fa58f571ee
The libvirt libxl driver has no access to FDs associated with VM disks. The disks are opened by libxl.so and any related FDs are not exposed to applications. The prevents using virtlockd's auto-release feature to release locks when the FD is closed. Acquiring and releasing locks is explicitly handled by the libxl driver. The current logic is structured such that locks are acquired in libxlDomainStart and released in libxlDomainCleanup. This works well except for migration, where the locks must be released on the source host before the domain can be started on the destination host, but the domain cannot be cleaned up until the migration confirmation stage. When libxlDomainCleanup if finally called in the confirm stage, locks are again released resulting in confusing errors from virtlockd and libvirtd virtlockd[8095]: resource busy: Lockspace resource 'xxxxxx' is not locked libvirtd[8050]: resource busy: Lockspace resource 'xxxxxx' is not locked libvirtd[8050]: Unable to release lease on testvm The error is also encountered in some error cases, e.g. when libxlDomainStart fails before acquiring locks and libxlDomainCleanup is still used for cleanup. In lieu of a mechanism to check if a lock has been acquired, this patch takes an easy approach to fixing the unnecessary lock releases by adding an indicator to the libxlDomainPrivate object that can be set when the lock is acquired and cleared when the lock is released. libxlDomainCleanup can then skip releasing the lock in cases where it was previously released or never acquired in the first place. Signed-off-by: Jim Fehlig <jfehlig@suse.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com> |
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| CONTRIBUTING.rst | ||
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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 2.0 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.
Installation
Instructions on building and installing libvirt can be found on the website:
https://libvirt.org/compiling.html
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: