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* inode.c operations are full-pages based, and not actually true scatter-gather * Lets us use more pages at once upto 512 (from 249) in 64 bit * Brings us much much closer to be able to use exofs's io_state engine from objlayout driver. (Once I decide where to put the common code) After RAID0 patch the outer (input) bio was never used as a bio, but was simply a page carrier into the raid engine. Even in the simple mirror/single-dev arrangement pages info was copied into a second bio. It is now easer to just pass a pages array into the io_state and prepare bio(s) once. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>