[PATCH] xfs: check on-disk (not incore) btree root size in dfrag.c

[Ben Myers]

On Wed, Jun 19, 2013 at 04:51:41PM -0500, Eric Sandeen wrote:
> On 3/27/12 3:40 PM, Eric Sandeen wrote:
> > xfs_swap_extents_check_format() contains checks to make sure that
> > original and the temporary files during defrag are compatible;
> > Gabriel VLASIU ran into a case where xfs_fsr returned EINVAL
> > because the tests found the btree root to be of size 120,
> > while the fork offset was only 104; IOW, they overlapped.
> > 
> > However, this is just due to an error in the
> > xfs_swap_extents_check_format() tests, because it is checking
> > the in-memory btree root size against the on-disk fork offset.
> > We should be checking the on-disk sizes in both cases.
> > 
> > This patch adds a new macro to calculate this size, and uses
> > it in the tests.
> > 
> > With this change, the filesystem image provided by Gabriel
> > allows for proper file degragmentation.
> 
> I think this and the followup patch 2/1 got lost.
>
> Ben, any idea?

Yeah.  Sorry Eric.