From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Tue, 28 Jun 2011 11:22:48 +0000 (+0200)
Subject: drbd: we should write meta data updates with FLUSH FUA
X-Git-Tag: v3.0-rc7~36^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86e1e98e5c6b4edab97e2b058466ef553cfd878e;p=pandora-kernel.git

drbd: we should write meta data updates with FLUSH FUA

We used to write these with BIO_RW_BARRIER aka REQ_HARDBARRIER (unless
disabled in the configuration). The correct semantic now would be to
write with FLUSH/FUA.
For example, with activity log transactions, FUA alone is not enough, we
need the corresponding bitmap update (and all related application
updates) on stable storage as well.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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