
+	protected:
+		Term *ParseOr(char **expr);
+		Term *ParseAnd(char **expr);
+		Term *ParseEquation(char **expr);
+
+		bool IsOperator(char **expr,char op);
+
+	private:
+		Expression(const Expression &);
+		Expression &operator=(const Expression &);
+			// no implementation
+
+		char *fPosition;
+		Term *fTerm;
+};
+
+class Query : public DLListLinkImpl<Query> {
+	public:
+		Query(Volume *volume, Expression *expression, uint32 flags);
+		~Query();
+
+		status_t Rewind();
+		status_t GetNextEntry(struct dirent *, size_t size);
+
+		void SetLiveMode(port_id port, int32 token);
+		void LiveUpdate(Entry *entry, Node* node, const char *attribute,
+			int32 type, const uint8 *oldKey, size_t oldLength,
+			const uint8 *newKey, size_t newLength);
+
+		Expression *GetExpression() const { return fExpression; }
+
+	private:
+//		void SendNotification(Entry* entry)
+
+	private:
+		Volume			*fVolume;
+		Expression		*fExpression;
+		Equation		*fCurrent;
+		IndexIterator	*fIterator;
+		IndexWrapper	fIndex;
+		Stack<Equation *> fStack;
+
+		uint32			fFlags;
+		port_id			fPort;
+		int32			fToken;
+		bool			fNeedsEntry;
+};
+
+#endif	/* QUERY_H */

src/add-ons/kernel/file_systems/ramfs/SLList.h

@@ -0,0 +1,288 @@
+// SLList.h
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+// 
+// Except as contained in this notice, the name of a copyright holder shall
+// not be used in advertising or otherwise to promote the sale, use or other
+// dealings in this Software without prior written authorization of the
+// copyright holder.
+
+#ifndef SL_LIST_H
+#define SL_LIST_H
+
+#include <new>
+
+// SLListStandardNode
+template<typename Value>
+struct SLListStandardNode {
+	SLListStandardNode(const Value &a)
+		: value(a),
+		  next(NULL)
+	{
+	}
+
+	Value						value;
+	SLListStandardNode<Value>	*next;
+};
+
+// SLListStandardNodeAllocator
+template<typename Value, typename Node>
+class SLListStandardNodeAllocator
+{
+public:
+	inline Node *Allocate(const Value &a) const
+	{
+		return new(nothrow) SLListStandardNode<Value>(a);
+	}
+
+	inline void Free(Node *node) const
+	{
+		delete node;
+	}
+};
+
+// SLListValueNodeAllocator
+template<typename Value, typename Node>
+class SLListValueNodeAllocator
+{
+public:
+	inline Node *Allocate(const Value &a) const
+	{
+		return a;
+	}
+
+	inline void Free(Node *node) const
+	{
+	}
+};
+
+// SLListStandardGetValue
+template<typename Value, typename Node>
+class SLListStandardGetValue
+{
+public:
+	inline Value &operator()(Node *node) const
+	{
+		return node->value;
+	}
+};
+
+// SLListValueNodeGetValue
+template<typename Value, typename Node>
+class SLListValueNodeGetValue
+{
+public:
+	inline Value &operator()(Node *node) const
+	{
+		return *node;
+	}
+};
+
+// for convenience
+#define SL_LIST_TEMPLATE_LIST template<typename Value, typename Node, \
+	typename NodeAllocator, typename GetValue>
+#define SL_LIST_CLASS_NAME SLList<Value, Node, NodeAllocator, GetValue>
+
+// SLList
+template<typename Value, typename Node = SLListStandardNode<Value>,
+		 typename NodeAllocator = SLListStandardNodeAllocator<Value, Node>,
+		 typename GetValue = SLListStandardGetValue<Value, Node> >
+class SLList {
+public:
+	class Iterator;
+
+public:
+	SLList();
+	SLList(const NodeAllocator &nodeAllocator, const GetValue &getValue);
+	~SLList();
+
+	bool Insert(const Value &value, Iterator *iterator = NULL);
+	bool Remove(const Value &value);
+	void Remove(Iterator &iterator);
+	void RemoveAll();
+
+	bool Find(const Value &value, Iterator *iterator = NULL) const;
+	void GetIterator(Iterator *iterator) const;
+
+private:
+	friend class Iterator;
+
+	Node			*fHead;
+	NodeAllocator	fNodeAllocator;
+	GetValue		fGetValue;
+};
+
+// Iterator
+SL_LIST_TEMPLATE_LIST
+class SL_LIST_CLASS_NAME::Iterator {
+public:
+	Iterator() : fList(NULL), fCurrent(NULL)	{}
+	~Iterator()	{}
+
+	inline Value *GetCurrent()
+	{
+		return (fList && fCurrent ? &fList->fGetValue(fCurrent) : NULL);
+	}
+
+	inline Value *GetNext()
+	{
+		if (fCurrent)
+			fCurrent = fCurrent->next;
+		return GetCurrent();
+	}
+
+	inline void Remove()
+	{
+		if (fList)
+			fList->Remove(*this);
+	}
+
+private:
+	friend class SL_LIST_CLASS_NAME;
+
+	inline void _SetTo(SL_LIST_CLASS_NAME *list, Node *previous, Node *node)
+	{
+		fList = list;
+		fPrevious = previous;
+		fCurrent = node;
+	}
+
+	inline SL_LIST_CLASS_NAME *_GetList() const	{ return fList; }
+	inline Node *_GetPreviousNode() const		{ return fPrevious; }
+	inline Node *_GetCurrentNode() const		{ return fCurrent; }
+
+private:
+	SL_LIST_CLASS_NAME	*fList;
+	Node				*fPrevious;
+	Node				*fCurrent;
+};
+
+// constructor
+SL_LIST_TEMPLATE_LIST
+SL_LIST_CLASS_NAME::SLList()
+	: fHead(NULL)/*,
+	  fNodeAllocator(),
+	  fGetValue()*/
+{
+}
+
+// constructor
+SL_LIST_TEMPLATE_LIST
+SL_LIST_CLASS_NAME::SLList(const NodeAllocator &nodeAllocator,
+						   const GetValue &getValue)
+	: fHead(NULL),
+	  fNodeAllocator(nodeAllocator),
+	  fGetValue(getValue)
+{
+}
+
+// destructor
+SL_LIST_TEMPLATE_LIST
+SL_LIST_CLASS_NAME::~SLList()
+{
+	RemoveAll();
+}
+
+// Insert
+SL_LIST_TEMPLATE_LIST
+bool
+SL_LIST_CLASS_NAME::Insert(const Value &value, Iterator *iterator)
+{
+	Node *node = fNodeAllocator.Allocate(value);
+	if (node) {
+		node->next = fHead;
+		fHead = node;
+		if (iterator)
+			iterator->_SetTo(this, NULL, node);
+	}
+	return node;
+}
+
+// Remove
+SL_LIST_TEMPLATE_LIST
+bool
+SL_LIST_CLASS_NAME::Remove(const Value &value)
+{
+	Iterator iterator;
+	bool result = Find(value, &iterator);
+	if (result)
+		iterator.Remove();
+	return result;
+}
+
+// Remove
+SL_LIST_TEMPLATE_LIST
+void
+SL_LIST_CLASS_NAME::Remove(Iterator &iterator)
+{
+	Node *node = iterator._GetCurrentNode();
+	if (iterator._GetList() == this && node) {
+		Node *previous = iterator._GetPreviousNode();
+		iterator._SetTo(this, previous, node->next);
+		if (previous)
+			previous->next = node->next;
+		else
+			fHead = node->next;
+		fNodeAllocator.Free(node);
+	}
+}
+
+// RemoveAll
+SL_LIST_TEMPLATE_LIST
+void
+SL_LIST_CLASS_NAME::RemoveAll()
+{
+	for (Node *node = fHead; node; ) {
+		Node *next = node->next;
+		fNodeAllocator.Free(node);
+		node = next;
+	}
+	fHead = NULL;
+}
+
+// Find
+SL_LIST_TEMPLATE_LIST
+bool
+SL_LIST_CLASS_NAME::Find(const Value &value, Iterator *iterator) const
+{
+	Node *node = fHead;
+	Node *previous = NULL;
+	while (node && fGetValue(node) != value) {
+		previous = node;
+		node = node->next;
+	}
+	if (node && iterator) {
+		iterator->_SetTo(const_cast<SL_LIST_CLASS_NAME*>(this), previous,
+						 node);
+	}
+	return node;
+}
+
+// GetIterator
+SL_LIST_TEMPLATE_LIST
+void
+SL_LIST_CLASS_NAME::GetIterator(Iterator *iterator) const
+{
+	if (iterator)
+		iterator->_SetTo(const_cast<SL_LIST_CLASS_NAME*>(this), NULL, fHead);
+}
+
+#endif	// SL_LIST_H

