Reattach/redetect allways connected umass device - is it possible ?

[Poul-Henning Kamp]

In message <20050329.014602.66168889.imp at bsdimp.com>, "M. Warner Losh" writes:

>Then we'd have to poll every second in a sane way to accomplish that.
>And finding the sane way that doesn't interfere with other bus usage
>may be tricky.
>
>Unless we're going to give events to the actual user (meaning userland
>entities that inform the user in a friendly way), I'd maintain that
>there's no difference between knowing that the media is ejected
>immediately, and the time of next use.  The user experience will be
>the same either way.

The filesystems could get an upcall now when the disk disappears,
but I have not had time to try to implement this sensibly in any
filesystems yet.

>In the short run, however, adding a few checks to critical parts of
>the path, like daopen, would make the user experience much better.

Absolutely, I just get uncomfortable when I see too much "...we can
get away with...", I want us to stay the UNIX that solves problems
the right way.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.