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qemu/tests/qemu-iotests/244
Max Reitz 2ec7e8a946 iotests/244: Test preallocation for data-file-raw 
Three test cases:
(1) Adding a qcow2 (metadata) file to an existing data file, see whether
    we can read the existing data through the qcow2 image.
(2) Append data to the data file, grow the qcow2 image accordingly, see
    whether we can read the new data through the qcow2 image.
(3) At runtime, add a backing image to a freshly created qcow2 image
    with an external data file (with data-file-raw).  Reading data from
    the qcow2 image must return the same result as reading data from the
    data file, so everything in the backing image must be ignored.
    (This did not use to be the case, because without the L2 tables
    preallocated, all clusters would appear as unallocated, and so the
    qcow2 driver would fall through to the backing file.)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20210326145509.163455-3-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
2021-03-30 13:02:11 +02:00

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#!/usr/bin/env bash
# group: rw auto quick
#
# Test qcow2 with external data files
#
# Copyright (C) 2019 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
owner=kwolf@redhat.com
seq=$(basename $0)
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
_rm_test_img "$TEST_IMG.data"
_rm_test_img "$TEST_IMG.src"
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.qemu
_supported_fmt qcow2
_supported_proto file
_supported_os Linux
# External data files do not work with compat=0.10, and because we use
# our own external data file, we cannot let the user specify one
_unsupported_imgopts 'compat=0.10' data_file
echo
echo "=== Create and open image with external data file ==="
echo
echo "With data file name in the image:"
_make_test_img -o "data_file=$TEST_IMG.data" 64M
_check_test_img
$QEMU_IO -c "open $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "open -odata-file.filename=$TEST_IMG.data $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "open -odata-file.filename=inexistent $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
echo
echo "Data file required, but without data file name in the image:"
$QEMU_IMG amend -odata_file= $TEST_IMG
$QEMU_IO -c "open $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "open -odata-file.filename=$TEST_IMG.data $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "open -odata-file.filename=inexistent $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
echo
echo "Setting data-file for an image with internal data:"
_make_test_img 64M
$QEMU_IO -c "open -odata-file.filename=$TEST_IMG.data $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
$QEMU_IO -c "open -odata-file.filename=inexistent $TEST_IMG" -c "read -P 0 0 64k" 2>&1 | _filter_qemu_io | _filter_testdir
echo
echo "=== Conflicting features ==="
echo
echo "Convert to compressed target with data file:"
TEST_IMG="$TEST_IMG.src" _make_test_img 64M
$QEMU_IO -c 'write -P 0x11 0 1M' \
-f $IMGFMT "$TEST_IMG.src" |
_filter_qemu_io
$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -c -odata_file="$TEST_IMG.data" \
"$TEST_IMG.src" "$TEST_IMG"
echo
echo "Convert uncompressed, then write compressed data manually:"
$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -odata_file="$TEST_IMG.data" \
"$TEST_IMG.src" "$TEST_IMG"
$QEMU_IMG compare "$TEST_IMG.src" "$TEST_IMG"
$QEMU_IO -c 'write -c -P 0x22 0 1M' \
-f $IMGFMT "$TEST_IMG" |
_filter_qemu_io
_check_test_img
echo
echo "Take an internal snapshot:"
$QEMU_IMG snapshot -c test "$TEST_IMG"
_check_test_img
echo
echo "=== Standalone image with external data file (efficient) ==="
echo
_make_test_img -o "data_file=$TEST_IMG.data" 64M
echo -n "qcow2 file size before I/O: "
du -b $TEST_IMG | cut -f1
