tests/qemu-iotests/033

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