md/r5cache: generate R5LOG_PAYLOAD_FLUSH
In r5c_finish_stripe_write_out(), R5LOG_PAYLOAD_FLUSH is append to log->current_io. Appending R5LOG_PAYLOAD_FLUSH in quiesce needs extra writes to journal. To simplify the logic, we just skip R5LOG_PAYLOAD_FLUSH in quiesce. Even R5LOG_PAYLOAD_FLUSH supports multiple stripes per payload. However, current implementation is one stripe per R5LOG_PAYLOAD_FLUSH, which is simpler. Signed-off-by: NSong Liu <songliubraving@fb.com> Signed-off-by: NShaohua Li <shli@fb.com>
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