mitter James Bottomley <jejb@mulgrave.il.steeleye.com> 1180214999 -0500

[SCSI] scsi_lib: add scatter/gather data buffer accessors

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>
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