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Let's assume I have a KVM-based virtual machine. There is a volume that contains the operating system and the data.

I know it is possible to access from host at least READ-ONLY the filesystem which is on guest.

If it is possible to access the guest FS in RW mode, then could I somehow detect that the filesystem was mounted?

The filesystem is ext4, is it storing any information about how and when it was mounted?

  • Just the dirty bit. – Michael Hampton Oct 19 '18 at 18:47
  • @MichaelHampton I would have expected that to work. But when I verified with tune2fs on a file system definitely mounted rw, I saw this: Filesystem state: clean. I think that's because that bit has a different meaning when journaling is in use. – kasperd Oct 19 '18 at 19:32
  • LVM track usage of partition with "o" flag in lvs command. – Michal Petrilak Oct 22 '18 at 14:51

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