since 4.2 this can be used to ensure that `rbd device unmap` eventually
times out when there is no network connection to a cluster.
-* lock_timeout=x - A timeout on waiting for the acquisition of exclusive lock
- (since 4.17, default is 0 seconds, meaning no timeout).
-
* osdkeepalive=x - OSD keepalive timeout (default is 5 seconds).
* osd_idle_ttl=x - OSD idle TTL (default is 60 seconds).
* exclusive - Disable automatic exclusive lock transitions (since 4.12).
+* lock_timeout=x - A timeout on waiting for the acquisition of exclusive lock
+ (since 4.17, default is 0 seconds, meaning no timeout).
+
* notrim - Turn off discard and write zeroes offload support to avoid
deprovisioning a fully provisioned image (since 4.17). When enabled, discard
requests will fail with -EOPNOTSUPP, write zeroes requests will fall back to