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kdumpctl: improve check_wdt_modified()

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Use the logic of dracut 04watchdog/module-setup.sh to check,
then we only need to compare the content of 00-watchdog.conf,
so we can save one operation of lsinitrd.

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
Acked-by: Pratyush Anand <panand@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
This commit is contained in:
Xunlei Pang 2017-05-04 14:56:55 +08:00 committed by Dave Young
parent c63c0a1084
commit 2a5f362521
1 changed files with 44 additions and 22 deletions
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66
kdumpctl
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@ -565,36 +565,58 @@ check_dump_fs_modified()
check_wdt_modified()
{
local -A _drivers
local _alldrivers _active _wdtdrv _wdtppath _dir
local wd_old wd_new
is_wdt_mod_omitted
[[ $? -eq 0 ]] && return 0
[[ -d /sys/class/watchdog/ ]] || return 0
for dir in /sys/class/watchdog/*; do
[[ -d "$dir" ]] || continue
[[ -f "$dir/state" ]] || continue
wdtdrv=$(< "$dir/device/modalias")
wdtdrv=$(modinfo $wdtdrv | grep filename | awk -F"kernel/" '{print $2}')
active=$(< "$dir/state")
# rebuild when:
# module for this watchdog is not found and watchdog is active
# module for this watchdog is found and watchdog is inactive
lsinitrd $TARGET_INITRD | grep $wdtdrv &> /dev/null
if [ $? -ne 0 ]; then
[[ "$active" = "active" ]] && return 1
else
[[ "$active" = "inactive" ]] && return 1
# Copied logic from dracut 04watchdog/module-setup.sh::installkernel()
for _dir in /sys/class/watchdog/*; do
[[ -d "$_dir" ]] || continue
[[ -f "$_dir/state" ]] || continue
_active=$(< "$_dir/state")
[[ "$_active" = "active" ]] || continue
# device/modalias will return driver of this device
_wdtdrv=$(< "$_dir/device/modalias")
# There can be more than one module represented by same
# modalias. Currently load all of them.
# TODO: Need to find a way to avoid any unwanted module
# represented by modalias
_wdtdrv=$(modprobe --set-version "$kdump_kver" -R $_wdtdrv 2>/dev/null)
if [[ $_wdtdrv ]]; then
for i in $_wdtdrv; do
_drivers[$i]=1
done
fi
# however in some cases, we also need to check that if there is
# a specific driver for the parent bus/device. In such cases
# we also need to enable driver for parent bus/device.
_wdtppath=$(readlink -f "$_dir/device")
while [[ -d "$_wdtppath" ]] && [[ "$_wdtppath" != "/sys" ]]; do
_wdtppath=$(readlink -f "$_wdtppath/..")
[[ -f "$_wdtppath/modalias" ]] || continue
_wdtdrv=$(< "$_wdtppath/modalias")
_wdtdrv=$(modprobe --set-version "$kdump_kver" -R $_wdtdrv 2>/dev/null)
if [[ $_wdtdrv ]]; then
for i in $_wdtdrv; do
_drivers[$i]=1
done
fi
done
# check if watchdog kernel module unloaded.
loaded_mods=$(lsinitrd $TARGET_INITRD -f etc/cmdline.d/00-watchdog.conf)
[[ -n $loaded_mods ]] && loaded_mods=$(echo $loaded_mods | awk -F"rd.driver.pre=" '{print $2}' | sed "s/,/ /g")
for mod in $loaded_mods ; do
lsmod | grep $mod &> /dev/null
[[ $? != 0 ]] && return 1
done
return 0
# ensure that watchdog module is loaded as early as possible
_alldrivers="${!_drivers[*]}"
[[ $_alldrivers ]] && wd_new="rd.driver.pre=${_alldrivers// /,}"
wd_old=$(lsinitrd $TARGET_INITRD -f etc/cmdline.d/00-watchdog.conf)
[[ "$wd_old" = "$wd_new" ]] && return 0
return 1
}
# returns 0 if system is not modified