Add support for other filesystems that support reflink

[Schweber]

The manual states that the -d option only works on btrfs and xfs.

It is my understanding (please correct me if i'm wrong) that all filesystems with reflink can be deduplicated. This would include bcachefs, zfs and f2fs.

If this is indeed the case, i kindly suggest to support them as well.

[ErrorNoInternet]

They need to support a specific ioctl, not just reflink. But if they support reflinks then it should be fairly straightforward for them to implement the ioctl.

ZFS for example: openzfs/zfs#15393

[Schweber]

I see. Thank you for the explaination and sorry for my ignorance.

[trougnouf]

It looks like bcachefs supports the necessary FIDEDUPERANGE ioctl (per koverstreet/bcachefs#622 ).