diff --git a/tests/qemu-iotests/220 b/tests/qemu-iotests/220 new file mode 100755 index 0000000000..0c5682bda0 --- /dev/null +++ b/tests/qemu-iotests/220 @@ -0,0 +1,96 @@ +#!/bin/bash +# +# max limits on compression in huge qcow2 files +# +# 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 . +# + +seq=$(basename $0) +echo "QA output created by $seq" + +status=1 # failure is the default! + +_cleanup() +{ + _cleanup_test_img +} +trap "_cleanup; exit \$status" 0 1 2 3 15 + +# get standard environment, filters and checks +. ./common.rc +. ./common.filter +. ./common.pattern + +_supported_fmt qcow2 +_supported_proto file +_supported_os Linux + +echo "== Creating huge file ==" + +# Sanity check: We require a file system that permits the creation +# of a HUGE (but very sparse) file. tmpfs works, ext4 does not. +if ! truncate --size=513T "$TEST_IMG"; then + _notrun "file system on $TEST_DIR does not support large enough files" +fi +rm "$TEST_IMG" +IMGOPTS='cluster_size=2M,refcount_bits=1' _make_test_img 513T + +echo "== Populating refcounts ==" +# We want an image with 256M refcounts * 2M clusters = 512T referenced. +# Each 2M cluster holds 16M refcounts; the refcount table initially uses +# 1 refblock, so we need to add 15 more. The refcount table lives at 2M, +# first refblock at 4M, L2 at 6M, so our remaining additions start at 8M. +# Then, for each refblock, mark it as fully populated. +to_hex() { + printf %016x\\n $1 | sed 's/\(..\)/\\x\1/g' +} +truncate --size=38m "$TEST_IMG" +entry=$((0x200000)) +$QEMU_IO_PROG -f raw -c "w -P 0xff 4m 2m" "$TEST_IMG" | _filter_qemu_io +for i in {1..15}; do + offs=$((0x600000 + i*0x200000)) + poke_file "$TEST_IMG" $((i*8 + entry)) $(to_hex $offs) + $QEMU_IO_PROG -f raw -c "w -P 0xff $offs 2m" "$TEST_IMG" | _filter_qemu_io +done + +echo "== Checking file before ==" +# FIXME: 'qemu-img check' doesn't diagnose refcounts beyond the end of +# the file as leaked clusters +_check_test_img 2>&1 | sed '/^Leaked cluster/d' +stat -c 'image size %s' "$TEST_IMG" + +echo "== Trying to write compressed cluster ==" +# Given our file size, the next available cluster at 512T lies beyond the +# maximum offset that a compressed 2M cluster can reside in +$QEMU_IO_PROG -c 'w -c 0 2m' "$TEST_IMG" | _filter_qemu_io +# The attempt failed, but ended up allocating a new refblock +stat -c 'image size %s' "$TEST_IMG" + +echo "== Writing normal cluster ==" +# The failed write should not corrupt the image, so a normal write succeeds +$QEMU_IO_PROG -c 'w 0 2m' "$TEST_IMG" | _filter_qemu_io + +echo "== Checking file after ==" +# qemu-img now sees the millions of leaked clusters, thanks to the allocations +# at 512T. Undo many of our faked references to speed up the check. +$QEMU_IO_PROG -f raw -c "w -z 5m 1m" -c "w -z 8m 30m" "$TEST_IMG" | + _filter_qemu_io +_check_test_img 2>&1 | sed '/^Leaked cluster/d' + +# success, all done +echo "*** done" +rm -f $seq.full +status=0 diff --git a/tests/qemu-iotests/220.out b/tests/qemu-iotests/220.out new file mode 100644 index 0000000000..af3021fd88 --- /dev/null +++ b/tests/qemu-iotests/220.out @@ -0,0 +1,54 @@ +QA output created by 220 +== Creating huge file == +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=564049465049088 +== Populating refcounts == +wrote 2097152/2097152 bytes at offset 4194304 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 8388608 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 10485760 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 12582912 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 14680064 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 16777216 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 18874368 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 20971520 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 23068672 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 25165824 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 27262976 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 29360128 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 31457280 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 33554432 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 35651584 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 2097152/2097152 bytes at offset 37748736 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +== Checking file before == +No errors were found on the image. +image size 39845888 +== Trying to write compressed cluster == +write failed: Input/output error +image size 562949957615616 +== Writing normal cluster == +wrote 2097152/2097152 bytes at offset 0 +2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +== Checking file after == +wrote 1048576/1048576 bytes at offset 5242880 +1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 31457280/31457280 bytes at offset 8388608 +30 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) + +8388589 leaked clusters were found on the image. +This means waste of disk space, but no harm to data. +*** done diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group index ebe4fe78bc..4d194716f2 100644 --- a/tests/qemu-iotests/group +++ b/tests/qemu-iotests/group @@ -219,6 +219,7 @@ 217 rw auto quick 218 rw auto quick 219 rw auto +220 rw auto 221 rw auto quick 222 rw auto quick 223 rw auto quick