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297 lines
8.2 KiB
Bash
297 lines
8.2 KiB
Bash
#!/usr/bin/env bash
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# group: rw
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#
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# Test cases for different refcount_bits values
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#
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# Copyright (C) 2015 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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# creator
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owner=hreitz@redhat.com
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seq="$(basename $0)"
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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# This tests qcow2-specific low-level functionality
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_supported_fmt qcow2
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_supported_proto file fuse
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# This test will set refcount_bits on its own which would conflict with the
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# manual setting; compat will be overridden as well;
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# and external data files do not work well with our refcount testing
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# also, compression type is not supported with compat=0.10 used in test
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_unsupported_imgopts refcount_bits 'compat=0.10' data_file compression_type
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print_refcount_bits()
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{
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$QEMU_IMG info "$TEST_IMG" | sed -n '/refcount bits:/ s/^ *//p'
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}
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echo
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echo '=== refcount_bits limits ==='
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echo
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# Must be positive (non-zero)
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_make_test_img -o "refcount_bits=0" 64M
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# Must be positive (non-negative)
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_make_test_img -o "refcount_bits=-1" 64M
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# May not exceed 64
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_make_test_img -o "refcount_bits=128" 64M
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# Must be a power of two
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_make_test_img -o "refcount_bits=42" 64M
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# 1 is the minimum
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_make_test_img -o "refcount_bits=1" 64M
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print_refcount_bits
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# 64 is the maximum
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_make_test_img -o "refcount_bits=64" 64M
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print_refcount_bits
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# 16 is the default
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_make_test_img 64M
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print_refcount_bits
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echo
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echo '=== refcount_bits and compat=0.10 ==='
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echo
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# Should work
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_make_test_img -o "compat=0.10,refcount_bits=16" 64M
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print_refcount_bits
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# Should not work
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_make_test_img -o "compat=0.10,refcount_bits=1" 64M
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_make_test_img -o "compat=0.10,refcount_bits=64" 64M
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echo
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echo '=== Snapshot limit on refcount_bits=1 ==='
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echo
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_make_test_img -o "refcount_bits=1" 64M
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print_refcount_bits
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$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
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# Should fail for now; in the future, this might be supported by automatically
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# copying all clusters with overflowing refcount
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$QEMU_IMG snapshot -c foo "$TEST_IMG"
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# The new L1 table could/should be leaked
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_check_test_img
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echo
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echo '=== Snapshot limit on refcount_bits=2 ==='
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echo
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_make_test_img -o "refcount_bits=2" 64M
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print_refcount_bits
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$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
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# Should succeed
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$QEMU_IMG snapshot -c foo "$TEST_IMG"
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$QEMU_IMG snapshot -c bar "$TEST_IMG"
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# Should fail (4th reference)
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$QEMU_IMG snapshot -c baz "$TEST_IMG"
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# The new L1 table could/should be leaked
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_check_test_img
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echo
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echo '=== Compressed clusters with refcount_bits=1 ==='
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echo
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_make_test_img -o "refcount_bits=1" 64M
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print_refcount_bits
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# Both should fit into a single host cluster; instead of failing to increase the
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# refcount of that cluster, qemu should just allocate a new cluster and make
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# this operation succeed
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$QEMU_IO -c 'write -P 0 -c 0 64k' \
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-c 'write -P 1 -c 64k 64k' \
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"$TEST_IMG" | _filter_qemu_io
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_check_test_img
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echo
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echo '=== MSb set in 64 bit refcount ==='
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echo
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_make_test_img -o "refcount_bits=64" 64M
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print_refcount_bits
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$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
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# Set the MSb in the refblock entry of the data cluster
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poke_file "$TEST_IMG" $((0x20028)) "\x80\x00\x00\x00\x00\x00\x00\x00"
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# Clear OFLAG_COPIED in the L2 entry of the data cluster
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poke_file "$TEST_IMG" $((0x40000)) "\x00\x00\x00\x00\x00\x05\x00\x00"
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# Try to write to that cluster (should work, even though the MSb is set)
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$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
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echo
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echo '=== Snapshot on maximum 64 bit refcount value ==='
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echo
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_make_test_img -o "refcount_bits=64" 64M
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print_refcount_bits
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$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
