Alexander Motin 13ea8106d9 Use new optimized dmu_read_uio_dbuf() for ZVOLs in device mode.
This slightly reduces overhead by avoiding dnode_hold()/dnode_rele() calls.

MFC after:	2 weeks
2015-01-10 18:28:58 +00:00
..
2014-11-10 08:20:21 +00:00