On 17 November 2017 at 20:47, Michael Lyle [off-list ref] wrote:

A new field was introduced in 74d46992e0d9dee7f1f376de0d56d31614c8a17a,
bi_partno, instead of using bdev->bd_contains and encoding the partition
information in the bi_bdev field.  __bio_clone_fast was changed to copy
the disk information, but not the partition information.  At minimum,
this regressed bcache and caused data corruption.

Thanks alot for this Michael, I will run it up on our test servers today.

Campbell