| #!/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 |