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         _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
  45 # Any format supporting backing files except vmdk and qcow which do not support
  46 # smaller backing files.
  47 _supported_fmt qcow2 qed
  48 _supported_proto file
  49 _supported_os Linux
  50
  51 # Choose a size that is not necessarily a cluster size multiple for image
  52 # formats that use clusters.  This will ensure that the base image doesn't end
  53 # precisely on a cluster boundary (the easy case).
  54 image_size=$(( 4 * 1024 * 1024 * 1024 + 3 * 512 ))
  55
  56 # The base image is smaller than the image file
  57 base_size=$(( image_size - 1024 * 1024 * 1024 ))
  58
  59 offset=$(( base_size - 32 * 1024 ))
  60
  61 _make_test_img $base_size
  62
  63 echo "Filling base image"
  64 echo
  65
  66 # Fill end of base image with a pattern, skipping every other sector
  67 io writev $offset 512 1024 32
  68
  69 _check_test_img
  70
  71 echo "Creating test image with backing file"
  72 echo
  73
  74 mv "$TEST_IMG" "$TEST_IMG.base"
  75 _make_test_img -b "$TEST_IMG.base" $image_size
  76
  77 echo "Filling test image"
  78 echo
  79
  80 # Write every other sector around where the base image ends
  81 io writev $(( offset + 512 )) 512 1024 64
  82
  83 _check_test_img
  84
  85 echo "Reading"
  86 echo
  87
  88 # Base image sectors
  89 io readv $(( offset )) 512 1024 32
  90
  91 # Image sectors
  92 io readv $(( offset + 512 )) 512 1024 64
  93
  94 # Zero sectors beyond end of base image
  95 io_zero readv $(( offset + 32 * 1024 )) 512 1024 32
  96
  97 _check_test_img
  98
  99 # Rebase it on top of its base image
 100 $QEMU_IMG rebase -b "$TEST_IMG.base" "$TEST_IMG"
 101
 102 _check_test_img
 103
 104 # success, all done
 105 echo "*** done"
 106 rm -f $seq.full
 107 status=0