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Diffstat (limited to 'tests/qemu-iotests/216')
| -rwxr-xr-x | tests/qemu-iotests/216 | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/tests/qemu-iotests/216 b/tests/qemu-iotests/216 new file mode 100755 index 000000000..c02f8d288 --- /dev/null +++ b/tests/qemu-iotests/216 @@ -0,0 +1,117 @@ +#!/usr/bin/env python3 +# group: rw quick +# +# Copy-on-read tests using a COR filter node +# +# Copyright (C) 2018 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: Max Reitz <mreitz@redhat.com> + +import iotests +from iotests import log, qemu_img, qemu_io_silent + +# Need backing file support +iotests.script_initialize(supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk'], + supported_platforms=['linux']) + +log('') +log('=== Copy-on-read across nodes ===') +log('') + +# The old copy-on-read mechanism without a filter node cannot request +# WRITE_UNCHANGED permissions for its child. Therefore it just tries +# to sneak its write by the usual permission system and holds its +# fingers crossed. However, that sneaking does not work so well when +# there is a filter node in the way: That will receive the write +# request and re-issue a new one to its child, which this time is a +# proper write request that will make the permission system cough -- +# unless there is someone at the top (like a guest device) that has +# requested write permissions. +# +# A COR filter node, however, can request the proper permissions for +# its child and therefore is not hit by this issue. + +with iotests.FilePath('base.img') as base_img_path, \ + iotests.FilePath('top.img') as top_img_path, \ + iotests.VM() as vm: + + log('--- Setting up images ---') + log('') + + assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0 + assert qemu_io_silent(base_img_path, '-c', 'write -P 1 0M 1M') == 0 + assert qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path, + '-F', iotests.imgfmt, top_img_path) == 0 + assert qemu_io_silent(top_img_path, '-c', 'write -P 2 1M 1M') == 0 + + log('Done') + + log('') + log('--- Doing COR ---') + log('') + + # Compare with e.g. the following: + # vm.add_drive_raw('if=none,node-name=node0,copy-on-read=on,driver=raw,' \ + # 'file.driver=%s,file.file.filename=%s' % + # (iotests.imgfmt, top_img_path)) + # (Remove the blockdev-add instead.) + # ((Not tested here because it hits an assertion in the permission + # system.)) + + vm.launch() + + log(vm.qmp('blockdev-add', + node_name='node0', + driver='copy-on-read', + file={ + 'driver': 'raw', + 'file': { + 'driver': 'copy-on-read', + 'file': { + 'driver': 'raw', + 'file': { + 'driver': iotests.imgfmt, + 'file': { + 'driver': 'file', + 'filename': top_img_path + }, + 'backing': { + 'driver': iotests.imgfmt, + 'file': { + 'driver': 'file', + 'filename': base_img_path + } + } + } + } + } + })) + + # Trigger COR + log(vm.qmp('human-monitor-command', + command_line='qemu-io node0 "read 0 64M"')) + + vm.shutdown() + + log('') + log('--- Checking COR result ---') + log('') + + assert qemu_io_silent(base_img_path, '-c', 'discard 0 64M') == 0 + assert qemu_io_silent(top_img_path, '-c', 'read -P 1 0M 1M') == 0 + assert qemu_io_silent(top_img_path, '-c', 'read -P 2 1M 1M') == 0 + + log('Done') |