# Create image with the following layout
# 0-1 MB: Unallocated
# 1-2 MB: Written (pattern 0x11)
# 2-3 MB: Discarded
# 3-4 MB: Zero write over discarded space
# 4-5 MB: Zero write over written space
# 5-6 MB: Zero write over unallocated space
echo
$QEMU_IO -c 'write -P 0x11 1M 4M' \
-c 'discard 2M 2M' \
-c 'write -z 3M 3M' \
-f $IMGFMT "$TEST_IMG" |
_filter_qemu_io
_check_test_img
echo
$QEMU_IMG map --output=json "$TEST_IMG"
echo
$QEMU_IO -c 'read -P 0 0 1M' \
-c 'read -P 0x11 1M 1M' \
-c 'read -P 0 2M 4M' \
-f $IMGFMT "$TEST_IMG" |
_filter_qemu_io
# Zero clusters are only marked as such in the qcow2 metadata, but contain
# stale data in the external data file
echo
$QEMU_IO -c 'read -P 0 0 1M' \
-c 'read -P 0x11 1M 1M' \
-c 'read -P 0x11 4M 1M' \
-c 'read -P 0 5M 1M' \
-f raw "$TEST_IMG.data" |
_filter_qemu_io
echo -n "qcow2 file size after I/O: "
du -b $TEST_IMG | cut -f1
echo
echo "=== Standalone image with external data file (valid raw) ==="
echo
_make_test_img -o "data_file=$TEST_IMG.data,data_file_raw=on" 64M
echo -n "qcow2 file size before I/O: "
du -b $TEST_IMG | cut -f1
echo
$QEMU_IO -c 'write -P 0x11 1M 4M' \
-c 'discard 2M 2M' \
-c 'write -z 3M 3M' \
-f $IMGFMT "$TEST_IMG" |
_filter_qemu_io
_check_test_img
echo
$QEMU_IMG map --output=json "$TEST_IMG"
echo
$QEMU_IO -c 'read -P 0 0 1M' \
-c 'read -P 0x11 1M 1M' \
-c 'read -P 0 2M 4M' \
-f $IMGFMT "$TEST_IMG" |
_filter_qemu_io
# Discarded clusters are only marked as such in the qcow2 metadata, but
# they can contain stale data in the external data file. Instead, zero
# clusters must be zeroed in the external data file too.
echo
$QEMU_IO -c 'read -P 0 0 1M' \
-c 'read -P 0x11 1M 1M' \
-c 'read -P 0 3M 3M' \
-f raw "$TEST_IMG".data |
_filter_qemu_io
echo -n "qcow2 file size after I/O: "
du -b $TEST_IMG | cut -f1
echo
echo "=== bdrv_co_block_status test for file and offset=0 ==="
echo
_make_test_img -o "data_file=$TEST_IMG.data" 64M
$QEMU_IO -c 'write -P 0x11 0 1M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io
$QEMU_IO -c 'read -P 0x11 0 1M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io
$QEMU_IMG map --output=human "$TEST_IMG" | _filter_testdir
$QEMU_IMG map --output=json "$TEST_IMG"
echo
echo "=== Copy offloading ==="
echo
# Make use of copy offloading if the test host can provide it
_make_test_img -o "data_file=$TEST_IMG.data" 64M
$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n -C "$TEST_IMG.src" "$TEST_IMG"
$QEMU_IMG compare -f $IMGFMT -F $IMGFMT "$TEST_IMG.src" "$TEST_IMG"
# blkdebug doesn't support copy offloading, so this tests the error path
$QEMU_IMG amend -f $IMGFMT -o "data_file=blkdebug::$TEST_IMG.data" "$TEST_IMG"
$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n -C "$TEST_IMG.src" "$TEST_IMG"
$QEMU_IMG compare -f $IMGFMT -F $IMGFMT "$TEST_IMG.src" "$TEST_IMG"
echo
echo "=== Flushing should flush the data file ==="
echo
# We are going to flush a qcow2 file with a blkdebug node inserted
# between the qcow2 node and its data file node. The blkdebug node
# will return an error for all flushes and so we if the data file is
# flushed, we will see qemu-io return an error.
# We need to write something or the flush will not do anything; we
# also need -t writeback so the write is not done as a FUA write
# (which would then fail thanks to the implicit flush)
$QEMU_IO -c 'write 0 512' -c flush \
-t writeback \
"json:{
'driver': 'qcow2',
'file': {
'driver': 'file',
'filename': '$TEST_IMG'
},
'data-file': {
'driver': 'blkdebug',
'inject-error': [{
'event': 'none',
'iotype': 'flush'
}],
'image': {
'driver': 'file',
'filename': '$TEST_IMG.data'
}
}
}" \
| _filter_qemu_io
result=${PIPESTATUS[0]}
echo
case $result in
0)
echo "ERROR: qemu-io succeeded, so the data file was not flushed"
;;
1)
echo "Success: qemu-io failed, so the data file was flushed"
;;
*)
echo "ERROR: qemu-io returned unknown exit code $result"
;;
esac
echo
echo '=== Preallocation with data-file-raw ==='
echo
echo '--- Using a non-zeroed data file ---'
