tests/qemu-iotests/272

   1 #!/usr/bin/env bash
   2 #
   3 # Test compressed write to a qcow2 image at an offset above 4 GB
   4 #
   5 # Copyright (C) 2019 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 seq=$(basename "$0")
  22 echo "QA output created by $seq"
  23
  24 status=1        # failure is the default!
  25
  26 _cleanup()
  27 {
  28     _cleanup_test_img
  29 }
  30 trap "_cleanup; exit \$status" 0 1 2 3 15
  31
  32 # get standard environment, filters and checks
  33 . ./common.rc
  34 . ./common.filter
  35
  36 # This is a qcow2 regression test
  37 _supported_fmt qcow2
  38 _supported_proto file
  39
  40 # External data files do not support compression;
  41 # We need an exact cluster size (2M) and refcount width (2) so we can
  42 # get this test quickly over with; and this in turn require
  43 # compat=1.1
  44 _unsupported_imgopts data_file cluster_size refcount_bits 'compat=0.10'
  45
  46 # The idea is: Create an empty file, mark the first 4 GB as used, then
  47 # do a compressed write that thus must be put beyond 4 GB.
  48 # (This used to fail because the compressed sector mask was just a
  49 # 32 bit mask, so qemu-img check will count a cluster before 4 GB as
  50 # referenced twice.)
  51
  52 # We would like to use refcount_bits=1 here, but then qemu-img check
  53 # will throw an error when trying to count a cluster as referenced
  54 # twice.
  55 _make_test_img -o cluster_size=2M,refcount_bits=2 64M
  56
  57 reft_offs=$(peek_file_be "$TEST_IMG" 48 8)
  58 refb_offs=$(peek_file_be "$TEST_IMG" $reft_offs 8)
  59
  60 # We want to cover 4 GB, those are 2048 clusters, equivalent to
  61 # 4096 bit = 512 B.
  62 truncate -s 4G "$TEST_IMG"
  63 for ((in_refb_offs = 0; in_refb_offs < 512; in_refb_offs += 8)); do
  64     poke_file "$TEST_IMG" $((refb_offs + in_refb_offs)) \
  65         '\x55\x55\x55\x55\x55\x55\x55\x55'
  66 done
  67
  68 $QEMU_IO -c 'write -c -P 42 0 2M' "$TEST_IMG" | _filter_qemu_io
  69
  70 echo
  71 echo '--- Check ---'
  72
  73 # This should only print the leaked clusters in the first 4 GB
  74 _check_test_img | grep -v '^Leaked cluster '
  75
  76 # success, all done
  77 echo "*** done"
  78 rm -f $seq.full
  79 status=0