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qemu/tests/qemu-iotests/257
Vladimir Sementsov-Ogievskiy 2d0f32e3fc iotests: 257: prepare for backup over block-copy 
Iotest 257 dumps a lot of in-progress information of backup job, such
as offset and bitmap dirtiness. Further commit will move backup to be
one block-copy call, which will introduce async parallel requests
instead of plain cluster-by-cluster copying. To keep things
deterministic, allow only one worker (only one copy request at a time)
for this test.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20210116214705.822267-15-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
2021-01-26 14:36:37 +01:00

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#!/usr/bin/env python3
# group: rw
#
# Test bitmap-sync backups (incremental, differential, and partials)
#
# Copyright (c) 2019 John Snow for Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# owner=jsnow@redhat.com
import math
import os
import iotests
from iotests import log, qemu_img
SIZE = 64 * 1024 * 1024
GRANULARITY = 64 * 1024
class Pattern:
def __init__(self, byte, offset, size=GRANULARITY):
self.byte = byte
self.offset = offset
self.size = size
def bits(self, granularity):
lower = self.offset // granularity
upper = (self.offset + self.size - 1) // granularity
return set(range(lower, upper + 1))
class PatternGroup:
"""Grouping of Pattern objects. Initialize with an iterable of Patterns."""
def __init__(self, patterns):
self.patterns = patterns
def bits(self, granularity):
"""Calculate the unique bits dirtied by this pattern grouping"""
res = set()
for pattern in self.patterns:
res |= pattern.bits(granularity)
return res
GROUPS = [
PatternGroup([
# Batch 0: 4 clusters
Pattern('0x49', 0x0000000),
Pattern('0x6c', 0x0100000), # 1M
Pattern('0x6f', 0x2000000), # 32M
Pattern('0x76', 0x3ff0000)]), # 64M - 64K
PatternGroup([
# Batch 1: 6 clusters (3 new)
Pattern('0x65', 0x0000000), # Full overwrite
Pattern('0x77', 0x00f8000), # Partial-left (1M-32K)
Pattern('0x72', 0x2008000), # Partial-right (32M+32K)
Pattern('0x69', 0x3fe0000)]), # Adjacent-left (64M - 128K)
PatternGroup([
# Batch 2: 7 clusters (3 new)
Pattern('0x74', 0x0010000), # Adjacent-right
Pattern('0x69', 0x00e8000), # Partial-left (1M-96K)
Pattern('0x6e', 0x2018000), # Partial-right (32M+96K)
Pattern('0x67', 0x3fe0000,
2*GRANULARITY)]), # Overwrite [(64M-128K)-64M)
PatternGroup([
# Batch 3: 8 clusters (5 new)
# Carefully chosen such that nothing re-dirties the one cluster
# that copies out successfully before failure in Group #1.
Pattern('0xaa', 0x0010000,
3*GRANULARITY), # Overwrite and 2x Adjacent-right
Pattern('0xbb', 0x00d8000), # Partial-left (1M-160K)
Pattern('0xcc', 0x2028000), # Partial-right (32M+160K)
Pattern('0xdd', 0x3fc0000)]), # New; leaving a gap to the right
]
class EmulatedBitmap:
def __init__(self, granularity=GRANULARITY):
self._bits = set()
self.granularity = granularity
def dirty_bits(self, bits):
self._bits |= set(bits)
def dirty_group(self, n):
self.dirty_bits(GROUPS[n].bits(self.granularity))
def clear(self):
self._bits = set()
def clear_bits(self, bits):
self._bits -= set(bits)
def clear_bit(self, bit):
self.clear_bits({bit})
def clear_group(self, n):
self.clear_bits(GROUPS[n].bits(self.granularity))
@property
def first_bit(self):
return sorted(self.bits)[0]
@property
def bits(self):
return self._bits
@property
def count(self):
return len(self.bits)
def compare(self, qmp_bitmap):
"""
Print a nice human-readable message checking that a bitmap as reported
by the QMP interface has as many bits set as we expect it to.
"""
name = qmp_bitmap.get('name', '(anonymous)')
log("= Checking Bitmap {:s} =".format(name))
want = self.count
have = qmp_bitmap['count'] // qmp_bitmap['granularity']
log("expecting {:d} dirty sectors; have {:d}. {:s}".format(
want, have, "OK!" if want == have else "ERROR!"))
log('')
class Drive:
"""Represents, vaguely, a drive attached to a VM.
