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由 Josef Bacik 提交于
Dave reported a panic because the extent_root->commit_root was NULL in the caching kthread. That is because we just unset it in free_root_pointers, which is not the correct thing to do, we have to either wait for the caching kthread to complete or hold the extent_commit_sem lock so we know the thread has exited. This patch makes the kthreads all stop first and then we do our cleanup. This should fix the race. Thanks, Reported-by: NDavid Sterba <dsterba@suse.cz> Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
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