tests/qemu-iotests/tests/file-io-error

   1 #!/usr/bin/env bash
   2 # group: rw
   3 #
   4 # Produce an I/O error in file-posix, and hope that it is not catastrophic.
   5 # Regression test for: https://bugzilla.redhat.com/show_bug.cgi?id=2234374
   6 #
   7 # Copyright (C) 2023 Red Hat, Inc.
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22
  23 seq=$(basename "$0")
  24 echo "QA output created by $seq"
  25
  26 status=1        # failure is the default!
  27
  28 _cleanup()
  29 {
  30     _cleanup_qemu
  31     rm -f "$TEST_DIR/fuse-export"
  32 }
  33 trap "_cleanup; exit \$status" 0 1 2 3 15
  34
  35 # get standard environment, filters and checks
  36 . ../common.rc
  37 . ../common.filter
  38 . ../common.qemu
  39
  40 # Format-agnostic (we do not use any), but we do test the file protocol
  41 _supported_proto file
  42 _require_drivers blkdebug null-co
  43
  44 if [ "$IMGOPTSSYNTAX" = "true" ]; then
  45     # We need `$QEMU_IO -f file` to work; IMGOPTSSYNTAX uses --image-opts,
  46     # breaking -f.
  47     _unsupported_fmt $IMGFMT
  48 fi
  49
  50 # This is a regression test of a bug in which flie-posix would access zone
  51 # information in case of an I/O error even when there is no zone information,
  52 # resulting in a division by zero.
  53 # To reproduce the problem, we need to trigger an I/O error inside of
  54 # file-posix, which can be done (rootless) by providing a FUSE export that
  55 # presents only errors when accessed.
  56
  57 _launch_qemu
  58 _send_qemu_cmd $QEMU_HANDLE \
  59     "{'execute': 'qmp_capabilities'}" \
  60     'return'
  61
  62 _send_qemu_cmd $QEMU_HANDLE \
  63     "{'execute': 'blockdev-add',
  64       'arguments': {
  65           'driver': 'blkdebug',
  66           'node-name': 'node0',
  67           'inject-error': [{'event': 'none'}],
  68           'image': {
  69               'driver': 'null-co'
  70           }
  71       }}" \
  72     'return'
  73
  74 # FUSE mountpoint must exist and be a regular file
  75 touch "$TEST_DIR/fuse-export"
  76
  77 # The grep -v to filter fusermount's (benign) error when /etc/fuse.conf does
  78 # not contain user_allow_other and the subsequent check for missing FUSE support
  79 # have both been taken from iotest 308.
  80 output=$(_send_qemu_cmd $QEMU_HANDLE \
  81     "{'execute': 'block-export-add',
  82       'arguments': {
  83           'id': 'exp0',
  84           'type': 'fuse',
  85           'node-name': 'node0',
  86           'mountpoint': '$TEST_DIR/fuse-export',
  87           'writable': true
  88       }}" \
  89     'return' \
  90     | grep -v 'option allow_other only allowed if')
  91
  92 if echo "$output" | grep -q "Parameter 'type' does not accept value 'fuse'"; then
  93     _notrun 'No FUSE support'
  94 fi
  95 echo "$output"
  96
  97 echo
  98 # This should fail, but gracefully, i.e. just print an I/O error, not crash.
  99 $QEMU_IO -f file -c 'write 0 64M' "$TEST_DIR/fuse-export" | _filter_qemu_io
 100 echo
 101
 102 capture_events=BLOCK_EXPORT_DELETED _send_qemu_cmd $QEMU_HANDLE \
 103     "{'execute': 'block-export-del',
 104       'arguments': {'id': 'exp0'}}" \
 105     'return'
 106
 107 _wait_event $QEMU_HANDLE \
 108     'BLOCK_EXPORT_DELETED'
 109
 110 _send_qemu_cmd $QEMU_HANDLE \
 111     "{'execute': 'blockdev-del',
 112       'arguments': {'node-name': 'node0'}}" \
 113     'return'
 114
 115 # success, all done
 116 echo "*** done"
 117 rm -f $seq.full
 118 status=0