bytes_to_csum_size
return sizeof(struct btrfs_ordered_sum) + bytes_to_csum_size(fs_info, bytes);
if (bytes_to_csum_size(fs_info, start - key.offset) <
offset = bytes_to_csum_size(fs_info, start - key.offset);
bytes_to_csum_size(fs_info, size));
if (bytes_to_csum_size(fs_info, start - key.offset) <
u8 *csum_dest = csum_buf + bytes_to_csum_size(fs_info,
offset = bytes_to_csum_size(fs_info, start - key.offset);
bytes_to_csum_size(fs_info, size));