On Wed, Dec 23, 2020 at 7:51 PM Chris Murphy <li...@colorremedies.com> wrote: > > mv will fail between destinations with different nodatacow settings, > hence cp.
Sorry. This is wrong. mv also works. mv tries three things in order: rename, reflink copy, traditional copy. In the above case, it's the last one that works. Rename fails because subvolumes are separate name spaces with their own pile of inodes, similar to (in this case) separate file systems. The reflink copy also fails because there is a cow nodatacow mismatch between source and destination. It's not possible to have shared extents that are both cow and nodatacow, so the file must be old fashioned copied, so it has exclusive extents that are nodatacow. (The copy task, once complete, is followed by an rm of the original file. Hence it looks like a move except, yeah, it's slow because it's a big VM file being copied.) -- Chris Murphy _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org
