tests/qemu-iotests/176

   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 # 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 $seq"
  31
  32 status=1        # failure is the default!
  33
  34 _cleanup()
  35 {
  36     _cleanup_test_img
  37     _rm_test_img "$TEST_IMG.itmd"
  38 }
  39 trap "_cleanup; exit \$status" 0 1 2 3 15
  40
  41 # get standard environment, filters and checks
  42 . ./common.rc
  43 . ./common.filter
  44 . ./common.pattern
  45
  46 # This test is specific to qcow2
  47 _supported_fmt qcow2
  48 _supported_proto file fuse
  49 _supported_os Linux
  50 # Persistent dirty bitmaps require compat=1.1;
  51 # Internal snapshots forbid using an external data file
  52 # (they work with refcount_bits=1 here, though, because there actually
  53 # is no data when creating the snapshot)
  54 _unsupported_imgopts 'compat=0.10' data_file
  55
  56 run_qemu()
  57 {
  58     $QEMU -nographic -qmp stdio -serial none "$@" 2>&1 \
  59         | _filter_testdir | _filter_qmp | _filter_qemu \
  60         | sed 's/"sha256": ".\{64\}"/"sha256": HASH/'
  61 }
  62
  63 for reason in snapshot bitmap; do
  64
  65 # Four passes:
  66 #  0: Two-layer backing chain, commit to upper backing file (implicitly)
  67 #     (in this case, the top image will be emptied)
  68 #  1: Two-layer backing chain, commit to upper backing file (explicitly)
  69 #     (in this case, the top image will implicitly stay unchanged)
  70 #  2: Two-layer backing chain, commit to upper backing file (implicitly with -d)
  71 #     (in this case, the top image will explicitly stay unchanged)
  72 #  3: Two-layer backing chain, commit to lower backing file
  73 #     (in this case, the top image will implicitly stay unchanged)
  74 #
  75 # 020 already tests committing, so this only tests whether image chains are
  76 # working properly and that all images above the base are emptied; therefore,
  77 # no complicated patterns are necessary.  Check near the 2G mark, as qcow2
  78 # has been buggy at that boundary in the past.
  79 for i in 0 1 2 3; do
  80
  81 echo
  82 echo "=== Test pass $reason.$i ==="
  83 echo
  84
  85 len=$((2100 * 1024 * 1024 + 512)) # larger than 2G, and not cluster aligned
  86 TEST_IMG="$TEST_IMG.base" _make_test_img $len
  87 TEST_IMG="$TEST_IMG.itmd" _make_test_img -b "$TEST_IMG.base" -F $IMGFMT $len
  88 _make_test_img -b "$TEST_IMG.itmd" -F $IMGFMT $len
  89 # Update the top image to use a feature that is incompatible with fast path
  90 case $reason in
  91     snapshot) $QEMU_IMG snapshot -c snap "$TEST_IMG" ;;
  92     bitmap)
  93         run_qemu <<EOF
  94 { "execute": "qmp_capabilities" }
  95 { "execute": "blockdev-add",
  96   "arguments": { "driver": "qcow2", "node-name": "drive0",
  97      "file": { "driver": "file", "filename": "$TEST_IMG" } } }
  98 { "execute": "block-dirty-bitmap-add",
  99   "arguments": { "node": "drive0", "name": "bitmap0",
 100      "persistent": true } }
 101 { "execute": "quit" }
 102 EOF
 103         ;;
 104 esac
 105
 106 $QEMU_IO -c "write -P 1 0x7ffd0000 192k" "$TEST_IMG.base" | _filter_qemu_io
 107 $QEMU_IO -c "write -P 2 0x7ffe0000 128k" "$TEST_IMG.itmd" | _filter_qemu_io
 108 $QEMU_IO -c "write -P 3 0x7fff0000 64k" "$TEST_IMG" | _filter_qemu_io
 109 $QEMU_IO -c "write -P 4 $(($len - 512)) 512" "$TEST_IMG" | _filter_qemu_io
 110
 111 if [ $i -lt 3 ]; then
 112     if [ $i == 0 ]; then
 113         # -b "$TEST_IMG.itmd" should be the default (that is, committing to the
 114         # first backing file in the chain)
 115         $QEMU_IMG commit "$TEST_IMG"
 116     elif [ $i == 1 ]; then
 117         # explicitly specify the commit target (this should imply -d)
 118         $QEMU_IMG commit -b "$TEST_IMG.itmd" "$TEST_IMG"
 119     else
 120         # do not explicitly specify the commit target, but use -d to leave the
 121         # top image unchanged
 122         $QEMU_IMG commit -d "$TEST_IMG"
 123     fi
 124
 125     # Bottom should be unchanged
 126     $QEMU_IO -c 'read -P 1 0x7ffd0000 192k' "$TEST_IMG.base" | _filter_qemu_io
 127     $QEMU_IO -c "read -P 0 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
 128
 129     # Intermediate should contain changes from top
 130     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 131     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 132     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.itmd" | _filter_qemu_io
 133     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.itmd" | _filter_qemu_io
 134
 135     # And in pass 0, the top image should be empty, whereas in both other passes
 136     # it should be unchanged (which is both checked by qemu-img map)
 137 else
 138     $QEMU_IMG commit -b "$TEST_IMG.base" "$TEST_IMG"
 139
 140     # Bottom should contain all changes
 141     $QEMU_IO -c 'read -P 1 0x7ffd0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 142     $QEMU_IO -c 'read -P 2 0x7ffe0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 143     $QEMU_IO -c 'read -P 3 0x7fff0000 64k' "$TEST_IMG.base" | _filter_qemu_io
 144     $QEMU_IO -c "read -P 4 $((len - 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
 145
 146     # Both top and intermediate should be unchanged
 147 fi
 148
 149 $QEMU_IMG map "$TEST_IMG.base" | _filter_qemu_img_map
 150 $QEMU_IMG map "$TEST_IMG.itmd" | _filter_qemu_img_map
 151 $QEMU_IMG map "$TEST_IMG" | _filter_qemu_img_map
 152
 153 # Check that the reason for slow path is still present, as appropriate
 154 case $reason in
 155     snapshot)
 156         $QEMU_IMG snapshot -l "$TEST_IMG" |
 157             sed 's/^\(.\{20\}\).*/\1/; s/ *$//' ;;
 158     bitmap)
 159         run_qemu <<EOF
 160 { "execute": "qmp_capabilities" }
 161 { "execute": "blockdev-add",
 162   "arguments": { "driver": "qcow2", "node-name": "drive0",
 163      "file": { "driver": "file", "filename": "$TEST_IMG" } } }
 164 { "execute": "x-debug-block-dirty-bitmap-sha256",
 165   "arguments": { "node": "drive0", "name": "bitmap0" } }
 166 { "execute": "quit" }
 167 EOF
 168         ;;
 169 esac
 170
 171 done
 172 done
 173
 174 # success, all done
 175 echo "*** done"
 176 rm -f $seq.full
 177 status=0