tests/qemu-iotests/250

   1 #!/usr/bin/env bash
   2 # group: rw quick
   3 #
   4 # Test big discard in qcow2 shrink
   5 #
   6 # Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
   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
  23 owner=vsementsov@virtuozzo.com
  24
  25 seq=`basename $0`
  26 echo "QA output created by $seq"
  27
  28 status=1        # failure is the default!
  29
  30 _cleanup()
  31 {
  32     _cleanup_test_img
  33 }
  34 trap "_cleanup; exit \$status" 0 1 2 3 15
  35
  36 # get standard environment, filters and checks
  37 . ./common.rc
  38 . ./common.filter
  39
  40 _supported_fmt qcow2
  41 _supported_proto file fuse
  42 _supported_os Linux
  43 # This test does not make much sense with external data files
  44 _unsupported_imgopts data_file
  45
  46 # This test checks that qcow2_process_discards does not truncate a discard
  47 # request > 2G.
  48 # To reproduce bug we need to overflow int by one sequential discard, so we
  49 # need size > 2G, bigger cluster size (as with default 64k we may have maximum
  50 # of 512M sequential data, corresponding to one L1 entry), and we need some
  51 # data of the beginning of the disk mapped to the end of file to prevent
  52 # bdrv_co_truncate(bs->file) call in qcow2_co_truncate(), which might succeed
  53 # anyway.
  54
  55 disk_usage()
  56 {
  57     du --block-size=1 $1 | awk '{print $1}'
  58 }
  59
  60 size=2100M
  61
  62 _make_test_img -o "cluster_size=1M,preallocation=metadata" $size
  63 $QEMU_IO -c 'discard 0 10M' -c 'discard 2090M 10M' \
  64          -c 'write 2090M 10M' -c 'write 0 10M' "$TEST_IMG" | _filter_qemu_io
  65
  66 # Check that our trick with swapping first and last 10M chunks succeeded.
  67 # Otherwise test may pass even if bdrv_pdiscard() fails in
  68 # qcow2_process_discards()
  69 $QEMU_IMG map "$TEST_IMG" | _filter_testdir
  70
  71 before=$(disk_usage "$TEST_IMG")
  72 $QEMU_IMG resize --shrink "$TEST_IMG" 5M
  73 after=$(disk_usage "$TEST_IMG")
  74
  75 echo "Disk usage delta: $((before - after))"
  76
  77 # success, all done
  78 echo "*** done"
  79 rm -f $seq.full
  80 status=0