[linux-lvm] invalid snapshot with umounted fs

[Christian Hesse]

Hello everybody,

I have a backup scripts that creates read-only snapshots from my lvm volumes,
then runs rsync on them.

This fails for one of my volumes, mount reports an unknown filesystem on the
snapshot. The only difference compared to my other volumes is the fact that
it is not mounted by default.
Mounting the filesystem fixes the problem, the snapshot is valid when created
from mounted filesystem.

I saw this behavior with lvm2 versions 2.02.116 to 2.02.119. Probably I did
not have this configuration before, so possibly the problem exists even
longer.
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