3f702f5ab1
We have been trying to implement the ALLOCATE flag to mean "the volume should be fully allocated after the resize". Since commit b0579ed9 we do not allocate from the existing capacity, but from the existing allocation value. However this value is a total of all the allocated bytes, not an offset. For a sparsely allocated file: $ perl -e 'print "x"x8192;' > vol1 $ fallocate -p -o 0 -l 4096 vol1 $ virsh vol-info vol1 default Capacity: 8.00 KiB Allocation: 4.00 KiB Treating allocation as an offset would result in an incompletely allocated file: $ virsh vol-resize vol1 --pool default 16384 --allocate Capacity: 16.00 KiB Allocation: 12.00 KiB Call fallocate from zero on the whole requested capacity to fully allocate the file. After that, the volume is fully allocated after the resize: $ virsh vol-resize vol1 --pool default 16384 --allocate $ virsh vol-info vol1 default Capacity: 16.00 KiB Allocation: 16.00 KiB
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: