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

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(-)