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_fallocate_zero_end(tmpdir, mode):
path = str(tmpdir.join("file"))
with open(path, "wb") as f:
f.write(b"x" * BLOCKSIZE * 3)
buf = util.aligned_buffer(BLOCKSIZE * 3)
with closing(buf), util.open(path, "r+") as f:
try_fallocate(f.fileno(), mode, BLOCKSIZE * 2, BLOCKSIZE)
n = f.readinto(buf)
assert n == BLOCKSIZE * 3
assert buf[:-BLOCKSIZE] == b"x" * BLOCKSIZE * 2
assert buf[-BLOCKSIZE:] == b"\0" * BLOCKSIZE
assert f.readinto(buf) == 0
def loop_device(tmpdir):
backing_file = str(tmpdir.join("backing_file"))
with util.open(backing_file, "w") as f:
buf = util.aligned_buffer(BLOCKSIZE * 3)
with closing(buf):
buf[:] = b"x" * BLOCKSIZE * 3
f.write(buf)
out = subprocess.check_output(
["losetup", "--find", backing_file, "--show"])
try:
loop = out.strip().decode("ascii")
yield loop
finally:
subprocess.check_call(["losetup", "--detach", loop])
def test_fallocate_punch_hole_after_end(tmpdir):
path = str(tmpdir.join("file"))
with open(path, "wb") as f:
f.write(b"x" * BLOCKSIZE * 3)
buf = util.aligned_buffer(BLOCKSIZE * 3)
with closing(buf), util.open(path, "r+") as f:
# This does not change file contents or size.
mode = ioutil.FALLOC_FL_PUNCH_HOLE | ioutil.FALLOC_FL_KEEP_SIZE
try_fallocate(f.fileno(), mode, BLOCKSIZE * 3, BLOCKSIZE)
n = f.readinto(buf)
assert n == BLOCKSIZE * 3
assert buf[:] == b"x" * BLOCKSIZE * 3
assert f.readinto(buf) == 0
def test_fallocate_zero_after_end(tmpdir):
path = str(tmpdir.join("file"))
with open(path, "wb") as f:
f.write(b"x" * BLOCKSIZE * 3)
buf = util.aligned_buffer(BLOCKSIZE * 4)
with closing(buf), util.open(path, "r+") as f:
# Will allocate more space that will return zeros when read.
mode = ioutil.FALLOC_FL_ZERO_RANGE
try_fallocate(f.fileno(), mode, BLOCKSIZE * 3, BLOCKSIZE)
n = f.readinto(buf)
assert n == BLOCKSIZE * 4
assert buf[:-BLOCKSIZE] == b"x" * BLOCKSIZE * 3
assert buf[-BLOCKSIZE:] == b"\0" * BLOCKSIZE
assert f.readinto(buf) == 0
def test_blksszget_512(loop_device):
with util.open(loop_device, "r+") as f:
assert ioutil.blksszget(f.fileno()) == 512