fuse_in_size
return fuse_in_size(fip) - sizeof(struct fuse_in_header);
if (uio->uio_resid < fuse_in_size(fip))
error = uiomove(fuse_in(fip), fuse_in_size(fip), uio);
fuse_fill_in_header(fuse_in(fip), fuse_in_size(fip), op, fip->unique,