Re: devfs_get/set_cdevpriv functions from FreeBSD

[Alex Hornung <ahornung@xxxxxxxxx>]

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On 17/07/12 09:11, Markus Pfeiffer wrote:
> Question is now: Should we have similar functionality (i.e. per 
> open filedescriptor "private" data) and if yes how to best 
> implement that. I know that AlexH had made some suggestion but I 
> cannot find it in the IRC logs and it would probably be more 
> efficient doing this by mail.

My original suggestion, which is straight forward to implement, is to
just store the fp in each of the devfs_fo_* operations somewhere (e.g.
curthread like FreeBSD, although that isn't all that nice), and then
clean it up on devfs_fo_close.

Having that, you can easily implement the rest to set up some list or
tree or whatever inside a  cdev that is also passed to the function.
the search key would then be the fp that you stored somewhere whilst
in devfs_fo_*.

HTH,
Alex
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