On Tue, Jul 17, 2012 at 08:11:13AM +0000, Markus Pfeiffer wrote: > > while porting drivers from FreeBSD some of us have stumbled over the functions > devfs_get_cdevpriv and devfs_set_cdevpriv, which store some > per-open-filedescriptor information for some devices. > > I looked into the FreeBSD code and the implementation seems weird to me since > they store the filedescriptor on syscall in their thread struct and the > functions > rely on that hidden state. > > Question is now: Should we have similar functionality (i.e. per open > filedescriptor "private" data) and if yes how to best implement that.
Have a look at our existing drm infrastructure; there is already some code doing this (a direct replacement of the FreeBSD version). -- Francois Tigeot
