Messages in this thread | | | Date | Thu, 17 Feb 2000 10:52:34 +0000 (GMT) | From | Riley Williams <> | Subject | Re: Of removable devices |
| |
Hi David.
>>> AmigaOS just polled the line to detect insertions and removals.
>> Wonderful. And how frequent the polling was?
>>> it would mount as another logical volume. Now when there was a >>> need to access the first floppy, the OS popped up a dialog ( a >>> requester, in amiga terminology :-) saying "Insert volume >>> Linux_help_disk into any drive". When the user
>> Ahem... OK, does anyone else see something strange in words "OS >> popped up a dialog"?
> No.
> On a real operating system, the OS would simply notify userland, > which would do whatever it wanted to do.
Fair enough so far. It's from here on that things go wrong.
> A sensible userland might then spit out a dialog telling the > user...
Which user's screen should that dialogue appear on? Remember, the process most likely to access floppies is the one that flushes dirty buffers to disk - `updated` if my memory's correct - and it's unlikely it will have any clue here.
Remember: On a multi-user system like Linux, the user that removed the floppy could easily NOT be the user that was writing to it.
> ...to put the disk in question back into the machine, or it > might ignore the frantic request from the kernel, at which point > the OS would return EYOULOSE to the poor process that tried to > access the no longer existing process.
Same question: WHich user should be notified?
> Think about kerneld/kmod/whatever it is this week.
They have one BIG advantage over the facility under discussion: They do NOT need to interact with any user to do their work.
Best wishes from Riley.
* Copyright (C) 1999, Memory Alpha Systems. * All rights and wrongs reserved.
+----------------------------------------------------------------------+ | There is something frustrating about the quality and speed of Linux | | development, ie., the quality is too high and the speed is too high, | | in other words, I can implement this XXXX feature, but I bet someone | | else has already done so and is just about to release their patch. | +----------------------------------------------------------------------+ * http://www.memalpha.cx/Linux/Kernel/
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |