K 10 svn:author V 3 kib K 8 svn:date V 27 2012-05-30T16:06:38.503344Z K 7 svn:log V 317 Add a rangelock implementation, intended to be used to range-locking the i/o regions of the vnode data space. The implementation is quite simple-minded, it uses the list of the lock requests, ordered by arrival time. Each request may be for read or for write. The implementation is fair FIFO. MFC after: 2 month END