* Implemented several new syscalls (_kern_find_{disk_device,partition}(),
{prepare,cancel}_disk_device_modifications(),
[un]register_file_device()),
* Fixed some details in existing syscalls.
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3976 a95241bf-73f2-0310-859d-f6bbb57e9c96