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Commit id 'df1011ca8' modified virStorageBackendDiskDeleteVol to use "dmsetup remove --force" to remove the volume, but left things in an inconsistent state since the partition still existed on the disk and only the device mapper device (/dev/dm-#) was removed. Prior to commit '1895b421' (or '1ffd82bb' and '471e1c4e'), this could go unnoticed since virStorageBackendDiskRefreshPool wasn't called. However, the pool would be unusable since the /dev/dm-# device would be removed even though the partition was not removed unless a multipathd restart reset the link. That would of course make the volume appear again in the pool after a refresh or pool start after libvirt reload. This patch removes the 'dmsetup' logic and re-implements the partition deletion logic for device mapper devices. The removal of the partition via 'parted rm --script #' will cause udev device change logic to allow multipathd to handle removing the dm-* device associated with the partition.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>