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(class fhandler_dev_floppy): Convert partitions to part_t pointer. Add lock_partition method. * fhandler_floppy.cc (fhandler_dev_floppy::lock_partition): New method to implement ondemand partition locking. (fhandler_dev_floppy::write_file): Call lock_partition from here if writing failed due to a potential write restriction on a disk partition. (fhandler_dev_floppy::open): Don't lock partitions here. (fhandler_dev_floppy::close): Keep track of partition handle reference count. Close handles and remove partitions pointer ony if count is 0. (fhandler_dev_floppy::dup): Just copy partitions pointer and increment reference count.
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