Re: Linux kernel 2.6.x Raw device support
Ambrose Li <acli@ada.dhs.org> wrote:
> Support for raw block devices is indeed not Linux-specific.
> IIRC, it was an answer to commercial database vendors, who
> insisted at the time that without raw devices, Linux was not
Character devices have been in UNIX long before commercial databases
have been availablr for UNIX.
> number. Personally I imagine that the lack of use of raw
> devices in Linux might have something to do with the strange way
> Linux raw devices work...
Before Linux-2.4, Linux was unable to do USER mode DMA at all.
Implementing RAW devices would have needed equally sized
copy buffers in the kernel.
Jörg
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