Daniel Nelson 9ba023fd67
[inputs/diskio] Fix how major and minor identifiers of block devices are read. ( #5566 ) ...
* Fix how major and minor identifiers of block devices are read.
The current implementation assure that the major and the minor are
coded on one byte. But they are not:
```
brw-rw---- 1 root disk 252, 290 Feb 25 11:36 dm-290
```
290 as minor in this example is over 1 byte.
So after wondering why all my devices iops weren't correctly stored,
I found out that several points were added for some disks. For `dm-290`
it was overriding `252:34`, instead of getting udev stats for `252:290`.
The solution is here:
https://sites.uclouvain.be/SystInfo/usr/include/sys/sysmacros.h.html
The implementation is directly taken from this, fixing my bug.
* Use unix.Major/unix.Minor instead of custom implementation
* [diskio] Force type of stat.Rdev uint64 for mipsle compatibility
For most platforms, stat.Rdev is already a uint64 so this is without any effect
for linux,mipsle, unix.Stat_t.Rdev is a uint32, but the way to compute major and minor doesn't change, casting the uint32 has no impact either
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