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mirror of https://gitlab.com/libvirt/libvirt.git synced 2025-03-07 17:28:15 +00:00
Ján Tomko 8b316fe5da Fix shrinking volumes with the delta flag
This never worked.

In 0.9.10 when this API was introduced, it was intended that
the SHRINK flag combined with DELTA would shrink the volume by
the specified capacity (to avoid passing negative numbers).
See commit 055bbf4.

When the SHRINK flag was finally implemented for the first backend
in 1.2.13 (commit aa9aa6a), it was only implemented for the absolute
values and with the delta flag the volume is always extended,
regardless of the SHRINK flag.

Treat the SHRINK flag as a minus sign when used together with DELTA,
to allow shrinking volumes as was documented in the API since 0.9.10.

https://bugzilla.redhat.com/show_bug.cgi?id=1220213
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         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>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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