On Fri, 08 Feb 2013 07:48:39 +0800, Peter Teoh said: > So the drivers just literally concatenate these command into a string and > send it over to the device.
The reason that good disk drivers are hard to write is because it isn't *just* literally concatenating the commands - it also has to do memory management (make sure that everybody's data ends up in the right buffers), command queue management, elevator management (if there's multiple I/O requests pending from userspace, what order do we issue them in?), error recovery, power management, and a ton of other stuff...
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