[inputs/diskio] Fix how major and minor identifiers of block devices are read. #5566
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Soulou
changed the title
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.
Soulou
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Could we use these functions to extract the major/minor numbers? |
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Definitely, I'm doing it now |
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done |
glinton
approved these changes
Mar 15, 2019
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@Soulou could you look into this build error on mipsle? |
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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done :) |
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The current implementation assure that the major and the minor are
coded on one byte. But they are not:
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-290it was overriding
252:34, instead of getting udev stats for252:290.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.