def test_clone(user_file):
size = user_file.sector_size * 2
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
with file.open(user_file.url, "r+", sparse=True) as a, \
a.clone() as b, \
util.aligned_buffer(user_file.sector_size) as buf:
# Backends are identical when created.
assert a.size() == b.size()
assert a.tell() == b.tell()
assert a.block_size == b.block_size
# Operations on one backend do not affect the other.
buf[:] = b"y" * len(buf)
a.write(buf)
assert a.tell() == len(buf)
assert b.tell() == 0
# But both expose the same file contents.
buf[:] = b"\0" * len(buf)
b.readinto(buf)
assert buf[:] == b"y" * len(buf)
def test_zero_sparse_deallocate_space(user_file):
size = 1024**2
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
with file.open(user_file.url, "r+", sparse=True) as f:
f.zero(size)
assert os.stat(user_file.path).st_blocks * 512 < size
def test_open_read_only(user_file):
with io.open(user_file.path, "wb") as f:
f.write(b"x" * user_file.sector_size)
with file.open(user_file.url) as f, \
closing(util.aligned_buffer(user_file.sector_size)) as buf:
assert f.readable()
assert not f.writable()
f.readinto(buf)
assert buf[:] == b"x" * user_file.sector_size
def test_readinto(user_file):
with io.open(user_file.path, "wb") as f:
f.write(b"a" * 4096)
with file.open(user_file.url) as f, \
closing(util.aligned_buffer(4096)) as buf:
n = f.readinto(buf)
assert n == len(buf)
assert f.tell() == len(buf)
assert buf[:] == b"a" * 4096
def test_block_size_allocated(user_file, size):
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
with file.open(user_file.url) as f:
assert f.block_size == user_file.sector_size
with io.open(user_file.path, "rb") as f:
assert f.read() == b"x" * size
def test_extents(user_file):
size = user_file.sector_size * 2
with io.open(user_file.path, "wb") as f:
f.truncate(size)
with file.open(user_file.url, "r+", sparse=True) as f:
# We support detecting extents now; empty file reports one data
# extents.
assert list(f.extents()) == [extent.ZeroExtent(0, size, False, False)]
def test_write_unbuffered_stream_partial_content(user_file):
chunks = [b"a" * 8192, b"b" * 42, b"c" * (8192 - 42)]
src = util.UnbufferedStream(chunks)
size = sum(len(c) for c in chunks)
with file.open(user_file.url, "r+") as dst, \
util.aligned_buffer(1024**2) as buf:
op = ops.Write(dst, src, buf, size + 1)
with pytest.raises(errors.PartialContent):
op.run()
def test_zero_aligned_after_end(user_file, sparse):
with io.open(user_file.path, "wb") as f:
f.write(b"x" * 4096)
with file.open(user_file.url, "r+", sparse=sparse) as f:
f.seek(8192)
n = f.zero(4096)
assert n == 4096
assert f.tell() == 12288
with io.open(user_file.path, "rb") as f:
assert f.read(4096) == b"x" * 4096
assert f.read() == b"\0" * 8192
def test_zero_aligned_middle(user_file, sparse):
with io.open(user_file.path, "wb") as f:
f.write(b"x" * 3 * 4096)
with file.open(user_file.url, "r+", sparse=sparse) as f:
f.seek(4096)
n = f.zero(4096)
assert n == 4096
assert f.tell() == 8192
with io.open(user_file.path, "rb") as f:
assert f.read(4096) == b"x" * 4096
assert f.read(4096) == b"\0" * 4096
assert f.read() == b"x" * 4096
def test_block_size_sparse(user_file, size):
with io.open(user_file.path, "wb") as f:
f.truncate(size)
with file.open(user_file.url) as f:
if user_file.can_detect_sector_size:
assert f.block_size == user_file.sector_size
else:
assert f.block_size in (user_file.sector_size, 4096)
with io.open(user_file.path, "rb") as f:
assert f.read(size) == b"\0" * size
def test_flush(user_file, monkeypatch):
count = [0]
def fsync(fd):
