Re: [PATCH] unified SysV and Posix mqueues as FS

[Peter Waechtler]

Manfred Spraul schrieb:
> 
> Peter Waechtler wrote:
> 
> >I plan to separate the interfaces and just share the message stuff.
> >But time was getting short. :)
> >
> 
> Ok, you plan to rewrite the patch entirely, and what you have posted is
> a placeholder.
> 
> How would the result look like?
> I'm thinking about
> - real syscalls
> - pipefs like filesystem stub, kern-only mounted, not visible for normal
> fs operations.
> - not using the sysv array
> 
> Could you check the sus standard if that is permitted? A child would
> inherit the mqueue on fork().
> 

Yes, I will check that - but I'm afraid of submitting too late.. :(

> For the locking stuff, the patch should probably depend on the sysv rcu
> patch, it cleans up locking a bit.
> 

BTW, please have a look at ipc/util.c - the spinlock is held once
ipc_addid() is called and will deadlock when the array has to grow...