[libvirt] [PATCH 00/12] introduce locking into every driver

[Daniel P. Berrangé]

As part of the proposal to introduce an embedded driver feature, we
decided we ought to have each driver acquire a lock against the virtual
root it is configured to use. This will prevent two apps from running an
embedded driver with the same root.

  https://www.redhat.com/archives/libvir-list/2019-May/msg00467.html

It turns out that this will also be useful for the per-driver split
daemons work I am working on. In that case libvirtd will exist as a
monolithic daemon running all drivers, and we'll also have per-driver
daemons like virtqemud, virtnetworkd, etc. It is only valid to run in
one setup on the host. ie you must choose libvirtd, or choose per-driver
daemons, never both.

The per-driver locking will provide very useful protection against
mistakes in this respect.

Since the locking is functionally independant of both patch series, I'm
sending it now.

Daniel P. Berrangé (12):
  qemu: acquire a pidfile in the driver root directory
  secrets: acquire a pidfile in the driver root directory
  network: acquire a pidfile in the driver root directory
  storage: acquire a pidfile in the driver root directory
  nodedev: acquire a pidfile in the driver root directory
  interface: acquire a pidfile in the driver root directory
  nwfilter: acquire a pidfile in the driver root directory
  libxl: remove obsolete check for xend during driver startup
  libxl: acquire a pidfile in the driver root directory
  lxc: acquire a pidfile in the driver root directory
  vz: acquire a pidfile in the driver root directory
  bhyve: acquire a pidfile in the driver root directory

 src/bhyve/bhyve_driver.c                |  9 +++++
 src/bhyve/bhyve_utils.h                 |  3 ++
 src/conf/virnodedeviceobj.h             |  5 +++
 src/conf/virnwfilterobj.h               |  4 +++
 src/conf/virstorageobj.h                |  3 ++
 src/interface/interface_backend_netcf.c | 45 +++++++++++++++++++++++--
 src/interface/interface_backend_udev.c  | 44 +++++++++++++++++++++++-
 src/libxl/libxl_conf.h                  |  3 ++
 src/libxl/libxl_driver.c                | 37 ++++++++------------
 src/lxc/lxc_conf.h                      |  3 ++
 src/lxc/lxc_driver.c                    |  9 +++++
 src/network/bridge_driver.c             | 10 ++++++
 src/network/bridge_driver_platform.h    |  3 ++
 src/node_device/node_device_hal.c       | 31 +++++++++++++++++
 src/node_device/node_device_udev.c      | 32 ++++++++++++++++++
 src/nwfilter/nwfilter_driver.c          | 19 +++++++++++
 src/qemu/qemu_conf.h                    |  3 ++
 src/qemu/qemu_driver.c                  |  9 +++++
 src/secret/secret_driver.c              | 44 +++++++++++++++++++-----
 src/storage/storage_driver.c            | 11 ++++++
 src/vz/vz_driver.c                      | 40 +++++++++++++++++++---
 21 files changed, 327 insertions(+), 40 deletions(-)

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2.21.0