On Thu, Apr 19, 2018 at 01:26:10PM -0400, Jerome Glisse wrote:
> Basicly i want a callback in __fd_install(), do_dup2(), dup_fd() and
> add void * *private_data; to struct fdtable (also a default array to
> struct files_struct). The callback would be part of struct file_operations.
> and only call if it exist (os overhead is only for device driver that
> care).
Hell, *NO*. This is insane - you would need to maintain extra counts
("how many descriptors refer to this struct file... for this descriptor
table").
Besides, _what_ private_data? What would own and maintain it? A specific
driver? What if more than one of them wants that thing?
> Did i miss something fundamental ? copy_files() call dup_fd() so i
> should be all set here.
That looks like an extremely misguided kludge for hell knows what purpose,
almost certainly architecturally insane. What are you actually trying to
achieve?
