tests/qemu-iotests/222

   1 #!/usr/bin/env python
   2 #
   3 # This test covers the basic fleecing workflow, which provides a
   4 # point-in-time snapshot of a node that can be queried over NBD.
   5 #
   6 # Copyright (C) 2018 Red Hat, Inc.
   7 # John helped, too.
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22 # Creator/Owner: John Snow <jsnow@redhat.com>
  23
  24 import iotests
  25 from iotests import log, qemu_img, qemu_io, qemu_io_silent
  26
  27 iotests.verify_platform(['linux'])
  28 iotests.verify_image_format(supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk',
  29                                             'vhdx', 'raw'])
  30
  31 patterns = [("0x5d", "0",         "64k"),
  32             ("0xd5", "1M",        "64k"),
  33             ("0xdc", "32M",       "64k"),
  34             ("0xcd", "0x3ff0000", "64k")]  # 64M - 64K
  35
  36 overwrite = [("0xab", "0",         "64k"), # Full overwrite
  37              ("0xad", "0x00f8000", "64k"), # Partial-left (1M-32K)
  38              ("0x1d", "0x2008000", "64k"), # Partial-right (32M+32K)
  39              ("0xea", "0x3fe0000", "64k")] # Adjacent-left (64M - 128K)
  40
  41 zeroes = [("0", "0x00f8000", "32k"), # Left-end of partial-left (1M-32K)
  42           ("0", "0x2010000", "32k"), # Right-end of partial-right (32M+64K)
  43           ("0", "0x3fe0000", "64k")] # overwrite[3]
  44
  45 remainder = [("0xd5", "0x108000",  "32k"), # Right-end of partial-left [1]
  46              ("0xdc", "32M",       "32k"), # Left-end of partial-right [2]
  47              ("0xcd", "0x3ff0000", "64k")] # patterns[3]
  48
  49 with iotests.FilePath('base.img') as base_img_path, \
  50      iotests.FilePath('fleece.img') as fleece_img_path, \
  51      iotests.FilePath('nbd.sock') as nbd_sock_path, \
  52      iotests.VM() as vm:
  53
  54     log('--- Setting up images ---')
  55     log('')
  56
  57     assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
  58     assert qemu_img('create', '-f', "qcow2", fleece_img_path, '64M') == 0
  59
  60     for p in patterns:
  61         qemu_io('-f', iotests.imgfmt,
  62                 '-c', 'write -P%s %s %s' % p, base_img_path)
  63
  64     log('Done')
  65
  66     log('')
  67     log('--- Launching VM ---')
  68     log('')
  69
  70     vm.add_drive(base_img_path)
  71     vm.launch()
  72     log('Done')
  73
  74     log('')
  75     log('--- Setting up Fleecing Graph ---')
  76     log('')
  77
  78     src_node = "drive0"
  79     tgt_node = "fleeceNode"
  80
  81     # create tgt_node backed by src_node
  82     log(vm.qmp("blockdev-add", **{
  83         "driver": "qcow2",
  84         "node-name": tgt_node,
  85         "file": {
  86             "driver": "file",
  87             "filename": fleece_img_path,
  88         },
  89         "backing": src_node,
  90     }))
  91
  92     # Establish COW from source to fleecing node
  93     log(vm.qmp("blockdev-backup",
  94                device=src_node,
  95                target=tgt_node,
  96                sync="none"))
  97
  98     log('')
  99     log('--- Setting up NBD Export ---')
 100     log('')
 101
 102     nbd_uri = 'nbd+unix:///%s?socket=%s' % (tgt_node, nbd_sock_path)
 103     log(vm.qmp("nbd-server-start",
 104                **{"addr": { "type": "unix",
 105                             "data": { "path": nbd_sock_path } } }))
 106
 107     log(vm.qmp("nbd-server-add", device=tgt_node))
 108
 109     log('')
 110     log('--- Sanity Check ---')
 111     log('')
 112
 113     for p in (patterns + zeroes):
 114         cmd = "read -P%s %s %s" % p
 115         log(cmd)
 116         assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
 117
 118     log('')
 119     log('--- Testing COW ---')
 120     log('')
 121
 122     for p in overwrite:
 123         cmd = "write -P%s %s %s" % p
 124         log(cmd)
 125         log(vm.hmp_qemu_io(src_node, cmd))
 126
 127     log('')
 128     log('--- Verifying Data ---')
 129     log('')
 130
 131     for p in (patterns + zeroes):
 132         cmd = "read -P%s %s %s" % p
 133         log(cmd)
 134         assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
 135
 136     log('')
 137     log('--- Cleanup ---')
 138     log('')
 139
 140     log(vm.qmp('block-job-cancel', device=src_node))
 141     log(vm.event_wait('BLOCK_JOB_CANCELLED'),
 142         filters=[iotests.filter_qmp_event])
 143     log(vm.qmp('nbd-server-stop'))
 144     log(vm.qmp('blockdev-del', node_name=tgt_node))
 145     vm.shutdown()
 146
 147     log('')
 148     log('--- Confirming writes ---')
 149     log('')
 150
 151     for p in (overwrite + remainder):
 152         cmd = "read -P%s %s %s" % p
 153         log(cmd)
 154         assert qemu_io_silent(base_img_path, '-c', cmd) == 0
 155
 156     log('')
 157     log('Done')