Thanks for the help with the write access locking, Andries. It works
like a charm.
I've run into another bug, though. It occurs both in my crypto-enabled
kernel and the pristine no-crypto mainline kernel.
The loopback devices, even with the "none" transform, are hosing out
quite horribly. After a rather trivial amount of data write activity
across a loop device, the system locks on disk activity. 'ps' says
that they all got hung in __wait_on_buffer, which is defined in
fs/buffer.c. Any disk activity after that gets hung in
__wait_on_buffer(), rendering the system unusable. It's probably
coming from do_lo_request() loop.c, but I don't know quite enough
about the buffer cache system to troubleshoot it.
This occurs in the mainline kernel up to and including
2.4.0-test1-ac11.
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