[HEADSUP] Disallowing read() of a directory fd

[Daniel Ebdrup Jensen]

On Fri, May 15, 2020 at 11:47:44AM +0200, Stefan Eßer wrote:
>And I'm convinced that any developer going to work on that part of UFS
>would consider adding debug code to provide or display that information
>(or remove the error return just for local testing) a minor annoyance.
>[SNIP]
>
>Regards, STefan
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They could also add tracepoints for dtrace, and commit them to the tree so 
everyone can use them. :)

Afterall, there's only +82k tracepoints (on FreeBSD 12.1-RELEASE, probably more 
in -CURRENT), so there's clearly room for improvement, especially when you look 
at the distribution with:
dtrace -l | awk '{ print $2 }' | uniq -c | sort -n

Yours,
Daniel Ebdrup Jensen
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