iotests: Copy 197 for COR filter driver

#!/bin/bash

#

# Test case for copy-on-read into qcow2, using the COR filter driver

#

# Copyright (C) 2018 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/>.

#

seq="$(basename $0)"

echo "QA output created by $seq"

here="$PWD"

status=1 # failure is the default!

# get standard environment, filters and checks

. ./common.rc

. ./common.filter

TEST_WRAP="$TEST_DIR/t.wrap.qcow2"

BLKDBG_CONF="$TEST_DIR/blkdebug.conf"

# Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces

# or other problems

case "$TEST_DIR" in

    *[^-_a-zA-Z0-9/]*)

        _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;

esac

_cleanup()

{

    _cleanup_test_img

    rm -f "$TEST_WRAP"

    rm -f "$BLKDBG_CONF"

}

trap "_cleanup; exit \$status" 0 1 2 3 15

# 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

# VPC rounds image sizes to a specific geometry, force a specific size.

if [ "$IMGFMT" = "vpc" ]; then

    IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size")

fi

_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 \

 -o driver=copy-on-read,file.driver=blkdebug,file.config=$BLKDBG_CONF,file.image.driver=qcow2 $TEST_WRAP" \

 -c "read -P 0 1M 128k" | _filter_qemu_io

# Read the areas we want copied. A zero-length read should still be a

# no-op.  The next read is under 2G, but aligned so that rounding to

# clusters copies more than 2G of zeroes. The final read will pick up

# the non-zero data in the same cluster.  Since a 2G read may exhaust

# memory on some machines (particularly 32-bit), we skip the test if

# that fails due to memory pressure.

$QEMU_IO \

    -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \

    -c "read 0 0" \

    | _filter_qemu_io

output=$($QEMU_IO \

         -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \

         -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \

         2>&1 | _filter_qemu_io)

case $output in

    *allocate*)

        _notrun "Insufficent memory to run test" ;;

    *) printf '%s\n' "$output" ;;

esac

$QEMU_IO \

    -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \

    -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \

    | _filter_qemu_io

# Copy-on-read is incompatible with read-only

$QEMU_IO \

    -c "open -r -o driver=copy-on-read,file.driver=qcow2 $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

QA output created by 215

=== 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 0/0 bytes at offset 0

0 bytes, 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: Block node is read-only

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

212 rw auto quick

213 rw auto quick

214 rw auto

215 rw auto quick

218 rw auto quick