Re: What to do about the 2TB limit on HDIO_GETGEO ?

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H. Peter Anvin wrote:
Mark Lord wrote:

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.
..

Yeah, that would be just as good, really.  Maybe even better.

Mark Lord wrote (later on):
Instead, software has to search everything inside /sys/block/
looking for a "dev" file whose contents match,
rather than just trying to access something like this:

  /sys/block/8:1/start
or
  /sys/block/majors/8/minors/1/start

Or any one of a number of similar ways to arrange it.
..

Greg ?
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