tests/qemu-iotests/097

   1 #!/usr/bin/env bash
   2 #
   3 # Commit changes into backing chains and empty the top image if the
   4 # backing image is not explicitly specified
   5 #
   6 # Copyright (C) 2014 Red Hat, Inc.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 # creator
  23 owner=mreitz@redhat.com
  24
  25 seq="$(basename $0)"
  26 echo "QA output created by $seq"
  27
  28 status=1        # failure is the default!
  29
  30 _cleanup()
  31 {
  32     _cleanup_test_img
  33     _rm_test_img "$TEST_IMG.itmd"
  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 . ./common.pattern
  41
  42 # Any format supporting backing files and bdrv_make_empty
  43 _supported_fmt qcow qcow2
  44 _supported_proto file
  45 _supported_os Linux
  46
  47
  48 # Four main passes:
  49 #  0: Two-layer backing chain, commit to upper backing file (implicitly)
  50 #     (in this case, the top image will be emptied)
  51 #  1: Two-layer backing chain, commit to upper backing file (explicitly)
  52 #     (in this case, the top image will implicitly stay unchanged)
  53 #  2: Two-layer backing chain, commit to upper backing file (implicitly with -d)
  54 #     (in this case, the top image will explicitly stay unchanged)
  55 #  3: Two-layer backing chain, commit to lower backing file
  56 #     (in this case, the top image will implicitly stay unchanged)
  57 #
  58 # 020 already tests committing, so this only tests whether image chains are
  59 # working properly and that all images above the base are emptied; therefore,
  60 # no complicated patterns are necessary.  Check near the 2G mark, as qcow2
  61 # has been buggy at that boundary in the past.
  62 for i in 0 1 2 3; do
  63
  64 echo
  65 echo "=== Test pass $i ==="
  66 echo
  67
  68 len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
  69 TEST_IMG="$TEST_IMG.base" _make_test_img $len
  70 TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" $len
  71 _make_test_img -b "$TEST_IMG.itmd" $len
  72
  73 $QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
  74 $QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
  75 $QEMU_IO -c "write -P 3 0x7fff0000 64k" "$TEST_IMG" | _filter_qemu_io
  76 $QEMU_IO -c "write -P 4 $(($len - 512)) 512" "$TEST_IMG" | _filter_qemu_io
  77
  78 if [ $i -lt 3 ]; then
  79     if [ $i == 0 ]; then
  80         # -b "$TEST_IMG.itmd" should be the default (that is, committing to the
  81         # first backing file in the chain)
  82         $QEMU_IMG commit "$TEST_IMG"
  83     elif [ $i == 1 ]; then
  84         # explicitly specify the commit target (this should imply -d)
  85         $QEMU_IMG commit -b "$TEST_IMG.itmd" "$TEST_IMG"
  86     else
  87         # do not explicitly specify the commit target, but use -d to leave the
  88         # top image unchanged
  89         $QEMU_IMG commit -d "$TEST_IMG"
  90     fi
  91
  92     # Bottom should be unchanged
  93     $QEMU_IO -c 'read -P 1 0x7ffd0000 192k' "$TEST_IMG.base" | _filter_qemu_io
  94     $QEMU_IO -c "read -P 0 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
  95
  96     # Intermediate should contain changes from top
  97     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
  98     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
  99     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 100     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.itmd" | _filter_qemu_io
 101
 102     # And in pass 0, the top image should be empty, whereas in both other passes
 103     # it should be unchanged (which is both checked by qemu-img map)
 104 else
 105     $QEMU_IMG commit -b "$TEST_IMG.base" "$TEST_IMG"
 106
 107     # Bottom should contain all changes
 108     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 109     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 110     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 111     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
 112
 113     # Both top and intermediate should be unchanged
 114 fi
 115
 116 $QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
 117 $QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
 118 $QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
 119
 120 done
 121
 122
 123 # success, all done
 124 echo "*** done"
 125 rm -f $seq.full
 126 status=0