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

[Christopher Baines]

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.

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