b04629b629
When adding a new object to the domain object list, there should have been 2 virObjectRef calls made one for each list into which the object was placed to match the 2 virObjectUnref calls that would occur during Remove as part of virHashRemoveEntry when virObjectFreeHashData is called when the element is removed from the hash table as set up in virDomainObjListNew. Some drivers (libxl, lxc, qemu, and vz) handled this inconsistency by calling virObjectRef upon successful return from virDomainObjListAdd in order to use virDomainObjEndAPI when done with the returned @vm. While others (bhyve, openvz, test, and vmware) handled this via only calling virObjectUnlock upon successful return from virDomainObjListAdd. This patch will "unify" the approach to use virDomainObjEndAPI for any @vm successfully returned from virDomainObjListAdd. Because list removal is so tightly coupled with list addition, this patch fixes the list removal algorithm to return the object as entered - "locked and reffed". This way, the callers can then decide how to uniformly handle add/remove success and failure. This removes the onus on the caller to "specially handle" the @vm during removal processing. The Add/Remove logic allows for some logic simplification such as in libxl where we can Remove the @vm directly rather than needing to set a @remove_dom boolean and removing after the libxlDomainObjEndJob completes as the @vm is locked/reffed. Signed-off-by: John Ferlan <jferlan@redhat.com> Reviewed-by: Erik Skultety <eskultet@redhat.com>
Libvirt API for virtualization
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.
For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.
Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.
Further information about the libvirt project can be found on the website:
License
The libvirt C API is distributed under the terms of GNU Lesser General
Public License, version 2.1 (or later). Some parts of the code that are
not part of the C library may have the more restrictive GNU General
Public License, version 2.1 (or later). See the files COPYING.LESSER
and COPYING for full license terms & conditions.
Installation
Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands. For example, to build in a manner that is suitable for installing as root, use:
$ ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install
While to build & install as an unprivileged user
$ ./configure --prefix=$HOME/usr
$ make
$ make install
The libvirt code relies on a large number of 3rd party libraries. These will
be detected during execution of the configure script and a summary printed
which lists any missing (optional) dependencies.
Contributing
The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:
https://libvirt.org/contribute.html
Contact
The libvirt project has two primary mailing lists:
- libvirt-users@redhat.com (for user discussions)
- libvir-list@redhat.com (for development only)
Further details on contacting the project are available on the website: