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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Fri, 11 Feb 2022 17:23:39 -0600
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Subject: [PATCH] multipathd: disallow changing to/from fpin marginal paths on
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reconfig
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Setting marginal_pathgroups to fpin causes two new threads to be created
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when multipathd starts. Turning it on after multipathd starts up won't
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cause the theads to start, and turing it off won't keep the threads from
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working. So disallow changing marginal_pathgroups to/from "fpin" on
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reconfigure.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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multipath/multipath.conf.5 | 13 ++++++++-----
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multipathd/main.c | 9 +++++++++
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2 files changed, 17 insertions(+), 5 deletions(-)
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diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
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index 805b7a5e..8e418372 100644
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--- a/multipath/multipath.conf.5
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+++ b/multipath/multipath.conf.5
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@@ -1077,15 +1077,18 @@ have been tried first. This prevents the possibility of IO errors occuring
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while marginal paths are still usable. After the path has been monitored
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for the configured time, and is declared healthy, it will be returned to its
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normal pathgroup.
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-However if this option is set to \fIfpin\fR multipathd will receive fpin
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+If this option is set to \fIfpin\fR, multipathd will receive fpin
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notifications, set path states to "marginal" accordingly, and regroup paths
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-as described for "marginal_pathgroups yes". This option can't be used in combination
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-with other options for "Shaky path detection" (see below).If it is set to fpin,
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-marginal_path_xyz and san_path_err_xyz parameters are implicitly set to 0.
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+as described for \fIon\fR. This option can't be used in combination
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+with other options for "Shaky path detection" (see below). \fBNote:\fR If this
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+is set to \fIfpin\fR, the \fImarginal_path_*\fR and \fIsan_path_err_*\fR
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+options are implicitly set to \fIno\fP. Also, this option cannot be switched
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+either to or from \fIfpin\fR on a multipathd reconfigure. multipathd must be
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+restarted for the change to take effect.
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See "Shaky paths detection" below for more information.
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.RS
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.TP
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-The default is: \fBno\fR
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+The default is: \fBoff\fR
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.RE
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.
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.
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diff --git a/multipathd/main.c b/multipathd/main.c
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index 4cf5bc41..a6ffbe32 100644
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--- a/multipathd/main.c
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+++ b/multipathd/main.c
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@@ -2675,6 +2675,7 @@ int
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reconfigure (struct vectors * vecs)
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{
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struct config * old, *conf;
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+ int old_marginal_pathgroups;
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conf = load_config(DEFAULT_CONFIGFILE);
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if (!conf)
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@@ -2702,6 +2703,14 @@ reconfigure (struct vectors * vecs)
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uxsock_timeout = conf->uxsock_timeout;
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old = rcu_dereference(multipath_conf);
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+ old_marginal_pathgroups = old->marginal_pathgroups;
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+ if ((old_marginal_pathgroups == MARGINAL_PATHGROUP_FPIN) !=
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+ (conf->marginal_pathgroups == MARGINAL_PATHGROUP_FPIN)) {
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+ condlog(1, "multipathd must be restarted to turn %s fpin marginal paths",
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+ (old_marginal_pathgroups == MARGINAL_PATHGROUP_FPIN)?
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+ "off" : "on");
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+ conf->marginal_pathgroups = old_marginal_pathgroups;
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+ }
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conf->sequence_nr = old->sequence_nr + 1;
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rcu_assign_pointer(multipath_conf, conf);
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call_rcu(&old->rcu, rcu_free_config);
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