On 28.01.2013 11:32, Sebastian Riemer wrote:

O.K., then I hope Neil applies the attached patch. I've changed the
return value to success.

This is also something for linux-stable and should apply to many kernel
versions without an issue.

I've tried to race with continuous fsyncs against continuous "mdadm -o
/dev/md0; mdadm -w /dev/md0;" in parallel but couldn't break it.
Therefore, no additional locking is required and this part can be put
directly before the RCU locking stuff and the suspended handling.

I've attached version 3 of the patch.