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Add a test for errors specific to certain widths (i.e. snapshots with refcount_bits=1). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
188 lines
4.9 KiB
Bash
Executable File
188 lines
4.9 KiB
Bash
Executable File
#!/bin/bash
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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=mreitz@redhat.com
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seq="$(basename $0)"
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echo "QA output created by $seq"
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here="$PWD"
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tmp=/tmp/$$
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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
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_supported_os Linux
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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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_unsupported_imgopts refcount_bits 'compat=0.10'
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function 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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IMGOPTS="$IMGOPTS,refcount_bits=0" _make_test_img 64M
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# Must be positive (non-negative)
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IMGOPTS="$IMGOPTS,refcount_bits=-1" _make_test_img 64M
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# May not exceed 64
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IMGOPTS="$IMGOPTS,refcount_bits=128" _make_test_img 64M
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# Must be a power of two
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IMGOPTS="$IMGOPTS,refcount_bits=42" _make_test_img 64M
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# 1 is the minimum
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IMGOPTS="$IMGOPTS,refcount_bits=1" _make_test_img 64M
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print_refcount_bits
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# 64 is the maximum
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IMGOPTS="$IMGOPTS,refcount_bits=64" _make_test_img 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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IMGOPTS="$IMGOPTS,compat=0.10,refcount_bits=16" _make_test_img 64M
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print_refcount_bits
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# Should not work
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IMGOPTS="$IMGOPTS,compat=0.10,refcount_bits=1" _make_test_img 64M
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IMGOPTS="$IMGOPTS,compat=0.10,refcount_bits=64" _make_test_img 64M
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echo
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echo '=== Snapshot limit on refcount_bits=1 ==='
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echo
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IMGOPTS="$IMGOPTS,refcount_bits=1" _make_test_img 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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IMGOPTS="$IMGOPTS,refcount_bits=2" _make_test_img 64M
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print_refcount_bits
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$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 "$TEST_IMG"
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# The new L1 table could/should be leaked
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_check_test_img
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echo
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echo '=== Compressed clusters with refcount_bits=1 ==='
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echo
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IMGOPTS="$IMGOPTS,refcount_bits=1" _make_test_img 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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IMGOPTS="$IMGOPTS,refcount_bits=64" _make_test_img 64M
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print_refcount_bits
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$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' "$TEST_IMG" | _filter_qemu_io
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echo
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echo '=== Snapshot on maximum 64 bit refcount value ==='
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echo
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IMGOPTS="$IMGOPTS,refcount_bits=64" _make_test_img 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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# 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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