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bug#43062: --expose in vm does not reflect file modifications in guest

From: Ludovic Courtès
Subject: bug#43062: --expose in vm does not reflect file modifications in guest
Date: Mon, 31 Aug 2020 15:52:11 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)


Christopher Baines <mail@cbaines.net> skribis:

> Ludovic Courtès <ludo@gnu.org> writes:
>> Hi,
>> elaexuotee--- via Bug reports for GNU Guix <bug-guix@gnu.org> skribis:
>>> When using --expose to mirror a path between host and guest, the guest 
>>> mirror
>>> fails to reflect file modifications from the host. However, file creation 
>>> and
>>> deletion are correctly propogated.
>>> To pick up file modifications in the guest, it is sufficient to remount
>>> mirroring 9p filesystem.
>>> Is this behaviour expected?
>> I believe this comes from the “cache=loose” 9p mount option added in
>> commit e0d96774dd48c29ccc4c90fea1f8f71850ab0879.
>> Does the patch below help?
>> Chris, what do you think?  How would this affect the performance issues
>> that led to e0d96774dd48c29ccc4c90fea1f8f71850ab0879?
> Caching only for readonly filesystems sounds fine, I think I was only
> thinking about the store for e0d96774dd48c29ccc4c90fea1f8f71850ab0879.

Alright, I went ahead and did that in



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