OPERATION_ACQUIRE, /* enqueued on AcquireHome() */
OPERATION_RELEASE, /* enqueued on ReleaseHome() */
OPERATION_LOCK_ALL, /* enqueued on LockAllHomes() */
+ OPERATION_DEACTIVATE_ALL, /* enqueued on DeactivateAllHomes() */
OPERATION_PIPE_EOF, /* enqueued when we see EOF on the per-home reference pipes */
OPERATION_DEACTIVATE_FORCE, /* enqueued on hard $HOME unplug */
OPERATION_IMMEDIATE, /* this is never enqueued, it's just a marker we immediately started executing an operation without enqueuing anything first. */