Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [ANNOUNCE] udev 0.1 release | Date | Sat, 12 Apr 2003 00:12:43 +0200 |
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On Friday 11 April 2003 23:57, Greg KH wrote:
> No, you want to make sure you have the same "name" after that. As any > userspace apps that had a open file on the original disks are basically > screwed anyway, we want a way to enable them to recover nicely. > > And no, I don't want to go into the whole, remove a device and plug it > back in, and userspace never noticed the difference while it held an > open file handle. That's a problem I don't want to even go near right > now, and is totally different from what udev is trying to do :)
Ok, but that still leaves the race between creation and removal of devices files. In my scenario three different bad things can happen:
- The file is removed after the device is added - The file is added when the device is already unplugged again - The file gets added with the wrong device number -> worst case
This can be avoided by completely serializing all events, both inside the kernel and the execution of /sbin/hotplug, but that might cause significant downtime.
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