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[Bug 1042551] os-prober + KVM on host kills btrfs in clients
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 07 Jun 2017 17:40:04 +0000
  • Message-id: <>

Andrei Borzenkov <arvidjaar@xxxxxxxxx> changed:

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--- Comment #3 from Andrei Borzenkov <arvidjaar@xxxxxxxxx> ---
I'm afraid I cannot tell why it insists on mounting read-write - this was in
original RH patch already. OTOH it is well known that even read-only mount may
change on-disk state for some filesystems (and I think btrfs is one of them).
Which means we should not really attempt to use kernel mount ever. We can use
grub-mount to access btrfs, but it requires some way to list subvolumes;
subvolume mount can probably be emulated then. I am not aware of tool that can
do it for unmounted btrfs.

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