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SubjectRe: IDE locking problem

> > would help making sure we don't get a request sneaking in ?
> Hmm not really, there's still a chance that could happen.

Not too familiar with BIO here, but we would need some kind of
"dead" flag to cause a reject of any try to insert a new request
in the queue, don't you think ?

Then, IDE could do something like:

- set dead flag
- wait for all pending requests to drain (easy: insert a barrier
in the queue and wait on it, with a hack for the barrier insertion
to bypass the dead flag... ugh... maybe a blk_terminate_queue()
doing all that would be helpful ?)
- unregister blkdev
- then tear down the queue (leaving the "empty" queue with the dead
flag set, not just memset(...,0,...), so that any bozo keeping a
reference to it will be rejected trying to insert request instead
of trying to tap an uninitalized queue object

What do you think ?


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