Method write_header

server/src/server/disk_prefix_cache.cpp:790–804

    // does NOT own the backend, so we cannot free it here. Since snapshot_free
    // only frees buf + ctx, we accept a small leak of the lightweight cpu
    // backend object (~64 bytes per load). For a bounded disk cache this is
    // negligible. A proper fix would store cpu alongside the snapshot.

    return true;
}

// ─── Header I/O ─────────────────────────────────────────────────────────

bool DiskPrefixCache::write_header(FILE * f, const DiskCacheHeader & hdr) {
    std::fwrite(hdr.magic, 1, 4, f);
    write_u32(f, hdr.version);
    std::fwrite(hdr.layout_id, 1, 16, f);
    write_u32(f, hdr.cur_pos);
    write_u32(f, hdr.n_tensors);
    write_u32(f, hdr.token_count);
    std::fwrite(hdr.token_hash, 1, 16, f);
    write_u64(f, hdr.payload_bytes);
    write_u64(f, hdr.created_at);