sr_meta_native_read
if (sr_meta_native_read(fake_sd, rawdev, md, NULL)) {
if (sr_meta_native_read(sd, ch_entry->src_dev_mm, md, NULL)) {
if (sr_meta_native_read(sd, ch_entry->src_dev_mm, md,
sr_meta_native_read, sr_meta_native_write, NULL },
if (sr_meta_native_read(sd, dev, sm, NULL)) {
int sr_meta_native_read(struct sr_discipline *, dev_t,