This test is a stress test. It creates a set of threads for coping small files
into disk. I use a 2G disk for test, the ENOSPC arises usually but the disk is
not full under kenerl 3.0 with intel64.
Signed-off-by: Wu Bo <Wu.Bo@cn.fujitsu.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>