Reuse of Bluestore block devices

Hi all, We are working on RBD persistent writeback cache which caches data on block devices. Currently, we operate the cache device using the driver in BlueStore: src/os/bluestore/KernelDevice. Meanwhile, we may need to use other block device drivers in BlueStore. So we need to reuse these codes in librbd. Thanks to Jason who gave us some suggestions. And Changcheng submitted a PR about this work. https://github.com/ceph/ceph/pull/34622/ Welcome for more suggestions and comments. Best wishes Lisa -- Best wishes Lisa