Messages in this thread | | | From | Tvrtko Ursulin <> | Subject | Re: fanotify - overall design before I start sending patches | Date | Wed, 5 Aug 2009 17:46:16 +0100 |
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On Wednesday 05 August 2009 03:05:34 Pavel Machek wrote: > BTW my -@suse.cz address no longer works. pavel@ucw.cz should be ok. > > > If a FAN_ACCESS_PERM or FAN_OPEN_PERM event is received the listener > > must send a response before the 5 second timeout. If no response is > > sent before the 5 second timeout the original operation is allowed. If > > this happens too many times (10 in a row) the fanotify group is evicted > > from the kernel and will not get any new events. Sending a response is > > done using the setsockopt() call with the socket options set to > > FANOTIFY_ACCESS_RESPONSE. The buffer should contain a structure like: > > The timeout part of interface is very ugly. Will fanotify users have > to be realtime/mlocked?
Why do you think it is very ugly?
Just to make sure you haven't missed this - it is not that they have to complete the whole operation before the timeout period (since you mention realtime/mlock I suspect this is what you think?), but _during_ the operation they have to show that they are active by sending something like keep alive messages.
Or you are worried about failing to meet even that on a loaded system? There has to be something like this otherwise hung userspace client would kill the whole system.
Tvrtko
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