block: Add flush callback
Some block devices need an explicit callback for flushing written
blocks. Add this callback.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent 2e82822 commit 2d9d230089d0a5088bb3b37b01dfddc6527740a6
@Sascha Hauer Sascha Hauer authored on 4 Jul 2014
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common/block.c
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include/block.h