src/add-ons/kernel/file_systems/ramfs/SizeIndex.cpp

@@ -0,0 +1,371 @@
+// SizeIndex.cpp
+
+#include <TypeConstants.h>
+
+#include "Entry.h"
+#include "EntryListener.h"
+#include "IndexImpl.h"
+#include "Node.h"
+#include "NodeListener.h"
+#include "SizeIndex.h"
+#include "Volume.h"
+
+// SizeIndexPrimaryKey
+class SizeIndexPrimaryKey {
+public:
+	SizeIndexPrimaryKey(Node *node, off_t size)
+		: node(node), size(size) {}
+	SizeIndexPrimaryKey(Node *node)
+		: node(node), size(node->GetSize()) {}
+	SizeIndexPrimaryKey(off_t size)
+		: node(NULL), size(size) {}
+
+	Node	*node;
+	off_t	size;
+};
+
+// SizeIndexGetPrimaryKey
+class SizeIndexGetPrimaryKey {
+public:
+	inline SizeIndexPrimaryKey operator()(Node *a)
+	{
+		return SizeIndexPrimaryKey(a);
+	}
+
+	inline SizeIndexPrimaryKey operator()(Node *a) const
+	{
+		return SizeIndexPrimaryKey(a);
+	}
+};
+
+// SizeIndexPrimaryKeyCompare
+class SizeIndexPrimaryKeyCompare
+{
+public:
+	inline int operator()(const SizeIndexPrimaryKey &a,
+						  const SizeIndexPrimaryKey &b) const
+	{
+		if (a.node != NULL && a.node == b.node)
+			return 0;
+		if (a.size < b.size)
+			return -1;
+		if (a.size > b.size)
+			return 1;
+		return 0;
+	}
+};
+
+
+// NodeTree
+typedef TwoKeyAVLTree<Node*, SizeIndexPrimaryKey,
+					  SizeIndexPrimaryKeyCompare,
+					  SizeIndexGetPrimaryKey>
+		_NodeTree;
+class SizeIndex::NodeTree : public _NodeTree {};
+
+
+// IteratorList
+class SizeIndex::IteratorList : public DLList<Iterator> {};
+
+
+// Iterator
+class SizeIndex::Iterator
+	: public NodeEntryIterator<SizeIndex::NodeTree::Iterator>,
+	  public DLListLinkImpl<Iterator>, public EntryListener,
+	  public NodeListener {
+public:
+	Iterator();
+	virtual ~Iterator();
+
+	virtual Entry *GetCurrent();
+	virtual Entry *GetCurrent(uint8 *buffer, size_t *keyLength);
+
+	virtual status_t Suspend();
+	virtual status_t Resume();
+
+	bool SetTo(SizeIndex *index, off_t size, bool ignoreValue = false);
+	void Unset();
+
+	virtual void EntryRemoved(Entry *entry);
+	virtual void NodeRemoved(Node *node);
+
+private:
+	typedef NodeEntryIterator<SizeIndex::NodeTree::Iterator> BaseClass;
+
+private:
+	SizeIndex						*fIndex;
+};
+
+
+// SizeIndex
+
+// constructor
+SizeIndex::SizeIndex(Volume *volume)
+	: Index(volume, "size", B_INT64_TYPE, true, sizeof(off_t)),
+	  fNodes(new(nothrow) NodeTree),
+	  fIterators(new(nothrow) IteratorList)
+{
+	if (fInitStatus == B_OK && (!fNodes || !fIterators))
+		fInitStatus = B_NO_MEMORY;
+	if (fInitStatus == B_OK) {
+		fInitStatus = fVolume->AddNodeListener(this,
+			NULL, NODE_LISTEN_ANY_NODE | NODE_LISTEN_ALL);
+	}
+}
+
+// destructor
+SizeIndex::~SizeIndex()
+{
+	if (fVolume)
+		fVolume->RemoveNodeListener(this, NULL);
+	if (fIterators) {
+		// unset the iterators
+		for (Iterator *iterator = fIterators->GetFirst();
+			 iterator;
+			 iterator = fIterators->GetNext(iterator)) {
+			iterator->SetTo(NULL, 0);
+		}
+		delete fIterators;
+	}
+	if (fNodes)
+		delete fNodes;
+}
+
+// CountEntries
+int32
+SizeIndex::CountEntries() const
+{
+	return fNodes->CountItems();
+}
+
+// Changed
+status_t
+SizeIndex::Changed(Node *node, off_t oldSize)
+{
+	status_t error = B_BAD_VALUE;
+	if (node) {
+		NodeTree::Iterator it;
+		Node **foundNode = fNodes->Find(SizeIndexPrimaryKey(node, oldSize),
+										node, &it);
+		if (foundNode && *foundNode == node) {
+			// update the iterators
+			for (Iterator *iterator = fIterators->GetFirst();
+				 iterator;
+				 iterator = fIterators->GetNext(iterator)) {
+				if (iterator->GetCurrentNode() == node)
+					iterator->NodeRemoved(node);
+			}
+
+			// remove and re-insert the node
+			fNodes->Remove(it);
+			error = fNodes->Insert(node);
+
+			// udpate live queries
+			off_t newSize = node->GetSize();
+			fVolume->UpdateLiveQueries(NULL, node, GetName(), GetType(),
+				(const uint8*)&oldSize, sizeof(oldSize), (const uint8*)&newSize,
+				sizeof(newSize));
+		}
+	}
+	return error;
+}
+
+// NodeAdded
+void
+SizeIndex::NodeAdded(Node *node)
+{
+	if (node)
+		fNodes->Insert(node);
+}
+
+// NodeRemoved
+void
+SizeIndex::NodeRemoved(Node *node)
+{
+	if (node)
+		fNodes->Remove(node, node);
+}
+
+// InternalGetIterator
+AbstractIndexEntryIterator *
+SizeIndex::InternalGetIterator()
+{
+	Iterator *iterator = new(nothrow) Iterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, 0, true)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// InternalFind
+AbstractIndexEntryIterator *
+SizeIndex::InternalFind(const uint8 *key, size_t length)
+{
+	if (!key || length != sizeof(off_t))
+		return NULL;
+	Iterator *iterator = new(nothrow) Iterator;
+	if (iterator) {
+		if (!iterator->SetTo(this, *(const off_t*)key)) {
+			delete iterator;
+			iterator = NULL;
+		}
+	}
+	return iterator;
+}
+
+// _AddIterator
+void
+SizeIndex::_AddIterator(Iterator *iterator)
+{
+	fIterators->Insert(iterator);
+}
+
+// _RemoveIterator
+void
+SizeIndex::_RemoveIterator(Iterator *iterator)
+{
+	fIterators->Remove(iterator);
+}
+
+
+// Iterator
+
+// constructor
+SizeIndex::Iterator::Iterator()
+	: BaseClass(),
+	  fIndex(NULL)
+{
+}
+
+// destructor
+SizeIndex::Iterator::~Iterator()
+{
+	SetTo(NULL, 0);
+}
+
+// GetCurrent
+Entry *
+SizeIndex::Iterator::GetCurrent()
+{
+	return BaseClass::GetCurrent();
+}
+
+// GetCurrent
+Entry *
+SizeIndex::Iterator::GetCurrent(uint8 *buffer, size_t *keyLength)
+{
+	Entry *entry = GetCurrent();
+	if (entry) {
+		*(off_t*)buffer = entry->GetNode()->GetSize();
+		*keyLength = sizeof(size_t);
+	}
+	return entry;
+}
+
+// Suspend
+status_t
+SizeIndex::Iterator::Suspend()
+{
+	status_t error = BaseClass::Suspend();
+	if (error == B_OK) {
+		if (fNode) {
+			error = fIndex->GetVolume()->AddNodeListener(this, fNode,
+														 NODE_LISTEN_REMOVED);
+			if (error == B_OK && fEntry) {
+				error = fIndex->GetVolume()->AddEntryListener(this, fEntry,
+					ENTRY_LISTEN_REMOVED);
+				if (error != B_OK)
+					fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+			}
+			if (error != B_OK)
+				BaseClass::Resume();
+		}
+	}
+	return error;
+}
+
+// Resume
+status_t
+SizeIndex::Iterator::Resume()
+{
+	status_t error = BaseClass::Resume();
+	if (error == B_OK) {
+		if (fEntry)
+			error = fIndex->GetVolume()->RemoveEntryListener(this, fEntry);
+		if (fNode) {
+			if (error == B_OK)
+				error = fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+			else
+				fIndex->GetVolume()->RemoveNodeListener(this, fNode);
+		}
+	}
+	return error;
+}
+
+// SetTo
+bool
+SizeIndex::Iterator::SetTo(SizeIndex *index, off_t size, bool ignoreValue)
+{
+	Resume();
+	Unset();
+	// set the new values
+	fIndex = index;
+	if (fIndex)
+		fIndex->_AddIterator(this);
+	fInitialized = fIndex;
+	// get the node's first entry
+	if (fIndex) {
+		// get the first node
+		bool found = true;
+		if (ignoreValue)
+			fIndex->fNodes->GetIterator(&fIterator);
+		else
+			found = fIndex->fNodes->FindFirst(size, &fIterator);
+		// get the first entry
+		if (found) {
+			if (Node **nodeP = fIterator.GetCurrent()) {
+				fNode = *nodeP;
+				fEntry = fNode->GetFirstReferrer();
+				if (!fEntry)
+					BaseClass::GetNext();
+				if (!ignoreValue && fNode && fNode->GetSize() != size)
+					Unset();
+			}
+		}
+	}
+	return fEntry;
+}
+
+// Unset
+void
+SizeIndex::Iterator::Unset()
+{
+	if (fIndex) {
+		fIndex->_RemoveIterator(this);
+		fIndex = NULL;
+	}
+	BaseClass::Unset();
+}
+
+// EntryRemoved
+void
+SizeIndex::Iterator::EntryRemoved(Entry */*entry*/)
+{
+	Resume();
+	fIsNext = BaseClass::GetNext();
+	Suspend();
+}
+
+// NodeRemoved
+void
+SizeIndex::Iterator::NodeRemoved(Node */*node*/)
+{
+	Resume();
+	fEntry = NULL;
+	fIsNext = BaseClass::GetNext();
+	Suspend();
+}
+

