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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: Tue, 16 Jun 2020 16:25:34 -0500
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Subject: [PATCH] multipath: delegate flushing maps to multipathd
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Since there can be problems with removing maps outside of multipathd,
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multipath should attempt to delegate this command to multipathd.
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However, multipathd doesn't attempt to suspend the device, in order
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to avoid potential hangs. If delegating to multipathd fails, multipath
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should try the remove itself.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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multipath/main.c | 14 ++++++++++++++
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multipath/multipath.8 | 4 ++--
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2 files changed, 16 insertions(+), 2 deletions(-)
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diff --git a/multipath/main.c b/multipath/main.c
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index a2080029..612c6815 100644
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--- a/multipath/main.c
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+++ b/multipath/main.c
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@@ -828,6 +828,20 @@ int delegate_to_multipathd(enum mpath_cmds cmd,
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if (cmd == CMD_CREATE && conf->force_reload == FORCE_RELOAD_YES) {
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p += snprintf(p, n, "reconfigure");
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}
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+ else if (cmd == CMD_FLUSH_ONE && dev && dev_type == DEV_DEVMAP) {
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+ p += snprintf(p, n, "del map %s", dev);
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+ /* multipathd doesn't try as hard, to avoid potentially
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+ * hanging. If it fails, retry with the regular multipath
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+ * command */
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+ r = NOT_DELEGATED;
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+ }
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+ else if (cmd == CMD_FLUSH_ALL) {
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+ p += snprintf(p, n, "del maps");
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+ /* multipathd doesn't try as hard, to avoid potentially
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+ * hanging. If it fails, retry with the regular multipath
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+ * command */
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+ r = NOT_DELEGATED;
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+ }
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/* Add other translations here */
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if (strlen(command) == 0)
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diff --git a/multipath/multipath.8 b/multipath/multipath.8
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index 8befc45a..47a33f9b 100644
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--- a/multipath/multipath.8
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+++ b/multipath/multipath.8
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@@ -125,11 +125,11 @@ the system.
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Other operation modes are chosen by using one of the following command line switches:
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.TP
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.B \-f
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-Flush (remove) a multipath device map specified as parameter, if unused.
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+Flush (remove) a multipath device map specified as parameter, if unused. This operation is delegated to the multipathd daemon if it's running.
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.
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.TP
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.B \-F
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-Flush (remove) all unused multipath device maps.
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+Flush (remove) all unused multipath device maps. This operation is delegated to the multipathd daemon if it's running.
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.
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.TP
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.B \-l
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--
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2.17.2
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