On Thu, Sep 15, 2016 at 01:47:11PM +0200, Alexander Graf wrote:
> However, because we have people who have Leap 42.1 and current
> Tumbleweed installed, we can’t just switch from 64k to 4k PAGE_SIZE,
> because our friend btrfs embeds the page size into its on-disk format
> and can only read it when they’re identical. So switching would break
> existing btrfs installations.

The page size is used automatically at the mkfs time and stored
independently as 'sectorsize'. The on-disk format does not depend on any
runtime variables, it's the other way around (ie. runtime must support
the on-disk values).
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