1 #!/usr/bin/env bash 2 # 3 # Test that backing files can be smaller than the image 4 # 5 # Copyright (C) 2010 IBM, Corp. 6 # 7 # Based on 017: 8 # Copyright (C) 2009 Red Hat, Inc. 9 # 10 # This program is free software; you can redistribute it and/or modify 11 # it under the terms of the GNU General Public License as published by 12 # the Free Software Foundation; either version 2 of the License, or 13 # (at your option) any later version. 14 # 15 # This program is distributed in the hope that it will be useful, 16 # but WITHOUT ANY WARRANTY; without even the implied warranty of 17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 # GNU General Public License for more details. 19 # 20 # You should have received a copy of the GNU General Public License 21 # along with this program. If not, see <http://www.gnu.org/licenses/>. 22 # 23 24 # creator 25 owner=stefanha@linux.vnet.ibm.com 26 27 seq=`basename $0` 28 echo "QA output created by $seq" 29 30 status=1 # failure is the default! 31 32 _cleanup() 33 { 34 _cleanup_qemu 35 _rm_test_img "${TEST_IMG}.copy" 36 _cleanup_test_img 37 } 38 trap "_cleanup; exit \$status" 0 1 2 3 15 39 40 # get standard environment, filters and checks 41 . ./common.rc 42 . ./common.filter 43 . ./common.pattern 44 . ./common.qemu 45 46 # Any format supporting backing files except vmdk and qcow which do not support 47 # smaller backing files. 48 _supported_fmt qcow2 qed 49 _supported_proto file 50 _supported_os Linux 51 52 # Choose a size that is not necessarily a cluster size multiple for image 53 # formats that use clusters. This will ensure that the base image doesn't end 54 # precisely on a cluster boundary (the easy case). 55 image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 )) 56 57 # The base image is smaller than the image file 58 base_size=$(( image_size - 1024 * 1024 * 1024 )) 59 60 offset=$(( base_size - 32 * 1024 )) 61 62 TEST_IMG_SAVE="$TEST_IMG" 63 TEST_IMG="$TEST_IMG.base" 64 65 _make_test_img $base_size 66 67 echo "Filling base image" 68 echo 69 70 # Fill end of base image with a pattern, skipping every other sector 71 io writev $offset 512 1024 32 72 73 _check_test_img 74 75 echo "Creating test image with backing file" 76 echo 77 78 TEST_IMG="$TEST_IMG_SAVE" 79 _make_test_img -b "$TEST_IMG.base" $image_size 80 81 echo "Filling test image" 82 echo 83 84 # Write every other sector around where the base image ends 85 io writev $(( offset + 512 )) 512 1024 64 86 87 _check_test_img 88 89 echo "Reading" 90 echo 91 92 # Base image sectors 93 io readv $(( offset )) 512 1024 32 94 95 # Image sectors 96 io readv $(( offset + 512 )) 512 1024 64 97 98 # Zero sectors beyond end of base image 99 io_zero readv $(( offset + 32 * 1024 )) 512 1024 32 100 101 _check_test_img 102 103 # Rebase it on top of its base image 104 $QEMU_IMG rebase -b "$TEST_IMG.base" "$TEST_IMG" 105 106 echo 107 echo block-backup 108 echo 109 110 qemu_comm_method="monitor" 111 _launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},aio=${AIOMODE},id=disk 112 h=$QEMU_HANDLE 113 if [ "${VALGRIND_QEMU}" == "y" ]; then 114 QEMU_COMM_TIMEOUT=7 115 else 116 QEMU_COMM_TIMEOUT=1 117 fi 118 119 # Silence output since it contains the disk image path and QEMU's readline 120 # character echoing makes it very hard to filter the output. Plus, there 121 # is no telling how many times the command will repeat before succeeding. 122 # (Note that creating the image results in a "Formatting..." message over 123 # stdout, which is the same channel the monitor uses. We cannot reliably 124 # wait for it because the monitor output may interact with it in such a 125 # way that _timed_wait_for cannot read it. However, once the block job is 126 # done, we know that the "Formatting..." message must have appeared 127 # already, so the output is still deterministic.) 128 silent=y _send_qemu_cmd $h "drive_backup disk ${TEST_IMG}.copy" "(qemu)" 129 silent=y qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs" 130 _send_qemu_cmd $h "info block-jobs" "No active jobs" 131 _send_qemu_cmd $h 'quit' "" 132 133 # Base image sectors 134 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32 135 136 # Image sectors 137 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64 138 139 # Zero sectors beyond end of base image 140 TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32 141 142 143 _check_test_img 144 145 # success, all done 146 echo "*** done" 147 rm -f $seq.full 148 status=0 149