Re: [RFC, PATCH, RESEND] fs: push rcu_barrier() from deactivate_locked_super() to filesystems

Al Viro
2012-06-08T22:36:28Z

On Fri, Jun 08, 2012 at 03:31:20PM -0700, Andrew Morton wrote:
> On Fri, 8 Jun 2012 23:27:34 +0100
> Al Viro <viro@ZenIV.linux.org.uk> wrote:
>
> > On Fri, Jun 08, 2012 at 03:25:50PM -0700, Andrew Morton wrote:
> >
> > > A neater implementation might be to add a kmem_cache* argument to
> > > unregister_filesystem(). If that is non-NULL, unregister_filesystem()
> > > does the rcu_barrier() and destroys the cache. That way we get to
> > > delete (rather than add) a bunch of code from all filesystems and new
> > > and out-of-tree filesystems cannot forget to perform the rcu_barrier().
> >
> > There's often enough more than one cache, so that one is no-go.
>
> kmem_cache** ;)
>
> Which filesystems have multiple inode caches?

inodes are not the only things that get caches of their own...

BTW, Kirill, would you mind not cross-posting to that many lists ever again?