HAMMER_ITOB
hammer_rel_buffer(HAMMER_ITOB(io), 0);
hammer_rel_buffer(HAMMER_ITOB(io), 0);
hammer_rel_buffer(HAMMER_ITOB(io), 0);
hammer_buffer_t buffer = HAMMER_ITOB(io);
switch(HAMMER_ZONE(HAMMER_ITOB(io)->zoneX_offset)) {
switch(HAMMER_ZONE(HAMMER_ITOB(io)->zoneX_offset)) {
HAMMER_ITOB(io)->ondisk = NULL;
hammer_rel_buffer(HAMMER_ITOB(io), 0);
if (HAMMER_ITOB(io)->zoneX_offset == next_offset)