tests/qemu-iotests/309

   1 #!/usr/bin/env bash
   2 # group: rw auto quick
   3 #
   4 # Test qemu-nbd -A
   5 #
   6 # Copyright (C) 2018-2020 Red Hat, Inc.
   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 seq="$(basename $0)"
  23 echo "QA output created by $seq"
  24
  25 status=1 # failure is the default!
  26
  27 _cleanup()
  28 {
  29     _cleanup_test_img
  30     nbd_server_stop
  31 }
  32 trap "_cleanup; exit \$status" 0 1 2 3 15
  33
  34 # get standard environment, filters and checks
  35 . ./common.rc
  36 . ./common.filter
  37 . ./common.nbd
  38
  39 _supported_fmt qcow2
  40 _supported_proto file
  41 _supported_os Linux
  42 _require_command QEMU_NBD
  43
  44 echo
  45 echo "=== Initial image setup ==="
  46 echo
  47
  48 TEST_IMG="$TEST_IMG.base" _make_test_img 4M
  49 $QEMU_IO -c 'w 0 2M' -f $IMGFMT "$TEST_IMG.base" | _filter_qemu_io
  50 _make_test_img -b "$TEST_IMG.base" -F $IMGFMT 4M
  51 $QEMU_IO -c 'w 1M 2M' -f $IMGFMT "$TEST_IMG" | _filter_qemu_io
  52
  53 echo
  54 echo "=== Check allocation over NBD ==="
  55 echo
  56
  57 $QEMU_IMG map --output=json -f qcow2 "$TEST_IMG"
  58 IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket"
  59 nbd_server_start_unix_socket -r -f qcow2 -A "$TEST_IMG"
  60 # Normal -f raw NBD block status loses access to allocation information
  61 $QEMU_IMG map --output=json --image-opts \
  62     "$IMG" | _filter_qemu_img_map
  63 # But when we use -A, coupled with x-dirty-bitmap in the client for feeding
  64 # 2-bit block status from an alternative NBD metadata context (note that
  65 # the client code for x-dirty-bitmap intentionally collapses all depths
  66 # beyond 2 into a single value), we can determine:
  67 #    unallocated (depth 0) => "zero":false, "data":true
  68 #    local (depth 1)       => "zero":false, "data":false
  69 #    backing (depth 2+)    => "zero":true,  "data":true
  70 $QEMU_IMG map --output=json --image-opts \
  71     "$IMG,x-dirty-bitmap=qemu:allocation-depth" | _filter_qemu_img_map
  72 # More accurate results can be obtained by other NBD clients such as
  73 # libnbd, but this test works without such external dependencies.
  74
  75 # success, all done
  76 echo '*** done'
  77 rm -f $seq.full
  78 status=0