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 _make_test_img $base_size
  64
  65 echo "Filling base image"
  66 echo
  67
  68 # Fill end of base image with a pattern, skipping every other sector
  69 io writev $offset 512 1024 32
  70
  71 _check_test_img
  72
  73 echo "Creating test image with backing file"
  74 echo
  75
  76 mv "$TEST_IMG" "$TEST_IMG.base"
  77 _make_test_img -b "$TEST_IMG.base" $image_size
  78
  79 echo "Filling test image"
  80 echo
  81
  82 # Write every other sector around where the base image ends
  83 io writev $(( offset + 512 )) 512 1024 64
  84
  85 _check_test_img
  86
  87 echo "Reading"
  88 echo
  89
  90 # Base image sectors
  91 io readv $(( offset )) 512 1024 32
  92
  93 # Image sectors
  94 io readv $(( offset + 512 )) 512 1024 64
  95
  96 # Zero sectors beyond end of base image
  97 io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
  98
  99 _check_test_img
 100
 101 # Rebase it on top of its base image
 102 $QEMU_IMG rebase -b "$TEST_IMG.base" "$TEST_IMG"
 103
 104 echo
 105 echo block-backup
 106 echo
 107
 108 qemu_comm_method="monitor"
 109 _launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},id=disk
 110 h=$QEMU_HANDLE
 111 QEMU_COMM_TIMEOUT=1
 112
 113 # Silence output since it contains the disk image path and QEMU's readline
 114 # character echoing makes it very hard to filter the output
 115 _send_qemu_cmd $h "drive_backup disk ${TEST_IMG}.copy" "(qemu)" >/dev/null
 116 _send_qemu_cmd $h "" "Formatting" | _filter_img_create
 117 qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs"
 118 _send_qemu_cmd $h 'quit' ""
 119
 120 # Base image sectors
 121 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32
 122
 123 # Image sectors
 124 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64
 125
 126 # Zero sectors beyond end of base image
 127 TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
 128
 129
 130 _check_test_img
 131
 132 # success, all done
 133 echo "*** done"
 134 rm -f $seq.full
 135 status=0