tests/qemu-iotests/175

   1 #!/usr/bin/env bash
   2 #
   3 # Test creating raw image preallocation mode
   4 #
   5 # Copyright (C) 2017 Nir Soffer <nirsof@gmail.com>
   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=nirsof@gmail.com
  23
  24 seq=`basename $0`
  25 echo "QA output created by $seq"
  26
  27 status=1        # failure is the default!
  28
  29 _cleanup()
  30 {
  31     _cleanup_test_img
  32     rm -f "$TEST_DIR/empty"
  33 }
  34 trap "_cleanup; exit \$status" 0 1 2 3 15
  35
  36 # Some file systems sometimes allocate extra blocks independently of
  37 # the file size.  This function hides the resulting difference in the
  38 # stat -c '%b' output.
  39 # Parameter 1: Number of blocks an empty file occupies
  40 # Parameter 2: Minimal number of blocks in an image
  41 # Parameter 3: Image size in bytes
  42 _filter_blocks()
  43 {
  44     extra_blocks=$1
  45     min_blocks=$2
  46     img_size=$3
  47
  48     sed -e "s/blocks=$min_blocks\\(\$\\|[^0-9]\\)/min allocation/" \
  49         -e "s/blocks=$((extra_blocks + img_size / 512))\\(\$\\|[^0-9]\\)/max allocation/"
  50 }
  51
  52 # Resize image using block_resize.
  53 # Parameter 1: image path
  54 # Parameter 2: new size
  55 _block_resize()
  56 {
  57     local path=$1
  58     local size=$2
  59
  60     $QEMU -qmp stdio -nographic -nodefaults \
  61         -blockdev file,node-name=file,filename=$path,cache.direct=on \
  62         <<EOF
  63 {'execute': 'qmp_capabilities'}
  64 {'execute': 'block_resize', 'arguments': {'node-name': 'file', 'size': $size}}
  65 {'execute': 'quit'}
  66 EOF
  67 }
  68
  69 # get standard environment, filters and checks
  70 . ./common.rc
  71 . ./common.filter
  72
  73 _supported_fmt raw
  74 _supported_proto file
  75 _supported_os Linux
  76
  77 _default_cache_mode none
  78 _supported_cache_modes none directsync
  79
  80 size=$((1 * 1024 * 1024))
  81
  82 touch "$TEST_DIR/empty"
  83 extra_blocks=$(stat -c '%b' "$TEST_DIR/empty")
  84
  85 # We always write the first byte; check how many blocks this filesystem
  86 # allocates to match empty image alloation.
  87 printf "\0" > "$TEST_DIR/empty"
  88 min_blocks=$(stat -c '%b' "$TEST_DIR/empty")
  89
  90 echo
  91 echo "== creating image with default preallocation =="
  92 _make_test_img -o extent_size_hint=0 $size | _filter_imgfmt
  93 stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
  94
  95 for mode in off full falloc; do
  96     echo
  97     echo "== creating image with preallocation $mode =="
  98     _make_test_img -o preallocation=$mode,extent_size_hint=0 $size | _filter_imgfmt
  99     stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
 100 done
 101
 102 for new_size in 4096 1048576; do
 103     echo
 104     echo "== resize empty image with block_resize =="
 105     _make_test_img -o extent_size_hint=0 0 | _filter_imgfmt
 106     _block_resize $TEST_IMG $new_size >/dev/null
 107     stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $new_size
 108 done
 109
 110 # success, all done
 111 echo "*** done"
 112 rm -f $seq.full
 113 status=0