Splitting sg chain allocation support from scsi

Hi,

Currently scsi_lib.c does its own sg chain allocation and freeing, as it
was proof of concept. But other drivers may want to take advantage of
that feature as well. These two patches add a lib/scatterlist.c and
moves most of the linux/scatterlist.h big include into that, and adds
helpers for allocating and initializing an sg list.

This adds a new kernel define SG_MAX_SINGLE_ALLOC that sets the boundary
for when sg_alloc_table() will return a chained list, that used to be a
scsi private thing.

The patch still needs a bit of cleaning up and documenting, but it's a
start. Boots and works here.

-- 
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html