helpers: add DMA sg mapping helpers
Mapping zio_block to a scatterlist is a common operations. This patch simply adds a set of helpers to manage the scatter DMA mapping. Signed-off-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Alessandro Rubini <rubini@gnudd.com>
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dma.c
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include/linux/zio-dma.h
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