| #!/usr/bin/env bash | |
| # group: rw | |
| # | |
| # Test cases for different refcount_bits values | |
| # | |
| # Copyright (C) 2015 Red Hat, Inc. | |
| # | |
| # This program is free software; you can redistribute it and/or modify | |
| # it under the terms of the GNU General Public License as published by | |
| # the Free Software Foundation; either version 2 of the License, or | |
| # (at your option) any later version. | |
| # | |
| # This program is distributed in the hope that it will be useful, | |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| # GNU General Public License for more details. | |
| # | |
| # You should have received a copy of the GNU General Public License | |
| # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| # | |
| # creator | |
| owner=hreitz@redhat.com | |
| seq="$(basename $0)" | |
| echo "QA output created by $seq" | |
| status=1 # failure is the default! | |
| _cleanup() | |
| { | |
| _cleanup_test_img | |
| } | |
| trap "_cleanup; exit \$status" 0 1 2 3 15 | |
| # get standard environment, filters and checks | |
| . ./common.rc | |
| . ./common.filter | |
| # This tests qcow2-specific low-level functionality | |
| _supported_fmt qcow2 | |
| _supported_proto file fuse | |
| # This test will set refcount_bits on its own which would conflict with the | |
| # manual setting; compat will be overridden as well; | |
| # and external data files do not work well with our refcount testing | |
| # also, compression type is not supported with compat=0.10 used in test | |
| _unsupported_imgopts refcount_bits 'compat=0.10' data_file compression_type | |
| print_refcount_bits() | |
| { | |
| $QEMU_IMG info "$TEST_IMG" | sed -n '/refcount bits:/ s/^ *//p' | |
| } | |
| echo | |
| echo '=== refcount_bits limits ===' | |
| echo | |
| # Must be positive (non-zero) | |
| _make_test_img -o "refcount_bits=0" 64M | |
| # Must be positive (non-negative) | |
| _make_test_img -o "refcount_bits=-1" 64M | |
| # May not exceed 64 | |
| _make_test_img -o "refcount_bits=128" 64M | |
| # Must be a power of two | |
| _make_test_img -o "refcount_bits=42" 64M | |
| # 1 is the minimum | |
| _make_test_img -o "refcount_bits=1" 64M | |
| print_refcount_bits | |
| # 64 is the maximum | |
| _make_test_img -o "refcount_bits=64" 64M | |
| print_refcount_bits | |
| # 16 is the default | |
| _make_test_img 64M | |
| print_refcount_bits | |
| echo | |
| echo '=== refcount_bits and compat=0.10 ===' | |
| echo | |
| # Should work | |
| _make_test_img -o "compat=0.10,refcount_bits=16" 64M | |
| print_refcount_bits | |
| # Should not work | |
| _make_test_img -o "compat=0.10,refcount_bits=1" 64M | |
| _make_test_img -o "compat=0.10,refcount_bits=64" 64M | |
| echo | |
| echo '=== Snapshot limit on refcount_bits=1 ===' | |
| echo | |
| _make_test_img -o "refcount_bits=1" 64M | |
| print_refcount_bits | |
| $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
| # Should fail for now; in the future, this might be supported by automatically | |
| # copying all clusters with overflowing refcount | |
| $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
| # The new L1 table could/should be leaked | |
| _check_test_img | |
| echo | |
| echo '=== Snapshot limit on refcount_bits=2 ===' | |
| echo | |
| _make_test_img -o "refcount_bits=2" 64M | |
| print_refcount_bits | |
| $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
| # Should succeed | |
| $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
| $QEMU_IMG snapshot -c bar "$TEST_IMG" | |
| # Should fail (4th reference) | |
| $QEMU_IMG snapshot -c baz "$TEST_IMG" | |
| # The new L1 table could/should be leaked | |
| _check_test_img | |
| echo | |
| echo '=== Compressed clusters with refcount_bits=1 ===' | |
| echo | |
| _make_test_img -o "refcount_bits=1" 64M | |
| print_refcount_bits | |
| # Both should fit into a single host cluster; instead of failing to increase the | |
| # refcount of that cluster, qemu should just allocate a new cluster and make | |
| # this operation succeed | |
| $QEMU_IO -c 'write -P 0 -c 0 64k' \ | |
| -c 'write -P 1 -c 64k 64k' \ | |
| "$TEST_IMG" | _filter_qemu_io | |
| _check_test_img | |
| echo | |
| echo '=== MSb set in 64 bit refcount ===' | |
| echo | |
| _make_test_img -o "refcount_bits=64" 64M | |
| print_refcount_bits | |
| $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
| # Set the MSb in the refblock entry of the data cluster | |
| poke_file "$TEST_IMG" $((0x20028)) "\x80\x00\x00\x00\x00\x00\x00\x00" | |
| # Clear OFLAG_COPIED in the L2 entry of the data cluster | |
| poke_file "$TEST_IMG" $((0x40000)) "\x00\x00\x00\x00\x00\x05\x00\x00" | |
| # Try to write to that cluster (should work, even though the MSb is set) | |
| $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
| echo | |
