On Fri, 2015-12-04 at 13:07 +0000, Hugo Mills wrote: > I don't think it'll cause problems. Is there any guaranteed behaviour when btrfs encounters two filesystems (i.e. not talking about the subvols now) with the same UUID?
Given that it's long standing behaviour that people could clone filesystems (dd, etc.) and this just worked™, btrfs should at least handle such case gracefully. For example, when already more than one block device with a btrfs of the same UUID are known, then it should refuse to mount any of them. And if one is already known and another device pops up it should refuse to mount that and continue to normally use the already mounted one. Cheers, Chris.
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