On Wed, Dec 9, 2020 at 5:31 AM Chris Murphy <li...@colorremedies.com> wrote:
> I referred you to man 5 btrfs about a list of limitations of swapfiles > on btrfs 10 days ago. > > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org/message/XF7YO27N2XPWGLPMPUN76VFT3RW2KFYS/ Apologies, I missed that. > However, it might be better to have a "swap" subvolume along with > "root" and "home" in the top-level of the file system. And add it to > fstab or maybe we can create a native systemd mount unit. Importantly > we have to have complete certainty that this mount happens before > swapon, or it'll fail. So we can't have races either. Now both issues > are fixed. It won't be snapshot if we snapshot "root". But if we > rollback a "root" snapshot, then the same "swap" subvolume always > mounts into the proper position at /var/swap with the same swapfile. > > Ok, how can I guarantee that the swap subvolume will be mounted before swapon is executed ? Is swapon executed after all mounts in /etc/fstab by design ? Is there something else I can do to guarantee this? Or is there no way to guarantee this now ? Yes you were right. I have just restored my snapshot and now swap is malfunctioning. I guess that's because the physical offset of the file is different. But that automatic solution is also kinda hidden. So no matter what > there's some kind of tradeoff. And that's the long answer for why it's > not the default yet, and also not even documented how to do a > post-install setup of swap. But it's on my todo. > Lets hope you get around to it soon. -- Regards, Sreyan Chakravarty
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