Re: btrfs: stat(2) and /proc/pid/maps returns different devices

[Andrew Vagin <avagin@gmail.com>]

On Wed, Jul 10, 2013 at 10:45:45AM -0700, Mark Fasheh wrote:
> On Wed, Jul 10, 2013 at 09:31:05AM -0700, Mark Fasheh wrote:
> > As far as I can tell we'll be carrying this patch until a better
> > solution is possible.
> > 
> > When that will happen, I don't know.
> > 	--Mark
> 
> Well, what do I get when I pretend I don't care any more? The little voice
> in my head says "keep plugging away". Here's another attempt at fixing this
> problem in a sane manner. Basically, this time we're adding a flag to
> s_flags which btrfs sets. Proc will see the flag and call ->getattr().
> 
> This compiles, but it needs testing (which I will get to soon). It still has
> a bunch of problems in my honest opinion but maybe if we get something
> acceptable upstream we can work from there.
> 
> Also, as Andrew pointed out there's more than one place which is return
> different device than from stat(2) so I probably need to update more sites
> to deal with this.

Yes, we need to fix unix_diag, fanotify fdinfo, ...

> 
> Does anyone see a problem with this approach?

Looks good for me. Thanks.

> 	--Mark
> 
> --
> Mark Fasheh
>