count[0] += 1
# This is ugly but probably the only way to test that we call fsync.
monkeypatch.setattr(os, "fsync", fsync)
with file.open(user_file.url, "r+") as f:
f.write(b"x")
f.flush()
assert count[0] == 1
def test_write_partial_content(user_file, offset, size):
with io.open(user_file.path, "wb") as f:
f.truncate(size + offset)
src = io.BytesIO(b"x" * (size - 1))
with file.open(user_file.url, "r+") as dst, \
util.aligned_buffer(1024**2) as buf:
op = ops.Write(dst, src, buf, size, offset=offset)
with pytest.raises(errors.PartialContent) as e:
op.run()
assert e.value.requested == size
assert e.value.available == size - 1
def test_open_read_write(user_file):
with io.open(user_file.path, "wb") as f:
f.write(b"a" * user_file.sector_size)
with file.open(user_file.url, "r+") as f, \
closing(util.aligned_buffer(user_file.sector_size)) as buf:
assert f.readable()
assert f.writable()
f.readinto(buf)
buf[:] = b"b" * user_file.sector_size
f.seek(0)
f.write(buf)
with io.open(user_file.path, "rb") as f:
assert f.read() == b"b" * user_file.sector_size
def test_read_partial_content(user_file, offset, size):
with io.open(user_file.path, "wb") as f:
f.truncate(offset + size - 1)
dst = io.BytesIO()
with file.open(user_file.url, "r") as src, \
util.aligned_buffer(1024**2) as buf:
op = ops.Read(src, dst, buf, size, offset=offset)
with pytest.raises(errors.PartialContent) as e:
op.run()
assert e.value.requested == size
assert e.value.available == size - 1
def test_write_aligned_at_end(user_file):
with io.open(user_file.path, "wb") as f:
f.write(b"a" * 8192)
with file.open(user_file.url, "r+") as f, \
closing(util.aligned_buffer(8192)) as buf:
buf.write(b"b" * 8192)
f.seek(4096)
n = f.write(buf)
assert n == len(buf)
assert f.tell() == 4096 + len(buf)
with io.open(user_file.path, "rb") as f:
assert f.read(4096) == b"a" * 4096
assert f.read() == b"b" * 8192
def test_write_unbuffered_stream(user_file):
chunks = [b"a" * 8192, b"b" * 42, b"c" * (8192 - 42)]
src = util.UnbufferedStream(chunks)
size = sum(len(c) for c in chunks)
with file.open(user_file.url, "r+") as dst, \
util.aligned_buffer(1024**2) as buf:
op = ops.Write(dst, src, buf, size)
op.run()
with io.open(user_file.path, "rb") as f:
for c in chunks:
assert f.read(len(c)) == c
assert f.read() == b""
def test_readinto_short_unaligned(user_file):
size = 42
buf_size = user_file.sector_size
with io.open(user_file.path, "wb") as f:
f.write(b"a" * size)
with file.open(user_file.url) as f, \
closing(util.aligned_buffer(buf_size)) as buf:
n = f.readinto(buf)
assert n == size
assert f.tell() == size
assert buf[:size] == b"a" * size
assert buf[size:] == b"\0" * (buf_size - size)
def test_block_size_preallocated(user_file, size):
# This is how vdsm preallocates volumes. This uses fallocate() or fallback
# to writing one byte per block.
subprocess.check_output(
["fallocate", "--posix", "--length",
str(size), user_file.path])
with file.open(user_file.url) as f:
if user_file.can_detect_sector_size:
assert f.block_size == user_file.sector_size
else:
assert f.block_size in (user_file.sector_size, 4096)
with io.open(user_file.path, "rb") as f:
assert f.read(size) == b"\0" * size
def test_read_full(user_file, offset, size, trailer):
data = b"b" * size
with io.open(user_file.path, "wb") as f:
f.write(b"a" * offset)
f.write(data)
f.write(b"c" * trailer)
dst = io.BytesIO()
with file.open(user_file.url, "r") as src, \
util.aligned_buffer(1024**2) as buf:
op = ops.Read(src, dst, buf, size, offset=offset)
op.run()
assert dst.getvalue() == data
def test_size(user_file):
size = 4096
with io.open(user_file.path, "wb") as f:
f.truncate(size)
with file.open(user_file.url, "r+", sparse=True) as f:
# Check initial size.
f.seek(100)
assert f.size() == size
assert f.tell() == 100
# Check that size() updates when file size is modified.
f.seek(size)
f.zero(4096)
assert f.size() == 8192
def test_zero_unaligned_offset_after_end(user_file):
size = user_file.sector_size
start = size + 10
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
with file.open(user_file.url, "r+") as f:
f.seek(start)
n = f.zero(10)
assert n == 10
assert f.tell() == start + 10
with io.open(user_file.path, "rb") as f:
assert f.read(size) == b"x" * size
assert f.read() == b"\0" * user_file.sector_size
def test_write_unaligned_offset_after_end(user_file):
size = user_file.sector_size
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
with file.open(user_file.url, "r+") as f:
f.seek(size + 10)
n = f.write(b"y" * 10)
assert n == 10
assert f.tell() == size + 20
with io.open(user_file.path, "rb") as f:
assert f.read(size) == b"x" * size
assert f.read(10) == b"\0" * 10
assert f.read(10) == b"y" * 10
assert f.read() == b"\0" * (user_file.sector_size - 20)
def test_zero_unaligned_offset_at_end(user_file):
