Excerpts from Calvin Walton's message of 2011-04-01 13:56:51 -0400:
> On Thu, 2011-03-31 at 18:59 -0400, Josef Bacik wrote:
> > On Thu, Mar 31, 2011 at 05:06:42PM -0400, Calvin Walton wrote:
> > > On Wed, 2011-03-30 at 17:19 -0400, Josef Bacik wrote:
> > > > Hello,
> > > > 
> > > > Just found a big bug in the free space caching stuff that will result 
> > > > in 
> > > > early ENOSPC.  I'm working on fixing this bug, but it won't be until 
> > > > tomorrow that I'll have it completely working, so for now make sure to 
> > > > mount -o clear_cache so that it just clears the cache and doesn't use 
> > > > it.
> > 
> > Yeah it affects any kernel that has the free space cache feature, which I 
> > think
> > started in .37.  Course you have to have specifically enabled it, so it's 
> > not a
> > huge problem.  I've submitted a patch, but since it's currently an optional
> > feature I don't think it needs to go to stable.  Thanks,
> 
> If you don't think the full fix is appropriate for the stable kernel,
> what about sending a simple patch to stable that just disables the free
> space caching support?
> 
> That should be enough to stop any adventurous users (of the kind who
> don't read mailing lists) from trying the free space caching support,
> and possibly hitting this bug.
> 

We'll have a known stable patch for this shortly, I'd rather do that and
send it back to the stable kernels.

-chris
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