17c477526SPhilippe Mathieu-Daudé#!/usr/bin/env python3 29dd003a9SVladimir Sementsov-Ogievskiy# group: rw quick 33e7a95feSMax Reitz# 43e7a95feSMax Reitz# Copy-on-read tests using a COR filter node 53e7a95feSMax Reitz# 63e7a95feSMax Reitz# Copyright (C) 2018 Red Hat, Inc. 73e7a95feSMax Reitz# 83e7a95feSMax Reitz# This program is free software; you can redistribute it and/or modify 93e7a95feSMax Reitz# it under the terms of the GNU General Public License as published by 103e7a95feSMax Reitz# the Free Software Foundation; either version 2 of the License, or 113e7a95feSMax Reitz# (at your option) any later version. 123e7a95feSMax Reitz# 133e7a95feSMax Reitz# This program is distributed in the hope that it will be useful, 143e7a95feSMax Reitz# but WITHOUT ANY WARRANTY; without even the implied warranty of 153e7a95feSMax Reitz# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 163e7a95feSMax Reitz# GNU General Public License for more details. 173e7a95feSMax Reitz# 183e7a95feSMax Reitz# You should have received a copy of the GNU General Public License 193e7a95feSMax Reitz# along with this program. If not, see <http://www.gnu.org/licenses/>. 203e7a95feSMax Reitz# 21*42a5009dSJohn Snow# Creator/Owner: Hanna Reitz <hreitz@redhat.com> 223e7a95feSMax Reitz 233e7a95feSMax Reitzimport iotests 24e4ca4e98SMax Reitzfrom iotests import log, qemu_img, qemu_io_silent 253e7a95feSMax Reitz 263e7a95feSMax Reitz# Need backing file support 277d814059SJohn Snowiotests.script_initialize(supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk'], 287d814059SJohn Snow supported_platforms=['linux']) 293e7a95feSMax Reitz 303e7a95feSMax Reitzlog('') 313e7a95feSMax Reitzlog('=== Copy-on-read across nodes ===') 323e7a95feSMax Reitzlog('') 333e7a95feSMax Reitz 343e7a95feSMax Reitz# The old copy-on-read mechanism without a filter node cannot request 353e7a95feSMax Reitz# WRITE_UNCHANGED permissions for its child. Therefore it just tries 363e7a95feSMax Reitz# to sneak its write by the usual permission system and holds its 373e7a95feSMax Reitz# fingers crossed. However, that sneaking does not work so well when 383e7a95feSMax Reitz# there is a filter node in the way: That will receive the write 393e7a95feSMax Reitz# request and re-issue a new one to its child, which this time is a 403e7a95feSMax Reitz# proper write request that will make the permission system cough -- 413e7a95feSMax Reitz# unless there is someone at the top (like a guest device) that has 423e7a95feSMax Reitz# requested write permissions. 433e7a95feSMax Reitz# 443e7a95feSMax Reitz# A COR filter node, however, can request the proper permissions for 453e7a95feSMax Reitz# its child and therefore is not hit by this issue. 463e7a95feSMax Reitz 473e7a95feSMax Reitzwith iotests.FilePath('base.img') as base_img_path, \ 483e7a95feSMax Reitz iotests.FilePath('top.img') as top_img_path, \ 493e7a95feSMax Reitz iotests.VM() as vm: 503e7a95feSMax Reitz 513e7a95feSMax Reitz log('--- Setting up images ---') 523e7a95feSMax Reitz log('') 533e7a95feSMax Reitz 54fc272d3cSJohn Snow qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') 55e4ca4e98SMax Reitz assert qemu_io_silent(base_img_path, '-c', 'write -P 1 0M 1M') == 0 56fc272d3cSJohn Snow qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path, 57fc272d3cSJohn Snow '-F', iotests.imgfmt, top_img_path) 58e4ca4e98SMax Reitz assert qemu_io_silent(top_img_path, '-c', 'write -P 2 1M 1M') == 0 593e7a95feSMax Reitz 60e4ca4e98SMax Reitz log('Done') 613e7a95feSMax Reitz 623e7a95feSMax Reitz log('') 633e7a95feSMax Reitz log('--- Doing COR ---') 643e7a95feSMax Reitz log('') 653e7a95feSMax Reitz 663e7a95feSMax Reitz # Compare with e.g. the following: 673e7a95feSMax Reitz # vm.add_drive_raw('if=none,node-name=node0,copy-on-read=on,driver=raw,' \ 683e7a95feSMax Reitz # 'file.driver=%s,file.file.filename=%s' % 693e7a95feSMax Reitz # (iotests.imgfmt, top_img_path)) 703e7a95feSMax Reitz # (Remove the blockdev-add instead.) 713e7a95feSMax Reitz # ((Not tested here because it hits an assertion in the permission 723e7a95feSMax Reitz # system.)) 733e7a95feSMax Reitz 743e7a95feSMax Reitz vm.launch() 753e7a95feSMax Reitz 763e7a95feSMax Reitz log(vm.qmp('blockdev-add', 773e7a95feSMax Reitz node_name='node0', 783e7a95feSMax Reitz driver='copy-on-read', 793e7a95feSMax Reitz file={ 803e7a95feSMax Reitz 'driver': 'raw', 813e7a95feSMax Reitz 'file': { 823e7a95feSMax Reitz 'driver': 'copy-on-read', 833e7a95feSMax Reitz 'file': { 843e7a95feSMax Reitz 'driver': 'raw', 853e7a95feSMax Reitz 'file': { 863e7a95feSMax Reitz 'driver': iotests.imgfmt, 873e7a95feSMax Reitz 'file': { 883e7a95feSMax Reitz 'driver': 'file', 893e7a95feSMax Reitz 'filename': top_img_path 903e7a95feSMax Reitz }, 913e7a95feSMax Reitz 'backing': { 923e7a95feSMax Reitz 'driver': iotests.imgfmt, 933e7a95feSMax Reitz 'file': { 943e7a95feSMax Reitz 'driver': 'file', 953e7a95feSMax Reitz 'filename': base_img_path 963e7a95feSMax Reitz } 973e7a95feSMax Reitz } 983e7a95feSMax Reitz } 993e7a95feSMax Reitz } 1003e7a95feSMax Reitz } 1013e7a95feSMax Reitz })) 1023e7a95feSMax Reitz 1033e7a95feSMax Reitz # Trigger COR 1043e7a95feSMax Reitz log(vm.qmp('human-monitor-command', 1053e7a95feSMax Reitz command_line='qemu-io node0 "read 0 64M"')) 1063e7a95feSMax Reitz 1073e7a95feSMax Reitz vm.shutdown() 1083e7a95feSMax Reitz 1093e7a95feSMax Reitz log('') 1103e7a95feSMax Reitz log('--- Checking COR result ---') 1113e7a95feSMax Reitz log('') 1123e7a95feSMax Reitz 113e4ca4e98SMax Reitz assert qemu_io_silent(base_img_path, '-c', 'discard 0 64M') == 0 114e4ca4e98SMax Reitz assert qemu_io_silent(top_img_path, '-c', 'read -P 1 0M 1M') == 0 115e4ca4e98SMax Reitz assert qemu_io_silent(top_img_path, '-c', 'read -P 2 1M 1M') == 0 116e4ca4e98SMax Reitz 117e4ca4e98SMax Reitz log('Done') 118