spurious -ENOSPC on XFS

[Christoph Hellwig]

On Thu, Jan 22, 2009 at 03:59:13PM -0500, Christoph Hellwig wrote:
> On Wed, Jan 21, 2009 at 10:24:22AM +1100, Dave Chinner wrote:
> > Right, so you need to use internal xfs sync functions that don't
> > have these problems. That is:
> > 
> > 	error = xfs_sync_inodes(ip->i_mount, SYNC_DELWRI|SYNC_WAIT);
> > 
> > will do a blocking flush of all the inodes without deadlocks occurring.
> > Then you can remove the 500ms wait.
> 
> I've given this a try with Eric's testcase from #724 in the oss bugzilla,
> but it's not enough yet.  I thinks that's because SYNC_WAIT is rather
> meaningless for data writeout, and we need SYNC_IOWAIT instead.  The
> patch below gets the testcase working for me:

Actually I still see failures happing sometimes.  I guess tha'ts because
our flush is still asynchronous due to the schedule_work..