[PATCH] finally, sgio updates

Lots of stuff here... Basically we are using all that flashy
infrastructure I sent you to allow DMA for ATAPI at a 4-byte
granularity. So we can burns audio cds with zero-copy dma, and all that
cool stuff.

o Use bio_map_user(), fallback to kmalloc approach if it fails

o Use per-queue timeouts

o Check for right sg version, we can add old type support too later.

o Support SCSI_IOCTL_SEND_COMMAND old crap

o Check for size of command

o Make cdrom eject work

Etc...