tests/qemu-iotests/028

   1 #!/bin/bash
   2 #
   3 # Test that backing files can be smaller than the image
   4 #
   5 # Copyright (C) 2010 IBM, Corp.
   6 #
   7 # Based on 017:
   8 # Copyright (C) 2009 Red Hat, Inc.
   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=stefanha@linux.vnet.ibm.com
  26
  27 seq=`basename $0`
  28 echo "QA output created by $seq"
  29
  30 here=`pwd`
  31 tmp=/tmp/$$
  32 status=1        # failure is the default!
  33
  34 _cleanup()
  35 {
  36     rm -f "${TEST_IMG}.copy"
  37     _cleanup_test_img
  38 }
  39 trap "_cleanup; exit \$status" 0 1 2 3 15
  40
  41 # get standard environment, filters and checks
  42 . ./common.rc
  43 . ./common.filter
  44 . ./common.pattern
  45 . ./common.qemu
  46
  47 # Any format supporting backing files except vmdk and qcow which do not support
  48 # smaller backing files.
  49 _supported_fmt qcow2 qed
  50 _supported_proto file
  51 _supported_os Linux
  52
  53 # Choose a size that is not necessarily a cluster size multiple for image
  54 # formats that use clusters.  This will ensure that the base image doesn't end
  55 # precisely on a cluster boundary (the easy case).
  56 image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 ))
  57
  58 # The base image is smaller than the image file
  59 base_size=$(( image_size - 1024 * 1024 * 1024 ))
  60
  61 offset=$(( base_size - 32 * 1024 ))
  62
  63 TEST_IMG_SAVE="$TEST_IMG"
  64 TEST_IMG="$TEST_IMG.base"
  65
  66 _make_test_img $base_size
  67
  68 echo "Filling base image"
  69 echo
  70
  71 # Fill end of base image with a pattern, skipping every other sector
  72 io writev $offset 512 1024 32
  73
  74 _check_test_img
  75
  76 echo "Creating test image with backing file"
  77 echo
  78
  79 TEST_IMG="$TEST_IMG_SAVE"
  80 _make_test_img -b "$TEST_IMG.base" $image_size
  81
  82 echo "Filling test image"
  83 echo
  84
  85 # Write every other sector around where the base image ends
  86 io writev $(( offset + 512 )) 512 1024 64
  87
  88 _check_test_img
  89
  90 echo "Reading"
  91 echo
  92
  93 # Base image sectors
  94 io readv $(( offset )) 512 1024 32
  95
  96 # Image sectors
  97 io readv $(( offset + 512 )) 512 1024 64
  98
  99 # Zero sectors beyond end of base image
 100 io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
 101
 102 _check_test_img
 103
 104 # Rebase it on top of its base image
 105 $QEMU_IMG rebase -b "$TEST_IMG.base" "$TEST_IMG"
 106
 107 echo
 108 echo block-backup
 109 echo
 110
 111 qemu_comm_method="monitor"
 112 _launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},id=disk
 113 h=$QEMU_HANDLE
 114 QEMU_COMM_TIMEOUT=1
 115
 116 # Silence output since it contains the disk image path and QEMU's readline
 117 # character echoing makes it very hard to filter the output. Plus, there
 118 # is no telling how many times the command will repeat before succeeding.
 119 _send_qemu_cmd $h "drive_backup disk ${TEST_IMG}.copy" "(qemu)" >/dev/null
 120 _send_qemu_cmd $h "" "Formatting" | _filter_img_create
 121 qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs" >/dev/null
 122 _send_qemu_cmd $h "info block-jobs" "No active jobs"
 123 _send_qemu_cmd $h 'quit' ""
 124
 125 # Base image sectors
 126 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32
 127
 128 # Image sectors
 129 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64
 130
 131 # Zero sectors beyond end of base image
 132 TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
 133
 134
 135 _check_test_img
 136
 137 # success, all done
 138 echo "*** done"
 139 rm -f $seq.full
 140 status=0