Whilst trying to understand the problem I looked at the source of nfsmount in klibc. Nfsmount has a switch statement in which it checks the value of nfsvers and only proceeds if it is 2 or 3. Given that my version of nfsmount, compiled with klcc, can indeed mount using NFSv4 I suspect that in libc's version the switch statement only needs to be extended with the cases 4, 4.0, 4.1 and 4.2. It's not entirely trivial, but it's hard to understand why it hasn't been done sometime during the last 15 years.
I may take a closer look when I've fixed my next bug. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to klibc in Ubuntu. https://bugs.launchpad.net/bugs/1954716 Title: rpi nfsroot vers=4 not supported anymore? Status in klibc package in Ubuntu: Confirmed Status in linux-raspi package in Ubuntu: Invalid Bug description: I'm running `5.13.0-1011-raspi #13-Ubuntu SMP PREEMPT Fri Nov 19 18:40:23 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux` and have successfully set up netbooting on my RPi 4B (4GB). When I do not specify a `vers=` in cmdline.txt, NFS version 3 is used. I'd like to move to version 4, but unlike the setup described in https://forums.raspberrypi.com/viewtopic.php?p=1751741#p1751741, I cannot get `vers=4` (or any sub-version to work): the console logs `invalid value for vers.` for whatever I try. Current working cmdline.txt: ``` dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/nfs nfsroot=192.168.3.101:/srv/pinet/root,tcp ro ip=dhcp rootwait fixrtc splash ``` Nonworking cmdline.txt: ``` dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/nfs nfsroot=192.168.3.101:/srv/pinet/root,tcp,vers=4 ro ip=dhcp rootwait fixrtc splash ``` To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/klibc/+bug/1954716/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
