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iotests: Test reopening multiple devices at the same time 

This test swaps the images used by two active block devices.

This is now possible thanks to the new ability to run
x-blockdev-reopen on multiple devices at the same time.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210708114709.206487-6-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2021-07-08 13:47:08 +02:00 committed by Kevin Wolf
parent 3908b7a899
commit 246ebc2d6a
2 changed files with 49 additions and 2 deletions
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47
tests/qemu-iotests/245
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@ -649,6 +649,53 @@ class TestBlockdevReopen(iotests.QMPTestCase):
'-c', 'read -P 0x40 0x40008 1',
'-c', 'read -P 0x80 0x40010 1', hd_path[0])
# Swap the disk images of two active block devices
def test_swap_files(self):
# Add hd0 and hd2 (none of them with backing files)
opts0 = hd_opts(0)
result = self.vm.qmp('blockdev-add', conv_keys = False, **opts0)
self.assert_qmp(result, 'return', {})
opts2 = hd_opts(2)
result = self.vm.qmp('blockdev-add', conv_keys = False, **opts2)
self.assert_qmp(result, 'return', {})
# Write different data to both block devices
self.run_qemu_io("hd0", "write -P 0xa0 0 1k")
self.run_qemu_io("hd2", "write -P 0xa2 0 1k")
# Check that the data reads correctly
self.run_qemu_io("hd0", "read -P 0xa0 0 1k")
self.run_qemu_io("hd2", "read -P 0xa2 0 1k")
# It's not possible to make a block device use an image that
# is already being used by the other device.
self.reopen(opts0, {'file': 'hd2-file'},
"Permission conflict on node 'hd2-file': permissions "
"'write, resize' are both required by node 'hd2' (uses "
"node 'hd2-file' as 'file' child) and unshared by node "
"'hd0' (uses node 'hd2-file' as 'file' child).")
self.reopen(opts2, {'file': 'hd0-file'},
"Permission conflict on node 'hd0-file': permissions "
"'write, resize' are both required by node 'hd0' (uses "
"node 'hd0-file' as 'file' child) and unshared by node "
"'hd2' (uses node 'hd0-file' as 'file' child).")
# But we can swap the images if we reopen both devices at the
# same time
opts0['file'] = 'hd2-file'
opts2['file'] = 'hd0-file'
self.reopenMultiple([opts0, opts2])
self.run_qemu_io("hd0", "read -P 0xa2 0 1k")
self.run_qemu_io("hd2", "read -P 0xa0 0 1k")
# And we can of course come back to the original state
opts0['file'] = 'hd0-file'
opts2['file'] = 'hd2-file'
self.reopenMultiple([opts0, opts2])
self.run_qemu_io("hd0", "read -P 0xa0 0 1k")
self.run_qemu_io("hd2", "read -P 0xa2 0 1k")
# Misc reopen tests with different block drivers
@iotests.skip_if_unsupported(['quorum', 'throttle'])
def test_misc_drivers(self):

4
tests/qemu-iotests/245.out
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@ -17,8 +17,8 @@ read 1/1 bytes at offset 262152
read 1/1 bytes at offset 262160
1 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
..............
...............
----------------------------------------------------------------------
Ran 24 tests
Ran 25 tests
OK