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When querying block limits, different cache modes (in particular O_DIRECT or not) can result in different limits. Add an option to 'qemu-img info' that allows the user to specify a cache mode, so that they can get the block limits for the cache mode they intend to use with their VM. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20251024123041.51254-5-kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>