tests/qemu-iotests/125

   1 #!/usr/bin/env bash
   2 #
   3 # Test preallocated growth of qcow2 images
   4 #
   5 # Copyright (C) 2017 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 # creator
  22 owner=mreitz@redhat.com
  23
  24 seq=$(basename $0)
  25 echo "QA output created by $seq"
  26
  27 status=1        # failure is the default!
  28
  29 _cleanup()
  30 {
  31         _cleanup_test_img
  32 }
  33 trap "_cleanup; exit \$status" 0 1 2 3 15
  34
  35 get_image_size_on_host()
  36 {
  37     $QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep "disk size" \
  38         | sed -e 's/^[^0-9]*\([0-9]\+\).*$/\1/'
  39 }
  40
  41 # get standard environment and filters
  42 . ./common.rc
  43 . ./common.filter
  44
  45 _supported_fmt qcow2
  46 _supported_proto file
  47 _supported_os Linux
  48
  49 if [ -z "$TEST_IMG_FILE" ]; then
  50     TEST_IMG_FILE=$TEST_IMG
  51 fi
  52
  53 # Generally, we create some image with or without existing preallocation and
  54 # then resize it. Then we write some data into the image and verify that its
  55 # size does not change if we have used preallocation.
  56
  57 # With a cluster size of 512 B, one L2 table covers 64 * 512 B = 32 kB.
  58 # One cluster of the L1 table covers 64 * 32 kB = 2 MB.
  59 # There are multiple cases we want to test:
  60 # (1) Grow an image without having to allocate a new L2 table.
  61 # (2) Grow an image, having to allocate a new L2 table.
  62 # (3) Grow an image, having to grow the L1 table.
  63 # Therefore, we create an image that is 48 kB below 2 MB. Then:
  64 # (1) We resize it to 2 MB - 32 kB. (+ 16 kB)
  65 # (2) We resize it to 2 MB.         (+ 48 kB)
  66 # (3) We resize it to 2 MB + 32 kB. (+ 80 kB)
  67
  68 # in B
  69 CREATION_SIZE=$((2 * 1024 * 1024 - 48 * 1024))
  70
  71 # 512 is the actual test -- but it's good to test 64k as well, just to be sure.
  72 for cluster_size in 512 64k; do
  73 # in kB
  74 for GROWTH_SIZE in 16 48 80; do
  75     for create_mode in off metadata falloc full; do
  76         for growth_mode in off metadata falloc full; do
  77             echo "--- cluster_size=$cluster_size growth_size=$GROWTH_SIZE create_mode=$create_mode growth_mode=$growth_mode ---"
  78
  79             IMGOPTS="preallocation=$create_mode,cluster_size=$cluster_size" _make_test_img ${CREATION_SIZE}
  80             $QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K
  81
  82             host_size_0=$(get_image_size_on_host)
  83             file_length_0=$(stat -c '%s' "$TEST_IMG_FILE")
  84
  85             $QEMU_IO -c "write 0 $CREATION_SIZE" "$TEST_IMG" | _filter_qemu_io
  86
  87             host_size_1=$(get_image_size_on_host)
  88             file_length_1=$(stat -c '%s' "$TEST_IMG_FILE")
  89
  90             $QEMU_IO -c "write $CREATION_SIZE ${GROWTH_SIZE}K" "$TEST_IMG" | _filter_qemu_io
  91
  92             host_size_2=$(get_image_size_on_host)
  93             file_length_2=$(stat -c '%s' "$TEST_IMG_FILE")
  94
  95             # Test creation preallocation: Compare #0 against #1
  96             if [ $create_mode != off ]; then
  97                 # The image length should not have grown
  98                 if [ $file_length_1 -gt $file_length_0 ]; then
  99                     echo "ERROR (create): Image length has grown from $file_length_0 to $file_length_1"
 100                 fi
 101                 if [ $create_mode != metadata ]; then
 102                     # The host size should not have grown either
 103                     if [ $host_size_1 -gt $host_size_0 ]; then
 104                         echo "ERROR (create): Host size has grown from $host_size_0 to $host_size_1"
 105                     fi
 106                 fi
 107             fi
 108
 109             # Test resize preallocation: Compare #2 against #1
 110             if [ $growth_mode != off ]; then
 111                 # The image length should not have grown
 112                 if [ $file_length_2 -gt $file_length_1 ]; then
 113                     echo "ERROR (grow): Image length has grown from $file_length_1 to $file_length_2"
 114                 fi
 115                 if [ $create_mode != metadata ]; then
 116                     # The host size should not have grown either
 117                     if [ $host_size_2 -gt $host_size_1 ]; then
 118                         echo "ERROR (grow): Host size has grown from $host_size_1 to $host_size_2"
 119                     fi
 120                 fi
 121             fi
 122
 123             echo
 124         done
 125     done
 126 done
 127 done
 128
 129 # success, all done
 130 echo '*** done'
 131 rm -f $seq.full
 132 status=0