Re: [PATCH] xfs: detect agfl count corruption and reset agfl

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On Thu, Mar 15, 2018 at 06:38:39AM -0400, Brian Foster wrote:
> On Wed, Mar 14, 2018 at 03:42:50PM -0500, Dave Chiluk wrote:
> > On Wed, Mar 14, 2018 at 1:12 PM, Darrick J. Wong
> > <darrick.wong@xxxxxxxxxx> wrote:
> > > On Wed, Mar 14, 2018 at 01:17:24PM -0400, Brian Foster wrote:
> ...
> > 
> > Reviewed-by Dave Chiluk <chiluk+linuxxfs@xxxxxxxxxx>
> > 
> > I'm also assuming this will get submitted back to the linux-stable
> > trees as the agfl packing change is already causing issues in the
> > stable trees.  If you do not intend to push it into the linux-stable
> > trees let me know and I'll take care of at least the major ones.
> > 
> 
> Yeah, I can cc stable in the next post along with the other minor fixes.
> My question is how far back should this fix go? Was the plan to only go
> back to v4.5 because that is where the packing fix first went in? Or
> should this go back further because it looks like the packing fix was
> backported to v3.10:
> 
> $ git show 96f859d52bcb1
> commit 96f859d52bcb1c6ea6f3388d39862bf7143e2f30
> Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> Date:   Mon Jan 4 16:13:21 2016 +1100
> 
>     libxfs: pack the agfl header structure so XFS_AGFL_SIZE is correct
>     
>     ...
>     
>     cc: <stable@xxxxxxxxxxxxxxx> # 3.10 - 4.4
>     Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>     Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
>     Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>

Hmmm, I'm assuming that you'd want 3.10 at least for RHEL, but I'll let
you all figure that one out.

As far as the upstream kernels, 4.14.27, 4.9.87, 4.4.121, and 4.1.50
have that packing patch so I guess they'll all need some version of this.

--D

> 
> Brian
> 
> > Thanks,
> > Dave
> > --
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