netdev - Re: [PATCH] net/9p: autoload transport modules

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Date:   Tue, 2 Nov 2021 23:33:25 +0000 (UTC)
From:   Thomas Weißschuh  <thomas@...ch.de>
To:     Dominique Martinet <asmadeus@...ewreck.org>
Cc:     Thomas Weißschuh <linux@...ssschuh.net>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/9p: autoload transport modules


Nov 3, 2021 00:18:13 Dominique Martinet <asmadeus@...ewreck.org>:

> Thomas Weißschuh wrote on Tue, Nov 02, 2021 at 04:32:21PM +0100:
>>> with 9p/9pnet loaded,
>>> running "mount -t 9p -o trans=virtio tmp /mnt"
>>> request_module("9p-%s", "virtio") returns -2 (ENOENT)
>>
>> Can you retry without 9p/9pnet loaded and see if they are loaded by the mount
>> process?
>> The same autoloading functionality exists for filesystems using
>> request_module("fs-%s") in fs/filesystems.c
>> If that also doesn't work it would indicate an issue with the kernel setup in general.
>
> Right, that also didn't work, which matches modprobe not being called
> correctly
>
>
>>> Looking at the code it should be running "modprobe -q -- 9p-virtio"
>>> which finds the module just fine, hence my supposition usermodhelper is
>>> not setup correctly
>>>
>>> Do you happen to know what I need to do for it?
>>
>> What is the value of CONFIG_MODPROBE_PATH?
>> And the contents of /proc/sys/kernel/modprobe?
>
> aha, these two were indeed different from where my modprobe is so it is
> a setup problem -- I might have been a little rash with this initrd
> setup and modprobe ended up in /bin with path here in /sbin...
>
> Thanks for the pointer, I saw the code setup an environment with a
> full-blown PATH so didn't think of checking if this kind of setting
> existed!
> All looks in order then :)

Does it also work for the split out FD transports?
If so, I'll resend that patch in a proper form tomorrow.

Thomas