* Added a very simple way to fragment your disk.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33674 a95241bf-73f2-0310-859d-f6bbb57e9c96

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

@@ -1062,6 +1062,37 @@ BlockAllocator::BitmapSize() const
 }
 
 
+#ifdef DEBUG_FRAGMENTER
+void
+BlockAllocator::Fragment()
+{
+	AllocationBlock cached(fVolume);
+	MutexLocker lock(fLock);
+
+	// only leave 4 block holes
+	static const uint32 kMask = 0x0f0f0f0f;
+	uint32 valuesPerBlock = fVolume->BlockSize() / 4;
+
+	for (int32 i = 0; i < fNumGroups; i++) {
+		AllocationGroup& group = fGroups[i];
+
+		for (uint32 block = 0; block < group.NumBlocks(); block++) {
+			Transaction transaction(fVolume, 0);
+
+			if (cached.SetToWritable(transaction, group, block) != B_OK)
+				return;
+
+			for (int32 index = 0; index < valuesPerBlock; index++) {
+				cached.Block(index) |= HOST_ENDIAN_TO_BFS_INT32(kMask);
+			}
+
+			transaction.Done();
+		}
+	}
+}
+#endif	// DEBUG_FRAGMENTER
+
+
 #ifdef DEBUG_ALLOCATION_GROUPS
 void
 BlockAllocator::_CheckGroup(int32 groupIndex) const

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

@@ -21,6 +21,7 @@ struct check_cookie;
 
 
 //#define DEBUG_ALLOCATION_GROUPS
+//#define DEBUG_FRAGMENTER
 
 
 class BlockAllocator {
@@ -63,6 +64,9 @@ public:
 #ifdef BFS_DEBUGGER_COMMANDS
 			void			Dump(int32 index);
 #endif
+#ifdef DEBUG_FRAGMENTER
+			void			Fragment();
+#endif
 
 private:
 			status_t		_RemoveInvalidNode(Inode* parent, BPlusTree* tree,

src/add-ons/kernel/file_systems/bfs/kernel_interface.cpp

@@ -682,6 +682,16 @@ bfs_ioctl(fs_volume* _volume, fs_vnode* _node, void* _cookie, ulong cmd,
 
 			return volume->WriteSuperBlock();
 		}
+
+#ifdef DEBUG_FRAGMENTER
+		case 56741:
+		{
+			BlockAllocator& allocator = volume->Allocator();
+			allocator.Fragment();
+			return B_OK;
+		}
+#endif
+
 #ifdef DEBUG
 		case 56742:
 		{