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Add a best-effort stop command, UBLK_CMD_TRY_STOP_DEV, which only stops a ublk device when it has no active openers. Unlike UBLK_CMD_STOP_DEV, this command does not disrupt existing users. New opens are blocked only after disk_openers has reached zero; if the device is busy, the command returns -EBUSY and leaves it running. The ub->block_open flag is used only to close a race with an in-progress open and does not otherwise change open behavior. Advertise support via the UBLK_F_SAFE_STOP_DEV feature flag. Signed-off-by: Yoav Cohen <yoav@nvidia.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>