Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
This seems to lack support for QUEUE_FLAG_SG_GAPS to work around the retarded PPR format in the NVMe driver. I'm actually not sure we have a way to reproduce them for BLOCK_PC requests, but I think we should make sure to properly handle them. Maybe Keith or Jens have a good reproducer for these.