size = user_file.sector_size * 2
start = size - 10
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
# Zero 10 bytes into the last block.
with file.open(user_file.url, "r+") as f:
f.seek(start)
n = f.zero(100)
assert n == 10
assert f.tell() == size
with io.open(user_file.path, "rb") as f:
assert f.read(start) == b"x" * start
assert f.read() == b"\0" * 10
def test_write_unaligned_offset_at_end(user_file):
size = user_file.sector_size * 2
start = size - 24
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
# Write 24 bytes into the last block.
with file.open(user_file.url, "r+") as f:
f.seek(size - 24)
n = f.write(b"y" * 100)
assert n == 24
assert f.tell() == size
with io.open(user_file.path, "rb") as f:
assert f.read(start) == b"x" * start
assert f.read() == b"y" * 24
def test_write_unaligned_buffer_slow_path(user_file):
size = user_file.sector_size * 2
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
# Perform slow read-modify-write in the second block.
with file.open(user_file.url, "r+") as f:
f.seek(user_file.sector_size)
n = f.write(b"y" * 10)
assert n == 10
assert f.tell() == user_file.sector_size + 10
with io.open(user_file.path, "rb") as f:
assert f.read(user_file.sector_size) == b"x" * user_file.sector_size
assert f.read(10) == b"y" * 10
assert f.read() == b"x" * (user_file.sector_size - 10)
def test_write_no_size(user_file, offset, size):
with io.open(user_file.path, "wb") as f:
f.truncate(offset + size)
src = io.BytesIO(b"x" * size)
with file.open(user_file.url, "r+") as dst, \
util.aligned_buffer(1024**2) as buf:
op = ops.Write(dst, src, buf, offset=offset)
op.run()
with io.open(user_file.path, "rb") as f:
assert f.read(offset) == b"\0" * offset
assert f.read(size) == src.getvalue()
file_size = os.path.getsize(user_file.path)
trailer = file_size - offset - size
assert file_size % user_file.sector_size == 0
assert f.read() == b"\0" * trailer
def test_block_size_first_block_unallocated(user_file):
# Assumes file system block size <= 4096.
hole_size = 4096
data_size = 4096
with io.open(user_file.path, "wb") as f:
f.seek(hole_size)
f.write(b"x" * data_size)
with file.open(user_file.url) as f:
if user_file.can_detect_sector_size:
assert f.block_size == user_file.sector_size
else:
assert f.block_size in (user_file.sector_size, 4096)
with io.open(user_file.path, "rb") as f:
assert f.read(hole_size) == b"\0" * hole_size
assert f.read(data_size) == b"x" * data_size
def test_write_unaligned_offset_inside(user_file):
size = user_file.sector_size * 2
start = user_file.sector_size - 12
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
# Write 12 bytes into the first block.
with file.open(user_file.url, "r+") as f:
f.seek(start)
n = f.write(b"y" * 100)
assert n == 12
assert f.tell() == user_file.sector_size
with io.open(user_file.path, "rb") as f:
assert f.read(start) == b"x" * start
assert f.read(12) == b"y" * 12
assert f.read() == b"x" * user_file.sector_size
def test_zero_unaligned_buffer_slow_path(user_file):
size = user_file.sector_size * 2
start = user_file.sector_size
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
# Perform slow read-modify-write in the second block.
with file.open(user_file.url, "r+") as f:
f.seek(start)
n = f.zero(10)
assert n == 10
assert f.tell() == start + 10
with io.open(user_file.path, "rb") as f:
assert f.read(start) == b"x" * start
assert f.read(10) == b"\0" * 10
assert f.read() == b"x" * (size - start - 10)
def test_zero_unaligned_offset_complete(user_file):
size = user_file.sector_size * 2
start = user_file.sector_size + 10
with io.open(user_file.path, "wb") as f:
f.write(b"x" * size)
# Zero 10 bytes into the second block.
with file.open(user_file.url, "r+") as f:
f.seek(start)
n = f.zero(10)
assert n == 10
assert f.tell() == start + 10
with io.open(user_file.path, "rb") as f:
assert f.read(start) == b"x" * start
assert f.read(10) == b"\0" * 10
assert f.read() == b"x" * (size - start - 10)
