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[Qemu-discuss] fsfreeze: not smart enough about duplicate/bind mounts?

From: Christian Theune
Subject: [Qemu-discuss] fsfreeze: not smart enough about duplicate/bind mounts?
Date: Tue, 15 Mar 2016 16:48:52 +0100


I just stumbled over a situation where fsfreeze wasn’t smart enough to notice 
that it tried to freeze the same filesystem twice (which ends in a “device or 
resource busy”).

Here’s how the mount looked like:

/dev/vda1 on / type xfs (rw,relatime,attr2,inode64,noquota)
/dev/vda1 on /nix/store type xfs (ro,relatime,attr2,inode64,noquota)

I see that Qemu has support for detecting bind mounts, and this _should_ be 
one, but I guess it’s really not. At least from what I can tell.

For now, I’m running without the second mount to make things work, but it would 
be really nice if the guest agent could be improved.


Christian Theune · address@hidden · +49 345 219401 0
Flying Circus Internet Operations GmbH · http://flyingcircus.io
Forsterstraße 29 · 06112 Halle (Saale) · Deutschland
HR Stendal HRB 21169 · Geschäftsführer: Christian. Theune, Christian. Zagrodnick

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