Lee Yarwood 7c7a25aa1e workarounds: Add option to locally attach RBD volumes on compute hosts ...

Building on the ``[workarounds]/disable_native_luksv1``
configurable introduced in Ia500eb614cf575ab846f64f4b69c9068274c8c1f
this change introduces another workaround configurable that when enabled
will connect RBD volumes to the compute host as block devices using
os-brick.

When used togther both options allow operators to workaround recently
discovered performance issues in the libgcrypt library used by QEMU when
natively decrypting LUKSv1 encrypted disks.

For now the extend_volume method raises a NotImplemented error in-line
with the underlying method in os-brick. Future work will be required to
both support this in os-brick and wire up the required calls in the
volume driver.

This workaround is temporary and will be removed during the W release
once all impacted distributions have been able to update their versions
of the libgcrypt library.

Finally os-brick 3.0.1 is now required as it provides the
Id507109df80391699074773f4787f74507c4b882 fix when attempting to
diconnect locally attached RBD volumes.

Closes-Bug: #1869184
Change-Id: Ied3732042738a6194b635c55e0304d71a6fb66e3

2020-04-06 21:59:08 +01:00

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