Ensure we do not oversubscribe freespace for AIO stress test.

Merge of master-melb:xfs-cmds:21491a by kenmcd.

113

@@ -49,9 +49,6 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 _cleanup()
 {
     cd /
-    # we might get here with a RO FS
-    mount -o remount,rw $TEST_DEV >/dev/null 2>&1
-    # now kill!
     rm -f $testdir/aio-stress.$$.*
     _cleanup_testdir
 }
@@ -85,9 +82,11 @@ _do_test()
         echo "    aio-stress (count=$_count) returned $?"
         cat $tmp.out
         status=1
+        exit
     fi
 
     _check_test_fs
+    rm -f $_files
 }
 
 
@@ -106,12 +105,12 @@ procs=20
 _check_test_fs
 
 # the default
-_do_test 1 "" $count 1
+_do_test 1 "-I120m" $count 1
 
 # and the default with multiprocess
-_do_test 2 "" $count $procs
+_do_test 2 "-I10m" $count $procs
 
 # as above, but now using direct IO
-_do_test 3 "-O" $count $procs
+_do_test 3 "-I10m -O" $count $procs
 
 exit