1#!/usr/bin/env bash 2# group: rw auto quick 3# 4# Test qemu-nbd -A 5# 6# Copyright (C) 2018-2021 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 22seq="$(basename $0)" 23echo "QA output created by $seq" 24 25status=1 # failure is the default! 26 27_cleanup() 28{ 29 _cleanup_test_img 30 nbd_server_stop 31} 32trap "_cleanup; exit \$status" 0 1 2 3 15 33 34# get standard environment, filters and checks 35cd .. 36. ./common.rc 37. ./common.filter 38. ./common.nbd 39 40_supported_fmt qcow2 41_supported_proto file 42_supported_os Linux 43_require_command QEMU_NBD 44 45echo 46echo "=== Initial image setup ===" 47echo 48 49TEST_IMG="$TEST_IMG.base" _make_test_img 4M 50$QEMU_IO -c 'w 0 2M' -f $IMGFMT "$TEST_IMG.base" | _filter_qemu_io 51_make_test_img -b "$TEST_IMG.base" -F $IMGFMT 4M 52$QEMU_IO -c 'w 1M 2M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io 53 54echo 55echo "=== Check allocation over NBD ===" 56echo 57 58$QEMU_IMG map --output=json -f qcow2 "$TEST_IMG" 59IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket" 60nbd_server_start_unix_socket -r -f qcow2 -A "$TEST_IMG" 61# Inspect what the server is exposing 62$QEMU_NBD --list -k $nbd_unix_socket 63# Normal -f raw NBD block status loses access to allocation information 64$QEMU_IMG map --output=json --image-opts \ 65 "$IMG" | _filter_qemu_img_map 66# But when we use -A, coupled with x-dirty-bitmap in the client for feeding 67# 2-bit block status from an alternative NBD metadata context (note that 68# the client code for x-dirty-bitmap intentionally collapses all depths 69# beyond 2 into a single value), we can determine: 70# unallocated (depth 0) => "zero":false, "data":true 71# local (depth 1) => "zero":false, "data":false 72# backing (depth 2+) => "zero":true, "data":true 73$QEMU_IMG map --output=json --image-opts \ 74 "$IMG,x-dirty-bitmap=qemu:allocation-depth" | _filter_qemu_img_map 75# More accurate results can be obtained by other NBD clients such as 76# libnbd, but this test works without such external dependencies. 77 78# success, all done 79echo '*** done' 80rm -f $seq.full 81status=0 82