linux-kernel - how to check how much data left to sync to disk at umount?

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Message-ID: <CAAJw_ZvgSrKFG4cWL++jLROoNm7R=w7s8m6u2D2KMiXJtqg2=Q@mail.gmail.com>
Date:	Mon, 7 Sep 2015 13:29:33 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>
Subject: how to check how much data left to sync to disk at umount?

When umount a slow device such as an SD card, the command will take a
while to run depending on how much data is left to write to the
device. Is there way to check how much data is remaining waiting to
write to the device?

Thanks,
Jeff.
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