_FillMapEntry
status_t status = _FillMapEntry();
status_t _FillMapEntry();
_FillMapEntry(logicalBlock);
_FillMapEntry(totalExtents - 1);
status = _FillMapEntry(0);
status_t _FillMapEntry(xfs_extnum_t num);
status = _FillMapEntry();
status_t _FillMapEntry();