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Re: [Qemu-devel] [Qemu-block] [PATCH 4/4] iotests: Add test 197 for cove


From: Jeff Cody
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH 4/4] iotests: Add test 197 for covering copy-on-read
Date: Sat, 30 Sep 2017 23:03:57 -0400
User-agent: Mutt/1.5.24 (2015-08-30)

On Sat, Sep 30, 2017 at 03:11:21PM -0500, Eric Blake wrote:
> Add a test for qcow2 copy-on-read behavior, including exposure
> for the just-fixed bugs.
> 
> The copy-on-read behavior is always to a qcow2 image, but the
> test is careful to allow running with most image protocol/format
> combos as the backing file being copied from (luks being the
> exception, as it is harder to pass the right secret to all the
> right places).  In fact, for './check nbd', this appears to be
> the first time we've had a qcow2 image wrapping NBD, requiring
> an additional line in _filter_img_create to match the similar
> line in _filter_img_info.
> 
> Signed-off-by: Eric Blake <address@hidden>
> 
> ---
> I only tested with -raw, -qcow2, -qed, and -nbd. I won't be
> surprised if the test fails in some other setup...
> ---
>  tests/qemu-iotests/common.filter |  1 +
>  tests/qemu-iotests/197           | 93 
> ++++++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/197.out       | 24 +++++++++++
>  tests/qemu-iotests/group         |  1 +
>  4 files changed, 119 insertions(+)
>  create mode 100755 tests/qemu-iotests/197
>  create mode 100644 tests/qemu-iotests/197.out
> 
> diff --git a/tests/qemu-iotests/common.filter 
> b/tests/qemu-iotests/common.filter
> index 9d5442ecd9..227b37e941 100644
> --- a/tests/qemu-iotests/common.filter
> +++ b/tests/qemu-iotests/common.filter
> @@ -111,6 +111,7 @@ _filter_img_create()
>      sed -e "s#$IMGPROTO:$TEST_DIR#TEST_DIR#g" \
>          -e "s#$TEST_DIR#TEST_DIR#g" \
>          -e "s#$IMGFMT#IMGFMT#g" \
> +        -e 's#nbd:127.0.0.1:10810#TEST_DIR/t.IMGFMT#g' \
>          -e "s# encryption=off##g" \
>          -e "s# cluster_size=[0-9]\\+##g" \
>          -e "s# table_size=[0-9]\\+##g" \
> diff --git a/tests/qemu-iotests/197 b/tests/qemu-iotests/197
> new file mode 100755
> index 0000000000..8463e0d1cc
> --- /dev/null
> +++ b/tests/qemu-iotests/197
> @@ -0,0 +1,93 @@
> +#!/bin/bash
> +#
> +# Test case for copy-on-read into qcow2
> +#
> +# Copyright (C) 2017 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/>.
> +#
> +
> +# creator
> address@hidden
> +
> +seq="$(basename $0)"
> +echo "QA output created by $seq"
> +
> +here="$PWD"
> +status=1 # failure is the default!
> +
> +TEST_WRAP="$TEST_DIR/t.wrap.qcow2"
> +BLKDBG_CONF="$TEST_DIR/blkdebug.conf"
> +
> +_cleanup()
> +{
> +    _cleanup_test_img
> +    rm -f "$BLKDBG_CONF"
> +}
> +trap "_cleanup; exit \$status" 0 1 2 3 15


Note to myself to add this to my iotests series.

> +
> +# get standard environment, filters and checks
> +. ./common.rc
> +. ./common.filter
> +
> +# Test is supported for any backing file; but we force qcow2 for our wrapper.
> +_supported_fmt generic
> +_supported_proto generic
> +_supported_os Linux
> +# LUKS support may be possible, but it complicates things.
> +_unsupported_fmt luks
> +
> +echo
> +echo '=== Copy-on-read ==='
> +echo
> +
> +# Prep the images
> +_make_test_img 4G
> +$QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
> +IMGPROTO=file IMGFMT=qcow2 IMGOPTS= TEST_IMG_FILE="$TEST_WRAP" \
> +    _make_test_img -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create
> +$QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io
> +
> +# Ensure that a read of two clusters, but where one is already allocated,
> +# does not re-write the allocated cluster
> +cat > "$BLKDBG_CONF" <<EOF
> +[inject-error]
> +event = "cor_write"
> +sector = "2048"
> +EOF
> +$QEMU_IO -c "open -C \
> + -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \

Hmm, this will lead to issues if $TEST_WRAP has spaces, right?

> + -c "read -P 0 1M 128k" | _filter_qemu_io
> +
> +# Read the areas we want copied. The first read is under 2G, but aligned
> +# so that rounding to clusters copies more than 2G of zeroes. The second
> +# read will pick up the non-zero data in the same cluster
> +$QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
> +    "$TEST_WRAP" | _filter_qemu_io
> +$QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
> +    "$TEST_WRAP" | _filter_qemu_io
> +
> +# Copy-on-read is incompatible with read-only
> +$QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir
> +
> +# Break the backing chain, and show that images are identical, and that
> +# we properly copied over explicit zeros.
> +$QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP"
> +$QEMU_IO -f qcow2 -c map "$TEST_WRAP"
> +_check_test_img
> +$QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP"
> +
> +# success, all done
> +echo '*** done'
> +status=0
> diff --git a/tests/qemu-iotests/197.out b/tests/qemu-iotests/197.out
> new file mode 100644
> index 0000000000..baaa6b69e4
> --- /dev/null
> +++ b/tests/qemu-iotests/197.out
> @@ -0,0 +1,24 @@
> +QA output created by 197
> +
> +=== Copy-on-read ===
> +
> +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296
> +wrote 1024/1024 bytes at offset 3221225472
> +1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +Formatting 'TEST_DIR/t.wrap.IMGFMT', fmt=IMGFMT size=4294967296 
> backing_file=TEST_DIR/t.IMGFMT backing_fmt=IMGFMT
> +wrote 65536/65536 bytes at offset 1048576
> +64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +read 131072/131072 bytes at offset 1048576
> +128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +read 2147483136/2147483136 bytes at offset 1024
> +2 GiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +read 1024/1024 bytes at offset 3221226496
> +1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +can't open device TEST_DIR/t.wrap.qcow2: Can't use copy-on-read on read-only 
> device
> +2 GiB (0x80010000) bytes     allocated at offset 0 bytes (0x0)
> +1023.938 MiB (0x3fff0000) bytes not allocated at offset 2 GiB (0x80010000)
> +64 KiB (0x10000) bytes     allocated at offset 3 GiB (0xc0000000)
> +1023.938 MiB (0x3fff0000) bytes not allocated at offset 3 GiB (0xc0010000)
> +No errors were found on the image.
> +Images are identical.
> +*** done
> diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
> index cdccee319e..7a302a67cf 100644
> --- a/tests/qemu-iotests/group
> +++ b/tests/qemu-iotests/group
> @@ -191,3 +191,4 @@
>  192 rw auto quick
>  194 rw auto migration quick
>  195 rw auto quick
> +197 rw auto quick
> -- 
> 2.13.6
> 
> 



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