Re: mount notification question

From: Daniel Lezcano
Date: Fri Aug 06 2010 - 04:05:22 EST

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).
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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