tests/qemu-iotests/028

   1 #!/usr/bin/env 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 $seq"
  29
  30 status=1        # failure is the default!
  31
  32 _cleanup()
  33 {
  34     _cleanup_qemu
  35     _rm_test_img "${TEST_IMG}.copy"
  36     _cleanup_test_img
  37 }
  38 trap "_cleanup; exit \$status" 0 1 2 3 15
  39
  40 # get standard environment, filters and checks
  41 . ./common.rc
  42 . ./common.filter
  43 . ./common.pattern
  44 . ./common.qemu
  45
  46 # Any format supporting backing files except vmdk and qcow which do not support
  47 # smaller backing files.
  48 _supported_fmt qcow2 qed
  49 _supported_proto file
  50 _supported_os Linux
  51
  52 # Choose a size that is not necessarily a cluster size multiple for image
  53 # formats that use clusters.  This will ensure that the base image doesn't end
  54 # precisely on a cluster boundary (the easy case).
  55 image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 ))
  56
  57 # The base image is smaller than the image file
  58 base_size=$(( image_size - 1024 * 1024 * 1024 ))
  59
  60 offset=$(( base_size - 32 * 1024 ))
  61
  62 TEST_IMG_SAVE="$TEST_IMG"
  63 TEST_IMG="$TEST_IMG.base"
  64
  65 _make_test_img $base_size
  66
  67 echo "Filling base image"
  68 echo
  69
  70 # Fill end of base image with a pattern, skipping every other sector
  71 io writev $offset 512 1024 32
  72
  73 _check_test_img
  74
  75 echo "Creating test image with backing file"
  76 echo
  77
  78 TEST_IMG="$TEST_IMG_SAVE"
  79 _make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size
  80
  81 echo "Filling test image"
  82 echo
  83
  84 # Write every other sector around where the base image ends
  85 io writev $(( offset + 512 )) 512 1024 64
  86
  87 _check_test_img
  88
  89 echo "Reading"
  90 echo
  91
  92 # Base image sectors
  93 io readv $(( offset )) 512 1024 32
  94
  95 # Image sectors
  96 io readv $(( offset + 512 )) 512 1024 64
  97
  98 # Zero sectors beyond end of base image
  99 io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
 100
 101 _check_test_img
 102
 103 # Rebase it on top of its base image
 104 $QEMU_IMG rebase -b "$TEST_IMG.base" -F $IMGFMT "$TEST_IMG"
 105
 106 echo
 107 echo block-backup
 108 echo
 109
 110 qemu_comm_method="monitor"
 111 _launch_qemu -drive file="${TEST_IMG}",cache=${CACHEMODE},aio=${AIOMODE},id=disk
 112 h=$QEMU_HANDLE
 113 if [ "${VALGRIND_QEMU}" == "y" ]; then
 114     QEMU_COMM_TIMEOUT=7
 115 else
 116     QEMU_COMM_TIMEOUT=1
 117 fi
 118
 119 # Silence output since it contains the disk image path and QEMU's readline
 120 # character echoing makes it very hard to filter the output. Plus, there
 121 # is no telling how many times the command will repeat before succeeding.
 122 # (Note that creating the image results in a "Formatting..." message over
 123 # stdout, which is the same channel the monitor uses.  We cannot reliably
 124 # wait for it because the monitor output may interact with it in such a
 125 # way that _timed_wait_for cannot read it.  However, once the block job is
 126 # done, we know that the "Formatting..." message must have appeared
 127 # already, so the output is still deterministic.)
 128 silent=y _send_qemu_cmd $h "drive_backup disk ${TEST_IMG}.copy" "(qemu)"
 129 silent=y qemu_cmd_repeat=20 _send_qemu_cmd $h "info block-jobs" "No active jobs"
 130 _send_qemu_cmd $h "info block-jobs" "No active jobs"
 131 _send_qemu_cmd $h 'quit' ""
 132
 133 # Base image sectors
 134 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset )) 512 1024 32
 135
 136 # Image sectors
 137 TEST_IMG="${TEST_IMG}.copy" io readv $(( offset + 512 )) 512 1024 64
 138
 139 # Zero sectors beyond end of base image
 140 TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
 141
 142
 143 _check_test_img
 144
 145 # success, all done
 146 echo "*** done"
 147 rm -f $seq.full
 148 status=0