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#!/usr/bin/env python
#
# Test bitmap merges.
#
# Copyright (c) 2018 John Snow for 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/>.
#
# owner=jsnow@redhat.com
import iotests
from iotests import log
iotests.verify_image_format(supported_fmts=['generic'])
size = 64 * 1024 * 1024
granularity = 64 * 1024
patterns = [("0x5d", "0", "64k"),
("0xd5", "1M", "64k"),
("0xdc", "32M", "64k"),
("0xcd", "0x3ff0000", "64k")] # 64M - 64K
overwrite = [("0xab", "0", "64k"), # Full overwrite
("0xad", "0x00f8000", "64k"), # Partial-left (1M-32K)
("0x1d", "0x2008000", "64k"), # Partial-right (32M+32K)
("0xea", "0x3fe0000", "64k")] # Adjacent-left (64M - 128K)
def query_bitmaps(vm):
res = vm.qmp("query-block")
return { "bitmaps": { device['device']: device.get('dirty-bitmaps', []) for
device in res['return'] } }
with iotests.FilePath('img') as img_path, \
iotests.VM() as vm:
log('--- Preparing image & VM ---\n')
iotests.qemu_img_create('-f', iotests.imgfmt, img_path, str(size))
vm.add_drive(img_path)
vm.launch()
log('\n--- Adding preliminary bitmaps A & B ---\n')
vm.qmp_log("block-dirty-bitmap-add", node="drive0",
name="bitmapA", granularity=granularity)
vm.qmp_log("block-dirty-bitmap-add", node="drive0",
name="bitmapB", granularity=granularity)
# Dirties 4 clusters. count=262144
log('\n--- Emulating writes ---\n')
for p in patterns:
cmd = "write -P%s %s %s" % p
log(cmd)
log(vm.hmp_qemu_io("drive0", cmd))
log(query_bitmaps(vm), indent=2)
log('\n--- Submitting & Aborting Transaction ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapB" }},
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapC",
"granularity": granularity }},
{ "type": "block-dirty-bitmap-clear",
"data": { "node": "drive0", "name": "bitmapA" }},
{ "type": "abort", "data": {}}
])
log(query_bitmaps(vm), indent=2)
log('\n--- Disabling B & Adding C ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapB" }},
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapC",
"granularity": granularity }},
# Purely extraneous, but test that it works:
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapC" }},
{ "type": "block-dirty-bitmap-enable",
"data": { "node": "drive0", "name": "bitmapC" }},
])
log('\n--- Emulating further writes ---\n')
# Dirties 6 clusters, 3 of which are new in contrast to "A".
# A = 64 * 1024 * (4 + 3) = 458752
# C = 64 * 1024 * 6 = 393216
for p in overwrite:
cmd = "write -P%s %s %s" % p
log(cmd)
log(vm.hmp_qemu_io("drive0", cmd))
log('\n--- Disabling A & C ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapA" }},
{ "type": "block-dirty-bitmap-disable",
"data": { "node": "drive0", "name": "bitmapC" }}
])
# A: 7 clusters
# B: 4 clusters
# C: 6 clusters
log(query_bitmaps(vm), indent=2)
log('\n--- Submitting & Aborting Merge Transaction ---\n')
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapD",
"disabled": True, "granularity": granularity }},
{ "type": "block-dirty-bitmap-merge",
"data": { "node": "drive0", "target": "bitmapD",
"bitmaps": ["bitmapB", "bitmapC"] }},
{ "type": "abort", "data": {}}
])
log(query_bitmaps(vm), indent=2)
log('\n--- Creating D as a merge of B & C ---\n')
# Good hygiene: create a disabled bitmap as a merge target.
vm.qmp_log("transaction", indent=2, actions=[
{ "type": "block-dirty-bitmap-add",
"data": { "node": "drive0", "name": "bitmapD",
"disabled": True, "granularity": granularity }},
{ "type": "block-dirty-bitmap-merge",
"data": { "node": "drive0", "target": "bitmapD",
"bitmaps": ["bitmapB", "bitmapC"] }}
])
# A and D should now both have 7 clusters apiece.
# B and C remain unchanged with 4 and 6 respectively.
log(query_bitmaps(vm), indent=2)
# A and D should be equivalent.
# Some formats round the size of the disk, so don't print the checksums.
check_a = vm.qmp('x-debug-block-dirty-bitmap-sha256',
node="drive0", name="bitmapA")['return']['sha256']
check_d = vm.qmp('x-debug-block-dirty-bitmap-sha256',
node="drive0", name="bitmapD")['return']['sha256']
assert(check_a == check_d)
log('\n--- Removing bitmaps A, B, C, and D ---\n')
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapA")
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapB")
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapC")
vm.qmp_log("block-dirty-bitmap-remove", node="drive0", name="bitmapD")
log('\n--- Final Query ---\n')
log(query_bitmaps(vm), indent=2)
log('\n--- Done ---\n')
vm.shutdown()
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