Includes format, graph, and device information."""
def __init__(self, path, vm=None):
self.path = path
self.vm = vm
self.fmt = None
self.size = None
self.node = None
def img_create(self, fmt, size):
self.fmt = fmt
self.size = size
iotests.qemu_img_create('-f', self.fmt, self.path, str(self.size))
def create_target(self, name, fmt, size):
basename = os.path.basename(self.path)
file_node_name = "file_{}".format(basename)
vm = self.vm
log(vm.command('blockdev-create', job_id='bdc-file-job',
options={
'driver': 'file',
'filename': self.path,
'size': 0,
}))
vm.run_job('bdc-file-job')
log(vm.command('blockdev-add', driver='file',
node_name=file_node_name, filename=self.path))
log(vm.command('blockdev-create', job_id='bdc-fmt-job',
options={
'driver': fmt,
'file': file_node_name,
'size': size,
}))
vm.run_job('bdc-fmt-job')
log(vm.command('blockdev-add', driver=fmt,
node_name=name,
file=file_node_name))
self.fmt = fmt
self.size = size
self.node = name
def blockdev_backup(vm, device, target, sync, **kwargs):
# Strip any arguments explicitly nulled by the caller:
kwargs = {key: val for key, val in kwargs.items() if val is not None}
result = vm.qmp_log('blockdev-backup',
device=device,
target=target,
sync=sync,
filter_node_name='backup-top',
x_perf={'max-workers': 1},
**kwargs)
return result
def blockdev_backup_mktarget(drive, target_id, filepath, sync, **kwargs):
target_drive = Drive(filepath, vm=drive.vm)
target_drive.create_target(target_id, drive.fmt, drive.size)
blockdev_backup(drive.vm, drive.node, target_id, sync, **kwargs)
def reference_backup(drive, n, filepath):
log("--- Reference Backup #{:d} ---\n".format(n))
target_id = "ref_target_{:d}".format(n)
job_id = "ref_backup_{:d}".format(n)
blockdev_backup_mktarget(drive, target_id, filepath, "full",
job_id=job_id)
drive.vm.run_job(job_id, auto_dismiss=True)
log('')
def backup(drive, n, filepath, sync, **kwargs):
log("--- Test Backup #{:d} ---\n".format(n))
target_id = "backup_target_{:d}".format(n)
job_id = "backup_{:d}".format(n)
kwargs.setdefault('auto-finalize', False)
blockdev_backup_mktarget(drive, target_id, filepath, sync,
job_id=job_id, **kwargs)
return job_id
def perform_writes(drive, n, filter_node_name=None):
log("--- Write #{:d} ---\n".format(n))
for pattern in GROUPS[n].patterns:
cmd = "write -P{:s} 0x{:07x} 0x{:x}".format(
pattern.byte,
pattern.offset,
pattern.size)
log(cmd)
log(drive.vm.hmp_qemu_io(filter_node_name or drive.node, cmd))
bitmaps = drive.vm.query_bitmaps()
log({'bitmaps': bitmaps}, indent=2)
log('')
return bitmaps
def compare_images(image, reference, baseimg=None, expected_match=True):
"""
Print a nice human-readable message comparing these images.
"""
expected_ret = 0 if expected_match else 1
if baseimg:
assert qemu_img("rebase", "-u", "-b", baseimg, '-F', iotests.imgfmt,
image) == 0
ret = qemu_img("compare", image, reference)
log('qemu_img compare "{:s}" "{:s}" ==> {:s}, {:s}'.format(
image, reference,
"Identical" if ret == 0 else "Mismatch",
"OK!" if ret == expected_ret else "ERROR!"),
filters=[iotests.filter_testfiles])
def test_bitmap_sync(bsync_mode, msync_mode='bitmap', failure=None):
"""
Test bitmap backup routines.
:param bsync_mode: Is the Bitmap Sync mode, and can be any of:
- on-success: This is the "incremental" style mode. Bitmaps are
synchronized to what was copied out only on success.
(Partial images must be discarded.)
- never: This is the "differential" style mode.
Bitmaps are never synchronized.
- always: This is a "best effort" style mode.
Bitmaps are always synchronized, regardless of failure.
(Partial images must be kept.)
:param msync_mode: The mirror sync mode to use for the first backup.
Can be any one of:
- bitmap: Backups based on bitmap manifest.
- full: Full backups.
- top: Full backups of the top layer only.
:param failure: Is the (optional) failure mode, and can be any of:
- None: No failure. Test the normative path. Default.
- simulated: Cancel the job right before it completes.
This also tests writes "during" the job.
- intermediate: This tests a job that fails mid-process and produces
an incomplete backup. Testing limitations prevent
testing competing writes.
