[PATCH 03/16] xfs: rmap btree add more reserved blocks

[Christoph Hellwig]

On Fri, Mar 11, 2016 at 09:09:45AM +1100, Dave Chinner wrote:
> The root btree blocks are not a fixed location. The moment the tree
> splits to the root we get a new root block and the old root is now
> at a lower level of the tree. IOWs, it doesn't matter if there is a
> hole at the time of growfs/mkfs laying out the initial tree roots
> because they are going to move around anyway.

Yeah, once we update the root it moves anyway.  Objection retracted..