[Bug 2054809] Re: linux: please move erofs.ko (CONFIG_EROFS for EROFS support) from linux-modules-extra to linux-modules

** Tags removed: verification-needed-jammy-linux-xilinx-zynqmp
** Tags added: verification-done-jammy-linux-xilinx-zynqmp

** Tags removed: verification-needed-focal-linux-oracle-5.15 verification-needed-jammy-linux-bluefield verification-needed-jammy-linux-intel-iotg verification-needed-jammy-linux-nvidia-tegra-igx verification-needed-mantic-linux-raspi
** Tags added: verification-done-focal-linux-oracle-5.15 verification-done-jammy-linux-bluefield verification-done-jammy-linux-intel-iotg verification-done-jammy-linux-nvidia-tegra-igx verification-done-mantic-linux-raspi

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https://bugs.launchpad.net/bugs/2054809

Title:
linux: please move erofs.ko (CONFIG_EROFS for EROFS support) from
linux-modules-extra to linux-modules

Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
Fix Released
Status in linux source package in Mantic:
Fix Released
Status in linux source package in Noble:
Fix Released

Bug description:
SRU Justification

[Impact]

The erofs.ko module (CONFIG_EROFS) is currently shipped in linux-
modules-extra. This makes it hard to pull in via the linux-virtual
package, it can only come from the linux-generic one that also pulls
in the firmware and everything else needed for baremetal, and that
serves no purpose in a qemu VM. This stops VMs using these kernels
from using the erofs filesystem. Erofs is a modern alternative to
squashfs that supports more features such as ACLs. The following LPC
presentation has more details on erofs and its advantages over
squashfs: https://youtu.be/jt-hp_LtSBc.

A user launching a VM using the linux-virtual kernel image is not able
to mount erofs filesystems due to the lack of this kconfig. We make
extensive use of erofs in systemd's upstream CI, which is running on
Github Actions, which uses Jammy, so it would be great to have this
backported.

[Fix]

Please consider moving this module to linux-modules.

These are already enabled in the 'main' kernel config, and in other
distros. In Debian/Archlinux/Fedora it is a (core) module that is
built by default.

To verify this works, it is sufficient to create an erofs filesystem
with mkfs.erofs and verify that it can be mounted:

$ mkdir sources
$ echo abcde > sources/file
$ mkfs.erofs erofs sources
$ mount erofs mnt --mkdir
$ ls mnt
file

Without this module installed and loaded, the mount will fail. Once
enabled, it will succeed.

[Test]

1. pull built linux-modules packages for architectures with do_extras_package
set to true;
2. extract the deb and check if erofs kernel module file exists:

$ dpkg-deb -R linux-modules-*.deb .
$ find . -name erofs.ko\*

[Regression Potential]

Moving a module from a less-common to a more-common package should not
have any negative side effects. The main effect will be a little more
disk space used by the more common package, whether the module is in
use or not. There will also be more functionality available in the
default installation, which means a slightly increased surface and
possibility of new bugs in case it gets used.

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