md: add a mddev_trace_remap helper
Add a helper to trace bio remapping that hides some argument dereferences and the check for a DM-mapped MD device. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed--by: Song Liu <song@kernel.org> Tested-by: Song Liu <song@kernel.org> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20240303140150.5435-2-hch@lst.de
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