78 lines
2.4 KiB
Plaintext
78 lines
2.4 KiB
Plaintext
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#!/usr/bin/env bash
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#
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# Test qemu-nbd -A
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#
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# Copyright (C) 2018-2020 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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seq="$(basename $0)"
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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nbd_server_stop
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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. ./common.nbd
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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_require_command QEMU_NBD
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echo
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echo "=== Initial image setup ==="
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echo
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TEST_IMG="$TEST_IMG.base" _make_test_img 4M
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$QEMU_IO -c 'w 0 2M' -f $IMGFMT "$TEST_IMG.base" | _filter_qemu_io
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_make_test_img -b "$TEST_IMG.base" -F $IMGFMT 4M
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$QEMU_IO -c 'w 1M 2M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io
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echo
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echo "=== Check allocation over NBD ==="
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echo
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$QEMU_IMG map --output=json -f qcow2 "$TEST_IMG"
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IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket"
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nbd_server_start_unix_socket -r -f qcow2 -A "$TEST_IMG"
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# Normal -f raw NBD block status loses access to allocation information
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$QEMU_IMG map --output=json --image-opts \
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"$IMG" | _filter_qemu_img_map
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# But when we use -A, coupled with x-dirty-bitmap in the client for feeding
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# 2-bit block status from an alternative NBD metadata context (note that
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# the client code for x-dirty-bitmap intentionally collapses all depths
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# beyond 2 into a single value), we can determine:
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# unallocated (depth 0) => "zero":false, "data":true
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# local (depth 1) => "zero":false, "data":false
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# backing (depth 2+) => "zero":true, "data":true
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$QEMU_IMG map --output=json --image-opts \
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"$IMG,x-dirty-bitmap=qemu:allocation-depth" | _filter_qemu_img_map
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# More accurate results can be obtained by other NBD clients such as
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# libnbd, but this test works without such external dependencies.
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# success, all done
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echo '*** done'
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rm -f $seq.full
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status=0
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