30729ae93b
Some tests create huge (but sparse) files, and to be able to run those tests in certain limited environments (like CI containers), we have to check for the possibility to create such files first. Thus let's introduce a common function to check for large files, and replace the already existing checks in the iotests 005 and 220 with this function. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Cleber Rosa <crosa@redhat.com> Tested-by: Cleber Rosa <crosa@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20191204154618.23560-2-thuth@redhat.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
95 lines
3.1 KiB
Bash
Executable file
95 lines
3.1 KiB
Bash
Executable file
#!/usr/bin/env 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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_require_large_file 513T
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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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