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# Set the refblock entry to the maximum value possible
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poke_file "$TEST_IMG" $((0x20028)) "\xff\xff\xff\xff\xff\xff\xff\xff"
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# Clear OFLAG_COPIED in the L2 entry of the data cluster
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poke_file "$TEST_IMG" $((0x40000)) "\x00\x00\x00\x00\x00\x05\x00\x00"
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# Try a snapshot (should correctly identify the overflow; may work in the future
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# by falling back to COW)
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$QEMU_IMG snapshot -c foo "$TEST_IMG"
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# The new L1 table could/should be leaked; and obviously the data cluster is
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# leaked (refcount=UINT64_MAX reference=1)
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_check_test_img
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echo
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echo '=== Amend from refcount_bits=16 to refcount_bits=1 ==='
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echo
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_make_test_img 64M
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print_refcount_bits
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$QEMU_IO -c 'write 16M 32M' "$TEST_IMG" | _filter_qemu_io
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$QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG"
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_check_test_img
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print_refcount_bits
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echo
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echo '=== Amend from refcount_bits=1 to refcount_bits=64 ==='
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echo
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$QEMU_IMG amend -o refcount_bits=64 "$TEST_IMG"
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_check_test_img
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print_refcount_bits
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echo
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echo '=== Amend to compat=0.10 ==='
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echo
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# Should not work because refcount_bits needs to be 16 for compat=0.10
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$QEMU_IMG amend -o compat=0.10 "$TEST_IMG"
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print_refcount_bits
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# Should work
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$QEMU_IMG amend -o compat=0.10,refcount_bits=16 "$TEST_IMG"
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_check_test_img
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print_refcount_bits
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# Get back to compat=1.1 and refcount_bits=16
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$QEMU_IMG amend -o compat=1.1 "$TEST_IMG"
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print_refcount_bits
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# Should not work
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$QEMU_IMG amend -o refcount_bits=32,compat=0.10 "$TEST_IMG"
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print_refcount_bits
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echo
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echo '=== Amend with snapshot ==='
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echo
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$QEMU_IMG snapshot -c foo "$TEST_IMG"
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# Just to have different refcounts across the image
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$QEMU_IO -c 'write 0 16M' "$TEST_IMG" | _filter_qemu_io
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# Should not work (may work in the future by first decreasing all refcounts so
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# they fit into the target range by copying them)
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$QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG"
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_check_test_img
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print_refcount_bits
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# Should work
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$QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG"
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_check_test_img
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print_refcount_bits
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echo
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echo '=== Testing too many references for check ==='
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echo
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_make_test_img -o "refcount_bits=1" 64M
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print_refcount_bits
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# This cluster should be created at 0x50000
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$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
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# Now make the second L2 entry (the L2 table should be at 0x40000) point to that
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# cluster, so we have two references
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poke_file "$TEST_IMG" $((0x40008)) "\x80\x00\x00\x00\x00\x05\x00\x00"
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# This should say "please use amend"
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_check_test_img -r all
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# So we do that
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$QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG"
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print_refcount_bits
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# And try again
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_check_test_img -r all
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echo
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echo '=== Multiple walks necessary during amend ==='
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echo
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_make_test_img -o "refcount_bits=1,cluster_size=512" 64k
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# Cluster 0 is the image header, clusters 1 to 4 are used by the L1 table, a
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# single L2 table, the reftable and a single refblock. This creates 58 data
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# clusters (actually, the L2 table is created here, too), so in total there are
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# then 63 used clusters in the image. With a refcount width of 64, one refblock
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# describes 64 clusters (512 bytes / 64 bits/entry = 64 entries), so this will
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# make the first refblock in the amended image have exactly one free entry.
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$QEMU_IO -c "write 0 $((58 * 512))" "$TEST_IMG" | _filter_qemu_io
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# Now change the refcount width; since the first new refblock will have exactly
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# one free entry, that entry will be used to store its own reference. No other
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# refblocks are needed, so then the new reftable will be allocated; since the
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# first new refblock is completely filled up, this will require a new refblock
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# which is why the refcount width changing function will need to run through
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# everything one more time until the allocations are stable.
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# Having more walks than usual should be visible as regressing progress (from
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# 66.67 % (2/3 walks) to 50.00 % (2/4 walks)).
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$QEMU_IMG amend -o refcount_bits=64 -p "$TEST_IMG" | tr '\r' '\n' \
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| grep -A 1 '66.67'
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print_refcount_bits
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_check_test_img
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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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