src/add-ons/kernel/file_systems/ramfs/SizeIndex.h

@@ -0,0 +1,44 @@
+// SizeIndex.h
+
+#ifndef SIZE_INDEX_H
+#define SIZE_INDEX_H
+
+#include "Index.h"
+#include "NodeListener.h"
+#include "TwoKeyAVLTree.h"
+
+// SizeIndex
+class SizeIndex : public Index, private NodeListener {
+public:
+	SizeIndex(Volume *volume);
+	virtual ~SizeIndex();
+
+	virtual int32 CountEntries() const;
+
+	virtual status_t Changed(Node *node, off_t oldSize);
+
+private:
+	virtual void NodeAdded(Node *node);
+	virtual void NodeRemoved(Node *node);
+
+protected:
+	virtual AbstractIndexEntryIterator *InternalGetIterator();
+	virtual AbstractIndexEntryIterator *InternalFind(const uint8 *key,
+													 size_t length);
+
+private:
+	class Iterator;
+	class IteratorList;
+	class NodeTree;
+	friend class Iterator;
+
+private:
+	void _AddIterator(Iterator *iterator);
+	void _RemoveIterator(Iterator *iterator);
+
+private:
+	NodeTree		*fNodes;
+	IteratorList	*fIterators;
+};
+
+#endif	// SIZE_INDEX_H

src/add-ons/kernel/file_systems/ramfs/Stack.h

@@ -0,0 +1,78 @@
+/* Stack - a template stack class (plus some handy methods)
+ *
+ * Copyright 2001-2005, Axel Dörfler, axeld@pinc-software.de.
+ * This file may be used under the terms of the MIT License.
+ */
+#ifndef KERNEL_UTIL_STACK_H
+#define KERNEL_UTIL_STACK_H
+
+
+#include <SupportDefs.h>
+
+
+template<class T> class Stack {
+	public:
+		Stack()
+			:
+			fArray(NULL),
+			fUsed(0),
+			fMax(0)
+		{
+		}
+
+		~Stack()
+		{
+			free(fArray);
+		}
+
+		bool IsEmpty() const
+		{
+			return fUsed == 0;
+		}
+
+		void MakeEmpty()
+		{
+			// could also free the memory
+			fUsed = 0;
+		}
+
+		status_t Push(T value)
+		{
+			if (fUsed >= fMax) {
+				fMax += 16;
+				T *newArray = (T *)realloc(fArray, fMax * sizeof(T));
+				if (newArray == NULL)
+					return B_NO_MEMORY;
+
+				fArray = newArray;
+			}
+			fArray[fUsed++] = value;
+			return B_OK;
+		}
+
+		bool Pop(T *value)
+		{
+			if (fUsed == 0)
+				return false;
+
+			*value = fArray[--fUsed];
+			return true;
+		}
+
+		T *Array()
+		{
+			return fArray;
+		}
+
+		int32 CountItems() const
+		{
+			return fUsed;
+		}
+
+	private:
+		T		*fArray;
+		int32	fUsed;
+		int32	fMax;
+};
+
+#endif	/* KERNEL_UTIL_STACK_H */

src/add-ons/kernel/file_systems/ramfs/SymLink.cpp

@@ -0,0 +1,70 @@
+// SymLink.cpp
+
+#include <limits.h>
+
+#include "AllocationInfo.h"
+#include "Debug.h"
+#include "SizeIndex.h"
+#include "SymLink.h"
+#include "Volume.h"
+
+// constructor
+SymLink::SymLink(Volume *volume)
+	: Node(volume, NODE_TYPE_SYMLINK),
+	  fLinkedPath()
+{
+}
+
+// destructor
+SymLink::~SymLink()
+{
+}
+
+// SetSize
+status_t
+SymLink::SetSize(off_t newSize)
+{
+	status_t error = (newSize >= 0 && newSize < PATH_MAX ? B_OK : B_BAD_VALUE);
+	int32 oldSize = GetLinkedPathLength();
+	if (error == B_OK && newSize < oldSize) {
+		fLinkedPath.Truncate(newSize);
+		MarkModified();
+		// update the size index
+		if (SizeIndex *index = GetVolume()->GetSizeIndex())
+			index->Changed(this, oldSize);
+	}
+	return error;
+}
+
+// GetSize
+off_t
+SymLink::GetSize() const
+{
+	return GetLinkedPathLength();
+}
+
+// SetLinkedPath
+status_t
+SymLink::SetLinkedPath(const char *path)
+{
+	int32 oldLen = GetLinkedPathLength();
+	int32 len = strnlen(path, PATH_MAX - 1);
+	if (fLinkedPath.SetTo(path, len)) {
+		MarkModified();
+		// update the size index, if necessary
+		if (len != oldLen) {
+			if (SizeIndex *index = GetVolume()->GetSizeIndex())
+				index->Changed(this, oldLen);
+		}
+		return B_OK;
+	}
+	RETURN_ERROR(B_NO_MEMORY);
+}
+
+// GetAllocationInfo
+void
+SymLink::GetAllocationInfo(AllocationInfo &info)
+{
+	info.AddSymLinkAllocation(GetSize());
+}
+

src/add-ons/kernel/file_systems/ramfs/SymLink.h

@@ -0,0 +1,28 @@
+// SymLink.h
+
+#ifndef SYMLINK_H
+#define SYMLINK_H
+
+#include "Node.h"
+#include "String.h"
+
+class SymLink : public Node {
+public:
+	SymLink(Volume *volume);
+	virtual ~SymLink();
+
+	virtual status_t SetSize(off_t newSize);
+	virtual off_t GetSize() const;
+
+	status_t SetLinkedPath(const char *path);
+	const char *GetLinkedPath() const { return fLinkedPath.GetString(); }
+	size_t GetLinkedPathLength() const { return fLinkedPath.GetLength(); }
+
+	// debugging
+	virtual void GetAllocationInfo(AllocationInfo &info);
+
+private:
+	String	fLinkedPath;
+};
+
+#endif	// SYMLINK_H

