Re: removable media revalidation - udev vs. devfs or static /dev

Andrey Borzenkov
2004-01-07T11:01:36Z

On Wednesday 07 January 2004 12:50, Jens Axboe wrote:
> > > So yeah, poll...
> >
> > Poll how? "kmediachangethread"? Or polling in userland? The latter would
> > (probably) lead to endless IO errors. Not very good.
>
> No need to put it in the kernel, user space fits the bil nicely.

unfortunately opening device in userland effectively locks tray making media
change impossible. at least given current ->open semantic.

even periodic access is quite annoying for users (tray closing while user
attempts to insert CD)

we may agree that O_NDELAY does not affect locked state; currently this is not
consistent across drivers (e.g. cdrom does not lock tray while sd does)