Re: [patch -mm 2/4] mqueue namespace : add unshare support

[Oren Laadan <orenl@cs.columbia.edu>]

Cedric Le Goater wrote:
>>> Index: 2.6.24-rc3-mm2/include/linux/sched.h
>>> ===================================================================
>>> --- 2.6.24-rc3-mm2.orig/include/linux/sched.h
>>> +++ 2.6.24-rc3-mm2/include/linux/sched.h
>>> @@ -27,6 +27,7 @@
>>>  #define CLONE_NEWUSER		0x10000000	/* New user namespace */
>>>  #define CLONE_NEWPID		0x20000000	/* New pid namespace */
>>>  #define CLONE_NEWNET		0x40000000	/* New network namespace */
>>> +#define CLONE_NEWMQ		0x80000000	/* New posix mqueue namespace */
>> That's it :) We've run out of clone flags on 32-bit platforms :(
> 
> yes. 
> 
> I have been giving some thoughts to a clone2() to extend the flags but
> andrew is preparing to recycle CLONE_DETACHED and CLONE_STOPPED for
> 2.6.26. Some we might have some more time in front of us.

Two comments:

1) Does it ever make any sense to clone the IPC namespace *without* doing
so also for the MQ namespace or vice versa ?  Unless there is a good
reason for doing so, a single CLONE_IPCMQ flag would suffice.

2) Before coming up with a new clone2() or other solution, what about the
proposed (and debated) sys_indrect() -- if it gets merged it can provide
the solution.

Oren.

> 
> C.
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