Tracking down a workqueue io source

[Phillip Susi]

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I worked up some patches to use the ata SLEEP command instead of
STANDBY to save more power, but I have found that something in the
kernel keeps issuing a request to the disk ( no mounted filesystems on
it ) every 10 minutes.  This request resets the link bringing the disk
back up to STANDBY mode.  blktrace shows the process name is "pool" so
I guess it is a work queue item?  Inserting a dump_stack() was not
helpful.  How can I track down the source of this request?

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