libata: implement HDIO_GET_IDENTITY
'hdparm -I' doesn't work with ATAPI devices and sg_sat is not widely spread yet leaving no easy way to access ATAPI IDENTIFY data. Implement HDIO_GET_IDENTITY such that at least 'hdparm -i' works. Signed-off-by: NTejun Heo <htejun@gmail.com> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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