LXR qemu/tests/qemu-iotests/175

   1#!/usr/bin/env bash
   2# group: quick
   3#
   4# Test creating raw image preallocation mode
   5#
   6# Copyright (C) 2017 Nir Soffer <nirsof@gmail.com>
   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# creator
  23owner=nirsof@gmail.com
  24
  25seq=`basename $0`
  26echo "QA output created by $seq"
  27
  28status=1        # failure is the default!
  29
  30_cleanup()
  31{
  32    _cleanup_test_img
  33    rm -f "$TEST_DIR/empty"
  34}
  35trap "_cleanup; exit \$status" 0 1 2 3 15
  36
  37# Some file systems sometimes allocate extra blocks independently of
  38# the file size.  This function hides the resulting difference in the
  39# stat -c '%b' output.
  40# Parameter 1: Number of blocks an empty file occupies
  41# Parameter 2: Minimal number of blocks in an image
  42# Parameter 3: Image size in bytes
  43_filter_blocks()
  44{
  45    extra_blocks=$1
  46    min_blocks=$2
  47    img_size=$3
  48
  49    sed -e "s/blocks=$min_blocks\\(\$\\|[^0-9]\\)/min allocation/" \
  50        -e "s/blocks=$((extra_blocks + img_size / 512))\\(\$\\|[^0-9]\\)/max allocation/"
  51}
  52
  53# Resize image using block_resize.
  54# Parameter 1: image path
  55# Parameter 2: new size
  56_block_resize()
  57{
  58    local path=$1
  59    local size=$2
  60
  61    $QEMU -qmp stdio -nographic -nodefaults \
  62        -blockdev file,node-name=file,filename=$path,cache.direct=on \
  63        <<EOF
  64{'execute': 'qmp_capabilities'}
  65{'execute': 'block_resize', 'arguments': {'node-name': 'file', 'size': $size}}
  66{'execute': 'quit'}
  67EOF
  68}
  69
  70# get standard environment, filters and checks
  71. ./common.rc
  72. ./common.filter
  73
  74_supported_fmt raw
  75_supported_proto file fuse
  76_supported_os Linux
  77
  78_default_cache_mode none
  79_supported_cache_modes none directsync
  80
  81size=$((1 * 1024 * 1024))
  82
  83touch "$TEST_DIR/empty"
  84extra_blocks=$(stat -c '%b' "$TEST_DIR/empty")
  85
  86# We always write the first byte; check how many blocks this filesystem
  87# allocates to match empty image alloation.
  88printf "\0" > "$TEST_DIR/empty"
  89min_blocks=$(stat -c '%b' "$TEST_DIR/empty")
  90
  91echo
  92echo "== creating image with default preallocation =="
  93_make_test_img -o extent_size_hint=0 $size
  94stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
  95
  96for mode in off full falloc; do
  97    echo
  98    echo "== creating image with preallocation $mode =="
  99    _make_test_img -o preallocation=$mode,extent_size_hint=0 $size
 100    stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
 101done
 102
 103for new_size in 4096 1048576; do
 104    echo
 105    echo "== resize empty image with block_resize =="
 106    _make_test_img -o extent_size_hint=0 0
 107    _block_resize $TEST_IMG $new_size >/dev/null
 108    stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $new_size
 109done
 110
 111# success, all done
 112echo "*** done"
 113rm -f $seq.full
 114status=0
 115