[PATCH] bsg: update sg_io_v4 structure

This updates sg_io_v4 structure (based on Doug's RFC, release 1.3). The major changes are: - add dout_resid field - increase tag size to 64 bits to comply with SAM-4 and SRP - add dout_iovec_count and din_iovec_count dout_iovec_count and din_iovec_count aren't supported now. I'm not sure

[PATCH] bsg: update sg_io_v4 structure

This updates sg_io_v4 structure (based on Doug's RFC, release 1.3). One minor change I made is using 'spare_out' and 'padding' instead of 'spare_out' and 'spare_out2' to be consistent with 'spare_in'. I added dout_iovec_count and din_iovec_count though I'm not sure bsg needs to implement iovec