offset_in_extent 4736 fs/btrfs/extent_io.c u64 offset_in_extent = 0; offset_in_extent 4757 fs/btrfs/extent_io.c offset_in_extent = em_start - em->start; offset_in_extent 4762 fs/btrfs/extent_io.c disko = em->block_start + offset_in_extent;