src/add-ons/kernel/file_systems/ramfs/TwoKeyAVLTree.h

@@ -0,0 +1,304 @@
+// TwoKeyAVLTree.h
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+// 
+// Except as contained in this notice, the name of a copyright holder shall
+// not be used in advertising or otherwise to promote the sale, use or other
+// dealings in this Software without prior written authorization of the
+// copyright holder.
+
+#ifndef TWO_KEY_AVL_TREE_H
+#define TWO_KEY_AVL_TREE_H
+
+#include "AVLTree.h"
+
+// TwoKeyAVLTreeKey
+template<typename PrimaryKey, typename SecondaryKey>
+class TwoKeyAVLTreeKey {
+public:
+	inline TwoKeyAVLTreeKey(const PrimaryKey &primary,
+							const SecondaryKey &secondary)
+		: primary(primary),
+		  secondary(secondary),
+		  use_secondary(true)
+	{
+	}
+
+	inline TwoKeyAVLTreeKey(const PrimaryKey *primary)
+		: primary(primary),
+		  secondary(NULL),
+		  use_secondary(false)
+	{
+	}
+
+	PrimaryKey		primary;
+	SecondaryKey	secondary;
+	bool			use_secondary;
+};
+
+// TwoKeyAVLTreeKeyCompare
+template<typename PrimaryKey, typename SecondaryKey,
+		 typename PrimaryKeyCompare, typename SecondaryKeyCompare>
+class TwoKeyAVLTreeKeyCompare {
+private:
+	typedef TwoKeyAVLTreeKey<PrimaryKey, SecondaryKey> Key;
+
+public:
+	inline TwoKeyAVLTreeKeyCompare(const PrimaryKeyCompare &primary,
+								   const SecondaryKeyCompare &secondary)
+		: fPrimaryKeyCompare(primary), fSecondaryKeyCompare(secondary) {}
+
+	inline int operator()(const Key &a, const Key &b) const
+	{
+		int result = fPrimaryKeyCompare(a.primary, b.primary);
+		if (result == 0 && a.use_secondary && b.use_secondary)
+			result = fSecondaryKeyCompare(a.secondary, b.secondary);
+		return result;
+	}
+
+private:
+	PrimaryKeyCompare	fPrimaryKeyCompare;
+	SecondaryKeyCompare	fSecondaryKeyCompare;
+};
+
+// TwoKeyAVLTreeGetKey
+template<typename Value, typename PrimaryKey, typename SecondaryKey,
+		 typename GetPrimaryKey, typename GetSecondaryKey>
+class TwoKeyAVLTreeGetKey
+{
+private:
+	typedef TwoKeyAVLTreeKey<PrimaryKey, SecondaryKey> Key;
+
+public:
+	TwoKeyAVLTreeGetKey(const GetPrimaryKey &getPrimary,
+						const GetSecondaryKey &getSecondary)
+		: fGetPrimaryKey(getPrimary),
+		  fGetSecondaryKey(getSecondary)
+	{
+	}
+
+	inline Key operator()(const Value &a) const
+	{
+		return Key(fGetPrimaryKey(a), fGetSecondaryKey(a));
+	}
+
+private:
+	GetPrimaryKey	fGetPrimaryKey;
+	GetSecondaryKey	fGetSecondaryKey;
+};
+
+// for convenience
+#define TWO_KEY_AVL_TREE_TEMPLATE_LIST template<typename Value, \
+	typename PrimaryKey, typename PrimaryKeyCompare, \
+	typename GetPrimaryKey, typename SecondaryKey, typename Node, \
+	typename SecondaryKeyCompare, typename GetSecondaryKey, \
+	typename NodeAllocator, typename GetValue>
+#define TWO_KEY_AVL_TREE_CLASS_NAME TwoKeyAVLTree<Value, PrimaryKey, \
+	PrimaryKeyCompare, GetPrimaryKey, SecondaryKey, Node, \
+	SecondaryKeyCompare, GetSecondaryKey, NodeAllocator, GetValue>
+
+// TwoKeyAVLTree
+template<typename Value, typename PrimaryKey,
+		 typename PrimaryKeyCompare, typename GetPrimaryKey,
+		 typename SecondaryKey = Value,
+		 typename Node = AVLTreeStandardNode<Value>,
+		 typename SecondaryKeyCompare = AVLTreeStandardCompare<SecondaryKey>,
+		 typename GetSecondaryKey = AVLTreeStandardGetKey<Value, SecondaryKey>,
+		 typename NodeAllocator = AVLTreeStandardNodeAllocator<Value, Node>,
+		 typename GetValue = AVLTreeStandardGetValue<Value, Node> >
+class TwoKeyAVLTree : private AVLTree<Value,
+	TwoKeyAVLTreeKey<PrimaryKey, SecondaryKey>, Node,
+	TwoKeyAVLTreeKeyCompare<PrimaryKey, SecondaryKey, PrimaryKeyCompare,
+							SecondaryKeyCompare>,
+	TwoKeyAVLTreeGetKey<Value, PrimaryKey, SecondaryKey, GetPrimaryKey,
+						GetSecondaryKey>,
+	NodeAllocator, GetValue> {
+private:
+	typedef TwoKeyAVLTreeKey<PrimaryKey, SecondaryKey> Key;
+	typedef TwoKeyAVLTreeKeyCompare<PrimaryKey, SecondaryKey,
+									PrimaryKeyCompare, SecondaryKeyCompare>
+			KeyCompare;
+	typedef TwoKeyAVLTreeGetKey<Value, PrimaryKey, SecondaryKey, GetPrimaryKey,
+								GetSecondaryKey>
+			GetKey;
+	typedef AVLTree<Value, Key, Node, KeyCompare, GetKey, NodeAllocator,
+					GetValue> BaseClass;
+
+public:
+	TwoKeyAVLTree();
+	TwoKeyAVLTree(const PrimaryKeyCompare &primaryCompare,
+				  const GetPrimaryKey &getPrimary,
+				  const SecondaryKeyCompare &secondaryCompare,
+				  const GetSecondaryKey &getSecondary,
+				  const NodeAllocator &allocator,
+				  const GetValue &getValue);
+	~TwoKeyAVLTree();
+
+	inline int CountItems() const	{ return BaseClass::CountItems(); }
+
+	Value *FindFirst(const PrimaryKey &key, Iterator *iterator = NULL);
+	Value *FindLast(const PrimaryKey &key, Iterator *iterator = NULL);
+	inline Value *Find(const PrimaryKey &primaryKey,
+					   const SecondaryKey &secondaryKey,
+					   Iterator *iterator = NULL);
+
+	inline void GetIterator(Iterator *iterator, bool reverse = false);
+
+	inline status_t Insert(const Value &value, Iterator *iterator = NULL);
+	inline status_t Remove(const PrimaryKey &primaryKey,
+						   const SecondaryKey &secondaryKey);
+	inline void Remove(Iterator &iterator);
+
+private:
+	PrimaryKeyCompare	fPrimaryKeyCompare;
+	GetPrimaryKey		fGetPrimaryKey;
+};
+
+
+// constructor
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+TWO_KEY_AVL_TREE_CLASS_NAME::TwoKeyAVLTree()
+	: BaseClass(KeyCompare(PrimaryKeyCompare(), SecondaryKeyCompare()),
+						   GetKey(GetPrimaryKey(), GetSecondaryKey()),
+						   NodeAllocator(), GetValue())
+{
+}
+
+// constructor
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+TWO_KEY_AVL_TREE_CLASS_NAME::TwoKeyAVLTree(
+	const PrimaryKeyCompare &primaryCompare, const GetPrimaryKey &getPrimary,
+	const SecondaryKeyCompare &secondaryCompare,
+	const GetSecondaryKey &getSecondary, const NodeAllocator &allocator,
+	const GetValue &getValue)
+	: BaseClass(KeyCompare(primaryCompare, secondaryCompare),
+						   GetKey(getPrimary, getSecondary),
+						   allocator, getValue),
+	  fPrimaryKeyCompare(primaryCompare),
+	  fGetPrimaryKey(getPrimary)
+	  
+{
+}
+
+// destructor
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+TWO_KEY_AVL_TREE_CLASS_NAME::~TwoKeyAVLTree()
+{
+}
+
+// FindFirst
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+Value *
+TWO_KEY_AVL_TREE_CLASS_NAME::FindFirst(const PrimaryKey &key,
+									   Iterator *iterator)
+{
+	Node *node = fRoot;
+	while (node) {
+		int cmp = fPrimaryKeyCompare(key, fGetPrimaryKey(fGetValue(node)));
+		if (cmp == 0) {
+			// found a matching node, now get the left-most node with that key
+			while (node->left && fPrimaryKeyCompare(key,
+				   		fGetPrimaryKey(fGetValue(node->left))) == 0) {
+				node = node->left;
+			}
+			if (iterator)
+				_InitIterator(iterator, node);
+			return &fGetValue(node);
+		}
+		if (cmp < 0)
+			node = node->left;
+		else
+			node = node->right;
+	}
+	return NULL;
+}
+
+// FindLast
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+Value *
+TWO_KEY_AVL_TREE_CLASS_NAME::FindLast(const PrimaryKey &key,
+									  Iterator *iterator)
+{
+	Node *node = fRoot;
+	while (node) {
+		int cmp = fPrimaryKeyCompare(key, fGetPrimaryKey(fGetValue(node)));
+		if (cmp == 0) {
+			// found a matching node, now get the right-most node with that key
+			while (node->right && fPrimaryKeyCompare(key,
+				   		fGetPrimaryKey(fGetValue(node->right))) == 0) {
+				node = node->right;
+			}
+			if (iterator)
+				_InitIterator(iterator, node);
+			return &fGetValue(node);
+		}
+		if (cmp < 0)
+			node = node->left;
+		else
+			node = node->right;
+	}
+	return NULL;
+}
+
+// Find
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+Value *
+TWO_KEY_AVL_TREE_CLASS_NAME::Find(const PrimaryKey &primaryKey,
+								  const SecondaryKey &secondaryKey,
+								  Iterator *iterator)
+{
+	return BaseClass::Find(Key(primaryKey, secondaryKey), iterator);
+}
+
+// GetIterator
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+void
+TWO_KEY_AVL_TREE_CLASS_NAME::GetIterator(Iterator *iterator, bool reverse)
+{
+	BaseClass::GetIterator(iterator, reverse);
+}
+
+// Insert
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+status_t
+TWO_KEY_AVL_TREE_CLASS_NAME::Insert(const Value &value, Iterator *iterator)
+{
+	return BaseClass::Insert(value, iterator);
+}
+
+// Remove
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+status_t
+TWO_KEY_AVL_TREE_CLASS_NAME::Remove(const PrimaryKey &primaryKey,
+									const SecondaryKey &secondaryKey)
+{
+	return BaseClass::Remove(Key(primaryKey, secondaryKey));
+}
+
+// Remove
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+void
+TWO_KEY_AVL_TREE_CLASS_NAME::Remove(Iterator &iterator)
+{
+	BaseClass::Remove(iterator);
+}
+
+#endif	// TWO_KEY_AVL_TREE_H

