Re: [PATCH 0/3] Enable the setting of a kernel module parameter from nfs.conf

[Steve Dickson <SteveD@RedHat.com>]

Hey!

On 4/15/21 8:40 PM, Trond Myklebust wrote:
> Here is a skeleton example:
> 
> [root@leira rules.d]# cat /etc/udev/rules.d/50-nfs4.rules 
> ACTION=="add" KERNEL=="nfs_client" ATTR{identifier}=="(null)" PROGRAM="/usr/sbin/nfs4_uuid" ATTR{identifier}="%c"
> 
> [root@leira rules.d]# cat /usr/sbin/nfs4_uuid 
> #!/bin/bash
> #
> if [ ! -f /etc/nfs4_uuid ]
> then
> 	uuid="$(uuidgen -r)"
> 	echo -n ${uuid} > /etc/nfs4_uuid
> else
> 	uuid="$(cat /etc/nfs4_uuid)"
> fi
> echo ${uuid}
> 
> 
> Obviously, the /usr/sbin/nfs4_uuid would need to be fleshed out a
> little more to ensure that the file /etc/nfs4_uuid actually contains a
> uuid in the right format, but you get the gist...
> 
> With the above additions, I end up with a repeatable
> 
> [root@leira rules.d]# modprobe nfs4
> [root@leira rules.d]# cat /sys/fs/nfs/net/nfs_client/identifier 
> 7f9f211b-0253-4ef8-a970-b1b0f600af02
> [root@leira rules.d]# cat /etc/nfs4_uuid 
> 7f9f211b-0253-4ef8-a970-b1b0f600af02

I see that this example does populate nfs_client/identifier and
I'm sure we could beef up the mechanism but the may question
is this.... 

How does populating nfs_client/identifier via udev
actually setting the nfs4_unique_id parameter which is used to set
the unique id? I look and i've must have missed it...

If the answer is we need to change the client to look a
the nfs_client/identifier... then we should get rid of the
nfs4_unique_id param all together... 

steved.