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4d6350b3b0
We were seeing ABBA deadlocks on the dio_count wait and extent_sem between fallocate and reads. It turns out that fallocate got lock ordering wrong. This brings fallocate in line with the rest of the adherents to the lock heirarchy. Most importantly, the extent_sem is used after the dio_count. While we're at it we bring the i_mutex down to just before the cluster lock for consistency. Signed-off-by: Zach Brown <zab@versity.com>