FUSE_URING_IOV_SEGS
struct iovec iov[FUSE_URING_IOV_SEGS])
if (sqe->len != FUSE_URING_IOV_SEGS)
ret = import_iovec(WRITE, uiov, FUSE_URING_IOV_SEGS,
FUSE_URING_IOV_SEGS, &iov, &iter);
struct iovec iov[FUSE_URING_IOV_SEGS];