btrfs_bin_search
return btrfs_bin_search(eb, search_low_slot, key, slot);
ret = btrfs_bin_search(b, 0, key, &slot);
sret = btrfs_bin_search(cur, 0, min_key, &slot);
int btrfs_bin_search(const struct extent_buffer *eb, int first_slot,
ret = btrfs_bin_search(parent, 0, &key, &slot);
ret = btrfs_bin_search(upper->eb, 0, key, &slot);
ret = btrfs_bin_search(upper->eb, 0, key, &slot);
ret = btrfs_bin_search(path->nodes[0], 0, &found_key, &start_slot);