From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Wed, 1 Sep 2010 13:12:12 +0000 (+0200)
Subject: drbd: fix race on meta-data update
X-Git-Tag: v2.6.37-rc1~167^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f3a9b849d2b703934c07fa17f5eac2dc37c1f6b;p=pandora-kernel.git

drbd: fix race on meta-data update

The race:
	drbd_md_mark_dirty()
	drbd_md_sync()
		if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
			return;
		drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)
  ==> RACE
		clear_bit(MD_DIRTY, &mdev->flags); <== spurious

Fixed by removing the spurious clear_bit.

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

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