Added a check for disk space..

Merge of master-melb:xfs-cmds:29995a by kenmcd.

  Check if there is enough disk space to run this test..

180

@@ -37,6 +37,11 @@ _require_scratch
 _scratch_mkfs_xfs >/dev/null 2>&1
 _scratch_mount
 
+# Do we have enough space on disk?
+FREE_BLOCKS=`df -kl $SCRATCH_MNT | grep -v Filesystem | awk '{print $4}'`
+[ $FREE_BLOCKS -lt 10485760 ] && _notrun "This test requires at least 10GB of \
+                                          $SCRATCH_DEV to run"
+
 _check_files()
 {
 	# check file size and contents