bch_extent_to_text
bch_extent_to_text(kbuf, sizeof(kbuf), &w->key);
bch_extent_to_text(buf, sizeof(buf), k);
bch_extent_to_text(buf, sizeof(buf), k);
bch_extent_to_text(buf, sizeof(buf), k);
.key_to_text = bch_extent_to_text,
bch_extent_to_text(buf, sizeof(buf), k);
bch_extent_to_text(buf, sizeof(buf), k);
bch_extent_to_text(buf, sizeof(buf), k);
.key_to_text = bch_extent_to_text,
void bch_extent_to_text(char *buf, size_t size, const struct bkey *k);
bch_extent_to_text(buf, sizeof(buf), k);