tests/qemu-iotests/236

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