tests/qemu-iotests/038

   1 #!/bin/bash
   2 #
   3 # Test COW from backing files with AIO
   4 #
   5 # Copyright (C) 2012 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 # creator
  22 owner=kwolf@redhat.com
  23
  24 seq=`basename $0`
  25 echo "QA output created by $seq"
  26
  27 here=`pwd`
  28 tmp=/tmp/$$
  29 status=1        # failure is the default!
  30
  31 _cleanup()
  32 {
  33         _cleanup_test_img
  34 }
  35 trap "_cleanup; exit \$status" 0 1 2 3 15
  36
  37 # get standard environment, filters and checks
  38 . ./common.rc
  39 . ./common.filter
  40
  41 _supported_fmt qcow2 qed
  42 _supported_proto generic
  43 _supported_os Linux
  44
  45 CLUSTER_SIZE=2M
  46 size=128M
  47
  48 echo
  49 echo "== creating backing file for COW tests =="
  50
  51 _make_test_img $size
  52
  53 function backing_io()
  54 {
  55     local offset=$1
  56     local sectors=$2
  57     local op=$3
  58     local pattern=0
  59     local cur_sec=0
  60
  61     for i in $(seq 0 $((sectors - 1))); do
  62         cur_sec=$((offset / 65536 + i))
  63         pattern=$(( ( (cur_sec % 128) + (cur_sec / 128)) % 128 ))
  64
  65         echo "$op -P $pattern $((cur_sec * 64))k 64k"
  66     done
  67 }
  68
  69 backing_io 0 256 write | $QEMU_IO $TEST_IMG | _filter_qemu_io
  70
  71 mv $TEST_IMG $TEST_IMG.base
  72
  73 _make_test_img -b $TEST_IMG.base 6G
  74
  75 echo
  76 echo "== Some concurrent requests touching the same cluster =="
  77
  78 function overlay_io()
  79 {
  80     # Start with a request touching two clusters
  81     echo aio_write -P 0x80 2020k 80k
  82
  83     # Then add some requests all over the place
  84     for i in $(seq 0 15; seq 17 31; seq 33 47); do
  85         echo aio_write -P $((0x81 + i)) $((i * 128))k 64k
  86     done
  87
  88     # Then backwards overwriting part of them
  89     for i in $( (seq 0 15; seq 17 31; seq 33 47) | tac); do
  90         echo aio_write -P $((0x81 + i)) $((i * 128 + 32))k 64k
  91     done
  92
  93     # And finally crossing the next cluster boundary
  94     echo aio_write -P 0x90 4080k 80k
  95 }
  96
  97 overlay_io | $QEMU_IO $TEST_IMG | _filter_qemu_io |\
  98         sed -e 's/bytes at offset [0-9]*/bytes at offset XXX/g'
  99
 100 echo
 101 echo "== Verify image content =="
 102
 103 function verify_io()
 104 {
 105     echo read -P 31 2016k 4k
 106     echo read -P 0x80 2020k 80k
 107     echo read -P 32 2100k 12k
 108     echo read -P 33 2112k 64k
 109
 110     echo read -P 63 4064k 16k
 111     echo read -P 0x90 4080k 80k
 112     echo read -P 65 4160k 64k
 113
 114     for i in $(seq 0 15; seq 17 31; seq 33 47); do
 115         echo read -P $((0x81 + i)) $((i * 128))k 96k
 116     done
 117
 118     for i in $(seq 0 14; seq 16 30; seq 32 47); do
 119         local cur_sec=$(( i * 2 + 1 ))
 120         local pattern=$(( ( (cur_sec % 128) + (cur_sec / 128)) % 128 ))
 121
 122         echo read -P $pattern $((i * 128 + 96))k 32k
 123     done
 124 }
 125
 126 verify_io | $QEMU_IO $TEST_IMG | _filter_qemu_io
 127
 128 _check_test_img
 129
 130 # success, all done
 131 echo "*** done"
 132 rm -f $seq.full
 133 status=0