mds: flush the mdlog for async creating immediately

[lxbsz]

The kclient maybe waiting for the async creating to be finished, such as when revoking caps. This will make the kclient defer sending the cap update request to MDS back.

We should flush the mdlog immediately.

https://tracker.ceph.com/issues/46904 Signed-off-by: Xiubo Li [email protected]

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[lxbsz]

This seems incorrect. I will check it further tomorrow.