Adding NFS Stale Handle Check and XFS Reflinks

A couple new schnippets for the collection.

check_nfs.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+while read _ _ mount _; do
+  read -t1 < <(stat -t "$mount") || echo "$(date) ${mount} timeout $(lsof -b 2>/dev/null | grep "${mount}")";
+done < <(mount -t nfs) >> /var/log/nfs.err

xfs_reflinks.sh

@@ -0,0 +1 @@
+mkfs.xfs -m reflink=1 /dev/sdXX