good sharing.   following up on your comments:

in the kernel source:

block/*.c are the files for block I/O related stuff - the layer just before
ATA, implementing stuff like elevator I/O etc.
drivers/block/*.c:  hardware-specific files that understand how to talk to
each type of harddisk.
drivers/scsi/*.c:   generally SCSI protocol related stuff (lib*.c), but may
contain device specific stuff.
drivers/ide/*.c:
drivers/ata/*.c:   among the lowest level just before sending out port I/O
operation.

On Fri, Feb 8, 2013 at 8:26 AM, [off-list ref] wrote:

On Fri, 08 Feb 2013 07:48:39 +0800, Peter Teoh said:

quoted

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...

-- 
Regards,
Peter Teoh
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