block: Prefix file driver trace points with "file_"
With in one module, trace points usually have a common prefix named after the module name. paio_submit and paio_submit_co are the only two trace points so far in the two file protocol drivers. As we are adding more, having a common prefix here is better so that trace points can be enabled with a glob. Rename them. Suggested-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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