Xin LI 8c20e2ff11 MFV r272494:
Make space_map_truncate() always do space_map_reallocate().  Without
this, setting space_map_max_blksz would cause panic for existing pool,
as dmu_objset_set_blocksize would fail if the object have multiple blocks.

Illumos issues:
   5164 space_map_max_blksz causes panic, does not work
   5165 zdb fails assertion when run on pool with recently-enabled
	spacemap_histogram feature

MFC after:	2 weeks
2014-10-04 08:05:39 +00:00
..
2014-10-04 08:05:39 +00:00