def test_dirty_extents(tmpdir):
size = 1024**2
# Create base image with empty dirty bitmap.
base = str(tmpdir.join("base.qcow2"))
qemu_img.create(base, "qcow2", size=size)
qemu_img.bitmap_add(base, "b0")
# Write data, modifying the dirty bitmap.
with qemu_nbd.open(base, "qcow2") as c:
c.write(0 * CLUSTER_SIZE, b"A" * CLUSTER_SIZE)
c.zero(1 * CLUSTER_SIZE, CLUSTER_SIZE)
c.flush()
# Create top image with empty dirty bitmap.
top = str(tmpdir.join("top.qcow2"))
qemu_img.create(top, "qcow2", backing_file=base, backing_format="qcow2")
qemu_img.bitmap_add(top, "b0")
# Write data, modifying the dirty bitmap.
with qemu_nbd.open(top, "qcow2") as c:
c.write(3 * CLUSTER_SIZE, b"B" * CLUSTER_SIZE)
c.zero(4 * CLUSTER_SIZE, CLUSTER_SIZE)
c.flush()
dirty_extents = list(client.extents(base, bitmap="b0"))
assert dirty_extents == [
DirtyExtent(start=0 * CLUSTER_SIZE,
length=2 * CLUSTER_SIZE,
dirty=True),
DirtyExtent(start=2 * CLUSTER_SIZE,
length=size - 2 * CLUSTER_SIZE,
dirty=False),
]
dirty_extents = list(client.extents(top, bitmap="b0"))
# Note: qemu-nbd reports dirty extents only for the top image.
assert dirty_extents == [
DirtyExtent(start=0 * CLUSTER_SIZE,
length=3 * CLUSTER_SIZE,
dirty=False),
DirtyExtent(start=3 * CLUSTER_SIZE,
length=2 * CLUSTER_SIZE,
dirty=True),
DirtyExtent(start=5 * CLUSTER_SIZE,
length=size - 5 * CLUSTER_SIZE,
dirty=False),
]
def test_zero_extents_from_ova(tmpdir):
size = 10 * 1024**2
# Create image with data, zero and hole clusters.
disk = str(tmpdir.join("disk.qcow2"))
qemu_img.create(disk, "qcow2", size=size)
with qemu_nbd.open(disk, "qcow2") as c:
c.write(0 * CLUSTER_SIZE, b"A" * CLUSTER_SIZE)
c.zero(1 * CLUSTER_SIZE, CLUSTER_SIZE)
c.flush()
# Create OVA whith this image.
ova = str(tmpdir.join("vm.ova"))
with tarfile.open(ova, "w") as tar:
tar.add(disk, arcname=os.path.basename(disk))
extents = list(client.extents(ova, member="disk.qcow2"))
assert extents == [
ZeroExtent(start=0 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=False,
hole=False),
ZeroExtent(start=1 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=True,
hole=False),
ZeroExtent(start=2 * CLUSTER_SIZE,
length=size - 2 * CLUSTER_SIZE,
zero=True,
hole=True),
]
def test_zero_extents_raw(tmpdir):
size = 10 * 1024**2
# Create image with some data, zero and holes.
image = str(tmpdir.join("image.raw"))
qemu_img.create(image, "raw", size=size)
with qemu_nbd.open(image, "raw") as c:
c.write(0 * CLUSTER_SIZE, b"A" * CLUSTER_SIZE)
c.zero(1 * CLUSTER_SIZE, CLUSTER_SIZE)
c.write(2 * CLUSTER_SIZE, b"B" * CLUSTER_SIZE)
c.flush()
extents = list(client.extents(image))
# Note: raw files report unallocated as zero, not a a hole.
assert extents == [
ZeroExtent(start=0 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=False,
hole=False),
ZeroExtent(start=1 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=True,
hole=False),
ZeroExtent(start=2 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=False,
hole=False),
ZeroExtent(start=3 * CLUSTER_SIZE,
length=size - 3 * CLUSTER_SIZE,
zero=True,
hole=False),
]
def test_zero_extents_qcow2(tmpdir):
