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From 3f297c1b3bebcb8812db882f369fbb4c43f4ceb3 Mon Sep 17 00:00:00 2001
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From: David Teigland <teigland@redhat.com>
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Date: Mon, 25 Jul 2022 13:50:43 -0500
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Subject: [PATCH] apply multipath_component_detection=0 to duplicate PV
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handling
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multipath_component_detection=0 has always applied to the filter-based
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component detection. Also apply this setting to the duplicate-PV
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handling which also eliminates multipath components (based on duplicate
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PVs having the same wwid.)
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(cherry picked from commit 99ce09ae778c2cc4aa2611e425bba5287b8b9513)
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---
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lib/cache/lvmcache.c | 3 +++
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test/shell/duplicate-pvs-multipath.sh | 10 +++++++---
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2 files changed, 10 insertions(+), 3 deletions(-)
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diff --git a/lib/cache/lvmcache.c b/lib/cache/lvmcache.c
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index 61a2fee6d..04e9f0605 100644
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--- a/lib/cache/lvmcache.c
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+++ b/lib/cache/lvmcache.c
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@@ -640,6 +640,9 @@ static int _all_multipath_components(struct cmd_context *cmd, struct lvmcache_in
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*dev_mpath = NULL;
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+ if (!find_config_tree_bool(cmd, devices_multipath_component_detection_CFG, NULL))
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+ return 0;
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+
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/* This function only makes sense with more than one dev. */
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if ((info && dm_list_empty(altdevs)) || (!info && (dm_list_size(altdevs) == 1))) {
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log_debug("Skip multipath component checks with single device for PVID %s", pvid);
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diff --git a/test/shell/duplicate-pvs-multipath.sh b/test/shell/duplicate-pvs-multipath.sh
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index 59c15b0d4..bc98d2d5a 100644
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--- a/test/shell/duplicate-pvs-multipath.sh
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+++ b/test/shell/duplicate-pvs-multipath.sh
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@@ -24,9 +24,13 @@ modprobe --dry-run scsi_debug || skip
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multipath -l || skip
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multipath -l | grep scsi_debug && skip
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-# Turn off multipath_component_detection so that the duplicate
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-# resolution of mpath components is used.
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-aux lvmconf 'devices/multipath_component_detection = 0'
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+# FIXME: setting multipath_component_detection=0 now also disables
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+# the wwid-based mpath component detection, so this test will need
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+# to find another way to disable only the filter-mpath code (using
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+# sysfs and multipath/wwids) while keeping the code enabled that
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+# eliminates duplicates based on their matching wwids which this
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+# tries to test.
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+
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# Prevent wwids from being used for filtering.
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aux lvmconf 'devices/multipath_wwids_file = "/dev/null"'
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# Need to use /dev/mapper/mpath
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--
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2.37.1
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