From: Richard Weinberger <richard@nod.at>
Date: Sun, 18 Aug 2013 11:30:06 +0000 (+0200)
Subject: um: ubd: Add REQ_FLUSH suppport
X-Git-Tag: v3.12-rc1~94^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=805f11a0d515658106bfbfadceff0eb30bd90ad2;p=pandora-kernel.git

um: ubd: Add REQ_FLUSH suppport

UML's block device driver does not support write barriers,
to support this this patch adds REQ_FLUSH suppport.
Every time the block layer sends a REQ_FLUSH we fsync() now
our backing file to guarantee data consistency.

Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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