reserve_bytes
size_t reserve_bytes;
reserve_bytes = round_up(*len + block_offset, fs_info->sectorsize);
WARN_ON(reserve_bytes == 0);
ret = btrfs_delalloc_reserve_metadata(inode, reserve_bytes,
reserve_bytes, nowait);
return reserve_bytes;
ret = reserve_bytes(space_info, orig_bytes, flush);
ret = reserve_bytes(space_info, bytes, flush);