I will try to look into this issue of device cache flush. Do you have a tracker link for the bug?
How I wish this were a forum! But here is a link: http://www.spinics.net/lists/ceph-users/msg05966.html
And this: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=39c60a0948cc06139e2fbfe084f83cb7e7deae3b
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