- Kill the bogus ret transformation in block/ioctl.c if we return
  -EINVAL, doesn't make any sense.

- Don't allow sg_reserved_size to be set bigger than a request we can
  deal with...

- timeout fixes.

- Cleanup of user access.

- Set SAM_STAT_CHECK_CONDITION, not CHECK_CONDITION which needs to be
  bit shifted 1 up.

- Set sense_len correctly.

- Account sense_len correctly, don't just increment by 1...

- Use the correct pointer in post transform.

- Fix oops in bio_map_user(), it must get the extra reference prior to
  calling bio_unmap_user() itself too.