tests/qemu-iotests/176

   1 #!/usr/bin/env bash
   2 # group: rw auto backing
   3 #
   4 # Commit changes into backing chains and empty the top image if the
   5 # backing image is not explicitly specified.
   6 #
   7 # Variant of 097, which includes snapshots and persistent bitmaps, to
   8 # tickle the slow codepath in qcow2. See also 198, for another feature
   9 # that tickles the slow codepath.
  10 #
  11 # Copyright (C) 2014, 2017 Red Hat, Inc.
  12 #
  13 # This program is free software; you can redistribute it and/or modify
  14 # it under the terms of the GNU General Public License as published by
  15 # the Free Software Foundation; either version 2 of the License, or
  16 # (at your option) any later version.
  17 #
  18 # This program is distributed in the hope that it will be useful,
  19 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 # GNU General Public License for more details.
  22 #
  23 # You should have received a copy of the GNU General Public License
  24 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25 #
  26
  27 # creator
  28 owner=hreitz@redhat.com
  29
  30 seq="$(basename $0)"
  31 echo "QA output created by $seq"
  32
  33 status=1        # failure is the default!
  34
  35 _cleanup()
  36 {
  37     _cleanup_test_img
  38     _rm_test_img "$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 fuse
  50 _supported_os Linux
  51 # Persistent dirty bitmaps require compat=1.1;
  52 # Internal snapshots forbid using an external data file
  53 # (they work with refcount_bits=1 here, though, because there actually
  54 # is no data when creating the snapshot)
  55 _unsupported_imgopts 'compat=0.10' data_file
  56
  57 run_qemu()
  58 {
  59     $QEMU -nographic -qmp stdio -serial none "$@" 2>&1 \
  60         | _filter_testdir | _filter_qmp | _filter_qemu \
  61         | sed 's/"sha256": ".\{64\}"/"sha256": HASH/'
  62 }
  63
  64 for reason in snapshot bitmap; do
  65
  66 # Four passes:
  67 #  0: Two-layer backing chain, commit to upper backing file (implicitly)
  68 #     (in this case, the top image will be emptied)
  69 #  1: Two-layer backing chain, commit to upper backing file (explicitly)
  70 #     (in this case, the top image will implicitly stay unchanged)
  71 #  2: Two-layer backing chain, commit to upper backing file (implicitly with -d)
  72 #     (in this case, the top image will explicitly stay unchanged)
  73 #  3: Two-layer backing chain, commit to lower backing file
  74 #     (in this case, the top image will implicitly stay unchanged)
  75 #
  76 # 020 already tests committing, so this only tests whether image chains are
  77 # working properly and that all images above the base are emptied; therefore,
  78 # no complicated patterns are necessary.  Check near the 2G mark, as qcow2
  79 # has been buggy at that boundary in the past.
  80 for i in 0 1 2 3; do
  81
  82 echo
  83 echo "=== Test pass $reason.$i ==="
  84 echo
  85
  86 len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
  87 TEST_IMG="$TEST_IMG.base" _make_test_img $len
  88 TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT $len
  89 _make_test_img -b "$TEST_IMG.itmd" -F $IMGFMT $len
  90 # Update the top image to use a feature that is incompatible with fast path
  91 case $reason in
  92     snapshot) $QEMU_IMG snapshot -c snap "$TEST_IMG" ;;
  93     bitmap)
  94         run_qemu <<EOF
  95 { "execute": "qmp_capabilities" }
  96 { "execute": "blockdev-add",
  97   "arguments": { "driver": "qcow2", "node-name": "drive0",
  98      "file": { "driver": "file", "filename": "$TEST_IMG" } } }
  99 { "execute": "block-dirty-bitmap-add",
 100   "arguments": { "node": "drive0", "name": "bitmap0",
 101      "persistent": true } }
 102 { "execute": "quit" }
 103 EOF
 104         ;;
 105 esac
 106
 107 $QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
 108 $QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
 109 $QEMU_IO -c "write -P 3 0x7fff0000 64k" "$TEST_IMG" | _filter_qemu_io
 110 $QEMU_IO -c "write -P 4 $(($len - 512)) 512" "$TEST_IMG" | _filter_qemu_io
 111
 112 if [ $i -lt 3 ]; then
 113     if [ $i == 0 ]; then
 114         # -b "$TEST_IMG.itmd" should be the default (that is, committing to the
 115         # first backing file in the chain)
 116         $QEMU_IMG commit "$TEST_IMG"
 117     elif [ $i == 1 ]; then
 118         # explicitly specify the commit target (this should imply -d)
 119         $QEMU_IMG commit -b "$TEST_IMG.itmd" "$TEST_IMG"
 120     else
 121         # do not explicitly specify the commit target, but use -d to leave the
 122         # top image unchanged
 123         $QEMU_IMG commit -d "$TEST_IMG"
 124     fi
 125
 126     # Bottom should be unchanged
 127     $QEMU_IO -c 'read -P 1 0x7ffd0000 192k' "$TEST_IMG.base" | _filter_qemu_io
 128     $QEMU_IO -c "read -P 0 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
 129
 130     # Intermediate should contain changes from top
 131     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 132     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 133     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 134     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.itmd" | _filter_qemu_io
 135
 136     # And in pass 0, the top image should be empty, whereas in both other passes
 137     # it should be unchanged (which is both checked by qemu-img map)
 138 else
 139     $QEMU_IMG commit -b "$TEST_IMG.base" "$TEST_IMG"
 140
 141     # Bottom should contain all changes
 142     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 143     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 144     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 145     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
 146
 147     # Both top and intermediate should be unchanged
 148 fi
 149
 150 $QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
 151 $QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
 152 $QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
 153
 154 # Check that the reason for slow path is still present, as appropriate
 155 case $reason in
 156     snapshot)
 157         $QEMU_IMG snapshot -l "$TEST_IMG" |
 158             sed 's/^\(.\{20\}\).*/\1/; s/ *$//' ;;
 159     bitmap)
 160         run_qemu <<EOF
 161 { "execute": "qmp_capabilities" }
 162 { "execute": "blockdev-add",
 163   "arguments": { "driver": "qcow2", "node-name": "drive0",
 164      "file": { "driver": "file", "filename": "$TEST_IMG" } } }
 165 { "execute": "x-debug-block-dirty-bitmap-sha256",
 166   "arguments": { "node": "drive0", "name": "bitmap0" } }
 167 { "execute": "quit" }
 168 EOF
 169         ;;
 170 esac
 171
 172 done
 173 done
 174
 175 # success, all done
 176 echo "*** done"
 177 rm -f $seq.full
 178 status=0