xfs_alloc_put_freelist marks the blocks it gets as "busy".  However, this
function is used in two different ways:
   
  1.  xfs_alloc_fix_freelist calls xfs_alloc_put_freelist to add new
  blocks to the freelist (that is, blocks it allocated with
  xfs_alloc_ag_vextent).
   
  2.  xfs_alloc_delrec calls xfs_alloc_put_freelist to free deleted
  b+tree blocks.  
   
In case 1, the blocks should not be on the busy list; in case 2, they
should.

Modid: 2.5.x-xfs:slinx:129987a