From mboxrd@z Thu Jan  1 00:00:00 1970
From: wangyijing <wangyijing@huawei.com>
Subject: question about writeback data
Date: Fri, 21 Apr 2017 10:49:51 +0800
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Hi all, recently I read bcache writeback related codes, and found there is no flush send
during writeback flow, after a bio complete, write_dirty_finish() be called, and free the
meta key in cache devices, if a sudden poweroff happen, the data cached in backing device cache may lost, right?

Thanks!
Yijing.