dm_target_rem
int dm_target_rem(const char *);
r = dm_target_rem("delay");
r = dm_target_rem("error");
r = dm_target_rem("flakey");
r = dm_target_rem("mirror");
if ((r = dm_target_rem("snapshot")) == 0)
r = dm_target_rem("snapshot-origin");
r = dm_target_rem("striped");
r = dm_target_rem("zero");