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Change startup procedure

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Current startup procedure works on an assumption that we will
deal with asynchronously appearing devices in asynchronous way
(udev rules) and synchronous events in the system (systemd units)
won't interfere. If we would break anything (mounts) we would just
take those units and restart them. This tactic was working as long
as resetting systemd units took reasonable time.

As hackish as it sounds it worked in all systems that the software
has been validated on. Unfortunately it stopped working because
of *.mount units taking MUCH longer time to restart even on
mainstream OSes, so it's time to change.

This change implements open-cas systemd service which will wait
synchronously with systemd bootup process for all required Open CAS
devices to start. If they don't we fail the boot process just as
failing mounts would. We also make sure that this process takes place
before any mounts (aside from root FS and other critical FS's) are
even attempted. Now opencas-mount-utility can be discarded.

To override this behaviour on per-core basis you can specify
lazy_startup=true option in opencas.conf.

Signed-off-by: Jan Musial <jan.musial@intel.com>
This commit is contained in:
Jan Musial
2019-10-23 16:18:00 +02:00
parent db1cb96010
commit aaedfb35dd
8 changed files with 227 additions and 65 deletions
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33
utils/Makefile
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@@ -9,25 +9,11 @@ UDEV:=$(shell which udevadm)
SYSTEMCTL := $(shell which systemctl)
PYTHON3 := $(shell which python3)
ifeq (, $(shell which systemctl))
define cas_install
install -m 755 open-cas-shutdown /etc/init.d/open-cas-shutdown
/sbin/chkconfig open-cas-shutdown on; service open-cas-shutdown start
endef
else
ifneq "$(wildcard /usr/lib/systemd/system)" ""
SYSTEMD_DIR=/usr/lib/systemd/system
else
SYSTEMD_DIR=/lib/systemd/system
endif
define cas_install
install -m 644 open-cas-shutdown.service $(SYSTEMD_DIR)/open-cas-shutdown.service
install -m 755 -d $(SYSTEMD_DIR)/../system-shutdown
install -m 755 open-cas.shutdown $(SYSTEMD_DIR)/../system-shutdown/open-cas.shutdown
$(SYSTEMCTL) daemon-reload
$(SYSTEMCTL) -q enable open-cas-shutdown
endef
endif
# Just a placeholder when running make from parent dir without install/uninstall arg
all: ;
@@ -42,7 +28,6 @@ else
@install -m 644 opencas.py $(CASCTL_DIR)/opencas.py
@install -m 755 casctl $(CASCTL_DIR)/casctl
@install -m 755 open-cas-loader $(CASCTL_DIR)/open-cas-loader
@install -m 755 open-cas-mount-utility $(CASCTL_DIR)/open-cas-mount-utility
@ln -fs $(CASCTL_DIR)/casctl /sbin/casctl
@@ -55,14 +40,19 @@ else
@install -m 644 casctl.8 /usr/share/man/man8/casctl.8
$(cas_install)
@install -m 644 open-cas-shutdown.service $(SYSTEMD_DIR)/open-cas-shutdown.service
@install -m 644 open-cas.service $(SYSTEMD_DIR)/open-cas.service
@install -m 755 -d $(SYSTEMD_DIR)/../system-shutdown
@install -m 755 open-cas.shutdown $(SYSTEMD_DIR)/../system-shutdown/open-cas.shutdown
@$(SYSTEMCTL) daemon-reload
@$(SYSTEMCTL) -q enable open-cas-shutdown
@$(SYSTEMCTL) -q enable open-cas
endif
uninstall:
@rm $(CASCTL_DIR)/opencas.py
@rm $(CASCTL_DIR)/casctl
@rm $(CASCTL_DIR)/open-cas-loader
@rm $(CASCTL_DIR)/open-cas-mount-utility
@rm -rf $(CASCTL_DIR)
@rm /sbin/casctl
@@ -71,6 +61,15 @@ uninstall:
@rm /lib/udev/rules.d/60-persistent-storage-cas-load.rules
@rm /lib/udev/rules.d/60-persistent-storage-cas.rules
@$(UDEV) control --reload-rules
@$(SYSTEMCTL) -q disable open-cas-shutdown
@$(SYSTEMCTL) -q disable open-cas
@$(SYSTEMCTL) daemon-reload
@rm $(SYSTEMD_DIR)/open-cas-shutdown.service
@rm $(SYSTEMD_DIR)/open-cas.service
@rm $(SYSTEMD_DIR)/../system-shutdown/open-cas.shutdown
.PHONY: install uninstall clean distclean