Hi Bob, In "GFS2: Implement iomap for block_map" you seem to have misunderstood the intention of the IOMAP_ZERO flag. It it set if iomap_begin is called for a zeroing operation, so that we don't allocate new blocks for holes or unwritten extents. It is not supposed to actually zero the blocks. Can you use some other way to communicate you internal zeroing request?
