fdclone KPI

[Kostik Belousov]

On Wed, Apr 09, 2008 at 11:25:46AM -0400, John Baldwin wrote:
> On Wednesday 09 April 2008 12:01:44 am Kostik Belousov wrote:
> > On Tue, Apr 08, 2008 at 04:09:30PM -0700, Rick Hunnicutt wrote:
> > > I'm curious if someone can tell me why the fdclone KPI was not included in 
> the 7.0 release?
> > 
> > Because it got no
> > - review;
> > - interest from the driver authors;
> > - agreement that this is the way to go.
> 
> Oof, where is the patch?  I think it is definitely easier for people to use 
> than devfs cloning when all that is needed is per-instance data.  I would use 
> it in the ipmi(4) driver and the nvidia graphics driver would likely prefer 
> it to devfs cloning as well.

http://people.freebsd.org/~kib/misc/fdclone.10.patch
http://people.freebsd.org/~kib/misc/fclone.c

The patch was developed before the struct file becomes lockless. The link
above contains the mechanically updated patch, that was given one
smoke-test run.

fclone.c is the trivial driver that utilizes the new KPI.
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