Neil Brown wrote:
How likely it would be to get two requests with the same sector number
I don't know. I wouldn't expect it to ever happen - I have seen it
before, but it was due to a bug in ext3. Maybe XFS does it
intentionally some times?
It certainly sounds like an odd thing to occur.
Even stranger that it's easier to hit on a degraded array or an array being checked.
I *am* using ext3 on this box (and all my boxes in fact)
You could test this theory by putting a
WARN_ON(cfqq->next_rq == NULL);
at the end of cfq_reposition_rq_rb, just after the cfq_add_rq_rb call.
I've done that.. now to wait for it to hit again.
Brad
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