Re: [ANNOUNCE] submount: another removeable media handler

H. Peter Anvin (hpa@zytor.com)
Mon, 19 May 2003 10:10:00 -0700


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

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