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1 #!/usr/bin/env bash 2 # group: rw quick 3 # 4 # Test case for copy-on-read into qcow2 5 # 6 # Copyright (C) 2017 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 # creator 23 owner=eblake@redhat.com 24 25 seq="$(basename $0)" 26 echo "QA output created by $seq" 27 28 status=1 # failure is the default! 29 30 # get standard environment, filters and checks 31 . ./common.rc 32 . ./common.filter 33 34 TEST_WRAP="$TEST_DIR/t.wrap.qcow2" 35 BLKDBG_CONF="$TEST_DIR/blkdebug.conf" 36 37 # Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces 38 # or other problems 39 case "$TEST_DIR" in 40 *[^-_a-zA-Z0-9/]*) 41 _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;; 42 esac 43 44 _cleanup() 45 { 46 _cleanup_test_img 47 _rm_test_img "$TEST_WRAP" 48 rm -f "$BLKDBG_CONF" 49 } 50 trap "_cleanup; exit \$status" 0 1 2 3 15 51 52 # Test is supported for any backing file; but we force qcow2 for our wrapper. 53 _supported_fmt generic 54 _supported_proto generic 55 # LUKS support may be possible, but it complicates things. 56 _unsupported_fmt luks 57 _unsupported_imgopts "subformat=streamOptimized" 58 59 echo 60 echo '=== Copy-on-read ===' 61 echo 62 63 # Prep the images 64 # VPC rounds image sizes to a specific geometry, force a specific size. 65 if [ "$IMGFMT" = "vpc" ]; then 66 IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size") 67 fi 68 _make_test_img 4G 69 $QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io 70 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \ 71 _make_test_img --no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create 72 $QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io 73 74 # Ensure that a read of two clusters, but where one is already allocated, 75 # does not re-write the allocated cluster 76 cat > "$BLKDBG_CONF" <<EOF 77 [inject-error] 78 event = "cor_write" 79 sector = "2048" 80 EOF 81 $QEMU_IO -c "open -C \ 82 -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \ 83 -c "read -P 0 1M 128k" | _filter_qemu_io 84 85 # Read the areas we want copied. A zero-length read should still be a 86 # no-op. The next read is under 2G, but aligned so that rounding to 87 # clusters copies more than 2G of zeroes. The final read will pick up 88 # the non-zero data in the same cluster. Since a 2G read may exhaust 89 # memory on some machines (particularly 32-bit), we skip the test if 90 # that fails due to memory pressure. 91 $QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io 92 output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \ 93 "$TEST_WRAP" 2>&1 | _filter_qemu_io) 94 case $output in 95 *allocate*) 96 _notrun "Insufficent memory to run test" ;; 97 *) printf '%s\n' "$output" ;; 98 esac 99 $QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \ 100 "$TEST_WRAP" | _filter_qemu_io 101 102 # Copy-on-read is incompatible with read-only 103 $QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir 104 105 # Break the backing chain, and show that images are identical, and that 106 # we properly copied over explicit zeros. 107 $QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP" 108 $QEMU_IO -f qcow2 -c map "$TEST_WRAP" 109 _check_test_img 110 $QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP" 111 112 echo 113 echo '=== Partial final cluster ===' 114 echo 115 116 # Force compat=1.1, because writing zeroes on a v2 image without a 117 # backing file would just result in an unallocated cluster 118 # (Also, note that this is really a pure qcow2 test.) 119 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \ 120 _make_test_img --no-opts -o compat=1.1 1024 121 $QEMU_IO -f qcow2 -C -c 'read 0 1024' "$TEST_WRAP" | _filter_qemu_io 122 $QEMU_IO -f qcow2 -c map "$TEST_WRAP" 123 _check_test_img 124 125 # success, all done 126 echo '*** done' 127 status=0