qemu-iotests: Fix supported cache modes for 052
The requirement for this test case is really "no O_DIRECT", because the
temporary snapshot for BDRV_O_SNAPSHOT is created in /tmp, which often
is a tmpfs.
Commit f210a83c ('qemu-iotests: Add _default_cache_mode and
_supported_cache_modes') turned the restriction into writethrough-only,
but that's not really necessary.
Allow to run the test for any non-O_DIRECT cache modes, and use the
global default of writeback if no cache mode is specified.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1412076430-11623-3-git-send-email-kwolf@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
			
			
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				@ -41,8 +41,9 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
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_supported_fmt generic
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					_supported_fmt generic
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_supported_proto file
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					_supported_proto file
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_supported_os Linux
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					_supported_os Linux
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_default_cache_mode "writethrough"
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_supported_cache_modes "writethrough"
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					# Don't do O_DIRECT on tmpfs
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					_supported_cache_modes "writeback" "writethrough" "unsafe"
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size=128M
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					size=128M
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_make_test_img $size
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					_make_test_img $size
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