src/add-ons/kernel/file_systems/ramfs/Volume.cpp

@@ -0,0 +1,895 @@
+// Volume.cpp
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// 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 Foundation; either version 2 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+// You can alternatively use *this file* under the terms of the the MIT
+// license included in this package.
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "Block.h"
+#include "BlockAllocator.h"
+#include "Debug.h"
+#include "Directory.h"
+#include "Entry.h"
+#include "EntryListener.h"
+#include "IndexDirectory.h"
+#include "Locking.h"
+#include "Misc.h"
+#include "NameIndex.h"
+#include "Node.h"
+#include "NodeChildTable.h"
+#include "NodeListener.h"
+#include "NodeTable.h"
+#include "TwoKeyAVLTree.h"
+#include "Volume.h"
+
+// default block size
+static const off_t kDefaultBlockSize = 4096;
+
+static const size_t kDefaultAreaSize = kDefaultBlockSize * 128;
+
+// default volume name
+static const char *kDefaultVolumeName = "RAM FS";
+
+// NodeListenerGetPrimaryKey
+class NodeListenerGetPrimaryKey {
+public:
+	inline Node *operator()(const NodeListenerValue &a)
+	{
+		return a.node;
+	}
+
+	inline Node *operator()(const NodeListenerValue &a) const
+	{
+		return a.node;
+	}
+};
+
+// NodeListenerGetSecondaryKey
+class NodeListenerGetSecondaryKey {
+public:
+	inline NodeListener *operator()(const NodeListenerValue &a)
+	{
+		return a.listener;
+	}
+
+	inline NodeListener *operator()(const NodeListenerValue &a) const
+	{
+		return a.listener;
+	}
+};
+
+// NodeListenerTree
+typedef TwoKeyAVLTree<NodeListenerValue, Node*,
+					  AVLTreeStandardCompare<Node*>,
+					  NodeListenerGetPrimaryKey, NodeListener*,
+					  AVLTreeStandardNode<NodeListenerValue>,
+					  AVLTreeStandardCompare<NodeListener*>,
+					  NodeListenerGetSecondaryKey > _NodeListenerTree;
+class NodeListenerTree : public _NodeListenerTree {};
+
+// EntryListenerGetPrimaryKey
+class EntryListenerGetPrimaryKey {
+public:
+	inline Entry *operator()(const EntryListenerValue &a)
+	{
+		return a.entry;
+	}
+
+	inline Entry *operator()(const EntryListenerValue &a) const
+	{
+		return a.entry;
+	}
+};
+
+// EntryListenerGetSecondaryKey
+class EntryListenerGetSecondaryKey {
+public:
+	inline EntryListener *operator()(const EntryListenerValue &a)
+	{
+		return a.listener;
+	}
+
+	inline EntryListener *operator()(const EntryListenerValue &a) const
+	{
+		return a.listener;
+	}
+};
+
+// EntryListenerTree
+typedef TwoKeyAVLTree<EntryListenerValue, Entry*,
+					  AVLTreeStandardCompare<Entry*>,
+					  EntryListenerGetPrimaryKey, EntryListener*,
+					  AVLTreeStandardNode<EntryListenerValue>,
+					  AVLTreeStandardCompare<EntryListener*>,
+					  EntryListenerGetSecondaryKey > _EntryListenerTree;
+class EntryListenerTree : public _EntryListenerTree {};
+
+
+/*!
+	\class Volume
+	\brief Represents a volume.
+*/
+
+// constructor
+Volume::Volume()
+	: fID(0),
+	  fNextNodeID(kRootParentID + 1),
+	  fNodeTable(NULL),
+	  fDirectoryEntryTable(NULL),
+	  fNodeAttributeTable(NULL),
+	  fIndexDirectory(NULL),
+	  fRootDirectory(NULL),
+	  fName(kDefaultVolumeName),
+	  fLocker("volume"),
+	  fIteratorLocker("iterators"),
+	  fQueryLocker("queries"),
+	  fNodeListeners(NULL),
+	  fAnyNodeListeners(),
+	  fEntryListeners(NULL),
+	  fAnyEntryListeners(),
+	  fBlockAllocator(NULL),
+	  fBlockSize(kDefaultBlockSize),
+	  fAllocatedBlocks(0),
+	  fAccessTime(0),
+	  fMounted(false)
+{
+}
+
+// destructor
+Volume::~Volume()
+{
+	Unmount();
+}
+
+// Mount
+status_t
+Volume::Mount(nspace_id id)
+{
+	Unmount();
+
+	// check the locker's semaphores
+	if (fLocker.Sem() < 0)
+		return fLocker.Sem();
+	if (fIteratorLocker.Sem() < 0)
+		return fIteratorLocker.Sem();
+	if (fQueryLocker.Sem() < 0)
+		return fQueryLocker.Sem();
+
+	status_t error = B_OK;
+	fID = id;
+	// create a block allocator
+	if (error == B_OK) {
+		fBlockAllocator = new(nothrow) BlockAllocator(kDefaultAreaSize);
+		if (fBlockAllocator)
+			error = fBlockAllocator->InitCheck();
+		else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	// create the listener trees
+	if (error == B_OK) {
+		fNodeListeners = new(nothrow) NodeListenerTree;
+		if (!fNodeListeners)
+			error = B_NO_MEMORY;
+	}
+	if (error == B_OK) {
+		fEntryListeners = new(nothrow) EntryListenerTree;
+		if (!fEntryListeners)
+			error = B_NO_MEMORY;
+	}
+	// create the node table
+	if (error == B_OK) {
+		fNodeTable = new(nothrow) NodeTable;
+		if (fNodeTable)
+			error = fNodeTable->InitCheck();
+		else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	// create the directory entry table
+	if (error == B_OK) {
+		fDirectoryEntryTable = new(nothrow) DirectoryEntryTable;
+		if (fDirectoryEntryTable)
+			error = fDirectoryEntryTable->InitCheck();
+		else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	// create the node attribute table
+	if (error == B_OK) {
+		fNodeAttributeTable = new(nothrow) NodeAttributeTable;
+		if (fNodeAttributeTable)
+			error = fNodeAttributeTable->InitCheck();
+		else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	// create the index directory
+	if (error == B_OK) {
+		fIndexDirectory = new(nothrow) IndexDirectory(this);
+		if (!fIndexDirectory)
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	// create the root dir
+	if (error == B_OK) {
+		fRootDirectory = new(nothrow) Directory(this);
+		if (fRootDirectory) {
+			// set permissions: -rwxr-xr-x
+			fRootDirectory->SetMode(
+				S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
+			error = fRootDirectory->Link(NULL);
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	// set mounted flag / cleanup on error
+	if (error == B_OK)
+		fMounted = true;
+	else
+		Unmount();
+	RETURN_ERROR(error);
+}
+
+// Unmount
+status_t
+Volume::Unmount()
+{
+	fMounted = false;
+	// delete the root directory
+	if (fRootDirectory) {
+		// deleting the root directory destroys the complete hierarchy
+		delete fRootDirectory;
+		fRootDirectory = NULL;
+	}
+	// delete the index directory
+	if (fIndexDirectory) {
+		delete fIndexDirectory;
+		fIndexDirectory = NULL;
+	}
+	// delete the listener trees
+	if (fEntryListeners) {
+		delete fEntryListeners;
+		fEntryListeners = NULL;
+	}
+	if (fNodeListeners) {
+		delete fNodeListeners;
+		fNodeListeners = NULL;
+	}
+	// delete the tables
+	if (fNodeAttributeTable) {
+		delete fNodeAttributeTable;
+		fNodeAttributeTable = NULL;
+	}
+	if (fDirectoryEntryTable) {
+		delete fDirectoryEntryTable;
+		fDirectoryEntryTable = NULL;
+	}
+	if (fNodeTable) {
+		delete fNodeTable;
+		fNodeTable = NULL;
+	}
+	// delete the block allocator
+	if (fBlockAllocator) {
+		delete fBlockAllocator;
+		fBlockAllocator = NULL;
+	}
+	fID = 0;
+	return B_OK;
+}
+
+// GetBlockSize
+off_t
+Volume::GetBlockSize() const
+{
+	return fBlockSize;
+}
+
+// CountBlocks
+off_t
+Volume::CountBlocks() const
+{
+	size_t bytes = 0;
+	system_info sysInfo;
+	if (get_system_info(&sysInfo) == B_OK) {
+		int32 freePages = sysInfo.max_pages - sysInfo.used_pages;
+		bytes = (uint32)freePages * B_PAGE_SIZE
+				+ fBlockAllocator->GetAvailableBytes();
+	}
+	return bytes / kDefaultBlockSize;
+}
+
+// CountFreeBlocks
+off_t
+Volume::CountFreeBlocks() const
+{
+	// TODO:...
+	return CountBlocks() - fBlockAllocator->GetUsedBytes() / kDefaultBlockSize;
+}
+
+// SetName
+status_t
+Volume::SetName(const char *name)
+{
+	status_t error = (name ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		if (!fName.SetTo(name))
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// GetName
+const char *
+Volume::GetName() const
+{
+	return fName.GetString();
+}
+
+// NewVNode
+status_t
+Volume::NewVNode(Node *node)
+{
+	status_t error = NodeAdded(node);
+	if (error == B_OK) {
+		error = new_vnode(GetID(), node->GetID(), node);
+		if (error != B_OK)
+			NodeRemoved(node);
+	}
+	return error;
+}
+
+// GetVNode
+status_t
+Volume::GetVNode(vnode_id id, Node **node)
+{
+	return (fMounted ? get_vnode(GetID(), id, (void**)node) : B_BAD_VALUE);
+}
+
+// GetVNode
+status_t
+Volume::GetVNode(Node *node)
+{
+	Node *dummy = NULL;
+	status_t error = (fMounted ? GetVNode(node->GetID(), &dummy)
+							   : B_BAD_VALUE );
+	if (error == B_OK && dummy != node) {
+		FATAL(("Two Nodes have the same ID: %Ld!\n", node->GetID()));
+		PutVNode(dummy);
+		error = B_ERROR;
+	}
+	return error;
+}
+
+// PutVNode
+status_t
+Volume::PutVNode(vnode_id id)
+{
+	return (fMounted ? put_vnode(GetID(), id) : B_BAD_VALUE);
+}
+
+// PutVNode
+status_t
+Volume::PutVNode(Node *node)
+{
+	return (fMounted ? put_vnode(GetID(), node->GetID()) : B_BAD_VALUE);
+}
+
+// RemoveVNode
+status_t
+Volume::RemoveVNode(Node *node)
+{
+	if (fMounted)
+		return remove_vnode(GetID(), node->GetID());
+	status_t error = NodeRemoved(node);
+	if (error == B_OK)
+		delete node;
+	return error;
+}
+
+// UnremoveVNode
+status_t
+Volume::UnremoveVNode(Node *node)
+{
+	return (fMounted ? unremove_vnode(GetID(), node->GetID()) : B_BAD_VALUE);
+}
+
+// NodeAdded
+status_t
+Volume::NodeAdded(Node *node)
+{
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = fNodeTable->AddNode(node);
+		// notify listeners
+		if (error == B_OK) {
+			// listeners interested in that node
+			NodeListenerTree::Iterator it;
+			if (fNodeListeners->FindFirst(node, &it)) {
+				for (NodeListenerValue *value = it.GetCurrent();
+					 value && value->node == node;
+					 value = it.GetNext()) {
+					 if (value->flags & NODE_LISTEN_ADDED)
+						 value->listener->NodeAdded(node);
+				}
+			}
+			// listeners interested in any node
+			int32 count = fAnyNodeListeners.CountItems();
+			for (int32 i = 0; i < count; i++) {
+				const NodeListenerValue &value = fAnyNodeListeners.ItemAt(i);
+				 if (value.flags & NODE_LISTEN_ADDED)
+					 value.listener->NodeAdded(node);
+			}
+		}
+	}
+	return error;
+}
+
+// NodeRemoved
+status_t
+Volume::NodeRemoved(Node *node)
+{
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = fNodeTable->RemoveNode(node);
+		// notify listeners
+		if (error == B_OK) {
+			// listeners interested in that node
+			NodeListenerTree::Iterator it;
+			if (fNodeListeners->FindFirst(node, &it)) {
+				for (NodeListenerValue *value = it.GetCurrent();
+					 value && value->node == node;
+					 value = it.GetNext()) {
+					 if (value->flags & NODE_LISTEN_REMOVED)
+						 value->listener->NodeRemoved(node);
+				}
+			}
