Re: [ANNOUNCE] submount: another removeable media handler

["H. Peter Anvin" <hpa@zytor.com>]

Andrey Borzenkov wrote:
> 
>>Basically, in my opinion removable media should be handled by insert
>>and removal detection, not by access detection.  Obviously, there are
>>some sticky issues with that in the case where media can be removed
>>without notice (like PC floppies or other manual-eject devices), but
>>overall I think that is the correct approach.
> 
> 
> You are absolutely right. Unfortunately, I am not aware of any general
> way to request device to notify about media insertion/ejection.
> Without such notification the only thing you can do is to poll - and
> this is the same access detection in disguise. With disatvantage
> that polling wastes system resources and is subject to races.
> 

No, that is not correct.  Polling for insertion is different from 
probing from access.  There isn't a *general* way to obtain 
notification, but may devices offer it, so you need to develop a modular 
way to deal with it.

	-hpa