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#!/usr/bin/env python3
# group: rw backing
#
# Copyright (C) 2019 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/>.
#
# Creator/Owner: Kevin Wolf <kwolf@redhat.com>
#
# Some tests for short backing files and short overlays
import iotests
iotests.script_initialize(supported_fmts=['qcow2'],
supported_platforms=['linux'],
unsupported_imgopts=['refcount_bits', 'compat'])
size_short = 1 * 1024 * 1024
size_long = 2 * 1024 * 1024
size_diff = size_long - size_short
def create_chain() -> None:
iotests.qemu_img_create('-f', iotests.imgfmt, base, str(size_long))
iotests.qemu_img_create('-f', iotests.imgfmt, '-b', base,
'-F', iotests.imgfmt, mid, str(size_short))
iotests.qemu_img_create('-f', iotests.imgfmt, '-b', mid,
'-F', iotests.imgfmt, top, str(size_long))
iotests.qemu_io_log('-c', 'write -P 1 0 %d' % size_long, base)
def create_vm() -> iotests.VM:
vm = iotests.VM()
vm.add_blockdev('file,filename=%s,node-name=base-file' % base)
vm.add_blockdev('%s,file=base-file,node-name=base' % iotests.imgfmt)
vm.add_blockdev('file,filename=%s,node-name=mid-file' % mid)
vm.add_blockdev('%s,file=mid-file,node-name=mid,backing=base'
% iotests.imgfmt)
vm.add_drive(top, 'backing=mid,node-name=top')
return vm
with iotests.FilePath('base') as base, \
iotests.FilePath('mid') as mid, \
iotests.FilePath('top') as top:
iotests.log('== Commit tests ==')
create_chain()
iotests.log('=== Check visible data ===')
iotests.qemu_io_log('-c', 'read -P 1 0 %d' % size_short, top)
iotests.qemu_io_log('-c', 'read -P 0 %d %d' % (size_short, size_diff), top)
iotests.log('=== Checking allocation status ===')
iotests.qemu_io_log('-c', 'alloc 0 %d' % size_short,
'-c', 'alloc %d %d' % (size_short, size_diff),
base)
iotests.qemu_io_log('-c', 'alloc 0 %d' % size_short,
'-c', 'alloc %d %d' % (size_short, size_diff),
mid)
iotests.qemu_io_log('-c', 'alloc 0 %d' % size_short,
'-c', 'alloc %d %d' % (size_short, size_diff),
top)
iotests.log('=== Checking map ===')
iotests.qemu_img_log('map', '--output=json', base)
iotests.qemu_img_log('map', '--output=human', base)
iotests.qemu_img_log('map', '--output=json', mid)
iotests.qemu_img_log('map', '--output=human', mid)
iotests.qemu_img_log('map', '--output=json', top)
iotests.qemu_img_log('map', '--output=human', top)
iotests.log('=== Testing qemu-img commit (top -> mid) ===')
iotests.qemu_img_log('commit', top)
iotests.img_info_log(mid)
iotests.qemu_io_log('-c', 'read -P 1 0 %d' % size_short, mid)
iotests.qemu_io_log('-c', 'read -P 0 %d %d' % (size_short, size_diff), mid)
iotests.log('=== Testing HMP commit (top -> mid) ===')
create_chain()
with create_vm() as vm:
vm.launch()
vm.qmp_log('human-monitor-command', command_line='commit drive0')
iotests.img_info_log(mid)
iotests.qemu_io_log('-c', 'read -P 1 0 %d' % size_short, mid)
iotests.qemu_io_log('-c', 'read -P 0 %d %d' % (size_short, size_diff), mid)
iotests.log('=== Testing QMP active commit (top -> mid) ===')
create_chain()
with create_vm() as vm:
vm.launch()
vm.qmp_log('block-commit', device='top', base_node='mid',
job_id='job0', auto_dismiss=False)
vm.run_job('job0', wait=5)
iotests.img_info_log(mid)
iotests.qemu_io_log('-c', 'read -P 1 0 %d' % size_short, mid)
iotests.qemu_io_log('-c', 'read -P 0 %d %d' % (size_short, size_diff), mid)
iotests.log('=== Testing qemu-img commit (top -> base) ===')
create_chain()
iotests.qemu_img_log('commit', '-b', base, top)
iotests.img_info_log(base)
iotests.qemu_io_log('-c', 'read -P 1 0 %d' % size_short, base)
iotests.qemu_io_log('-c', 'read -P 0 %d %d' % (size_short, size_diff), base)
iotests.log('=== Testing QMP active commit (top -> base) ===')
create_chain()
with create_vm() as vm:
vm.launch()
vm.qmp_log('block-commit', device='top', base_node='base',
job_id='job0', auto_dismiss=False)
vm.run_job('job0', wait=5)
iotests.img_info_log(mid)
iotests.qemu_io_log('-c', 'read -P 1 0 %d' % size_short, base)
iotests.qemu_io_log('-c', 'read -P 0 %d %d' % (size_short, size_diff), base)
iotests.log('== Resize tests ==')
# Use different sizes for different allocation modes:
#
# We want to have at least one test where 32 bit truncation in the size of
# the overlapping area becomes visible. This is covered by the
# prealloc='off' case (1G to 6G is an overlap of 5G).
#
# However, we can only do this for modes that don't preallocate data
# because otherwise we might run out of space on the test host.
#
# We also want to test some unaligned combinations.
for (prealloc, base_size, top_size_old, top_size_new, off) in [
('off', '6G', '1G', '8G', '5G'),
('metadata', '32G', '30G', '33G', '31G'),
('falloc', '10M', '5M', '15M', '9M'),
('full', '16M', '8M', '12M', '11M'),
('off', '384k', '253k', '512k', '253k'),
('off', '400k', '256k', '512k', '336k'),
('off', '512k', '256k', '500k', '436k')]:
iotests.log('=== preallocation=%s ===' % prealloc)
iotests.qemu_img_create('-f', iotests.imgfmt, base, base_size)
iotests.qemu_img_create('-f', iotests.imgfmt, '-b', base,
'-F', iotests.imgfmt, top, top_size_old)
iotests.qemu_io_log('-c', 'write -P 1 %s 64k' % off, base)
# After this, top_size_old to base_size should be allocated/zeroed.
#
# In theory, leaving base_size to top_size_new unallocated would be
# correct, but in practice, if we zero out anything, we zero out
# everything up to top_size_new.
iotests.qemu_img_log('resize', '-f', iotests.imgfmt,
'--preallocation', prealloc, top, top_size_new)
iotests.qemu_io_log('-c', 'read -P 0 %s 64k' % off, top)
iotests.qemu_io_log('-c', 'map', top)
iotests.qemu_img_log('map', '--output=json', top)
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