What about a zero-copy read-interface? An ioctl (or something) which enables the kernel to do dma directly to the userspace. Of course this should be limited to the root-user or a user with special capabilities (rights) since if a drive screws up, data from a different sector (or so) might end up in the proces' memory. Of course copying a sector from kernel- to userspace can be done pretty fast but i.m.h.o. all possible speedimprovements should be made unless unclean.
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