Re: [PATCH 0/1] devpts: Removing the need for pt_chown

[Greg KH]

On Fri, May 06, 2016 at 12:45:01PM -0700, Peter Hurley wrote:
> On 05/06/2016 12:35 PM, Greg KH wrote:
> > On Fri, May 06, 2016 at 02:04:12PM -0500, Eric W. Biederman wrote:
> >>
> >> Greg,
> >>
> >> Could you please apply the following patch to tty-next so it can be
> >> merged into 4.7-rc1.
> >>
> >> We have had a long series of discussions and in the last iteration we
> >> finally converged on a set of semantics that does not break userspace
> >> and also makes the code simpler.
> > 
> > Did everyone agree?  I didn't think so, but the thread got long and
> > messy.  And then Linus did some work on this as well.
> > 
> > How does this play with what Linus proposed?  I think only portions of
> > his original changes are merged, and there are still outstanding parts,
> > right?
> 
> Linus committed his proposed pty changes which sits in -rc6 and not
> in tty-next (which is based on -rc5):
> 
> commit 8ead9dd54716d1e05e129959f702fcc1786f82b4
> Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Date:   Mon Apr 25 20:04:08 2016 -0700
> 
>     devpts: more pty driver interface cleanups
>     
>     This is more prep-work for the upcoming pty changes.  Still just code
>     cleanup with no actual semantic changes.
>     
>     This removes a bunch pointless complexity by just having the slave pty
>     side remember the dentry associated with the devpts slave rather than
>     the inode.  That allows us to remove all the "look up the dentry" code
>     for when we want to remove it again.
> 
>     ....
> 
> 
> Linus's changes look good to me and I've been running them cherry-picked on
> my private tty-next testing tree since.
> 
> When Greg picks up -rc6 (not sure he was going to do that pre-merge window?),
> I'd also like to push the devpts_mutex locking down into fs/devpts/inode.c,
> but I'd be willing to do that later, if it's going to get in the way.

Ah, that's why I missed it, thanks.

It's late in the review cycle here Eric, how about I consider this after
4.7-rc1 is out to make it get more testing and so that others can build
on it (as Peter describes)?

thanks,

greg k-h