XFS_IEXT_STARTOFF_MASK
uint64_t rec_offset = rec->lo & XFS_IEXT_STARTOFF_MASK;
return leaf->recs[n].lo & XFS_IEXT_STARTOFF_MASK;
ASSERT((irec->br_startoff & ~XFS_IEXT_STARTOFF_MASK) == 0);
rec->lo = irec->br_startoff & XFS_IEXT_STARTOFF_MASK;
irec->br_startoff = rec->lo & XFS_IEXT_STARTOFF_MASK;