tests/qemu-iotests/309

   1 #!/usr/bin/env bash
   2 #
   3 # Test qemu-nbd -A
   4 #
   5 # Copyright (C) 2018-2020 Red Hat, Inc.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20
  21 seq="$(basename $0)"
  22 echo "QA output created by $seq"
  23
  24 status=1 # failure is the default!
  25
  26 _cleanup()
  27 {
  28     _cleanup_test_img
  29     nbd_server_stop
  30 }
  31 trap "_cleanup; exit \$status" 0 1 2 3 15
  32
  33 # get standard environment, filters and checks
  34 . ./common.rc
  35 . ./common.filter
  36 . ./common.nbd
  37
  38 _supported_fmt qcow2
  39 _supported_proto file
  40 _supported_os Linux
  41 _require_command QEMU_NBD
  42
  43 echo
  44 echo "=== Initial image setup ==="
  45 echo
  46
  47 TEST_IMG="$TEST_IMG.base" _make_test_img 4M
  48 $QEMU_IO -c 'w 0 2M' -f $IMGFMT "$TEST_IMG.base" | _filter_qemu_io
  49 _make_test_img -b "$TEST_IMG.base" -F $IMGFMT 4M
  50 $QEMU_IO -c 'w 1M 2M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io
  51
  52 echo
  53 echo "=== Check allocation over NBD ==="
  54 echo
  55
  56 $QEMU_IMG map --output=json -f qcow2 "$TEST_IMG"
  57 IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket"
  58 nbd_server_start_unix_socket -r -f qcow2 -A "$TEST_IMG"
  59 # Normal -f raw NBD block status loses access to allocation information
  60 $QEMU_IMG map --output=json --image-opts \
  61     "$IMG" | _filter_qemu_img_map
  62 # But when we use -A, coupled with x-dirty-bitmap in the client for feeding
  63 # 2-bit block status from an alternative NBD metadata context (note that
  64 # the client code for x-dirty-bitmap intentionally collapses all depths
  65 # beyond 2 into a single value), we can determine:
  66 #    unallocated (depth 0) => "zero":false, "data":true
  67 #    local (depth 1)       => "zero":false, "data":false
  68 #    backing (depth 2+)    => "zero":true,  "data":true
  69 $QEMU_IMG map --output=json --image-opts \
  70     "$IMG,x-dirty-bitmap=qemu:allocation-depth" | _filter_qemu_img_map
  71 # More accurate results can be obtained by other NBD clients such as
  72 # libnbd, but this test works without such external dependencies.
  73
  74 # success, all done
  75 echo '*** done'
  76 rm -f $seq.full
  77 status=0