btrfs fi df shows "unknown" ?

Hi there,

Since a few days, I have noticed that "btrfs fi df /" displays an entry about "unknown" used space, and I can see this on several Fedora machines, so it is not an issue related to a given system...

Does anybody know what these "unknown" data are ?

i.e:

# btrfs fi df /
Data, single: total=106.00GiB, used=88.28GiB
System, DUP: total=32.00MiB, used=24.00KiB
Metadata, DUP: total=1.00GiB, used=520.36MiB
unknown, single: total=176.00MiB, used=0.00

# btrfs --version
Btrfs v3.14.2

# uname -r
3.15.5-200.fc20.x86_64

TIA, kind regards.

Swâmi Petaramesh <[email protected]> http://petaramesh.org PGP 9076E32E

It's the block reserve, which used to be part of metadata, but is
now split out to its own type. An updated userspace should be able to show it properly.

Hugo.

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