+			// listeners interested in any node
+			int32 count = fAnyNodeListeners.CountItems();
+			for (int32 i = 0; i < count; i++) {
+				const NodeListenerValue &value = fAnyNodeListeners.ItemAt(i);
+				 if (value.flags & NODE_LISTEN_REMOVED)
+					 value.listener->NodeRemoved(node);
+			}
+		}
+	}
+	return error;
+}
+
+// FindNode
+/*!	\brief Finds the node identified by a vnode_id.
+
+	\note The method does not initialize the parent ID for non-directory nodes.
+
+	\param id ID of the node to be found.
+	\param node pointer to a pre-allocated Node* to be set to the found node.
+	\return \c B_OK, if everything went fine.
+*/
+status_t
+Volume::FindNode(vnode_id id, Node **node)
+{
+	status_t error = (node ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		*node = fNodeTable->GetNode(id);
+		if (!*node)
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// AddNodeListener
+status_t
+Volume::AddNodeListener(NodeListener *listener, Node *node, uint32 flags)
+{
+	// check parameters
+	if (!listener || !node && !(flags & NODE_LISTEN_ANY_NODE)
+		|| !(flags & NODE_LISTEN_ALL)) {
+		return B_BAD_VALUE;
+	}
+	// add the listener to the right container
+	status_t error = B_OK;
+	NodeListenerValue value(listener, node, flags);
+	if (flags & NODE_LISTEN_ANY_NODE) {
+		if (!fAnyNodeListeners.AddItem(value))
+			error = B_NO_MEMORY;
+	} else
+		error = fNodeListeners->Insert(value);
+	return error;
+}
+
+// RemoveNodeListener
+status_t
+Volume::RemoveNodeListener(NodeListener *listener, Node *node)
+{
+	if (!listener)
+		return B_BAD_VALUE;
+	status_t error = B_OK;
+	if (node)
+		error = fNodeListeners->Remove(node, listener);
+	else {
+		NodeListenerValue value(listener, node, 0);
+		if (!fAnyNodeListeners.RemoveItem(value))
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// EntryAdded
+status_t
+Volume::EntryAdded(vnode_id id, Entry *entry)
+{
+	status_t error = (entry ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = fDirectoryEntryTable->AddNodeChild(id, entry);
+		if (error == B_OK) {
+			// notify listeners
+			// listeners interested in that entry
+			EntryListenerTree::Iterator it;
+			if (fEntryListeners->FindFirst(entry, &it)) {
+				for (EntryListenerValue *value = it.GetCurrent();
+					 value && value->entry == entry;
+					 value = it.GetNext()) {
+					 if (value->flags & ENTRY_LISTEN_ADDED)
+						 value->listener->EntryAdded(entry);
+				}
+			}
+			// listeners interested in any entry
+			int32 count = fAnyEntryListeners.CountItems();
+			for (int32 i = 0; i < count; i++) {
+				const EntryListenerValue &value = fAnyEntryListeners.ItemAt(i);
+				 if (value.flags & ENTRY_LISTEN_ADDED)
+					 value.listener->EntryAdded(entry);
+			}
+		}
+	}
+	return error;
+}
+
+// EntryRemoved
+status_t
+Volume::EntryRemoved(vnode_id id, Entry *entry)
+{
+	status_t error = (entry ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = fDirectoryEntryTable->RemoveNodeChild(id, entry);
+		if (error == B_OK) {
+			// notify listeners
+			// listeners interested in that entry
+			EntryListenerTree::Iterator it;
+			if (fEntryListeners->FindFirst(entry, &it)) {
+				for (EntryListenerValue *value = it.GetCurrent();
+					 value && value->entry == entry;
+					 value = it.GetNext()) {
+					 if (value->flags & ENTRY_LISTEN_REMOVED)
+						 value->listener->EntryRemoved(entry);
+				}
+			}
+			// listeners interested in any entry
+			int32 count = fAnyEntryListeners.CountItems();
+			for (int32 i = 0; i < count; i++) {
+				const EntryListenerValue &value = fAnyEntryListeners.ItemAt(i);
+				 if (value.flags & ENTRY_LISTEN_REMOVED)
+					 value.listener->EntryRemoved(entry);
+			}
+		}
+	}
+	return error;
+}
+
+// FindEntry
+status_t
+Volume::FindEntry(vnode_id id, const char *name, Entry **entry)
+{
+	status_t error = (entry ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		*entry = fDirectoryEntryTable->GetNodeChild(id, name);
+		if (!*entry)
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// AddEntryListener
+status_t
+Volume::AddEntryListener(EntryListener *listener, Entry *entry, uint32 flags)
+{
+	// check parameters
+	if (!listener || !entry && !(flags & ENTRY_LISTEN_ANY_ENTRY)
+		|| !(flags & ENTRY_LISTEN_ALL)) {
+		return B_BAD_VALUE;
+	}
+	// add the listener to the right container
+	status_t error = B_OK;
+	EntryListenerValue value(listener, entry, flags);
+	if (flags & ENTRY_LISTEN_ANY_ENTRY) {
+		if (!fAnyEntryListeners.AddItem(value))
+			error = B_NO_MEMORY;
+	} else
+		error = fEntryListeners->Insert(value);
+	return error;
+}
+
+// RemoveEntryListener
+status_t
+Volume::RemoveEntryListener(EntryListener *listener, Entry *entry)
+{
+	if (!listener)
+		return B_BAD_VALUE;
+	status_t error = B_OK;
+	if (entry)
+		error = fEntryListeners->Remove(entry, listener);
+	else {
+		EntryListenerValue value(listener, entry, 0);
+		if (!fAnyEntryListeners.RemoveItem(value))
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// NodeAttributeAdded
+status_t
+Volume::NodeAttributeAdded(vnode_id id, Attribute *attribute)
+{
+	status_t error = (attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = fNodeAttributeTable->AddNodeChild(id, attribute);
+		// notify the respective attribute index
+		if (error == B_OK) {
+			if (AttributeIndex *index = FindAttributeIndex(
+					attribute->GetName(), attribute->GetType())) {
+				index->Added(attribute);
+			}
+		}
+	}
+	return error;
+}
+
+// NodeAttributeRemoved
+status_t
+Volume::NodeAttributeRemoved(vnode_id id, Attribute *attribute)
+{
+	status_t error = (attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = fNodeAttributeTable->RemoveNodeChild(id, attribute);
+		// notify the respective attribute index
+		if (error == B_OK) {
+			if (AttributeIndex *index = FindAttributeIndex(
+					attribute->GetName(), attribute->GetType())) {
+				index->Removed(attribute);
+			}
+		}
+
+		// update live queries
+		if (error == B_OK && attribute->GetNode()) {
+			const uint8* oldKey;
+			size_t oldLength;
+			attribute->GetKey(&oldKey, &oldLength);
+			UpdateLiveQueries(NULL, attribute->GetNode(), attribute->GetName(),
+				attribute->GetType(), oldKey, oldLength, NULL, 0);
+		}
+	}
+	return error;
+}
+
+// FindNodeAttribute
+status_t
+Volume::FindNodeAttribute(vnode_id id, const char *name, Attribute **attribute)
+{
+	status_t error = (attribute ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		*attribute = fNodeAttributeTable->GetNodeChild(id, name);
+		if (!*attribute)
+			error = B_ENTRY_NOT_FOUND;
+	}
+	return error;
+}
+
+// GetNameIndex
+NameIndex *
+Volume::GetNameIndex() const
+{
+	return (fIndexDirectory ? fIndexDirectory->GetNameIndex() : NULL);
+}
+
+// GetLastModifiedIndex
+LastModifiedIndex *
+Volume::GetLastModifiedIndex() const
+{
+	return (fIndexDirectory ? fIndexDirectory->GetLastModifiedIndex() : NULL);
+}
+
+// GetSizeIndex
+SizeIndex *
+Volume::GetSizeIndex() const
+{
+	return (fIndexDirectory ? fIndexDirectory->GetSizeIndex() : NULL);
+}
+
+// FindIndex
+Index *
+Volume::FindIndex(const char *name)
+{
+	return (fIndexDirectory ? fIndexDirectory->FindIndex(name) : NULL);
+}
+
+// FindAttributeIndex
+AttributeIndex *
+Volume::FindAttributeIndex(const char *name, uint32 type)
+{
+	return (fIndexDirectory
+			? fIndexDirectory->FindAttributeIndex(name, type) : NULL);
+}
+
+// AddQuery
+void
+Volume::AddQuery(Query *query)
+{
+	AutoLocker<Locker> _(fQueryLocker);
+
+	if (query)
+		fQueries.Insert(query);
+}
+
+// RemoveQuery
+void
+Volume::RemoveQuery(Query *query)
+{
+	AutoLocker<Locker> _(fQueryLocker);
+
+	if (query)
+		fQueries.Remove(query);
+}
+
+// UpdateLiveQueries
+void
+Volume::UpdateLiveQueries(Entry *entry, Node* node, const char *attribute,
+	int32 type, const uint8 *oldKey, size_t oldLength, const uint8 *newKey,
+	size_t newLength)
+{
+	AutoLocker<Locker> _(fQueryLocker);
+
+	for (Query* query = fQueries.GetFirst();
+		 query;
+		 query = fQueries.GetNext(query)) {
+		query->LiveUpdate(entry, node, attribute, type, oldKey, oldLength,
+			newKey, newLength);
+	}
+}
+
+// AllocateBlock
+status_t
+Volume::AllocateBlock(size_t size, BlockReference **block)
+{
+	status_t error = (size > 0 && size <= fBlockSize && block
+					  ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		*block = fBlockAllocator->AllocateBlock(size);
+		if (*block)
+			fAllocatedBlocks++;
+		else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	return error;
+}
+
+// FreeBlock
+void
+Volume::FreeBlock(BlockReference *block)
+{
+	if (block) {
+		fBlockAllocator->FreeBlock(block);
+		fAllocatedBlocks--;
+	}
+}
+
+// ResizeBlock
+BlockReference *
+Volume::ResizeBlock(BlockReference *block, size_t size)
+{
+	BlockReference *newBlock = NULL;
+	if (size <= fBlockSize && block) {
+		if (size == 0) {
+			fBlockAllocator->FreeBlock(block);
+			fAllocatedBlocks--;
+		} else
+			newBlock = fBlockAllocator->ResizeBlock(block, size);
+	}
+	return newBlock;
+}
+
+// CheckBlock
+bool
+Volume::CheckBlock(BlockReference *block, size_t size)
+{
+	return fBlockAllocator->CheckBlock(block, size);
+}
+
+// GetAllocationInfo
+void
+Volume::GetAllocationInfo(AllocationInfo &info)
+{
+	// tables
+	info.AddOtherAllocation(sizeof(NodeTable));
+	fNodeTable->GetAllocationInfo(info);
+	info.AddOtherAllocation(sizeof(DirectoryEntryTable));
+	fDirectoryEntryTable->GetAllocationInfo(info);
+	info.AddOtherAllocation(sizeof(NodeAttributeTable));
+	fNodeAttributeTable->GetAllocationInfo(info);
+	// node hierarchy
+	fRootDirectory->GetAllocationInfo(info);
+	// name
+	info.AddStringAllocation(fName.GetLength());
+	// block allocator
+	info.AddOtherAllocation(sizeof(BlockAllocator));
+	fBlockAllocator->GetAllocationInfo(info);
+}
+
+// ReadLock
+bool
+Volume::ReadLock()
+{
+	bool alreadyLocked = fLocker.IsLocked();
+	if (fLocker.Lock()) {
+		if (!alreadyLocked)
+			fAccessTime = system_time();
+		return true;
+	}
+	return false;
+}
+
+// ReadUnlock
+void
+Volume::ReadUnlock()
+{
+	fLocker.Unlock();
+}
+
+// WriteLock
+bool
+Volume::WriteLock()
+{
+	bool alreadyLocked = fLocker.IsLocked();
+	if (fLocker.Lock()) {
+		if (!alreadyLocked)
+			fAccessTime = system_time();
+		return true;
+	}
+	return false;
+}
+
+// WriteUnlock
+void
+Volume::WriteUnlock()
+{
+	fLocker.Unlock();
+}
+
+// IteratorLock
+bool
+Volume::IteratorLock()
+{
+	return fIteratorLocker.Lock();
+}
+
+// IteratorUnlock
+void
+Volume::IteratorUnlock()
+{
+	fIteratorLocker.Unlock();
+}
+

