zfs: unlock for 5.15

[Mic92]

Motivation for this change

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 21.11 Release Notes (or backporting 21.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[Mic92]

I tested this for a few days on my laptop.

[Mic92]

1 package failed to build:
linuxKernel.packages.linux_hardened.zfsUnstable

19 packages built:
linuxKernel.packages.linux_4_14.zfsUnstable linuxKernel.packages.linux_4_14_hardened.zfsUnstable linuxKernel.packages.linux_4_19.zfsUnstable linuxKernel.packages.linux_4_19_hardened.zfsUnstable linuxKernel.packages.linux_4_4.zfsUnstable linuxKernel.packages.linux_4_9.zfsUnstable linuxKernel.packages.linux_5_10.zfsUnstable linuxKernel.packages.linux_5_14.zfsUnstable linuxKernel.packages.linux_5_14_hardened.zfsUnstable linuxKernel.packages.linux_5_15.zfsUnstable linuxKernel.packages.linux_5_4.zfsUnstable linuxKernel.packages.linux_5_4_hardened.zfsUnstable linuxKernel.packages.linux_latest_libre.zfsUnstable linuxKernel.packages.linux_libre.zfsUnstable linuxKernel.packages.linux_lqx.zfsUnstable linuxKernel.packages.linux_testing_bcachefs.zfsUnstable linuxKernel.packages.linux_xanmod.zfsUnstable linuxKernel.packages.linux_zen.zfsUnstable zfsUnstable

[Mic92]

@hmenke should I do the same for zfs stable? I will test this version now for linux 5.15.

[hmenke]

I think I'll just write an email to the OpenZFS maintainers and ask them to merge and bump kernel compatibility in a more timely manner.

[hmenke]

Another option would be to change the documentation for the zfsUnstable derivation and NixOS option and simply track the master branch at all times with no restrictions on kernel compatibility. Truly unstable, so to speak.

[Mic92]

Another option would be to change the documentation for the zfsUnstable derivation and NixOS option and simply track the master branch at all times with no restrictions on kernel compatibility. Truly unstable, so to speak.

I only remember in the past this used to be not enough because sometimes PRs where needed to fix kernel compatibility. But it could be that things changed.

[hmenke]

@Mic92 What do you think of hmenke@2b1e906? That is probably a good middle ground. See also #145485

[Mic92]

@Mic92 What do you think of hmenke@2b1e906? That is probably a good middle ground. See also #145485

I think I prefer that approach.

[Mic92]

It seems like there is still discussion going on in #145485

I would like to go ahead and merge this. As it is working for me.

[hmenke]

I don't think, disabling the compatibility check without a message in the release notes is a good idea.

[Mic92]

I don't think, disabling the compatibility check without a message in the release notes is a good idea.

I don't understand. This pr does not disable any compatibility checks.

[hmenke]

Yes, it does. ZFS 2.1.1 is not compatible with Linux 5.15.

Linux-Maximum: 5.14

https://github.com/openzfs/zfs/blob/zfs-2.1.1/META#L9

[Mic92]

Well, linux 5.15 was released two weeks after this zfs release but there were no breaking changes after that - the current version of zfs already had build fixes for 5.15 based on linux master at the time.
I am running on 5.15.1 just fine.

[Mic92]

Even if you look at the next patch release of zfs there are no changes related to linux 5.15: https://github.com/openzfs/zfs/commits/zfs-2.1.2-staging
Master already prepares for 5.16, so we won't see anything new.

[hmenke]

I'm extremely unhappy with this “solution” because in a few weeks we will have the exact same problem again and now the upstream compatibility notes do not hold anymore, but the branch-off for 21.11 is imminent, so this should just be merged to at least have something to work with.

[Mic92]

We can still backport 2.1.2 to stable and have zfsUnstable on stable follow the version on nixpkgs-unstable to allow the use of newer kernels. I think this worked quite well for the last release.

[TredwellGit]

This should be reverted. Upstream says that the maximum version for 2.1.1 is 5.14 and this pull request does not build because https://github.com/Mic92/nixpkgs/blob/86e057aa5b6b44aa20b65ed194ec359e897bd89d/pkgs/os-specific/linux/zfs/default.nix#L19 was not updated.

Updating zfsStable just because it works in your specific configuration could place others' data at risk.

[TredwellGit]

#146310