tree d440257f7624db52df1242afb7f2aff718ebe01c
parent 7db6982a19f61e3668397b5e31ebfb16a477c414
author Benoît Canet <benoit@irqsave.net> 1393017675 +0100
committer Kevin Wolf <kwolf@redhat.com> 1393018190 +0100

quorum: Add quorum mechanism.

This patchset enables the core of the quorum mechanism.
The num_children reads are compared to get the majority version and if this
version exists more than threshold times the guest won't see the error at all.

If a block is corrupted or if an error occurs during an IO or if the quorum
cannot be established QMP events are used to report to the management.

Use gnutls's SHA-256 to compare versions.

--enable-quorum must be used to enable the feature.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>