| #!/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 |
| owner=eblake@redhat.com |
| |
| 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='$TEST_DIR', cowardly refusing to run" ;; |
| esac |
| |
| _cleanup() |
| { |
| _cleanup_test_img |
| rm -f "$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 |
| $QEMU_IO -c "open -C \ |
| -o driver=blkdebug,config=$BLKDBG_CONF,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. |
| $QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io |
| output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \ |
| "$TEST_WRAP" 2>&1 | _filter_qemu_io) |
| case $output in |
| *allocate*) |
| _notrun "Insufficent memory to run test" ;; |
| *) printf '%s\n' "$output" ;; |
| esac |
| $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 |