Linux kernel >= 6.6 default value of CONFIG_NFS_V4_2_READ_PLUS=y breaks nfs-ganesha < 6.2

[ader1990]

Hello,

I opened this issue to gather all the information about an issue with Linux versions and nfs-ganesha incompatibiliy regarding writing and reading files not working correctly anymore, which is a fundamental feature.

According to torvalds/linux@9cf2744, CONFIG_NFS_V4_2_READ_PLUS is now enabled from Linux kernel 6.6 onwards.

Recently, there was a bug report on Flatcar on a possible issue with nfs-ganesha and flatcar/Flatcar#1565.

From my investigation, Flatcar Linux kernel 6.6 has the default option value for CONFIG_NFS_V4_2_READ_PLUS, which is yes = enabled. When I tried with CONFIG_NFS_V4_2_READ_PLUS=n, the issue was gone.

There is a commit 24da5c3 that just landed recently in the repo, which might fix the issue (still to be tested).

Note that this repository still needs to be updated: https://github.com/kubernetes-sigs/nfs-ganesha-server-and-external-provisioner if the commit is proven to fix the issue.

Thanks.

[ffilz]

Any status with that fix you identified?

[ffilz]

Also, we don't maintain the Kubernetes bits, so if that does need updating, please submit an issue there.

[ader1990]

Also, we don't maintain the Kubernetes bits, so if that does need updating, please submit an issue there.

Already did, and there is a PR in progress. I will test once the PR has been merged, as I cannot test if the issue gets solved in a easy manner, as that PR creates the required docker images and more:

kubernetes-sigs/nfs-ganesha-server-and-external-provisioner#152