It is expected that a watchdog module will disable an active watchdog when
its probe is called ie, when it is loaded. So an early load of the module
will help to disable it earlier.
This can be helpful in some corner cases where kdump and watchdog daemon
both are active.
Testing:
-- When watchdog kernel modules were added
# dracut --no-hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img -f etc/cmdline.d/00-watchdog.conf
rd.driver.pre=iTCO_wdt,lpc_ich,
Signed-off-by: Pratyush Anand <panand@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Harald Hoyer <harald@redhat.com>
Recently following patches have been added in upstream Linux kernel, which
(1) fixes parent of watchdog_device so that
/sys/class/watchdog/watchdogn/device is populated. (2) adds some sysfs
device attributes so that different watchdog status can be read.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6551881c86c791237a3bebf11eb3bd70b60ea782http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=906d7a5cfeda508e7361f021605579a00cd82815http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=33b711269ade3f6bc9d9d15e4343e6fa922d999b
With the above support, now we can find out whether a watchdog is active or
not. We can also find out the driver/module responsible for that watchdog
device.
Proposed patch uses above support and then adds module of active watchdog
in initramfs generated by dracut for hostonly mode. Kernel module for
inactive watchdog will be added as well for none hostonly mode.
When an user does not want to add kernel module, then one should exclude
complete dracut watchdog module with --omit.
Testing:
-- When watchdog is active watchdog modules were added
# cat /sys/class/watchdog/watchdog0/identity
iTCO_wdt
# cat /sys/class/watchdog/watchdog0/state
active
# dracut --hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img | grep iTCO
-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
-- When watchdog is inactive then watchdog modules were not added
# cat /sys/class/watchdog/watchdog0/state
inactive
# dracut --hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img | grep iTCO
-- When watchdog is inactive, but no hostonly mode, watchdog modules were added
# cat /sys/class/watchdog/watchdog0/state
inactive
# dracut --no-hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img | grep iTCO
-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
Signed-off-by: Pratyush Anand <panand@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Harald Hoyer <harald@redhat.com>
When systemd is present, let it manage watchdog feed.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Harald Hoyer <harald@redhat.com>
How to reproduce:
host# ./dracut.sh -o 'dracut-systemd systemd systemd-initrd' --local -f ./initramfs.img
host# qemu-system-x86_64 -initrd ./initramfs.img \
-append 'root=/dev/sda1 rd.cmdline=ask rd.hostonly=0' \
...
Enter additional kernel command line parameter (end with ctrl-d or .)
> rd.break
> .
...
There is no "Break before switch_root"
...
Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>
Handle module aliases correctly to not generate unbootable
initrds with different kernel versions when modules were renamed
or replaced.
Signed-off-by: Fabian Vogt <fvogt@suse.com>
* Multipath device names only start with the mpath-prefix if the option
use_userfriendly_names is set true in /etc/multipath.conf and if user
has not set any aliases in the said file. Thus the for-loop should go
through all files in /dev/mapper/, not just ones starting with 'mpath'
* Bash is perfectly capable to extend `/dev/mapper/*` notation without a
need to pass it to an external ls
* Changed the function to use a local variable $_dev instead of the
global $dev, which seemed to be the original intention as the local
_dev was defined but not used
crypt/parse-crypt.sh generate initqueue job which always call
dev_unit_name() with an argument beginning with "-". This results
in the following error:
dracut-initqueue[307]: + systemd-escape -p -cfb4aa43-2f02-4c6b-a313-60ea99288087
dracut-initqueue[307]: systemd-escape: invalid option -- 'c'
Add a systemd generator for root=nbd:.. so that systemd has a correct
sysroot.mount unit.
Use export names instead of port numbers, because port number based
exports are deprecated and were removed.
rename iface_has_link() to iface_has_carrier() to clarify usage
Only assign static "wildcard interface" settings, if the interface has a
carrier.
If the interface name was specified with a name, do not do carrier
checking for static configurations.
Harald Hoyer