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/ > > It's important to know all the limitations. Most people will find them > a non-issue. But... > > Like, where should the swapfile go? I think maybe /var/swap could be a > nested subvolume, i.e. actually create the subvolume in /var/. That's > pretty straightforward, and is compatible with rpm-ostree systems > where root is read-only. The catch is if there's any kind of rollback > of sysroot (on the subvolume typically named "root") because if > /var/swap is a subvolume, then the snapshot of the "root" subvolume on > / will stop at /var/swap. That's exactly what we want, to avoid > snapshotting it. But then on rollback of "root", /var/swap is just an > empty directory. So we need some intelligent handling up front, or at > the back end to find that older/pre-rollback /var/swap and move that > subvolume into the new position. Ick. Right? > > 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. > > 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. > Ok, I am out of ideas. Have created the swap file in a different subvolume from my root. I have also used btrfs_map_physical script to find the offset, but I am still getting "Not enough swap space for hibernation." What else can I do? -- Regards, Sreyan Chakravarty
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