[RFC][PATCH 0/8][v2]: Enable multiple mounts of devpts

Eric W. Biederman ebiederm at xmission.com
Thu Aug 21 10:45:07 PDT 2008

Cedric Le Goater <clg at fr.ibm.com> writes:

> H. Peter Anvin wrote:
>> Cedric Le Goater wrote:
>>>> I suggest "newinstance", but "newns" works, too.
>>> Could we also use this mount option to 'unshare' a new posix message
>>> queue namespace ?
>> Sorry, I fail to see the connection with devpts here?  Are you
>> suggesting using the same option for another filesystem (if so, which)?
> yes. the posix message queues are also using a single superblock filesystem. 
> If we want isolate them (for container needs for example), we also need to 
> create a new sb. The patchset I have uses a clone flag but using a mount 
> 'newns' really sounds like a better idea.

Let's call it newinstance if we are going to use the same option for devpts.

We can update "current->nsproxy->mqueuens" when the newinstance flag is passed
and otherwise we can mount whatever is the current mqueue filesystem for
the process.

That should be simple and just work.


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