Mark Lord wrote:
quoted text
> 
> One candidate might seem to be the existing /sys/block/dev/partition/start
> which I expect is already 64-bit friendly.
> 
> But this requires about 150 lines of somewhat complex C code to access,
> using only the dev_t (from stat(2) on a file) as a starting point,
> or less if one relies upon the udev device name matching the sysfs 
> device name.
> 
> Is it time now for HDIO_GETGEO64 to make an appearance?
> Similar to how the existing BLKGETSIZE64 is supplanting BLKGETSIZE ?
> 

Probably a better thing to have would be a way to look up block devices 
in sysfs by device number.

	-hpa
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