97 lines
3.2 KiB
Plaintext
97 lines
3.2 KiB
Plaintext
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#!/bin/bash
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#
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# max limits on compression in huge qcow2 files
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#
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# Copyright (C) 2018 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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seq=$(basename $0)
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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. ./common.pattern
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_supported_fmt qcow2
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_supported_proto file
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_supported_os Linux
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echo "== Creating huge file =="
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# Sanity check: We require a file system that permits the creation
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# of a HUGE (but very sparse) file. tmpfs works, ext4 does not.
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if ! truncate --size=513T "$TEST_IMG"; then
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_notrun "file system on $TEST_DIR does not support large enough files"
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fi
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rm "$TEST_IMG"
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IMGOPTS='cluster_size=2M,refcount_bits=1' _make_test_img 513T
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echo "== Populating refcounts =="
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# We want an image with 256M refcounts * 2M clusters = 512T referenced.
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# Each 2M cluster holds 16M refcounts; the refcount table initially uses
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# 1 refblock, so we need to add 15 more. The refcount table lives at 2M,
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# first refblock at 4M, L2 at 6M, so our remaining additions start at 8M.
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# Then, for each refblock, mark it as fully populated.
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to_hex() {
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printf %016x\\n $1 | sed 's/\(..\)/\\x\1/g'
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}
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truncate --size=38m "$TEST_IMG"
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entry=$((0x200000))
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$QEMU_IO_PROG -f raw -c "w -P 0xff 4m 2m" "$TEST_IMG" | _filter_qemu_io
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for i in {1..15}; do
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offs=$((0x600000 + i*0x200000))
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poke_file "$TEST_IMG" $((i*8 + entry)) $(to_hex $offs)
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$QEMU_IO_PROG -f raw -c "w -P 0xff $offs 2m" "$TEST_IMG" | _filter_qemu_io
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done
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echo "== Checking file before =="
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# FIXME: 'qemu-img check' doesn't diagnose refcounts beyond the end of
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# the file as leaked clusters
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_check_test_img 2>&1 | sed '/^Leaked cluster/d'
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stat -c 'image size %s' "$TEST_IMG"
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echo "== Trying to write compressed cluster =="
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# Given our file size, the next available cluster at 512T lies beyond the
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# maximum offset that a compressed 2M cluster can reside in
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$QEMU_IO_PROG -c 'w -c 0 2m' "$TEST_IMG" | _filter_qemu_io
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# The attempt failed, but ended up allocating a new refblock
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stat -c 'image size %s' "$TEST_IMG"
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echo "== Writing normal cluster =="
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# The failed write should not corrupt the image, so a normal write succeeds
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$QEMU_IO_PROG -c 'w 0 2m' "$TEST_IMG" | _filter_qemu_io
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echo "== Checking file after =="
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# qemu-img now sees the millions of leaked clusters, thanks to the allocations
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# at 512T. Undo many of our faked references to speed up the check.
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$QEMU_IO_PROG -f raw -c "w -z 5m 1m" -c "w -z 8m 30m" "$TEST_IMG" |
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_filter_qemu_io
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_check_test_img 2>&1 | sed '/^Leaked cluster/d'
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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