* When run as part of the boot loader, it will now adjust the size of partitions

to fit into the session - this should help bug #238 to disappear.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18988 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/partitioning_systems/intel/PartitionMap.cpp

@@ -84,9 +84,9 @@ static const struct partition_type kPartitionTypes[] = {
 	{ 0, NULL }
 };
 
+
 // partition_type_string
-static
-const char *
+static const char *
 partition_type_string(uint8 type)
 {
 	int32 i;
@@ -111,7 +111,58 @@ get_partition_type_string(uint8 type, char *buffer)
 }
 
 
-// Partition
+static int
+cmp_partition_offset(const void *p1, const void *p2)
+{
+	const Partition *partition1 = *(const Partition**)p1;
+	const Partition *partition2 = *(const Partition**)p2;
+	if (partition1->Offset() < partition2->Offset())
+		return -1;
+	else if (partition1->Offset() > partition2->Offset())
+		return 1;
+	return 0;
+}
+
+
+static int
+cmp_offset(const void *o1, const void *o2)
+{
+	off_t offset1 = *static_cast<const off_t*>(o1);
+	off_t offset2 = *static_cast<const off_t*>(o2);
+	if (offset1 < offset2)
+		return -1;
+	else if (offset1 > offset2)
+		return 1;
+	return 0;
+}
+
+
+static bool
+is_inside_partitions(off_t location, const Partition **partitions, int32 count)
+{
+	bool result = false;
+	if (count > 0) {
+		// binary search
+		int32 lower = 0;
+		int32 upper = count - 1;
+		while (lower < upper) {
+			int32 mid = (lower + upper) / 2;
+			const Partition *midPartition = partitions[mid];
+			if (location >= midPartition->Offset() + midPartition->Size())
+				lower = mid + 1;
+			else
+				upper = mid;
+		}
+		const Partition *partition = partitions[lower];
+		result = (location >= partition->Offset() &&
+				  location < partition->Offset() + partition->Size());
+	}
+	return result;
+}
+
+
+//	#pragma mark - Partition
+
 
 // constructor
 Partition::Partition()
@@ -161,21 +212,35 @@ Partition::Unset()
 	fActive = false;
 }
 
-// CheckLocation
+
+#ifdef _BOOT_MODE
+void
+Partition::AdjustSize(off_t sessionSize)
+{
+	// To work around buggy (or older) BIOS, we shrink the partition size to
+	// always fit into its session - this should improve detection of boot
+	// partitions (see bug #238 for more information)
+	if (sessionSize > fOffset + fSize)
+		fSize = sessionSize - fOffset;
+}
+#endif
+
+
 bool
 Partition::CheckLocation(off_t sessionSize, int32 blockSize) const
 {
 	// offsets and size must be block aligned, PTS and partition must lie
 	// within the session
-	return (fPTSOffset % blockSize == 0
+	return fPTSOffset % blockSize == 0
 		&& fOffset % blockSize == 0
 		&& fSize % blockSize == 0
 		&& fPTSOffset >= 0 && fPTSOffset < sessionSize
-			&& fOffset >= 0 && fOffset + fSize <= sessionSize);
+		&& fOffset >= 0 && fOffset + fSize <= sessionSize;
 }
 
 
-// PrimaryPartition
+//	#pragma mark - PrimaryPartition
+
 
 // constructor
 PrimaryPartition::PrimaryPartition()
@@ -249,7 +314,8 @@ PrimaryPartition::AddLogicalPartition(LogicalPartition *partition)
 }
 
 
-// LogicalPartition
+//	#pragma mark - LogicalPartition
+
 
 // constructor
 LogicalPartition::LogicalPartition()
@@ -295,7 +361,8 @@ LogicalPartition::Unset()
 }
 
 
-// PartitionMap
+//	#pragma mark - PartitionMap
+
 
 // constructor
 PartitionMap::PartitionMap()
@@ -387,59 +454,6 @@ PartitionMap::PartitionAt(int32 index) const
 	return const_cast<PartitionMap*>(this)->PartitionAt(index);
 }
 
-// cmp_partition_offset
-static
-int
-cmp_partition_offset(const void *p1, const void *p2)
-{
-	const Partition *partition1 = *(const Partition**)p1;
-	const Partition *partition2 = *(const Partition**)p2;
-	if (partition1->Offset() < partition2->Offset())
-		return -1;
-	else if (partition1->Offset() > partition2->Offset())
-		return 1;
-	return 0;
-}
-
-// cmp_offset
-static
-int
-cmp_offset(const void *o1, const void *o2)
-{
-	off_t offset1 = *static_cast<const off_t*>(o1);
-	off_t offset2 = *static_cast<const off_t*>(o2);
-	if (offset1 < offset2)
-		return -1;
-	else if (offset1 > offset2)
-		return 1;
-	return 0;
-}
-
-// is_inside_partitions
-static
-bool
-is_inside_partitions(off_t location, const Partition **partitions, int32 count)
-{
-	bool result = false;
-	if (count > 0) {
-		// binary search
-		int32 lower = 0;
-		int32 upper = count - 1;
-		while (lower < upper) {
-			int32 mid = (lower + upper) / 2;
-			const Partition *midPartition = partitions[mid];
-			if (location >= midPartition->Offset() + midPartition->Size())
-				lower = mid + 1;
-			else
-				upper = mid;
-		}
-		const Partition *partition = partitions[lower];
-		result = (location >= partition->Offset() &&
-				  location < partition->Offset() + partition->Size());
-	}
-	return result;
-}
-
 // Check
 bool
 PartitionMap::Check(off_t sessionSize, int32 blockSize) const

