kernel-4.15.patch

   1 diff -ur lin_tape-3.0.23/upper.c lin_tape-3.0.23.iov/upper.c
   2 --- lin_tape-3.0.23/upper.c     2018-04-07 22:18:09.417415364 +0200
   3 +++ lin_tape-3.0.23.iov/upper.c 2018-04-07 22:19:26.582769230 +0200
   4 @@ -388,6 +388,22 @@
   5         if (hdr->iovec_count) {
   6                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
   7                 size_t iov_data_len;
   8 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0)
   9 +               struct iov_iter i;
  10 +
  11 +               sg_iov = kmalloc(size, GFP_KERNEL);
  12 +               if (!sg_iov) {
  13 +                       ret = -ENOMEM;
  14 +                       goto out;
  15 +               }
  16 +
  17 +               ret = import_iovec(hdr->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ, hdr->dxferp, hdr->iovec_count, 0, (struct iovec **)&sg_iov, &i);
  18 +               if (ret < 0)
  19 +                       goto out;
  20 +
  21 +               iov_iter_truncate(&i, hdr->dxfer_len);
  22 +               iov_data_len = hdr->dxfer_len;
  23 +#else
  24                 struct iovec *iov;
  25                 int i;
  26
  27 @@ -426,6 +442,7 @@
  28                                                         hdr->dxfer_len);
  29                         iov_data_len = hdr->dxfer_len;
  30                 }
  31 +#endif
  32
  33                 pfo_cmd.buffer = sg_iov;
  34                 pfo_cmd.bufflen = iov_data_len;