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824d7b570b
This adds a set of accessors for the scsi data buffer. This is in preparation for chaining sg lists and bidirectional requests (and possibly, the mid-layer dma mapping). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>