tests/qemu-iotests/313

   1 #!/usr/bin/env bash
   2 # group: rw auto quick
   3 #
   4 # Test for the regression fixed in commit c8bf9a9169
   5 #
   6 # Copyright (C) 2020 Igalia, S.L.
   7 # Author: Alberto Garcia <berto@igalia.com>
   8 # Based on a test case by Maxim Levitsky <mlevitsk@redhat.com>
   9 #
  10 # This program is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 #
  23
  24 # creator
  25 owner=berto@igalia.com
  26
  27 seq=`basename $0`
  28 echo "QA output created by $seq"
  29
  30 status=1    # failure is the default!
  31
  32 _cleanup()
  33 {
  34     _cleanup_test_img
  35 }
  36 trap "_cleanup; exit \$status" 0 1 2 3 15
  37
  38 # get standard environment, filters and checks
  39 . ./common.rc
  40 . ./common.filter
  41
  42 _supported_fmt qcow2
  43 _supported_proto file
  44 _supported_os Linux
  45 _unsupported_imgopts cluster_size refcount_bits extended_l2 compat=0.10 data_file
  46
  47 # The cluster size must be at least the granularity of the mirror job (4KB)
  48 # Note that larger cluster sizes will produce very large images (several GBs)
  49 cluster_size=4096
  50 refcount_bits=64 # Make it equal to the L2 entry size for convenience
  51 options="cluster_size=${cluster_size},refcount_bits=${refcount_bits}"
  52
  53 # Number of refcount entries per refcount blocks
  54 ref_entries=$(( ${cluster_size} * 8 / ${refcount_bits} ))
  55
  56 # Number of data clusters needed to fill a refcount block
  57 # Equals ${ref_entries} minus two (one L2 table and one refcount block)
  58 data_clusters_per_refblock=$(( ${ref_entries} - 2 ))
  59
  60 # Number of entries in the refcount cache
  61 ref_blocks=4
  62
  63 # Write enough data clusters to fill the refcount cache and allocate
  64 # one more refcount block.
  65 # Subtract 3 clusters from the total: qcow2 header, refcount table, L1 table
  66 total_data_clusters=$(( ${data_clusters_per_refblock} * ${ref_blocks} + 1 - 3 ))
  67
  68 # Total size to write in bytes
  69 total_size=$(( ${total_data_clusters} * ${cluster_size} ))
  70
  71 echo
  72 echo '### Create the image'
  73 echo
  74 TEST_IMG_FILE=$TEST_IMG.base _make_test_img -o $options $total_size | _filter_img_create_size
  75
  76 echo
  77 echo '### Write data to allocate more refcount blocks than the cache can hold'
  78 echo
  79 $QEMU_IO -c "write -P 1 0 $total_size" $TEST_IMG.base | _filter_qemu_io
  80
  81 echo
  82 echo '### Create an overlay'
  83 echo
  84 _make_test_img -F $IMGFMT -b $TEST_IMG.base -o $options | _filter_img_create_size
  85
  86 echo
  87 echo '### Fill the overlay with zeroes'
  88 echo
  89 $QEMU_IO -c "write -z 0 $total_size" $TEST_IMG | _filter_qemu_io
  90
  91 echo
  92 echo '### Commit changes to the base image'
  93 echo
  94 $QEMU_IMG commit $TEST_IMG
  95
  96 echo
  97 echo '### Check the base image'
  98 echo
  99 $QEMU_IMG check $TEST_IMG.base
 100
 101 # success, all done
 102 echo "*** done"
 103 rm -f $seq.full
 104 status=0