src/add-ons/kernel/file_systems/ramfs/Volume.h

@@ -0,0 +1,201 @@
+// Volume.h
+//
+// Copyright (c) 2003, Ingo Weinhold ([email protected])
+//
+// 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 Foundation; either version 2 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+// You can alternatively use *this file* under the terms of the the MIT
+// license included in this package.
+
+#ifndef VOLUME_H
+#define VOLUME_H
+
+#include <fsproto.h>
+#include <SupportDefs.h>
+
+#include "DLList.h"
+#include "Entry.h"
+#include "List.h"
+#include "Locker.h"
+#include "Query.h"
+#include "String.h"
+
+class AllocationInfo;
+class Block;
+class BlockAllocator;
+class BlockReference;
+class Directory;
+class DirectoryEntryTable;
+class Entry;
+class EntryListener;
+class EntryListenerTree;
+class Index;
+class IndexDirectory;
+class LastModifiedIndex;
+class NameIndex;
+class Node;
+class NodeAttributeTable;
+class NodeListener;
+class NodeListenerTree;
+class NodeTable;
+class SizeIndex;
+
+const vnode_id kRootParentID = 0;
+
+// NodeListenerValue
+class NodeListenerValue {
+public:
+	inline NodeListenerValue(int) {}
+	inline NodeListenerValue(NodeListener *listener, Node *node, uint32 flags)
+		: listener(listener), node(node), flags(flags) {}
+
+	inline bool operator==(const NodeListenerValue &other)
+		{ return listener == other.listener; }
+
+	NodeListener	*listener;
+	Node			*node;
+	uint32			flags;
+};
+typedef List<NodeListenerValue> NodeListenerList;
+
+// EntryListenerValue
+class EntryListenerValue {
+public:
+	inline EntryListenerValue(int) {}
+	inline EntryListenerValue(EntryListener *listener, Entry *entry,
+							  uint32 flags)
+		: listener(listener), entry(entry), flags(flags) {}
+
+	inline bool operator==(const EntryListenerValue &other)
+		{ return listener == other.listener; }
+
+	EntryListener	*listener;
+	Entry			*entry;
+	uint32			flags;
+};
+typedef List<EntryListenerValue> EntryListenerList;
+
+// Volume
+class Volume {
+public:
+	Volume();
+	~Volume();
+
+	status_t Mount(nspace_id nsid);
+	status_t Unmount();
+
+	nspace_id GetID() const { return fID; }
+
+	off_t GetBlockSize() const;
+	off_t CountBlocks() const;
+	off_t CountFreeBlocks() const;
+
+	status_t SetName(const char *name);
+	const char *GetName() const;
+
+	Directory *GetRootDirectory() const		{ return fRootDirectory; }
+
+	status_t NewVNode(Node *node);
+	status_t GetVNode(vnode_id id, Node **node);
+	status_t GetVNode(Node *node);
+	status_t PutVNode(vnode_id id);
+	status_t PutVNode(Node *node);
+	status_t RemoveVNode(Node *node);
+	status_t UnremoveVNode(Node *node);
+
+	// node table and listeners
+	status_t NodeAdded(Node *node);
+	status_t NodeRemoved(Node *node);
+	status_t FindNode(vnode_id id, Node **node);
+	status_t AddNodeListener(NodeListener *listener, Node *node,
+							 uint32 flags);
+	status_t RemoveNodeListener(NodeListener *listener, Node *node);
+
+	// entry table and listeners
+	status_t EntryAdded(vnode_id id, Entry *entry);
+	status_t EntryRemoved(vnode_id id, Entry *entry);
+	status_t FindEntry(vnode_id id, const char *name, Entry **entry);
+	status_t AddEntryListener(EntryListener *listener, Entry *entry,
+							  uint32 flags);
+	status_t RemoveEntryListener(EntryListener *listener, Entry *entry);
+
+	// node attribute table
+	status_t NodeAttributeAdded(vnode_id id, Attribute *attribute);
+	status_t NodeAttributeRemoved(vnode_id id, Attribute *attribute);
+	status_t FindNodeAttribute(vnode_id id, const char *name,
+							   Attribute **attribute);
+
+	// indices
+	IndexDirectory *GetIndexDirectory() const	{ return fIndexDirectory; }
+	NameIndex *GetNameIndex() const;
+	LastModifiedIndex *GetLastModifiedIndex() const;
+	SizeIndex *GetSizeIndex() const;
+	Index *FindIndex(const char *name);
+	AttributeIndex *FindAttributeIndex(const char *name, uint32 type);
+
+	// queries
+	void AddQuery(Query *query);
+	void RemoveQuery(Query *query);
+	void UpdateLiveQueries(Entry *entry, Node* node, const char *attribute,
+			int32 type, const uint8 *oldKey, size_t oldLength,
+			const uint8 *newKey, size_t newLength);
+
+	vnode_id NextNodeID() { return fNextNodeID++; }
+
+	status_t AllocateBlock(size_t size, BlockReference **block);
+	void FreeBlock(BlockReference *block);
+	BlockReference *ResizeBlock(BlockReference *block, size_t size);
+	// debugging only
+	bool CheckBlock(BlockReference *block, size_t size = 0);
+	void GetAllocationInfo(AllocationInfo &info);
+
+	bigtime_t GetAccessTime() const	{ return fAccessTime; }
+
+	// locking
+	bool ReadLock();
+	void ReadUnlock();
+	bool WriteLock();
+	void WriteUnlock();
+
+	bool IteratorLock();
+	void IteratorUnlock();
+
+private:
+	typedef DLList<Query>	QueryList;
+
+	nspace_id				fID;
+	vnode_id				fNextNodeID;
+	NodeTable				*fNodeTable;
+	DirectoryEntryTable		*fDirectoryEntryTable;
+	NodeAttributeTable		*fNodeAttributeTable;
+	IndexDirectory			*fIndexDirectory;
+	Directory				*fRootDirectory;
+	String					fName;
+	Locker					fLocker;
+	Locker					fIteratorLocker;
+	Locker					fQueryLocker;
+	NodeListenerTree		*fNodeListeners;
+	NodeListenerList		fAnyNodeListeners;
+	EntryListenerTree		*fEntryListeners;
+	EntryListenerList		fAnyEntryListeners;
+	QueryList				fQueries;
+	BlockAllocator			*fBlockAllocator;
+	off_t					fBlockSize;
+	off_t					fAllocatedBlocks;
+	bigtime_t				fAccessTime;
+	bool					fMounted;
+};
+
+#endif	// VOLUME_H

