tests/qemu-iotests/236

   1 #!/usr/bin/env python3
   2 # group: quick
   3 #
   4 # Test bitmap merges.
   5 #
   6 # Copyright (c) 2018 John Snow for Red Hat, Inc.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21 # owner=jsnow@redhat.com
  22
  23 import iotests
  24 from iotests import log
  25
  26 iotests.script_initialize(supported_fmts=['generic'])
  27 size = 64 * 1024 * 1024
  28 granularity = 64 * 1024
  29
  30 patterns = [("0x5d", "0",         "64k"),
  31             ("0xd5", "1M",        "64k"),
  32             ("0xdc", "32M",       "64k"),
  33             ("0xcd", "0x3ff0000", "64k")]  # 64M - 64K
  34
  35 overwrite = [("0xab", "0",         "64k"), # Full overwrite
  36              ("0xad", "0x00f8000", "64k"), # Partial-left (1M-32K)
  37              ("0x1d", "0x2008000", "64k"), # Partial-right (32M+32K)
  38              ("0xea", "0x3fe0000", "64k")] # Adjacent-left (64M - 128K)
  39
  40 def query_bitmaps(vm):
  41     res = vm.qmp("query-block")
  42     return { "bitmaps": { device['device']: device.get('inserted', {}).get('dirty-bitmaps', []) for
  43                           device in res['return'] } }
  44
  45 with iotests.FilePath('img') as img_path, \
  46      iotests.VM() as vm:
  47
  48     log('--- Preparing image & VM ---\n')
  49     iotests.qemu_img_create('-f', iotests.imgfmt, img_path, str(size))
  50     vm.add_drive(img_path)
  51     vm.launch()
  52
  53     log('\n--- Adding preliminary bitmaps A & B ---\n')
  54     vm.qmp_log("block-dirty-bitmap-add", node="drive0",
  55                name="bitmapA", granularity=granularity)
  56     vm.qmp_log("block-dirty-bitmap-add", node="drive0",
  57                name="bitmapB", granularity=granularity)
  58
  59     # Dirties 4 clusters. count=262144
  60     log('\n--- Emulating writes ---\n')
  61     for p in patterns:
  62         cmd = "write -P%s %s %s" % p
  63         log(cmd)
  64         log(vm.hmp_qemu_io("drive0", cmd))
  65
  66     log(query_bitmaps(vm), indent=2)
  67
  68     log('\n--- Submitting & Aborting Transaction ---\n')
  69     vm.qmp_log("transaction", indent=2, actions=[
  70         { "type": "block-dirty-bitmap-disable",
  71           "data": { "node": "drive0", "name": "bitmapB" }},
  72         { "type": "block-dirty-bitmap-add",
  73           "data": { "node": "drive0", "name": "bitmapC",
  74                     "granularity": granularity }},
  75         { "type": "block-dirty-bitmap-clear",
  76           "data": { "node": "drive0", "name": "bitmapA" }},
  77         { "type": "abort", "data": {}}
  78     ])
  79     log(query_bitmaps(vm), indent=2)
  80
  81     log('\n--- Disabling B & Adding C ---\n')
  82     vm.qmp_log("transaction", indent=2, actions=[
  83         { "type": "block-dirty-bitmap-disable",
  84           "data": { "node": "drive0", "name": "bitmapB" }},
  85         { "type": "block-dirty-bitmap-add",
  86           "data": { "node": "drive0", "name": "bitmapC",
  87                     "granularity": granularity }},
  88         # Purely extraneous, but test that it works:
  89         { "type": "block-dirty-bitmap-disable",
  90           "data": { "node": "drive0", "name": "bitmapC" }},
  91         { "type": "block-dirty-bitmap-enable",
  92           "data": { "node": "drive0", "name": "bitmapC" }},
  93     ])
  94
  95     log('\n--- Emulating further writes ---\n')
  96     # Dirties 6 clusters, 3 of which are new in contrast to "A".
  97     # A = 64 * 1024 * (4 + 3) = 458752
  98     # C = 64 * 1024 * 6       = 393216
  99     for p in overwrite:
 100         cmd = "write -P%s %s %s" % p
 101         log(cmd)
 102         log(vm.hmp_qemu_io("drive0", cmd))
 103
 104     log('\n--- Disabling A & C ---\n')
 105     vm.qmp_log("transaction", indent=2, actions=[
 106         { "type": "block-dirty-bitmap-disable",
 107           "data": { "node": "drive0", "name": "bitmapA" }},
 108         { "type": "block-dirty-bitmap-disable",
 109           "data": { "node": "drive0", "name": "bitmapC" }}
 110     ])
 111
 112     # A: 7 clusters
 113     # B: 4 clusters
 114     # C: 6 clusters
 115     log(query_bitmaps(vm), indent=2)
 116
 117     log('\n--- Submitting & Aborting Merge Transaction ---\n')
 118     vm.qmp_log("transaction", indent=2, actions=[
 119         { "type": "block-dirty-bitmap-add",
 120           "data": { "node": "drive0", "name": "bitmapD",
 121                     "disabled": True, "granularity": granularity }},
 122         { "type": "block-dirty-bitmap-merge",
 123           "data": { "node": "drive0", "target": "bitmapD",
 124                     "bitmaps": ["bitmapB", "bitmapC"] }},
 125         { "type": "abort", "data": {}}
 126     ])
 127     log(query_bitmaps(vm), indent=2)
 128
 129     log('\n--- Creating D as a merge of B & C ---\n')
 130     # Good hygiene: create a disabled bitmap as a merge target.
 131     vm.qmp_log("transaction", indent=2, actions=[
 132         { "type": "block-dirty-bitmap-add",
 133           "data": { "node": "drive0", "name": "bitmapD",
 134                     "disabled": True, "granularity": granularity }},
 135         { "type": "block-dirty-bitmap-merge",
 136           "data": { "node": "drive0", "target": "bitmapD",
 137                     "bitmaps": ["bitmapB", "bitmapC"] }}
 138     ])
 139
 140     # A and D should now both have 7 clusters apiece.
 141     # B and C remain unchanged with 4 and 6 respectively.
 142     log(query_bitmaps(vm), indent=2)
 143
 144     # A and D should be equivalent.
 145     # Some formats round the size of the disk, so don't print the checksums.
 146     check_a = vm.qmp('x-debug-block-dirty-bitmap-sha256',
 147                      node="drive0", name="bitmapA")['return']['sha256']
 148     check_d = vm.qmp('x-debug-block-dirty-bitmap-sha256',
 149                      node="drive0", name="bitmapD")['return']['sha256']
 150     assert(check_a == check_d)
 151
 152     log('\n--- Removing bitmaps A, B, C, and D ---\n')
 153     vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapA")
 154     vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapB")
 155     vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapC")
 156     vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapD")
 157
 158     log('\n--- Final Query ---\n')
 159     log(query_bitmaps(vm), indent=2)
 160
 161     log('\n--- Done ---\n')
 162     vm.shutdown()