Added a find_disk_system(). I first thought, this might be a good idea, but I'm not so sure anymore.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3608 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/disk_device_manager/disk_device_manager.h

@@ -84,6 +84,9 @@ bool delete_partition(partition_id partitionID);
 void partition_modified(partition_id partitionID);
 	// tells the disk device manager, that the parition has been modified
 
+// disk systems
+disk_system_id find_disk_system(const char *name);
+
 // jobs
 bool set_disk_device_job_status(disk_job_id job, uint32 status);
 	// probably not needed

src/kernel/core/disk_device_manager/disk_device_manager.cpp

@@ -5,6 +5,8 @@
 #include "disk_device_manager.h"
 #include "KDiskDevice.h"
 #include "KDiskDeviceManager.h"
+#include "KDiskDeviceUtils.h"
+#include "KDiskSystem.h"
 #include "KPartition.h"
 
 // debugging
@@ -162,3 +164,15 @@ partition_modified(partition_id partitionID)
 	// not implemented
 }
 
+// find_disk_system
+disk_system_id
+find_disk_system(const char *name)
+{
+	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
+	if (ManagerLocker locker = manager) {
+		if (KDiskSystem *diskSystem = manager->DiskSystemWithName(name))
+			return diskSystem->ID();
+	}
+	return -1;
+}
+