4082 zfs receive gets EFBIG from dmu_tx_hold_free()
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>

*** 671,680 ****
--- 671,690 ----
  
          err = dnode_hold(os, object, FTAG, &dn);
          if (err != 0)
                  return (err);
          err = dmu_free_long_range_impl(os, dn, offset, length);
+ 
+         /*
+          * It is important to zero out the maxblkid when freeing the entire
+          * file, so that (a) subsequent calls to dmu_free_long_range_impl()
+          * will take the fast path, and (b) dnode_reallocate() can verify
+          * that the entire file has been freed.
+          */
+         if (offset == 0 && length == DMU_OBJECT_END)
+                 dn->dn_maxblkid = 0;
+ 
          dnode_rele(dn, FTAG);
          return (err);
  }
  
  int