tests/qemu-iotests/272

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