XFS read hangs in 3.1-rc10

[Christoph Hellwig]

On Mon, Nov 28, 2011 at 11:05:54AM -0800, Simon Kirby wrote:
> On Sun, Nov 20, 2011 at 10:32:41AM -0500, Christoph Hellwig wrote:
> 
> > On Wed, Nov 16, 2011 at 11:56:43AM -0800, Simon Kirby wrote:
> > > Sorry for the delay in testing.
> > > 
> > > Yes, everything looks fine even with the xfs_log_force line from your
> > > patch commented out. So, the changes in xfs_reclaim_inode() are just the
> > > set_bit(XBT_FORCE_FLUSH) and wake_up_process(), relative to 3.1.
> > 
> > Dave pointed out that we can do better than the big hammer, and the
> > patch below should fix your issue, too.  Can you test it?
> 
> Yes, seems to be fine. No hung task warnings, tested for ~5 days.

Thanks a lot for the testing Simon.

Ben, can you add a:

Tested-by: Simon Kirby <sim at hostway.ca>

to the patch when applying it?