tests/qemu-iotests/176

   1 #!/bin/bash
   2 #
   3 # Commit changes into backing chains and empty the top image if the
   4 # backing image is not explicitly specified.
   5 #
   6 # Variant of 097, which includes snapshots and persistent bitmaps, to
   7 # tickle the slow codepath in qcow2. See also 198, for another feature
   8 # that tickles the slow codepath.
   9 #
  10 # Copyright (C) 2014, 2017 Red Hat, Inc.
  11 #
  12 # This program is free software; you can redistribute it and/or modify
  13 # it under the terms of the GNU General Public License as published by
  14 # the Free Software Foundation; either version 2 of the License, or
  15 # (at your option) any later version.
  16 #
  17 # This program is distributed in the hope that it will be useful,
  18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 # GNU General Public License for more details.
  21 #
  22 # You should have received a copy of the GNU General Public License
  23 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 #
  25
  26 # creator
  27 owner=mreitz@redhat.com
  28
  29 seq="$(basename $0)"
  30 echo "QA output created by $seq"
  31
  32 here="$PWD"
  33 status=1        # failure is the default!
  34
  35 _cleanup()
  36 {
  37     _cleanup_test_img
  38     _rm_test_img "$TEST_IMG.itmd"
  39 }
  40 trap "_cleanup; exit \$status" 0 1 2 3 15
  41
  42 # get standard environment, filters and checks
  43 . ./common.rc
  44 . ./common.filter
  45 . ./common.pattern
  46
  47 # This test is specific to qcow2
  48 _supported_fmt qcow2
  49 _supported_proto file
  50 _supported_os Linux
  51
  52 function run_qemu()
  53 {
  54     $QEMU -nographic -qmp stdio -serial none "$@" 2>&1 \
  55         | _filter_testdir | _filter_qmp | _filter_qemu \
  56         | sed 's/"sha256": ".\{64\}"/"sha256": HASH/'
  57 }
  58
  59 for reason in snapshot bitmap; do
  60
  61 # Four passes:
  62 #  0: Two-layer backing chain, commit to upper backing file (implicitly)
  63 #     (in this case, the top image will be emptied)
  64 #  1: Two-layer backing chain, commit to upper backing file (explicitly)
  65 #     (in this case, the top image will implicitly stay unchanged)
  66 #  2: Two-layer backing chain, commit to upper backing file (implicitly with -d)
  67 #     (in this case, the top image will explicitly stay unchanged)
  68 #  3: Two-layer backing chain, commit to lower backing file
  69 #     (in this case, the top image will implicitly stay unchanged)
  70 #
  71 # 020 already tests committing, so this only tests whether image chains are
  72 # working properly and that all images above the base are emptied; therefore,
  73 # no complicated patterns are necessary.  Check near the 2G mark, as qcow2
  74 # has been buggy at that boundary in the past.
  75 for i in 0 1 2 3; do
  76
  77 echo
  78 echo "=== Test pass $reason.$i ==="
  79 echo
  80
  81 len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
  82 TEST_IMG="$TEST_IMG.base" _make_test_img $len
  83 TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" $len
  84 _make_test_img -b "$TEST_IMG.itmd" $len
  85 # Update the top image to use a feature that is incompatible with fast path
  86 case $reason in
  87     snapshot) $QEMU_IMG snapshot -c snap "$TEST_IMG" ;;
  88     bitmap)
  89         run_qemu <<EOF
  90 { "execute": "qmp_capabilities" }
  91 { "execute": "blockdev-add",
  92   "arguments": { "driver": "qcow2", "node-name": "drive0",
  93      "file": { "driver": "file", "filename": "$TEST_IMG" } } }
  94 { "execute": "block-dirty-bitmap-add",
  95   "arguments": { "node": "drive0", "name": "bitmap0",
  96      "persistent": true, "autoload": true } }
  97 { "execute": "quit" }
  98 EOF
  99         ;;
 100 esac
 101
 102 $QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
 103 $QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
 104 $QEMU_IO -c "write -P 3 0x7fff0000 64k" "$TEST_IMG" | _filter_qemu_io
 105 $QEMU_IO -c "write -P 4 $(($len - 512)) 512" "$TEST_IMG" | _filter_qemu_io
 106
 107 if [ $i -lt 3 ]; then
 108     if [ $i == 0 ]; then
 109         # -b "$TEST_IMG.itmd" should be the default (that is, committing to the
 110         # first backing file in the chain)
 111         $QEMU_IMG commit "$TEST_IMG"
 112     elif [ $i == 1 ]; then
 113         # explicitly specify the commit target (this should imply -d)
 114         $QEMU_IMG commit -b "$TEST_IMG.itmd" "$TEST_IMG"
 115     else
 116         # do not explicitly specify the commit target, but use -d to leave the
 117         # top image unchanged
 118         $QEMU_IMG commit -d "$TEST_IMG"
 119     fi
 120
 121     # Bottom should be unchanged
 122     $QEMU_IO -c 'read -P 1 0x7ffd0000 192k' "$TEST_IMG.base" | _filter_qemu_io
 123     $QEMU_IO -c "read -P 0 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
 124
 125     # Intermediate should contain changes from top
 126     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 127     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 128     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 129     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.itmd" | _filter_qemu_io
 130
 131     # And in pass 0, the top image should be empty, whereas in both other passes
 132     # it should be unchanged (which is both checked by qemu-img map)
 133 else
 134     $QEMU_IMG commit -b "$TEST_IMG.base" "$TEST_IMG"
 135
 136     # Bottom should contain all changes
 137     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 138     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 139     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 140     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
 141
 142     # Both top and intermediate should be unchanged
 143 fi
 144
 145 $QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
 146 $QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
 147 $QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
 148
 149 # Check that the reason for slow path is still present, as appropriate
 150 case $reason in
 151     snapshot)
 152         $QEMU_IMG snapshot -l "$TEST_IMG" |
 153             sed 's/^\(.\{20\}\).*/\1/; s/ *$//' ;;
 154     bitmap)
 155         run_qemu <<EOF
 156 { "execute": "qmp_capabilities" }
 157 { "execute": "blockdev-add",
 158   "arguments": { "driver": "qcow2", "node-name": "drive0",
 159      "file": { "driver": "file", "filename": "$TEST_IMG" } } }
 160 { "execute": "x-debug-block-dirty-bitmap-sha256",
 161   "arguments": { "node": "drive0", "name": "bitmap0" } }
 162 { "execute": "quit" }
 163 EOF
 164         ;;
 165 esac
 166
 167 done
 168 done
 169
 170 # success, all done
 171 echo "*** done"
 172 rm -f $seq.full
 173 status=0