XFS read hangs in 3.1-rc10

[Christoph Hellwig]

On Tue, Oct 25, 2011 at 01:07:48PM -0700, Simon Kirby wrote:
> This patch seems to work, at least on an SSD box. No more hung task
> warnings, and everything appears normal.
> 
> Do we know what caused this regression and/or how to fix it without the
> big hammer, or do we need to break it down further?

I have an idea and will send you a refined patch soon.  I'm at a
conference until tomorrow, so you'll probably have to wait another day
or two for it.