size = 10 * 1024**2
# Create base image with one data and one zero cluster.
base = str(tmpdir.join("base.qcow2"))
qemu_img.create(base, "qcow2", size=size)
with qemu_nbd.open(base, "qcow2") as c:
c.write(0 * CLUSTER_SIZE, b"A" * CLUSTER_SIZE)
c.zero(1 * CLUSTER_SIZE, CLUSTER_SIZE)
c.flush()
# Create top image with one data and one zero cluster.
top = str(tmpdir.join("top.qcow2"))
qemu_img.create(
top, "qcow2", backing_file=base, backing_format="qcow2")
with qemu_nbd.open(top, "qcow2") as c:
c.write(3 * CLUSTER_SIZE, b"B" * CLUSTER_SIZE)
c.zero(4 * CLUSTER_SIZE, CLUSTER_SIZE)
c.flush()
extents = list(client.extents(top))
assert extents == [
# Extents from base...
ZeroExtent(
start=0 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=False,
hole=False),
ZeroExtent(
start=1 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=True,
hole=False),
ZeroExtent(
start=2 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=True,
hole=True),
# Extents from top...
ZeroExtent(
start=3 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=False,
hole=False),
ZeroExtent(
start=4 * CLUSTER_SIZE,
length=CLUSTER_SIZE,
zero=True,
hole=False),
# Rest of unallocated data...
ZeroExtent(
start=5 * CLUSTER_SIZE,
length=size - 5 * CLUSTER_SIZE,
zero=True,
hole=True),
]
def test_dirty_extents(tmpdir):
size = 1024**2
# Create base image with empty dirty bitmap.
base = str(tmpdir.join("base.qcow2"))
qemu_img.create(base, "qcow2", size=size)
qemu_img.bitmap_add(base, "b0")
# Write data, modifying the dirty bitmap.
with qemu_nbd.open(base, "qcow2") as c:
c.write(0 * CLUSTER_SIZE, b"A" * CLUSTER_SIZE)
c.zero(1 * CLUSTER_SIZE, CLUSTER_SIZE)
c.flush()
# Create top image with empty dirty bitmap.
top = str(tmpdir.join("top.qcow2"))
qemu_img.create(top, "qcow2", backing_file=base, backing_format="qcow2")
qemu_img.bitmap_add(top, "b0")
# Write data, modifying the dirty bitmap.
with qemu_nbd.open(top, "qcow2") as c:
c.write(3 * CLUSTER_SIZE, b"B" * CLUSTER_SIZE)
c.zero(4 * CLUSTER_SIZE, CLUSTER_SIZE)
c.flush()
dirty_extents = list(client.extents(base, bitmap="b0"))
expected = [
# First cluster is dirty data.
DirtyExtent(
start=0 * CLUSTER_SIZE,
length=1 * CLUSTER_SIZE,
dirty=True,
zero=False),
# Second cluster is dirty zero.
DirtyExtent(
start=1 * CLUSTER_SIZE,
length=1 * CLUSTER_SIZE,
dirty=True,
zero=True),
# Third cluster is clean zero.
DirtyExtent(
start=2 * CLUSTER_SIZE,
length=size - 2 * CLUSTER_SIZE,
dirty=False,
zero=True),
]
log.debug("base image dirty extents: %s", dirty_extents)
assert dirty_extents == expected
dirty_extents = list(client.extents(top, bitmap="b0"))
# Note: qemu-nbd reports dirty extents only for the top image, but zero
# extents are read from the base image.
expected = [
# First cluster is clean data, read from base image.
DirtyExtent(
start=0 * CLUSTER_SIZE,
length=1 * CLUSTER_SIZE,
dirty=False,
zero=False),
# Second and third clusters are read from base image. Because they are
# both clean zero, they are merged.
DirtyExtent(
start=1 * CLUSTER_SIZE,
length=2 * CLUSTER_SIZE,
dirty=False,
zero=True),
# Forth cluster is a data extent modified in top image.
DirtyExtent(
start=3 * CLUSTER_SIZE,
length=1 * CLUSTER_SIZE,
dirty=True,
zero=False),
# Fifth cluster is a zero extent modifed in to image.
DirtyExtent(
start=4 * CLUSTER_SIZE,
length=1 * CLUSTER_SIZE,
dirty=True,
zero=True),
# The rest is clean zero extent.
DirtyExtent(
start=5 * CLUSTER_SIZE,
length=size - 5 * CLUSTER_SIZE,
dirty=False,
zero=True),
]
log.debug("top image dirty extents: %s", dirty_extents)
assert dirty_extents == expected
