The LFSCK should be able to validate EC layout constraints:
parity layout ↔ data layout bidirectional link, matching extent and stripe_size,
geometry (dstripe/cstripe non-zero, k+p ≤ 256, self-consistent ec_split_stripes, parity stripe_count = (n0+n1) * cstripe ≤ data stripes),
parity mirror must not mix non-parity components and must start at the mirror boundary. etc