Re: mount notification question

[Daniel Lezcano]

On 08/06/2010 09:44 AM, Kay Sievers wrote:
> On Fri, Aug 6, 2010 at 03:07, Daniel Lezcano<daniel.lezcano@xxxxxxx>  wrote:
>    
> > On 08/04/2010 08:41 PM, Chris Friesen wrote:
> >      
> > > On 08/02/2010 03:12 PM, Daniel Lezcano wrote:
> > >        
> > > > is there a way to be notified when a mount occurs on the system ?
> > > >          
> > > Have you looked on google?  The link is a bit misleading but they do
> > > give a way to do it (not using inotify).
> > >
> > > http://stackoverflow.com/questions/1113176/how-could-i-detect-when-a-directory-is-mounted-with-inotify
> > >        
> > Thanks a lot for the pointer. I am not sure this solution will work, because
> > it is inadequate for watching a specific location in a container context
> > separated by the mount and the network namespaces. We have multiple mount
> > points at the same place (eg. the mount point inheritance, the container
> > configuration and the init scripts may mount /dev or /var/run several time)
> > and the network namespace separation will make impossible to watch udev
> > event via a netlink socket. I didn't look at the inotify implementation but
> > IMHO, it should be worth to add IN_MOUNT and IN_UNMOUNT events for inotify
> > no ?
> >      
> These events wouldn't work, and they are long removed from the kernel
> and don't exist.
>
> You need to poll() /proc/mounts, and any changes in it will wake you
> up with POLL_ERR. /proc/mounts should be namespace aware.
>    

Ah, great ! I will look for this solution (I suppose I will probably 
have to diff /proc/mounts but anyway ...)

Thanks Kay and Chris for your help.

  -- Daniel

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