90multipath: add shutdown script

As the device-mapper module is removing all device-mapper tables
during shutdown we need to make sure to disable queuing on the
multipath devices; otherwise there might still be I/O pending
and the removal will fail.

References: bsc#994860

Signed-off-by: Hannes Reinecke <hare@suse.com>

modules.d/90multipath/module-setup.sh

@@ -89,6 +89,7 @@ install() {
     fi
 
     inst_hook cleanup   80 "$moddir/multipathd-needshutdown.sh"
+    inst_hook shutdown  20 "$moddir/multipath-shutdown.sh"
 
     inst_rules 40-multipath.rules 56-multipath.rules \
 	62-multipath.rules 65-multipath.rules \

modules.d/90multipath/multipath-shutdown.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+for i in $(multipath -l -v1); do
+    if ! $(dmsetup table $i | sed -n '/.*queue_if_no_path.*/q1') ; then
+        dmsetup message $i 0 fail_if_no_path
+    fi
+done

modules.d/90multipath/multipathd-needshutdown.sh

@@ -1,7 +1,8 @@
 #!/bin/sh
 
-for i in /dev/mapper/mpath*; do
-    [ -b "$i" ] || continue
+for i in $(multipath -l -v1); do
+    if $(dmsetup table $i | sed -n '/.*queue_if_no_path.*/q1') ; then
         need_shutdown
         break
+    fi
 done