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