| 1 | #!/usr/bin/env bash |
| 2 | # group: rw backing quick |
| 3 | # |
| 4 | # Test large write to a qcow2 image |
| 5 | # |
| 6 | # Copyright (C) 2019 Red Hat, Inc. |
| 7 | # |
| 8 | # This program is free software; you can redistribute it and/or modify |
| 9 | # it under the terms of the GNU General Public License as published by |
| 10 | # the Free Software Foundation; either version 2 of the License, or |
| 11 | # (at your option) any later version. |
| 12 | # |
| 13 | # This program is distributed in the hope that it will be useful, |
| 14 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | # GNU General Public License for more details. |
| 17 | # |
| 18 | # You should have received a copy of the GNU General Public License |
| 19 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | # |
| 21 | |
| 22 | seq=$(basename "$0") |
| 23 | echo "QA output created by $seq" |
| 24 | |
| 25 | status=1 # failure is the default! |
| 26 | |
| 27 | _cleanup() |
| 28 | { |
| 29 | _cleanup_test_img |
| 30 | } |
| 31 | trap "_cleanup; exit \$status" 0 1 2 3 15 |
| 32 | |
| 33 | # get standard environment, filters and checks |
| 34 | . ./common.rc |
| 35 | . ./common.filter |
| 36 | |
| 37 | # This is a qcow2 regression test |
| 38 | _supported_fmt qcow2 |
| 39 | _supported_proto file |
| 40 | _supported_os Linux |
| 41 | |
| 42 | # We use our own external data file and our own cluster size, and we |
| 43 | # require v3 images |
| 44 | _unsupported_imgopts data_file cluster_size 'compat=0.10' |
| 45 | |
| 46 | |
| 47 | # We need a backing file so that handle_alloc_space() will not do |
| 48 | # anything. (If it were to do anything, it would simply fail its |
| 49 | # write-zeroes request because the request range is too large.) |
| 50 | TEST_IMG="$TEST_IMG.base" _make_test_img 4G |
| 51 | $QEMU_IO -c 'write 0 512' "$TEST_IMG.base" | _filter_qemu_io |
| 52 | |
| 53 | # (Use .orig because _cleanup_test_img will remove that file) |
| 54 | # We need a large cluster size, see below for why (above the $QEMU_IO |
| 55 | # invocation) |
| 56 | _make_test_img -o cluster_size=2M,data_file="$TEST_IMG.orig" \ |
| 57 | -b "$TEST_IMG.base" -F $IMGFMT 4G |
| 58 | |
| 59 | # We want a null-co as the data file, because it allows us to quickly |
| 60 | # "write" 2G of data without using any space. |
| 61 | # (qemu-img create does not like it, though, because null-co does not |
| 62 | # support image creation.) |
| 63 | test_img_with_null_data="json:{ |
| 64 | 'driver': '$IMGFMT', |
| 65 | 'file': { |
| 66 | 'filename': '$TEST_IMG' |
| 67 | }, |
| 68 | 'data-file': { |
| 69 | 'driver': 'null-co', |
| 70 | 'size':'4294967296' |
| 71 | } |
| 72 | }" |
| 73 | |
| 74 | # This gives us a range of: |
| 75 | # 2^31 - 512 + 768 - 1 = 2^31 + 255 > 2^31 |
| 76 | # until the beginning of the end COW block. (The total allocation |
| 77 | # size depends on the cluster size, but all that is important is that |
| 78 | # it exceeds INT_MAX.) |
| 79 | # |
| 80 | # 2^31 - 512 is the maximum request size. We want this to result in a |
| 81 | # single allocation, and because the qcow2 driver splits allocations |
| 82 | # on L2 boundaries, we need large L2 tables; hence the cluster size of |
| 83 | # 2 MB. (Anything from 256 kB should work, though, because then one L2 |
| 84 | # table covers 8 GB.) |
| 85 | $QEMU_IO -c "write 768 $((2 ** 31 - 512))" "$test_img_with_null_data" | _filter_qemu_io |
| 86 | |
| 87 | _check_test_img |
| 88 | |
| 89 | # success, all done |
| 90 | echo "*** done" |
| 91 | rm -f $seq.full |
| 92 | status=0 |