src/add-ons/kernel/file_systems/ramfs/cpp.cpp

@@ -0,0 +1,21 @@
+/* cpp - C++ in the kernel
+**
+** Initial version by Axel Dörfler, axeld@pinc-software.de
+** This file may be used under the terms of the OpenBeOS License.
+*/
+
+
+#include "cpp.h"
+
+
+//const struct nothrow_t nothrow = {};
+
+//extern "C" void __pure_virtual()
+//{
+	//printf("pure virtual function call");
+//}
+
+int stderr;
+
+extern "C" int fprintf() { return 0; }
+extern "C" void abort() {}

src/add-ons/kernel/file_systems/ramfs/cpp.h

@@ -0,0 +1,51 @@
+#ifndef CPP_H
+#define CPP_H
+/* cpp - C++ in the kernel
+**
+** Initial version by Axel Dörfler, axeld@pinc-software.de
+** This file may be used under the terms of the OpenBeOS License.
+*/
+
+#ifdef __cplusplus
+
+#include <new>
+#include <stdlib.h>
+
+
+// Oh no! C++ in the kernel! Are you nuts?
+//
+//	- no exceptions
+//	- (almost) no virtuals (well, the Query code now uses them)
+//	- it's basically only the C++ syntax, and type checking
+//	- since one tend to encapsulate everything in classes, it has a slightly
+//	  higher memory overhead
+//	- nicer code
+//	- easier to maintain
+
+
+inline void *operator new(size_t size, const nothrow_t&) throw()
+{
+	return malloc(size);
+} 
+
+inline void *operator new[](size_t size, const nothrow_t&) throw()
+{
+	return malloc(size);
+}
+ 
+inline void operator delete(void *ptr)
+{
+	free(ptr);
+} 
+
+inline void operator delete[](void *ptr)
+{
+	free(ptr);
+}
+
+// now we're using virtuals
+extern "C" void __pure_virtual();
+
+#endif	// __cplusplus
+
+#endif	/* CPP_H */

src/add-ons/kernel/file_systems/ramfs/makefile

@@ -0,0 +1,143 @@
+## BeOS Generic Makefile v2.2 ##
+
+## Fill in this file to specify the project being created, and the referenced
+## makefile-engine will do all of the hard work for you.  This handles both
+## Intel and PowerPC builds of the BeOS.
+
+## Application Specific Settings ---------------------------------------------
+
+# specify the name of the binary
+NAME= ../ramfs
+
+# specify the type of binary
+#	APP:	Application
+#	SHARED:	Shared library or add-on
+#	STATIC:	Static library archive
+#	DRIVER: Kernel Driver
+TYPE= DRIVER
+
+#	add support for new Pe and Eddie features
+#	to fill in generic makefile
+
+#%{
+# @src->@ 
+
+#	specify the source files to use
+#	full paths or paths relative to the makefile can be included
+# 	all files, regardless of directory, will have their object
+#	files created in the common object directory.
+#	Note that this means this makefile will not work correctly
+#	if two source files with the same name (source.c or source.cpp)
+#	are included from different directories.  Also note that spaces
+#	in folder names do not work well with this makefile.
+SRCS= AllocationInfo.cpp AreaUtils.cpp Attribute.cpp AttributeIndex.cpp \
+	  AttributeIndexImpl.cpp AttributeIterator.cpp \
+	  BlockAllocator.cpp BlockAllocatorArea.cpp BlockAllocatorAreaBucket.cpp \
+	  BlockReferenceManager.cpp DataContainer.cpp Debug.cpp \
+	  Directory.cpp Entry.cpp EntryIterator.cpp EntryListener.cpp File.cpp \
+	  Index.cpp IndexDirectory.cpp LastModifiedIndex.cpp Locker.cpp \
+	  NameIndex.cpp Node.cpp \
+	  NodeListener.cpp \
+	  NodeTable.cpp Query.cpp SizeIndex.cpp String.cpp SymLink.cpp Volume.cpp \
+	  cpp.cpp kernel_interface.cpp
+
+#	specify the resource files to use
+#	full path or a relative path to the resource file can be used.
+RSRCS= 
+
+# @<-src@ 
+#%}
+
+#	end support for Pe and Eddie
+
+#	specify additional libraries to link against
+#	there are two acceptable forms of library specifications
+#	-	if your library follows the naming pattern of:
+#		libXXX.so or libXXX.a you can simply specify XXX
+#		library: libbe.so entry: be
+#		
+#	- 	if your library does not follow the standard library
+#		naming scheme you need to specify the path to the library
+#		and it's name
+#		library: my_lib.a entry: my_lib.a or path/my_lib.a
+LIBS= /boot/develop/tools/gnupro/lib/gcc-lib/i586-beos/2.9-beos-000224/libgcc.a
+#	specify additional paths to directories following the standard
+#	libXXX.so or libXXX.a naming scheme.  You can specify full paths
+#	or paths relative to the makefile.  The paths included may not
+#	be recursive, so include all of the paths where libraries can
+#	be found.  Directories where source files are found are
+#	automatically included.
+LIBPATHS= 
+
+#	additional paths to look for system headers
+#	thes use the form: #include <header>
+#	source file directories are NOT auto-included here
+SYSTEM_INCLUDE_PATHS = 
+
+#	additional paths to look for local headers
+#	thes use the form: #include "header"
+#	source file directories are automatically included
+LOCAL_INCLUDE_PATHS = 
+
+#	specify the level of optimization that you desire
+#	NONE, SOME, FULL
+OPTIMIZE= NONE
+
+#	specify any preprocessor symbols to be defined.  The symbols will not
+#	have their values set automatically; you must supply the value (if any)
+#	to use.  For example, setting DEFINES to "DEBUG=1" will cause the
+#	compiler option "-DDEBUG=1" to be used.  Setting DEFINES to "DEBUG"
+#	would pass "-DDEBUG" on the compiler's command line.
+#
+# USER						- [0/1] userland build
+# DEBUG						- [0/1] Enable debugging.
+# DBG_PRINT					- [0/1] Print debug output to file (only if DEBUG).
+# DBG_PRINT_FILE			- [0/1] Name of debug output file
+#							  (only if DBG_PRINT).
+#
+DEFINES= USER=0 \
+		 DEBUG=1 \
+		 DEBUG_PRINT=1 \
+		 DEBUG_PRINT_FILE=\"/var/log/ramfs.log\" \
+		 B_BAD_DATA=B_ERROR
+
+#	specify special warning levels
+#	if unspecified default warnings will be used
+#	NONE = supress all warnings
+#	ALL = enable all warnings
+WARNINGS = ALL
+
+#	specify whether image symbols will be created
+#	so that stack crawls in the debugger are meaningful
+#	if TRUE symbols will be created
+SYMBOLS = TRUE
+
+#	specify debug settings
+#	if TRUE will allow application to be run from a source-level
+#	debugger.  Note that this will disable all optimzation.
+DEBUGGER = TRUE
+
+#	specify additional compiler flags for all files
+#COMPILER_FLAGS = -include "cpp.h" -fno-exceptions -fno-rtti \
+
+COMPILER_FLAGS = -include "cpp.h" -fno-exceptions \
+	-Wmissing-prototypes -Woverloaded-virtual \
+	-Wpointer-arith -Wcast-align -Wsign-compare
+
+#	specify additional linker flags
+LINKER_FLAGS =
+
+#	specify the version of this particular item
+#	(for example, -app 3 4 0 d 0 -short 340 -long "340 "`echo -n -e '\302\251'`"1999 GNU GPL") 
+#	This may also be specified in a resource.
+APP_VERSION = 
+
+#	(for TYPE == DRIVER only) Specify desired location of driver in the /dev
+#	hierarchy. Used by the driverinstall rule. E.g., DRIVER_PATH = video/usb will
+#	instruct the driverinstall rule to place a symlink to your driver's binary in
+#	~/add-ons/kernel/drivers/dev/video/usb, so that your driver will appear at
+#	/dev/video/usb when loaded. Default is "misc".
+DRIVER_PATH = 
+
+## include the makefile-engine
+include $(BUILDHOME)/etc/makefile-engine

src/add-ons/kernel/file_systems/ramfs/ramfs.h

@@ -0,0 +1,10 @@
+// ramfs.h
+
+#ifndef RAM_FS_H
+#define RAM_FS_H
+
+#include <SupportDefs.h>
+
+const size_t kMaxIndexKeyLength = 256;
+
+#endif	// RAM_FS_H

src/add-ons/kernel/file_systems/ramfs/ramfs_ioctl.h

@@ -0,0 +1,15 @@
+// ramfs_ioctl.h
+
+#ifndef RAMFS_IOCTL_H
+#define RAMFS_IOCTL_H
+
+#include <Drivers.h>
+
+#define RAMFS_IOCTL_BASE	(B_DEVICE_OP_CODES_END + 10001)
+
+enum {
+	RAMFS_IOCTL_GET_ALLOCATION_INFO		= RAMFS_IOCTL_BASE,	// AllocationInfo*
+	RAMFS_IOCTL_DUMP_INDEX,									// const char* name
+};
+
+#endif	// RAMFS_IOCTL_H