Ludovic Courtès fce2254711
vm: Use "cache=loose" for all 9p mounts.
This significantly improves read throughput when running things like
"guix hash -r ...".

* gnu/system/vm.scm (%linux-vm-file-systems): Add 'flags' for "store".
Add "cache=loose" to every file system.
2018-09-23 23:34:17 +02:00
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