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)