From: "Marappan, Gopinath" <Gopinath.Marappan@dell.com>
To: "linux-lvm@redhat.com" <linux-lvm@redhat.com>
Cc: "parakunnath, remesh" <Remesh.Parakunnath@dell.com>,
"Rajappa, Ajaykumar" <Ajaykumar.Rajappa@Dell.com>,
"Tarikere, Madhu" <Madhu.Tarikere@dell.com>
Subject: [linux-lvm] Fix for Bug 2109351 - multipath_component_detection = 0 in lvm.conf does not have any effect
Date: Thu, 21 Jul 2022 06:52:09 +0000 [thread overview]
Message-ID: <DM6PR19MB249191C1C763815BDDFE998588919@DM6PR19MB2491.namprd19.prod.outlook.com> (raw)
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Regarding a fix for this bug - https://bugzilla.redhat.com/show_bug.cgi?id=2109351
multipath_component_detection parameter is not considered when lvm scans for PVs.
This patch should fix that issue. It ensures that the multipath_component_detction parameter
from lvm.conf is considered before checking for duplicated PVIDs and ignoring them if they are
multipath components.
I have built the patch and verified that it works.
diff --git a/lib/cache/lvmcache.c b/lib/cache/lvmcache.c
index 22edcfd84..892636aa7 100644
--- a/lib/cache/lvmcache.c
+++ b/lib/cache/lvmcache.c
@@ -898,7 +898,8 @@ next:
/*
* Get rid of multipath components based on matching wwids.
*/
- if (_all_multipath_components(cmd, info, pvid, &altdevs, &dev_mpath)) {
+ if ( find_config_tree_bool(cmd, devices_multipath_component_detection_CFG, NULL) &&
+ _all_multipath_components(cmd, info, pvid, &altdevs, &dev_mpath) ){
if (info && dev_mpath && (info->dev != dev_mpath)) {
/*
* info should be dropped from lvmcache and info->dev
I tried to create a pull request on https://github.com/lvmteam/lvm2, but I couldn't as I don't have access.
If I am granted access to the lvm2 github repo, I can create a PR for this patch.
Kindly let me know how to proceed with this.
Thanks,
Gopi
Internal Use - Confidential
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