# Using data-file-raw must enforce at least metadata preallocation so
# that it does not matter whether one reads the raw file or the qcow2
# file
# Pre-create the data file, write some data. Real-world use cases for
# this are adding a qcow2 metadata file to a block device (i.e., using
# the device as the data file) or adding qcow2 features to pre-existing
# raw images (e.g. because the user now wants persistent dirty bitmaps).
truncate -s 1M "$TEST_IMG.data"
$QEMU_IO -f raw -c 'write -P 42 0 1M' "$TEST_IMG.data" | _filter_qemu_io
# We cannot use qemu-img to create the qcow2 image, because it would
# clear the data file. Use the blockdev-create job instead, which will
# only format the qcow2 image file.
touch "$TEST_IMG"
_launch_qemu \
-blockdev file,node-name=data,filename="$TEST_IMG.data" \
-blockdev file,node-name=meta,filename="$TEST_IMG"
_send_qemu_cmd $QEMU_HANDLE '{ "execute": "qmp_capabilities" }' 'return'
_send_qemu_cmd $QEMU_HANDLE \
'{ "execute": "blockdev-create",
"arguments": {
"job-id": "create",
"options": {
"driver": "qcow2",
"size": '"$((1 * 1024 * 1024))"',
"file": "meta",
"data-file": "data",
"data-file-raw": true
} } }' \
'"status": "concluded"'
_send_qemu_cmd $QEMU_HANDLE \
'{ "execute": "job-dismiss", "arguments": { "id": "create" } }' \
'return'
_cleanup_qemu
echo
echo 'Comparing pattern:'
# Reading from either the qcow2 file or the data file should return
# the same result:
$QEMU_IO -f raw -c 'read -P 42 0 1M' "$TEST_IMG.data" | _filter_qemu_io
$QEMU_IO -f $IMGFMT -c 'read -P 42 0 1M' "$TEST_IMG" | _filter_qemu_io
# For good measure
$QEMU_IMG compare -f raw "$TEST_IMG.data" "$TEST_IMG"
echo
echo '--- Truncation (growing) ---'
# Append some new data to the raw file, then resize the qcow2 image
# accordingly and see whether the new data is visible. Technically
# that is not allowed, but it is reasonable behavior, so test it.
truncate -s 2M "$TEST_IMG.data"
$QEMU_IO -f raw -c 'write -P 84 1M 1M' "$TEST_IMG.data" | _filter_qemu_io
$QEMU_IMG resize "$TEST_IMG" 2M
echo
echo 'Comparing pattern:'
$QEMU_IO -f raw -c 'read -P 42 0 1M' -c 'read -P 84 1M 1M' "$TEST_IMG.data" \
| _filter_qemu_io
$QEMU_IO -f $IMGFMT -c 'read -P 42 0 1M' -c 'read -P 84 1M 1M' "$TEST_IMG" \
| _filter_qemu_io
$QEMU_IMG compare -f raw "$TEST_IMG.data" "$TEST_IMG"
echo
echo '--- Giving a backing file at runtime ---'
# qcow2 files with data-file-raw cannot have backing files given by
# their image header, but qemu will allow you to set a backing node at
# runtime -- it should not have any effect, though (because reading
# from the qcow2 node should return the same data as reading from the
# raw node).
_make_test_img -o "data_file=$TEST_IMG.data,data_file_raw=on" 1M
TEST_IMG="$TEST_IMG.base" _make_test_img 1M
# Write something that is not zero into the base image
$QEMU_IO -c 'write -P 42 0 1M' "$TEST_IMG.base" | _filter_qemu_io
echo
echo 'Comparing qcow2 image and raw data file:'
# $TEST_IMG and $TEST_IMG.data must show the same data at all times;
# that is, the qcow2 node must not fall through to the backing image
# at any point
$QEMU_IMG compare --image-opts \
"driver=raw,file.filename=$TEST_IMG.data" \
"file.filename=$TEST_IMG,backing.file.filename=$TEST_IMG.base"
# success, all done
echo "*** done"
rm -f $seq.full
status=0
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