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Zach Brown
a4f5293e78
We can be performing final deletion as inodes are evicted during unmount. We have to keep full locking, transactions, and networking up and running for the evict_inodes() call in generic_shutdown_super(). Unfortunately, this means that workers can be using inode references during evict_inodes() which prevents them from being evicted. Those workers can then remain running as we tear down the system, causing crashes and deadlocks as the final iputs try to use resources that have been destroyed. The fix is to first properly stop orphan scanning, which can instantiate new cached inodes, up before the call to kill_block_super ends up trying to evict all inodes. Then we just need to wait for any pending iput and invalidate work to finish and perform the final iput, which will always evict because generic_shutdown_super has cleared MS_ACTIVE. Signed-off-by: Zach Brown <zab@versity.com>