From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: fsync() does not flush all the file
Date: Thu, 1 Sep 2011 17:50:10 -0400
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To: "Berthier, Emmanuel" <emmanuel.berthier@intel.com>
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On Thu, Sep 01, 2011 at 06:12:51PM +0000, Berthier, Emmanuel wrote:
> I've checked with traces that the issue is upper eMMC block driver.

What do you mean with this sentence?

Does your problem reproduce without eMMC in the game?  Does writing
directly to the block device and then fsync the data get it to disk?