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The pvscan systemd service for autoactivation was
mistakenly dropped along with the lvmetad related
services.
The activation generator program now looks at the new
lvm.conf setting "event_activation" (default 1) to
switch between event activation and direct activation.
Previously, the old use_lvmetad setting was used to
switch between event and direct activation.
The device-mapper directory now holds a copy of libdm source. At
the moment this code is identical to libdm. Over time code will
migrate out to appropriate places (see doc/refactoring.txt).
The libdm directory still exists, and contains the source for the
libdevmapper shared library, which we will continue to ship (though
not neccessarily update).
All code using libdm should now use the version in device-mapper.
Drop 'DMEVENT' make variable and use BUILD_DMEVENTD like with other daemons.
NOTE: by default we do not build dmeventd - maybe time to change
as lot of build targets basically do need dmeventd...
Switch to use SYSTEMD_LIBS and avoid linking systemd library with
every linked tool when dbus notification are enabled.
(TODO add missing testing for lib presence)
lvm2_cluster_activation_red_hat.service.in -> lvm2_cluster_activation_systemd_red_hat.service.in
lvm2_clvmd_red_hat.service.in -> lvm2_clvmd_red_hat.service.in
Edit lvm2-cluster-activation reference on cmirror - take new
lvm2-cmirrord.service, it was just cmirrord(.service) before
as the old initscript was used in compatibility mode.
Also, use WantedBy=multi-user.target instead of sysinit.target
in lvm2-cluster-activation.service.
The commit splits original clvmd service in two new native services
for systemd enabled systems while original init scripts remain unaltered.
New systemd native services:
1) clvmd daemon itself (lvm2_clvmd_red_hat.service.in)
2) (de)activation of clustered VGs (lvm2_cluster_activation_red_hat.service.in)
There're several reasons to split it. First, there's no support for conditional
stop in systemd and AFAIK they don't plan to support it. In other words:
if the deactivation fails for some reason, systemd doesn't care and will simply
kill all remaining processes in original cgroup (by default). Killing the
remaining procs can be suppressed however it doesn't solve the following problem:
You can't repeat the stop command of a failed service. The repeated stop command
is simply not propagated to the service in a failed state. You would have to start
and then try to stop the service again. Unfortunately, this can't be done while
the daemon is still running (and we need the daemon to stay active until all
clustered VGs are deactivated properly).
In a separated setup we need only to restart the failed activation service and
that's fine.
The new lvm2-pvscan@.service is responsible for on-demand execution
of "pvscan --cache --activate ay" which causes lvmetad to be
updated and LVM activation done if the VG is complete.
Also, use udev-systemd mechanism to instantiate the job as the
lvm2-pvscan@$devnode.service on each newly appeared PV in the system.
This prevents the background job to be killed (that would happen
if it was directly forked from udev rule - this behaviour is seen
in recent versions of udev with the help of systemd that can track
detached processes - the detached process would still be in the same
cgroup).
To enable this official udev-systemd protocol for instantiating
background jobs, use new --enable-udev-systemd-background-jobs
configure switch (it's disabled by default). This option is highly
recommended wherever systemd is used!
blkdeactivate - utility to deactivate block devices
Traverses the tree of block devices and tries to deactivate them.
Currently, it supports device-mapper-based devices together with LVM.
See man/blkdeactivate.8 for more info.
It is targeted for use during shutdown to properly deactivate the
whole block device stack - systemd and init scripts are provided as
well. However, it might be used directly on command line too.
Please, see the commentary at the top of the blkdeactivate script
for dependencies and versions of other utilities required.
There were several hard-coded values for run directory around the code.
Also, some tools are DM specific only, others are LVM specific and there
was no distinction made here before. With this patch applied, we have
this cleaned up a bit (subsystem in brackets, defaults in parentheses):
[common] configurable PID_DIR (/var/run)
lvm [lvm] configurable RUN_DIR (/var/run/lvm)
configurable locking dir (/var/lock/lvm)
clvmd [lvm] configurable pid file (PID_DIR/clvmd.pid)
socket (RUN_DIR/clvmd.sock)
lvmetad [lvm] configurable pid file (PID_DIR/lvmetad.pid)
socket (RUN_DIR/lvmetad.socket)
dm [dm] configurable DM_RUN_DIR (/var/run)
cmirrord [dm] configurable pid file (PID_DIR/cmirrord.pid)
dmeventd [dm] configurable pid file (PID_DIR/dmeventd.pid)
server fifo (DM_RUN_DIR/dmeventd-server)
client fifo (DM_RUN_DIR/dmeventd-client)
The changes briefly:
- added configure --with-default-pid-dir
- added configure --with-default-dm-run-dir
- added configure --with-lvmetad-pidfile
- by default, using one common pid directory for everything
(only lvmetad was not following this before)