| echo '=== Snapshot on maximum 64 bit refcount value ===' | |
| echo | |
| _make_test_img -o "refcount_bits=64" 64M | |
| print_refcount_bits | |
| $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
| # Set the refblock entry to the maximum value possible | |
| poke_file "$TEST_IMG" $((0x20028)) "\xff\xff\xff\xff\xff\xff\xff\xff" | |
| # Clear OFLAG_COPIED in the L2 entry of the data cluster | |
| poke_file "$TEST_IMG" $((0x40000)) "\x00\x00\x00\x00\x00\x05\x00\x00" | |
| # Try a snapshot (should correctly identify the overflow; may work in the future | |
| # by falling back to COW) | |
| $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
| # The new L1 table could/should be leaked; and obviously the data cluster is | |
| # leaked (refcount=UINT64_MAX reference=1) | |
| _check_test_img | |
| echo | |
| echo '=== Amend from refcount_bits=16 to refcount_bits=1 ===' | |
| echo | |
| _make_test_img 64M | |
| print_refcount_bits | |
| $QEMU_IO -c 'write 16M 32M' "$TEST_IMG" | _filter_qemu_io | |
| $QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG" | |
| _check_test_img | |
| print_refcount_bits | |
| echo | |
| echo '=== Amend from refcount_bits=1 to refcount_bits=64 ===' | |
| echo | |
| $QEMU_IMG amend -o refcount_bits=64 "$TEST_IMG" | |
| _check_test_img | |
| print_refcount_bits | |
| echo | |
| echo '=== Amend to compat=0.10 ===' | |
| echo | |
| # Should not work because refcount_bits needs to be 16 for compat=0.10 | |
| $QEMU_IMG amend -o compat=0.10 "$TEST_IMG" | |
| print_refcount_bits | |
| # Should work | |
| $QEMU_IMG amend -o compat=0.10,refcount_bits=16 "$TEST_IMG" | |
| _check_test_img | |
| print_refcount_bits | |
| # Get back to compat=1.1 and refcount_bits=16 | |
| $QEMU_IMG amend -o compat=1.1 "$TEST_IMG" | |
| print_refcount_bits | |
| # Should not work | |
| $QEMU_IMG amend -o refcount_bits=32,compat=0.10 "$TEST_IMG" | |
| print_refcount_bits | |
| echo | |
| echo '=== Amend with snapshot ===' | |
| echo | |
| $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
| # Just to have different refcounts across the image | |
| $QEMU_IO -c 'write 0 16M' "$TEST_IMG" | _filter_qemu_io | |
| # Should not work (may work in the future by first decreasing all refcounts so | |
| # they fit into the target range by copying them) | |
| $QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG" | |
| _check_test_img | |
| print_refcount_bits | |
| # Should work | |
| $QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG" | |
| _check_test_img | |
| print_refcount_bits | |
| echo | |
| echo '=== Testing too many references for check ===' | |
| echo | |
| _make_test_img -o "refcount_bits=1" 64M | |
| print_refcount_bits | |
| # This cluster should be created at 0x50000 | |
| $QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io | |
| # Now make the second L2 entry (the L2 table should be at 0x40000) point to that | |
| # cluster, so we have two references | |
| poke_file "$TEST_IMG" $((0x40008)) "\x80\x00\x00\x00\x00\x05\x00\x00" | |
| # This should say "please use amend" | |
| _check_test_img -r all | |
| # So we do that | |
| $QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG" | |
| print_refcount_bits | |
| # And try again | |
| _check_test_img -r all | |
| echo | |
| echo '=== Multiple walks necessary during amend ===' | |
| echo | |
| _make_test_img -o "refcount_bits=1,cluster_size=512" 64k | |
| # Cluster 0 is the image header, clusters 1 to 4 are used by the L1 table, a | |
| # single L2 table, the reftable and a single refblock. This creates 58 data | |
| # clusters (actually, the L2 table is created here, too), so in total there are | |
| # then 63 used clusters in the image. With a refcount width of 64, one refblock | |
| # describes 64 clusters (512 bytes / 64 bits/entry = 64 entries), so this will | |
| # make the first refblock in the amended image have exactly one free entry. | |
| $QEMU_IO -c "write 0 $((58 * 512))" "$TEST_IMG" | _filter_qemu_io | |
| # Now change the refcount width; since the first new refblock will have exactly | |
| # one free entry, that entry will be used to store its own reference. No other | |
| # refblocks are needed, so then the new reftable will be allocated; since the | |
| # first new refblock is completely filled up, this will require a new refblock | |
| # which is why the refcount width changing function will need to run through | |
| # everything one more time until the allocations are stable. | |
| # Having more walks than usual should be visible as regressing progress (from | |
| # 66.67 % (2/3 walks) to 50.00 % (2/4 walks)). | |
| $QEMU_IMG amend -o refcount_bits=64 -p "$TEST_IMG" | tr '\r' '\n' \ | |
| | grep -A 1 '66.67' | |
| print_refcount_bits | |
| _check_test_img | |
| # success, all done | |
| echo '*** done' | |
| rm -f $seq.full | |
| status=0 |