tests/qemu-iotests/028

   1 #!/usr/bin/env bash
   2 # group: rw backing quick
   3 #
   4 # Test that backing files can be smaller than the image
   5 #
   6 # Copyright (C) 2010 IBM, Corp.
   7 #
   8 # Based on 017:
   9 # Copyright (C) 2009 Red Hat, Inc.
  10 #
  11 # This program is free software; you can redistribute it and/or modify
  12 # it under the terms of the GNU General Public License as published by
  13 # the Free Software Foundation; either version 2 of the License, or
  14 # (at your option) any later version.
  15 #
  16 # This program is distributed in the hope that it will be useful,
  17 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 # GNU General Public License for more details.
  20 #
  21 # You should have received a copy of the GNU General Public License
  22 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 #
  24
  25 # creator
  26 owner=stefanha@linux.vnet.ibm.com
  27
  28 seq=`basename $0`
  29 echo "QA output created by $seq"
  30
  31 status=1        # failure is the default!
  32
  33 _cleanup()
  34 {
  35     _cleanup_qemu
  36     _rm_test_img "${TEST_IMG}.copy"
  37     _cleanup_test_img
  38 }
  39 trap "_cleanup; exit \$status" 0 1 2 3 15
  40
  41 # get standard environment, filters and checks
  42 . ./common.rc
  43 . ./common.filter
  44 . ./common.pattern
  45 . ./common.qemu
  46
  47 # Any format supporting backing files except vmdk and qcow which do not support
  48 # smaller backing files.
  49 _supported_fmt qcow2 qed
  50 _supported_proto file fuse
  51 _supported_os Linux
  52
  53 # Choose a size that is not necessarily a cluster size multiple for image
  54 # formats that use clusters.  This will ensure that the base image doesn't end
  55 # precisely on a cluster boundary (the easy case).
  56 image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 ))
  57
  58 # The base image is smaller than the image file
  59 base_size=$(( image_size - 1024 * 1024 * 1024 ))
  60
  61 offset=$(( base_size - 32 * 1024 ))
  62
  63 TEST_IMG_SAVE="$TEST_IMG"
  64 TEST_IMG="$TEST_IMG.base"
  65
  66 _make_test_img $base_size
  67
  68 echo "Filling base image"
  69 echo
  70
  71 # Fill end of base image with a pattern, skipping every other sector
  72 io writev $offset 512 1024 32
  73
  74 _check_test_img
  75
  76 echo "Creating test image with backing file"
  77 echo
  78
  79 TEST_IMG="$TEST_IMG_SAVE"
  80 _make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size
  81
  82 echo "Filling test image"
  83 echo
  84
  85 # Write every other sector around where the base image ends
  86 io writev $(( offset + 512 )) 512 1024 64
  87
  88 _check_test_img
  89
  90 echo "Reading"
  91 echo
  92
  93 # Base image sectors
  94 io readv $(( offset )) 512 1024 32
  95
  96 # Image sectors
  97 io readv $(( offset + 512 )) 512 1024 64
  98
  99 # Zero sectors beyond end of base image
 100 io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
 101
 102 _check_test_img
 103
 104 # Rebase it on top of its base image
 105 $QEMU_IMG rebase -b "$TEST_IMG.base" -F $IMGFMT "$TEST_IMG"
 106
 107 echo
 108 echo block-backup
 109 echo
 110
 111 qemu_comm_method="monitor"
 112 _launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},aio=${AIOMODE},id=disk
 113 h=$QEMU_HANDLE
 114 if [ "${VALGRIND_QEMU}" == "y" ]; then
 115     QEMU_COMM_TIMEOUT=7
 116 else
 117     QEMU_COMM_TIMEOUT=1
 118 fi
 119
 120 TEST_IMG="$TEST_IMG.copy" _make_test_img $image_size
 121 _send_qemu_cmd $h "drive_backup -n disk ${TEST_IMG}.copy" "(qemu)" \
 122     | _filter_imgfmt
 123
 124 silent=y qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs"
 125 _send_qemu_cmd $h "info block-jobs" "No active jobs"
 126 _send_qemu_cmd $h 'quit' ""
 127
 128 # Base image sectors
 129 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32
 130
 131 # Image sectors
 132 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64
 133
 134 # Zero sectors beyond end of base image
 135 TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
 136
 137
 138 _check_test_img
 139
 140 echo
 141 echo '=== Reading across backing EOF in one operation ==='
 142 echo
 143
 144 # Use a cluster boundary as the base end here
 145 base_size=$((3 * 1024 * 1024 * 1024))
 146
 147 TEST_IMG="$TEST_IMG.base" _make_test_img $base_size
 148 _make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size
 149
 150 # Write 16 times 42 at the end of the base image
 151 $QEMU_IO -c "write -P 42 $((base_size - 16)) 16" "$TEST_IMG.base" \
 152     | _filter_qemu_io
 153
 154 # Read 32 bytes across the base EOF from the top;
 155 # should be 16 times 0x2a, then 16 times 0x00
 156 $QEMU_IO -c "read -v $((base_size - 16)) 32" "$TEST_IMG" \
 157     | _filter_qemu_io
 158
 159 # success, all done
 160 echo "*** done"
 161 rm -f $seq.full
 162 status=0