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The old 'cache' option really encodes three different boolean flags into a cache mode name, without providing all combinations. Make them three separate options instead and translate the old option to the new ones for drive_init(). The specific boolean options take precedence if the old cache option is specified as well, so the following options are equivalent: -drive file=x,cache=none,cache.no-flush=true -drive file=x,cache.writeback=true,cache.direct=true,cache.no-flush=true Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
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