Re: [PATCH 4/4] xfs_db: add command to copy directory trees out of filesystems

Christoph Hellwig
2025-02-20T06:20:54Z

On Wed, Feb 19, 2025 at 10:30:56AM -0800, Darrick J. Wong wrote:
> If instead it turns out that 2037-era userspace (coughsystemdcough)
> doesn't work on an old 2030 kernel, then they'll have to go install a
> 2030-era userspace, boot the 2030 kernel, and migrate the data. Now
> they have a V5 filesystem with 2030 era features. If they want 2037 era
> features, they have to move the device to the new system and migrate a
> second time.

You probably wouldn't boot the old kernel on hardware but in a VM.
Or have and old user mode Linux build around :)