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c49dda7254
Fiona reported that ZFS makes sparse file testing awkward, since: - it has asynchronous allocation (not even 'fsync $file' makes du see the desired size; it takes the slower 'fsync -f $file' which is not appropriate for the tests) - for tests of fully allocated files, ZFS with compression enabled still reports smaller disk usage Add a new _require_disk_usage that quickly probes whether an attempt to create a sparse 5M file shows as less than 1M usage, while the same file with -o preallocation=full shows as more than 4M usage without sync, which should filter out ZFS behavior. Then use it in various affected tests. This does not add the new filter on all tests that Fiona is seeing ZFS failures on, but only those where I could quickly spot that there is at least one place where the test depends on the output of 'du -b' or 'stat -c %b'. Reported-by: Fiona Ebner <f.ebner@proxmox.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-ID: <20250523163041.2548675-8-eblake@redhat.com> Reviewed-by: Fiona Ebner <f.ebner@proxmox.com> Tested-by: Fiona Ebner <f.ebner@proxmox.com>
86 lines
2.6 KiB
Bash
Executable file
86 lines
2.6 KiB
Bash
Executable file
#!/usr/bin/env bash
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# group: rw quick
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#
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# Test qemu-img vs. unaligned images; O_DIRECT version
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# (Originates from 221)
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#
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# Copyright (C) 2019 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 $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt raw
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_supported_proto file
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_supported_os Linux
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_default_cache_mode none
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_supported_cache_modes none directsync
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_require_disk_usage
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echo
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echo "=== Check mapping of unaligned raw image ==="
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echo
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# We do not know how large a physical sector is, but it is certainly
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# going to be a factor of 1 MB
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size=$((1 * 1024 * 1024 - 1))
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# qemu-img create rounds size up to BDRV_SECTOR_SIZE
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_make_test_img $size
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$QEMU_IMG map --output=json --image-opts \
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"driver=$IMGFMT,file.driver=file,file.filename=$TEST_IMG,cache.direct=on" \
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| _filter_qemu_img_map
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# so we resize it and check again
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truncate --size=$size "$TEST_IMG"
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$QEMU_IMG map --output=json --image-opts \
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"driver=$IMGFMT,file.driver=file,file.filename=$TEST_IMG,cache.direct=on" \
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| _filter_qemu_img_map
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# qemu-io with O_DIRECT always writes whole physical sectors. Again,
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# we do not know how large a physical sector is, so we just start
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# writing from a 64 kB boundary, which should always be aligned.
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offset=$((1 * 1024 * 1024 - 64 * 1024))
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$QEMU_IO -c "w $offset $((size - offset))" "$TEST_IMG" | _filter_qemu_io
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$QEMU_IMG map --output=json --image-opts \
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"driver=$IMGFMT,file.driver=file,file.filename=$TEST_IMG,cache.direct=on" \
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| _filter_qemu_img_map
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# Resize it and check again -- contrary to 221, we may not get partial
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# sectors here, so there should be only two areas (one zero, one
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# data).
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truncate --size=$size "$TEST_IMG"
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$QEMU_IMG map --output=json --image-opts \
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"driver=$IMGFMT,file.driver=file,file.filename=$TEST_IMG,cache.direct=on" \
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| _filter_qemu_img_map
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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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