linux-kernel - 9p caching with cache=loose and cache=fscache

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Date:   Sat, 11 Mar 2023 14:47:47 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     ericvh@...il.com, lucho@...kov.net, asmadeus@...ewreck.org
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: 9p caching with cache=loose and cache=fscache

We've embraced 9p on kdevops [0] for support to let a guest use a host's
path to install Linux. This works well except I notice that if the host
makes new changes the guest does not see it. This just means the guest
has to reboot every time before running 'make modules_install install -j 8'
and it is unexpected and not user friendly.

I wanted to see if someone was working on fixing this yet. I've tested
with both cache=loose and cache=fscache. We use msize 131072, no
security and virtio-9p-pci.

[0] https://github.com/linux-kdevops/kdevops

  Luis