LINFO
LINFO(curlun, "unable to open backing file: %s\n", filename);
LINFO(curlun, "invalid file type: %s\n", filename);
LINFO(curlun, "file not readable: %s\n", filename);
LINFO(curlun, "unable to find file size: %s\n", filename);
LINFO(curlun, "file too big: %s\n", filename);
LINFO(curlun, "using only first %d blocks\n",
LINFO(curlun, "file too small: %s\n", filename);