btrfs: tree-checker: check for overlapping extent items
We're seeing a weird problem in production where we have overlapping extent items in the extent tree. It's unclear where these are coming from, and in debugging we realized there's no check in the tree checker for this sort of problem. Add a check to the tree-checker to make sure that the extents do not overlap each other. Reviewed-by: NQu Wenruo <wqu@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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