Mike Christie wrote:
Block layer defines the max segment size as 65536. We need new block layer helpers to do the mapping. Although one late night I thought I could use a modified blk_rq_map_kern some how. If sg or st allocate the reserve buffers then we could make a
oops, I meant sg or st would allocate the reserves or huge buffers/pages/segments using some block layer helper becuase the block layer knows the segment and size limits a little better. But the sg or st driver would pass in the reserves to the block layer mapping function similar to how we can pass in bio_sets to the bio code.
blk_rq_map_kern_iovec function that worked similar to its user cousin but of course operated on a iovec of kernel buffers. But then I am not sure if at that point we should just be interacting with the bio code directly instead of adding a extra iovec abstraction. I would guess for SCSI drivers at least it is nicer to not worry about bio internals though. James and Jens would konw best though.
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