"""
with iotests.FilePath(
'img', 'bsync1', 'bsync2', 'fbackup0', 'fbackup1', 'fbackup2') as \
(img_path, bsync1, bsync2, fbackup0, fbackup1, fbackup2), \
iotests.VM() as vm:
mode = "Mode {:s}; Bitmap Sync {:s}".format(msync_mode, bsync_mode)
preposition = "with" if failure else "without"
cond = "{:s} {:s}".format(preposition,
"{:s} failure".format(failure) if failure
else "failure")
log("\n=== {:s} {:s} ===\n".format(mode, cond))
log('--- Preparing image & VM ---\n')
drive0 = Drive(img_path, vm=vm)
drive0.img_create(iotests.imgfmt, SIZE)
vm.add_device("{},id=scsi0".format(iotests.get_virtio_scsi_device()))
vm.launch()
file_config = {
'driver': 'file',
'filename': drive0.path
}
if failure == 'intermediate':
file_config = {
'driver': 'blkdebug',
'image': file_config,
'set-state': [{
'event': 'flush_to_disk',
'state': 1,
'new_state': 2
}, {
'event': 'read_aio',
'state': 2,
'new_state': 3
}],
'inject-error': [{
'event': 'read_aio',
'errno': 5,
'state': 3,
'immediately': False,
'once': True
}]
}
drive0.node = 'drive0'
vm.qmp_log('blockdev-add',
filters=[iotests.filter_qmp_testfiles],
node_name=drive0.node,
driver=drive0.fmt,
file=file_config)
log('')
# 0 - Writes and Reference Backup
perform_writes(drive0, 0)
reference_backup(drive0, 0, fbackup0)
log('--- Add Bitmap ---\n')
vm.qmp_log("block-dirty-bitmap-add", node=drive0.node,
name="bitmap0", granularity=GRANULARITY)
log('')
ebitmap = EmulatedBitmap()
# 1 - Writes and Reference Backup
bitmaps = perform_writes(drive0, 1)
ebitmap.dirty_group(1)
bitmap = vm.get_bitmap(drive0.node, 'bitmap0', bitmaps=bitmaps)
ebitmap.compare(bitmap)
reference_backup(drive0, 1, fbackup1)
# 1 - Test Backup (w/ Optional induced failure)
if failure == 'intermediate':
# Activate blkdebug induced failure for second-to-next read
log(vm.hmp_qemu_io(drive0.node, 'flush'))
log('')
job = backup(drive0, 1, bsync1, msync_mode,
bitmap="bitmap0", bitmap_mode=bsync_mode)
def _callback():
"""Issue writes while the job is open to test bitmap divergence."""
# Note: when `failure` is 'intermediate', this isn't called.
log('')
bitmaps = perform_writes(drive0, 2, filter_node_name='backup-top')
# Named bitmap (static, should be unchanged)
ebitmap.compare(vm.get_bitmap(drive0.node, 'bitmap0',
bitmaps=bitmaps))
# Anonymous bitmap (dynamic, shows new writes)
anonymous = EmulatedBitmap()
anonymous.dirty_group(2)
anonymous.compare(vm.get_bitmap(drive0.node, '', recording=True,
bitmaps=bitmaps))
# Simulate the order in which this will happen:
# group 1 gets cleared first, then group two gets written.
if ((bsync_mode == 'on-success' and not failure) or
(bsync_mode == 'always')):
ebitmap.clear()
ebitmap.dirty_group(2)
vm.run_job(job, auto_dismiss=True, auto_finalize=False,
pre_finalize=_callback,
cancel=(failure == 'simulated'))
bitmaps = vm.query_bitmaps()
log({'bitmaps': bitmaps}, indent=2)
log('')
if bsync_mode == 'always' and failure == 'intermediate':
# TOP treats anything allocated as dirty, expect to see:
if msync_mode == 'top':
ebitmap.dirty_group(0)
# We manage to copy one sector (one bit) before the error.
ebitmap.clear_bit(ebitmap.first_bit)
# Full returns all bits set except what was copied/skipped
if msync_mode == 'full':
fail_bit = ebitmap.first_bit
ebitmap.clear()
ebitmap.dirty_bits(range(fail_bit, SIZE // GRANULARITY))
ebitmap.compare(vm.get_bitmap(drive0.node, 'bitmap0', bitmaps=bitmaps))
# 2 - Writes and Reference Backup
bitmaps = perform_writes(drive0, 3)
ebitmap.dirty_group(3)
ebitmap.compare(vm.get_bitmap(drive0.node, 'bitmap0', bitmaps=bitmaps))
reference_backup(drive0, 2, fbackup2)
