Re: Kernel patch to better support bind-mounts

[Peter Staubach <staubach@redhat.com>]

Ian Kent wrote:
> On Tue, 2008-03-04 at 08:25 -0500, Peter Staubach wrote:
>   
>> Lukas Kolbe wrote:
>>     
>>> Hi Ian!
>>>
>>> Ping? :)
>>>
>>> We use this patch now for several servers and clients (debian etch with
>>> 2.6.18, ubuntu feisty with 2.6.20 and some test systems with 2.6.23),
>>> and have seen no regression so far, only working automounts :)
>>> I'd love to see this change upstream, so that I don't have to worry
>>> about constantly patching my own kernel anymore :)
>>>       
>> Why does adding mount on access(2) make things work better?  What works 
>> better?
>>     
>
> Lucas has recursive maps.
> For these mounts to work, we need to ensure that there aren't dependent
> mounts in the mount point path itself before proceeding. We've used the
> access system call, made just prior to performing the mount, to make
> this happen. In this case, however, the lookup flags in the kernel where
> not triggering the mount.

And this does not trigger mounts by other applications, such as ls, too?

    Thanx...

       ps