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From 15384bcedb8002440e1327e97cd9c139af8a32dd Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Mon, 15 Jan 2018 15:44:46 +0100
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Subject: [PATCH] dracut-functions.sh:check_vol_slaves() speedup LV -> VG name
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Instead of trying all /dev/mapper/* devices to match the maj:min, and
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get the VG name with "lvm lvs", use the dm/name from /sys and dmsetup
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splitname.
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This should speedup execution with lots of LVs.
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Cherry-picked from: 9ed6eb741
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Resolves: #1531503
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---
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dracut-functions.sh | 62 +++++++++++++++++++++------------------------
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1 file changed, 29 insertions(+), 33 deletions(-)
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diff --git a/dracut-functions.sh b/dracut-functions.sh
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index ca54bd7f..53289ca0 100755
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--- a/dracut-functions.sh
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+++ b/dracut-functions.sh
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@@ -687,43 +687,39 @@ for_each_host_dev_and_slaves()
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# but you cannot create the logical volume without the volume group.
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# And the volume group might be bigger than the devices the LV needs.
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check_vol_slaves() {
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- local _lv _vg _pv
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- for i in /dev/mapper/*; do
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- [[ $i == /dev/mapper/control ]] && continue
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- _lv=$(get_maj_min $i)
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- if [[ $_lv = $2 ]]; then
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- _vg=$(lvm lvs --noheadings -o vg_name $i 2>/dev/null)
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- # strip space
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- _vg="${_vg//[[:space:]]/}"
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- if [[ $_vg ]]; then
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- for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2>/dev/null)
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- do
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- check_block_and_slaves $1 $(get_maj_min $_pv) && return 0
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- done
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- fi
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- fi
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- done
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+ local _lv _vg _pv _dm _majmin
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+ _majmin="$2"
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+ _lv="/dev/block/$_majmin"
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+ _dm=/sys/dev/block/$_majmin/dm
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+ [[ -f $_dm/uuid && $(<$_dm/uuid) =~ LVM-* ]] || return 1
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+ _vg=$(dmsetup splitname --noheadings -o vg_name $(<"$_dm/name") )
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+ # strip space
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+ _vg="${_vg//[[:space:]]/}"
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+ if [[ $_vg ]]; then
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+ for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2>/dev/null)
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+ do
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+ check_block_and_slaves $1 $(get_maj_min $_pv) && return 0
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+ done
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+ fi
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return 1
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}
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check_vol_slaves_all() {
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- local _lv _vg _pv
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- for i in /dev/mapper/*; do
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- [[ $i == /dev/mapper/control ]] && continue
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- _lv=$(get_maj_min $i)
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- if [[ $_lv = $2 ]]; then
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- _vg=$(lvm lvs --noheadings -o vg_name $i 2>/dev/null)
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- # strip space
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- _vg="${_vg//[[:space:]]/}"
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- if [[ $_vg ]]; then
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- for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2>/dev/null)
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- do
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- check_block_and_slaves_all $1 $(get_maj_min $_pv)
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- done
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- return 0
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- fi
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- fi
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- done
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+ local _lv _vg _pv _majmin
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+ _majmin="$2"
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+ _lv="/dev/block/$_majmin"
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+ _dm="/sys/dev/block/$_majmin/dm"
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+ [[ -f $_dm/uuid && $(<$_dm/uuid) =~ LVM-* ]] || return 1
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+ _vg=$(dmsetup splitname --noheadings -o vg_name $(<"$_dm/name") )
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+ # strip space
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+ _vg="${_vg//[[:space:]]/}"
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+ if [[ $_vg ]]; then
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+ for _pv in $(lvm vgs --noheadings -o pv_name "$_vg" 2>/dev/null)
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+ do
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+ check_block_and_slaves_all $1 $(get_maj_min $_pv)
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+ done
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+ return 0
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+ fi
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return 1
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}
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