tests/qemu-iotests/033

   1 #!/bin/bash
   2 #
   3 # Test aligned and misaligned write zeroes operations.
   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=pbonzini@redhat.com
  23
  24 seq=`basename $0`
  25 echo "QA output created by $seq"
  26
  27 here=`pwd`
  28 status=1        # failure is the default!
  29
  30 _cleanup()
  31 {
  32         _cleanup_test_img
  33 }
  34 trap "_cleanup; exit \$status" 0 1 2 3 15
  35
  36 # get standard environment, filters and checks
  37 . ./common.rc
  38 . ./common.filter
  39
  40 _supported_fmt generic
  41 _supported_proto generic
  42 _supported_os Linux
  43
  44
  45 size=128M
  46 _make_test_img $size
  47
  48 do_test()
  49 {
  50         local align=$1
  51         local iocmd=$2
  52         local img=$3
  53         if [ "$IMGOPTSSYNTAX" = "true" ]
  54         then
  55             IO_OPEN_ARG="$img"
  56             IO_EXTRA_ARGS="--image-opts"
  57         else
  58             IO_OPEN_ARG="-o driver=$IMGFMT,file.align=$align blkdebug::$img"
  59             IO_EXTRA_ARGS=""
  60         fi
  61         {
  62                 echo "open $IO_OPEN_ARG"
  63                 echo $iocmd
  64         } | $QEMU_IO $IO_EXTRA_ARGS
  65 }
  66
  67 echo
  68 echo "=== Test aligned and misaligned write zeroes operations ==="
  69
  70 for write_zero_cmd in "write -z" "aio_write -z"; do
  71 for align in 512 4k; do
  72         echo
  73         echo "== preparing image =="
  74         do_test $align "write -P 0xa 0x200 0x400" "$TEST_IMG" | _filter_qemu_io
  75         do_test $align "write -P 0xa 0x20000 0x600" "$TEST_IMG" | _filter_qemu_io
  76         do_test $align "$write_zero_cmd 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
  77
  78         echo
  79         echo "== verifying patterns (1) =="
  80         do_test $align "read -P 0xa 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
  81         do_test $align "read -P 0x0 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
  82         do_test $align "read -P 0xa 0x20400 0x200" "$TEST_IMG" | _filter_qemu_io
  83
  84         echo
  85         echo "== rewriting zeroes =="
  86         do_test $align "write -P 0xb 0x10000 0x10000" "$TEST_IMG" | _filter_qemu_io
  87         do_test $align "$write_zero_cmd 0x10000 0x10000" "$TEST_IMG" | _filter_qemu_io
  88
  89         echo
  90         echo "== verifying patterns (2) =="
  91         do_test $align "read -P 0x0 0x400 0x20000" "$TEST_IMG" | _filter_qemu_io
  92
  93         echo
  94         echo "== rewriting unaligned zeroes =="
  95         do_test $align "write -P 0xb 0x0 0x1000" "$TEST_IMG" | _filter_qemu_io
  96         do_test $align "$write_zero_cmd 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
  97
  98         echo
  99         echo "== verifying patterns (3) =="
 100         do_test $align "read -P 0xb 0x0 0x200" "$TEST_IMG" | _filter_qemu_io
 101         do_test $align "read -P 0x0 0x200 0x200" "$TEST_IMG" | _filter_qemu_io
 102         do_test $align "read -P 0xb 0x400 0xc00" "$TEST_IMG" | _filter_qemu_io
 103
 104         echo
 105 done
 106 done
 107
 108
 109 # Trigger truncate that would shrink qcow2 L1 table, which is done by
 110 #   clearing one entry (8 bytes) with bdrv_co_pwrite_zeroes()
 111
 112 echo
 113 echo "=== Test misaligned write zeroes via truncate ==="
 114 echo
 115
 116 # any size will do, but the smaller the size the smaller the required image
 117 CLUSTER_SIZE=$((4 * 1024))
 118 L2_COVERAGE=$(($CLUSTER_SIZE * $CLUSTER_SIZE / 8))
 119 _make_test_img $(($L2_COVERAGE * 2))
 120
 121 do_test 512 "write -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
 122 # next L2 table
 123 do_test 512 "write -P 1 $L2_COVERAGE 0x200" "$TEST_IMG" | _filter_qemu_io
 124
 125 # only interested in qcow2 here; also other formats might respond with
 126 #  "not supported" error message
 127 if [ $IMGFMT = "qcow2" ]; then
 128     do_test 512 "truncate $L2_COVERAGE" "$TEST_IMG" | _filter_qemu_io
 129 fi
 130
 131 do_test 512 "read -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
 132
 133 # success, all done
 134 echo
 135 echo "*** done"
 136 rm -f $seq.full
 137 status=0