iotests: add 248: test resume mirror after auto pause on ENOSPC

Test that mirror job actually resume on resume command after being
automatically paused on ENOSPC error.

It's a follow-up test for 8d9648cbf3
    "blockjob: fix user pause in block_job_error_action"

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Tested-by: John Snow <jsnow@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/248

@@ -0,0 +1,71 @@
+#!/usr/bin/env python
+#
+# Test resume mirror after auto pause on ENOSPC
+#
+# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import iotests
+from iotests import qemu_img_create, qemu_io, file_path, filter_qmp_testfiles
+
+iotests.verify_image_format(supported_fmts=['qcow2'])
+
+source, target = file_path('source', 'target')
+size = 5 * 1024 * 1024
+limit = 2 * 1024 * 1024
+
+qemu_img_create('-f', iotests.imgfmt, source, str(size))
+qemu_img_create('-f', iotests.imgfmt, target, str(size))
+qemu_io('-c', 'write 0 {}'.format(size), source)
+
+# raw format don't like empty files
+qemu_io('-c', 'write 0 {}'.format(size), target)
+
+vm = iotests.VM().add_drive(source)
+vm.launch()
+
+blockdev_opts = {
+    'driver': iotests.imgfmt,
+    'node-name': 'target',
+    'file': {
+        'driver': 'raw',
+        'size': limit,
+        'file': {
+            'driver': 'file',
+            'filename': target
+        }
+    }
+}
+vm.qmp_log('blockdev-add', filters=[filter_qmp_testfiles], **blockdev_opts)
+
+vm.qmp_log('blockdev-mirror', device='drive0', sync='full', target='target',
+           on_target_error='enospc')
+
+vm.event_wait('JOB_STATUS_CHANGE', timeout=3.0,
+              match={'data': {'status': 'paused'}})
+
+# drop other cached events, to not interfere with further wait for 'running'
+vm.get_qmp_events()
+
+del blockdev_opts['file']['size']
+vm.qmp_log('x-blockdev-reopen', filters=[filter_qmp_testfiles],
+           **blockdev_opts)
+
+vm.qmp_log('block-job-resume', device='drive0')
+vm.event_wait('JOB_STATUS_CHANGE', timeout=1.0,
+              match={'data': {'status': 'running'}})
+
+vm.shutdown()

tests/qemu-iotests/248.out

@@ -0,0 +1,8 @@
+{"execute": "blockdev-add", "arguments": {"driver": "qcow2", "file": {"driver": "raw", "file": {"driver": "file", "filename": "TEST_DIR/PID-target"}, "size": 2097152}, "node-name": "target"}}
+{"return": {}}
+{"execute": "blockdev-mirror", "arguments": {"device": "drive0", "on-target-error": "enospc", "sync": "full", "target": "target"}}
+{"return": {}}
+{"execute": "x-blockdev-reopen", "arguments": {"driver": "qcow2", "file": {"driver": "raw", "file": {"driver": "file", "filename": "TEST_DIR/PID-target"}}, "node-name": "target"}}
+{"return": {}}
+{"execute": "block-job-resume", "arguments": {"device": "drive0"}}
+{"return": {}}

tests/qemu-iotests/group

@@ -246,3 +246,4 @@
 245 rw auto
 246 rw auto quick
 247 rw auto quick
+248 rw auto quick