def test_zeroout_end(loop_device):
with util.open(loop_device, "r+") as f:
ioutil.blkzeroout(f.fileno(), BLOCKSIZE * 2, BLOCKSIZE)
with util.open(loop_device, "r") as f:
buf = util.aligned_buffer(BLOCKSIZE * 3)
with closing(buf):
f.readinto(buf)
assert buf[:-BLOCKSIZE] == b"x" * BLOCKSIZE * 2
assert buf[-BLOCKSIZE:] == b"\0" * BLOCKSIZE
def test_zeroout_end(loop_device):
with util.open(loop_device, "r+") as f:
ioutil.blkzeroout(f.fileno(), BLOCKSIZE * 2, BLOCKSIZE)
with util.open(loop_device, "r") as f:
buf = util.aligned_buffer(BLOCKSIZE * 3)
with closing(buf):
f.readinto(buf)
assert buf[:-BLOCKSIZE] == b"x" * BLOCKSIZE * 2
assert buf[-BLOCKSIZE:] == b"\0" * BLOCKSIZE
def test_zeroout_start(loop_device):
with directio.open(loop_device, "r+") as f:
ioutil.blkzeroout(f.fileno(), 0, BLOCKSIZE)
with directio.open(loop_device, "r") as f:
buf = directio.aligned_buffer(BLOCKSIZE * 3)
with closing(buf):
f.readinto(buf)
assert buf[:BLOCKSIZE] == b"\0" * BLOCKSIZE
assert buf[BLOCKSIZE:] == b"x" * BLOCKSIZE * 2