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kdumpctl: remove "root=X" for kdump boot 

Since the current dracut of Fedora already supports not always
mounting root device, we can remove "root=X" from the command
line directly, and always get the dump target specified in
"/etc/kdump.conf" and mount it. If the dump target is located
at root filesystem, we will add the root mount info explicitly
from kdump side instead of from dracut side.

For example, in case of nfs/ssh/usb/raw/etc(non-root) dumping,
kdump will not mount the unnecessary root fs after this change.

This patch removes "root=X" via the "KDUMP_COMMANDLINE_REMOVE"
(if "default dump_to_rootfs" is specified, don't remove "root=X"),
and mounts non-root target under "/kdumproot", the root target
still under "/sysroot"(to be align with systemd sysroot.mount).

After removing "root=X", we now add root fs mount information
explicitly from the kdump side.

Changed check_dump_fs_modified() a little to avoid rebuild when
dump target is root, since we add root fs mount explicitly now.

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 2017-04-05 19:34:12 +08:00 committed by Dave Young
parent bf5b3da107
commit b40c1f96cf
3 changed files with 48 additions and 38 deletions
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26
dracut-module-setup.sh
View File

@ -390,20 +390,20 @@ default_dump_target_install_conf()
_save_path=$_mntpoint/$_save_path
fi
_fstype=$(get_fs_type_from_target $_target)
if is_fs_type_nfs $_fstype; then
kdump_install_net "$_target"
_fstype="nfs"
else
_target=$(kdump_get_persistent_dev $_target)
fi
echo "$_fstype $_target" >> ${initdir}/tmp/$$-kdump.conf
# strip the duplicated "/"
_save_path=$(echo $_save_path | tr -s /)
# don't touch the path under root mount
if [ "$_mntpoint" != "/" ]; then
_fstype=$(get_fs_type_from_target $_target)
if $(is_fs_type_nfs $_fstype); then
kdump_install_net "$_target"
_fstype="nfs"
else
_target=$(kdump_get_persistent_dev $_target)
fi
echo "$_fstype $_target" >> ${initdir}/tmp/$$-kdump.conf
# strip the duplicated "/"
_save_path=$(echo $_save_path | tr -s /)
_save_path=${_save_path##"$_mntpoint"}
fi

31
kdumpctl
View File

@ -171,6 +171,11 @@ check_kdump_cpus()
echo " try nr_cpus=$nr_min or larger instead"
}
is_dump_to_rootfs()
{
grep "^default[[:space:]]dump_to_rootfs" /etc/kdump.conf >/dev/null
}
# This function performs a series of edits on the command line.
# Store the final result in global $KDUMP_COMMANDLINE.
prepare_cmdline()
@ -192,6 +197,17 @@ prepare_cmdline()
# These params can be removed configurably
cmdline=`remove_cmdline_param "$cmdline" ${KDUMP_COMMANDLINE_REMOVE}`
# Always remove "root=X", as we now explicitly generate all kinds
# of dump target mount information including root fs. But we can
# not remove it in case of fadump or "default dump_to_rootfs".
#
# We do this before KDUMP_COMMANDLINE_APPEND, if one really cares
# about it(e.g. for debug purpose), then can pass "root=X" using
# KDUMP_COMMANDLINE_APPEND.
if [ $DEFAULT_DUMP_MODE != "fadump" ] && ! is_dump_to_rootfs; then
cmdline=`remove_cmdline_param "$cmdline" root`
fi
cmdline="${cmdline} ${KDUMP_COMMANDLINE_APPEND}"
id=`get_bootcpu_initial_apicid`
@ -512,11 +528,16 @@ check_dump_fs_modified()
fi
fi
if ! findmnt $_target >/dev/null; then
echo "Dump target $_target is probably not mounted."
return 2
fi
_new_mntpoint="/kdumproot/$(get_mntpoint_from_target $_target)"
if ! findmnt $_target >/dev/null; then
echo "Dump target $_target is probably not mounted."
return 2
fi
if [[ "$_target" = "$(get_root_fs_device)" ]]; then
_new_mntpoint="/sysroot"
else
_new_mntpoint="/kdumproot/$(get_mntpoint_from_target $_target)"
fi
_dracut_args=$(lsinitrd $TARGET_INITRD | grep "^Arguments:" | head -1)
if [[ -z "$_dracut_args" ]];then

29
mkdumprd
View File

@ -80,12 +80,6 @@ add_dracut_sshkey() {
add_dracut_arg "--sshkey" "$1"
}
target_is_root() {
local _t
_t=$(findmnt -k -n -r -o TARGET $1|sort|head -1)
[ "$_t" = "/" ]
}
# caller should ensure $1 is valid and mounted in 1st kernel
to_mount() {
local _dev=$1 _source _target _fstype _options _mntopts _pdev
@ -247,13 +241,13 @@ verify_core_collector() {
}
add_mount() {
if ! target_is_root "$1"; then
local _mnt=$(to_mount "$1")
if [ $? -ne 0 ]; then
exit 1
fi
add_dracut_mount "$_mnt"
local _mnt=$(to_mount "$1")
if [ $? -ne 0 ]; then
exit 1
fi
add_dracut_mount "$_mnt"
}
get_block_dump_target()
@ -274,7 +268,6 @@ handle_default_dump_target()
{
local _target
local _mntpoint
local _fstype
is_user_configured_dump_target && return
@ -293,13 +286,9 @@ handle_default_dump_target()
SAVE_PATH=$_mntpoint/$SAVE_PATH
fi
if [ "$_mntpoint" != "/" ]; then
SAVE_PATH=${SAVE_PATH##"$_mntpoint"}
_fstype=$(get_fs_type_from_target $_target)
add_mount "$_target"
check_size fs $_target
fi
SAVE_PATH=${SAVE_PATH##"$_mntpoint"}
add_mount "$_target"
check_size fs $_target
}
get_default_action_target()