# 2 - Bitmap Backup (In failure modes, this is a recovery.)
job = backup(drive0, 2, bsync2, "bitmap",
bitmap="bitmap0", bitmap_mode=bsync_mode)
vm.run_job(job, auto_dismiss=True, auto_finalize=False)
bitmaps = vm.query_bitmaps()
log({'bitmaps': bitmaps}, indent=2)
log('')
if bsync_mode != 'never':
ebitmap.clear()
ebitmap.compare(vm.get_bitmap(drive0.node, 'bitmap0', bitmaps=bitmaps))
log('--- Cleanup ---\n')
vm.qmp_log("block-dirty-bitmap-remove",
node=drive0.node, name="bitmap0")
bitmaps = vm.query_bitmaps()
log({'bitmaps': bitmaps}, indent=2)
vm.shutdown()
log('')
log('--- Verification ---\n')
# 'simulated' failures will actually all pass here because we canceled
# while "pending". This is actually undefined behavior,
# don't rely on this to be true!
compare_images(bsync1, fbackup1, baseimg=fbackup0,
expected_match=failure != 'intermediate')
if not failure or bsync_mode == 'always':
# Always keep the last backup on success or when using 'always'
base = bsync1
else:
base = fbackup0
compare_images(bsync2, fbackup2, baseimg=base)
compare_images(img_path, fbackup2)
log('')
def test_backup_api():
"""
Test malformed and prohibited invocations of the backup API.
"""
with iotests.FilePath('img', 'bsync1') as (img_path, backup_path), \
iotests.VM() as vm:
log("\n=== API failure tests ===\n")
log('--- Preparing image & VM ---\n')
drive0 = Drive(img_path, vm=vm)
drive0.img_create(iotests.imgfmt, SIZE)
vm.add_device("{},id=scsi0".format(iotests.get_virtio_scsi_device()))
vm.launch()
file_config = {
'driver': 'file',
'filename': drive0.path
}
drive0.node = 'drive0'
vm.qmp_log('blockdev-add',
filters=[iotests.filter_qmp_testfiles],
node_name=drive0.node,
driver=drive0.fmt,
file=file_config)
log('')
target0 = Drive(backup_path, vm=vm)
target0.create_target("backup_target", drive0.fmt, drive0.size)
log('')
vm.qmp_log("block-dirty-bitmap-add", node=drive0.node,
name="bitmap0", granularity=GRANULARITY)
log('')
log('-- Testing invalid QMP commands --\n')
error_cases = {
'incremental': {
None: ['on-success', 'always', 'never', None],
'bitmap404': ['on-success', 'always', 'never', None],
'bitmap0': ['always', 'never']
},
'bitmap': {
None: ['on-success', 'always', 'never', None],
'bitmap404': ['on-success', 'always', 'never', None],
'bitmap0': [None],
},
'full': {
None: ['on-success', 'always', 'never'],
'bitmap404': ['on-success', 'always', 'never', None],
'bitmap0': ['never', None],
},
'top': {
None: ['on-success', 'always', 'never'],
'bitmap404': ['on-success', 'always', 'never', None],
'bitmap0': ['never', None],
},
'none': {
None: ['on-success', 'always', 'never'],
'bitmap404': ['on-success', 'always', 'never', None],
'bitmap0': ['on-success', 'always', 'never', None],
}
}
# Dicts, as always, are not stably-ordered prior to 3.7, so use tuples:
for sync_mode in ('incremental', 'bitmap', 'full', 'top', 'none'):
log("-- Sync mode {:s} tests --\n".format(sync_mode))
for bitmap in (None, 'bitmap404', 'bitmap0'):
for policy in error_cases[sync_mode][bitmap]:
blockdev_backup(drive0.vm, drive0.node, "backup_target",
sync_mode, job_id='api_job',
bitmap=bitmap, bitmap_mode=policy)
log('')
def main():
for bsync_mode in ("never", "on-success", "always"):
for failure in ("simulated", "intermediate", None):
test_bitmap_sync(bsync_mode, "bitmap", failure)
for sync_mode in ('full', 'top'):
for bsync_mode in ('on-success', 'always'):
for failure in ('simulated', 'intermediate', None):
test_bitmap_sync(bsync_mode, sync_mode, failure)
test_backup_api()
if __name__ == '__main__':
iotests.script_main(main, supported_fmts=['qcow2'],
supported_protocols=['file'])
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