91 lines
2.6 KiB
Diff
91 lines
2.6 KiB
Diff
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From 77403e0032c0ca8bcd4c3951e3ead3bd8c23f8e6 Mon Sep 17 00:00:00 2001
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From: Dave Young <dyoung@redhat.com>
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Date: Mon, 6 Jul 2015 15:31:26 +0800
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Subject: [PATCH] 90multipath: add hostonly multipath.conf in case hostonly
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mode
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For large machine, suppose there's a lot of multipath devices, multipath layer
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will use a lot of memory. For kdump kernel memory is very limited thus it causes
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oom. To avoid oom, we only add necessary multipath devices in kdump kernel
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multipath.conf.
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This is done by use mpathconf --allow, a new option which is like whitelist.
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Signed-off-by: Dave Young <dyoung@redhat.com>
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---
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modules.d/90multipath/module-setup.sh | 42 ++++++++++++++++++++++++++++-------
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1 file changed, 34 insertions(+), 8 deletions(-)
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diff --git a/modules.d/90multipath/module-setup.sh b/modules.d/90multipath/module-setup.sh
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index 29643d4..321f13e 100755
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--- a/modules.d/90multipath/module-setup.sh
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+++ b/modules.d/90multipath/module-setup.sh
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@@ -1,18 +1,28 @@
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#!/bin/bash
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+is_mpath() {
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+ local _dev=$1
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+ [ -e /sys/dev/block/$_dev/dm/uuid ] || return 1
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+ [[ $(cat /sys/dev/block/$_dev/dm/uuid) =~ mpath- ]] && return 0
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+ return 1
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+}
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+
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+majmin_to_mpath_dev() {
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+ local _dev
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+ for i in `ls -1 /dev/mapper/mpath*`; do
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+ dev=$(get_maj_min $i)
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+ if [ "$dev" = "$1" ]; then
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+ echo $i
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+ return
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+ fi
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+ done
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+}
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# called by dracut
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check() {
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local _rootdev
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# if there's no multipath binary, no go.
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require_binaries multipath || return 1
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- is_mpath() {
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- local _dev=$1
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- [ -e /sys/dev/block/$_dev/dm/uuid ] || return 1
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- [[ $(cat /sys/dev/block/$_dev/dm/uuid) =~ mpath- ]] && return 0
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- return 1
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- }
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-
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[[ $hostonly ]] || [[ $mount_needs ]] && {
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for_each_host_dev_and_slaves is_mpath || return 255
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}
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@@ -79,7 +89,18 @@ installkernel() {
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# called by dracut
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install() {
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- local _f
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+ local _f _allow
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+ add_hostonly_mpath_conf() {
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+ is_mpath $1 && {
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+ local _dev
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+
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+ _dev=$(majmin_to_mpath_dev $1)
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+ [ -z "$_dev" ] && return
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+ strstr "$_allow" "$_dev" && return
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+ _allow="$_allow --allow $_dev"
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+ }
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+ }
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+
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inst_multiple -o \
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dmsetup \
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kpartx \
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@@ -93,6 +114,11 @@ install() {
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/etc/multipath.conf \
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/etc/multipath/*
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+ [[ $hostonly ]] && {
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+ for_each_host_dev_and_slaves_all add_hostonly_mpath_conf
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+ [ -n "$_allow" ] && mpathconf $_allow --outfile ${initdir}/etc/multipath.conf
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+ }
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+
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inst $(command -v partx) /sbin/partx
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inst_libdir_file "libmultipath*" "multipath/*"
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