src/add-ons/kernel/partitioning_systems/intel/PartitionMap.h

@@ -1,7 +1,11 @@
-//----------------------------------------------------------------------
-//  This software is part of the OpenBeOS distribution and is covered 
-//  by the OpenBeOS license.
-//---------------------------------------------------------------------
+/*
+ * Copyright 2003-2006, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Ingo Weinhold, bonefish@cs.tu-berlin.de
+ */
+
 /*!
 	\file PartitionMap.h
 	\brief Definitions for "intel" style partitions and interface definitions
@@ -104,6 +108,9 @@ public:
 	void SetActive(bool active)		{ fActive = active; }
 
 	bool CheckLocation(off_t sessionSize, int32 blockSize) const;
+#ifdef _BOOT_MODE
+	void AdjustSize(off_t sessionSize);
+#endif
 
 private:
 	off_t	fPTSOffset;

src/add-ons/kernel/partitioning_systems/intel/PartitionMapParser.cpp

@@ -88,18 +88,25 @@ PartitionMapParser::Parse(const uint8 *block, PartitionMap *map)
 status_t
 PartitionMapParser::_ParsePrimary(const partition_table_sector *pts)
 {
-	status_t error = (pts ? B_OK : B_BAD_VALUE);
+	if (pts == NULL)
+		return B_BAD_VALUE;
+
 	// check the signature
-	if (error == B_OK && pts->signature != kPartitionTableSectorSignature) {
+	if (pts->signature != kPartitionTableSectorSignature) {
 		TRACE(("intel: _ParsePrimary(): invalid PTS signature\n"));
-		error = B_BAD_DATA;
+		return B_BAD_DATA;
 	}
+
 	// examine the table
-	if (error == B_OK) {
 	for (int32 i = 0; i < 4; i++) {
 		const partition_descriptor *descriptor = &pts->table[i];
 		PrimaryPartition *partition = fMap->PrimaryPartitionAt(i);
 		partition->SetTo(descriptor, 0, fBlockSize);
+
+#ifdef _BOOT_MODE
+		// work-around potential BIOS problems
+		partition->AdjustSize(fSessionSize);
+#endif
 		// ignore, if location is bad
 		if (!partition->CheckLocation(fSessionSize, fBlockSize)) {
 			TRACE(("intel: _ParsePrimary(): partition %ld: bad location, "
@@ -107,26 +114,24 @@ PartitionMapParser::_ParsePrimary(const partition_table_sector *pts)
 			partition->Unset();
 		}
 	}
-	}
+
 	// allocate a PTS buffer
-	if (error == B_OK) {
 	fPTS = new(nothrow) partition_table_sector;
-		if (!fPTS)
-			error = B_NO_MEMORY;
-	}
+	if (fPTS == NULL)
+		return B_NO_MEMORY;
+
 	// parse extended partitions
-	if (error == B_OK) {
+	status_t error = B_OK;
 	for (int32 i = 0; error == B_OK && i < 4; i++) {
 		PrimaryPartition *primary = fMap->PrimaryPartitionAt(i);
 		if (primary->IsExtended())
 			error = _ParseExtended(primary, primary->Offset());
 	}
-	}
+
 	// cleanup
-	if (fPTS) {
 	delete fPTS;
 	fPTS = NULL;
-	}
+
 	return error;
 }
 
@@ -193,6 +198,11 @@ PartitionMapParser::_ParseExtended(PrimaryPartition *primary, off_t offset)
 								   "non-extended partition allowed\n"));
 						}
 					}
+#ifdef _BOOT_MODE
+					// work-around potential BIOS problems
+					if (partition)
+						partition->AdjustSize(fSessionSize);
+#endif
 					// check the partition's location
 					if (partition && !partition->CheckLocation(fSessionSize,
 															   fBlockSize)) {

src/add-ons/kernel/partitioning_systems/intel/PartitionMapParser.h

@@ -1,10 +1,17 @@
-// PartitionMapParser.h
-
+/*
+ * Copyright 2003-2006, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Ingo Weinhold, bonefish@cs.tu-berlin.de
+ */
 #ifndef PARTITION_MAP_PARSER_H
 #define PARTITION_MAP_PARSER_H
 
+
 #include <SupportDefs.h>
 
+
 class Partition;
 class PartitionMap;
 class PrimaryPartition;
@@ -32,7 +39,7 @@ private:
 		off_t					fSessionSize;
 		int32					fBlockSize;
 		partition_table_sector	*fPTS;	// while parsing
-	PartitionMap			*fMap;	//
+		PartitionMap			*fMap;
 };
 
 #endif	// PARTITION_MAP_PARSER_H